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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/******************************************************************
IiLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_IndexConvEnc.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/index_conv_enc.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
/*----------------------------------------------------------------*
* Convert the codebook indexes to make the search easier
*---------------------------------------------------------------*/
void WebRtcIlbcfix_IndexConvEnc(
int16_t *index /* (i/o) Codebook indexes */
){
int k;
for (k=4;k<6;k++) {
/* Readjust the second and third codebook index so that it is
packetized into 7 bits (before it was put in lag-wise the same
way as for the first codebook which uses 8 bits)
*/
if ((index[k]>=108)&&(index[k]<172)) {
index[k]-=64;
} else if (index[k]>=236) {
index[k]-=128;
} else {
/* ERROR */
}
}
}