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97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_InitDecode.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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/*----------------------------------------------------------------*
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* Initiation of decoder instance.
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*---------------------------------------------------------------*/
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int16_t WebRtcIlbcfix_InitDecode( /* (o) Number of decoded samples */
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iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) Decoder instance */
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int16_t mode, /* (i) frame size mode */
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int use_enhancer) { /* (i) 1: use enhancer, 0: no enhancer */
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int i;
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iLBCdec_inst->mode = mode;
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/* Set all the variables that are dependent on the frame size mode */
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if (mode==30) {
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iLBCdec_inst->blockl = BLOCKL_30MS;
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iLBCdec_inst->nsub = NSUB_30MS;
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iLBCdec_inst->nasub = NASUB_30MS;
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iLBCdec_inst->lpc_n = LPC_N_30MS;
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iLBCdec_inst->no_of_bytes = NO_OF_BYTES_30MS;
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iLBCdec_inst->no_of_words = NO_OF_WORDS_30MS;
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iLBCdec_inst->state_short_len=STATE_SHORT_LEN_30MS;
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}
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else if (mode==20) {
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iLBCdec_inst->blockl = BLOCKL_20MS;
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iLBCdec_inst->nsub = NSUB_20MS;
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iLBCdec_inst->nasub = NASUB_20MS;
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iLBCdec_inst->lpc_n = LPC_N_20MS;
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iLBCdec_inst->no_of_bytes = NO_OF_BYTES_20MS;
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iLBCdec_inst->no_of_words = NO_OF_WORDS_20MS;
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iLBCdec_inst->state_short_len=STATE_SHORT_LEN_20MS;
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}
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else {
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return(-1);
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}
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/* Reset all the previous LSF to mean LSF */
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WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->lsfdeqold, WebRtcIlbcfix_kLsfMean, LPC_FILTERORDER);
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/* Clear the synthesis filter memory */
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WebRtcSpl_MemSetW16(iLBCdec_inst->syntMem, 0, LPC_FILTERORDER);
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/* Set the old synthesis filter to {1.0 0.0 ... 0.0} */
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WebRtcSpl_MemSetW16(iLBCdec_inst->old_syntdenum, 0, ((LPC_FILTERORDER + 1)*NSUB_MAX));
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for (i=0; i<NSUB_MAX; i++) {
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iLBCdec_inst->old_syntdenum[i*(LPC_FILTERORDER+1)] = 4096;
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}
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/* Clear the variables that are used for the PLC */
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iLBCdec_inst->last_lag = 20;
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iLBCdec_inst->consPLICount = 0;
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iLBCdec_inst->prevPLI = 0;
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iLBCdec_inst->perSquare = 0;
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iLBCdec_inst->prevLag = 120;
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iLBCdec_inst->prevLpc[0] = 4096;
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WebRtcSpl_MemSetW16(iLBCdec_inst->prevLpc+1, 0, LPC_FILTERORDER);
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WebRtcSpl_MemSetW16(iLBCdec_inst->prevResidual, 0, BLOCKL_MAX);
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/* Initialize the seed for the random number generator */
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iLBCdec_inst->seed = 777;
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/* Set the filter state of the HP filter to 0 */
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WebRtcSpl_MemSetW16(iLBCdec_inst->hpimemx, 0, 2);
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WebRtcSpl_MemSetW16(iLBCdec_inst->hpimemy, 0, 4);
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/* Set the variables that are used in the ehnahcer */
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iLBCdec_inst->use_enhancer = use_enhancer;
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WebRtcSpl_MemSetW16(iLBCdec_inst->enh_buf, 0, (ENH_BUFL+ENH_BUFL_FILTEROVERHEAD));
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for (i=0;i<ENH_NBLOCKS_TOT;i++) {
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iLBCdec_inst->enh_period[i]=160; /* Q(-4) */
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}
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iLBCdec_inst->prev_enh_pl = 0;
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return (iLBCdec_inst->blockl);
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}
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