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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
2.9 KiB
C
88 lines
2.9 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_CbUpdateBestIndex.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/cb_update_best_index.h"
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#include "modules/audio_coding/codecs/ilbc/constants.h"
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void WebRtcIlbcfix_CbUpdateBestIndex(
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int32_t CritNew, /* (i) New Potentially best Criteria */
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int16_t CritNewSh, /* (i) Shift value of above Criteria */
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size_t IndexNew, /* (i) Index of new Criteria */
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int32_t cDotNew, /* (i) Cross dot of new index */
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int16_t invEnergyNew, /* (i) Inversed energy new index */
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int16_t energyShiftNew, /* (i) Energy shifts of new index */
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int32_t *CritMax, /* (i/o) Maximum Criteria (so far) */
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int16_t *shTotMax, /* (i/o) Shifts of maximum criteria */
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size_t *bestIndex, /* (i/o) Index that corresponds to
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maximum criteria */
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int16_t *bestGain) /* (i/o) Gain in Q14 that corresponds
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to maximum criteria */
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{
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int16_t shOld, shNew, tmp16;
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int16_t scaleTmp;
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int32_t gainW32;
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/* Normalize the new and old Criteria to the same domain */
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if (CritNewSh>(*shTotMax)) {
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shOld=WEBRTC_SPL_MIN(31,CritNewSh-(*shTotMax));
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shNew=0;
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} else {
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shOld=0;
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shNew=WEBRTC_SPL_MIN(31,(*shTotMax)-CritNewSh);
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}
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/* Compare the two criterias. If the new one is better,
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calculate the gain and store this index as the new best one
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*/
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if ((CritNew >> shNew) > (*CritMax >> shOld)) {
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tmp16 = (int16_t)WebRtcSpl_NormW32(cDotNew);
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tmp16 = 16 - tmp16;
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/* Calculate the gain in Q14
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Compensate for inverseEnergyshift in Q29 and that the energy
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value was stored in a int16_t (shifted down 16 steps)
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=> 29-14+16 = 31 */
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scaleTmp = -energyShiftNew-tmp16+31;
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scaleTmp = WEBRTC_SPL_MIN(31, scaleTmp);
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gainW32 = ((int16_t)WEBRTC_SPL_SHIFT_W32(cDotNew, -tmp16) * invEnergyNew) >>
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scaleTmp;
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/* Check if criteria satisfies Gain criteria (max 1.3)
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if it is larger set the gain to 1.3
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(slightly different from FLP version)
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*/
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if (gainW32>21299) {
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*bestGain=21299;
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} else if (gainW32<-21299) {
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*bestGain=-21299;
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} else {
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*bestGain=(int16_t)gainW32;
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}
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*CritMax=CritNew;
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*shTotMax=CritNewSh;
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*bestIndex = IndexNew;
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}
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return;
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}
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