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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}
88 lines
2.8 KiB
C
88 lines
2.8 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_FrameClassify.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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* Classification of subframes to localize start state
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*---------------------------------------------------------------*/
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size_t WebRtcIlbcfix_FrameClassify(
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/* (o) Index to the max-energy sub frame */
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IlbcEncoder *iLBCenc_inst,
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/* (i/o) the encoder state structure */
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int16_t *residualFIX /* (i) lpc residual signal */
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){
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int16_t max, scale;
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int32_t ssqEn[NSUB_MAX-1];
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int16_t *ssqPtr;
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int32_t *seqEnPtr;
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int32_t maxW32;
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int16_t scale1;
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size_t pos;
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size_t n;
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/*
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Calculate the energy of each of the 80 sample blocks
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in the draft the 4 first and last samples are windowed with 1/5...4/5
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and 4/5...1/5 respectively. To simplify for the fixpoint we have changed
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this to 0 0 1 1 and 1 1 0 0
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*/
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max = WebRtcSpl_MaxAbsValueW16(residualFIX, iLBCenc_inst->blockl);
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scale = WebRtcSpl_GetSizeInBits((uint32_t)(max * max));
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/* Scale to maximum 24 bits so that it won't overflow for 76 samples */
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scale = scale-24;
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scale1 = WEBRTC_SPL_MAX(0, scale);
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/* Calculate energies */
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ssqPtr=residualFIX + 2;
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seqEnPtr=ssqEn;
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for (n=(iLBCenc_inst->nsub-1); n>0; n--) {
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(*seqEnPtr) = WebRtcSpl_DotProductWithScale(ssqPtr, ssqPtr, 76, scale1);
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ssqPtr += 40;
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seqEnPtr++;
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}
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/* Scale to maximum 20 bits in order to allow for the 11 bit window */
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maxW32 = WebRtcSpl_MaxValueW32(ssqEn, iLBCenc_inst->nsub - 1);
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scale = WebRtcSpl_GetSizeInBits(maxW32) - 20;
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scale1 = WEBRTC_SPL_MAX(0, scale);
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/* Window each 80 block with the ssqEn_winTbl window to give higher probability for
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the blocks in the middle
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*/
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seqEnPtr=ssqEn;
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if (iLBCenc_inst->mode==20) {
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ssqPtr=(int16_t*)WebRtcIlbcfix_kStartSequenceEnrgWin+1;
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} else {
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ssqPtr=(int16_t*)WebRtcIlbcfix_kStartSequenceEnrgWin;
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}
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for (n=(iLBCenc_inst->nsub-1); n>0; n--) {
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(*seqEnPtr)=WEBRTC_SPL_MUL(((*seqEnPtr)>>scale1), (*ssqPtr));
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seqEnPtr++;
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ssqPtr++;
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}
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/* Extract the best choise of start state */
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pos = WebRtcSpl_MaxIndexW32(ssqEn, iLBCenc_inst->nsub - 1) + 1;
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return(pos);
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}
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