mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-24 16:57:50 +00:00
244 lines
8.1 KiB
C
244 lines
8.1 KiB
C
/*
|
|
* Copyright (c) 2012 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_Decode.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "defines.h"
|
|
#include "simple_lsf_dequant.h"
|
|
#include "decoder_interpolate_lsf.h"
|
|
#include "index_conv_dec.h"
|
|
#include "do_plc.h"
|
|
#include "constants.h"
|
|
#include "enhancer_interface.h"
|
|
#include "xcorr_coef.h"
|
|
#include "lsf_check.h"
|
|
#include "decode_residual.h"
|
|
#include "unpack_bits.h"
|
|
#include "hp_output.h"
|
|
#ifndef WEBRTC_ARCH_BIG_ENDIAN
|
|
#include "swap_bytes.h"
|
|
#endif
|
|
|
|
/*----------------------------------------------------------------*
|
|
* main decoder function
|
|
*---------------------------------------------------------------*/
|
|
|
|
void WebRtcIlbcfix_DecodeImpl(
|
|
int16_t *decblock, /* (o) decoded signal block */
|
|
const uint16_t *bytes, /* (i) encoded signal bits */
|
|
iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) the decoder state
|
|
structure */
|
|
int16_t mode /* (i) 0: bad packet, PLC,
|
|
1: normal */
|
|
) {
|
|
int i;
|
|
int16_t order_plus_one;
|
|
|
|
int16_t last_bit;
|
|
int16_t *data;
|
|
/* Stack based */
|
|
int16_t decresidual[BLOCKL_MAX];
|
|
int16_t PLCresidual[BLOCKL_MAX + LPC_FILTERORDER];
|
|
int16_t syntdenum[NSUB_MAX*(LPC_FILTERORDER+1)];
|
|
int16_t PLClpc[LPC_FILTERORDER + 1];
|
|
#ifndef WEBRTC_ARCH_BIG_ENDIAN
|
|
uint16_t swapped[NO_OF_WORDS_30MS];
|
|
#endif
|
|
iLBC_bits *iLBCbits_inst = (iLBC_bits*)PLCresidual;
|
|
|
|
/* Reuse some buffers that are non overlapping in order to save stack memory */
|
|
data = &PLCresidual[LPC_FILTERORDER];
|
|
|
|
if (mode) { /* the data are good */
|
|
|
|
/* decode data */
|
|
|
|
/* Unpacketize bits into parameters */
|
|
|
|
#ifndef WEBRTC_ARCH_BIG_ENDIAN
|
|
WebRtcIlbcfix_SwapBytes(bytes, iLBCdec_inst->no_of_words, swapped);
|
|
last_bit = WebRtcIlbcfix_UnpackBits(swapped, iLBCbits_inst, iLBCdec_inst->mode);
|
|
#else
|
|
last_bit = WebRtcIlbcfix_UnpackBits(bytes, iLBCbits_inst, iLBCdec_inst->mode);
|
|
#endif
|
|
|
|
/* Check for bit errors */
|
|
if (iLBCbits_inst->startIdx<1)
|
|
mode = 0;
|
|
if ((iLBCdec_inst->mode==20) && (iLBCbits_inst->startIdx>3))
|
|
mode = 0;
|
|
if ((iLBCdec_inst->mode==30) && (iLBCbits_inst->startIdx>5))
|
|
mode = 0;
|
|
if (last_bit==1)
|
|
mode = 0;
|
|
|
|
if (mode) { /* No bit errors was detected, continue decoding */
|
|
/* Stack based */
|
|
int16_t lsfdeq[LPC_FILTERORDER*LPC_N_MAX];
|
|
int16_t weightdenum[(LPC_FILTERORDER + 1)*NSUB_MAX];
|
|
|
|
/* adjust index */
|
|
WebRtcIlbcfix_IndexConvDec(iLBCbits_inst->cb_index);
|
|
|
|
/* decode the lsf */
|
|
WebRtcIlbcfix_SimpleLsfDeQ(lsfdeq, (int16_t*)(iLBCbits_inst->lsf), iLBCdec_inst->lpc_n);
|
|
WebRtcIlbcfix_LsfCheck(lsfdeq, LPC_FILTERORDER, iLBCdec_inst->lpc_n);
|
|
WebRtcIlbcfix_DecoderInterpolateLsp(syntdenum, weightdenum,
|
|
lsfdeq, LPC_FILTERORDER, iLBCdec_inst);
|
|
|
|
/* Decode the residual using the cb and gain indexes */
|
|
WebRtcIlbcfix_DecodeResidual(iLBCdec_inst, iLBCbits_inst, decresidual, syntdenum);
|
|
|
|
/* preparing the plc for a future loss! */
|
|
WebRtcIlbcfix_DoThePlc( PLCresidual, PLClpc, 0,
|
|
decresidual, syntdenum + (LPC_FILTERORDER + 1)*(iLBCdec_inst->nsub - 1),
|
|
(int16_t)(iLBCdec_inst->last_lag), iLBCdec_inst);
|
|
|
|
/* Use the output from doThePLC */
|
|
WEBRTC_SPL_MEMCPY_W16(decresidual, PLCresidual, iLBCdec_inst->blockl);
|
|
}
|
|
|
|
}
|
|
|
|
if (mode == 0) {
|
|
/* the data is bad (either a PLC call
|
|
* was made or a bit error was detected)
|
|
*/
|
|
|
|
/* packet loss conceal */
|
|
|
|
WebRtcIlbcfix_DoThePlc( PLCresidual, PLClpc, 1,
|
|
decresidual, syntdenum, (int16_t)(iLBCdec_inst->last_lag), iLBCdec_inst);
|
|
|
|
WEBRTC_SPL_MEMCPY_W16(decresidual, PLCresidual, iLBCdec_inst->blockl);
|
|
|
|
order_plus_one = LPC_FILTERORDER + 1;
|
|
|
|
for (i = 0; i < iLBCdec_inst->nsub; i++) {
|
|
WEBRTC_SPL_MEMCPY_W16(syntdenum+(i*order_plus_one),
|
|
PLClpc, order_plus_one);
|
|
}
|
|
}
|
|
|
|
if ((*iLBCdec_inst).use_enhancer == 1) { /* Enhancer activated */
|
|
|
|
/* Update the filter and filter coefficients if there was a packet loss */
|
|
if (iLBCdec_inst->prev_enh_pl==2) {
|
|
for (i=0;i<iLBCdec_inst->nsub;i++) {
|
|
WEBRTC_SPL_MEMCPY_W16(&(iLBCdec_inst->old_syntdenum[i*(LPC_FILTERORDER+1)]),
|
|
syntdenum, (LPC_FILTERORDER+1));
|
|
}
|
|
}
|
|
|
|
/* post filtering */
|
|
(*iLBCdec_inst).last_lag =
|
|
WebRtcIlbcfix_EnhancerInterface(data, decresidual, iLBCdec_inst);
|
|
|
|
/* synthesis filtering */
|
|
|
|
/* Set up the filter state */
|
|
WEBRTC_SPL_MEMCPY_W16(&data[-LPC_FILTERORDER], iLBCdec_inst->syntMem, LPC_FILTERORDER);
|
|
|
|
if (iLBCdec_inst->mode==20) {
|
|
/* Enhancer has 40 samples delay */
|
|
i=0;
|
|
WebRtcSpl_FilterARFastQ12(
|
|
data, data,
|
|
iLBCdec_inst->old_syntdenum + (i+iLBCdec_inst->nsub-1)*(LPC_FILTERORDER+1),
|
|
LPC_FILTERORDER+1, SUBL);
|
|
|
|
for (i=1; i < iLBCdec_inst->nsub; i++) {
|
|
WebRtcSpl_FilterARFastQ12(
|
|
data+i*SUBL, data+i*SUBL,
|
|
syntdenum+(i-1)*(LPC_FILTERORDER+1),
|
|
LPC_FILTERORDER+1, SUBL);
|
|
}
|
|
|
|
} else if (iLBCdec_inst->mode==30) {
|
|
/* Enhancer has 80 samples delay */
|
|
for (i=0; i < 2; i++) {
|
|
WebRtcSpl_FilterARFastQ12(
|
|
data+i*SUBL, data+i*SUBL,
|
|
iLBCdec_inst->old_syntdenum + (i+4)*(LPC_FILTERORDER+1),
|
|
LPC_FILTERORDER+1, SUBL);
|
|
}
|
|
for (i=2; i < iLBCdec_inst->nsub; i++) {
|
|
WebRtcSpl_FilterARFastQ12(
|
|
data+i*SUBL, data+i*SUBL,
|
|
syntdenum+(i-2)*(LPC_FILTERORDER+1),
|
|
LPC_FILTERORDER+1, SUBL);
|
|
}
|
|
}
|
|
|
|
/* Save the filter state */
|
|
WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->syntMem, &data[iLBCdec_inst->blockl-LPC_FILTERORDER], LPC_FILTERORDER);
|
|
|
|
} else { /* Enhancer not activated */
|
|
int16_t lag;
|
|
|
|
/* Find last lag (since the enhancer is not called to give this info) */
|
|
lag = 20;
|
|
if (iLBCdec_inst->mode==20) {
|
|
lag = (int16_t)WebRtcIlbcfix_XcorrCoef(
|
|
&decresidual[iLBCdec_inst->blockl-60],
|
|
&decresidual[iLBCdec_inst->blockl-60-lag],
|
|
60,
|
|
80, lag, -1);
|
|
} else {
|
|
lag = (int16_t)WebRtcIlbcfix_XcorrCoef(
|
|
&decresidual[iLBCdec_inst->blockl-ENH_BLOCKL],
|
|
&decresidual[iLBCdec_inst->blockl-ENH_BLOCKL-lag],
|
|
ENH_BLOCKL,
|
|
100, lag, -1);
|
|
}
|
|
|
|
/* Store lag (it is needed if next packet is lost) */
|
|
(*iLBCdec_inst).last_lag = (int)lag;
|
|
|
|
/* copy data and run synthesis filter */
|
|
WEBRTC_SPL_MEMCPY_W16(data, decresidual, iLBCdec_inst->blockl);
|
|
|
|
/* Set up the filter state */
|
|
WEBRTC_SPL_MEMCPY_W16(&data[-LPC_FILTERORDER], iLBCdec_inst->syntMem, LPC_FILTERORDER);
|
|
|
|
for (i=0; i < iLBCdec_inst->nsub; i++) {
|
|
WebRtcSpl_FilterARFastQ12(
|
|
data+i*SUBL, data+i*SUBL,
|
|
syntdenum + i*(LPC_FILTERORDER+1),
|
|
LPC_FILTERORDER+1, SUBL);
|
|
}
|
|
|
|
/* Save the filter state */
|
|
WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->syntMem, &data[iLBCdec_inst->blockl-LPC_FILTERORDER], LPC_FILTERORDER);
|
|
}
|
|
|
|
WEBRTC_SPL_MEMCPY_W16(decblock,data,iLBCdec_inst->blockl);
|
|
|
|
/* High pass filter the signal (with upscaling a factor 2 and saturation) */
|
|
WebRtcIlbcfix_HpOutput(decblock, (int16_t*)WebRtcIlbcfix_kHpOutCoefs,
|
|
iLBCdec_inst->hpimemy, iLBCdec_inst->hpimemx,
|
|
iLBCdec_inst->blockl);
|
|
|
|
WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->old_syntdenum,
|
|
syntdenum, iLBCdec_inst->nsub*(LPC_FILTERORDER+1));
|
|
|
|
iLBCdec_inst->prev_enh_pl=0;
|
|
|
|
if (mode==0) { /* PLC was used */
|
|
iLBCdec_inst->prev_enh_pl=1;
|
|
}
|
|
}
|