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[ACM] iSAC audio codec removed

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Note: this CL has to leave behind one part of iSAC, which is its VAD
currently used by AGC1 in APM. The target visibility has been
restricted and the VAD will be removed together with AGC1 when the
time comes.

Tested: see https://chromium-review.googlesource.com/c/chromium/src/+/4013319

Bug: webrtc:14450
Change-Id: I69cc518b16280eae62a1f1977cdbfa24c08cf5f9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/282421
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38652}
This commit is contained in:
Alessio Bazzica
2022-11-11 16:52:46 +01:00
committed by WebRTC LUCI CQ
parent 6aa755c201
commit b46c4bf27b
164 changed files with 117 additions and 39429 deletions
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221
modules/audio_coding/codecs/isac/fix/source/decode.c
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@ -1,221 +0,0 @@
/*
* 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.
*/
/*
* decode.c
*
* This C file contains the internal decoding function.
*
*/
#include <string.h>
#include "modules/audio_coding/codecs/isac/fix/source/bandwidth_estimator.h"
#include "modules/audio_coding/codecs/isac/fix/source/codec.h"
#include "modules/audio_coding/codecs/isac/fix/source/entropy_coding.h"
#include "modules/audio_coding/codecs/isac/fix/source/pitch_estimator.h"
#include "modules/audio_coding/codecs/isac/fix/source/settings.h"
#include "modules/audio_coding/codecs/isac/fix/source/structs.h"
int WebRtcIsacfix_DecodeImpl(int16_t* signal_out16,
IsacFixDecoderInstance* ISACdec_obj,
size_t* current_framesamples)
{
int k;
int err;
int16_t BWno;
int len = 0;
int16_t model;
int16_t Vector_Word16_1[FRAMESAMPLES/2];
int16_t Vector_Word16_2[FRAMESAMPLES/2];
int32_t Vector_Word32_1[FRAMESAMPLES/2];
int32_t Vector_Word32_2[FRAMESAMPLES/2];
int16_t lofilt_coefQ15[ORDERLO*SUBFRAMES]; //refl. coeffs
int16_t hifilt_coefQ15[ORDERHI*SUBFRAMES]; //refl. coeffs
int32_t gain_lo_hiQ17[2*SUBFRAMES];
int16_t PitchLags_Q7[PITCH_SUBFRAMES];
int16_t PitchGains_Q12[PITCH_SUBFRAMES];
int16_t AvgPitchGain_Q12;
int16_t tmp_1, tmp_2;
int32_t tmp32a;
int16_t gainQ13;
size_t frame_nb; /* counter */
size_t frame_mode; /* 0 for 30ms, 1 for 60ms */
static const size_t kProcessedSamples = 480; /* 480 (for both 30, 60 ms) */
/* PLC */
int16_t overlapWin[ 240 ];
(ISACdec_obj->bitstr_obj).W_upper = 0xFFFFFFFF;
(ISACdec_obj->bitstr_obj).streamval = 0;
(ISACdec_obj->bitstr_obj).stream_index = 0;
(ISACdec_obj->bitstr_obj).full = 1;
/* decode framelength and BW estimation - not used, only for stream pointer*/
err = WebRtcIsacfix_DecodeFrameLen(&ISACdec_obj->bitstr_obj, current_framesamples);
if (err<0) // error check
return err;
frame_mode = *current_framesamples / MAX_FRAMESAMPLES; /* 0, or 1 */
err = WebRtcIsacfix_DecodeSendBandwidth(&ISACdec_obj->bitstr_obj, &BWno);
if (err<0) // error check
return err;
/* one loop if it's one frame (30ms), two loops if two frames bundled together
* (60ms) */
for (frame_nb = 0; frame_nb <= frame_mode; frame_nb++) {
/* decode & dequantize pitch parameters */
err = WebRtcIsacfix_DecodePitchGain(&(ISACdec_obj->bitstr_obj), PitchGains_Q12);
if (err<0) // error check
return err;
err = WebRtcIsacfix_DecodePitchLag(&ISACdec_obj->bitstr_obj, PitchGains_Q12, PitchLags_Q7);
if (err<0) // error check
return err;
AvgPitchGain_Q12 = (int16_t)(((int32_t)PitchGains_Q12[0] + PitchGains_Q12[1] + PitchGains_Q12[2] + PitchGains_Q12[3])>>2);
/* decode & dequantize FiltCoef */
err = WebRtcIsacfix_DecodeLpc(gain_lo_hiQ17, lofilt_coefQ15, hifilt_coefQ15,
&ISACdec_obj->bitstr_obj, &model);
if (err<0) // error check
return err;
/* decode & dequantize spectrum */
len = WebRtcIsacfix_DecodeSpec(&ISACdec_obj->bitstr_obj, Vector_Word16_1, Vector_Word16_2, AvgPitchGain_Q12);
if (len < 0) // error check
return len;
// Why does this need Q16 in and out? /JS
WebRtcIsacfix_Spec2Time(Vector_Word16_1, Vector_Word16_2, Vector_Word32_1, Vector_Word32_2);
for (k=0; k<FRAMESAMPLES/2; k++) {
// Q16 -> Q9.
Vector_Word16_1[k] = (int16_t)((Vector_Word32_1[k] + 64) >> 7);
}
/* ---- If this is recovery frame ---- */
if( (ISACdec_obj->plcstr_obj).used == PLC_WAS_USED )
{
(ISACdec_obj->plcstr_obj).used = PLC_NOT_USED;
if( (ISACdec_obj->plcstr_obj).B < 1000 )
{
(ISACdec_obj->plcstr_obj).decayCoeffPriodic = 4000;
}
ISACdec_obj->plcstr_obj.decayCoeffPriodic = WEBRTC_SPL_WORD16_MAX; /* DECAY_RATE is in Q15 */
ISACdec_obj->plcstr_obj.decayCoeffNoise = WEBRTC_SPL_WORD16_MAX; /* DECAY_RATE is in Q15 */
ISACdec_obj->plcstr_obj.pitchCycles = 0;
PitchGains_Q12[0] = (int16_t)(PitchGains_Q12[0] * 700 >> 10);
/* ---- Add-overlap ---- */
WebRtcSpl_GetHanningWindow( overlapWin, RECOVERY_OVERLAP );
for( k = 0; k < RECOVERY_OVERLAP; k++ )
Vector_Word16_1[k] = WebRtcSpl_AddSatW16(
(int16_t)(ISACdec_obj->plcstr_obj.overlapLP[k] *
overlapWin[RECOVERY_OVERLAP - k - 1] >> 14),
(int16_t)(Vector_Word16_1[k] * overlapWin[k] >> 14));
}
/* --- Store side info --- */
if( frame_nb == frame_mode )
{
/* --- LPC info */
WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).lofilt_coefQ15, &lofilt_coefQ15[(SUBFRAMES-1)*ORDERLO], ORDERLO );
WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).hifilt_coefQ15, &hifilt_coefQ15[(SUBFRAMES-1)*ORDERHI], ORDERHI );
(ISACdec_obj->plcstr_obj).gain_lo_hiQ17[0] = gain_lo_hiQ17[(SUBFRAMES-1) * 2];
(ISACdec_obj->plcstr_obj).gain_lo_hiQ17[1] = gain_lo_hiQ17[(SUBFRAMES-1) * 2 + 1];
/* --- LTP info */
(ISACdec_obj->plcstr_obj).AvgPitchGain_Q12 = PitchGains_Q12[3];
(ISACdec_obj->plcstr_obj).lastPitchGain_Q12 = PitchGains_Q12[3];
(ISACdec_obj->plcstr_obj).lastPitchLag_Q7 = PitchLags_Q7[3];
if( PitchLags_Q7[3] < 3000 )
(ISACdec_obj->plcstr_obj).lastPitchLag_Q7 += PitchLags_Q7[3];
WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).prevPitchInvIn, Vector_Word16_1, FRAMESAMPLES/2 );
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
/* inverse pitch filter */
WebRtcIsacfix_PitchFilter(Vector_Word16_1, Vector_Word16_2, &ISACdec_obj->pitchfiltstr_obj, PitchLags_Q7, PitchGains_Q12, 4);
if( frame_nb == frame_mode )
{
WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).prevPitchInvOut, &(Vector_Word16_2[FRAMESAMPLES/2 - (PITCH_MAX_LAG + 10)]), PITCH_MAX_LAG );
}
/* reduce gain to compensate for pitch enhancer */
/* gain = 1.0f - 0.45f * AvgPitchGain; */
tmp32a = AvgPitchGain_Q12 * 29; // Q18
gainQ13 = (int16_t)((262144 - tmp32a) >> 5); // Q18 -> Q13.
for (k = 0; k < FRAMESAMPLES/2; k++)
{
Vector_Word32_1[k] = (Vector_Word16_2[k] * gainQ13) * (1 << 3); // Q25
}
/* perceptual post-filtering (using normalized lattice filter) */
WebRtcIsacfix_NormLatticeFilterAr(ORDERLO, (ISACdec_obj->maskfiltstr_obj).PostStateLoGQ0,
Vector_Word32_1, lofilt_coefQ15, gain_lo_hiQ17, 0, Vector_Word16_1);
/* --- Store Highpass Residual --- */
for (k = 0; k < FRAMESAMPLES/2; k++)
Vector_Word32_1[k] = Vector_Word32_2[k] * (1 << 9); // Q16 -> Q25
for( k = 0; k < PITCH_MAX_LAG + 10; k++ )
(ISACdec_obj->plcstr_obj).prevHP[k] = Vector_Word32_1[FRAMESAMPLES/2 - (PITCH_MAX_LAG + 10) + k];
WebRtcIsacfix_NormLatticeFilterAr(ORDERHI, (ISACdec_obj->maskfiltstr_obj).PostStateHiGQ0,
Vector_Word32_1, hifilt_coefQ15, gain_lo_hiQ17, 1, Vector_Word16_2);
/* recombine the 2 bands */
/* Form the polyphase signals, and compensate for DC offset */
for (k=0;k<FRAMESAMPLES/2;k++) {
tmp_1 = (int16_t)WebRtcSpl_SatW32ToW16(((int32_t)Vector_Word16_1[k]+Vector_Word16_2[k] + 1)); /* Construct a new upper channel signal*/
tmp_2 = (int16_t)WebRtcSpl_SatW32ToW16(((int32_t)Vector_Word16_1[k]-Vector_Word16_2[k])); /* Construct a new lower channel signal*/
Vector_Word16_1[k] = tmp_1;
Vector_Word16_2[k] = tmp_2;
}
WebRtcIsacfix_FilterAndCombine1(Vector_Word16_1,
Vector_Word16_2,
signal_out16 + frame_nb * kProcessedSamples,
&ISACdec_obj->postfiltbankstr_obj);
}
return len;
}