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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}
71 lines
2 KiB
C
71 lines
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_LsfCheck.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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* check for stability of lsf coefficients
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*---------------------------------------------------------------*/
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int WebRtcIlbcfix_LsfCheck(
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int16_t *lsf, /* LSF parameters */
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int dim, /* dimension of LSF */
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int NoAn) /* No of analysis per frame */
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{
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int k,n,m, Nit=2, change=0,pos;
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const int16_t eps=319; /* 0.039 in Q13 (50 Hz)*/
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const int16_t eps2=160; /* eps/2.0 in Q13;*/
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const int16_t maxlsf=25723; /* 3.14; (4000 Hz)*/
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const int16_t minlsf=82; /* 0.01; (0 Hz)*/
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/* LSF separation check*/
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for (n=0;n<Nit;n++) { /* Run through a 2 times */
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for (m=0;m<NoAn;m++) { /* Number of analyses per frame */
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for (k=0;k<(dim-1);k++) {
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pos=m*dim+k;
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/* Seperate coefficients with a safety margin of 50 Hz */
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if ((lsf[pos+1]-lsf[pos])<eps) {
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if (lsf[pos+1]<lsf[pos]) {
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lsf[pos+1]= lsf[pos]+eps2;
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lsf[pos]= lsf[pos+1]-eps2;
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} else {
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lsf[pos]-=eps2;
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lsf[pos+1]+=eps2;
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}
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change=1;
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}
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/* Limit minimum and maximum LSF */
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if (lsf[pos]<minlsf) {
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lsf[pos]=minlsf;
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change=1;
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}
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if (lsf[pos]>maxlsf) {
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lsf[pos]=maxlsf;
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change=1;
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}
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}
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}
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}
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return change;
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}
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