Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | |
| 2 | /****************************************************************** |
| 3 | |
| 4 | iLBC Speech Coder ANSI-C Source Code |
| 5 | |
| 6 | iLBC_decode.c |
| 7 | |
| 8 | Copyright (C) The Internet Society (2004). |
| 9 | All Rights Reserved. |
| 10 | |
| 11 | ******************************************************************/ |
| 12 | |
| 13 | #include <math.h> |
| 14 | #include <stdlib.h> |
| 15 | |
| 16 | #include "iLBC_define.h" |
| 17 | #include "StateConstructW.h" |
| 18 | #include "LPCdecode.h" |
| 19 | #include "iCBConstruct.h" |
| 20 | #include "doCPLC.h" |
| 21 | #include "helpfun.h" |
| 22 | #include "constants.h" |
| 23 | #include "packing.h" |
| 24 | #include "string.h" |
| 25 | #include "enhancer.h" |
| 26 | #include "hpOutput.h" |
| 27 | #include "syntFilter.h" |
| 28 | |
| 29 | /*----------------------------------------------------------------* |
| 30 | * Initiation of decoder instance. |
| 31 | *---------------------------------------------------------------*/ |
| 32 | |
| 33 | short initDecode( /* (o) Number of decoded |
| 34 | samples */ |
| 35 | iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) Decoder instance */ |
| 36 | int mode, /* (i) frame size mode */ |
| 37 | int use_enhancer /* (i) 1 to use enhancer |
| 38 | 0 to run without |
| 39 | enhancer */ |
| 40 | ){ |
| 41 | int i; |
| 42 | |
| 43 | iLBCdec_inst->mode = mode; |
| 44 | |
| 45 | |
| 46 | |
| 47 | |
| 48 | |
| 49 | if (mode==30) { |
| 50 | iLBCdec_inst->blockl = BLOCKL_30MS; |
| 51 | iLBCdec_inst->nsub = NSUB_30MS; |
| 52 | iLBCdec_inst->nasub = NASUB_30MS; |
| 53 | iLBCdec_inst->lpc_n = LPC_N_30MS; |
| 54 | iLBCdec_inst->no_of_bytes = NO_OF_BYTES_30MS; |
| 55 | iLBCdec_inst->no_of_words = NO_OF_WORDS_30MS; |
| 56 | iLBCdec_inst->state_short_len=STATE_SHORT_LEN_30MS; |
| 57 | /* ULP init */ |
| 58 | iLBCdec_inst->ULP_inst=&ULP_30msTbl; |
| 59 | } |
| 60 | else if (mode==20) { |
| 61 | iLBCdec_inst->blockl = BLOCKL_20MS; |
| 62 | iLBCdec_inst->nsub = NSUB_20MS; |
| 63 | iLBCdec_inst->nasub = NASUB_20MS; |
| 64 | iLBCdec_inst->lpc_n = LPC_N_20MS; |
| 65 | iLBCdec_inst->no_of_bytes = NO_OF_BYTES_20MS; |
| 66 | iLBCdec_inst->no_of_words = NO_OF_WORDS_20MS; |
| 67 | iLBCdec_inst->state_short_len=STATE_SHORT_LEN_20MS; |
| 68 | /* ULP init */ |
| 69 | iLBCdec_inst->ULP_inst=&ULP_20msTbl; |
| 70 | } |
| 71 | else { |
| 72 | exit(2); |
| 73 | } |
| 74 | |
| 75 | memset(iLBCdec_inst->syntMem, 0, |
| 76 | LPC_FILTERORDER*sizeof(float)); |
| 77 | memcpy((*iLBCdec_inst).lsfdeqold, lsfmeanTbl, |
| 78 | LPC_FILTERORDER*sizeof(float)); |
| 79 | |
| 80 | memset(iLBCdec_inst->old_syntdenum, 0, |
| 81 | ((LPC_FILTERORDER + 1)*NSUB_MAX)*sizeof(float)); |
| 82 | for (i=0; i<NSUB_MAX; i++) |
| 83 | iLBCdec_inst->old_syntdenum[i*(LPC_FILTERORDER+1)]=1.0; |
| 84 | |
| 85 | iLBCdec_inst->last_lag = 20; |
| 86 | |
| 87 | iLBCdec_inst->prevLag = 120; |
| 88 | iLBCdec_inst->per = 0.0; |
| 89 | iLBCdec_inst->consPLICount = 0; |
| 90 | iLBCdec_inst->prevPLI = 0; |
| 91 | iLBCdec_inst->prevLpc[0] = 1.0; |
| 92 | memset(iLBCdec_inst->prevLpc+1,0, |
| 93 | LPC_FILTERORDER*sizeof(float)); |
| 94 | memset(iLBCdec_inst->prevResidual, 0, BLOCKL_MAX*sizeof(float)); |
| 95 | iLBCdec_inst->seed=777; |
| 96 | |
| 97 | |
| 98 | |
| 99 | |
| 100 | |
| 101 | |
| 102 | memset(iLBCdec_inst->hpomem, 0, 4*sizeof(float)); |
| 103 | |
| 104 | iLBCdec_inst->use_enhancer = use_enhancer; |
| 105 | memset(iLBCdec_inst->enh_buf, 0, ENH_BUFL*sizeof(float)); |
| 106 | for (i=0;i<ENH_NBLOCKS_TOT;i++) |
| 107 | iLBCdec_inst->enh_period[i]=(float)40.0; |
| 108 | |
| 109 | iLBCdec_inst->prev_enh_pl = 0; |
| 110 | |
| 111 | return (short)(iLBCdec_inst->blockl); |
| 112 | } |
| 113 | |
| 114 | /*----------------------------------------------------------------* |
| 115 | * frame residual decoder function (subrutine to iLBC_decode) |
| 116 | *---------------------------------------------------------------*/ |
| 117 | |
| 118 | void Decode( |
| 119 | iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) the decoder state |
| 120 | structure */ |
| 121 | float *decresidual, /* (o) decoded residual frame */ |
| 122 | int start, /* (i) location of start |
| 123 | state */ |
| 124 | int idxForMax, /* (i) codebook index for the |
| 125 | maximum value */ |
| 126 | int *idxVec, /* (i) codebook indexes for the |
| 127 | samples in the start |
| 128 | state */ |
| 129 | float *syntdenum, /* (i) the decoded synthesis |
| 130 | filter coefficients */ |
| 131 | int *cb_index, /* (i) the indexes for the |
| 132 | adaptive codebook */ |
| 133 | int *gain_index, /* (i) the indexes for the |
| 134 | corresponding gains */ |
| 135 | int *extra_cb_index, /* (i) the indexes for the |
| 136 | adaptive codebook part |
| 137 | of start state */ |
| 138 | int *extra_gain_index, /* (i) the indexes for the |
| 139 | corresponding gains */ |
| 140 | int state_first /* (i) 1 if non adaptive part |
| 141 | of start state comes |
| 142 | first 0 if that part |
| 143 | comes last */ |
| 144 | ){ |
| 145 | float reverseDecresidual[BLOCKL_MAX], mem[CB_MEML]; |
| 146 | int k, meml_gotten, Nfor, Nback, i; |
| 147 | int diff, start_pos; |
| 148 | int subcount, subframe; |
| 149 | |
| 150 | |
| 151 | |
| 152 | |
| 153 | |
| 154 | |
| 155 | diff = STATE_LEN - iLBCdec_inst->state_short_len; |
| 156 | |
| 157 | if (state_first == 1) { |
| 158 | start_pos = (start-1)*SUBL; |
| 159 | } else { |
| 160 | start_pos = (start-1)*SUBL + diff; |
| 161 | } |
| 162 | |
| 163 | /* decode scalar part of start state */ |
| 164 | |
| 165 | StateConstructW(idxForMax, idxVec, |
| 166 | &syntdenum[(start-1)*(LPC_FILTERORDER+1)], |
| 167 | &decresidual[start_pos], iLBCdec_inst->state_short_len); |
| 168 | |
| 169 | |
| 170 | if (state_first) { /* put adaptive part in the end */ |
| 171 | |
| 172 | /* setup memory */ |
| 173 | |
| 174 | memset(mem, 0, |
| 175 | (CB_MEML-iLBCdec_inst->state_short_len)*sizeof(float)); |
| 176 | memcpy(mem+CB_MEML-iLBCdec_inst->state_short_len, |
| 177 | decresidual+start_pos, |
| 178 | iLBCdec_inst->state_short_len*sizeof(float)); |
| 179 | |
| 180 | /* construct decoded vector */ |
| 181 | |
| 182 | iCBConstruct( |
| 183 | &decresidual[start_pos+iLBCdec_inst->state_short_len], |
| 184 | extra_cb_index, extra_gain_index, mem+CB_MEML-stMemLTbl, |
| 185 | stMemLTbl, diff, CB_NSTAGES); |
| 186 | |
| 187 | } |
| 188 | else {/* put adaptive part in the beginning */ |
| 189 | |
| 190 | /* create reversed vectors for prediction */ |
| 191 | |
| 192 | for (k=0; k<diff; k++) { |
| 193 | reverseDecresidual[k] = |
| 194 | decresidual[(start+1)*SUBL-1- |
| 195 | (k+iLBCdec_inst->state_short_len)]; |
| 196 | } |
| 197 | |
| 198 | /* setup memory */ |
| 199 | |
| 200 | meml_gotten = iLBCdec_inst->state_short_len; |
| 201 | for (k=0; k<meml_gotten; k++){ |
| 202 | mem[CB_MEML-1-k] = decresidual[start_pos + k]; |
| 203 | |
| 204 | |
| 205 | |
| 206 | |
| 207 | |
| 208 | } |
| 209 | memset(mem, 0, (CB_MEML-k)*sizeof(float)); |
| 210 | |
| 211 | /* construct decoded vector */ |
| 212 | |
| 213 | iCBConstruct(reverseDecresidual, extra_cb_index, |
| 214 | extra_gain_index, mem+CB_MEML-stMemLTbl, stMemLTbl, |
| 215 | diff, CB_NSTAGES); |
| 216 | |
| 217 | /* get decoded residual from reversed vector */ |
| 218 | |
| 219 | for (k=0; k<diff; k++) { |
| 220 | decresidual[start_pos-1-k] = reverseDecresidual[k]; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /* counter for predicted sub-frames */ |
| 225 | |
| 226 | subcount=0; |
| 227 | |
| 228 | /* forward prediction of sub-frames */ |
| 229 | |
| 230 | Nfor = iLBCdec_inst->nsub-start-1; |
| 231 | |
| 232 | if ( Nfor > 0 ){ |
| 233 | |
| 234 | /* setup memory */ |
| 235 | |
| 236 | memset(mem, 0, (CB_MEML-STATE_LEN)*sizeof(float)); |
| 237 | memcpy(mem+CB_MEML-STATE_LEN, decresidual+(start-1)*SUBL, |
| 238 | STATE_LEN*sizeof(float)); |
| 239 | |
| 240 | /* loop over sub-frames to encode */ |
| 241 | |
| 242 | for (subframe=0; subframe<Nfor; subframe++) { |
| 243 | |
| 244 | /* construct decoded vector */ |
| 245 | |
| 246 | iCBConstruct(&decresidual[(start+1+subframe)*SUBL], |
| 247 | cb_index+subcount*CB_NSTAGES, |
| 248 | gain_index+subcount*CB_NSTAGES, |
| 249 | mem+CB_MEML-memLfTbl[subcount], |
| 250 | memLfTbl[subcount], SUBL, CB_NSTAGES); |
| 251 | |
| 252 | /* update memory */ |
| 253 | |
| 254 | memcpy(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float)); |
| 255 | memcpy(mem+CB_MEML-SUBL, |
| 256 | |
| 257 | |
| 258 | |
| 259 | |
| 260 | |
| 261 | &decresidual[(start+1+subframe)*SUBL], |
| 262 | SUBL*sizeof(float)); |
| 263 | |
| 264 | subcount++; |
| 265 | |
| 266 | } |
| 267 | |
| 268 | } |
| 269 | |
| 270 | /* backward prediction of sub-frames */ |
| 271 | |
| 272 | Nback = start-1; |
| 273 | |
| 274 | if ( Nback > 0 ) { |
| 275 | |
| 276 | /* setup memory */ |
| 277 | |
| 278 | meml_gotten = SUBL*(iLBCdec_inst->nsub+1-start); |
| 279 | |
| 280 | if ( meml_gotten > CB_MEML ) { |
| 281 | meml_gotten=CB_MEML; |
| 282 | } |
| 283 | for (k=0; k<meml_gotten; k++) { |
| 284 | mem[CB_MEML-1-k] = decresidual[(start-1)*SUBL + k]; |
| 285 | } |
| 286 | memset(mem, 0, (CB_MEML-k)*sizeof(float)); |
| 287 | |
| 288 | /* loop over subframes to decode */ |
| 289 | |
| 290 | for (subframe=0; subframe<Nback; subframe++) { |
| 291 | |
| 292 | /* construct decoded vector */ |
| 293 | |
| 294 | iCBConstruct(&reverseDecresidual[subframe*SUBL], |
| 295 | cb_index+subcount*CB_NSTAGES, |
| 296 | gain_index+subcount*CB_NSTAGES, |
| 297 | mem+CB_MEML-memLfTbl[subcount], memLfTbl[subcount], |
| 298 | SUBL, CB_NSTAGES); |
| 299 | |
| 300 | /* update memory */ |
| 301 | |
| 302 | memcpy(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float)); |
| 303 | memcpy(mem+CB_MEML-SUBL, |
| 304 | &reverseDecresidual[subframe*SUBL], |
| 305 | SUBL*sizeof(float)); |
| 306 | |
| 307 | subcount++; |
| 308 | } |
| 309 | |
| 310 | |
| 311 | |
| 312 | |
| 313 | |
| 314 | /* get decoded residual from reversed vector */ |
| 315 | |
| 316 | for (i=0; i<SUBL*Nback; i++) |
| 317 | decresidual[SUBL*Nback - i - 1] = |
| 318 | reverseDecresidual[i]; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | /*----------------------------------------------------------------* |
| 323 | * main decoder function |
| 324 | *---------------------------------------------------------------*/ |
| 325 | |
| 326 | void iLBC_decode( |
| 327 | float *decblock, /* (o) decoded signal block */ |
| 328 | unsigned char *bytes, /* (i) encoded signal bits */ |
| 329 | iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) the decoder state |
| 330 | structure */ |
| 331 | int mode /* (i) 0: bad packet, PLC, |
| 332 | 1: normal */ |
| 333 | ){ |
| 334 | float data[BLOCKL_MAX]; |
| 335 | float lsfdeq[LPC_FILTERORDER*LPC_N_MAX]; |
| 336 | float PLCresidual[BLOCKL_MAX], PLClpc[LPC_FILTERORDER + 1]; |
| 337 | float zeros[BLOCKL_MAX], one[LPC_FILTERORDER + 1]; |
| 338 | int k, i, start, idxForMax, pos, lastpart, ulp; |
| 339 | int lag, ilag; |
| 340 | float cc, maxcc; |
| 341 | int idxVec[STATE_LEN]; |
| 342 | int check; |
| 343 | int gain_index[NASUB_MAX*CB_NSTAGES], |
| 344 | extra_gain_index[CB_NSTAGES]; |
| 345 | int cb_index[CB_NSTAGES*NASUB_MAX], extra_cb_index[CB_NSTAGES]; |
| 346 | int lsf_i[LSF_NSPLIT*LPC_N_MAX]; |
| 347 | int state_first; |
| 348 | int last_bit; |
| 349 | unsigned char *pbytes; |
| 350 | float weightdenum[(LPC_FILTERORDER + 1)*NSUB_MAX]; |
| 351 | int order_plus_one; |
| 352 | float syntdenum[NSUB_MAX*(LPC_FILTERORDER+1)]; |
| 353 | float decresidual[BLOCKL_MAX]; |
| 354 | |
| 355 | if (mode>0) { /* the data are good */ |
| 356 | |
| 357 | /* decode data */ |
| 358 | |
| 359 | pbytes=bytes; |
| 360 | pos=0; |
| 361 | |
| 362 | |
| 363 | |
| 364 | |
| 365 | |
| 366 | |
| 367 | /* Set everything to zero before decoding */ |
| 368 | |
| 369 | for (k=0; k<LSF_NSPLIT*LPC_N_MAX; k++) { |
| 370 | lsf_i[k]=0; |
| 371 | } |
| 372 | start=0; |
| 373 | state_first=0; |
| 374 | idxForMax=0; |
| 375 | for (k=0; k<iLBCdec_inst->state_short_len; k++) { |
| 376 | idxVec[k]=0; |
| 377 | } |
| 378 | for (k=0; k<CB_NSTAGES; k++) { |
| 379 | extra_cb_index[k]=0; |
| 380 | } |
| 381 | for (k=0; k<CB_NSTAGES; k++) { |
| 382 | extra_gain_index[k]=0; |
| 383 | } |
| 384 | for (i=0; i<iLBCdec_inst->nasub; i++) { |
| 385 | for (k=0; k<CB_NSTAGES; k++) { |
| 386 | cb_index[i*CB_NSTAGES+k]=0; |
| 387 | } |
| 388 | } |
| 389 | for (i=0; i<iLBCdec_inst->nasub; i++) { |
| 390 | for (k=0; k<CB_NSTAGES; k++) { |
| 391 | gain_index[i*CB_NSTAGES+k]=0; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* loop over ULP classes */ |
| 396 | |
| 397 | for (ulp=0; ulp<3; ulp++) { |
| 398 | |
| 399 | /* LSF */ |
| 400 | for (k=0; k<LSF_NSPLIT*iLBCdec_inst->lpc_n; k++){ |
| 401 | unpack( &pbytes, &lastpart, |
| 402 | iLBCdec_inst->ULP_inst->lsf_bits[k][ulp], &pos); |
| 403 | packcombine(&lsf_i[k], lastpart, |
| 404 | iLBCdec_inst->ULP_inst->lsf_bits[k][ulp]); |
| 405 | } |
| 406 | |
| 407 | /* Start block info */ |
| 408 | |
| 409 | unpack( &pbytes, &lastpart, |
| 410 | iLBCdec_inst->ULP_inst->start_bits[ulp], &pos); |
| 411 | packcombine(&start, lastpart, |
| 412 | iLBCdec_inst->ULP_inst->start_bits[ulp]); |
| 413 | |
| 414 | unpack( &pbytes, &lastpart, |
| 415 | |
| 416 | |
| 417 | |
| 418 | |
| 419 | |
| 420 | iLBCdec_inst->ULP_inst->startfirst_bits[ulp], &pos); |
| 421 | packcombine(&state_first, lastpart, |
| 422 | iLBCdec_inst->ULP_inst->startfirst_bits[ulp]); |
| 423 | |
| 424 | unpack( &pbytes, &lastpart, |
| 425 | iLBCdec_inst->ULP_inst->scale_bits[ulp], &pos); |
| 426 | packcombine(&idxForMax, lastpart, |
| 427 | iLBCdec_inst->ULP_inst->scale_bits[ulp]); |
| 428 | |
| 429 | for (k=0; k<iLBCdec_inst->state_short_len; k++) { |
| 430 | unpack( &pbytes, &lastpart, |
| 431 | iLBCdec_inst->ULP_inst->state_bits[ulp], &pos); |
| 432 | packcombine(idxVec+k, lastpart, |
| 433 | iLBCdec_inst->ULP_inst->state_bits[ulp]); |
| 434 | } |
| 435 | |
| 436 | /* 23/22 (20ms/30ms) sample block */ |
| 437 | |
| 438 | for (k=0; k<CB_NSTAGES; k++) { |
| 439 | unpack( &pbytes, &lastpart, |
| 440 | iLBCdec_inst->ULP_inst->extra_cb_index[k][ulp], |
| 441 | &pos); |
| 442 | packcombine(extra_cb_index+k, lastpart, |
| 443 | iLBCdec_inst->ULP_inst->extra_cb_index[k][ulp]); |
| 444 | } |
| 445 | for (k=0; k<CB_NSTAGES; k++) { |
| 446 | unpack( &pbytes, &lastpart, |
| 447 | iLBCdec_inst->ULP_inst->extra_cb_gain[k][ulp], |
| 448 | &pos); |
| 449 | packcombine(extra_gain_index+k, lastpart, |
| 450 | iLBCdec_inst->ULP_inst->extra_cb_gain[k][ulp]); |
| 451 | } |
| 452 | |
| 453 | /* The two/four (20ms/30ms) 40 sample sub-blocks */ |
| 454 | |
| 455 | for (i=0; i<iLBCdec_inst->nasub; i++) { |
| 456 | for (k=0; k<CB_NSTAGES; k++) { |
| 457 | unpack( &pbytes, &lastpart, |
| 458 | iLBCdec_inst->ULP_inst->cb_index[i][k][ulp], |
| 459 | &pos); |
| 460 | packcombine(cb_index+i*CB_NSTAGES+k, lastpart, |
| 461 | iLBCdec_inst->ULP_inst->cb_index[i][k][ulp]); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | for (i=0; i<iLBCdec_inst->nasub; i++) { |
| 466 | for (k=0; k<CB_NSTAGES; k++) { |
| 467 | unpack( &pbytes, &lastpart, |
| 468 | |
| 469 | |
| 470 | |
| 471 | |
| 472 | |
| 473 | iLBCdec_inst->ULP_inst->cb_gain[i][k][ulp], |
| 474 | &pos); |
| 475 | packcombine(gain_index+i*CB_NSTAGES+k, lastpart, |
| 476 | iLBCdec_inst->ULP_inst->cb_gain[i][k][ulp]); |
| 477 | } |
| 478 | } |
| 479 | } |
| 480 | /* Extract last bit. If it is 1 this indicates an |
| 481 | empty/lost frame */ |
| 482 | unpack( &pbytes, &last_bit, 1, &pos); |
| 483 | |
| 484 | /* Check for bit errors or empty/lost frames */ |
| 485 | if (start<1) |
| 486 | mode = 0; |
| 487 | if (iLBCdec_inst->mode==20 && start>3) |
| 488 | mode = 0; |
| 489 | if (iLBCdec_inst->mode==30 && start>5) |
| 490 | mode = 0; |
| 491 | if (last_bit==1) |
| 492 | mode = 0; |
| 493 | |
| 494 | if (mode==1) { /* No bit errors was detected, |
| 495 | continue decoding */ |
| 496 | |
| 497 | /* adjust index */ |
| 498 | index_conv_dec(cb_index); |
| 499 | |
| 500 | /* decode the lsf */ |
| 501 | |
| 502 | SimplelsfDEQ(lsfdeq, lsf_i, iLBCdec_inst->lpc_n); |
| 503 | check=LSF_check(lsfdeq, LPC_FILTERORDER, |
| 504 | iLBCdec_inst->lpc_n); |
| 505 | DecoderInterpolateLSF(syntdenum, weightdenum, |
| 506 | lsfdeq, LPC_FILTERORDER, iLBCdec_inst); |
| 507 | |
| 508 | Decode(iLBCdec_inst, decresidual, start, idxForMax, |
| 509 | idxVec, syntdenum, cb_index, gain_index, |
| 510 | extra_cb_index, extra_gain_index, |
| 511 | state_first); |
| 512 | |
| 513 | /* preparing the plc for a future loss! */ |
| 514 | |
| 515 | doThePLC(PLCresidual, PLClpc, 0, decresidual, |
| 516 | syntdenum + |
| 517 | (LPC_FILTERORDER + 1)*(iLBCdec_inst->nsub - 1), |
| 518 | (*iLBCdec_inst).last_lag, iLBCdec_inst); |
| 519 | |
| 520 | |
| 521 | |
| 522 | |
| 523 | |
| 524 | |
| 525 | |
| 526 | memcpy(decresidual, PLCresidual, |
| 527 | iLBCdec_inst->blockl*sizeof(float)); |
| 528 | } |
| 529 | |
| 530 | } |
| 531 | |
| 532 | if (mode == 0) { |
| 533 | /* the data is bad (either a PLC call |
| 534 | * was made or a severe bit error was detected) |
| 535 | */ |
| 536 | |
| 537 | /* packet loss conceal */ |
| 538 | |
| 539 | memset(zeros, 0, BLOCKL_MAX*sizeof(float)); |
| 540 | |
| 541 | one[0] = 1; |
| 542 | memset(one+1, 0, LPC_FILTERORDER*sizeof(float)); |
| 543 | |
| 544 | start=0; |
| 545 | |
| 546 | doThePLC(PLCresidual, PLClpc, 1, zeros, one, |
| 547 | (*iLBCdec_inst).last_lag, iLBCdec_inst); |
| 548 | memcpy(decresidual, PLCresidual, |
| 549 | iLBCdec_inst->blockl*sizeof(float)); |
| 550 | |
| 551 | order_plus_one = LPC_FILTERORDER + 1; |
| 552 | for (i = 0; i < iLBCdec_inst->nsub; i++) { |
| 553 | memcpy(syntdenum+(i*order_plus_one), PLClpc, |
| 554 | order_plus_one*sizeof(float)); |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | if (iLBCdec_inst->use_enhancer == 1) { |
| 559 | |
| 560 | /* post filtering */ |
| 561 | |
| 562 | iLBCdec_inst->last_lag = |
| 563 | enhancerInterface(data, decresidual, iLBCdec_inst); |
| 564 | |
| 565 | /* synthesis filtering */ |
| 566 | |
| 567 | if (iLBCdec_inst->mode==20) { |
| 568 | /* Enhancer has 40 samples delay */ |
| 569 | i=0; |
| 570 | syntFilter(data + i*SUBL, |
| 571 | iLBCdec_inst->old_syntdenum + |
| 572 | (i+iLBCdec_inst->nsub-1)*(LPC_FILTERORDER+1), |
| 573 | SUBL, iLBCdec_inst->syntMem); |
| 574 | |
| 575 | |
| 576 | |
| 577 | |
| 578 | |
| 579 | for (i=1; i < iLBCdec_inst->nsub; i++) { |
| 580 | syntFilter(data + i*SUBL, |
| 581 | syntdenum + (i-1)*(LPC_FILTERORDER+1), |
| 582 | SUBL, iLBCdec_inst->syntMem); |
| 583 | } |
| 584 | } else if (iLBCdec_inst->mode==30) { |
| 585 | /* Enhancer has 80 samples delay */ |
| 586 | for (i=0; i < 2; i++) { |
| 587 | syntFilter(data + i*SUBL, |
| 588 | iLBCdec_inst->old_syntdenum + |
| 589 | (i+iLBCdec_inst->nsub-2)*(LPC_FILTERORDER+1), |
| 590 | SUBL, iLBCdec_inst->syntMem); |
| 591 | } |
| 592 | for (i=2; i < iLBCdec_inst->nsub; i++) { |
| 593 | syntFilter(data + i*SUBL, |
| 594 | syntdenum + (i-2)*(LPC_FILTERORDER+1), SUBL, |
| 595 | iLBCdec_inst->syntMem); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | } else { |
| 600 | |
| 601 | /* Find last lag */ |
| 602 | lag = 20; |
| 603 | maxcc = xCorrCoef(&decresidual[BLOCKL_MAX-ENH_BLOCKL], |
| 604 | &decresidual[BLOCKL_MAX-ENH_BLOCKL-lag], ENH_BLOCKL); |
| 605 | |
| 606 | for (ilag=21; ilag<120; ilag++) { |
| 607 | cc = xCorrCoef(&decresidual[BLOCKL_MAX-ENH_BLOCKL], |
| 608 | &decresidual[BLOCKL_MAX-ENH_BLOCKL-ilag], |
| 609 | ENH_BLOCKL); |
| 610 | |
| 611 | if (cc > maxcc) { |
| 612 | maxcc = cc; |
| 613 | lag = ilag; |
| 614 | } |
| 615 | } |
| 616 | iLBCdec_inst->last_lag = lag; |
| 617 | |
| 618 | /* copy data and run synthesis filter */ |
| 619 | |
| 620 | memcpy(data, decresidual, |
| 621 | iLBCdec_inst->blockl*sizeof(float)); |
| 622 | for (i=0; i < iLBCdec_inst->nsub; i++) { |
| 623 | syntFilter(data + i*SUBL, |
| 624 | syntdenum + i*(LPC_FILTERORDER+1), SUBL, |
| 625 | iLBCdec_inst->syntMem); |
| 626 | } |
| 627 | |
| 628 | |
| 629 | |
| 630 | |
| 631 | |
| 632 | } |
| 633 | |
| 634 | /* high pass filtering on output if desired, otherwise |
| 635 | copy to out */ |
| 636 | |
| 637 | hpOutput(data, iLBCdec_inst->blockl, |
| 638 | decblock,iLBCdec_inst->hpomem); |
| 639 | |
| 640 | /* memcpy(decblock,data,iLBCdec_inst->blockl*sizeof(float));*/ |
| 641 | |
| 642 | memcpy(iLBCdec_inst->old_syntdenum, syntdenum, |
| 643 | |
| 644 | iLBCdec_inst->nsub*(LPC_FILTERORDER+1)*sizeof(float)); |
| 645 | |
| 646 | iLBCdec_inst->prev_enh_pl=0; |
| 647 | |
| 648 | if (mode==0) { /* PLC was used */ |
| 649 | iLBCdec_inst->prev_enh_pl=1; |
| 650 | } |
| 651 | } |
| 652 | |