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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}
119 lines
4.2 KiB
C
119 lines
4.2 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_StateSearch.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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#include "modules/audio_coding/codecs/ilbc/abs_quant.h"
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/*----------------------------------------------------------------*
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* encoding of start state
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_StateSearch(
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IlbcEncoder *iLBCenc_inst,
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/* (i) Encoder instance */
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iLBC_bits *iLBC_encbits,/* (i/o) Encoded bits (output idxForMax
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and idxVec, input state_first) */
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int16_t *residual, /* (i) target residual vector */
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int16_t *syntDenum, /* (i) lpc synthesis filter */
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int16_t *weightDenum /* (i) weighting filter denuminator */
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) {
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size_t k, index;
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int16_t maxVal;
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int16_t scale, shift;
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int32_t maxValsq;
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int16_t scaleRes;
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int16_t max;
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int i;
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/* Stack based */
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int16_t numerator[1+LPC_FILTERORDER];
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int16_t residualLongVec[2*STATE_SHORT_LEN_30MS+LPC_FILTERORDER];
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int16_t sampleMa[2*STATE_SHORT_LEN_30MS];
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int16_t *residualLong = &residualLongVec[LPC_FILTERORDER];
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int16_t *sampleAr = residualLong;
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/* Scale to maximum 12 bits to avoid saturation in circular convolution filter */
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max = WebRtcSpl_MaxAbsValueW16(residual, iLBCenc_inst->state_short_len);
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scaleRes = WebRtcSpl_GetSizeInBits(max)-12;
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scaleRes = WEBRTC_SPL_MAX(0, scaleRes);
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/* Set up the filter coefficients for the circular convolution */
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for (i=0; i<LPC_FILTERORDER+1; i++) {
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numerator[i] = (syntDenum[LPC_FILTERORDER-i]>>scaleRes);
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}
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/* Copy the residual to a temporary buffer that we can filter
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* and set the remaining samples to zero.
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*/
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WEBRTC_SPL_MEMCPY_W16(residualLong, residual, iLBCenc_inst->state_short_len);
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WebRtcSpl_MemSetW16(residualLong + iLBCenc_inst->state_short_len, 0, iLBCenc_inst->state_short_len);
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/* Run the Zero-Pole filter (Ciurcular convolution) */
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WebRtcSpl_MemSetW16(residualLongVec, 0, LPC_FILTERORDER);
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WebRtcSpl_FilterMAFastQ12(residualLong, sampleMa, numerator,
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LPC_FILTERORDER + 1,
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iLBCenc_inst->state_short_len + LPC_FILTERORDER);
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WebRtcSpl_MemSetW16(&sampleMa[iLBCenc_inst->state_short_len + LPC_FILTERORDER], 0, iLBCenc_inst->state_short_len - LPC_FILTERORDER);
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WebRtcSpl_FilterARFastQ12(
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sampleMa, sampleAr,
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syntDenum, LPC_FILTERORDER+1, 2 * iLBCenc_inst->state_short_len);
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for(k=0;k<iLBCenc_inst->state_short_len;k++){
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sampleAr[k] += sampleAr[k+iLBCenc_inst->state_short_len];
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}
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/* Find maximum absolute value in the vector */
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maxVal=WebRtcSpl_MaxAbsValueW16(sampleAr, iLBCenc_inst->state_short_len);
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/* Find the best index */
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if ((((int32_t)maxVal)<<scaleRes)<23170) {
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maxValsq=((int32_t)maxVal*maxVal)<<(2+2*scaleRes);
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} else {
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maxValsq=(int32_t)WEBRTC_SPL_WORD32_MAX;
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}
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index=0;
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for (i=0;i<63;i++) {
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if (maxValsq>=WebRtcIlbcfix_kChooseFrgQuant[i]) {
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index=i+1;
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} else {
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i=63;
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}
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}
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iLBC_encbits->idxForMax=index;
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/* Rescale the vector before quantization */
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scale=WebRtcIlbcfix_kScale[index];
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if (index<27) { /* scale table is in Q16, fout[] is in Q(-1) and we want the result to be in Q11 */
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shift=4;
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} else { /* scale table is in Q21, fout[] is in Q(-1) and we want the result to be in Q11 */
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shift=9;
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}
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/* Set up vectors for AbsQuant and rescale it with the scale factor */
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WebRtcSpl_ScaleVectorWithSat(sampleAr, sampleAr, scale,
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iLBCenc_inst->state_short_len, (int16_t)(shift-scaleRes));
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/* Quantize the values in fout[] */
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WebRtcIlbcfix_AbsQuant(iLBCenc_inst, iLBC_encbits, sampleAr, weightDenum);
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return;
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}
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