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webrtc/modules/audio_coding/codecs/ilbc/decode.c
Mirko Bonadei 06c2aa9f7b Using fully qualified #include paths in ilbc code. 
WebRTC internal code should always use include paths that start
from the root of the project and that clearly identify the header file.

This allows 'gn check' to actually keep dependencies under control
because 'gn check' cannot enforce anything if the include path
is not fully qualified (starting from the root of the project).

Bug: webrtc:8815
Change-Id: I36f01784fa5f5b77eefc02db479b1f7f6ee1a8c3
Reviewed-on: https://webrtc-review.googlesource.com/46263
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21871}
2018-02-02 13:28:13 +00:00

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/*
* 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 "modules/audio_coding/codecs/ilbc/defines.h"
#include "modules/audio_coding/codecs/ilbc/simple_lsf_dequant.h"
#include "modules/audio_coding/codecs/ilbc/decoder_interpolate_lsf.h"
#include "modules/audio_coding/codecs/ilbc/index_conv_dec.h"
#include "modules/audio_coding/codecs/ilbc/do_plc.h"
#include "modules/audio_coding/codecs/ilbc/constants.h"
#include "modules/audio_coding/codecs/ilbc/enhancer_interface.h"
#include "modules/audio_coding/codecs/ilbc/xcorr_coef.h"
#include "modules/audio_coding/codecs/ilbc/lsf_check.h"
#include "modules/audio_coding/codecs/ilbc/decode_residual.h"
#include "modules/audio_coding/codecs/ilbc/unpack_bits.h"
#include "modules/audio_coding/codecs/ilbc/hp_output.h"
#include "modules/audio_coding/codecs/ilbc/init_decode.h"
#ifndef WEBRTC_ARCH_BIG_ENDIAN
#include "modules/audio_coding/codecs/ilbc/swap_bytes.h"
#endif
/*----------------------------------------------------------------*
* main decoder function
*---------------------------------------------------------------*/
int WebRtcIlbcfix_DecodeImpl(
int16_t *decblock, /* (o) decoded signal block */
const uint16_t *bytes, /* (i) encoded signal bits */
IlbcDecoder *iLBCdec_inst, /* (i/o) the decoder state
structure */
int16_t mode /* (i) 0: bad packet, PLC,
1: normal */
) {
const int old_mode = iLBCdec_inst->mode;
const int old_use_enhancer = iLBCdec_inst->use_enhancer;
size_t 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 */
if (!WebRtcIlbcfix_DecodeResidual(iLBCdec_inst, iLBCbits_inst,
decresidual, syntdenum))
goto error;
/* preparing the plc for a future loss! */
WebRtcIlbcfix_DoThePlc(
PLCresidual, PLClpc, 0, decresidual,
syntdenum + (LPC_FILTERORDER + 1) * (iLBCdec_inst->nsub - 1),
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,
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 */
size_t lag;
/* Find last lag (since the enhancer is not called to give this info) */
lag = 20;
if (iLBCdec_inst->mode==20) {
lag = WebRtcIlbcfix_XcorrCoef(
&decresidual[iLBCdec_inst->blockl-60],
&decresidual[iLBCdec_inst->blockl-60-lag],
60,
80, lag, -1);
} else {
lag = 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 = 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;
}
return 0; // Success.
error:
// The decoder got sick from eating that data. Reset it and return.
WebRtcIlbcfix_InitDecode(iLBCdec_inst, old_mode, old_use_enhancer);
return -1; // Error
}
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