1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #ifndef VPX_ENCODER_H 11 #define VPX_ENCODER_H 12 13 /*!\defgroup encoder Encoder Algorithm Interface 14 * \ingroup codec 15 * This abstraction allows applications using this encoder to easily support 16 * multiple video formats with minimal code duplication. This section describes 17 * the interface common to all encoders. 18 * @{ 19 */ 20 21 /*!\file 22 * \brief Describes the encoder algorithm interface to applications. 23 * 24 * This file describes the interface between an application and a 25 * video encoder algorithm. 26 * 27 */ 28 #ifdef __cplusplus 29 extern "C" { 30 #endif 31 32 #include "vpx_codec.h" 33 34 /*! Temporal Scalability: Maximum length of the sequence defining frame 35 * layer membership 36 */ 37 #define VPX_TS_MAX_PERIODICITY 16 38 39 /*! Temporal Scalability: Maximum number of coding layers */ 40 #define VPX_TS_MAX_LAYERS 5 41 42 /*!\deprecated Use #VPX_TS_MAX_PERIODICITY instead. */ 43 #define MAX_PERIODICITY VPX_TS_MAX_PERIODICITY 44 45 /*!\deprecated Use #VPX_TS_MAX_LAYERS instead. */ 46 #define MAX_LAYERS VPX_TS_MAX_LAYERS 47 48 /*! Spatial Scalability: Maximum number of coding layers */ 49 #define VPX_SS_MAX_LAYERS 5 50 51 /*! Spatial Scalability: Default number of coding layers */ 52 #define VPX_SS_DEFAULT_LAYERS 3 53 54 /*!\brief Current ABI version number 55 * 56 * \internal 57 * If this file is altered in any way that changes the ABI, this value 58 * must be bumped. Examples include, but are not limited to, changing 59 * types, removing or reassigning enums, adding/removing/rearranging 60 * fields to structures 61 */ 62 #define VPX_ENCODER_ABI_VERSION (3 + VPX_CODEC_ABI_VERSION) /**<\hideinitializer*/ 63 64 65 /*! \brief Encoder capabilities bitfield 66 * 67 * Each encoder advertises the capabilities it supports as part of its 68 * ::vpx_codec_iface_t interface structure. Capabilities are extra 69 * interfaces or functionality, and are not required to be supported 70 * by an encoder. 71 * 72 * The available flags are specified by VPX_CODEC_CAP_* defines. 73 */ 74 #define VPX_CODEC_CAP_PSNR 0x10000 /**< Can issue PSNR packets */ 75 76 /*! Can output one partition at a time. Each partition is returned in its 77 * own VPX_CODEC_CX_FRAME_PKT, with the FRAME_IS_FRAGMENT flag set for 78 * every partition but the last. In this mode all frames are always 79 * returned partition by partition. 80 */ 81 #define VPX_CODEC_CAP_OUTPUT_PARTITION 0x20000 82 83 84 /*! \brief Initialization-time Feature Enabling 85 * 86 * Certain codec features must be known at initialization time, to allow 87 * for proper memory allocation. 88 * 89 * The available flags are specified by VPX_CODEC_USE_* defines. 90 */ 91 #define VPX_CODEC_USE_PSNR 0x10000 /**< Calculate PSNR on each frame */ 92 #define VPX_CODEC_USE_OUTPUT_PARTITION 0x20000 /**< Make the encoder output one 93 partition at a time. */ 94 95 96 /*!\brief Generic fixed size buffer structure 97 * 98 * This structure is able to hold a reference to any fixed size buffer. 99 */ 100 typedef struct vpx_fixed_buf { 101 void *buf; /**< Pointer to the data */ 102 size_t sz; /**< Length of the buffer, in chars */ 103 } vpx_fixed_buf_t; /**< alias for struct vpx_fixed_buf */ 104 105 106 /*!\brief Time Stamp Type 107 * 108 * An integer, which when multiplied by the stream's time base, provides 109 * the absolute time of a sample. 110 */ 111 typedef int64_t vpx_codec_pts_t; 112 113 114 /*!\brief Compressed Frame Flags 115 * 116 * This type represents a bitfield containing information about a compressed 117 * frame that may be useful to an application. The most significant 16 bits 118 * can be used by an algorithm to provide additional detail, for example to 119 * support frame types that are codec specific (MPEG-1 D-frames for example) 120 */ 121 typedef uint32_t vpx_codec_frame_flags_t; 122 #define VPX_FRAME_IS_KEY 0x1 /**< frame is the start of a GOP */ 123 #define VPX_FRAME_IS_DROPPABLE 0x2 /**< frame can be dropped without affecting 124 the stream (no future frame depends on 125 this one) */ 126 #define VPX_FRAME_IS_INVISIBLE 0x4 /**< frame should be decoded but will not 127 be shown */ 128 #define VPX_FRAME_IS_FRAGMENT 0x8 /**< this is a fragment of the encoded 129 frame */ 130 131 /*!\brief Error Resilient flags 132 * 133 * These flags define which error resilient features to enable in the 134 * encoder. The flags are specified through the 135 * vpx_codec_enc_cfg::g_error_resilient variable. 136 */ 137 typedef uint32_t vpx_codec_er_flags_t; 138 #define VPX_ERROR_RESILIENT_DEFAULT 0x1 /**< Improve resiliency against 139 losses of whole frames */ 140 #define VPX_ERROR_RESILIENT_PARTITIONS 0x2 /**< The frame partitions are 141 independently decodable by the 142 bool decoder, meaning that 143 partitions can be decoded even 144 though earlier partitions have 145 been lost. Note that intra 146 predicition is still done over 147 the partition boundary. */ 148 149 /*!\brief Encoder output packet variants 150 * 151 * This enumeration lists the different kinds of data packets that can be 152 * returned by calls to vpx_codec_get_cx_data(). Algorithms \ref MAY 153 * extend this list to provide additional functionality. 154 */ 155 enum vpx_codec_cx_pkt_kind { 156 VPX_CODEC_CX_FRAME_PKT, /**< Compressed video frame */ 157 VPX_CODEC_STATS_PKT, /**< Two-pass statistics for this frame */ 158 VPX_CODEC_PSNR_PKT, /**< PSNR statistics for this frame */ 159 VPX_CODEC_CUSTOM_PKT = 256 /**< Algorithm extensions */ 160 }; 161 162 163 /*!\brief Encoder output packet 164 * 165 * This structure contains the different kinds of output data the encoder 166 * may produce while compressing a frame. 167 */ 168 typedef struct vpx_codec_cx_pkt { 169 enum vpx_codec_cx_pkt_kind kind; /**< packet variant */ 170 union { 171 struct { 172 void *buf; /**< compressed data buffer */ 173 size_t sz; /**< length of compressed data */ 174 vpx_codec_pts_t pts; /**< time stamp to show frame 175 (in timebase units) */ 176 unsigned long duration; /**< duration to show frame 177 (in timebase units) */ 178 vpx_codec_frame_flags_t flags; /**< flags for this frame */ 179 int partition_id; /**< the partition id 180 defines the decoding order 181 of the partitions. Only 182 applicable when "output partition" 183 mode is enabled. First partition 184 has id 0.*/ 185 186 } frame; /**< data for compressed frame packet */ 187 struct vpx_fixed_buf twopass_stats; /**< data for two-pass packet */ 188 struct vpx_psnr_pkt { 189 unsigned int samples[4]; /**< Number of samples, total/y/u/v */ 190 uint64_t sse[4]; /**< sum squared error, total/y/u/v */ 191 double psnr[4]; /**< PSNR, total/y/u/v */ 192 } psnr; /**< data for PSNR packet */ 193 struct vpx_fixed_buf raw; /**< data for arbitrary packets */ 194 195 /* This packet size is fixed to allow codecs to extend this 196 * interface without having to manage storage for raw packets, 197 * i.e., if it's smaller than 128 bytes, you can store in the 198 * packet list directly. 199 */ 200 char pad[128 - sizeof(enum vpx_codec_cx_pkt_kind)]; /**< fixed sz */ 201 } data; /**< packet data */ 202 } vpx_codec_cx_pkt_t; /**< alias for struct vpx_codec_cx_pkt */ 203 204 205 /*!\brief Rational Number 206 * 207 * This structure holds a fractional value. 208 */ 209 typedef struct vpx_rational { 210 int num; /**< fraction numerator */ 211 int den; /**< fraction denominator */ 212 } vpx_rational_t; /**< alias for struct vpx_rational */ 213 214 215 /*!\brief Multi-pass Encoding Pass */ 216 enum vpx_enc_pass { 217 VPX_RC_ONE_PASS, /**< Single pass mode */ 218 VPX_RC_FIRST_PASS, /**< First pass of multi-pass mode */ 219 VPX_RC_LAST_PASS /**< Final pass of multi-pass mode */ 220 }; 221 222 223 /*!\brief Rate control mode */ 224 enum vpx_rc_mode { 225 VPX_VBR, /**< Variable Bit Rate (VBR) mode */ 226 VPX_CBR, /**< Constant Bit Rate (CBR) mode */ 227 VPX_CQ, /**< Constrained Quality (CQ) mode */ 228 VPX_Q, /**< Constant Quality (Q) mode */ 229 }; 230 231 232 /*!\brief Keyframe placement mode. 233 * 234 * This enumeration determines whether keyframes are placed automatically by 235 * the encoder or whether this behavior is disabled. Older releases of this 236 * SDK were implemented such that VPX_KF_FIXED meant keyframes were disabled. 237 * This name is confusing for this behavior, so the new symbols to be used 238 * are VPX_KF_AUTO and VPX_KF_DISABLED. 239 */ 240 enum vpx_kf_mode { 241 VPX_KF_FIXED, /**< deprecated, implies VPX_KF_DISABLED */ 242 VPX_KF_AUTO, /**< Encoder determines optimal placement automatically */ 243 VPX_KF_DISABLED = 0 /**< Encoder does not place keyframes. */ 244 }; 245 246 247 /*!\brief Encoded Frame Flags 248 * 249 * This type indicates a bitfield to be passed to vpx_codec_encode(), defining 250 * per-frame boolean values. By convention, bits common to all codecs will be 251 * named VPX_EFLAG_*, and bits specific to an algorithm will be named 252 * /algo/_eflag_*. The lower order 16 bits are reserved for common use. 253 */ 254 typedef long vpx_enc_frame_flags_t; 255 #define VPX_EFLAG_FORCE_KF (1<<0) /**< Force this frame to be a keyframe */ 256 257 258 /*!\brief Encoder configuration structure 259 * 260 * This structure contains the encoder settings that have common representations 261 * across all codecs. This doesn't imply that all codecs support all features, 262 * however. 263 */ 264 typedef struct vpx_codec_enc_cfg { 265 /* 266 * generic settings (g) 267 */ 268 269 /*!\brief Algorithm specific "usage" value 270 * 271 * Algorithms may define multiple values for usage, which may convey the 272 * intent of how the application intends to use the stream. If this value 273 * is non-zero, consult the documentation for the codec to determine its 274 * meaning. 275 */ 276 unsigned int g_usage; 277 278 279 /*!\brief Maximum number of threads to use 280 * 281 * For multi-threaded implementations, use no more than this number of 282 * threads. The codec may use fewer threads than allowed. The value 283 * 0 is equivalent to the value 1. 284 */ 285 unsigned int g_threads; 286 287 288 /*!\brief Bitstream profile to use 289 * 290 * Some codecs support a notion of multiple bitstream profiles. Typically 291 * this maps to a set of features that are turned on or off. Often the 292 * profile to use is determined by the features of the intended decoder. 293 * Consult the documentation for the codec to determine the valid values 294 * for this parameter, or set to zero for a sane default. 295 */ 296 unsigned int g_profile; /**< profile of bitstream to use */ 297 298 299 300 /*!\brief Width of the frame 301 * 302 * This value identifies the presentation resolution of the frame, 303 * in pixels. Note that the frames passed as input to the encoder must 304 * have this resolution. Frames will be presented by the decoder in this 305 * resolution, independent of any spatial resampling the encoder may do. 306 */ 307 unsigned int g_w; 308 309 310 /*!\brief Height of the frame 311 * 312 * This value identifies the presentation resolution of the frame, 313 * in pixels. Note that the frames passed as input to the encoder must 314 * have this resolution. Frames will be presented by the decoder in this 315 * resolution, independent of any spatial resampling the encoder may do. 316 */ 317 unsigned int g_h; 318 319 320 /*!\brief Stream timebase units 321 * 322 * Indicates the smallest interval of time, in seconds, used by the stream. 323 * For fixed frame rate material, or variable frame rate material where 324 * frames are timed at a multiple of a given clock (ex: video capture), 325 * the \ref RECOMMENDED method is to set the timebase to the reciprocal 326 * of the frame rate (ex: 1001/30000 for 29.970 Hz NTSC). This allows the 327 * pts to correspond to the frame number, which can be handy. For 328 * re-encoding video from containers with absolute time timestamps, the 329 * \ref RECOMMENDED method is to set the timebase to that of the parent 330 * container or multimedia framework (ex: 1/1000 for ms, as in FLV). 331 */ 332 struct vpx_rational g_timebase; 333 334 335 /*!\brief Enable error resilient modes. 336 * 337 * The error resilient bitfield indicates to the encoder which features 338 * it should enable to take measures for streaming over lossy or noisy 339 * links. 340 */ 341 vpx_codec_er_flags_t g_error_resilient; 342 343 344 /*!\brief Multi-pass Encoding Mode 345 * 346 * This value should be set to the current phase for multi-pass encoding. 347 * For single pass, set to #VPX_RC_ONE_PASS. 348 */ 349 enum vpx_enc_pass g_pass; 350 351 352 /*!\brief Allow lagged encoding 353 * 354 * If set, this value allows the encoder to consume a number of input 355 * frames before producing output frames. This allows the encoder to 356 * base decisions for the current frame on future frames. This does 357 * increase the latency of the encoding pipeline, so it is not appropriate 358 * in all situations (ex: realtime encoding). 359 * 360 * Note that this is a maximum value -- the encoder may produce frames 361 * sooner than the given limit. Set this value to 0 to disable this 362 * feature. 363 */ 364 unsigned int g_lag_in_frames; 365 366 367 /* 368 * rate control settings (rc) 369 */ 370 371 /*!\brief Temporal resampling configuration, if supported by the codec. 372 * 373 * Temporal resampling allows the codec to "drop" frames as a strategy to 374 * meet its target data rate. This can cause temporal discontinuities in 375 * the encoded video, which may appear as stuttering during playback. This 376 * trade-off is often acceptable, but for many applications is not. It can 377 * be disabled in these cases. 378 * 379 * Note that not all codecs support this feature. All vpx VPx codecs do. 380 * For other codecs, consult the documentation for that algorithm. 381 * 382 * This threshold is described as a percentage of the target data buffer. 383 * When the data buffer falls below this percentage of fullness, a 384 * dropped frame is indicated. Set the threshold to zero (0) to disable 385 * this feature. 386 */ 387 unsigned int rc_dropframe_thresh; 388 389 390 /*!\brief Enable/disable spatial resampling, if supported by the codec. 391 * 392 * Spatial resampling allows the codec to compress a lower resolution 393 * version of the frame, which is then upscaled by the encoder to the 394 * correct presentation resolution. This increases visual quality at 395 * low data rates, at the expense of CPU time on the encoder/decoder. 396 */ 397 unsigned int rc_resize_allowed; 398 399 400 /*!\brief Spatial resampling up watermark. 401 * 402 * This threshold is described as a percentage of the target data buffer. 403 * When the data buffer rises above this percentage of fullness, the 404 * encoder will step up to a higher resolution version of the frame. 405 */ 406 unsigned int rc_resize_up_thresh; 407 408 409 /*!\brief Spatial resampling down watermark. 410 * 411 * This threshold is described as a percentage of the target data buffer. 412 * When the data buffer falls below this percentage of fullness, the 413 * encoder will step down to a lower resolution version of the frame. 414 */ 415 unsigned int rc_resize_down_thresh; 416 417 418 /*!\brief Rate control algorithm to use. 419 * 420 * Indicates whether the end usage of this stream is to be streamed over 421 * a bandwidth constrained link, indicating that Constant Bit Rate (CBR) 422 * mode should be used, or whether it will be played back on a high 423 * bandwidth link, as from a local disk, where higher variations in 424 * bitrate are acceptable. 425 */ 426 enum vpx_rc_mode rc_end_usage; 427 428 429 /*!\brief Two-pass stats buffer. 430 * 431 * A buffer containing all of the stats packets produced in the first 432 * pass, concatenated. 433 */ 434 struct vpx_fixed_buf rc_twopass_stats_in; 435 436 437 /*!\brief Target data rate 438 * 439 * Target bandwidth to use for this stream, in kilobits per second. 440 */ 441 unsigned int rc_target_bitrate; 442 443 444 /* 445 * quantizer settings 446 */ 447 448 449 /*!\brief Minimum (Best Quality) Quantizer 450 * 451 * The quantizer is the most direct control over the quality of the 452 * encoded image. The range of valid values for the quantizer is codec 453 * specific. Consult the documentation for the codec to determine the 454 * values to use. To determine the range programmatically, call 455 * vpx_codec_enc_config_default() with a usage value of 0. 456 */ 457 unsigned int rc_min_quantizer; 458 459 460 /*!\brief Maximum (Worst Quality) Quantizer 461 * 462 * The quantizer is the most direct control over the quality of the 463 * encoded image. The range of valid values for the quantizer is codec 464 * specific. Consult the documentation for the codec to determine the 465 * values to use. To determine the range programmatically, call 466 * vpx_codec_enc_config_default() with a usage value of 0. 467 */ 468 unsigned int rc_max_quantizer; 469 470 471 /* 472 * bitrate tolerance 473 */ 474 475 476 /*!\brief Rate control adaptation undershoot control 477 * 478 * This value, expressed as a percentage of the target bitrate, 479 * controls the maximum allowed adaptation speed of the codec. 480 * This factor controls the maximum amount of bits that can 481 * be subtracted from the target bitrate in order to compensate 482 * for prior overshoot. 483 * 484 * Valid values in the range 0-1000. 485 */ 486 unsigned int rc_undershoot_pct; 487 488 489 /*!\brief Rate control adaptation overshoot control 490 * 491 * This value, expressed as a percentage of the target bitrate, 492 * controls the maximum allowed adaptation speed of the codec. 493 * This factor controls the maximum amount of bits that can 494 * be added to the target bitrate in order to compensate for 495 * prior undershoot. 496 * 497 * Valid values in the range 0-1000. 498 */ 499 unsigned int rc_overshoot_pct; 500 501 502 /* 503 * decoder buffer model parameters 504 */ 505 506 507 /*!\brief Decoder Buffer Size 508 * 509 * This value indicates the amount of data that may be buffered by the 510 * decoding application. Note that this value is expressed in units of 511 * time (milliseconds). For example, a value of 5000 indicates that the 512 * client will buffer (at least) 5000ms worth of encoded data. Use the 513 * target bitrate (#rc_target_bitrate) to convert to bits/bytes, if 514 * necessary. 515 */ 516 unsigned int rc_buf_sz; 517 518 519 /*!\brief Decoder Buffer Initial Size 520 * 521 * This value indicates the amount of data that will be buffered by the 522 * decoding application prior to beginning playback. This value is 523 * expressed in units of time (milliseconds). Use the target bitrate 524 * (#rc_target_bitrate) to convert to bits/bytes, if necessary. 525 */ 526 unsigned int rc_buf_initial_sz; 527 528 529 /*!\brief Decoder Buffer Optimal Size 530 * 531 * This value indicates the amount of data that the encoder should try 532 * to maintain in the decoder's buffer. This value is expressed in units 533 * of time (milliseconds). Use the target bitrate (#rc_target_bitrate) 534 * to convert to bits/bytes, if necessary. 535 */ 536 unsigned int rc_buf_optimal_sz; 537 538 539 /* 540 * 2 pass rate control parameters 541 */ 542 543 544 /*!\brief Two-pass mode CBR/VBR bias 545 * 546 * Bias, expressed on a scale of 0 to 100, for determining target size 547 * for the current frame. The value 0 indicates the optimal CBR mode 548 * value should be used. The value 100 indicates the optimal VBR mode 549 * value should be used. Values in between indicate which way the 550 * encoder should "lean." 551 */ 552 unsigned int rc_2pass_vbr_bias_pct; /**< RC mode bias between CBR and VBR(0-100: 0->CBR, 100->VBR) */ 553 554 555 /*!\brief Two-pass mode per-GOP minimum bitrate 556 * 557 * This value, expressed as a percentage of the target bitrate, indicates 558 * the minimum bitrate to be used for a single GOP (aka "section") 559 */ 560 unsigned int rc_2pass_vbr_minsection_pct; 561 562 563 /*!\brief Two-pass mode per-GOP maximum bitrate 564 * 565 * This value, expressed as a percentage of the target bitrate, indicates 566 * the maximum bitrate to be used for a single GOP (aka "section") 567 */ 568 unsigned int rc_2pass_vbr_maxsection_pct; 569 570 571 /* 572 * keyframing settings (kf) 573 */ 574 575 /*!\brief Keyframe placement mode 576 * 577 * This value indicates whether the encoder should place keyframes at a 578 * fixed interval, or determine the optimal placement automatically 579 * (as governed by the #kf_min_dist and #kf_max_dist parameters) 580 */ 581 enum vpx_kf_mode kf_mode; 582 583 584 /*!\brief Keyframe minimum interval 585 * 586 * This value, expressed as a number of frames, prevents the encoder from 587 * placing a keyframe nearer than kf_min_dist to the previous keyframe. At 588 * least kf_min_dist frames non-keyframes will be coded before the next 589 * keyframe. Set kf_min_dist equal to kf_max_dist for a fixed interval. 590 */ 591 unsigned int kf_min_dist; 592 593 594 /*!\brief Keyframe maximum interval 595 * 596 * This value, expressed as a number of frames, forces the encoder to code 597 * a keyframe if one has not been coded in the last kf_max_dist frames. 598 * A value of 0 implies all frames will be keyframes. Set kf_min_dist 599 * equal to kf_max_dist for a fixed interval. 600 */ 601 unsigned int kf_max_dist; 602 603 /* 604 * Spatial scalability settings (ss) 605 */ 606 607 /*!\brief Number of coding layers (spatial) 608 * 609 * This value specifies the number of coding layers to be used. 610 */ 611 unsigned int ss_number_layers; 612 613 /*!\brief Number of coding layers 614 * 615 * This value specifies the number of coding layers to be used. 616 */ 617 unsigned int ts_number_layers; 618 619 /*!\brief Target bitrate for each layer 620 * 621 * These values specify the target coding bitrate for each coding layer. 622 */ 623 unsigned int ts_target_bitrate[VPX_TS_MAX_LAYERS]; 624 625 /*!\brief Frame rate decimation factor for each layer 626 * 627 * These values specify the frame rate decimation factors to apply 628 * to each layer. 629 */ 630 unsigned int ts_rate_decimator[VPX_TS_MAX_LAYERS]; 631 632 /*!\brief Length of the sequence defining frame layer membership 633 * 634 * This value specifies the length of the sequence that defines the 635 * membership of frames to layers. For example, if ts_periodicity=8 then 636 * frames are assigned to coding layers with a repeated sequence of 637 * length 8. 638 */ 639 unsigned int ts_periodicity; 640 641 /*!\brief Template defining the membership of frames to coding layers 642 * 643 * This array defines the membership of frames to coding layers. For a 644 * 2-layer encoding that assigns even numbered frames to one layer (0) 645 * and odd numbered frames to a second layer (1) with ts_periodicity=8, 646 * then ts_layer_id = (0,1,0,1,0,1,0,1). 647 */ 648 unsigned int ts_layer_id[VPX_TS_MAX_PERIODICITY]; 649 } vpx_codec_enc_cfg_t; /**< alias for struct vpx_codec_enc_cfg */ 650 651 652 /*!\brief Initialize an encoder instance 653 * 654 * Initializes a encoder context using the given interface. Applications 655 * should call the vpx_codec_enc_init convenience macro instead of this 656 * function directly, to ensure that the ABI version number parameter 657 * is properly initialized. 658 * 659 * If the library was configured with --disable-multithread, this call 660 * is not thread safe and should be guarded with a lock if being used 661 * in a multithreaded context. 662 * 663 * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags 664 * parameter), the storage pointed to by the cfg parameter must be 665 * kept readable and stable until all memory maps have been set. 666 * 667 * \param[in] ctx Pointer to this instance's context. 668 * \param[in] iface Pointer to the algorithm interface to use. 669 * \param[in] cfg Configuration to use, if known. May be NULL. 670 * \param[in] flags Bitfield of VPX_CODEC_USE_* flags 671 * \param[in] ver ABI version number. Must be set to 672 * VPX_ENCODER_ABI_VERSION 673 * \retval #VPX_CODEC_OK 674 * The decoder algorithm initialized. 675 * \retval #VPX_CODEC_MEM_ERROR 676 * Memory allocation failed. 677 */ 678 vpx_codec_err_t vpx_codec_enc_init_ver(vpx_codec_ctx_t *ctx, 679 vpx_codec_iface_t *iface, 680 vpx_codec_enc_cfg_t *cfg, 681 vpx_codec_flags_t flags, 682 int ver); 683 684 685 /*!\brief Convenience macro for vpx_codec_enc_init_ver() 686 * 687 * Ensures the ABI version parameter is properly set. 688 */ 689 #define vpx_codec_enc_init(ctx, iface, cfg, flags) \ 690 vpx_codec_enc_init_ver(ctx, iface, cfg, flags, VPX_ENCODER_ABI_VERSION) 691 692 693 /*!\brief Initialize multi-encoder instance 694 * 695 * Initializes multi-encoder context using the given interface. 696 * Applications should call the vpx_codec_enc_init_multi convenience macro 697 * instead of this function directly, to ensure that the ABI version number 698 * parameter is properly initialized. 699 * 700 * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags 701 * parameter), the storage pointed to by the cfg parameter must be 702 * kept readable and stable until all memory maps have been set. 703 * 704 * \param[in] ctx Pointer to this instance's context. 705 * \param[in] iface Pointer to the algorithm interface to use. 706 * \param[in] cfg Configuration to use, if known. May be NULL. 707 * \param[in] num_enc Total number of encoders. 708 * \param[in] flags Bitfield of VPX_CODEC_USE_* flags 709 * \param[in] dsf Pointer to down-sampling factors. 710 * \param[in] ver ABI version number. Must be set to 711 * VPX_ENCODER_ABI_VERSION 712 * \retval #VPX_CODEC_OK 713 * The decoder algorithm initialized. 714 * \retval #VPX_CODEC_MEM_ERROR 715 * Memory allocation failed. 716 */ 717 vpx_codec_err_t vpx_codec_enc_init_multi_ver(vpx_codec_ctx_t *ctx, 718 vpx_codec_iface_t *iface, 719 vpx_codec_enc_cfg_t *cfg, 720 int num_enc, 721 vpx_codec_flags_t flags, 722 vpx_rational_t *dsf, 723 int ver); 724 725 726 /*!\brief Convenience macro for vpx_codec_enc_init_multi_ver() 727 * 728 * Ensures the ABI version parameter is properly set. 729 */ 730 #define vpx_codec_enc_init_multi(ctx, iface, cfg, num_enc, flags, dsf) \ 731 vpx_codec_enc_init_multi_ver(ctx, iface, cfg, num_enc, flags, dsf, \ 732 VPX_ENCODER_ABI_VERSION) 733 734 735 /*!\brief Get a default configuration 736 * 737 * Initializes a encoder configuration structure with default values. Supports 738 * the notion of "usages" so that an algorithm may offer different default 739 * settings depending on the user's intended goal. This function \ref SHOULD 740 * be called by all applications to initialize the configuration structure 741 * before specializing the configuration with application specific values. 742 * 743 * \param[in] iface Pointer to the algorithm interface to use. 744 * \param[out] cfg Configuration buffer to populate 745 * \param[in] usage End usage. Set to 0 or use codec specific values. 746 * 747 * \retval #VPX_CODEC_OK 748 * The configuration was populated. 749 * \retval #VPX_CODEC_INCAPABLE 750 * Interface is not an encoder interface. 751 * \retval #VPX_CODEC_INVALID_PARAM 752 * A parameter was NULL, or the usage value was not recognized. 753 */ 754 vpx_codec_err_t vpx_codec_enc_config_default(vpx_codec_iface_t *iface, 755 vpx_codec_enc_cfg_t *cfg, 756 unsigned int usage); 757 758 759 /*!\brief Set or change configuration 760 * 761 * Reconfigures an encoder instance according to the given configuration. 762 * 763 * \param[in] ctx Pointer to this instance's context 764 * \param[in] cfg Configuration buffer to use 765 * 766 * \retval #VPX_CODEC_OK 767 * The configuration was populated. 768 * \retval #VPX_CODEC_INCAPABLE 769 * Interface is not an encoder interface. 770 * \retval #VPX_CODEC_INVALID_PARAM 771 * A parameter was NULL, or the usage value was not recognized. 772 */ 773 vpx_codec_err_t vpx_codec_enc_config_set(vpx_codec_ctx_t *ctx, 774 const vpx_codec_enc_cfg_t *cfg); 775 776 777 /*!\brief Get global stream headers 778 * 779 * Retrieves a stream level global header packet, if supported by the codec. 780 * 781 * \param[in] ctx Pointer to this instance's context 782 * 783 * \retval NULL 784 * Encoder does not support global header 785 * \retval Non-NULL 786 * Pointer to buffer containing global header packet 787 */ 788 vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t *ctx); 789 790 791 #define VPX_DL_REALTIME (1) /**< deadline parameter analogous to 792 * VPx REALTIME mode. */ 793 #define VPX_DL_GOOD_QUALITY (1000000) /**< deadline parameter analogous to 794 * VPx GOOD QUALITY mode. */ 795 #define VPX_DL_BEST_QUALITY (0) /**< deadline parameter analogous to 796 * VPx BEST QUALITY mode. */ 797 /*!\brief Encode a frame 798 * 799 * Encodes a video frame at the given "presentation time." The presentation 800 * time stamp (PTS) \ref MUST be strictly increasing. 801 * 802 * The encoder supports the notion of a soft real-time deadline. Given a 803 * non-zero value to the deadline parameter, the encoder will make a "best 804 * effort" guarantee to return before the given time slice expires. It is 805 * implicit that limiting the available time to encode will degrade the 806 * output quality. The encoder can be given an unlimited time to produce the 807 * best possible frame by specifying a deadline of '0'. This deadline 808 * supercedes the VPx notion of "best quality, good quality, realtime". 809 * Applications that wish to map these former settings to the new deadline 810 * based system can use the symbols #VPX_DL_REALTIME, #VPX_DL_GOOD_QUALITY, 811 * and #VPX_DL_BEST_QUALITY. 812 * 813 * When the last frame has been passed to the encoder, this function should 814 * continue to be called, with the img parameter set to NULL. This will 815 * signal the end-of-stream condition to the encoder and allow it to encode 816 * any held buffers. Encoding is complete when vpx_codec_encode() is called 817 * and vpx_codec_get_cx_data() returns no data. 818 * 819 * \param[in] ctx Pointer to this instance's context 820 * \param[in] img Image data to encode, NULL to flush. 821 * \param[in] pts Presentation time stamp, in timebase units. 822 * \param[in] duration Duration to show frame, in timebase units. 823 * \param[in] flags Flags to use for encoding this frame. 824 * \param[in] deadline Time to spend encoding, in microseconds. (0=infinite) 825 * 826 * \retval #VPX_CODEC_OK 827 * The configuration was populated. 828 * \retval #VPX_CODEC_INCAPABLE 829 * Interface is not an encoder interface. 830 * \retval #VPX_CODEC_INVALID_PARAM 831 * A parameter was NULL, the image format is unsupported, etc. 832 */ 833 vpx_codec_err_t vpx_codec_encode(vpx_codec_ctx_t *ctx, 834 const vpx_image_t *img, 835 vpx_codec_pts_t pts, 836 unsigned long duration, 837 vpx_enc_frame_flags_t flags, 838 unsigned long deadline); 839 840 /*!\brief Set compressed data output buffer 841 * 842 * Sets the buffer that the codec should output the compressed data 843 * into. This call effectively sets the buffer pointer returned in the 844 * next VPX_CODEC_CX_FRAME_PKT packet. Subsequent packets will be 845 * appended into this buffer. The buffer is preserved across frames, 846 * so applications must periodically call this function after flushing 847 * the accumulated compressed data to disk or to the network to reset 848 * the pointer to the buffer's head. 849 * 850 * `pad_before` bytes will be skipped before writing the compressed 851 * data, and `pad_after` bytes will be appended to the packet. The size 852 * of the packet will be the sum of the size of the actual compressed 853 * data, pad_before, and pad_after. The padding bytes will be preserved 854 * (not overwritten). 855 * 856 * Note that calling this function does not guarantee that the returned 857 * compressed data will be placed into the specified buffer. In the 858 * event that the encoded data will not fit into the buffer provided, 859 * the returned packet \ref MAY point to an internal buffer, as it would 860 * if this call were never used. In this event, the output packet will 861 * NOT have any padding, and the application must free space and copy it 862 * to the proper place. This is of particular note in configurations 863 * that may output multiple packets for a single encoded frame (e.g., lagged 864 * encoding) or if the application does not reset the buffer periodically. 865 * 866 * Applications may restore the default behavior of the codec providing 867 * the compressed data buffer by calling this function with a NULL 868 * buffer. 869 * 870 * Applications \ref MUSTNOT call this function during iteration of 871 * vpx_codec_get_cx_data(). 872 * 873 * \param[in] ctx Pointer to this instance's context 874 * \param[in] buf Buffer to store compressed data into 875 * \param[in] pad_before Bytes to skip before writing compressed data 876 * \param[in] pad_after Bytes to skip after writing compressed data 877 * 878 * \retval #VPX_CODEC_OK 879 * The buffer was set successfully. 880 * \retval #VPX_CODEC_INVALID_PARAM 881 * A parameter was NULL, the image format is unsupported, etc. 882 */ 883 vpx_codec_err_t vpx_codec_set_cx_data_buf(vpx_codec_ctx_t *ctx, 884 const vpx_fixed_buf_t *buf, 885 unsigned int pad_before, 886 unsigned int pad_after); 887 888 889 /*!\brief Encoded data iterator 890 * 891 * Iterates over a list of data packets to be passed from the encoder to the 892 * application. The different kinds of packets available are enumerated in 893 * #vpx_codec_cx_pkt_kind. 894 * 895 * #VPX_CODEC_CX_FRAME_PKT packets should be passed to the application's 896 * muxer. Multiple compressed frames may be in the list. 897 * #VPX_CODEC_STATS_PKT packets should be appended to a global buffer. 898 * 899 * The application \ref MUST silently ignore any packet kinds that it does 900 * not recognize or support. 901 * 902 * The data buffers returned from this function are only guaranteed to be 903 * valid until the application makes another call to any vpx_codec_* function. 904 * 905 * \param[in] ctx Pointer to this instance's context 906 * \param[in,out] iter Iterator storage, initialized to NULL 907 * 908 * \return Returns a pointer to an output data packet (compressed frame data, 909 * two-pass statistics, etc.) or NULL to signal end-of-list. 910 * 911 */ 912 const vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t *ctx, 913 vpx_codec_iter_t *iter); 914 915 916 /*!\brief Get Preview Frame 917 * 918 * Returns an image that can be used as a preview. Shows the image as it would 919 * exist at the decompressor. The application \ref MUST NOT write into this 920 * image buffer. 921 * 922 * \param[in] ctx Pointer to this instance's context 923 * 924 * \return Returns a pointer to a preview image, or NULL if no image is 925 * available. 926 * 927 */ 928 const vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t *ctx); 929 930 931 /*!@} - end defgroup encoder*/ 932 #ifdef __cplusplus 933 } 934 #endif 935 #endif 936 937
