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3111783aa1
Prior to this commit, most .c files in modules/audio_coding/codecs/ilbc don't include their corresponding headers, nor do they order #includes as per the Google Style Guide [1]. The former is especially harmful, since in C it can silently allow the function signature to diverge from its prototype, thus causing disaster at runtime. This CL fixes both issues. In effect, this allows the common_audio and modules/audio_coding:ilbc targets to be compiled with Clang's -Wmissing-prototypes, though this CL does not add that change. [1]: https://google.github.io/styleguide/cppguide.html#Names_and_Order_of_Includes Bug: webrtc:12314 Change-Id: I8299968ed3cc86ff35d9de045072b846298043af Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/198362 Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Commit-Queue: Timothy Gu <timothygu@chromium.org> Cr-Commit-Position: refs/heads/master@{#32896}
89 lines
2.9 KiB
C
89 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/cb_update_best_index.h"
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#include "modules/audio_coding/codecs/ilbc/constants.h"
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#include "modules/audio_coding/codecs/ilbc/defines.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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