1 /* 2 * Copyright (c) 2012 The WebRTC 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 11 /* 12 * structs.h 13 * 14 * This header file contains all the structs used in the ISAC codec 15 * 16 */ 17 18 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_MAIN_SOURCE_STRUCTS_H_ 19 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_MAIN_SOURCE_STRUCTS_H_ 20 21 #include "webrtc/modules/audio_coding/codecs/isac/bandwidth_info.h" 22 #include "webrtc/modules/audio_coding/codecs/isac/main/include/isac.h" 23 #include "webrtc/modules/audio_coding/codecs/isac/main/source/settings.h" 24 #include "webrtc/typedefs.h" 25 26 typedef struct Bitstreamstruct { 27 28 uint8_t stream[STREAM_SIZE_MAX]; 29 uint32_t W_upper; 30 uint32_t streamval; 31 uint32_t stream_index; 32 33 } Bitstr; 34 35 typedef struct { 36 37 double DataBufferLo[WINLEN]; 38 double DataBufferHi[WINLEN]; 39 40 double CorrBufLo[ORDERLO+1]; 41 double CorrBufHi[ORDERHI+1]; 42 43 float PreStateLoF[ORDERLO+1]; 44 float PreStateLoG[ORDERLO+1]; 45 float PreStateHiF[ORDERHI+1]; 46 float PreStateHiG[ORDERHI+1]; 47 float PostStateLoF[ORDERLO+1]; 48 float PostStateLoG[ORDERLO+1]; 49 float PostStateHiF[ORDERHI+1]; 50 float PostStateHiG[ORDERHI+1]; 51 52 double OldEnergy; 53 54 } MaskFiltstr; 55 56 57 typedef struct { 58 59 //state vectors for each of the two analysis filters 60 double INSTAT1[2*(QORDER-1)]; 61 double INSTAT2[2*(QORDER-1)]; 62 double INSTATLA1[2*(QORDER-1)]; 63 double INSTATLA2[2*(QORDER-1)]; 64 double INLABUF1[QLOOKAHEAD]; 65 double INLABUF2[QLOOKAHEAD]; 66 67 float INSTAT1_float[2*(QORDER-1)]; 68 float INSTAT2_float[2*(QORDER-1)]; 69 float INSTATLA1_float[2*(QORDER-1)]; 70 float INSTATLA2_float[2*(QORDER-1)]; 71 float INLABUF1_float[QLOOKAHEAD]; 72 float INLABUF2_float[QLOOKAHEAD]; 73 74 /* High pass filter */ 75 double HPstates[HPORDER]; 76 float HPstates_float[HPORDER]; 77 78 } PreFiltBankstr; 79 80 81 typedef struct { 82 83 //state vectors for each of the two analysis filters 84 double STATE_0_LOWER[2*POSTQORDER]; 85 double STATE_0_UPPER[2*POSTQORDER]; 86 87 /* High pass filter */ 88 double HPstates1[HPORDER]; 89 double HPstates2[HPORDER]; 90 91 float STATE_0_LOWER_float[2*POSTQORDER]; 92 float STATE_0_UPPER_float[2*POSTQORDER]; 93 94 float HPstates1_float[HPORDER]; 95 float HPstates2_float[HPORDER]; 96 97 } PostFiltBankstr; 98 99 typedef struct { 100 101 //data buffer for pitch filter 102 double ubuf[PITCH_BUFFSIZE]; 103 104 //low pass state vector 105 double ystate[PITCH_DAMPORDER]; 106 107 //old lag and gain 108 double oldlagp[1]; 109 double oldgainp[1]; 110 111 } PitchFiltstr; 112 113 typedef struct { 114 115 //data buffer 116 double buffer[PITCH_WLPCBUFLEN]; 117 118 //state vectors 119 double istate[PITCH_WLPCORDER]; 120 double weostate[PITCH_WLPCORDER]; 121 double whostate[PITCH_WLPCORDER]; 122 123 //LPC window -> should be a global array because constant 124 double window[PITCH_WLPCWINLEN]; 125 126 } WeightFiltstr; 127 128 typedef struct { 129 130 //for inital estimator 131 double dec_buffer[PITCH_CORR_LEN2 + PITCH_CORR_STEP2 + 132 PITCH_MAX_LAG/2 - PITCH_FRAME_LEN/2+2]; 133 double decimator_state[2*ALLPASSSECTIONS+1]; 134 double hp_state[2]; 135 136 double whitened_buf[QLOOKAHEAD]; 137 138 double inbuf[QLOOKAHEAD]; 139 140 PitchFiltstr PFstr_wght; 141 PitchFiltstr PFstr; 142 WeightFiltstr Wghtstr; 143 144 } PitchAnalysisStruct; 145 146 147 148 /* Have instance of struct together with other iSAC structs */ 149 typedef struct { 150 151 /* Previous frame length (in ms) */ 152 int32_t prev_frame_length; 153 154 /* Previous RTP timestamp from received 155 packet (in samples relative beginning) */ 156 int32_t prev_rec_rtp_number; 157 158 /* Send timestamp for previous packet (in ms using timeGetTime()) */ 159 uint32_t prev_rec_send_ts; 160 161 /* Arrival time for previous packet (in ms using timeGetTime()) */ 162 uint32_t prev_rec_arr_ts; 163 164 /* rate of previous packet, derived from RTP timestamps (in bits/s) */ 165 float prev_rec_rtp_rate; 166 167 /* Time sinse the last update of the BN estimate (in ms) */ 168 uint32_t last_update_ts; 169 170 /* Time sinse the last reduction (in ms) */ 171 uint32_t last_reduction_ts; 172 173 /* How many times the estimate was update in the beginning */ 174 int32_t count_tot_updates_rec; 175 176 /* The estimated bottle neck rate from there to here (in bits/s) */ 177 int32_t rec_bw; 178 float rec_bw_inv; 179 float rec_bw_avg; 180 float rec_bw_avg_Q; 181 182 /* The estimated mean absolute jitter value, 183 as seen on this side (in ms) */ 184 float rec_jitter; 185 float rec_jitter_short_term; 186 float rec_jitter_short_term_abs; 187 float rec_max_delay; 188 float rec_max_delay_avg_Q; 189 190 /* (assumed) bitrate for headers (bps) */ 191 float rec_header_rate; 192 193 /* The estimated bottle neck rate from here to there (in bits/s) */ 194 float send_bw_avg; 195 196 /* The estimated mean absolute jitter value, as seen on 197 the other siee (in ms) */ 198 float send_max_delay_avg; 199 200 // number of packets received since last update 201 int num_pkts_rec; 202 203 int num_consec_rec_pkts_over_30k; 204 205 // flag for marking that a high speed network has been 206 // detected downstream 207 int hsn_detect_rec; 208 209 int num_consec_snt_pkts_over_30k; 210 211 // flag for marking that a high speed network has 212 // been detected upstream 213 int hsn_detect_snd; 214 215 uint32_t start_wait_period; 216 217 int in_wait_period; 218 219 int change_to_WB; 220 221 uint32_t senderTimestamp; 222 uint32_t receiverTimestamp; 223 //enum IsacSamplingRate incomingStreamSampFreq; 224 uint16_t numConsecLatePkts; 225 float consecLatency; 226 int16_t inWaitLatePkts; 227 228 IsacBandwidthInfo external_bw_info; 229 } BwEstimatorstr; 230 231 232 typedef struct { 233 234 /* boolean, flags if previous packet exceeded B.N. */ 235 int PrevExceed; 236 /* ms */ 237 int ExceedAgo; 238 /* packets left to send in current burst */ 239 int BurstCounter; 240 /* packets */ 241 int InitCounter; 242 /* ms remaining in buffer when next packet will be sent */ 243 double StillBuffered; 244 245 } RateModel; 246 247 248 typedef struct { 249 250 unsigned int SpaceAlloced; 251 unsigned int MaxPermAlloced; 252 double Tmp0[MAXFFTSIZE]; 253 double Tmp1[MAXFFTSIZE]; 254 double Tmp2[MAXFFTSIZE]; 255 double Tmp3[MAXFFTSIZE]; 256 int Perm[MAXFFTSIZE]; 257 int factor [NFACTOR]; 258 259 } FFTstr; 260 261 262 /* The following strutc is used to store data from encoding, to make it 263 fast and easy to construct a new bitstream with a different Bandwidth 264 estimate. All values (except framelength and minBytes) is double size to 265 handle 60 ms of data. 266 */ 267 typedef struct { 268 269 /* Used to keep track of if it is first or second part of 60 msec packet */ 270 int startIdx; 271 272 /* Frame length in samples */ 273 int16_t framelength; 274 275 /* Pitch Gain */ 276 int pitchGain_index[2]; 277 278 /* Pitch Lag */ 279 double meanGain[2]; 280 int pitchIndex[PITCH_SUBFRAMES*2]; 281 282 /* LPC */ 283 int LPCindex_s[108*2]; /* KLT_ORDER_SHAPE = 108 */ 284 int LPCindex_g[12*2]; /* KLT_ORDER_GAIN = 12 */ 285 double LPCcoeffs_lo[(ORDERLO+1)*SUBFRAMES*2]; 286 double LPCcoeffs_hi[(ORDERHI+1)*SUBFRAMES*2]; 287 288 /* Encode Spec */ 289 int16_t fre[FRAMESAMPLES]; 290 int16_t fim[FRAMESAMPLES]; 291 int16_t AvgPitchGain[2]; 292 293 /* Used in adaptive mode only */ 294 int minBytes; 295 296 } IsacSaveEncoderData; 297 298 299 typedef struct { 300 301 int indexLPCShape[UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME]; 302 double lpcGain[SUBFRAMES<<1]; 303 int lpcGainIndex[SUBFRAMES<<1]; 304 305 Bitstr bitStreamObj; 306 307 int16_t realFFT[FRAMESAMPLES_HALF]; 308 int16_t imagFFT[FRAMESAMPLES_HALF]; 309 } ISACUBSaveEncDataStruct; 310 311 312 313 typedef struct { 314 315 Bitstr bitstr_obj; 316 MaskFiltstr maskfiltstr_obj; 317 PreFiltBankstr prefiltbankstr_obj; 318 PitchFiltstr pitchfiltstr_obj; 319 PitchAnalysisStruct pitchanalysisstr_obj; 320 FFTstr fftstr_obj; 321 IsacSaveEncoderData SaveEnc_obj; 322 323 int buffer_index; 324 int16_t current_framesamples; 325 326 float data_buffer_float[FRAMESAMPLES_30ms]; 327 328 int frame_nb; 329 double bottleneck; 330 int16_t new_framelength; 331 double s2nr; 332 333 /* Maximum allowed number of bits for a 30 msec packet */ 334 int16_t payloadLimitBytes30; 335 /* Maximum allowed number of bits for a 30 msec packet */ 336 int16_t payloadLimitBytes60; 337 /* Maximum allowed number of bits for both 30 and 60 msec packet */ 338 int16_t maxPayloadBytes; 339 /* Maximum allowed rate in bytes per 30 msec packet */ 340 int16_t maxRateInBytes; 341 342 /*--- 343 If set to 1 iSAC will not addapt the frame-size, if used in 344 channel-adaptive mode. The initial value will be used for all rates. 345 ---*/ 346 int16_t enforceFrameSize; 347 348 /*----- 349 This records the BWE index the encoder injected into the bit-stream. 350 It will be used in RCU. The same BWE index of main payload will be in 351 the redundant payload. We can not retrive it from BWE because it is 352 a recursive procedure (WebRtcIsac_GetDownlinkBwJitIndexImpl) and has to be 353 called only once per each encode. 354 -----*/ 355 int16_t lastBWIdx; 356 } ISACLBEncStruct; 357 358 typedef struct { 359 360 Bitstr bitstr_obj; 361 MaskFiltstr maskfiltstr_obj; 362 PreFiltBankstr prefiltbankstr_obj; 363 FFTstr fftstr_obj; 364 ISACUBSaveEncDataStruct SaveEnc_obj; 365 366 int buffer_index; 367 float data_buffer_float[MAX_FRAMESAMPLES + 368 LB_TOTAL_DELAY_SAMPLES]; 369 double bottleneck; 370 /* Maximum allowed number of bits for a 30 msec packet */ 371 //int16_t payloadLimitBytes30; 372 /* Maximum allowed number of bits for both 30 and 60 msec packet */ 373 //int16_t maxPayloadBytes; 374 int16_t maxPayloadSizeBytes; 375 376 double lastLPCVec[UB_LPC_ORDER]; 377 int16_t numBytesUsed; 378 int16_t lastJitterInfo; 379 } ISACUBEncStruct; 380 381 382 383 typedef struct { 384 385 Bitstr bitstr_obj; 386 MaskFiltstr maskfiltstr_obj; 387 PostFiltBankstr postfiltbankstr_obj; 388 PitchFiltstr pitchfiltstr_obj; 389 FFTstr fftstr_obj; 390 391 } ISACLBDecStruct; 392 393 typedef struct { 394 395 Bitstr bitstr_obj; 396 MaskFiltstr maskfiltstr_obj; 397 PostFiltBankstr postfiltbankstr_obj; 398 FFTstr fftstr_obj; 399 400 } ISACUBDecStruct; 401 402 403 404 typedef struct { 405 406 ISACLBEncStruct ISACencLB_obj; 407 ISACLBDecStruct ISACdecLB_obj; 408 } ISACLBStruct; 409 410 411 typedef struct { 412 413 ISACUBEncStruct ISACencUB_obj; 414 ISACUBDecStruct ISACdecUB_obj; 415 } ISACUBStruct; 416 417 /* 418 This struct is used to take a snapshot of the entropy coder and LPC gains 419 right before encoding LPC gains. This allows us to go back to that state 420 if we like to limit the payload size. 421 */ 422 typedef struct { 423 /* 6 lower-band & 6 upper-band */ 424 double loFiltGain[SUBFRAMES]; 425 double hiFiltGain[SUBFRAMES]; 426 /* Upper boundary of interval W */ 427 uint32_t W_upper; 428 uint32_t streamval; 429 /* Index to the current position in bytestream */ 430 uint32_t stream_index; 431 uint8_t stream[3]; 432 } transcode_obj; 433 434 typedef struct { 435 // TODO(kwiberg): The size of these tables could be reduced by storing floats 436 // instead of doubles, and by making use of the identity cos(x) = 437 // sin(x+pi/2). They could also be made global constants that we fill in at 438 // compile time. 439 double costab1[FRAMESAMPLES_HALF]; 440 double sintab1[FRAMESAMPLES_HALF]; 441 double costab2[FRAMESAMPLES_QUARTER]; 442 double sintab2[FRAMESAMPLES_QUARTER]; 443 } TransformTables; 444 445 typedef struct { 446 // lower-band codec instance 447 ISACLBStruct instLB; 448 // upper-band codec instance 449 ISACUBStruct instUB; 450 451 // Bandwidth Estimator and model for the rate. 452 BwEstimatorstr bwestimator_obj; 453 RateModel rate_data_obj; 454 double MaxDelay; 455 456 /* 0 = adaptive; 1 = instantaneous */ 457 int16_t codingMode; 458 459 // overall bottleneck of the codec 460 int32_t bottleneck; 461 462 // QMF Filter state 463 int32_t analysisFBState1[FB_STATE_SIZE_WORD32]; 464 int32_t analysisFBState2[FB_STATE_SIZE_WORD32]; 465 int32_t synthesisFBState1[FB_STATE_SIZE_WORD32]; 466 int32_t synthesisFBState2[FB_STATE_SIZE_WORD32]; 467 468 // Error Code 469 int16_t errorCode; 470 471 // bandwidth of the encoded audio 8, 12 or 16 kHz 472 enum ISACBandwidth bandwidthKHz; 473 // Sampling rate of audio, encoder and decode, 8 or 16 kHz 474 enum IsacSamplingRate encoderSamplingRateKHz; 475 enum IsacSamplingRate decoderSamplingRateKHz; 476 // Flag to keep track of initializations, lower & upper-band 477 // encoder and decoder. 478 int16_t initFlag; 479 480 // Flag to to indicate signal bandwidth switch 481 int16_t resetFlag_8kHz; 482 483 // Maximum allowed rate, measured in Bytes per 30 ms. 484 int16_t maxRateBytesPer30Ms; 485 // Maximum allowed payload-size, measured in Bytes. 486 int16_t maxPayloadSizeBytes; 487 /* The expected sampling rate of the input signal. Valid values are 16000 488 * and 32000. This is not the operation sampling rate of the codec. */ 489 uint16_t in_sample_rate_hz; 490 491 // Trig tables for WebRtcIsac_Time2Spec and WebRtcIsac_Spec2time. 492 TransformTables transform_tables; 493 } ISACMainStruct; 494 495 #endif /* WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_MAIN_SOURCE_STRUCTS_H_ */ 496
