| /* |
| * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| /****************************************************************** |
| |
| iLBC Speech Coder ANSI-C Source Code |
| |
| WebRtcIlbcfix_InitDecode.c |
| |
| ******************************************************************/ |
| |
| #include "defines.h" |
| #include "constants.h" |
| |
| /*----------------------------------------------------------------* |
| * Initiation of decoder instance. |
| *---------------------------------------------------------------*/ |
| |
| WebRtc_Word16 WebRtcIlbcfix_InitDecode( /* (o) Number of decoded samples */ |
| iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) Decoder instance */ |
| WebRtc_Word16 mode, /* (i) frame size mode */ |
| int use_enhancer) { /* (i) 1: use enhancer, 0: no enhancer */ |
| int i; |
| |
| WebRtcSpl_Init(); |
| |
| iLBCdec_inst->mode = mode; |
| |
| /* Set all the variables that are dependent on the frame size mode */ |
| if (mode==30) { |
| iLBCdec_inst->blockl = BLOCKL_30MS; |
| iLBCdec_inst->nsub = NSUB_30MS; |
| iLBCdec_inst->nasub = NASUB_30MS; |
| iLBCdec_inst->lpc_n = LPC_N_30MS; |
| iLBCdec_inst->no_of_bytes = NO_OF_BYTES_30MS; |
| iLBCdec_inst->no_of_words = NO_OF_WORDS_30MS; |
| iLBCdec_inst->state_short_len=STATE_SHORT_LEN_30MS; |
| } |
| else if (mode==20) { |
| iLBCdec_inst->blockl = BLOCKL_20MS; |
| iLBCdec_inst->nsub = NSUB_20MS; |
| iLBCdec_inst->nasub = NASUB_20MS; |
| iLBCdec_inst->lpc_n = LPC_N_20MS; |
| iLBCdec_inst->no_of_bytes = NO_OF_BYTES_20MS; |
| iLBCdec_inst->no_of_words = NO_OF_WORDS_20MS; |
| iLBCdec_inst->state_short_len=STATE_SHORT_LEN_20MS; |
| } |
| else { |
| return(-1); |
| } |
| |
| /* Reset all the previous LSF to mean LSF */ |
| WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->lsfdeqold, WebRtcIlbcfix_kLsfMean, LPC_FILTERORDER); |
| |
| /* Clear the synthesis filter memory */ |
| WebRtcSpl_MemSetW16(iLBCdec_inst->syntMem, 0, LPC_FILTERORDER); |
| |
| /* Set the old synthesis filter to {1.0 0.0 ... 0.0} */ |
| WebRtcSpl_MemSetW16(iLBCdec_inst->old_syntdenum, 0, ((LPC_FILTERORDER + 1)*NSUB_MAX)); |
| for (i=0; i<NSUB_MAX; i++) { |
| iLBCdec_inst->old_syntdenum[i*(LPC_FILTERORDER+1)] = 4096; |
| } |
| |
| /* Clear the variables that are used for the PLC */ |
| iLBCdec_inst->last_lag = 20; |
| iLBCdec_inst->consPLICount = 0; |
| iLBCdec_inst->prevPLI = 0; |
| iLBCdec_inst->perSquare = 0; |
| iLBCdec_inst->prevLag = 120; |
| iLBCdec_inst->prevLpc[0] = 4096; |
| WebRtcSpl_MemSetW16(iLBCdec_inst->prevLpc+1, 0, LPC_FILTERORDER); |
| WebRtcSpl_MemSetW16(iLBCdec_inst->prevResidual, 0, BLOCKL_MAX); |
| |
| /* Initialize the seed for the random number generator */ |
| iLBCdec_inst->seed = 777; |
| |
| /* Set the filter state of the HP filter to 0 */ |
| WebRtcSpl_MemSetW16(iLBCdec_inst->hpimemx, 0, 2); |
| WebRtcSpl_MemSetW16(iLBCdec_inst->hpimemy, 0, 4); |
| |
| /* Set the variables that are used in the ehnahcer */ |
| iLBCdec_inst->use_enhancer = use_enhancer; |
| WebRtcSpl_MemSetW16(iLBCdec_inst->enh_buf, 0, (ENH_BUFL+ENH_BUFL_FILTEROVERHEAD)); |
| for (i=0;i<ENH_NBLOCKS_TOT;i++) { |
| iLBCdec_inst->enh_period[i]=160; /* Q(-4) */ |
| } |
| |
| iLBCdec_inst->prev_enh_pl = 0; |
| |
| return (iLBCdec_inst->blockl); |
| } |