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/*
* 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 "modules/audio_coding/codecs/ilbc/init_decode.h"
#include "modules/audio_coding/codecs/ilbc/constants.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
/*----------------------------------------------------------------*
* Initiation of decoder instance.
*---------------------------------------------------------------*/
int WebRtcIlbcfix_InitDecode( /* (o) Number of decoded samples */
IlbcDecoder *iLBCdec_inst, /* (i/o) Decoder instance */
int16_t mode, /* (i) frame size mode */
int use_enhancer) { /* (i) 1: use enhancer, 0: no enhancer */
int i;
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 (int)(iLBCdec_inst->blockl);
}
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