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06c2aa9f7b
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}
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_StateConstruct.c
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******************************************************************/
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#include "modules/audio_coding/codecs/ilbc/defines.h"
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#include "modules/audio_coding/codecs/ilbc/constants.h"
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/*----------------------------------------------------------------*
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* decoding of the start state
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_StateConstruct(
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size_t idxForMax, /* (i) 6-bit index for the quantization of
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max amplitude */
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int16_t *idxVec, /* (i) vector of quantization indexes */
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int16_t *syntDenum, /* (i) synthesis filter denumerator */
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int16_t *Out_fix, /* (o) the decoded state vector */
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size_t len /* (i) length of a state vector */
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) {
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size_t k;
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int16_t maxVal;
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int16_t *tmp1, *tmp2, *tmp3;
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/* Stack based */
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int16_t numerator[1+LPC_FILTERORDER];
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int16_t sampleValVec[2*STATE_SHORT_LEN_30MS+LPC_FILTERORDER];
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int16_t sampleMaVec[2*STATE_SHORT_LEN_30MS+LPC_FILTERORDER];
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int16_t *sampleVal = &sampleValVec[LPC_FILTERORDER];
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int16_t *sampleMa = &sampleMaVec[LPC_FILTERORDER];
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int16_t *sampleAr = &sampleValVec[LPC_FILTERORDER];
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/* initialization of coefficients */
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for (k=0; k<LPC_FILTERORDER+1; k++){
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numerator[k] = syntDenum[LPC_FILTERORDER-k];
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}
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/* decoding of the maximum value */
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maxVal = WebRtcIlbcfix_kFrgQuantMod[idxForMax];
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/* decoding of the sample values */
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tmp1 = sampleVal;
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tmp2 = &idxVec[len-1];
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if (idxForMax<37) {
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for(k=0; k<len; k++){
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/*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 2097152 (= 0.5 << 22)
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maxVal is in Q8 and result is in Q(-1) */
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*tmp1 = (int16_t)((maxVal * WebRtcIlbcfix_kStateSq3[*tmp2] + 2097152) >>
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22);
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tmp1++;
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tmp2--;
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}
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} else if (idxForMax<59) {
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for(k=0; k<len; k++){
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/*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 262144 (= 0.5 << 19)
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maxVal is in Q5 and result is in Q(-1) */
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*tmp1 = (int16_t)((maxVal * WebRtcIlbcfix_kStateSq3[*tmp2] + 262144) >>
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19);
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tmp1++;
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tmp2--;
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}
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} else {
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for(k=0; k<len; k++){
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/*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 65536 (= 0.5 << 17)
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maxVal is in Q3 and result is in Q(-1) */
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*tmp1 = (int16_t)((maxVal * WebRtcIlbcfix_kStateSq3[*tmp2] + 65536) >>
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17);
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tmp1++;
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tmp2--;
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}
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}
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/* Set the rest of the data to zero */
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WebRtcSpl_MemSetW16(&sampleVal[len], 0, len);
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/* circular convolution with all-pass filter */
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/* Set the state to zero */
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WebRtcSpl_MemSetW16(sampleValVec, 0, (LPC_FILTERORDER));
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/* Run MA filter + AR filter */
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WebRtcSpl_FilterMAFastQ12(
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sampleVal, sampleMa,
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numerator, LPC_FILTERORDER+1, len + LPC_FILTERORDER);
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WebRtcSpl_MemSetW16(&sampleMa[len + LPC_FILTERORDER], 0, (len - LPC_FILTERORDER));
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WebRtcSpl_FilterARFastQ12(
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sampleMa, sampleAr,
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syntDenum, LPC_FILTERORDER+1, 2 * len);
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tmp1 = &sampleAr[len-1];
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tmp2 = &sampleAr[2*len-1];
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tmp3 = Out_fix;
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for(k=0;k<len;k++){
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(*tmp3) = (*tmp1) + (*tmp2);
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tmp1--;
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tmp2--;
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tmp3++;
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}
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}
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