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 #include "webrtc_cng.h" 12 13 #include <string.h> 14 #include <stdlib.h> 15 16 #include "cng_helpfuns.h" 17 #include "signal_processing_library.h" 18 19 typedef struct WebRtcCngDecInst_t_ { 20 uint32_t dec_seed; 21 int32_t dec_target_energy; 22 int32_t dec_used_energy; 23 int16_t dec_target_reflCoefs[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 24 int16_t dec_used_reflCoefs[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 25 int16_t dec_filtstate[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 26 int16_t dec_filtstateLow[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 27 int16_t dec_Efiltstate[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 28 int16_t dec_EfiltstateLow[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 29 int16_t dec_order; 30 int16_t dec_target_scale_factor; /* Q29 */ 31 int16_t dec_used_scale_factor; /* Q29 */ 32 int16_t target_scale_factor; /* Q13 */ 33 int16_t errorcode; 34 int16_t initflag; 35 } WebRtcCngDecInst_t; 36 37 typedef struct WebRtcCngEncInst_t_ { 38 int16_t enc_nrOfCoefs; 39 uint16_t enc_sampfreq; 40 int16_t enc_interval; 41 int16_t enc_msSinceSID; 42 int32_t enc_Energy; 43 int16_t enc_reflCoefs[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 44 int32_t enc_corrVector[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 45 uint32_t enc_seed; 46 int16_t errorcode; 47 int16_t initflag; 48 } WebRtcCngEncInst_t; 49 50 const int32_t WebRtcCng_kDbov[94] = { 51 1081109975, 858756178, 682134279, 541838517, 430397633, 341876992, 52 271562548, 215709799, 171344384, 136103682, 108110997, 85875618, 53 68213428, 54183852, 43039763, 34187699, 27156255, 21570980, 54 17134438, 13610368, 10811100, 8587562, 6821343, 5418385, 55 4303976, 3418770, 2715625, 2157098, 1713444, 1361037, 56 1081110, 858756, 682134, 541839, 430398, 341877, 57 271563, 215710, 171344, 136104, 108111, 85876, 58 68213, 54184, 43040, 34188, 27156, 21571, 59 17134, 13610, 10811, 8588, 6821, 5418, 60 4304, 3419, 2716, 2157, 1713, 1361, 61 1081, 859, 682, 542, 430, 342, 62 272, 216, 171, 136, 108, 86, 63 68, 54, 43, 34, 27, 22, 64 17, 14, 11, 9, 7, 5, 65 4, 3, 3, 2, 2, 1, 66 1, 1, 1, 1 67 }; 68 69 const int16_t WebRtcCng_kCorrWindow[WEBRTC_CNG_MAX_LPC_ORDER] = { 70 32702, 32636, 32570, 32505, 32439, 32374, 71 32309, 32244, 32179, 32114, 32049, 31985 72 }; 73 74 /**************************************************************************** 75 * WebRtcCng_CreateEnc/Dec(...) 76 * 77 * These functions create an instance to the specified structure 78 * 79 * Input: 80 * - XXX_inst : Pointer to created instance that should be created 81 * 82 * Return value : 0 - Ok 83 * -1 - Error 84 */ 85 int16_t WebRtcCng_CreateEnc(CNG_enc_inst** cng_inst) { 86 if (cng_inst != NULL) { 87 *cng_inst = (CNG_enc_inst*) malloc(sizeof(WebRtcCngEncInst_t)); 88 if (*cng_inst != NULL) { 89 (*(WebRtcCngEncInst_t**) cng_inst)->errorcode = 0; 90 (*(WebRtcCngEncInst_t**) cng_inst)->initflag = 0; 91 92 /* Needed to get the right function pointers in SPLIB. */ 93 WebRtcSpl_Init(); 94 95 return 0; 96 } else { 97 /* The memory could not be allocated. */ 98 return -1; 99 } 100 } else { 101 /* The input pointer is invalid (NULL). */ 102 return -1; 103 } 104 } 105 106 int16_t WebRtcCng_CreateDec(CNG_dec_inst** cng_inst) { 107 if (cng_inst != NULL ) { 108 *cng_inst = (CNG_dec_inst*) malloc(sizeof(WebRtcCngDecInst_t)); 109 if (*cng_inst != NULL ) { 110 (*(WebRtcCngDecInst_t**) cng_inst)->errorcode = 0; 111 (*(WebRtcCngDecInst_t**) cng_inst)->initflag = 0; 112 113 /* Needed to get the right function pointers in SPLIB. */ 114 WebRtcSpl_Init(); 115 116 return 0; 117 } else { 118 /* The memory could not be allocated */ 119 return -1; 120 } 121 } else { 122 /* The input pointer is invalid (NULL). */ 123 return -1; 124 } 125 } 126 127 /**************************************************************************** 128 * WebRtcCng_InitEnc/Dec(...) 129 * 130 * This function initializes a instance 131 * 132 * Input: 133 * - cng_inst : Instance that should be initialized 134 * 135 * - fs : 8000 for narrowband and 16000 for wideband 136 * - interval : generate SID data every interval ms 137 * - quality : TBD 138 * 139 * Output: 140 * - cng_inst : Initialized instance 141 * 142 * Return value : 0 - Ok 143 * -1 - Error 144 */ 145 int16_t WebRtcCng_InitEnc(CNG_enc_inst* cng_inst, uint16_t fs, int16_t interval, 146 int16_t quality) { 147 int i; 148 WebRtcCngEncInst_t* inst = (WebRtcCngEncInst_t*) cng_inst; 149 memset(inst, 0, sizeof(WebRtcCngEncInst_t)); 150 151 /* Check LPC order */ 152 if (quality > WEBRTC_CNG_MAX_LPC_ORDER || quality <= 0) { 153 inst->errorcode = CNG_DISALLOWED_LPC_ORDER; 154 return -1; 155 } 156 157 inst->enc_sampfreq = fs; 158 inst->enc_interval = interval; 159 inst->enc_nrOfCoefs = quality; 160 inst->enc_msSinceSID = 0; 161 inst->enc_seed = 7777; /* For debugging only. */ 162 inst->enc_Energy = 0; 163 for (i = 0; i < (WEBRTC_CNG_MAX_LPC_ORDER + 1); i++) { 164 inst->enc_reflCoefs[i] = 0; 165 inst->enc_corrVector[i] = 0; 166 } 167 inst->initflag = 1; 168 169 return 0; 170 } 171 172 int16_t WebRtcCng_InitDec(CNG_dec_inst* cng_inst) { 173 int i; 174 175 WebRtcCngDecInst_t* inst = (WebRtcCngDecInst_t*) cng_inst; 176 177 memset(inst, 0, sizeof(WebRtcCngDecInst_t)); 178 inst->dec_seed = 7777; /* For debugging only. */ 179 inst->dec_order = 5; 180 inst->dec_target_scale_factor = 0; 181 inst->dec_used_scale_factor = 0; 182 for (i = 0; i < (WEBRTC_CNG_MAX_LPC_ORDER + 1); i++) { 183 inst->dec_filtstate[i] = 0; 184 inst->dec_target_reflCoefs[i] = 0; 185 inst->dec_used_reflCoefs[i] = 0; 186 } 187 inst->dec_target_reflCoefs[0] = 0; 188 inst->dec_used_reflCoefs[0] = 0; 189 inst->dec_used_energy = 0; 190 inst->initflag = 1; 191 192 return 0; 193 } 194 195 /**************************************************************************** 196 * WebRtcCng_FreeEnc/Dec(...) 197 * 198 * These functions frees the dynamic memory of a specified instance 199 * 200 * Input: 201 * - cng_inst : Pointer to created instance that should be freed 202 * 203 * Return value : 0 - Ok 204 * -1 - Error 205 */ 206 int16_t WebRtcCng_FreeEnc(CNG_enc_inst* cng_inst) { 207 free(cng_inst); 208 return 0; 209 } 210 211 int16_t WebRtcCng_FreeDec(CNG_dec_inst* cng_inst) { 212 free(cng_inst); 213 return 0; 214 } 215 216 /**************************************************************************** 217 * WebRtcCng_Encode(...) 218 * 219 * These functions analyzes background noise 220 * 221 * Input: 222 * - cng_inst : Pointer to created instance 223 * - speech : Signal (noise) to be analyzed 224 * - nrOfSamples : Size of speech vector 225 * - bytesOut : Nr of bytes to transmit, might be 0 226 * 227 * Return value : 0 - Ok 228 * -1 - Error 229 */ 230 int16_t WebRtcCng_Encode(CNG_enc_inst* cng_inst, int16_t* speech, 231 int16_t nrOfSamples, uint8_t* SIDdata, 232 int16_t* bytesOut, int16_t forceSID) { 233 WebRtcCngEncInst_t* inst = (WebRtcCngEncInst_t*) cng_inst; 234 235 int16_t arCoefs[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 236 int32_t corrVector[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 237 int16_t refCs[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 238 int16_t hanningW[WEBRTC_CNG_MAX_OUTSIZE_ORDER]; 239 int16_t ReflBeta = 19661; /* 0.6 in q15. */ 240 int16_t ReflBetaComp = 13107; /* 0.4 in q15. */ 241 int32_t outEnergy; 242 int outShifts; 243 int i, stab; 244 int acorrScale; 245 int index; 246 int16_t ind, factor; 247 int32_t* bptr; 248 int32_t blo, bhi; 249 int16_t negate; 250 const int16_t* aptr; 251 int16_t speechBuf[WEBRTC_CNG_MAX_OUTSIZE_ORDER]; 252 253 /* Check if encoder initiated. */ 254 if (inst->initflag != 1) { 255 inst->errorcode = CNG_ENCODER_NOT_INITIATED; 256 return -1; 257 } 258 259 /* Check framesize. */ 260 if (nrOfSamples > WEBRTC_CNG_MAX_OUTSIZE_ORDER) { 261 inst->errorcode = CNG_DISALLOWED_FRAME_SIZE; 262 return -1; 263 } 264 265 for (i = 0; i < nrOfSamples; i++) { 266 speechBuf[i] = speech[i]; 267 } 268 269 factor = nrOfSamples; 270 271 /* Calculate energy and a coefficients. */ 272 outEnergy = WebRtcSpl_Energy(speechBuf, nrOfSamples, &outShifts); 273 while (outShifts > 0) { 274 /* We can only do 5 shifts without destroying accuracy in 275 * division factor. */ 276 if (outShifts > 5) { 277 outEnergy <<= (outShifts - 5); 278 outShifts = 5; 279 } else { 280 factor /= 2; 281 outShifts--; 282 } 283 } 284 outEnergy = WebRtcSpl_DivW32W16(outEnergy, factor); 285 286 if (outEnergy > 1) { 287 /* Create Hanning Window. */ 288 WebRtcSpl_GetHanningWindow(hanningW, nrOfSamples / 2); 289 for (i = 0; i < (nrOfSamples / 2); i++) 290 hanningW[nrOfSamples - i - 1] = hanningW[i]; 291 292 WebRtcSpl_ElementwiseVectorMult(speechBuf, hanningW, speechBuf, nrOfSamples, 293 14); 294 295 WebRtcSpl_AutoCorrelation(speechBuf, nrOfSamples, inst->enc_nrOfCoefs, 296 corrVector, &acorrScale); 297 298 if (*corrVector == 0) 299 *corrVector = WEBRTC_SPL_WORD16_MAX; 300 301 /* Adds the bandwidth expansion. */ 302 aptr = WebRtcCng_kCorrWindow; 303 bptr = corrVector; 304 305 /* (zzz) lpc16_1 = 17+1+820+2+2 = 842 (ordo2=700). */ 306 for (ind = 0; ind < inst->enc_nrOfCoefs; ind++) { 307 /* The below code multiplies the 16 b corrWindow values (Q15) with 308 * the 32 b corrvector (Q0) and shifts the result down 15 steps. */ 309 negate = *bptr < 0; 310 if (negate) 311 *bptr = -*bptr; 312 313 blo = (int32_t) * aptr * (*bptr & 0xffff); 314 bhi = ((blo >> 16) & 0xffff) 315 + ((int32_t)(*aptr++) * ((*bptr >> 16) & 0xffff)); 316 blo = (blo & 0xffff) | ((bhi & 0xffff) << 16); 317 318 *bptr = (((bhi >> 16) & 0x7fff) << 17) | ((uint32_t) blo >> 15); 319 if (negate) 320 *bptr = -*bptr; 321 bptr++; 322 } 323 /* End of bandwidth expansion. */ 324 325 stab = WebRtcSpl_LevinsonDurbin(corrVector, arCoefs, refCs, 326 inst->enc_nrOfCoefs); 327 328 if (!stab) { 329 /* Disregard from this frame */ 330 *bytesOut = 0; 331 return 0; 332 } 333 334 } else { 335 for (i = 0; i < inst->enc_nrOfCoefs; i++) 336 refCs[i] = 0; 337 } 338 339 if (forceSID) { 340 /* Read instantaneous values instead of averaged. */ 341 for (i = 0; i < inst->enc_nrOfCoefs; i++) 342 inst->enc_reflCoefs[i] = refCs[i]; 343 inst->enc_Energy = outEnergy; 344 } else { 345 /* Average history with new values. */ 346 for (i = 0; i < (inst->enc_nrOfCoefs); i++) { 347 inst->enc_reflCoefs[i] = (int16_t) WEBRTC_SPL_MUL_16_16_RSFT( 348 inst->enc_reflCoefs[i], ReflBeta, 15); 349 inst->enc_reflCoefs[i] += (int16_t) WEBRTC_SPL_MUL_16_16_RSFT( 350 refCs[i], ReflBetaComp, 15); 351 } 352 inst->enc_Energy = (outEnergy >> 2) + (inst->enc_Energy >> 1) 353 + (inst->enc_Energy >> 2); 354 } 355 356 if (inst->enc_Energy < 1) { 357 inst->enc_Energy = 1; 358 } 359 360 if ((inst->enc_msSinceSID > (inst->enc_interval - 1)) || forceSID) { 361 362 /* Search for best dbov value. */ 363 index = 0; 364 for (i = 1; i < 93; i++) { 365 /* Always round downwards. */ 366 if ((inst->enc_Energy - WebRtcCng_kDbov[i]) > 0) { 367 index = i; 368 break; 369 } 370 } 371 if ((i == 93) && (index == 0)) 372 index = 94; 373 SIDdata[0] = index; 374 375 /* Quantize coefficients with tweak for WebRtc implementation of RFC3389. */ 376 if (inst->enc_nrOfCoefs == WEBRTC_CNG_MAX_LPC_ORDER) { 377 for (i = 0; i < inst->enc_nrOfCoefs; i++) { 378 /* Q15 to Q7 with rounding. */ 379 SIDdata[i + 1] = ((inst->enc_reflCoefs[i] + 128) >> 8); 380 } 381 } else { 382 for (i = 0; i < inst->enc_nrOfCoefs; i++) { 383 /* Q15 to Q7 with rounding. */ 384 SIDdata[i + 1] = (127 + ((inst->enc_reflCoefs[i] + 128) >> 8)); 385 } 386 } 387 388 inst->enc_msSinceSID = 0; 389 *bytesOut = inst->enc_nrOfCoefs + 1; 390 391 inst->enc_msSinceSID += (1000 * nrOfSamples) / inst->enc_sampfreq; 392 return inst->enc_nrOfCoefs + 1; 393 } else { 394 inst->enc_msSinceSID += (1000 * nrOfSamples) / inst->enc_sampfreq; 395 *bytesOut = 0; 396 return 0; 397 } 398 } 399 400 /**************************************************************************** 401 * WebRtcCng_UpdateSid(...) 402 * 403 * These functions updates the CN state, when a new SID packet arrives 404 * 405 * Input: 406 * - cng_inst : Pointer to created instance that should be freed 407 * - SID : SID packet, all headers removed 408 * - length : Length in bytes of SID packet 409 * 410 * Return value : 0 - Ok 411 * -1 - Error 412 */ 413 int16_t WebRtcCng_UpdateSid(CNG_dec_inst* cng_inst, uint8_t* SID, 414 int16_t length) { 415 416 WebRtcCngDecInst_t* inst = (WebRtcCngDecInst_t*) cng_inst; 417 int16_t refCs[WEBRTC_CNG_MAX_LPC_ORDER]; 418 int32_t targetEnergy; 419 int i; 420 421 if (inst->initflag != 1) { 422 inst->errorcode = CNG_DECODER_NOT_INITIATED; 423 return -1; 424 } 425 426 /* Throw away reflection coefficients of higher order than we can handle. */ 427 if (length > (WEBRTC_CNG_MAX_LPC_ORDER + 1)) 428 length = WEBRTC_CNG_MAX_LPC_ORDER + 1; 429 430 inst->dec_order = length - 1; 431 432 if (SID[0] > 93) 433 SID[0] = 93; 434 targetEnergy = WebRtcCng_kDbov[SID[0]]; 435 /* Take down target energy to 75%. */ 436 targetEnergy = targetEnergy >> 1; 437 targetEnergy += targetEnergy >> 2; 438 439 inst->dec_target_energy = targetEnergy; 440 441 /* Reconstruct coeffs with tweak for WebRtc implementation of RFC3389. */ 442 if (inst->dec_order == WEBRTC_CNG_MAX_LPC_ORDER) { 443 for (i = 0; i < (inst->dec_order); i++) { 444 refCs[i] = SID[i + 1] << 8; /* Q7 to Q15*/ 445 inst->dec_target_reflCoefs[i] = refCs[i]; 446 } 447 } else { 448 for (i = 0; i < (inst->dec_order); i++) { 449 refCs[i] = (SID[i + 1] - 127) << 8; /* Q7 to Q15. */ 450 inst->dec_target_reflCoefs[i] = refCs[i]; 451 } 452 } 453 454 for (i = (inst->dec_order); i < WEBRTC_CNG_MAX_LPC_ORDER; i++) { 455 refCs[i] = 0; 456 inst->dec_target_reflCoefs[i] = refCs[i]; 457 } 458 459 return 0; 460 } 461 462 /**************************************************************************** 463 * WebRtcCng_Generate(...) 464 * 465 * These functions generates CN data when needed 466 * 467 * Input: 468 * - cng_inst : Pointer to created instance that should be freed 469 * - outData : pointer to area to write CN data 470 * - nrOfSamples : How much data to generate 471 * 472 * Return value : 0 - Ok 473 * -1 - Error 474 */ 475 int16_t WebRtcCng_Generate(CNG_dec_inst* cng_inst, int16_t* outData, 476 int16_t nrOfSamples, int16_t new_period) { 477 WebRtcCngDecInst_t* inst = (WebRtcCngDecInst_t*) cng_inst; 478 479 int i; 480 int16_t excitation[WEBRTC_CNG_MAX_OUTSIZE_ORDER]; 481 int16_t low[WEBRTC_CNG_MAX_OUTSIZE_ORDER]; 482 int16_t lpPoly[WEBRTC_CNG_MAX_LPC_ORDER + 1]; 483 int16_t ReflBetaStd = 26214; /* 0.8 in q15. */ 484 int16_t ReflBetaCompStd = 6553; /* 0.2 in q15. */ 485 int16_t ReflBetaNewP = 19661; /* 0.6 in q15. */ 486 int16_t ReflBetaCompNewP = 13107; /* 0.4 in q15. */ 487 int16_t Beta, BetaC, tmp1, tmp2, tmp3; 488 int32_t targetEnergy; 489 int16_t En; 490 int16_t temp16; 491 492 if (nrOfSamples > WEBRTC_CNG_MAX_OUTSIZE_ORDER) { 493 inst->errorcode = CNG_DISALLOWED_FRAME_SIZE; 494 return -1; 495 } 496 497 if (new_period) { 498 inst->dec_used_scale_factor = inst->dec_target_scale_factor; 499 Beta = ReflBetaNewP; 500 BetaC = ReflBetaCompNewP; 501 } else { 502 Beta = ReflBetaStd; 503 BetaC = ReflBetaCompStd; 504 } 505 506 /* Here we use a 0.5 weighting, should possibly be modified to 0.6. */ 507 tmp1 = inst->dec_used_scale_factor << 2; /* Q13->Q15 */ 508 tmp2 = inst->dec_target_scale_factor << 2; /* Q13->Q15 */ 509 tmp3 = (int16_t) WEBRTC_SPL_MUL_16_16_RSFT(tmp1, Beta, 15); 510 tmp3 += (int16_t) WEBRTC_SPL_MUL_16_16_RSFT(tmp2, BetaC, 15); 511 inst->dec_used_scale_factor = tmp3 >> 2; /* Q15->Q13 */ 512 513 inst->dec_used_energy = inst->dec_used_energy >> 1; 514 inst->dec_used_energy += inst->dec_target_energy >> 1; 515 516 /* Do the same for the reflection coeffs. */ 517 for (i = 0; i < WEBRTC_CNG_MAX_LPC_ORDER; i++) { 518 inst->dec_used_reflCoefs[i] = (int16_t) WEBRTC_SPL_MUL_16_16_RSFT( 519 inst->dec_used_reflCoefs[i], Beta, 15); 520 inst->dec_used_reflCoefs[i] += (int16_t) WEBRTC_SPL_MUL_16_16_RSFT( 521 inst->dec_target_reflCoefs[i], BetaC, 15); 522 } 523 524 /* Compute the polynomial coefficients. */ 525 WebRtcCng_K2a16(inst->dec_used_reflCoefs, WEBRTC_CNG_MAX_LPC_ORDER, lpPoly); 526 527 528 targetEnergy = inst->dec_used_energy; 529 530 /* Calculate scaling factor based on filter energy. */ 531 En = 8192; /* 1.0 in Q13. */ 532 for (i = 0; i < (WEBRTC_CNG_MAX_LPC_ORDER); i++) { 533 534 /* Floating point value for reference. 535 E *= 1.0 - (inst->dec_used_reflCoefs[i] / 32768.0) * 536 (inst->dec_used_reflCoefs[i] / 32768.0); 537 */ 538 539 /* Same in fixed point. */ 540 /* K(i).^2 in Q15. */ 541 temp16 = (int16_t) WEBRTC_SPL_MUL_16_16_RSFT( 542 inst->dec_used_reflCoefs[i], inst->dec_used_reflCoefs[i], 15); 543 /* 1 - K(i).^2 in Q15. */ 544 temp16 = 0x7fff - temp16; 545 En = (int16_t) WEBRTC_SPL_MUL_16_16_RSFT(En, temp16, 15); 546 } 547 548 /* float scaling= sqrt(E * inst->dec_target_energy / (1 << 24)); */ 549 550 /* Calculate sqrt(En * target_energy / excitation energy) */ 551 targetEnergy = WebRtcSpl_Sqrt(inst->dec_used_energy); 552 553 En = (int16_t) WebRtcSpl_Sqrt(En) << 6; 554 En = (En * 3) >> 1; /* 1.5 estimates sqrt(2). */ 555 inst->dec_used_scale_factor = (int16_t)((En * targetEnergy) >> 12); 556 557 /* Generate excitation. */ 558 /* Excitation energy per sample is 2.^24 - Q13 N(0,1). */ 559 for (i = 0; i < nrOfSamples; i++) { 560 excitation[i] = WebRtcSpl_RandN(&inst->dec_seed) >> 1; 561 } 562 563 /* Scale to correct energy. */ 564 WebRtcSpl_ScaleVector(excitation, excitation, inst->dec_used_scale_factor, 565 nrOfSamples, 13); 566 567 /* |lpPoly| - Coefficients in Q12. 568 * |excitation| - Speech samples. 569 * |nst->dec_filtstate| - State preservation. 570 * |outData| - Filtered speech samples. */ 571 WebRtcSpl_FilterAR(lpPoly, WEBRTC_CNG_MAX_LPC_ORDER + 1, excitation, 572 nrOfSamples, inst->dec_filtstate, WEBRTC_CNG_MAX_LPC_ORDER, 573 inst->dec_filtstateLow, WEBRTC_CNG_MAX_LPC_ORDER, outData, 574 low, nrOfSamples); 575 576 return 0; 577 } 578 579 /**************************************************************************** 580 * WebRtcCng_GetErrorCodeEnc/Dec(...) 581 * 582 * This functions can be used to check the error code of a CNG instance. When 583 * a function returns -1 a error code will be set for that instance. The 584 * function below extract the code of the last error that occured in the 585 * specified instance. 586 * 587 * Input: 588 * - CNG_inst : CNG enc/dec instance 589 * 590 * Return value : Error code 591 */ 592 int16_t WebRtcCng_GetErrorCodeEnc(CNG_enc_inst* cng_inst) { 593 /* Typecast pointer to real structure. */ 594 WebRtcCngEncInst_t* inst = (WebRtcCngEncInst_t*) cng_inst; 595 return inst->errorcode; 596 } 597 598 int16_t WebRtcCng_GetErrorCodeDec(CNG_dec_inst* cng_inst) { 599 /* Typecast pointer to real structure. */ 600 WebRtcCngDecInst_t* inst = (WebRtcCngDecInst_t*) cng_inst; 601 return inst->errorcode; 602 } 603
