1 /* 2 * copyright (c) 2001 Fabrice Bellard 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef AVCODEC_AVCODEC_H 22 #define AVCODEC_AVCODEC_H 23 24 /** 25 * @file 26 * @ingroup libavc 27 * Libavcodec external API header 28 */ 29 30 #include <errno.h> 31 #include "libavutil/samplefmt.h" 32 #include "libavutil/avutil.h" 33 #include "libavutil/buffer.h" 34 #include "libavutil/cpu.h" 35 #include "libavutil/channel_layout.h" 36 #include "libavutil/dict.h" 37 #include "libavutil/frame.h" 38 #include "libavutil/log.h" 39 #include "libavutil/pixfmt.h" 40 #include "libavutil/rational.h" 41 42 #include "libavcodec/version.h" 43 /** 44 * @defgroup libavc Encoding/Decoding Library 45 * @{ 46 * 47 * @defgroup lavc_decoding Decoding 48 * @{ 49 * @} 50 * 51 * @defgroup lavc_encoding Encoding 52 * @{ 53 * @} 54 * 55 * @defgroup lavc_codec Codecs 56 * @{ 57 * @defgroup lavc_codec_native Native Codecs 58 * @{ 59 * @} 60 * @defgroup lavc_codec_wrappers External library wrappers 61 * @{ 62 * @} 63 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge 64 * @{ 65 * @} 66 * @} 67 * @defgroup lavc_internal Internal 68 * @{ 69 * @} 70 * @} 71 * 72 */ 73 74 /** 75 * @defgroup lavc_core Core functions/structures. 76 * @ingroup libavc 77 * 78 * Basic definitions, functions for querying libavcodec capabilities, 79 * allocating core structures, etc. 80 * @{ 81 */ 82 83 84 /** 85 * Identify the syntax and semantics of the bitstream. 86 * The principle is roughly: 87 * Two decoders with the same ID can decode the same streams. 88 * Two encoders with the same ID can encode compatible streams. 89 * There may be slight deviations from the principle due to implementation 90 * details. 91 * 92 * If you add a codec ID to this list, add it so that 93 * 1. no value of a existing codec ID changes (that would break ABI), 94 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec. 95 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts. 96 * 97 * After adding new codec IDs, do not forget to add an entry to the codec 98 * descriptor list and bump libavcodec minor version. 99 */ 100 enum AVCodecID { 101 AV_CODEC_ID_NONE, 102 103 /* video codecs */ 104 AV_CODEC_ID_MPEG1VIDEO, 105 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding 106 AV_CODEC_ID_MPEG2VIDEO_XVMC, 107 AV_CODEC_ID_H261, 108 AV_CODEC_ID_H263, 109 AV_CODEC_ID_RV10, 110 AV_CODEC_ID_RV20, 111 AV_CODEC_ID_MJPEG, 112 AV_CODEC_ID_MJPEGB, 113 AV_CODEC_ID_LJPEG, 114 AV_CODEC_ID_SP5X, 115 AV_CODEC_ID_JPEGLS, 116 AV_CODEC_ID_MPEG4, 117 AV_CODEC_ID_RAWVIDEO, 118 AV_CODEC_ID_MSMPEG4V1, 119 AV_CODEC_ID_MSMPEG4V2, 120 AV_CODEC_ID_MSMPEG4V3, 121 AV_CODEC_ID_WMV1, 122 AV_CODEC_ID_WMV2, 123 AV_CODEC_ID_H263P, 124 AV_CODEC_ID_H263I, 125 AV_CODEC_ID_FLV1, 126 AV_CODEC_ID_SVQ1, 127 AV_CODEC_ID_SVQ3, 128 AV_CODEC_ID_DVVIDEO, 129 AV_CODEC_ID_HUFFYUV, 130 AV_CODEC_ID_CYUV, 131 AV_CODEC_ID_H264, 132 AV_CODEC_ID_INDEO3, 133 AV_CODEC_ID_VP3, 134 AV_CODEC_ID_THEORA, 135 AV_CODEC_ID_ASV1, 136 AV_CODEC_ID_ASV2, 137 AV_CODEC_ID_FFV1, 138 AV_CODEC_ID_4XM, 139 AV_CODEC_ID_VCR1, 140 AV_CODEC_ID_CLJR, 141 AV_CODEC_ID_MDEC, 142 AV_CODEC_ID_ROQ, 143 AV_CODEC_ID_INTERPLAY_VIDEO, 144 AV_CODEC_ID_XAN_WC3, 145 AV_CODEC_ID_XAN_WC4, 146 AV_CODEC_ID_RPZA, 147 AV_CODEC_ID_CINEPAK, 148 AV_CODEC_ID_WS_VQA, 149 AV_CODEC_ID_MSRLE, 150 AV_CODEC_ID_MSVIDEO1, 151 AV_CODEC_ID_IDCIN, 152 AV_CODEC_ID_8BPS, 153 AV_CODEC_ID_SMC, 154 AV_CODEC_ID_FLIC, 155 AV_CODEC_ID_TRUEMOTION1, 156 AV_CODEC_ID_VMDVIDEO, 157 AV_CODEC_ID_MSZH, 158 AV_CODEC_ID_ZLIB, 159 AV_CODEC_ID_QTRLE, 160 AV_CODEC_ID_TSCC, 161 AV_CODEC_ID_ULTI, 162 AV_CODEC_ID_QDRAW, 163 AV_CODEC_ID_VIXL, 164 AV_CODEC_ID_QPEG, 165 AV_CODEC_ID_PNG, 166 AV_CODEC_ID_PPM, 167 AV_CODEC_ID_PBM, 168 AV_CODEC_ID_PGM, 169 AV_CODEC_ID_PGMYUV, 170 AV_CODEC_ID_PAM, 171 AV_CODEC_ID_FFVHUFF, 172 AV_CODEC_ID_RV30, 173 AV_CODEC_ID_RV40, 174 AV_CODEC_ID_VC1, 175 AV_CODEC_ID_WMV3, 176 AV_CODEC_ID_LOCO, 177 AV_CODEC_ID_WNV1, 178 AV_CODEC_ID_AASC, 179 AV_CODEC_ID_INDEO2, 180 AV_CODEC_ID_FRAPS, 181 AV_CODEC_ID_TRUEMOTION2, 182 AV_CODEC_ID_BMP, 183 AV_CODEC_ID_CSCD, 184 AV_CODEC_ID_MMVIDEO, 185 AV_CODEC_ID_ZMBV, 186 AV_CODEC_ID_AVS, 187 AV_CODEC_ID_SMACKVIDEO, 188 AV_CODEC_ID_NUV, 189 AV_CODEC_ID_KMVC, 190 AV_CODEC_ID_FLASHSV, 191 AV_CODEC_ID_CAVS, 192 AV_CODEC_ID_JPEG2000, 193 AV_CODEC_ID_VMNC, 194 AV_CODEC_ID_VP5, 195 AV_CODEC_ID_VP6, 196 AV_CODEC_ID_VP6F, 197 AV_CODEC_ID_TARGA, 198 AV_CODEC_ID_DSICINVIDEO, 199 AV_CODEC_ID_TIERTEXSEQVIDEO, 200 AV_CODEC_ID_TIFF, 201 AV_CODEC_ID_GIF, 202 AV_CODEC_ID_DXA, 203 AV_CODEC_ID_DNXHD, 204 AV_CODEC_ID_THP, 205 AV_CODEC_ID_SGI, 206 AV_CODEC_ID_C93, 207 AV_CODEC_ID_BETHSOFTVID, 208 AV_CODEC_ID_PTX, 209 AV_CODEC_ID_TXD, 210 AV_CODEC_ID_VP6A, 211 AV_CODEC_ID_AMV, 212 AV_CODEC_ID_VB, 213 AV_CODEC_ID_PCX, 214 AV_CODEC_ID_SUNRAST, 215 AV_CODEC_ID_INDEO4, 216 AV_CODEC_ID_INDEO5, 217 AV_CODEC_ID_MIMIC, 218 AV_CODEC_ID_RL2, 219 AV_CODEC_ID_ESCAPE124, 220 AV_CODEC_ID_DIRAC, 221 AV_CODEC_ID_BFI, 222 AV_CODEC_ID_CMV, 223 AV_CODEC_ID_MOTIONPIXELS, 224 AV_CODEC_ID_TGV, 225 AV_CODEC_ID_TGQ, 226 AV_CODEC_ID_TQI, 227 AV_CODEC_ID_AURA, 228 AV_CODEC_ID_AURA2, 229 AV_CODEC_ID_V210X, 230 AV_CODEC_ID_TMV, 231 AV_CODEC_ID_V210, 232 AV_CODEC_ID_DPX, 233 AV_CODEC_ID_MAD, 234 AV_CODEC_ID_FRWU, 235 AV_CODEC_ID_FLASHSV2, 236 AV_CODEC_ID_CDGRAPHICS, 237 AV_CODEC_ID_R210, 238 AV_CODEC_ID_ANM, 239 AV_CODEC_ID_BINKVIDEO, 240 AV_CODEC_ID_IFF_ILBM, 241 AV_CODEC_ID_IFF_BYTERUN1, 242 AV_CODEC_ID_KGV1, 243 AV_CODEC_ID_YOP, 244 AV_CODEC_ID_VP8, 245 AV_CODEC_ID_PICTOR, 246 AV_CODEC_ID_ANSI, 247 AV_CODEC_ID_A64_MULTI, 248 AV_CODEC_ID_A64_MULTI5, 249 AV_CODEC_ID_R10K, 250 AV_CODEC_ID_MXPEG, 251 AV_CODEC_ID_LAGARITH, 252 AV_CODEC_ID_PRORES, 253 AV_CODEC_ID_JV, 254 AV_CODEC_ID_DFA, 255 AV_CODEC_ID_WMV3IMAGE, 256 AV_CODEC_ID_VC1IMAGE, 257 AV_CODEC_ID_UTVIDEO, 258 AV_CODEC_ID_BMV_VIDEO, 259 AV_CODEC_ID_VBLE, 260 AV_CODEC_ID_DXTORY, 261 AV_CODEC_ID_V410, 262 AV_CODEC_ID_XWD, 263 AV_CODEC_ID_CDXL, 264 AV_CODEC_ID_XBM, 265 AV_CODEC_ID_ZEROCODEC, 266 AV_CODEC_ID_MSS1, 267 AV_CODEC_ID_MSA1, 268 AV_CODEC_ID_TSCC2, 269 AV_CODEC_ID_MTS2, 270 AV_CODEC_ID_CLLC, 271 AV_CODEC_ID_MSS2, 272 AV_CODEC_ID_VP9, 273 AV_CODEC_ID_AIC, 274 AV_CODEC_ID_ESCAPE130_DEPRECATED, 275 AV_CODEC_ID_G2M_DEPRECATED, 276 277 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'), 278 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'), 279 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'), 280 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'), 281 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'), 282 283 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'), 284 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'), 285 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'), 286 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'), 287 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'), 288 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'), 289 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'), 290 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'), 291 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'), 292 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'), 293 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'), 294 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'), 295 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'), 296 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'), 297 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'), 298 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'), 299 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'), 300 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'), 301 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'), 302 303 /* various PCM "codecs" */ 304 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs 305 AV_CODEC_ID_PCM_S16LE = 0x10000, 306 AV_CODEC_ID_PCM_S16BE, 307 AV_CODEC_ID_PCM_U16LE, 308 AV_CODEC_ID_PCM_U16BE, 309 AV_CODEC_ID_PCM_S8, 310 AV_CODEC_ID_PCM_U8, 311 AV_CODEC_ID_PCM_MULAW, 312 AV_CODEC_ID_PCM_ALAW, 313 AV_CODEC_ID_PCM_S32LE, 314 AV_CODEC_ID_PCM_S32BE, 315 AV_CODEC_ID_PCM_U32LE, 316 AV_CODEC_ID_PCM_U32BE, 317 AV_CODEC_ID_PCM_S24LE, 318 AV_CODEC_ID_PCM_S24BE, 319 AV_CODEC_ID_PCM_U24LE, 320 AV_CODEC_ID_PCM_U24BE, 321 AV_CODEC_ID_PCM_S24DAUD, 322 AV_CODEC_ID_PCM_ZORK, 323 AV_CODEC_ID_PCM_S16LE_PLANAR, 324 AV_CODEC_ID_PCM_DVD, 325 AV_CODEC_ID_PCM_F32BE, 326 AV_CODEC_ID_PCM_F32LE, 327 AV_CODEC_ID_PCM_F64BE, 328 AV_CODEC_ID_PCM_F64LE, 329 AV_CODEC_ID_PCM_BLURAY, 330 AV_CODEC_ID_PCM_LXF, 331 AV_CODEC_ID_S302M, 332 AV_CODEC_ID_PCM_S8_PLANAR, 333 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'), 334 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'), 335 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16), 336 337 /* various ADPCM codecs */ 338 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000, 339 AV_CODEC_ID_ADPCM_IMA_WAV, 340 AV_CODEC_ID_ADPCM_IMA_DK3, 341 AV_CODEC_ID_ADPCM_IMA_DK4, 342 AV_CODEC_ID_ADPCM_IMA_WS, 343 AV_CODEC_ID_ADPCM_IMA_SMJPEG, 344 AV_CODEC_ID_ADPCM_MS, 345 AV_CODEC_ID_ADPCM_4XM, 346 AV_CODEC_ID_ADPCM_XA, 347 AV_CODEC_ID_ADPCM_ADX, 348 AV_CODEC_ID_ADPCM_EA, 349 AV_CODEC_ID_ADPCM_G726, 350 AV_CODEC_ID_ADPCM_CT, 351 AV_CODEC_ID_ADPCM_SWF, 352 AV_CODEC_ID_ADPCM_YAMAHA, 353 AV_CODEC_ID_ADPCM_SBPRO_4, 354 AV_CODEC_ID_ADPCM_SBPRO_3, 355 AV_CODEC_ID_ADPCM_SBPRO_2, 356 AV_CODEC_ID_ADPCM_THP, 357 AV_CODEC_ID_ADPCM_IMA_AMV, 358 AV_CODEC_ID_ADPCM_EA_R1, 359 AV_CODEC_ID_ADPCM_EA_R3, 360 AV_CODEC_ID_ADPCM_EA_R2, 361 AV_CODEC_ID_ADPCM_IMA_EA_SEAD, 362 AV_CODEC_ID_ADPCM_IMA_EA_EACS, 363 AV_CODEC_ID_ADPCM_EA_XAS, 364 AV_CODEC_ID_ADPCM_EA_MAXIS_XA, 365 AV_CODEC_ID_ADPCM_IMA_ISS, 366 AV_CODEC_ID_ADPCM_G722, 367 AV_CODEC_ID_ADPCM_IMA_APC, 368 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'), 369 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '), 370 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '), 371 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '), 372 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '), 373 374 /* AMR */ 375 AV_CODEC_ID_AMR_NB = 0x12000, 376 AV_CODEC_ID_AMR_WB, 377 378 /* RealAudio codecs*/ 379 AV_CODEC_ID_RA_144 = 0x13000, 380 AV_CODEC_ID_RA_288, 381 382 /* various DPCM codecs */ 383 AV_CODEC_ID_ROQ_DPCM = 0x14000, 384 AV_CODEC_ID_INTERPLAY_DPCM, 385 AV_CODEC_ID_XAN_DPCM, 386 AV_CODEC_ID_SOL_DPCM, 387 388 /* audio codecs */ 389 AV_CODEC_ID_MP2 = 0x15000, 390 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3 391 AV_CODEC_ID_AAC, 392 AV_CODEC_ID_AC3, 393 AV_CODEC_ID_DTS, 394 AV_CODEC_ID_VORBIS, 395 AV_CODEC_ID_DVAUDIO, 396 AV_CODEC_ID_WMAV1, 397 AV_CODEC_ID_WMAV2, 398 AV_CODEC_ID_MACE3, 399 AV_CODEC_ID_MACE6, 400 AV_CODEC_ID_VMDAUDIO, 401 AV_CODEC_ID_FLAC, 402 AV_CODEC_ID_MP3ADU, 403 AV_CODEC_ID_MP3ON4, 404 AV_CODEC_ID_SHORTEN, 405 AV_CODEC_ID_ALAC, 406 AV_CODEC_ID_WESTWOOD_SND1, 407 AV_CODEC_ID_GSM, ///< as in Berlin toast format 408 AV_CODEC_ID_QDM2, 409 AV_CODEC_ID_COOK, 410 AV_CODEC_ID_TRUESPEECH, 411 AV_CODEC_ID_TTA, 412 AV_CODEC_ID_SMACKAUDIO, 413 AV_CODEC_ID_QCELP, 414 AV_CODEC_ID_WAVPACK, 415 AV_CODEC_ID_DSICINAUDIO, 416 AV_CODEC_ID_IMC, 417 AV_CODEC_ID_MUSEPACK7, 418 AV_CODEC_ID_MLP, 419 AV_CODEC_ID_GSM_MS, /* as found in WAV */ 420 AV_CODEC_ID_ATRAC3, 421 AV_CODEC_ID_VOXWARE, 422 AV_CODEC_ID_APE, 423 AV_CODEC_ID_NELLYMOSER, 424 AV_CODEC_ID_MUSEPACK8, 425 AV_CODEC_ID_SPEEX, 426 AV_CODEC_ID_WMAVOICE, 427 AV_CODEC_ID_WMAPRO, 428 AV_CODEC_ID_WMALOSSLESS, 429 AV_CODEC_ID_ATRAC3P, 430 AV_CODEC_ID_EAC3, 431 AV_CODEC_ID_SIPR, 432 AV_CODEC_ID_MP1, 433 AV_CODEC_ID_TWINVQ, 434 AV_CODEC_ID_TRUEHD, 435 AV_CODEC_ID_MP4ALS, 436 AV_CODEC_ID_ATRAC1, 437 AV_CODEC_ID_BINKAUDIO_RDFT, 438 AV_CODEC_ID_BINKAUDIO_DCT, 439 AV_CODEC_ID_AAC_LATM, 440 AV_CODEC_ID_QDMC, 441 AV_CODEC_ID_CELT, 442 AV_CODEC_ID_G723_1, 443 AV_CODEC_ID_G729, 444 AV_CODEC_ID_8SVX_EXP, 445 AV_CODEC_ID_8SVX_FIB, 446 AV_CODEC_ID_BMV_AUDIO, 447 AV_CODEC_ID_RALF, 448 AV_CODEC_ID_IAC, 449 AV_CODEC_ID_ILBC, 450 AV_CODEC_ID_OPUS_DEPRECATED, 451 AV_CODEC_ID_COMFORT_NOISE, 452 AV_CODEC_ID_TAK_DEPRECATED, 453 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'), 454 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'), 455 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'), 456 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'), 457 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'), 458 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'), 459 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'), 460 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'), 461 462 /* subtitle codecs */ 463 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs. 464 AV_CODEC_ID_DVD_SUBTITLE = 0x17000, 465 AV_CODEC_ID_DVB_SUBTITLE, 466 AV_CODEC_ID_TEXT, ///< raw UTF-8 text 467 AV_CODEC_ID_XSUB, 468 AV_CODEC_ID_SSA, 469 AV_CODEC_ID_MOV_TEXT, 470 AV_CODEC_ID_HDMV_PGS_SUBTITLE, 471 AV_CODEC_ID_DVB_TELETEXT, 472 AV_CODEC_ID_SRT, 473 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'), 474 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'), 475 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'), 476 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'), 477 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'), 478 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'), 479 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'), 480 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'), 481 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'), 482 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'), 483 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'), 484 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'), 485 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska 486 487 /* other specific kind of codecs (generally used for attachments) */ 488 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs. 489 AV_CODEC_ID_TTF = 0x18000, 490 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'), 491 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'), 492 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'), 493 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'), 494 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'), 495 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'), 496 497 498 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it 499 500 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS 501 * stream (only used by libavformat) */ 502 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems 503 * stream (only used by libavformat) */ 504 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information. 505 506 #if FF_API_CODEC_ID 507 #include "old_codec_ids.h" 508 #endif 509 }; 510 511 /** 512 * This struct describes the properties of a single codec described by an 513 * AVCodecID. 514 * @see avcodec_get_descriptor() 515 */ 516 typedef struct AVCodecDescriptor { 517 enum AVCodecID id; 518 enum AVMediaType type; 519 /** 520 * Name of the codec described by this descriptor. It is non-empty and 521 * unique for each codec descriptor. It should contain alphanumeric 522 * characters and '_' only. 523 */ 524 const char *name; 525 /** 526 * A more descriptive name for this codec. May be NULL. 527 */ 528 const char *long_name; 529 /** 530 * Codec properties, a combination of AV_CODEC_PROP_* flags. 531 */ 532 int props; 533 } AVCodecDescriptor; 534 535 /** 536 * Codec uses only intra compression. 537 * Video codecs only. 538 */ 539 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0) 540 /** 541 * Codec supports lossy compression. Audio and video codecs only. 542 * @note a codec may support both lossy and lossless 543 * compression modes 544 */ 545 #define AV_CODEC_PROP_LOSSY (1 << 1) 546 /** 547 * Codec supports lossless compression. Audio and video codecs only. 548 */ 549 #define AV_CODEC_PROP_LOSSLESS (1 << 2) 550 /** 551 * Subtitle codec is bitmap based 552 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field. 553 */ 554 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16) 555 /** 556 * Subtitle codec is text based. 557 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field. 558 */ 559 #define AV_CODEC_PROP_TEXT_SUB (1 << 17) 560 561 /** 562 * @ingroup lavc_decoding 563 * Required number of additionally allocated bytes at the end of the input bitstream for decoding. 564 * This is mainly needed because some optimized bitstream readers read 565 * 32 or 64 bit at once and could read over the end.<br> 566 * Note: If the first 23 bits of the additional bytes are not 0, then damaged 567 * MPEG bitstreams could cause overread and segfault. 568 */ 569 #define FF_INPUT_BUFFER_PADDING_SIZE 16 570 571 /** 572 * @ingroup lavc_encoding 573 * minimum encoding buffer size 574 * Used to avoid some checks during header writing. 575 */ 576 #define FF_MIN_BUFFER_SIZE 16384 577 578 579 /** 580 * @ingroup lavc_encoding 581 * motion estimation type. 582 */ 583 enum Motion_Est_ID { 584 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed 585 ME_FULL, 586 ME_LOG, 587 ME_PHODS, 588 ME_EPZS, ///< enhanced predictive zonal search 589 ME_X1, ///< reserved for experiments 590 ME_HEX, ///< hexagon based search 591 ME_UMH, ///< uneven multi-hexagon search 592 ME_TESA, ///< transformed exhaustive search algorithm 593 ME_ITER=50, ///< iterative search 594 }; 595 596 /** 597 * @ingroup lavc_decoding 598 */ 599 enum AVDiscard{ 600 /* We leave some space between them for extensions (drop some 601 * keyframes for intra-only or drop just some bidir frames). */ 602 AVDISCARD_NONE =-16, ///< discard nothing 603 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi 604 AVDISCARD_NONREF = 8, ///< discard all non reference 605 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames 606 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes 607 AVDISCARD_ALL = 48, ///< discard all 608 }; 609 610 enum AVColorPrimaries{ 611 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B 612 AVCOL_PRI_UNSPECIFIED = 2, 613 AVCOL_PRI_BT470M = 4, 614 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM 615 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC 616 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above 617 AVCOL_PRI_FILM = 8, 618 AVCOL_PRI_NB , ///< Not part of ABI 619 }; 620 621 enum AVColorTransferCharacteristic{ 622 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361 623 AVCOL_TRC_UNSPECIFIED = 2, 624 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM 625 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG 626 AVCOL_TRC_SMPTE240M = 7, 627 AVCOL_TRC_NB , ///< Not part of ABI 628 }; 629 630 enum AVColorSpace{ 631 AVCOL_SPC_RGB = 0, 632 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B 633 AVCOL_SPC_UNSPECIFIED = 2, 634 AVCOL_SPC_FCC = 4, 635 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601 636 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above 637 AVCOL_SPC_SMPTE240M = 7, 638 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16 639 AVCOL_SPC_NB , ///< Not part of ABI 640 }; 641 #define AVCOL_SPC_YCGCO AVCOL_SPC_YCOCG 642 643 enum AVColorRange{ 644 AVCOL_RANGE_UNSPECIFIED = 0, 645 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges 646 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges 647 AVCOL_RANGE_NB , ///< Not part of ABI 648 }; 649 650 /** 651 * X X 3 4 X X are luma samples, 652 * 1 2 1-6 are possible chroma positions 653 * X X 5 6 X 0 is undefined/unknown position 654 */ 655 enum AVChromaLocation{ 656 AVCHROMA_LOC_UNSPECIFIED = 0, 657 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default 658 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263 659 AVCHROMA_LOC_TOPLEFT = 3, ///< DV 660 AVCHROMA_LOC_TOP = 4, 661 AVCHROMA_LOC_BOTTOMLEFT = 5, 662 AVCHROMA_LOC_BOTTOM = 6, 663 AVCHROMA_LOC_NB , ///< Not part of ABI 664 }; 665 666 enum AVAudioServiceType { 667 AV_AUDIO_SERVICE_TYPE_MAIN = 0, 668 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1, 669 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2, 670 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3, 671 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4, 672 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5, 673 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6, 674 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7, 675 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8, 676 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI 677 }; 678 679 /** 680 * @ingroup lavc_encoding 681 */ 682 typedef struct RcOverride{ 683 int start_frame; 684 int end_frame; 685 int qscale; // If this is 0 then quality_factor will be used instead. 686 float quality_factor; 687 } RcOverride; 688 689 #define FF_MAX_B_FRAMES 16 690 691 /* encoding support 692 These flags can be passed in AVCodecContext.flags before initialization. 693 Note: Not everything is supported yet. 694 */ 695 696 /** 697 * Allow decoders to produce frames with data planes that are not aligned 698 * to CPU requirements (e.g. due to cropping). 699 */ 700 #define CODEC_FLAG_UNALIGNED 0x0001 701 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale. 702 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263. 703 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC. 704 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC. 705 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>. 706 /** 707 * The parent program guarantees that the input for B-frames containing 708 * streams is not written to for at least s->max_b_frames+1 frames, if 709 * this is not set the input will be copied. 710 */ 711 #define CODEC_FLAG_INPUT_PRESERVED 0x0100 712 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode. 713 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode. 714 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale. 715 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges. 716 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding. 717 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random 718 location instead of only at frame boundaries. */ 719 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization. 720 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT. 721 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay. 722 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe. 723 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT). 724 /* Fx : Flag for h263+ extra options */ 725 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction 726 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter 727 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation 728 #define CODEC_FLAG_CLOSED_GOP 0x80000000 729 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks. 730 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding. 731 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata. 732 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!! 733 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS. 734 735 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries. 736 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe 737 738 /* Unsupported options : 739 * Syntax Arithmetic coding (SAC) 740 * Reference Picture Selection 741 * Independent Segment Decoding */ 742 /* /Fx */ 743 /* codec capabilities */ 744 745 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback. 746 /** 747 * Codec uses get_buffer() for allocating buffers and supports custom allocators. 748 * If not set, it might not use get_buffer() at all or use operations that 749 * assume the buffer was allocated by avcodec_default_get_buffer. 750 */ 751 #define CODEC_CAP_DR1 0x0002 752 #define CODEC_CAP_TRUNCATED 0x0008 753 /* Codec can export data for HW decoding (XvMC). */ 754 #define CODEC_CAP_HWACCEL 0x0010 755 /** 756 * Encoder or decoder requires flushing with NULL input at the end in order to 757 * give the complete and correct output. 758 * 759 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with 760 * with NULL data. The user can still send NULL data to the public encode 761 * or decode function, but libavcodec will not pass it along to the codec 762 * unless this flag is set. 763 * 764 * Decoders: 765 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL, 766 * avpkt->size=0 at the end to get the delayed data until the decoder no longer 767 * returns frames. 768 * 769 * Encoders: 770 * The encoder needs to be fed with NULL data at the end of encoding until the 771 * encoder no longer returns data. 772 * 773 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this 774 * flag also means that the encoder must set the pts and duration for 775 * each output packet. If this flag is not set, the pts and duration will 776 * be determined by libavcodec from the input frame. 777 */ 778 #define CODEC_CAP_DELAY 0x0020 779 /** 780 * Codec can be fed a final frame with a smaller size. 781 * This can be used to prevent truncation of the last audio samples. 782 */ 783 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040 784 /** 785 * Codec can export data for HW decoding (VDPAU). 786 */ 787 #define CODEC_CAP_HWACCEL_VDPAU 0x0080 788 /** 789 * Codec can output multiple frames per AVPacket 790 * Normally demuxers return one frame at a time, demuxers which do not do 791 * are connected to a parser to split what they return into proper frames. 792 * This flag is reserved to the very rare category of codecs which have a 793 * bitstream that cannot be split into frames without timeconsuming 794 * operations like full decoding. Demuxers carring such bitstreams thus 795 * may return multiple frames in a packet. This has many disadvantages like 796 * prohibiting stream copy in many cases thus it should only be considered 797 * as a last resort. 798 */ 799 #define CODEC_CAP_SUBFRAMES 0x0100 800 /** 801 * Codec is experimental and is thus avoided in favor of non experimental 802 * encoders 803 */ 804 #define CODEC_CAP_EXPERIMENTAL 0x0200 805 /** 806 * Codec should fill in channel configuration and samplerate instead of container 807 */ 808 #define CODEC_CAP_CHANNEL_CONF 0x0400 809 810 /** 811 * Codec is able to deal with negative linesizes 812 */ 813 #define CODEC_CAP_NEG_LINESIZES 0x0800 814 815 /** 816 * Codec supports frame-level multithreading. 817 */ 818 #define CODEC_CAP_FRAME_THREADS 0x1000 819 /** 820 * Codec supports slice-based (or partition-based) multithreading. 821 */ 822 #define CODEC_CAP_SLICE_THREADS 0x2000 823 /** 824 * Codec supports changed parameters at any point. 825 */ 826 #define CODEC_CAP_PARAM_CHANGE 0x4000 827 /** 828 * Codec supports avctx->thread_count == 0 (auto). 829 */ 830 #define CODEC_CAP_AUTO_THREADS 0x8000 831 /** 832 * Audio encoder supports receiving a different number of samples in each call. 833 */ 834 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000 835 /** 836 * Codec is intra only. 837 */ 838 #define CODEC_CAP_INTRA_ONLY 0x40000000 839 /** 840 * Codec is lossless. 841 */ 842 #define CODEC_CAP_LOSSLESS 0x80000000 843 844 //The following defines may change, don't expect compatibility if you use them. 845 #define MB_TYPE_INTRA4x4 0x0001 846 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific 847 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific 848 #define MB_TYPE_16x16 0x0008 849 #define MB_TYPE_16x8 0x0010 850 #define MB_TYPE_8x16 0x0020 851 #define MB_TYPE_8x8 0x0040 852 #define MB_TYPE_INTERLACED 0x0080 853 #define MB_TYPE_DIRECT2 0x0100 //FIXME 854 #define MB_TYPE_ACPRED 0x0200 855 #define MB_TYPE_GMC 0x0400 856 #define MB_TYPE_SKIP 0x0800 857 #define MB_TYPE_P0L0 0x1000 858 #define MB_TYPE_P1L0 0x2000 859 #define MB_TYPE_P0L1 0x4000 860 #define MB_TYPE_P1L1 0x8000 861 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0) 862 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1) 863 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1) 864 #define MB_TYPE_QUANT 0x00010000 865 #define MB_TYPE_CBP 0x00020000 866 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...) 867 868 /** 869 * Pan Scan area. 870 * This specifies the area which should be displayed. 871 * Note there may be multiple such areas for one frame. 872 */ 873 typedef struct AVPanScan{ 874 /** 875 * id 876 * - encoding: Set by user. 877 * - decoding: Set by libavcodec. 878 */ 879 int id; 880 881 /** 882 * width and height in 1/16 pel 883 * - encoding: Set by user. 884 * - decoding: Set by libavcodec. 885 */ 886 int width; 887 int height; 888 889 /** 890 * position of the top left corner in 1/16 pel for up to 3 fields/frames 891 * - encoding: Set by user. 892 * - decoding: Set by libavcodec. 893 */ 894 int16_t position[3][2]; 895 }AVPanScan; 896 897 #define FF_QSCALE_TYPE_MPEG1 0 898 #define FF_QSCALE_TYPE_MPEG2 1 899 #define FF_QSCALE_TYPE_H264 2 900 #define FF_QSCALE_TYPE_VP56 3 901 902 #if FF_API_GET_BUFFER 903 #define FF_BUFFER_TYPE_INTERNAL 1 904 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user) 905 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared. 906 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything. 907 908 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore). 909 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer. 910 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content. 911 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update). 912 #endif 913 914 /** 915 * The decoder will keep a reference to the frame and may reuse it later. 916 */ 917 #define AV_GET_BUFFER_FLAG_REF (1 << 0) 918 919 /** 920 * @defgroup lavc_packet AVPacket 921 * 922 * Types and functions for working with AVPacket. 923 * @{ 924 */ 925 enum AVPacketSideDataType { 926 AV_PKT_DATA_PALETTE, 927 AV_PKT_DATA_NEW_EXTRADATA, 928 929 /** 930 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows: 931 * @code 932 * u32le param_flags 933 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) 934 * s32le channel_count 935 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) 936 * u64le channel_layout 937 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) 938 * s32le sample_rate 939 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) 940 * s32le width 941 * s32le height 942 * @endcode 943 */ 944 AV_PKT_DATA_PARAM_CHANGE, 945 946 /** 947 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of 948 * structures with info about macroblocks relevant to splitting the 949 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190). 950 * That is, it does not necessarily contain info about all macroblocks, 951 * as long as the distance between macroblocks in the info is smaller 952 * than the target payload size. 953 * Each MB info structure is 12 bytes, and is laid out as follows: 954 * @code 955 * u32le bit offset from the start of the packet 956 * u8 current quantizer at the start of the macroblock 957 * u8 GOB number 958 * u16le macroblock address within the GOB 959 * u8 horizontal MV predictor 960 * u8 vertical MV predictor 961 * u8 horizontal MV predictor for block number 3 962 * u8 vertical MV predictor for block number 3 963 * @endcode 964 */ 965 AV_PKT_DATA_H263_MB_INFO, 966 967 /** 968 * Recommmends skipping the specified number of samples 969 * @code 970 * u32le number of samples to skip from start of this packet 971 * u32le number of samples to skip from end of this packet 972 * u8 reason for start skip 973 * u8 reason for end skip (0=padding silence, 1=convergence) 974 * @endcode 975 */ 976 AV_PKT_DATA_SKIP_SAMPLES=70, 977 978 /** 979 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that 980 * the packet may contain "dual mono" audio specific to Japanese DTV 981 * and if it is true, recommends only the selected channel to be used. 982 * @code 983 * u8 selected channels (0=mail/left, 1=sub/right, 2=both) 984 * @endcode 985 */ 986 AV_PKT_DATA_JP_DUALMONO, 987 988 /** 989 * A list of zero terminated key/value strings. There is no end marker for 990 * the list, so it is required to rely on the side data size to stop. 991 */ 992 AV_PKT_DATA_STRINGS_METADATA, 993 994 /** 995 * Subtitle event position 996 * @code 997 * u32le x1 998 * u32le y1 999 * u32le x2 1000 * u32le y2 1001 * @endcode 1002 */ 1003 AV_PKT_DATA_SUBTITLE_POSITION, 1004 1005 /** 1006 * Data found in BlockAdditional element of matroska container. There is 1007 * no end marker for the data, so it is required to rely on the side data 1008 * size to recognize the end. 8 byte id (as found in BlockAddId) followed 1009 * by data. 1010 */ 1011 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, 1012 1013 /** 1014 * The optional first identifier line of a WebVTT cue. 1015 */ 1016 AV_PKT_DATA_WEBVTT_IDENTIFIER, 1017 1018 /** 1019 * The optional settings (rendering instructions) that immediately 1020 * follow the timestamp specifier of a WebVTT cue. 1021 */ 1022 AV_PKT_DATA_WEBVTT_SETTINGS, 1023 }; 1024 1025 /** 1026 * This structure stores compressed data. It is typically exported by demuxers 1027 * and then passed as input to decoders, or received as output from encoders and 1028 * then passed to muxers. 1029 * 1030 * For video, it should typically contain one compressed frame. For audio it may 1031 * contain several compressed frames. 1032 * 1033 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public 1034 * ABI. Thus it may be allocated on stack and no new fields can be added to it 1035 * without libavcodec and libavformat major bump. 1036 * 1037 * The semantics of data ownership depends on the buf or destruct (deprecated) 1038 * fields. If either is set, the packet data is dynamically allocated and is 1039 * valid indefinitely until av_free_packet() is called (which in turn calls 1040 * av_buffer_unref()/the destruct callback to free the data). If neither is set, 1041 * the packet data is typically backed by some static buffer somewhere and is 1042 * only valid for a limited time (e.g. until the next read call when demuxing). 1043 * 1044 * The side data is always allocated with av_malloc() and is freed in 1045 * av_free_packet(). 1046 */ 1047 typedef struct AVPacket { 1048 /** 1049 * A reference to the reference-counted buffer where the packet data is 1050 * stored. 1051 * May be NULL, then the packet data is not reference-counted. 1052 */ 1053 AVBufferRef *buf; 1054 /** 1055 * Presentation timestamp in AVStream->time_base units; the time at which 1056 * the decompressed packet will be presented to the user. 1057 * Can be AV_NOPTS_VALUE if it is not stored in the file. 1058 * pts MUST be larger or equal to dts as presentation cannot happen before 1059 * decompression, unless one wants to view hex dumps. Some formats misuse 1060 * the terms dts and pts/cts to mean something different. Such timestamps 1061 * must be converted to true pts/dts before they are stored in AVPacket. 1062 */ 1063 int64_t pts; 1064 /** 1065 * Decompression timestamp in AVStream->time_base units; the time at which 1066 * the packet is decompressed. 1067 * Can be AV_NOPTS_VALUE if it is not stored in the file. 1068 */ 1069 int64_t dts; 1070 uint8_t *data; 1071 int size; 1072 int stream_index; 1073 /** 1074 * A combination of AV_PKT_FLAG values 1075 */ 1076 int flags; 1077 /** 1078 * Additional packet data that can be provided by the container. 1079 * Packet can contain several types of side information. 1080 */ 1081 struct { 1082 uint8_t *data; 1083 int size; 1084 enum AVPacketSideDataType type; 1085 } *side_data; 1086 int side_data_elems; 1087 1088 /** 1089 * Duration of this packet in AVStream->time_base units, 0 if unknown. 1090 * Equals next_pts - this_pts in presentation order. 1091 */ 1092 int duration; 1093 #if FF_API_DESTRUCT_PACKET 1094 attribute_deprecated 1095 void (*destruct)(struct AVPacket *); 1096 attribute_deprecated 1097 void *priv; 1098 #endif 1099 int64_t pos; ///< byte position in stream, -1 if unknown 1100 1101 /** 1102 * Time difference in AVStream->time_base units from the pts of this 1103 * packet to the point at which the output from the decoder has converged 1104 * independent from the availability of previous frames. That is, the 1105 * frames are virtually identical no matter if decoding started from 1106 * the very first frame or from this keyframe. 1107 * Is AV_NOPTS_VALUE if unknown. 1108 * This field is not the display duration of the current packet. 1109 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY 1110 * set. 1111 * 1112 * The purpose of this field is to allow seeking in streams that have no 1113 * keyframes in the conventional sense. It corresponds to the 1114 * recovery point SEI in H.264 and match_time_delta in NUT. It is also 1115 * essential for some types of subtitle streams to ensure that all 1116 * subtitles are correctly displayed after seeking. 1117 */ 1118 int64_t convergence_duration; 1119 } AVPacket; 1120 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe 1121 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted 1122 1123 enum AVSideDataParamChangeFlags { 1124 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001, 1125 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002, 1126 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004, 1127 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008, 1128 }; 1129 /** 1130 * @} 1131 */ 1132 1133 struct AVCodecInternal; 1134 1135 enum AVFieldOrder { 1136 AV_FIELD_UNKNOWN, 1137 AV_FIELD_PROGRESSIVE, 1138 AV_FIELD_TT, //< Top coded_first, top displayed first 1139 AV_FIELD_BB, //< Bottom coded first, bottom displayed first 1140 AV_FIELD_TB, //< Top coded first, bottom displayed first 1141 AV_FIELD_BT, //< Bottom coded first, top displayed first 1142 }; 1143 1144 /** 1145 * main external API structure. 1146 * New fields can be added to the end with minor version bumps. 1147 * Removal, reordering and changes to existing fields require a major 1148 * version bump. 1149 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user 1150 * applications. 1151 * sizeof(AVCodecContext) must not be used outside libav*. 1152 */ 1153 typedef struct AVCodecContext { 1154 /** 1155 * information on struct for av_log 1156 * - set by avcodec_alloc_context3 1157 */ 1158 const AVClass *av_class; 1159 int log_level_offset; 1160 1161 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */ 1162 const struct AVCodec *codec; 1163 char codec_name[32]; 1164 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */ 1165 1166 /** 1167 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). 1168 * This is used to work around some encoder bugs. 1169 * A demuxer should set this to what is stored in the field used to identify the codec. 1170 * If there are multiple such fields in a container then the demuxer should choose the one 1171 * which maximizes the information about the used codec. 1172 * If the codec tag field in a container is larger than 32 bits then the demuxer should 1173 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new 1174 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated 1175 * first. 1176 * - encoding: Set by user, if not then the default based on codec_id will be used. 1177 * - decoding: Set by user, will be converted to uppercase by libavcodec during init. 1178 */ 1179 unsigned int codec_tag; 1180 1181 /** 1182 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). 1183 * This is used to work around some encoder bugs. 1184 * - encoding: unused 1185 * - decoding: Set by user, will be converted to uppercase by libavcodec during init. 1186 */ 1187 unsigned int stream_codec_tag; 1188 1189 void *priv_data; 1190 1191 /** 1192 * Private context used for internal data. 1193 * 1194 * Unlike priv_data, this is not codec-specific. It is used in general 1195 * libavcodec functions. 1196 */ 1197 struct AVCodecInternal *internal; 1198 1199 /** 1200 * Private data of the user, can be used to carry app specific stuff. 1201 * - encoding: Set by user. 1202 * - decoding: Set by user. 1203 */ 1204 void *opaque; 1205 1206 /** 1207 * the average bitrate 1208 * - encoding: Set by user; unused for constant quantizer encoding. 1209 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream. 1210 */ 1211 int bit_rate; 1212 1213 /** 1214 * number of bits the bitstream is allowed to diverge from the reference. 1215 * the reference can be CBR (for CBR pass1) or VBR (for pass2) 1216 * - encoding: Set by user; unused for constant quantizer encoding. 1217 * - decoding: unused 1218 */ 1219 int bit_rate_tolerance; 1220 1221 /** 1222 * Global quality for codecs which cannot change it per frame. 1223 * This should be proportional to MPEG-1/2/4 qscale. 1224 * - encoding: Set by user. 1225 * - decoding: unused 1226 */ 1227 int global_quality; 1228 1229 /** 1230 * - encoding: Set by user. 1231 * - decoding: unused 1232 */ 1233 int compression_level; 1234 #define FF_COMPRESSION_DEFAULT -1 1235 1236 /** 1237 * CODEC_FLAG_*. 1238 * - encoding: Set by user. 1239 * - decoding: Set by user. 1240 */ 1241 int flags; 1242 1243 /** 1244 * CODEC_FLAG2_* 1245 * - encoding: Set by user. 1246 * - decoding: Set by user. 1247 */ 1248 int flags2; 1249 1250 /** 1251 * some codecs need / can use extradata like Huffman tables. 1252 * mjpeg: Huffman tables 1253 * rv10: additional flags 1254 * mpeg4: global headers (they can be in the bitstream or here) 1255 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger 1256 * than extradata_size to avoid problems if it is read with the bitstream reader. 1257 * The bytewise contents of extradata must not depend on the architecture or CPU endianness. 1258 * - encoding: Set/allocated/freed by libavcodec. 1259 * - decoding: Set/allocated/freed by user. 1260 */ 1261 uint8_t *extradata; 1262 int extradata_size; 1263 1264 /** 1265 * This is the fundamental unit of time (in seconds) in terms 1266 * of which frame timestamps are represented. For fixed-fps content, 1267 * timebase should be 1/framerate and timestamp increments should be 1268 * identically 1. 1269 * - encoding: MUST be set by user. 1270 * - decoding: Set by libavcodec. 1271 */ 1272 AVRational time_base; 1273 1274 /** 1275 * For some codecs, the time base is closer to the field rate than the frame rate. 1276 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration 1277 * if no telecine is used ... 1278 * 1279 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2. 1280 */ 1281 int ticks_per_frame; 1282 1283 /** 1284 * Codec delay. 1285 * 1286 * Encoding: Number of frames delay there will be from the encoder input to 1287 * the decoder output. (we assume the decoder matches the spec) 1288 * Decoding: Number of frames delay in addition to what a standard decoder 1289 * as specified in the spec would produce. 1290 * 1291 * Video: 1292 * Number of frames the decoded output will be delayed relative to the 1293 * encoded input. 1294 * 1295 * Audio: 1296 * For encoding, this is the number of "priming" samples added to the 1297 * beginning of the stream. The decoded output will be delayed by this 1298 * many samples relative to the input to the encoder. Note that this 1299 * field is purely informational and does not directly affect the pts 1300 * output by the encoder, which should always be based on the actual 1301 * presentation time, including any delay. 1302 * For decoding, this is the number of samples the decoder needs to 1303 * output before the decoder's output is valid. When seeking, you should 1304 * start decoding this many samples prior to your desired seek point. 1305 * 1306 * - encoding: Set by libavcodec. 1307 * - decoding: Set by libavcodec. 1308 */ 1309 int delay; 1310 1311 1312 /* video only */ 1313 /** 1314 * picture width / height. 1315 * - encoding: MUST be set by user. 1316 * - decoding: May be set by the user before opening the decoder if known e.g. 1317 * from the container. Some decoders will require the dimensions 1318 * to be set by the caller. During decoding, the decoder may 1319 * overwrite those values as required. 1320 */ 1321 int width, height; 1322 1323 /** 1324 * Bitstream width / height, may be different from width/height e.g. when 1325 * the decoded frame is cropped before being output or lowres is enabled. 1326 * - encoding: unused 1327 * - decoding: May be set by the user before opening the decoder if known 1328 * e.g. from the container. During decoding, the decoder may 1329 * overwrite those values as required. 1330 */ 1331 int coded_width, coded_height; 1332 1333 #define FF_ASPECT_EXTENDED 15 1334 1335 /** 1336 * the number of pictures in a group of pictures, or 0 for intra_only 1337 * - encoding: Set by user. 1338 * - decoding: unused 1339 */ 1340 int gop_size; 1341 1342 /** 1343 * Pixel format, see AV_PIX_FMT_xxx. 1344 * May be set by the demuxer if known from headers. 1345 * May be overridden by the decoder if it knows better. 1346 * - encoding: Set by user. 1347 * - decoding: Set by user if known, overridden by libavcodec if known 1348 */ 1349 enum AVPixelFormat pix_fmt; 1350 1351 /** 1352 * Motion estimation algorithm used for video coding. 1353 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex), 1354 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific] 1355 * - encoding: MUST be set by user. 1356 * - decoding: unused 1357 */ 1358 int me_method; 1359 1360 /** 1361 * If non NULL, 'draw_horiz_band' is called by the libavcodec 1362 * decoder to draw a horizontal band. It improves cache usage. Not 1363 * all codecs can do that. You must check the codec capabilities 1364 * beforehand. 1365 * When multithreading is used, it may be called from multiple threads 1366 * at the same time; threads might draw different parts of the same AVFrame, 1367 * or multiple AVFrames, and there is no guarantee that slices will be drawn 1368 * in order. 1369 * The function is also used by hardware acceleration APIs. 1370 * It is called at least once during frame decoding to pass 1371 * the data needed for hardware render. 1372 * In that mode instead of pixel data, AVFrame points to 1373 * a structure specific to the acceleration API. The application 1374 * reads the structure and can change some fields to indicate progress 1375 * or mark state. 1376 * - encoding: unused 1377 * - decoding: Set by user. 1378 * @param height the height of the slice 1379 * @param y the y position of the slice 1380 * @param type 1->top field, 2->bottom field, 3->frame 1381 * @param offset offset into the AVFrame.data from which the slice should be read 1382 */ 1383 void (*draw_horiz_band)(struct AVCodecContext *s, 1384 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], 1385 int y, int type, int height); 1386 1387 /** 1388 * callback to negotiate the pixelFormat 1389 * @param fmt is the list of formats which are supported by the codec, 1390 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality. 1391 * The first is always the native one. 1392 * @return the chosen format 1393 * - encoding: unused 1394 * - decoding: Set by user, if not set the native format will be chosen. 1395 */ 1396 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt); 1397 1398 /** 1399 * maximum number of B-frames between non-B-frames 1400 * Note: The output will be delayed by max_b_frames+1 relative to the input. 1401 * - encoding: Set by user. 1402 * - decoding: unused 1403 */ 1404 int max_b_frames; 1405 1406 /** 1407 * qscale factor between IP and B-frames 1408 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset). 1409 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). 1410 * - encoding: Set by user. 1411 * - decoding: unused 1412 */ 1413 float b_quant_factor; 1414 1415 /** obsolete FIXME remove */ 1416 int rc_strategy; 1417 #define FF_RC_STRATEGY_XVID 1 1418 1419 int b_frame_strategy; 1420 1421 /** 1422 * qscale offset between IP and B-frames 1423 * - encoding: Set by user. 1424 * - decoding: unused 1425 */ 1426 float b_quant_offset; 1427 1428 /** 1429 * Size of the frame reordering buffer in the decoder. 1430 * For MPEG-2 it is 1 IPB or 0 low delay IP. 1431 * - encoding: Set by libavcodec. 1432 * - decoding: Set by libavcodec. 1433 */ 1434 int has_b_frames; 1435 1436 /** 1437 * 0-> h263 quant 1-> mpeg quant 1438 * - encoding: Set by user. 1439 * - decoding: unused 1440 */ 1441 int mpeg_quant; 1442 1443 /** 1444 * qscale factor between P and I-frames 1445 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset). 1446 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). 1447 * - encoding: Set by user. 1448 * - decoding: unused 1449 */ 1450 float i_quant_factor; 1451 1452 /** 1453 * qscale offset between P and I-frames 1454 * - encoding: Set by user. 1455 * - decoding: unused 1456 */ 1457 float i_quant_offset; 1458 1459 /** 1460 * luminance masking (0-> disabled) 1461 * - encoding: Set by user. 1462 * - decoding: unused 1463 */ 1464 float lumi_masking; 1465 1466 /** 1467 * temporary complexity masking (0-> disabled) 1468 * - encoding: Set by user. 1469 * - decoding: unused 1470 */ 1471 float temporal_cplx_masking; 1472 1473 /** 1474 * spatial complexity masking (0-> disabled) 1475 * - encoding: Set by user. 1476 * - decoding: unused 1477 */ 1478 float spatial_cplx_masking; 1479 1480 /** 1481 * p block masking (0-> disabled) 1482 * - encoding: Set by user. 1483 * - decoding: unused 1484 */ 1485 float p_masking; 1486 1487 /** 1488 * darkness masking (0-> disabled) 1489 * - encoding: Set by user. 1490 * - decoding: unused 1491 */ 1492 float dark_masking; 1493 1494 /** 1495 * slice count 1496 * - encoding: Set by libavcodec. 1497 * - decoding: Set by user (or 0). 1498 */ 1499 int slice_count; 1500 /** 1501 * prediction method (needed for huffyuv) 1502 * - encoding: Set by user. 1503 * - decoding: unused 1504 */ 1505 int prediction_method; 1506 #define FF_PRED_LEFT 0 1507 #define FF_PRED_PLANE 1 1508 #define FF_PRED_MEDIAN 2 1509 1510 /** 1511 * slice offsets in the frame in bytes 1512 * - encoding: Set/allocated by libavcodec. 1513 * - decoding: Set/allocated by user (or NULL). 1514 */ 1515 int *slice_offset; 1516 1517 /** 1518 * sample aspect ratio (0 if unknown) 1519 * That is the width of a pixel divided by the height of the pixel. 1520 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards. 1521 * - encoding: Set by user. 1522 * - decoding: Set by libavcodec. 1523 */ 1524 AVRational sample_aspect_ratio; 1525 1526 /** 1527 * motion estimation comparison function 1528 * - encoding: Set by user. 1529 * - decoding: unused 1530 */ 1531 int me_cmp; 1532 /** 1533 * subpixel motion estimation comparison function 1534 * - encoding: Set by user. 1535 * - decoding: unused 1536 */ 1537 int me_sub_cmp; 1538 /** 1539 * macroblock comparison function (not supported yet) 1540 * - encoding: Set by user. 1541 * - decoding: unused 1542 */ 1543 int mb_cmp; 1544 /** 1545 * interlaced DCT comparison function 1546 * - encoding: Set by user. 1547 * - decoding: unused 1548 */ 1549 int ildct_cmp; 1550 #define FF_CMP_SAD 0 1551 #define FF_CMP_SSE 1 1552 #define FF_CMP_SATD 2 1553 #define FF_CMP_DCT 3 1554 #define FF_CMP_PSNR 4 1555 #define FF_CMP_BIT 5 1556 #define FF_CMP_RD 6 1557 #define FF_CMP_ZERO 7 1558 #define FF_CMP_VSAD 8 1559 #define FF_CMP_VSSE 9 1560 #define FF_CMP_NSSE 10 1561 #define FF_CMP_W53 11 1562 #define FF_CMP_W97 12 1563 #define FF_CMP_DCTMAX 13 1564 #define FF_CMP_DCT264 14 1565 #define FF_CMP_CHROMA 256 1566 1567 /** 1568 * ME diamond size & shape 1569 * - encoding: Set by user. 1570 * - decoding: unused 1571 */ 1572 int dia_size; 1573 1574 /** 1575 * amount of previous MV predictors (2a+1 x 2a+1 square) 1576 * - encoding: Set by user. 1577 * - decoding: unused 1578 */ 1579 int last_predictor_count; 1580 1581 /** 1582 * prepass for motion estimation 1583 * - encoding: Set by user. 1584 * - decoding: unused 1585 */ 1586 int pre_me; 1587 1588 /** 1589 * motion estimation prepass comparison function 1590 * - encoding: Set by user. 1591 * - decoding: unused 1592 */ 1593 int me_pre_cmp; 1594 1595 /** 1596 * ME prepass diamond size & shape 1597 * - encoding: Set by user. 1598 * - decoding: unused 1599 */ 1600 int pre_dia_size; 1601 1602 /** 1603 * subpel ME quality 1604 * - encoding: Set by user. 1605 * - decoding: unused 1606 */ 1607 int me_subpel_quality; 1608 1609 /** 1610 * DTG active format information (additional aspect ratio 1611 * information only used in DVB MPEG-2 transport streams) 1612 * 0 if not set. 1613 * 1614 * - encoding: unused 1615 * - decoding: Set by decoder. 1616 */ 1617 int dtg_active_format; 1618 #define FF_DTG_AFD_SAME 8 1619 #define FF_DTG_AFD_4_3 9 1620 #define FF_DTG_AFD_16_9 10 1621 #define FF_DTG_AFD_14_9 11 1622 #define FF_DTG_AFD_4_3_SP_14_9 13 1623 #define FF_DTG_AFD_16_9_SP_14_9 14 1624 #define FF_DTG_AFD_SP_4_3 15 1625 1626 /** 1627 * maximum motion estimation search range in subpel units 1628 * If 0 then no limit. 1629 * 1630 * - encoding: Set by user. 1631 * - decoding: unused 1632 */ 1633 int me_range; 1634 1635 /** 1636 * intra quantizer bias 1637 * - encoding: Set by user. 1638 * - decoding: unused 1639 */ 1640 int intra_quant_bias; 1641 #define FF_DEFAULT_QUANT_BIAS 999999 1642 1643 /** 1644 * inter quantizer bias 1645 * - encoding: Set by user. 1646 * - decoding: unused 1647 */ 1648 int inter_quant_bias; 1649 1650 /** 1651 * slice flags 1652 * - encoding: unused 1653 * - decoding: Set by user. 1654 */ 1655 int slice_flags; 1656 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display 1657 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics) 1658 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1) 1659 1660 /** 1661 * XVideo Motion Acceleration 1662 * - encoding: forbidden 1663 * - decoding: set by decoder 1664 */ 1665 int xvmc_acceleration; 1666 1667 /** 1668 * macroblock decision mode 1669 * - encoding: Set by user. 1670 * - decoding: unused 1671 */ 1672 int mb_decision; 1673 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp 1674 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits 1675 #define FF_MB_DECISION_RD 2 ///< rate distortion 1676 1677 /** 1678 * custom intra quantization matrix 1679 * - encoding: Set by user, can be NULL. 1680 * - decoding: Set by libavcodec. 1681 */ 1682 uint16_t *intra_matrix; 1683 1684 /** 1685 * custom inter quantization matrix 1686 * - encoding: Set by user, can be NULL. 1687 * - decoding: Set by libavcodec. 1688 */ 1689 uint16_t *inter_matrix; 1690 1691 /** 1692 * scene change detection threshold 1693 * 0 is default, larger means fewer detected scene changes. 1694 * - encoding: Set by user. 1695 * - decoding: unused 1696 */ 1697 int scenechange_threshold; 1698 1699 /** 1700 * noise reduction strength 1701 * - encoding: Set by user. 1702 * - decoding: unused 1703 */ 1704 int noise_reduction; 1705 1706 /** 1707 * Motion estimation threshold below which no motion estimation is 1708 * performed, but instead the user specified motion vectors are used. 1709 * 1710 * - encoding: Set by user. 1711 * - decoding: unused 1712 */ 1713 int me_threshold; 1714 1715 /** 1716 * Macroblock threshold below which the user specified macroblock types will be used. 1717 * - encoding: Set by user. 1718 * - decoding: unused 1719 */ 1720 int mb_threshold; 1721 1722 /** 1723 * precision of the intra DC coefficient - 8 1724 * - encoding: Set by user. 1725 * - decoding: unused 1726 */ 1727 int intra_dc_precision; 1728 1729 /** 1730 * Number of macroblock rows at the top which are skipped. 1731 * - encoding: unused 1732 * - decoding: Set by user. 1733 */ 1734 int skip_top; 1735 1736 /** 1737 * Number of macroblock rows at the bottom which are skipped. 1738 * - encoding: unused 1739 * - decoding: Set by user. 1740 */ 1741 int skip_bottom; 1742 1743 /** 1744 * Border processing masking, raises the quantizer for mbs on the borders 1745 * of the picture. 1746 * - encoding: Set by user. 1747 * - decoding: unused 1748 */ 1749 float border_masking; 1750 1751 /** 1752 * minimum MB lagrange multipler 1753 * - encoding: Set by user. 1754 * - decoding: unused 1755 */ 1756 int mb_lmin; 1757 1758 /** 1759 * maximum MB lagrange multipler 1760 * - encoding: Set by user. 1761 * - decoding: unused 1762 */ 1763 int mb_lmax; 1764 1765 /** 1766 * 1767 * - encoding: Set by user. 1768 * - decoding: unused 1769 */ 1770 int me_penalty_compensation; 1771 1772 /** 1773 * 1774 * - encoding: Set by user. 1775 * - decoding: unused 1776 */ 1777 int bidir_refine; 1778 1779 /** 1780 * 1781 * - encoding: Set by user. 1782 * - decoding: unused 1783 */ 1784 int brd_scale; 1785 1786 /** 1787 * minimum GOP size 1788 * - encoding: Set by user. 1789 * - decoding: unused 1790 */ 1791 int keyint_min; 1792 1793 /** 1794 * number of reference frames 1795 * - encoding: Set by user. 1796 * - decoding: Set by lavc. 1797 */ 1798 int refs; 1799 1800 /** 1801 * chroma qp offset from luma 1802 * - encoding: Set by user. 1803 * - decoding: unused 1804 */ 1805 int chromaoffset; 1806 1807 /** 1808 * Multiplied by qscale for each frame and added to scene_change_score. 1809 * - encoding: Set by user. 1810 * - decoding: unused 1811 */ 1812 int scenechange_factor; 1813 1814 /** 1815 * 1816 * Note: Value depends upon the compare function used for fullpel ME. 1817 * - encoding: Set by user. 1818 * - decoding: unused 1819 */ 1820 int mv0_threshold; 1821 1822 /** 1823 * Adjust sensitivity of b_frame_strategy 1. 1824 * - encoding: Set by user. 1825 * - decoding: unused 1826 */ 1827 int b_sensitivity; 1828 1829 /** 1830 * Chromaticity coordinates of the source primaries. 1831 * - encoding: Set by user 1832 * - decoding: Set by libavcodec 1833 */ 1834 enum AVColorPrimaries color_primaries; 1835 1836 /** 1837 * Color Transfer Characteristic. 1838 * - encoding: Set by user 1839 * - decoding: Set by libavcodec 1840 */ 1841 enum AVColorTransferCharacteristic color_trc; 1842 1843 /** 1844 * YUV colorspace type. 1845 * - encoding: Set by user 1846 * - decoding: Set by libavcodec 1847 */ 1848 enum AVColorSpace colorspace; 1849 1850 /** 1851 * MPEG vs JPEG YUV range. 1852 * - encoding: Set by user 1853 * - decoding: Set by libavcodec 1854 */ 1855 enum AVColorRange color_range; 1856 1857 /** 1858 * This defines the location of chroma samples. 1859 * - encoding: Set by user 1860 * - decoding: Set by libavcodec 1861 */ 1862 enum AVChromaLocation chroma_sample_location; 1863 1864 /** 1865 * Number of slices. 1866 * Indicates number of picture subdivisions. Used for parallelized 1867 * decoding. 1868 * - encoding: Set by user 1869 * - decoding: unused 1870 */ 1871 int slices; 1872 1873 /** Field order 1874 * - encoding: set by libavcodec 1875 * - decoding: Set by user. 1876 */ 1877 enum AVFieldOrder field_order; 1878 1879 /* audio only */ 1880 int sample_rate; ///< samples per second 1881 int channels; ///< number of audio channels 1882 1883 /** 1884 * audio sample format 1885 * - encoding: Set by user. 1886 * - decoding: Set by libavcodec. 1887 */ 1888 enum AVSampleFormat sample_fmt; ///< sample format 1889 1890 /* The following data should not be initialized. */ 1891 /** 1892 * Number of samples per channel in an audio frame. 1893 * 1894 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame 1895 * except the last must contain exactly frame_size samples per channel. 1896 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the 1897 * frame size is not restricted. 1898 * - decoding: may be set by some decoders to indicate constant frame size 1899 */ 1900 int frame_size; 1901 1902 /** 1903 * Frame counter, set by libavcodec. 1904 * 1905 * - decoding: total number of frames returned from the decoder so far. 1906 * - encoding: total number of frames passed to the encoder so far. 1907 * 1908 * @note the counter is not incremented if encoding/decoding resulted in 1909 * an error. 1910 */ 1911 int frame_number; 1912 1913 /** 1914 * number of bytes per packet if constant and known or 0 1915 * Used by some WAV based audio codecs. 1916 */ 1917 int block_align; 1918 1919 /** 1920 * Audio cutoff bandwidth (0 means "automatic") 1921 * - encoding: Set by user. 1922 * - decoding: unused 1923 */ 1924 int cutoff; 1925 1926 #if FF_API_REQUEST_CHANNELS 1927 /** 1928 * Decoder should decode to this many channels if it can (0 for default) 1929 * - encoding: unused 1930 * - decoding: Set by user. 1931 * @deprecated Deprecated in favor of request_channel_layout. 1932 */ 1933 int request_channels; 1934 #endif 1935 1936 /** 1937 * Audio channel layout. 1938 * - encoding: set by user. 1939 * - decoding: set by user, may be overwritten by libavcodec. 1940 */ 1941 uint64_t channel_layout; 1942 1943 /** 1944 * Request decoder to use this channel layout if it can (0 for default) 1945 * - encoding: unused 1946 * - decoding: Set by user. 1947 */ 1948 uint64_t request_channel_layout; 1949 1950 /** 1951 * Type of service that the audio stream conveys. 1952 * - encoding: Set by user. 1953 * - decoding: Set by libavcodec. 1954 */ 1955 enum AVAudioServiceType audio_service_type; 1956 1957 /** 1958 * desired sample format 1959 * - encoding: Not used. 1960 * - decoding: Set by user. 1961 * Decoder will decode to this format if it can. 1962 */ 1963 enum AVSampleFormat request_sample_fmt; 1964 1965 #if FF_API_GET_BUFFER 1966 /** 1967 * Called at the beginning of each frame to get a buffer for it. 1968 * 1969 * The function will set AVFrame.data[], AVFrame.linesize[]. 1970 * AVFrame.extended_data[] must also be set, but it should be the same as 1971 * AVFrame.data[] except for planar audio with more channels than can fit 1972 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as 1973 * many data pointers as it can hold. 1974 * 1975 * if CODEC_CAP_DR1 is not set then get_buffer() must call 1976 * avcodec_default_get_buffer() instead of providing buffers allocated by 1977 * some other means. 1978 * 1979 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't 1980 * need it. avcodec_default_get_buffer() aligns the output buffer properly, 1981 * but if get_buffer() is overridden then alignment considerations should 1982 * be taken into account. 1983 * 1984 * @see avcodec_default_get_buffer() 1985 * 1986 * Video: 1987 * 1988 * If pic.reference is set then the frame will be read later by libavcodec. 1989 * avcodec_align_dimensions2() should be used to find the required width and 1990 * height, as they normally need to be rounded up to the next multiple of 16. 1991 * 1992 * If frame multithreading is used and thread_safe_callbacks is set, 1993 * it may be called from a different thread, but not from more than one at 1994 * once. Does not need to be reentrant. 1995 * 1996 * @see release_buffer(), reget_buffer() 1997 * @see avcodec_align_dimensions2() 1998 * 1999 * Audio: 2000 * 2001 * Decoders request a buffer of a particular size by setting 2002 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may, 2003 * however, utilize only part of the buffer by setting AVFrame.nb_samples 2004 * to a smaller value in the output frame. 2005 * 2006 * Decoders cannot use the buffer after returning from 2007 * avcodec_decode_audio4(), so they will not call release_buffer(), as it 2008 * is assumed to be released immediately upon return. In some rare cases, 2009 * a decoder may need to call get_buffer() more than once in a single 2010 * call to avcodec_decode_audio4(). In that case, when get_buffer() is 2011 * called again after it has already been called once, the previously 2012 * acquired buffer is assumed to be released at that time and may not be 2013 * reused by the decoder. 2014 * 2015 * As a convenience, av_samples_get_buffer_size() and 2016 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer() 2017 * functions to find the required data size and to fill data pointers and 2018 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio 2019 * since all planes must be the same size. 2020 * 2021 * @see av_samples_get_buffer_size(), av_samples_fill_arrays() 2022 * 2023 * - encoding: unused 2024 * - decoding: Set by libavcodec, user can override. 2025 * 2026 * @deprecated use get_buffer2() 2027 */ 2028 attribute_deprecated 2029 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic); 2030 2031 /** 2032 * Called to release buffers which were allocated with get_buffer. 2033 * A released buffer can be reused in get_buffer(). 2034 * pic.data[*] must be set to NULL. 2035 * May be called from a different thread if frame multithreading is used, 2036 * but not by more than one thread at once, so does not need to be reentrant. 2037 * - encoding: unused 2038 * - decoding: Set by libavcodec, user can override. 2039 * 2040 * @deprecated custom freeing callbacks should be set from get_buffer2() 2041 */ 2042 attribute_deprecated 2043 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic); 2044 2045 /** 2046 * Called at the beginning of a frame to get cr buffer for it. 2047 * Buffer type (size, hints) must be the same. libavcodec won't check it. 2048 * libavcodec will pass previous buffer in pic, function should return 2049 * same buffer or new buffer with old frame "painted" into it. 2050 * If pic.data[0] == NULL must behave like get_buffer(). 2051 * if CODEC_CAP_DR1 is not set then reget_buffer() must call 2052 * avcodec_default_reget_buffer() instead of providing buffers allocated by 2053 * some other means. 2054 * - encoding: unused 2055 * - decoding: Set by libavcodec, user can override. 2056 */ 2057 attribute_deprecated 2058 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic); 2059 #endif 2060 2061 /** 2062 * This callback is called at the beginning of each frame to get data 2063 * buffer(s) for it. There may be one contiguous buffer for all the data or 2064 * there may be a buffer per each data plane or anything in between. What 2065 * this means is, you may set however many entries in buf[] you feel necessary. 2066 * Each buffer must be reference-counted using the AVBuffer API (see description 2067 * of buf[] below). 2068 * 2069 * The following fields will be set in the frame before this callback is 2070 * called: 2071 * - format 2072 * - width, height (video only) 2073 * - sample_rate, channel_layout, nb_samples (audio only) 2074 * Their values may differ from the corresponding values in 2075 * AVCodecContext. This callback must use the frame values, not the codec 2076 * context values, to calculate the required buffer size. 2077 * 2078 * This callback must fill the following fields in the frame: 2079 * - data[] 2080 * - linesize[] 2081 * - extended_data: 2082 * * if the data is planar audio with more than 8 channels, then this 2083 * callback must allocate and fill extended_data to contain all pointers 2084 * to all data planes. data[] must hold as many pointers as it can. 2085 * extended_data must be allocated with av_malloc() and will be freed in 2086 * av_frame_unref(). 2087 * * otherwise exended_data must point to data 2088 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of 2089 * the frame's data and extended_data pointers must be contained in these. That 2090 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one 2091 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(), 2092 * and av_buffer_ref(). 2093 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by 2094 * this callback and filled with the extra buffers if there are more 2095 * buffers than buf[] can hold. extended_buf will be freed in 2096 * av_frame_unref(). 2097 * 2098 * If CODEC_CAP_DR1 is not set then get_buffer2() must call 2099 * avcodec_default_get_buffer2() instead of providing buffers allocated by 2100 * some other means. 2101 * 2102 * Each data plane must be aligned to the maximum required by the target 2103 * CPU. 2104 * 2105 * @see avcodec_default_get_buffer2() 2106 * 2107 * Video: 2108 * 2109 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused 2110 * (read and/or written to if it is writable) later by libavcodec. 2111 * 2112 * If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an 2113 * edge of the size returned by avcodec_get_edge_width() on all sides. 2114 * 2115 * avcodec_align_dimensions2() should be used to find the required width and 2116 * height, as they normally need to be rounded up to the next multiple of 16. 2117 * 2118 * If frame multithreading is used and thread_safe_callbacks is set, 2119 * this callback may be called from a different thread, but not from more 2120 * than one at once. Does not need to be reentrant. 2121 * 2122 * @see avcodec_align_dimensions2() 2123 * 2124 * Audio: 2125 * 2126 * Decoders request a buffer of a particular size by setting 2127 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may, 2128 * however, utilize only part of the buffer by setting AVFrame.nb_samples 2129 * to a smaller value in the output frame. 2130 * 2131 * As a convenience, av_samples_get_buffer_size() and 2132 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2() 2133 * functions to find the required data size and to fill data pointers and 2134 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio 2135 * since all planes must be the same size. 2136 * 2137 * @see av_samples_get_buffer_size(), av_samples_fill_arrays() 2138 * 2139 * - encoding: unused 2140 * - decoding: Set by libavcodec, user can override. 2141 */ 2142 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags); 2143 2144 /** 2145 * If non-zero, the decoded audio and video frames returned from 2146 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted 2147 * and are valid indefinitely. The caller must free them with 2148 * av_frame_unref() when they are not needed anymore. 2149 * Otherwise, the decoded frames must not be freed by the caller and are 2150 * only valid until the next decode call. 2151 * 2152 * - encoding: unused 2153 * - decoding: set by the caller before avcodec_open2(). 2154 */ 2155 int refcounted_frames; 2156 2157 /* - encoding parameters */ 2158 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0) 2159 float qblur; ///< amount of qscale smoothing over time (0.0-1.0) 2160 2161 /** 2162 * minimum quantizer 2163 * - encoding: Set by user. 2164 * - decoding: unused 2165 */ 2166 int qmin; 2167 2168 /** 2169 * maximum quantizer 2170 * - encoding: Set by user. 2171 * - decoding: unused 2172 */ 2173 int qmax; 2174 2175 /** 2176 * maximum quantizer difference between frames 2177 * - encoding: Set by user. 2178 * - decoding: unused 2179 */ 2180 int max_qdiff; 2181 2182 /** 2183 * ratecontrol qmin qmax limiting method 2184 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax. 2185 * - encoding: Set by user. 2186 * - decoding: unused 2187 */ 2188 float rc_qsquish; 2189 2190 float rc_qmod_amp; 2191 int rc_qmod_freq; 2192 2193 /** 2194 * decoder bitstream buffer size 2195 * - encoding: Set by user. 2196 * - decoding: unused 2197 */ 2198 int rc_buffer_size; 2199 2200 /** 2201 * ratecontrol override, see RcOverride 2202 * - encoding: Allocated/set/freed by user. 2203 * - decoding: unused 2204 */ 2205 int rc_override_count; 2206 RcOverride *rc_override; 2207 2208 /** 2209 * rate control equation 2210 * - encoding: Set by user 2211 * - decoding: unused 2212 */ 2213 const char *rc_eq; 2214 2215 /** 2216 * maximum bitrate 2217 * - encoding: Set by user. 2218 * - decoding: unused 2219 */ 2220 int rc_max_rate; 2221 2222 /** 2223 * minimum bitrate 2224 * - encoding: Set by user. 2225 * - decoding: unused 2226 */ 2227 int rc_min_rate; 2228 2229 float rc_buffer_aggressivity; 2230 2231 /** 2232 * initial complexity for pass1 ratecontrol 2233 * - encoding: Set by user. 2234 * - decoding: unused 2235 */ 2236 float rc_initial_cplx; 2237 2238 /** 2239 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow. 2240 * - encoding: Set by user. 2241 * - decoding: unused. 2242 */ 2243 float rc_max_available_vbv_use; 2244 2245 /** 2246 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow. 2247 * - encoding: Set by user. 2248 * - decoding: unused. 2249 */ 2250 float rc_min_vbv_overflow_use; 2251 2252 /** 2253 * Number of bits which should be loaded into the rc buffer before decoding starts. 2254 * - encoding: Set by user. 2255 * - decoding: unused 2256 */ 2257 int rc_initial_buffer_occupancy; 2258 2259 #define FF_CODER_TYPE_VLC 0 2260 #define FF_CODER_TYPE_AC 1 2261 #define FF_CODER_TYPE_RAW 2 2262 #define FF_CODER_TYPE_RLE 3 2263 #define FF_CODER_TYPE_DEFLATE 4 2264 /** 2265 * coder type 2266 * - encoding: Set by user. 2267 * - decoding: unused 2268 */ 2269 int coder_type; 2270 2271 /** 2272 * context model 2273 * - encoding: Set by user. 2274 * - decoding: unused 2275 */ 2276 int context_model; 2277 2278 /** 2279 * minimum Lagrange multipler 2280 * - encoding: Set by user. 2281 * - decoding: unused 2282 */ 2283 int lmin; 2284 2285 /** 2286 * maximum Lagrange multipler 2287 * - encoding: Set by user. 2288 * - decoding: unused 2289 */ 2290 int lmax; 2291 2292 /** 2293 * frame skip threshold 2294 * - encoding: Set by user. 2295 * - decoding: unused 2296 */ 2297 int frame_skip_threshold; 2298 2299 /** 2300 * frame skip factor 2301 * - encoding: Set by user. 2302 * - decoding: unused 2303 */ 2304 int frame_skip_factor; 2305 2306 /** 2307 * frame skip exponent 2308 * - encoding: Set by user. 2309 * - decoding: unused 2310 */ 2311 int frame_skip_exp; 2312 2313 /** 2314 * frame skip comparison function 2315 * - encoding: Set by user. 2316 * - decoding: unused 2317 */ 2318 int frame_skip_cmp; 2319 2320 /** 2321 * trellis RD quantization 2322 * - encoding: Set by user. 2323 * - decoding: unused 2324 */ 2325 int trellis; 2326 2327 /** 2328 * - encoding: Set by user. 2329 * - decoding: unused 2330 */ 2331 int min_prediction_order; 2332 2333 /** 2334 * - encoding: Set by user. 2335 * - decoding: unused 2336 */ 2337 int max_prediction_order; 2338 2339 /** 2340 * GOP timecode frame start number 2341 * - encoding: Set by user, in non drop frame format 2342 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset) 2343 */ 2344 int64_t timecode_frame_start; 2345 2346 /* The RTP callback: This function is called */ 2347 /* every time the encoder has a packet to send. */ 2348 /* It depends on the encoder if the data starts */ 2349 /* with a Start Code (it should). H.263 does. */ 2350 /* mb_nb contains the number of macroblocks */ 2351 /* encoded in the RTP payload. */ 2352 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb); 2353 2354 int rtp_payload_size; /* The size of the RTP payload: the coder will */ 2355 /* do its best to deliver a chunk with size */ 2356 /* below rtp_payload_size, the chunk will start */ 2357 /* with a start code on some codecs like H.263. */ 2358 /* This doesn't take account of any particular */ 2359 /* headers inside the transmitted RTP payload. */ 2360 2361 /* statistics, used for 2-pass encoding */ 2362 int mv_bits; 2363 int header_bits; 2364 int i_tex_bits; 2365 int p_tex_bits; 2366 int i_count; 2367 int p_count; 2368 int skip_count; 2369 int misc_bits; 2370 2371 /** 2372 * number of bits used for the previously encoded frame 2373 * - encoding: Set by libavcodec. 2374 * - decoding: unused 2375 */ 2376 int frame_bits; 2377 2378 /** 2379 * pass1 encoding statistics output buffer 2380 * - encoding: Set by libavcodec. 2381 * - decoding: unused 2382 */ 2383 char *stats_out; 2384 2385 /** 2386 * pass2 encoding statistics input buffer 2387 * Concatenated stuff from stats_out of pass1 should be placed here. 2388 * - encoding: Allocated/set/freed by user. 2389 * - decoding: unused 2390 */ 2391 char *stats_in; 2392 2393 /** 2394 * Work around bugs in encoders which sometimes cannot be detected automatically. 2395 * - encoding: Set by user 2396 * - decoding: Set by user 2397 */ 2398 int workaround_bugs; 2399 #define FF_BUG_AUTODETECT 1 ///< autodetection 2400 #define FF_BUG_OLD_MSMPEG4 2 2401 #define FF_BUG_XVID_ILACE 4 2402 #define FF_BUG_UMP4 8 2403 #define FF_BUG_NO_PADDING 16 2404 #define FF_BUG_AMV 32 2405 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default. 2406 #define FF_BUG_QPEL_CHROMA 64 2407 #define FF_BUG_STD_QPEL 128 2408 #define FF_BUG_QPEL_CHROMA2 256 2409 #define FF_BUG_DIRECT_BLOCKSIZE 512 2410 #define FF_BUG_EDGE 1024 2411 #define FF_BUG_HPEL_CHROMA 2048 2412 #define FF_BUG_DC_CLIP 4096 2413 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders. 2414 #define FF_BUG_TRUNCATED 16384 2415 2416 /** 2417 * strictly follow the standard (MPEG4, ...). 2418 * - encoding: Set by user. 2419 * - decoding: Set by user. 2420 * Setting this to STRICT or higher means the encoder and decoder will 2421 * generally do stupid things, whereas setting it to unofficial or lower 2422 * will mean the encoder might produce output that is not supported by all 2423 * spec-compliant decoders. Decoders don't differentiate between normal, 2424 * unofficial and experimental (that is, they always try to decode things 2425 * when they can) unless they are explicitly asked to behave stupidly 2426 * (=strictly conform to the specs) 2427 */ 2428 int strict_std_compliance; 2429 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software. 2430 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences. 2431 #define FF_COMPLIANCE_NORMAL 0 2432 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions 2433 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things. 2434 2435 /** 2436 * error concealment flags 2437 * - encoding: unused 2438 * - decoding: Set by user. 2439 */ 2440 int error_concealment; 2441 #define FF_EC_GUESS_MVS 1 2442 #define FF_EC_DEBLOCK 2 2443 2444 /** 2445 * debug 2446 * - encoding: Set by user. 2447 * - decoding: Set by user. 2448 */ 2449 int debug; 2450 #define FF_DEBUG_PICT_INFO 1 2451 #define FF_DEBUG_RC 2 2452 #define FF_DEBUG_BITSTREAM 4 2453 #define FF_DEBUG_MB_TYPE 8 2454 #define FF_DEBUG_QP 16 2455 #define FF_DEBUG_MV 32 2456 #define FF_DEBUG_DCT_COEFF 0x00000040 2457 #define FF_DEBUG_SKIP 0x00000080 2458 #define FF_DEBUG_STARTCODE 0x00000100 2459 #define FF_DEBUG_PTS 0x00000200 2460 #define FF_DEBUG_ER 0x00000400 2461 #define FF_DEBUG_MMCO 0x00000800 2462 #define FF_DEBUG_BUGS 0x00001000 2463 #define FF_DEBUG_VIS_QP 0x00002000 2464 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 2465 #define FF_DEBUG_BUFFERS 0x00008000 2466 #define FF_DEBUG_THREADS 0x00010000 2467 2468 /** 2469 * debug 2470 * - encoding: Set by user. 2471 * - decoding: Set by user. 2472 */ 2473 int debug_mv; 2474 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames 2475 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames 2476 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames 2477 2478 /** 2479 * Error recognition; may misdetect some more or less valid parts as errors. 2480 * - encoding: unused 2481 * - decoding: Set by user. 2482 */ 2483 int err_recognition; 2484 #define AV_EF_CRCCHECK (1<<0) 2485 #define AV_EF_BITSTREAM (1<<1) 2486 #define AV_EF_BUFFER (1<<2) 2487 #define AV_EF_EXPLODE (1<<3) 2488 2489 #define AV_EF_CAREFUL (1<<16) 2490 #define AV_EF_COMPLIANT (1<<17) 2491 #define AV_EF_AGGRESSIVE (1<<18) 2492 2493 2494 /** 2495 * opaque 64bit number (generally a PTS) that will be reordered and 2496 * output in AVFrame.reordered_opaque 2497 * @deprecated in favor of pkt_pts 2498 * - encoding: unused 2499 * - decoding: Set by user. 2500 */ 2501 int64_t reordered_opaque; 2502 2503 /** 2504 * Hardware accelerator in use 2505 * - encoding: unused. 2506 * - decoding: Set by libavcodec 2507 */ 2508 struct AVHWAccel *hwaccel; 2509 2510 /** 2511 * Hardware accelerator context. 2512 * For some hardware accelerators, a global context needs to be 2513 * provided by the user. In that case, this holds display-dependent 2514 * data FFmpeg cannot instantiate itself. Please refer to the 2515 * FFmpeg HW accelerator documentation to know how to fill this 2516 * is. e.g. for VA API, this is a struct vaapi_context. 2517 * - encoding: unused 2518 * - decoding: Set by user 2519 */ 2520 void *hwaccel_context; 2521 2522 /** 2523 * error 2524 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR. 2525 * - decoding: unused 2526 */ 2527 uint64_t error[AV_NUM_DATA_POINTERS]; 2528 2529 /** 2530 * DCT algorithm, see FF_DCT_* below 2531 * - encoding: Set by user. 2532 * - decoding: unused 2533 */ 2534 int dct_algo; 2535 #define FF_DCT_AUTO 0 2536 #define FF_DCT_FASTINT 1 2537 #define FF_DCT_INT 2 2538 #define FF_DCT_MMX 3 2539 #define FF_DCT_ALTIVEC 5 2540 #define FF_DCT_FAAN 6 2541 2542 /** 2543 * IDCT algorithm, see FF_IDCT_* below. 2544 * - encoding: Set by user. 2545 * - decoding: Set by user. 2546 */ 2547 int idct_algo; 2548 #define FF_IDCT_AUTO 0 2549 #define FF_IDCT_INT 1 2550 #define FF_IDCT_SIMPLE 2 2551 #define FF_IDCT_SIMPLEMMX 3 2552 #define FF_IDCT_ARM 7 2553 #define FF_IDCT_ALTIVEC 8 2554 #define FF_IDCT_SH4 9 2555 #define FF_IDCT_SIMPLEARM 10 2556 #define FF_IDCT_IPP 13 2557 #define FF_IDCT_XVIDMMX 14 2558 #define FF_IDCT_SIMPLEARMV5TE 16 2559 #define FF_IDCT_SIMPLEARMV6 17 2560 #define FF_IDCT_SIMPLEVIS 18 2561 #define FF_IDCT_FAAN 20 2562 #define FF_IDCT_SIMPLENEON 22 2563 #define FF_IDCT_SIMPLEALPHA 23 2564 2565 /** 2566 * bits per sample/pixel from the demuxer (needed for huffyuv). 2567 * - encoding: Set by libavcodec. 2568 * - decoding: Set by user. 2569 */ 2570 int bits_per_coded_sample; 2571 2572 /** 2573 * Bits per sample/pixel of internal libavcodec pixel/sample format. 2574 * - encoding: set by user. 2575 * - decoding: set by libavcodec. 2576 */ 2577 int bits_per_raw_sample; 2578 2579 #if FF_API_LOWRES 2580 /** 2581 * low resolution decoding, 1-> 1/2 size, 2->1/4 size 2582 * - encoding: unused 2583 * - decoding: Set by user. 2584 * Code outside libavcodec should access this field using: 2585 * av_codec_{get,set}_lowres(avctx) 2586 */ 2587 int lowres; 2588 #endif 2589 2590 /** 2591 * the picture in the bitstream 2592 * - encoding: Set by libavcodec. 2593 * - decoding: Set by libavcodec. 2594 */ 2595 AVFrame *coded_frame; 2596 2597 /** 2598 * thread count 2599 * is used to decide how many independent tasks should be passed to execute() 2600 * - encoding: Set by user. 2601 * - decoding: Set by user. 2602 */ 2603 int thread_count; 2604 2605 /** 2606 * Which multithreading methods to use. 2607 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread, 2608 * so clients which cannot provide future frames should not use it. 2609 * 2610 * - encoding: Set by user, otherwise the default is used. 2611 * - decoding: Set by user, otherwise the default is used. 2612 */ 2613 int thread_type; 2614 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once 2615 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once 2616 2617 /** 2618 * Which multithreading methods are in use by the codec. 2619 * - encoding: Set by libavcodec. 2620 * - decoding: Set by libavcodec. 2621 */ 2622 int active_thread_type; 2623 2624 /** 2625 * Set by the client if its custom get_buffer() callback can be called 2626 * synchronously from another thread, which allows faster multithreaded decoding. 2627 * draw_horiz_band() will be called from other threads regardless of this setting. 2628 * Ignored if the default get_buffer() is used. 2629 * - encoding: Set by user. 2630 * - decoding: Set by user. 2631 */ 2632 int thread_safe_callbacks; 2633 2634 /** 2635 * The codec may call this to execute several independent things. 2636 * It will return only after finishing all tasks. 2637 * The user may replace this with some multithreaded implementation, 2638 * the default implementation will execute the parts serially. 2639 * @param count the number of things to execute 2640 * - encoding: Set by libavcodec, user can override. 2641 * - decoding: Set by libavcodec, user can override. 2642 */ 2643 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size); 2644 2645 /** 2646 * The codec may call this to execute several independent things. 2647 * It will return only after finishing all tasks. 2648 * The user may replace this with some multithreaded implementation, 2649 * the default implementation will execute the parts serially. 2650 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option. 2651 * @param c context passed also to func 2652 * @param count the number of things to execute 2653 * @param arg2 argument passed unchanged to func 2654 * @param ret return values of executed functions, must have space for "count" values. May be NULL. 2655 * @param func function that will be called count times, with jobnr from 0 to count-1. 2656 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no 2657 * two instances of func executing at the same time will have the same threadnr. 2658 * @return always 0 currently, but code should handle a future improvement where when any call to func 2659 * returns < 0 no further calls to func may be done and < 0 is returned. 2660 * - encoding: Set by libavcodec, user can override. 2661 * - decoding: Set by libavcodec, user can override. 2662 */ 2663 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count); 2664 2665 /** 2666 * thread opaque 2667 * Can be used by execute() to store some per AVCodecContext stuff. 2668 * - encoding: set by execute() 2669 * - decoding: set by execute() 2670 */ 2671 void *thread_opaque; 2672 2673 /** 2674 * noise vs. sse weight for the nsse comparsion function 2675 * - encoding: Set by user. 2676 * - decoding: unused 2677 */ 2678 int nsse_weight; 2679 2680 /** 2681 * profile 2682 * - encoding: Set by user. 2683 * - decoding: Set by libavcodec. 2684 */ 2685 int profile; 2686 #define FF_PROFILE_UNKNOWN -99 2687 #define FF_PROFILE_RESERVED -100 2688 2689 #define FF_PROFILE_AAC_MAIN 0 2690 #define FF_PROFILE_AAC_LOW 1 2691 #define FF_PROFILE_AAC_SSR 2 2692 #define FF_PROFILE_AAC_LTP 3 2693 #define FF_PROFILE_AAC_HE 4 2694 #define FF_PROFILE_AAC_HE_V2 28 2695 #define FF_PROFILE_AAC_LD 22 2696 #define FF_PROFILE_AAC_ELD 38 2697 #define FF_PROFILE_MPEG2_AAC_LOW 128 2698 #define FF_PROFILE_MPEG2_AAC_HE 131 2699 2700 #define FF_PROFILE_DTS 20 2701 #define FF_PROFILE_DTS_ES 30 2702 #define FF_PROFILE_DTS_96_24 40 2703 #define FF_PROFILE_DTS_HD_HRA 50 2704 #define FF_PROFILE_DTS_HD_MA 60 2705 2706 #define FF_PROFILE_MPEG2_422 0 2707 #define FF_PROFILE_MPEG2_HIGH 1 2708 #define FF_PROFILE_MPEG2_SS 2 2709 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3 2710 #define FF_PROFILE_MPEG2_MAIN 4 2711 #define FF_PROFILE_MPEG2_SIMPLE 5 2712 2713 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag 2714 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag 2715 2716 #define FF_PROFILE_H264_BASELINE 66 2717 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED) 2718 #define FF_PROFILE_H264_MAIN 77 2719 #define FF_PROFILE_H264_EXTENDED 88 2720 #define FF_PROFILE_H264_HIGH 100 2721 #define FF_PROFILE_H264_HIGH_10 110 2722 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA) 2723 #define FF_PROFILE_H264_HIGH_422 122 2724 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA) 2725 #define FF_PROFILE_H264_HIGH_444 144 2726 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244 2727 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA) 2728 #define FF_PROFILE_H264_CAVLC_444 44 2729 2730 #define FF_PROFILE_VC1_SIMPLE 0 2731 #define FF_PROFILE_VC1_MAIN 1 2732 #define FF_PROFILE_VC1_COMPLEX 2 2733 #define FF_PROFILE_VC1_ADVANCED 3 2734 2735 #define FF_PROFILE_MPEG4_SIMPLE 0 2736 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1 2737 #define FF_PROFILE_MPEG4_CORE 2 2738 #define FF_PROFILE_MPEG4_MAIN 3 2739 #define FF_PROFILE_MPEG4_N_BIT 4 2740 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5 2741 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6 2742 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7 2743 #define FF_PROFILE_MPEG4_HYBRID 8 2744 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9 2745 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10 2746 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11 2747 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12 2748 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13 2749 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14 2750 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15 2751 2752 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0 2753 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1 2754 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2 2755 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3 2756 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4 2757 2758 /** 2759 * level 2760 * - encoding: Set by user. 2761 * - decoding: Set by libavcodec. 2762 */ 2763 int level; 2764 #define FF_LEVEL_UNKNOWN -99 2765 2766 /** 2767 * Skip loop filtering for selected frames. 2768 * - encoding: unused 2769 * - decoding: Set by user. 2770 */ 2771 enum AVDiscard skip_loop_filter; 2772 2773 /** 2774 * Skip IDCT/dequantization for selected frames. 2775 * - encoding: unused 2776 * - decoding: Set by user. 2777 */ 2778 enum AVDiscard skip_idct; 2779 2780 /** 2781 * Skip decoding for selected frames. 2782 * - encoding: unused 2783 * - decoding: Set by user. 2784 */ 2785 enum AVDiscard skip_frame; 2786 2787 /** 2788 * Header containing style information for text subtitles. 2789 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS 2790 * [Script Info] and [V4+ Styles] section, plus the [Events] line and 2791 * the Format line following. It shouldn't include any Dialogue line. 2792 * - encoding: Set/allocated/freed by user (before avcodec_open2()) 2793 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2()) 2794 */ 2795 uint8_t *subtitle_header; 2796 int subtitle_header_size; 2797 2798 /** 2799 * Simulates errors in the bitstream to test error concealment. 2800 * - encoding: Set by user. 2801 * - decoding: unused 2802 */ 2803 int error_rate; 2804 2805 /** 2806 * Current packet as passed into the decoder, to avoid having 2807 * to pass the packet into every function. Currently only valid 2808 * inside lavc and get/release_buffer callbacks. 2809 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts 2810 * - encoding: unused 2811 */ 2812 AVPacket *pkt; 2813 2814 /** 2815 * VBV delay coded in the last frame (in periods of a 27 MHz clock). 2816 * Used for compliant TS muxing. 2817 * - encoding: Set by libavcodec. 2818 * - decoding: unused. 2819 */ 2820 uint64_t vbv_delay; 2821 2822 /** 2823 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are. 2824 * Code outside libavcodec should access this field using: 2825 * av_codec_{get,set}_pkt_timebase(avctx) 2826 * - encoding unused. 2827 * - decoding set by user. 2828 */ 2829 AVRational pkt_timebase; 2830 2831 /** 2832 * AVCodecDescriptor 2833 * Code outside libavcodec should access this field using: 2834 * av_codec_{get,set}_codec_descriptor(avctx) 2835 * - encoding: unused. 2836 * - decoding: set by libavcodec. 2837 */ 2838 const AVCodecDescriptor *codec_descriptor; 2839 2840 #if !FF_API_LOWRES 2841 /** 2842 * low resolution decoding, 1-> 1/2 size, 2->1/4 size 2843 * - encoding: unused 2844 * - decoding: Set by user. 2845 * Code outside libavcodec should access this field using: 2846 * av_codec_{get,set}_lowres(avctx) 2847 */ 2848 int lowres; 2849 #endif 2850 2851 /** 2852 * Current statistics for PTS correction. 2853 * - decoding: maintained and used by libavcodec, not intended to be used by user apps 2854 * - encoding: unused 2855 */ 2856 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far 2857 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far 2858 int64_t pts_correction_last_pts; /// PTS of the last frame 2859 int64_t pts_correction_last_dts; /// DTS of the last frame 2860 2861 /** 2862 * Character encoding of the input subtitles file. 2863 * - decoding: set by user 2864 * - encoding: unused 2865 */ 2866 char *sub_charenc; 2867 2868 /** 2869 * Subtitles character encoding mode. Formats or codecs might be adjusting 2870 * this setting (if they are doing the conversion themselves for instance). 2871 * - decoding: set by libavcodec 2872 * - encoding: unused 2873 */ 2874 int sub_charenc_mode; 2875 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance) 2876 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself 2877 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv 2878 2879 } AVCodecContext; 2880 2881 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx); 2882 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val); 2883 2884 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx); 2885 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc); 2886 2887 int av_codec_get_lowres(const AVCodecContext *avctx); 2888 void av_codec_set_lowres(AVCodecContext *avctx, int val); 2889 2890 /** 2891 * AVProfile. 2892 */ 2893 typedef struct AVProfile { 2894 int profile; 2895 const char *name; ///< short name for the profile 2896 } AVProfile; 2897 2898 typedef struct AVCodecDefault AVCodecDefault; 2899 2900 struct AVSubtitle; 2901 2902 /** 2903 * AVCodec. 2904 */ 2905 typedef struct AVCodec { 2906 /** 2907 * Name of the codec implementation. 2908 * The name is globally unique among encoders and among decoders (but an 2909 * encoder and a decoder can share the same name). 2910 * This is the primary way to find a codec from the user perspective. 2911 */ 2912 const char *name; 2913 /** 2914 * Descriptive name for the codec, meant to be more human readable than name. 2915 * You should use the NULL_IF_CONFIG_SMALL() macro to define it. 2916 */ 2917 const char *long_name; 2918 enum AVMediaType type; 2919 enum AVCodecID id; 2920 /** 2921 * Codec capabilities. 2922 * see CODEC_CAP_* 2923 */ 2924 int capabilities; 2925 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0} 2926 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1 2927 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0 2928 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1 2929 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0 2930 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder 2931 const AVClass *priv_class; ///< AVClass for the private context 2932 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} 2933 2934 /***************************************************************** 2935 * No fields below this line are part of the public API. They 2936 * may not be used outside of libavcodec and can be changed and 2937 * removed at will. 2938 * New public fields should be added right above. 2939 ***************************************************************** 2940 */ 2941 int priv_data_size; 2942 struct AVCodec *next; 2943 /** 2944 * @name Frame-level threading support functions 2945 * @{ 2946 */ 2947 /** 2948 * If defined, called on thread contexts when they are created. 2949 * If the codec allocates writable tables in init(), re-allocate them here. 2950 * priv_data will be set to a copy of the original. 2951 */ 2952 int (*init_thread_copy)(AVCodecContext *); 2953 /** 2954 * Copy necessary context variables from a previous thread context to the current one. 2955 * If not defined, the next thread will start automatically; otherwise, the codec 2956 * must call ff_thread_finish_setup(). 2957 * 2958 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped. 2959 */ 2960 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src); 2961 /** @} */ 2962 2963 /** 2964 * Private codec-specific defaults. 2965 */ 2966 const AVCodecDefault *defaults; 2967 2968 /** 2969 * Initialize codec static data, called from avcodec_register(). 2970 */ 2971 void (*init_static_data)(struct AVCodec *codec); 2972 2973 int (*init)(AVCodecContext *); 2974 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size, 2975 const struct AVSubtitle *sub); 2976 /** 2977 * Encode data to an AVPacket. 2978 * 2979 * @param avctx codec context 2980 * @param avpkt output AVPacket (may contain a user-provided buffer) 2981 * @param[in] frame AVFrame containing the raw data to be encoded 2982 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a 2983 * non-empty packet was returned in avpkt. 2984 * @return 0 on success, negative error code on failure 2985 */ 2986 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, 2987 int *got_packet_ptr); 2988 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt); 2989 int (*close)(AVCodecContext *); 2990 /** 2991 * Flush buffers. 2992 * Will be called when seeking 2993 */ 2994 void (*flush)(AVCodecContext *); 2995 } AVCodec; 2996 2997 /** 2998 * AVHWAccel. 2999 */ 3000 typedef struct AVHWAccel { 3001 /** 3002 * Name of the hardware accelerated codec. 3003 * The name is globally unique among encoders and among decoders (but an 3004 * encoder and a decoder can share the same name). 3005 */ 3006 const char *name; 3007 3008 /** 3009 * Type of codec implemented by the hardware accelerator. 3010 * 3011 * See AVMEDIA_TYPE_xxx 3012 */ 3013 enum AVMediaType type; 3014 3015 /** 3016 * Codec implemented by the hardware accelerator. 3017 * 3018 * See AV_CODEC_ID_xxx 3019 */ 3020 enum AVCodecID id; 3021 3022 /** 3023 * Supported pixel format. 3024 * 3025 * Only hardware accelerated formats are supported here. 3026 */ 3027 enum AVPixelFormat pix_fmt; 3028 3029 /** 3030 * Hardware accelerated codec capabilities. 3031 * see FF_HWACCEL_CODEC_CAP_* 3032 */ 3033 int capabilities; 3034 3035 struct AVHWAccel *next; 3036 3037 /** 3038 * Called at the beginning of each frame or field picture. 3039 * 3040 * Meaningful frame information (codec specific) is guaranteed to 3041 * be parsed at this point. This function is mandatory. 3042 * 3043 * Note that buf can be NULL along with buf_size set to 0. 3044 * Otherwise, this means the whole frame is available at this point. 3045 * 3046 * @param avctx the codec context 3047 * @param buf the frame data buffer base 3048 * @param buf_size the size of the frame in bytes 3049 * @return zero if successful, a negative value otherwise 3050 */ 3051 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); 3052 3053 /** 3054 * Callback for each slice. 3055 * 3056 * Meaningful slice information (codec specific) is guaranteed to 3057 * be parsed at this point. This function is mandatory. 3058 * 3059 * @param avctx the codec context 3060 * @param buf the slice data buffer base 3061 * @param buf_size the size of the slice in bytes 3062 * @return zero if successful, a negative value otherwise 3063 */ 3064 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); 3065 3066 /** 3067 * Called at the end of each frame or field picture. 3068 * 3069 * The whole picture is parsed at this point and can now be sent 3070 * to the hardware accelerator. This function is mandatory. 3071 * 3072 * @param avctx the codec context 3073 * @return zero if successful, a negative value otherwise 3074 */ 3075 int (*end_frame)(AVCodecContext *avctx); 3076 3077 /** 3078 * Size of HW accelerator private data. 3079 * 3080 * Private data is allocated with av_mallocz() before 3081 * AVCodecContext.get_buffer() and deallocated after 3082 * AVCodecContext.release_buffer(). 3083 */ 3084 int priv_data_size; 3085 } AVHWAccel; 3086 3087 /** 3088 * @defgroup lavc_picture AVPicture 3089 * 3090 * Functions for working with AVPicture 3091 * @{ 3092 */ 3093 3094 /** 3095 * four components are given, that's all. 3096 * the last component is alpha 3097 */ 3098 typedef struct AVPicture { 3099 uint8_t *data[AV_NUM_DATA_POINTERS]; 3100 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line 3101 } AVPicture; 3102 3103 /** 3104 * @} 3105 */ 3106 3107 enum AVSubtitleType { 3108 SUBTITLE_NONE, 3109 3110 SUBTITLE_BITMAP, ///< A bitmap, pict will be set 3111 3112 /** 3113 * Plain text, the text field must be set by the decoder and is 3114 * authoritative. ass and pict fields may contain approximations. 3115 */ 3116 SUBTITLE_TEXT, 3117 3118 /** 3119 * Formatted text, the ass field must be set by the decoder and is 3120 * authoritative. pict and text fields may contain approximations. 3121 */ 3122 SUBTITLE_ASS, 3123 }; 3124 3125 #define AV_SUBTITLE_FLAG_FORCED 0x00000001 3126 3127 typedef struct AVSubtitleRect { 3128 int x; ///< top left corner of pict, undefined when pict is not set 3129 int y; ///< top left corner of pict, undefined when pict is not set 3130 int w; ///< width of pict, undefined when pict is not set 3131 int h; ///< height of pict, undefined when pict is not set 3132 int nb_colors; ///< number of colors in pict, undefined when pict is not set 3133 3134 /** 3135 * data+linesize for the bitmap of this subtitle. 3136 * can be set for text/ass as well once they where rendered 3137 */ 3138 AVPicture pict; 3139 enum AVSubtitleType type; 3140 3141 char *text; ///< 0 terminated plain UTF-8 text 3142 3143 /** 3144 * 0 terminated ASS/SSA compatible event line. 3145 * The presentation of this is unaffected by the other values in this 3146 * struct. 3147 */ 3148 char *ass; 3149 3150 int flags; 3151 } AVSubtitleRect; 3152 3153 typedef struct AVSubtitle { 3154 uint16_t format; /* 0 = graphics */ 3155 uint32_t start_display_time; /* relative to packet pts, in ms */ 3156 uint32_t end_display_time; /* relative to packet pts, in ms */ 3157 unsigned num_rects; 3158 AVSubtitleRect **rects; 3159 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE 3160 } AVSubtitle; 3161 3162 /** 3163 * If c is NULL, returns the first registered codec, 3164 * if c is non-NULL, returns the next registered codec after c, 3165 * or NULL if c is the last one. 3166 */ 3167 AVCodec *av_codec_next(const AVCodec *c); 3168 3169 /** 3170 * Return the LIBAVCODEC_VERSION_INT constant. 3171 */ 3172 unsigned avcodec_version(void); 3173 3174 /** 3175 * Return the libavcodec build-time configuration. 3176 */ 3177 const char *avcodec_configuration(void); 3178 3179 /** 3180 * Return the libavcodec license. 3181 */ 3182 const char *avcodec_license(void); 3183 3184 /** 3185 * Register the codec codec and initialize libavcodec. 3186 * 3187 * @warning either this function or avcodec_register_all() must be called 3188 * before any other libavcodec functions. 3189 * 3190 * @see avcodec_register_all() 3191 */ 3192 void avcodec_register(AVCodec *codec); 3193 3194 /** 3195 * Register all the codecs, parsers and bitstream filters which were enabled at 3196 * configuration time. If you do not call this function you can select exactly 3197 * which formats you want to support, by using the individual registration 3198 * functions. 3199 * 3200 * @see avcodec_register 3201 * @see av_register_codec_parser 3202 * @see av_register_bitstream_filter 3203 */ 3204 void avcodec_register_all(void); 3205 3206 3207 #if FF_API_ALLOC_CONTEXT 3208 /** 3209 * Allocate an AVCodecContext and set its fields to default values. The 3210 * resulting struct can be deallocated by simply calling av_free(). 3211 * 3212 * @return An AVCodecContext filled with default values or NULL on failure. 3213 * @see avcodec_get_context_defaults 3214 * 3215 * @deprecated use avcodec_alloc_context3() 3216 */ 3217 attribute_deprecated 3218 AVCodecContext *avcodec_alloc_context(void); 3219 3220 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! 3221 * we WILL change its arguments and name a few times! */ 3222 attribute_deprecated 3223 AVCodecContext *avcodec_alloc_context2(enum AVMediaType); 3224 3225 /** 3226 * Set the fields of the given AVCodecContext to default values. 3227 * 3228 * @param s The AVCodecContext of which the fields should be set to default values. 3229 * @deprecated use avcodec_get_context_defaults3 3230 */ 3231 attribute_deprecated 3232 void avcodec_get_context_defaults(AVCodecContext *s); 3233 3234 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! 3235 * we WILL change its arguments and name a few times! */ 3236 attribute_deprecated 3237 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType); 3238 #endif 3239 3240 /** 3241 * Allocate an AVCodecContext and set its fields to default values. The 3242 * resulting struct can be deallocated by calling avcodec_close() on it followed 3243 * by av_free(). 3244 * 3245 * @param codec if non-NULL, allocate private data and initialize defaults 3246 * for the given codec. It is illegal to then call avcodec_open2() 3247 * with a different codec. 3248 * If NULL, then the codec-specific defaults won't be initialized, 3249 * which may result in suboptimal default settings (this is 3250 * important mainly for encoders, e.g. libx264). 3251 * 3252 * @return An AVCodecContext filled with default values or NULL on failure. 3253 * @see avcodec_get_context_defaults 3254 */ 3255 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec); 3256 3257 /** 3258 * Set the fields of the given AVCodecContext to default values corresponding 3259 * to the given codec (defaults may be codec-dependent). 3260 * 3261 * Do not call this function if a non-NULL codec has been passed 3262 * to avcodec_alloc_context3() that allocated this AVCodecContext. 3263 * If codec is non-NULL, it is illegal to call avcodec_open2() with a 3264 * different codec on this AVCodecContext. 3265 */ 3266 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec); 3267 3268 /** 3269 * Get the AVClass for AVCodecContext. It can be used in combination with 3270 * AV_OPT_SEARCH_FAKE_OBJ for examining options. 3271 * 3272 * @see av_opt_find(). 3273 */ 3274 const AVClass *avcodec_get_class(void); 3275 3276 /** 3277 * Get the AVClass for AVFrame. It can be used in combination with 3278 * AV_OPT_SEARCH_FAKE_OBJ for examining options. 3279 * 3280 * @see av_opt_find(). 3281 */ 3282 const AVClass *avcodec_get_frame_class(void); 3283 3284 /** 3285 * Get the AVClass for AVSubtitleRect. It can be used in combination with 3286 * AV_OPT_SEARCH_FAKE_OBJ for examining options. 3287 * 3288 * @see av_opt_find(). 3289 */ 3290 const AVClass *avcodec_get_subtitle_rect_class(void); 3291 3292 /** 3293 * Copy the settings of the source AVCodecContext into the destination 3294 * AVCodecContext. The resulting destination codec context will be 3295 * unopened, i.e. you are required to call avcodec_open2() before you 3296 * can use this AVCodecContext to decode/encode video/audio data. 3297 * 3298 * @param dest target codec context, should be initialized with 3299 * avcodec_alloc_context3(), but otherwise uninitialized 3300 * @param src source codec context 3301 * @return AVERROR() on error (e.g. memory allocation error), 0 on success 3302 */ 3303 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src); 3304 3305 /** 3306 * Allocate an AVFrame and set its fields to default values. The resulting 3307 * struct must be freed using avcodec_free_frame(). 3308 * 3309 * @return An AVFrame filled with default values or NULL on failure. 3310 * @see avcodec_get_frame_defaults 3311 */ 3312 AVFrame *avcodec_alloc_frame(void); 3313 3314 /** 3315 * Set the fields of the given AVFrame to default values. 3316 * 3317 * @param frame The AVFrame of which the fields should be set to default values. 3318 */ 3319 void avcodec_get_frame_defaults(AVFrame *frame); 3320 3321 /** 3322 * Free the frame and any dynamically allocated objects in it, 3323 * e.g. extended_data. 3324 * 3325 * @param frame frame to be freed. The pointer will be set to NULL. 3326 * 3327 * @warning this function does NOT free the data buffers themselves 3328 * (it does not know how, since they might have been allocated with 3329 * a custom get_buffer()). 3330 */ 3331 void avcodec_free_frame(AVFrame **frame); 3332 3333 #if FF_API_AVCODEC_OPEN 3334 /** 3335 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this 3336 * function the context has to be allocated. 3337 * 3338 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), 3339 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for 3340 * retrieving a codec. 3341 * 3342 * @warning This function is not thread safe! 3343 * 3344 * @code 3345 * avcodec_register_all(); 3346 * codec = avcodec_find_decoder(AV_CODEC_ID_H264); 3347 * if (!codec) 3348 * exit(1); 3349 * 3350 * context = avcodec_alloc_context3(codec); 3351 * 3352 * if (avcodec_open(context, codec) < 0) 3353 * exit(1); 3354 * @endcode 3355 * 3356 * @param avctx The context which will be set up to use the given codec. 3357 * @param codec The codec to use within the context. 3358 * @return zero on success, a negative value on error 3359 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close 3360 * 3361 * @deprecated use avcodec_open2 3362 */ 3363 attribute_deprecated 3364 int avcodec_open(AVCodecContext *avctx, AVCodec *codec); 3365 #endif 3366 3367 /** 3368 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this 3369 * function the context has to be allocated with avcodec_alloc_context3(). 3370 * 3371 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), 3372 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for 3373 * retrieving a codec. 3374 * 3375 * @warning This function is not thread safe! 3376 * 3377 * @code 3378 * avcodec_register_all(); 3379 * av_dict_set(&opts, "b", "2.5M", 0); 3380 * codec = avcodec_find_decoder(AV_CODEC_ID_H264); 3381 * if (!codec) 3382 * exit(1); 3383 * 3384 * context = avcodec_alloc_context3(codec); 3385 * 3386 * if (avcodec_open2(context, codec, opts) < 0) 3387 * exit(1); 3388 * @endcode 3389 * 3390 * @param avctx The context to initialize. 3391 * @param codec The codec to open this context for. If a non-NULL codec has been 3392 * previously passed to avcodec_alloc_context3() or 3393 * avcodec_get_context_defaults3() for this context, then this 3394 * parameter MUST be either NULL or equal to the previously passed 3395 * codec. 3396 * @param options A dictionary filled with AVCodecContext and codec-private options. 3397 * On return this object will be filled with options that were not found. 3398 * 3399 * @return zero on success, a negative value on error 3400 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(), 3401 * av_dict_set(), av_opt_find(). 3402 */ 3403 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options); 3404 3405 /** 3406 * Close a given AVCodecContext and free all the data associated with it 3407 * (but not the AVCodecContext itself). 3408 * 3409 * Calling this function on an AVCodecContext that hasn't been opened will free 3410 * the codec-specific data allocated in avcodec_alloc_context3() / 3411 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will 3412 * do nothing. 3413 */ 3414 int avcodec_close(AVCodecContext *avctx); 3415 3416 /** 3417 * Free all allocated data in the given subtitle struct. 3418 * 3419 * @param sub AVSubtitle to free. 3420 */ 3421 void avsubtitle_free(AVSubtitle *sub); 3422 3423 /** 3424 * @} 3425 */ 3426 3427 /** 3428 * @addtogroup lavc_packet 3429 * @{ 3430 */ 3431 3432 #if FF_API_DESTRUCT_PACKET 3433 /** 3434 * Default packet destructor. 3435 * @deprecated use the AVBuffer API instead 3436 */ 3437 attribute_deprecated 3438 void av_destruct_packet(AVPacket *pkt); 3439 #endif 3440 3441 /** 3442 * Initialize optional fields of a packet with default values. 3443 * 3444 * Note, this does not touch the data and size members, which have to be 3445 * initialized separately. 3446 * 3447 * @param pkt packet 3448 */ 3449 void av_init_packet(AVPacket *pkt); 3450 3451 /** 3452 * Allocate the payload of a packet and initialize its fields with 3453 * default values. 3454 * 3455 * @param pkt packet 3456 * @param size wanted payload size 3457 * @return 0 if OK, AVERROR_xxx otherwise 3458 */ 3459 int av_new_packet(AVPacket *pkt, int size); 3460 3461 /** 3462 * Reduce packet size, correctly zeroing padding 3463 * 3464 * @param pkt packet 3465 * @param size new size 3466 */ 3467 void av_shrink_packet(AVPacket *pkt, int size); 3468 3469 /** 3470 * Increase packet size, correctly zeroing padding 3471 * 3472 * @param pkt packet 3473 * @param grow_by number of bytes by which to increase the size of the packet 3474 */ 3475 int av_grow_packet(AVPacket *pkt, int grow_by); 3476 3477 /** 3478 * Initialize a reference-counted packet from av_malloc()ed data. 3479 * 3480 * @param pkt packet to be initialized. This function will set the data, size, 3481 * buf and destruct fields, all others are left untouched. 3482 * @param data Data allocated by av_malloc() to be used as packet data. If this 3483 * function returns successfully, the data is owned by the underlying AVBuffer. 3484 * The caller may not access the data through other means. 3485 * @param size size of data in bytes, without the padding. I.e. the full buffer 3486 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE. 3487 * 3488 * @return 0 on success, a negative AVERROR on error 3489 */ 3490 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size); 3491 3492 /** 3493 * @warning This is a hack - the packet memory allocation stuff is broken. The 3494 * packet is allocated if it was not really allocated. 3495 */ 3496 int av_dup_packet(AVPacket *pkt); 3497 3498 /** 3499 * Copy packet, including contents 3500 * 3501 * @return 0 on success, negative AVERROR on fail 3502 */ 3503 int av_copy_packet(AVPacket *dst, AVPacket *src); 3504 3505 /** 3506 * Copy packet side data 3507 * 3508 * @return 0 on success, negative AVERROR on fail 3509 */ 3510 int av_copy_packet_side_data(AVPacket *dst, AVPacket *src); 3511 3512 /** 3513 * Free a packet. 3514 * 3515 * @param pkt packet to free 3516 */ 3517 void av_free_packet(AVPacket *pkt); 3518 3519 /** 3520 * Allocate new information of a packet. 3521 * 3522 * @param pkt packet 3523 * @param type side information type 3524 * @param size side information size 3525 * @return pointer to fresh allocated data or NULL otherwise 3526 */ 3527 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, 3528 int size); 3529 3530 /** 3531 * Shrink the already allocated side data buffer 3532 * 3533 * @param pkt packet 3534 * @param type side information type 3535 * @param size new side information size 3536 * @return 0 on success, < 0 on failure 3537 */ 3538 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type, 3539 int size); 3540 3541 /** 3542 * Get side information from packet. 3543 * 3544 * @param pkt packet 3545 * @param type desired side information type 3546 * @param size pointer for side information size to store (optional) 3547 * @return pointer to data if present or NULL otherwise 3548 */ 3549 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, 3550 int *size); 3551 3552 int av_packet_merge_side_data(AVPacket *pkt); 3553 3554 int av_packet_split_side_data(AVPacket *pkt); 3555 3556 3557 /** 3558 * @} 3559 */ 3560 3561 /** 3562 * @addtogroup lavc_decoding 3563 * @{ 3564 */ 3565 3566 /** 3567 * Find a registered decoder with a matching codec ID. 3568 * 3569 * @param id AVCodecID of the requested decoder 3570 * @return A decoder if one was found, NULL otherwise. 3571 */ 3572 AVCodec *avcodec_find_decoder(enum AVCodecID id); 3573 3574 /** 3575 * Find a registered decoder with the specified name. 3576 * 3577 * @param name name of the requested decoder 3578 * @return A decoder if one was found, NULL otherwise. 3579 */ 3580 AVCodec *avcodec_find_decoder_by_name(const char *name); 3581 3582 #if FF_API_GET_BUFFER 3583 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic); 3584 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic); 3585 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic); 3586 #endif 3587 3588 /** 3589 * The default callback for AVCodecContext.get_buffer2(). It is made public so 3590 * it can be called by custom get_buffer2() implementations for decoders without 3591 * CODEC_CAP_DR1 set. 3592 */ 3593 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags); 3594 3595 /** 3596 * Return the amount of padding in pixels which the get_buffer callback must 3597 * provide around the edge of the image for codecs which do not have the 3598 * CODEC_FLAG_EMU_EDGE flag. 3599 * 3600 * @return Required padding in pixels. 3601 */ 3602 unsigned avcodec_get_edge_width(void); 3603 3604 /** 3605 * Modify width and height values so that they will result in a memory 3606 * buffer that is acceptable for the codec if you do not use any horizontal 3607 * padding. 3608 * 3609 * May only be used if a codec with CODEC_CAP_DR1 has been opened. 3610 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased 3611 * according to avcodec_get_edge_width() before. 3612 */ 3613 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height); 3614 3615 /** 3616 * Modify width and height values so that they will result in a memory 3617 * buffer that is acceptable for the codec if you also ensure that all 3618 * line sizes are a multiple of the respective linesize_align[i]. 3619 * 3620 * May only be used if a codec with CODEC_CAP_DR1 has been opened. 3621 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased 3622 * according to avcodec_get_edge_width() before. 3623 */ 3624 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, 3625 int linesize_align[AV_NUM_DATA_POINTERS]); 3626 3627 #if FF_API_OLD_DECODE_AUDIO 3628 /** 3629 * Wrapper function which calls avcodec_decode_audio4. 3630 * 3631 * @deprecated Use avcodec_decode_audio4 instead. 3632 * 3633 * Decode the audio frame of size avpkt->size from avpkt->data into samples. 3634 * Some decoders may support multiple frames in a single AVPacket, such 3635 * decoders would then just decode the first frame. In this case, 3636 * avcodec_decode_audio3 has to be called again with an AVPacket that contains 3637 * the remaining data in order to decode the second frame etc. 3638 * If no frame 3639 * could be outputted, frame_size_ptr is zero. Otherwise, it is the 3640 * decompressed frame size in bytes. 3641 * 3642 * @warning You must set frame_size_ptr to the allocated size of the 3643 * output buffer before calling avcodec_decode_audio3(). 3644 * 3645 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than 3646 * the actual read bytes because some optimized bitstream readers read 32 or 64 3647 * bits at once and could read over the end. 3648 * 3649 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that 3650 * no overreading happens for damaged MPEG streams. 3651 * 3652 * @warning You must not provide a custom get_buffer() when using 3653 * avcodec_decode_audio3(). Doing so will override it with 3654 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead, 3655 * which does allow the application to provide a custom get_buffer(). 3656 * 3657 * @note You might have to align the input buffer avpkt->data and output buffer 3658 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't 3659 * necessary at all, on others it won't work at all if not aligned and on others 3660 * it will work but it will have an impact on performance. 3661 * 3662 * In practice, avpkt->data should have 4 byte alignment at minimum and 3663 * samples should be 16 byte aligned unless the CPU doesn't need it 3664 * (AltiVec and SSE do). 3665 * 3666 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay 3667 * between input and output, these need to be fed with avpkt->data=NULL, 3668 * avpkt->size=0 at the end to return the remaining frames. 3669 * 3670 * @param avctx the codec context 3671 * @param[out] samples the output buffer, sample type in avctx->sample_fmt 3672 * If the sample format is planar, each channel plane will 3673 * be the same size, with no padding between channels. 3674 * @param[in,out] frame_size_ptr the output buffer size in bytes 3675 * @param[in] avpkt The input AVPacket containing the input buffer. 3676 * You can create such packet with av_init_packet() and by then setting 3677 * data and size, some decoders might in addition need other fields. 3678 * All decoders are designed to use the least fields possible though. 3679 * @return On error a negative value is returned, otherwise the number of bytes 3680 * used or zero if no frame data was decompressed (used) from the input AVPacket. 3681 */ 3682 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples, 3683 int *frame_size_ptr, 3684 AVPacket *avpkt); 3685 #endif 3686 3687 /** 3688 * Decode the audio frame of size avpkt->size from avpkt->data into frame. 3689 * 3690 * Some decoders may support multiple frames in a single AVPacket. Such 3691 * decoders would then just decode the first frame. In this case, 3692 * avcodec_decode_audio4 has to be called again with an AVPacket containing 3693 * the remaining data in order to decode the second frame, etc... 3694 * Even if no frames are returned, the packet needs to be fed to the decoder 3695 * with remaining data until it is completely consumed or an error occurs. 3696 * 3697 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE 3698 * larger than the actual read bytes because some optimized bitstream 3699 * readers read 32 or 64 bits at once and could read over the end. 3700 * 3701 * @note You might have to align the input buffer. The alignment requirements 3702 * depend on the CPU and the decoder. 3703 * 3704 * @param avctx the codec context 3705 * @param[out] frame The AVFrame in which to store decoded audio samples. 3706 * The decoder will allocate a buffer for the decoded frame by 3707 * calling the AVCodecContext.get_buffer2() callback. 3708 * When AVCodecContext.refcounted_frames is set to 1, the frame is 3709 * reference counted and the returned reference belongs to the 3710 * caller. The caller must release the frame using av_frame_unref() 3711 * when the frame is no longer needed. The caller may safely write 3712 * to the frame if av_frame_is_writable() returns 1. 3713 * When AVCodecContext.refcounted_frames is set to 0, the returned 3714 * reference belongs to the decoder and is valid only until the 3715 * next call to this function or until closing the decoder. 3716 * The caller may not write to it. 3717 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is 3718 * non-zero. 3719 * @param[in] avpkt The input AVPacket containing the input buffer. 3720 * At least avpkt->data and avpkt->size should be set. Some 3721 * decoders might also require additional fields to be set. 3722 * @return A negative error code is returned if an error occurred during 3723 * decoding, otherwise the number of bytes consumed from the input 3724 * AVPacket is returned. 3725 */ 3726 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, 3727 int *got_frame_ptr, const AVPacket *avpkt); 3728 3729 /** 3730 * Decode the video frame of size avpkt->size from avpkt->data into picture. 3731 * Some decoders may support multiple frames in a single AVPacket, such 3732 * decoders would then just decode the first frame. 3733 * 3734 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than 3735 * the actual read bytes because some optimized bitstream readers read 32 or 64 3736 * bits at once and could read over the end. 3737 * 3738 * @warning The end of the input buffer buf should be set to 0 to ensure that 3739 * no overreading happens for damaged MPEG streams. 3740 * 3741 * @note You might have to align the input buffer avpkt->data. 3742 * The alignment requirements depend on the CPU: on some CPUs it isn't 3743 * necessary at all, on others it won't work at all if not aligned and on others 3744 * it will work but it will have an impact on performance. 3745 * 3746 * In practice, avpkt->data should have 4 byte alignment at minimum. 3747 * 3748 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay 3749 * between input and output, these need to be fed with avpkt->data=NULL, 3750 * avpkt->size=0 at the end to return the remaining frames. 3751 * 3752 * @param avctx the codec context 3753 * @param[out] picture The AVFrame in which the decoded video frame will be stored. 3754 * Use av_frame_alloc() to get an AVFrame. The codec will 3755 * allocate memory for the actual bitmap by calling the 3756 * AVCodecContext.get_buffer2() callback. 3757 * When AVCodecContext.refcounted_frames is set to 1, the frame is 3758 * reference counted and the returned reference belongs to the 3759 * caller. The caller must release the frame using av_frame_unref() 3760 * when the frame is no longer needed. The caller may safely write 3761 * to the frame if av_frame_is_writable() returns 1. 3762 * When AVCodecContext.refcounted_frames is set to 0, the returned 3763 * reference belongs to the decoder and is valid only until the 3764 * next call to this function or until closing the decoder. The 3765 * caller may not write to it. 3766 * 3767 * @param[in] avpkt The input AVpacket containing the input buffer. 3768 * You can create such packet with av_init_packet() and by then setting 3769 * data and size, some decoders might in addition need other fields like 3770 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least 3771 * fields possible. 3772 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero. 3773 * @return On error a negative value is returned, otherwise the number of bytes 3774 * used or zero if no frame could be decompressed. 3775 */ 3776 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, 3777 int *got_picture_ptr, 3778 const AVPacket *avpkt); 3779 3780 /** 3781 * Decode a subtitle message. 3782 * Return a negative value on error, otherwise return the number of bytes used. 3783 * If no subtitle could be decompressed, got_sub_ptr is zero. 3784 * Otherwise, the subtitle is stored in *sub. 3785 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for 3786 * simplicity, because the performance difference is expect to be negligible 3787 * and reusing a get_buffer written for video codecs would probably perform badly 3788 * due to a potentially very different allocation pattern. 3789 * 3790 * @param avctx the codec context 3791 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be 3792 freed with avsubtitle_free if *got_sub_ptr is set. 3793 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero. 3794 * @param[in] avpkt The input AVPacket containing the input buffer. 3795 */ 3796 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, 3797 int *got_sub_ptr, 3798 AVPacket *avpkt); 3799 3800 /** 3801 * @defgroup lavc_parsing Frame parsing 3802 * @{ 3803 */ 3804 3805 enum AVPictureStructure { 3806 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown 3807 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field 3808 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field 3809 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame 3810 }; 3811 3812 typedef struct AVCodecParserContext { 3813 void *priv_data; 3814 struct AVCodecParser *parser; 3815 int64_t frame_offset; /* offset of the current frame */ 3816 int64_t cur_offset; /* current offset 3817 (incremented by each av_parser_parse()) */ 3818 int64_t next_frame_offset; /* offset of the next frame */ 3819 /* video info */ 3820 int pict_type; /* XXX: Put it back in AVCodecContext. */ 3821 /** 3822 * This field is used for proper frame duration computation in lavf. 3823 * It signals, how much longer the frame duration of the current frame 3824 * is compared to normal frame duration. 3825 * 3826 * frame_duration = (1 + repeat_pict) * time_base 3827 * 3828 * It is used by codecs like H.264 to display telecined material. 3829 */ 3830 int repeat_pict; /* XXX: Put it back in AVCodecContext. */ 3831 int64_t pts; /* pts of the current frame */ 3832 int64_t dts; /* dts of the current frame */ 3833 3834 /* private data */ 3835 int64_t last_pts; 3836 int64_t last_dts; 3837 int fetch_timestamp; 3838 3839 #define AV_PARSER_PTS_NB 4 3840 int cur_frame_start_index; 3841 int64_t cur_frame_offset[AV_PARSER_PTS_NB]; 3842 int64_t cur_frame_pts[AV_PARSER_PTS_NB]; 3843 int64_t cur_frame_dts[AV_PARSER_PTS_NB]; 3844 3845 int flags; 3846 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001 3847 #define PARSER_FLAG_ONCE 0x0002 3848 /// Set if the parser has a valid file offset 3849 #define PARSER_FLAG_FETCHED_OFFSET 0x0004 3850 #define PARSER_FLAG_USE_CODEC_TS 0x1000 3851 3852 int64_t offset; ///< byte offset from starting packet start 3853 int64_t cur_frame_end[AV_PARSER_PTS_NB]; 3854 3855 /** 3856 * Set by parser to 1 for key frames and 0 for non-key frames. 3857 * It is initialized to -1, so if the parser doesn't set this flag, 3858 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames 3859 * will be used. 3860 */ 3861 int key_frame; 3862 3863 /** 3864 * Time difference in stream time base units from the pts of this 3865 * packet to the point at which the output from the decoder has converged 3866 * independent from the availability of previous frames. That is, the 3867 * frames are virtually identical no matter if decoding started from 3868 * the very first frame or from this keyframe. 3869 * Is AV_NOPTS_VALUE if unknown. 3870 * This field is not the display duration of the current frame. 3871 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY 3872 * set. 3873 * 3874 * The purpose of this field is to allow seeking in streams that have no 3875 * keyframes in the conventional sense. It corresponds to the 3876 * recovery point SEI in H.264 and match_time_delta in NUT. It is also 3877 * essential for some types of subtitle streams to ensure that all 3878 * subtitles are correctly displayed after seeking. 3879 */ 3880 int64_t convergence_duration; 3881 3882 // Timestamp generation support: 3883 /** 3884 * Synchronization point for start of timestamp generation. 3885 * 3886 * Set to >0 for sync point, 0 for no sync point and <0 for undefined 3887 * (default). 3888 * 3889 * For example, this corresponds to presence of H.264 buffering period 3890 * SEI message. 3891 */ 3892 int dts_sync_point; 3893 3894 /** 3895 * Offset of the current timestamp against last timestamp sync point in 3896 * units of AVCodecContext.time_base. 3897 * 3898 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must 3899 * contain a valid timestamp offset. 3900 * 3901 * Note that the timestamp of sync point has usually a nonzero 3902 * dts_ref_dts_delta, which refers to the previous sync point. Offset of 3903 * the next frame after timestamp sync point will be usually 1. 3904 * 3905 * For example, this corresponds to H.264 cpb_removal_delay. 3906 */ 3907 int dts_ref_dts_delta; 3908 3909 /** 3910 * Presentation delay of current frame in units of AVCodecContext.time_base. 3911 * 3912 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must 3913 * contain valid non-negative timestamp delta (presentation time of a frame 3914 * must not lie in the past). 3915 * 3916 * This delay represents the difference between decoding and presentation 3917 * time of the frame. 3918 * 3919 * For example, this corresponds to H.264 dpb_output_delay. 3920 */ 3921 int pts_dts_delta; 3922 3923 /** 3924 * Position of the packet in file. 3925 * 3926 * Analogous to cur_frame_pts/dts 3927 */ 3928 int64_t cur_frame_pos[AV_PARSER_PTS_NB]; 3929 3930 /** 3931 * Byte position of currently parsed frame in stream. 3932 */ 3933 int64_t pos; 3934 3935 /** 3936 * Previous frame byte position. 3937 */ 3938 int64_t last_pos; 3939 3940 /** 3941 * Duration of the current frame. 3942 * For audio, this is in units of 1 / AVCodecContext.sample_rate. 3943 * For all other types, this is in units of AVCodecContext.time_base. 3944 */ 3945 int duration; 3946 3947 enum AVFieldOrder field_order; 3948 3949 /** 3950 * Indicate whether a picture is coded as a frame, top field or bottom field. 3951 * 3952 * For example, H.264 field_pic_flag equal to 0 corresponds to 3953 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag 3954 * equal to 1 and bottom_field_flag equal to 0 corresponds to 3955 * AV_PICTURE_STRUCTURE_TOP_FIELD. 3956 */ 3957 enum AVPictureStructure picture_structure; 3958 } AVCodecParserContext; 3959 3960 typedef struct AVCodecParser { 3961 int codec_ids[5]; /* several codec IDs are permitted */ 3962 int priv_data_size; 3963 int (*parser_init)(AVCodecParserContext *s); 3964 int (*parser_parse)(AVCodecParserContext *s, 3965 AVCodecContext *avctx, 3966 const uint8_t **poutbuf, int *poutbuf_size, 3967 const uint8_t *buf, int buf_size); 3968 void (*parser_close)(AVCodecParserContext *s); 3969 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size); 3970 struct AVCodecParser *next; 3971 } AVCodecParser; 3972 3973 AVCodecParser *av_parser_next(AVCodecParser *c); 3974 3975 void av_register_codec_parser(AVCodecParser *parser); 3976 AVCodecParserContext *av_parser_init(int codec_id); 3977 3978 /** 3979 * Parse a packet. 3980 * 3981 * @param s parser context. 3982 * @param avctx codec context. 3983 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished. 3984 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished. 3985 * @param buf input buffer. 3986 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output). 3987 * @param pts input presentation timestamp. 3988 * @param dts input decoding timestamp. 3989 * @param pos input byte position in stream. 3990 * @return the number of bytes of the input bitstream used. 3991 * 3992 * Example: 3993 * @code 3994 * while(in_len){ 3995 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size, 3996 * in_data, in_len, 3997 * pts, dts, pos); 3998 * in_data += len; 3999 * in_len -= len; 4000 * 4001 * if(size) 4002 * decode_frame(data, size); 4003 * } 4004 * @endcode 4005 */ 4006 int av_parser_parse2(AVCodecParserContext *s, 4007 AVCodecContext *avctx, 4008 uint8_t **poutbuf, int *poutbuf_size, 4009 const uint8_t *buf, int buf_size, 4010 int64_t pts, int64_t dts, 4011 int64_t pos); 4012 4013 /** 4014 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed 4015 * @deprecated use AVBitStreamFilter 4016 */ 4017 int av_parser_change(AVCodecParserContext *s, 4018 AVCodecContext *avctx, 4019 uint8_t **poutbuf, int *poutbuf_size, 4020 const uint8_t *buf, int buf_size, int keyframe); 4021 void av_parser_close(AVCodecParserContext *s); 4022 4023 /** 4024 * @} 4025 * @} 4026 */ 4027 4028 /** 4029 * @addtogroup lavc_encoding 4030 * @{ 4031 */ 4032 4033 /** 4034 * Find a registered encoder with a matching codec ID. 4035 * 4036 * @param id AVCodecID of the requested encoder 4037 * @return An encoder if one was found, NULL otherwise. 4038 */ 4039 AVCodec *avcodec_find_encoder(enum AVCodecID id); 4040 4041 /** 4042 * Find a registered encoder with the specified name. 4043 * 4044 * @param name name of the requested encoder 4045 * @return An encoder if one was found, NULL otherwise. 4046 */ 4047 AVCodec *avcodec_find_encoder_by_name(const char *name); 4048 4049 #if FF_API_OLD_ENCODE_AUDIO 4050 /** 4051 * Encode an audio frame from samples into buf. 4052 * 4053 * @deprecated Use avcodec_encode_audio2 instead. 4054 * 4055 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large. 4056 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user 4057 * will know how much space is needed because it depends on the value passed 4058 * in buf_size as described below. In that case a lower value can be used. 4059 * 4060 * @param avctx the codec context 4061 * @param[out] buf the output buffer 4062 * @param[in] buf_size the output buffer size 4063 * @param[in] samples the input buffer containing the samples 4064 * The number of samples read from this buffer is frame_size*channels, 4065 * both of which are defined in avctx. 4066 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of 4067 * samples read from samples is equal to: 4068 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id)) 4069 * This also implies that av_get_bits_per_sample() must not return 0 for these 4070 * codecs. 4071 * @return On error a negative value is returned, on success zero or the number 4072 * of bytes used to encode the data read from the input buffer. 4073 */ 4074 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx, 4075 uint8_t *buf, int buf_size, 4076 const short *samples); 4077 #endif 4078 4079 /** 4080 * Encode a frame of audio. 4081 * 4082 * Takes input samples from frame and writes the next output packet, if 4083 * available, to avpkt. The output packet does not necessarily contain data for 4084 * the most recent frame, as encoders can delay, split, and combine input frames 4085 * internally as needed. 4086 * 4087 * @param avctx codec context 4088 * @param avpkt output AVPacket. 4089 * The user can supply an output buffer by setting 4090 * avpkt->data and avpkt->size prior to calling the 4091 * function, but if the size of the user-provided data is not 4092 * large enough, encoding will fail. If avpkt->data and 4093 * avpkt->size are set, avpkt->destruct must also be set. All 4094 * other AVPacket fields will be reset by the encoder using 4095 * av_init_packet(). If avpkt->data is NULL, the encoder will 4096 * allocate it. The encoder will set avpkt->size to the size 4097 * of the output packet. 4098 * 4099 * If this function fails or produces no output, avpkt will be 4100 * freed using av_free_packet() (i.e. avpkt->destruct will be 4101 * called to free the user supplied buffer). 4102 * @param[in] frame AVFrame containing the raw audio data to be encoded. 4103 * May be NULL when flushing an encoder that has the 4104 * CODEC_CAP_DELAY capability set. 4105 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame 4106 * can have any number of samples. 4107 * If it is not set, frame->nb_samples must be equal to 4108 * avctx->frame_size for all frames except the last. 4109 * The final frame may be smaller than avctx->frame_size. 4110 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the 4111 * output packet is non-empty, and to 0 if it is 4112 * empty. If the function returns an error, the 4113 * packet can be assumed to be invalid, and the 4114 * value of got_packet_ptr is undefined and should 4115 * not be used. 4116 * @return 0 on success, negative error code on failure 4117 */ 4118 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, 4119 const AVFrame *frame, int *got_packet_ptr); 4120 4121 #if FF_API_OLD_ENCODE_VIDEO 4122 /** 4123 * @deprecated use avcodec_encode_video2() instead. 4124 * 4125 * Encode a video frame from pict into buf. 4126 * The input picture should be 4127 * stored using a specific format, namely avctx.pix_fmt. 4128 * 4129 * @param avctx the codec context 4130 * @param[out] buf the output buffer for the bitstream of encoded frame 4131 * @param[in] buf_size the size of the output buffer in bytes 4132 * @param[in] pict the input picture to encode 4133 * @return On error a negative value is returned, on success zero or the number 4134 * of bytes used from the output buffer. 4135 */ 4136 attribute_deprecated 4137 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 4138 const AVFrame *pict); 4139 #endif 4140 4141 /** 4142 * Encode a frame of video. 4143 * 4144 * Takes input raw video data from frame and writes the next output packet, if 4145 * available, to avpkt. The output packet does not necessarily contain data for 4146 * the most recent frame, as encoders can delay and reorder input frames 4147 * internally as needed. 4148 * 4149 * @param avctx codec context 4150 * @param avpkt output AVPacket. 4151 * The user can supply an output buffer by setting 4152 * avpkt->data and avpkt->size prior to calling the 4153 * function, but if the size of the user-provided data is not 4154 * large enough, encoding will fail. All other AVPacket fields 4155 * will be reset by the encoder using av_init_packet(). If 4156 * avpkt->data is NULL, the encoder will allocate it. 4157 * The encoder will set avpkt->size to the size of the 4158 * output packet. The returned data (if any) belongs to the 4159 * caller, he is responsible for freeing it. 4160 * 4161 * If this function fails or produces no output, avpkt will be 4162 * freed using av_free_packet() (i.e. avpkt->destruct will be 4163 * called to free the user supplied buffer). 4164 * @param[in] frame AVFrame containing the raw video data to be encoded. 4165 * May be NULL when flushing an encoder that has the 4166 * CODEC_CAP_DELAY capability set. 4167 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the 4168 * output packet is non-empty, and to 0 if it is 4169 * empty. If the function returns an error, the 4170 * packet can be assumed to be invalid, and the 4171 * value of got_packet_ptr is undefined and should 4172 * not be used. 4173 * @return 0 on success, negative error code on failure 4174 */ 4175 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, 4176 const AVFrame *frame, int *got_packet_ptr); 4177 4178 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, 4179 const AVSubtitle *sub); 4180 4181 4182 /** 4183 * @} 4184 */ 4185 4186 #if FF_API_AVCODEC_RESAMPLE 4187 /** 4188 * @defgroup lavc_resample Audio resampling 4189 * @ingroup libavc 4190 * @deprecated use libswresample instead 4191 * 4192 * @{ 4193 */ 4194 struct ReSampleContext; 4195 struct AVResampleContext; 4196 4197 typedef struct ReSampleContext ReSampleContext; 4198 4199 /** 4200 * Initialize audio resampling context. 4201 * 4202 * @param output_channels number of output channels 4203 * @param input_channels number of input channels 4204 * @param output_rate output sample rate 4205 * @param input_rate input sample rate 4206 * @param sample_fmt_out requested output sample format 4207 * @param sample_fmt_in input sample format 4208 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency 4209 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank 4210 * @param linear if 1 then the used FIR filter will be linearly interpolated 4211 between the 2 closest, if 0 the closest will be used 4212 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate 4213 * @return allocated ReSampleContext, NULL if error occurred 4214 */ 4215 attribute_deprecated 4216 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels, 4217 int output_rate, int input_rate, 4218 enum AVSampleFormat sample_fmt_out, 4219 enum AVSampleFormat sample_fmt_in, 4220 int filter_length, int log2_phase_count, 4221 int linear, double cutoff); 4222 4223 attribute_deprecated 4224 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples); 4225 4226 /** 4227 * Free resample context. 4228 * 4229 * @param s a non-NULL pointer to a resample context previously 4230 * created with av_audio_resample_init() 4231 */ 4232 attribute_deprecated 4233 void audio_resample_close(ReSampleContext *s); 4234 4235 4236 /** 4237 * Initialize an audio resampler. 4238 * Note, if either rate is not an integer then simply scale both rates up so they are. 4239 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq 4240 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank 4241 * @param linear If 1 then the used FIR filter will be linearly interpolated 4242 between the 2 closest, if 0 the closest will be used 4243 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate 4244 */ 4245 attribute_deprecated 4246 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff); 4247 4248 /** 4249 * Resample an array of samples using a previously configured context. 4250 * @param src an array of unconsumed samples 4251 * @param consumed the number of samples of src which have been consumed are returned here 4252 * @param src_size the number of unconsumed samples available 4253 * @param dst_size the amount of space in samples available in dst 4254 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context. 4255 * @return the number of samples written in dst or -1 if an error occurred 4256 */ 4257 attribute_deprecated 4258 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx); 4259 4260 4261 /** 4262 * Compensate samplerate/timestamp drift. The compensation is done by changing 4263 * the resampler parameters, so no audible clicks or similar distortions occur 4264 * @param compensation_distance distance in output samples over which the compensation should be performed 4265 * @param sample_delta number of output samples which should be output less 4266 * 4267 * example: av_resample_compensate(c, 10, 500) 4268 * here instead of 510 samples only 500 samples would be output 4269 * 4270 * note, due to rounding the actual compensation might be slightly different, 4271 * especially if the compensation_distance is large and the in_rate used during init is small 4272 */ 4273 attribute_deprecated 4274 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance); 4275 attribute_deprecated 4276 void av_resample_close(struct AVResampleContext *c); 4277 4278 /** 4279 * @} 4280 */ 4281 #endif 4282 4283 /** 4284 * @addtogroup lavc_picture 4285 * @{ 4286 */ 4287 4288 /** 4289 * Allocate memory for a picture. Call avpicture_free() to free it. 4290 * 4291 * @see avpicture_fill() 4292 * 4293 * @param picture the picture to be filled in 4294 * @param pix_fmt the format of the picture 4295 * @param width the width of the picture 4296 * @param height the height of the picture 4297 * @return zero if successful, a negative value if not 4298 */ 4299 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height); 4300 4301 /** 4302 * Free a picture previously allocated by avpicture_alloc(). 4303 * The data buffer used by the AVPicture is freed, but the AVPicture structure 4304 * itself is not. 4305 * 4306 * @param picture the AVPicture to be freed 4307 */ 4308 void avpicture_free(AVPicture *picture); 4309 4310 /** 4311 * Fill in the AVPicture fields, always assume a linesize alignment of 4312 * 1. 4313 * 4314 * @see av_image_fill_arrays() 4315 */ 4316 int avpicture_fill(AVPicture *picture, const uint8_t *ptr, 4317 enum AVPixelFormat pix_fmt, int width, int height); 4318 4319 /** 4320 * Copy pixel data from an AVPicture into a buffer, always assume a 4321 * linesize alignment of 1. 4322 * 4323 * @see av_image_copy_to_buffer() 4324 */ 4325 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt, 4326 int width, int height, 4327 unsigned char *dest, int dest_size); 4328 4329 /** 4330 * Calculate the size in bytes that a picture of the given width and height 4331 * would occupy if stored in the given picture format. 4332 * Always assume a linesize alignment of 1. 4333 * 4334 * @see av_image_get_buffer_size(). 4335 */ 4336 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height); 4337 4338 #if FF_API_DEINTERLACE 4339 /** 4340 * deinterlace - if not supported return -1 4341 * 4342 * @deprecated - use yadif (in libavfilter) instead 4343 */ 4344 attribute_deprecated 4345 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src, 4346 enum AVPixelFormat pix_fmt, int width, int height); 4347 #endif 4348 /** 4349 * Copy image src to dst. Wraps av_image_copy(). 4350 */ 4351 void av_picture_copy(AVPicture *dst, const AVPicture *src, 4352 enum AVPixelFormat pix_fmt, int width, int height); 4353 4354 /** 4355 * Crop image top and left side. 4356 */ 4357 int av_picture_crop(AVPicture *dst, const AVPicture *src, 4358 enum AVPixelFormat pix_fmt, int top_band, int left_band); 4359 4360 /** 4361 * Pad image. 4362 */ 4363 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, 4364 int padtop, int padbottom, int padleft, int padright, int *color); 4365 4366 /** 4367 * @} 4368 */ 4369 4370 /** 4371 * @defgroup lavc_misc Utility functions 4372 * @ingroup libavc 4373 * 4374 * Miscellaneous utility functions related to both encoding and decoding 4375 * (or neither). 4376 * @{ 4377 */ 4378 4379 /** 4380 * @defgroup lavc_misc_pixfmt Pixel formats 4381 * 4382 * Functions for working with pixel formats. 4383 * @{ 4384 */ 4385 4386 /** 4387 * Utility function to access log2_chroma_w log2_chroma_h from 4388 * the pixel format AVPixFmtDescriptor. 4389 * 4390 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample 4391 * for one that returns a failure code and continues in case of invalid 4392 * pix_fmts. 4393 * 4394 * @param[in] pix_fmt the pixel format 4395 * @param[out] h_shift store log2_chroma_w 4396 * @param[out] v_shift store log2_chroma_h 4397 * 4398 * @see av_pix_fmt_get_chroma_sub_sample 4399 */ 4400 4401 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift); 4402 4403 /** 4404 * Return a value representing the fourCC code associated to the 4405 * pixel format pix_fmt, or 0 if no associated fourCC code can be 4406 * found. 4407 */ 4408 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt); 4409 4410 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */ 4411 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */ 4412 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */ 4413 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */ 4414 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */ 4415 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */ 4416 4417 /** 4418 * Compute what kind of losses will occur when converting from one specific 4419 * pixel format to another. 4420 * When converting from one pixel format to another, information loss may occur. 4421 * For example, when converting from RGB24 to GRAY, the color information will 4422 * be lost. Similarly, other losses occur when converting from some formats to 4423 * other formats. These losses can involve loss of chroma, but also loss of 4424 * resolution, loss of color depth, loss due to the color space conversion, loss 4425 * of the alpha bits or loss due to color quantization. 4426 * avcodec_get_fix_fmt_loss() informs you about the various types of losses 4427 * which will occur when converting from one pixel format to another. 4428 * 4429 * @param[in] dst_pix_fmt destination pixel format 4430 * @param[in] src_pix_fmt source pixel format 4431 * @param[in] has_alpha Whether the source pixel format alpha channel is used. 4432 * @return Combination of flags informing you what kind of losses will occur 4433 * (maximum loss for an invalid dst_pix_fmt). 4434 */ 4435 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, 4436 int has_alpha); 4437 4438 /** 4439 * Find the best pixel format to convert to given a certain source pixel 4440 * format. When converting from one pixel format to another, information loss 4441 * may occur. For example, when converting from RGB24 to GRAY, the color 4442 * information will be lost. Similarly, other losses occur when converting from 4443 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of 4444 * the given pixel formats should be used to suffer the least amount of loss. 4445 * The pixel formats from which it chooses one, are determined by the 4446 * pix_fmt_list parameter. 4447 * 4448 * 4449 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from 4450 * @param[in] src_pix_fmt source pixel format 4451 * @param[in] has_alpha Whether the source pixel format alpha channel is used. 4452 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur. 4453 * @return The best pixel format to convert to or -1 if none was found. 4454 */ 4455 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(enum AVPixelFormat *pix_fmt_list, 4456 enum AVPixelFormat src_pix_fmt, 4457 int has_alpha, int *loss_ptr); 4458 4459 /** 4460 * Find the best pixel format to convert to given a certain source pixel 4461 * format and a selection of two destination pixel formats. When converting from 4462 * one pixel format to another, information loss may occur. For example, when converting 4463 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when 4464 * converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of 4465 * the given pixel formats should be used to suffer the least amount of loss. 4466 * 4467 * If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be 4468 * returned. 4469 * 4470 * @code 4471 * src_pix_fmt = AV_PIX_FMT_YUV420P; 4472 * dst_pix_fmt1= AV_PIX_FMT_RGB24; 4473 * dst_pix_fmt2= AV_PIX_FMT_GRAY8; 4474 * dst_pix_fmt3= AV_PIX_FMT_RGB8; 4475 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored. 4476 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss); 4477 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss); 4478 * @endcode 4479 * 4480 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from 4481 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from 4482 * @param[in] src_pix_fmt Source pixel format 4483 * @param[in] has_alpha Whether the source pixel format alpha channel is used. 4484 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e. 4485 * NULL or value of zero means we care about all losses. Out: the loss 4486 * that occurs when converting from src to selected dst pixel format. 4487 * @return The best pixel format to convert to or -1 if none was found. 4488 */ 4489 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, 4490 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); 4491 4492 attribute_deprecated 4493 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI 4494 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list, 4495 enum AVPixelFormat src_pix_fmt, 4496 int has_alpha, int *loss_ptr); 4497 #else 4498 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, 4499 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); 4500 #endif 4501 4502 4503 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt); 4504 4505 /** 4506 * @} 4507 */ 4508 4509 void avcodec_set_dimensions(AVCodecContext *s, int width, int height); 4510 4511 /** 4512 * Put a string representing the codec tag codec_tag in buf. 4513 * 4514 * @param buf_size size in bytes of buf 4515 * @return the length of the string that would have been generated if 4516 * enough space had been available, excluding the trailing null 4517 */ 4518 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag); 4519 4520 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode); 4521 4522 /** 4523 * Return a name for the specified profile, if available. 4524 * 4525 * @param codec the codec that is searched for the given profile 4526 * @param profile the profile value for which a name is requested 4527 * @return A name for the profile if found, NULL otherwise. 4528 */ 4529 const char *av_get_profile_name(const AVCodec *codec, int profile); 4530 4531 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size); 4532 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count); 4533 //FIXME func typedef 4534 4535 /** 4536 * Fill AVFrame audio data and linesize pointers. 4537 * 4538 * The buffer buf must be a preallocated buffer with a size big enough 4539 * to contain the specified samples amount. The filled AVFrame data 4540 * pointers will point to this buffer. 4541 * 4542 * AVFrame extended_data channel pointers are allocated if necessary for 4543 * planar audio. 4544 * 4545 * @param frame the AVFrame 4546 * frame->nb_samples must be set prior to calling the 4547 * function. This function fills in frame->data, 4548 * frame->extended_data, frame->linesize[0]. 4549 * @param nb_channels channel count 4550 * @param sample_fmt sample format 4551 * @param buf buffer to use for frame data 4552 * @param buf_size size of buffer 4553 * @param align plane size sample alignment (0 = default) 4554 * @return >=0 on success, negative error code on failure 4555 * @todo return the size in bytes required to store the samples in 4556 * case of success, at the next libavutil bump 4557 */ 4558 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, 4559 enum AVSampleFormat sample_fmt, const uint8_t *buf, 4560 int buf_size, int align); 4561 4562 /** 4563 * Flush buffers, should be called when seeking or when switching to a different stream. 4564 */ 4565 void avcodec_flush_buffers(AVCodecContext *avctx); 4566 4567 /** 4568 * Return codec bits per sample. 4569 * 4570 * @param[in] codec_id the codec 4571 * @return Number of bits per sample or zero if unknown for the given codec. 4572 */ 4573 int av_get_bits_per_sample(enum AVCodecID codec_id); 4574 4575 /** 4576 * Return the PCM codec associated with a sample format. 4577 * @param be endianness, 0 for little, 1 for big, 4578 * -1 (or anything else) for native 4579 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE 4580 */ 4581 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be); 4582 4583 /** 4584 * Return codec bits per sample. 4585 * Only return non-zero if the bits per sample is exactly correct, not an 4586 * approximation. 4587 * 4588 * @param[in] codec_id the codec 4589 * @return Number of bits per sample or zero if unknown for the given codec. 4590 */ 4591 int av_get_exact_bits_per_sample(enum AVCodecID codec_id); 4592 4593 /** 4594 * Return audio frame duration. 4595 * 4596 * @param avctx codec context 4597 * @param frame_bytes size of the frame, or 0 if unknown 4598 * @return frame duration, in samples, if known. 0 if not able to 4599 * determine. 4600 */ 4601 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes); 4602 4603 4604 typedef struct AVBitStreamFilterContext { 4605 void *priv_data; 4606 struct AVBitStreamFilter *filter; 4607 AVCodecParserContext *parser; 4608 struct AVBitStreamFilterContext *next; 4609 } AVBitStreamFilterContext; 4610 4611 4612 typedef struct AVBitStreamFilter { 4613 const char *name; 4614 int priv_data_size; 4615 int (*filter)(AVBitStreamFilterContext *bsfc, 4616 AVCodecContext *avctx, const char *args, 4617 uint8_t **poutbuf, int *poutbuf_size, 4618 const uint8_t *buf, int buf_size, int keyframe); 4619 void (*close)(AVBitStreamFilterContext *bsfc); 4620 struct AVBitStreamFilter *next; 4621 } AVBitStreamFilter; 4622 4623 /** 4624 * Register a bitstream filter. 4625 * 4626 * The filter will be accessible to the application code through 4627 * av_bitstream_filter_next() or can be directly initialized with 4628 * av_bitstream_filter_init(). 4629 * 4630 * @see avcodec_register_all() 4631 */ 4632 void av_register_bitstream_filter(AVBitStreamFilter *bsf); 4633 4634 /** 4635 * Create and initialize a bitstream filter context given a bitstream 4636 * filter name. 4637 * 4638 * The returned context must be freed with av_bitstream_filter_close(). 4639 * 4640 * @param name the name of the bitstream filter 4641 * @return a bitstream filter context if a matching filter was found 4642 * and successfully initialized, NULL otherwise 4643 */ 4644 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name); 4645 4646 /** 4647 * Filter bitstream. 4648 * 4649 * This function filters the buffer buf with size buf_size, and places the 4650 * filtered buffer in the buffer pointed to by poutbuf. 4651 * 4652 * The output buffer must be freed by the caller. 4653 * 4654 * @param bsfc bitstream filter context created by av_bitstream_filter_init() 4655 * @param avctx AVCodecContext accessed by the filter, may be NULL. 4656 * If specified, this must point to the encoder context of the 4657 * output stream the packet is sent to. 4658 * @param args arguments which specify the filter configuration, may be NULL 4659 * @param poutbuf pointer which is updated to point to the filtered buffer 4660 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes 4661 * @param buf buffer containing the data to filter 4662 * @param buf_size size in bytes of buf 4663 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data 4664 * @return >= 0 in case of success, or a negative error code in case of failure 4665 * 4666 * If the return value is positive, an output buffer is allocated and 4667 * is availble in *poutbuf, and is distinct from the input buffer. 4668 * 4669 * If the return value is 0, the output output buffer is not allocated 4670 * and the output buffer should be considered identical to the input 4671 * buffer, or in case *poutbuf was set it points to the input buffer 4672 * (not necessarily to its starting address). 4673 */ 4674 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, 4675 AVCodecContext *avctx, const char *args, 4676 uint8_t **poutbuf, int *poutbuf_size, 4677 const uint8_t *buf, int buf_size, int keyframe); 4678 4679 /** 4680 * Release bitstream filter context. 4681 * 4682 * @param bsf the bitstream filter context created with 4683 * av_bitstream_filter_init(), can be NULL 4684 */ 4685 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf); 4686 4687 /** 4688 * If f is NULL, return the first registered bitstream filter, 4689 * if f is non-NULL, return the next registered bitstream filter 4690 * after f, or NULL if f is the last one. 4691 * 4692 * This function can be used to iterate over all registered bitstream 4693 * filters. 4694 */ 4695 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f); 4696 4697 /* memory */ 4698 4699 /** 4700 * Reallocate the given block if it is not large enough, otherwise do nothing. 4701 * 4702 * @see av_realloc 4703 */ 4704 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size); 4705 4706 /** 4707 * Allocate a buffer, reusing the given one if large enough. 4708 * 4709 * Contrary to av_fast_realloc the current buffer contents might not be 4710 * preserved and on error the old buffer is freed, thus no special 4711 * handling to avoid memleaks is necessary. 4712 * 4713 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer 4714 * @param size size of the buffer *ptr points to 4715 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and 4716 * *size 0 if an error occurred. 4717 */ 4718 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size); 4719 4720 /** 4721 * Same behaviour av_fast_malloc but the buffer has additional 4722 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will will always be 0. 4723 * 4724 * In addition the whole buffer will initially and after resizes 4725 * be 0-initialized so that no uninitialized data will ever appear. 4726 */ 4727 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size); 4728 4729 /** 4730 * Same behaviour av_fast_padded_malloc except that buffer will always 4731 * be 0-initialized after call. 4732 */ 4733 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size); 4734 4735 /** 4736 * Encode extradata length to a buffer. Used by xiph codecs. 4737 * 4738 * @param s buffer to write to; must be at least (v/255+1) bytes long 4739 * @param v size of extradata in bytes 4740 * @return number of bytes written to the buffer. 4741 */ 4742 unsigned int av_xiphlacing(unsigned char *s, unsigned int v); 4743 4744 #if FF_API_MISSING_SAMPLE 4745 /** 4746 * Log a generic warning message about a missing feature. This function is 4747 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) 4748 * only, and would normally not be used by applications. 4749 * @param[in] avc a pointer to an arbitrary struct of which the first field is 4750 * a pointer to an AVClass struct 4751 * @param[in] feature string containing the name of the missing feature 4752 * @param[in] want_sample indicates if samples are wanted which exhibit this feature. 4753 * If want_sample is non-zero, additional verbage will be added to the log 4754 * message which tells the user how to report samples to the development 4755 * mailing list. 4756 * @deprecated Use avpriv_report_missing_feature() instead. 4757 */ 4758 attribute_deprecated 4759 void av_log_missing_feature(void *avc, const char *feature, int want_sample); 4760 4761 /** 4762 * Log a generic warning message asking for a sample. This function is 4763 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) 4764 * only, and would normally not be used by applications. 4765 * @param[in] avc a pointer to an arbitrary struct of which the first field is 4766 * a pointer to an AVClass struct 4767 * @param[in] msg string containing an optional message, or NULL if no message 4768 * @deprecated Use avpriv_request_sample() instead. 4769 */ 4770 attribute_deprecated 4771 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3); 4772 #endif /* FF_API_MISSING_SAMPLE */ 4773 4774 /** 4775 * Register the hardware accelerator hwaccel. 4776 */ 4777 void av_register_hwaccel(AVHWAccel *hwaccel); 4778 4779 /** 4780 * If hwaccel is NULL, returns the first registered hardware accelerator, 4781 * if hwaccel is non-NULL, returns the next registered hardware accelerator 4782 * after hwaccel, or NULL if hwaccel is the last one. 4783 */ 4784 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel); 4785 4786 4787 /** 4788 * Lock operation used by lockmgr 4789 */ 4790 enum AVLockOp { 4791 AV_LOCK_CREATE, ///< Create a mutex 4792 AV_LOCK_OBTAIN, ///< Lock the mutex 4793 AV_LOCK_RELEASE, ///< Unlock the mutex 4794 AV_LOCK_DESTROY, ///< Free mutex resources 4795 }; 4796 4797 /** 4798 * Register a user provided lock manager supporting the operations 4799 * specified by AVLockOp. mutex points to a (void *) where the 4800 * lockmgr should store/get a pointer to a user allocated mutex. It's 4801 * NULL upon AV_LOCK_CREATE and != NULL for all other ops. 4802 * 4803 * @param cb User defined callback. Note: FFmpeg may invoke calls to this 4804 * callback during the call to av_lockmgr_register(). 4805 * Thus, the application must be prepared to handle that. 4806 * If cb is set to NULL the lockmgr will be unregistered. 4807 * Also note that during unregistration the previously registered 4808 * lockmgr callback may also be invoked. 4809 */ 4810 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op)); 4811 4812 /** 4813 * Get the type of the given codec. 4814 */ 4815 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id); 4816 4817 /** 4818 * Get the name of a codec. 4819 * @return a static string identifying the codec; never NULL 4820 */ 4821 const char *avcodec_get_name(enum AVCodecID id); 4822 4823 /** 4824 * @return a positive value if s is open (i.e. avcodec_open2() was called on it 4825 * with no corresponding avcodec_close()), 0 otherwise. 4826 */ 4827 int avcodec_is_open(AVCodecContext *s); 4828 4829 /** 4830 * @return a non-zero number if codec is an encoder, zero otherwise 4831 */ 4832 int av_codec_is_encoder(const AVCodec *codec); 4833 4834 /** 4835 * @return a non-zero number if codec is a decoder, zero otherwise 4836 */ 4837 int av_codec_is_decoder(const AVCodec *codec); 4838 4839 /** 4840 * @return descriptor for given codec ID or NULL if no descriptor exists. 4841 */ 4842 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id); 4843 4844 /** 4845 * Iterate over all codec descriptors known to libavcodec. 4846 * 4847 * @param prev previous descriptor. NULL to get the first descriptor. 4848 * 4849 * @return next descriptor or NULL after the last descriptor 4850 */ 4851 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev); 4852 4853 /** 4854 * @return codec descriptor with the given name or NULL if no such descriptor 4855 * exists. 4856 */ 4857 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name); 4858 4859 /** 4860 * @} 4861 */ 4862 4863 #endif /* AVCODEC_AVCODEC_H */ 4864
