mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-27 18:27:43 +00:00
97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/*
|
|
* 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.
|
|
*---------------------------------------------------------------*/
|
|
|
|
int16_t WebRtcIlbcfix_InitDecode( /* (o) Number of decoded samples */
|
|
iLBC_Dec_Inst_t *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 (iLBCdec_inst->blockl);
|
|
}
|