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bb547203bf
In order to eliminate the WebRTC Subtree mirror in Chromium, WebRTC is moving the content of the src/webrtc directory up to the src/ directory. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38 Reviewed-on: https://webrtc-review.googlesource.com/1560 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19845}
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_CbUpdateBestIndex.c
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******************************************************************/
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#include "defines.h"
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#include "cb_update_best_index.h"
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#include "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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