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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.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_SortSq.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/sort_sq.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
/*----------------------------------------------------------------*
* scalar quantization
*---------------------------------------------------------------*/
void WebRtcIlbcfix_SortSq(
int16_t *xq, /* (o) the quantized value */
int16_t *index, /* (o) the quantization index */
int16_t x, /* (i) the value to quantize */
const int16_t *cb, /* (i) the quantization codebook */
int16_t cb_size /* (i) the size of the quantization codebook */
){
int i;
if (x <= cb[0]) {
*index = 0;
*xq = cb[0];
} else {
i = 0;
while ((x > cb[i]) && (i < (cb_size-1))) {
i++;
}
if (x > (((int32_t)cb[i] + cb[i - 1] + 1) >> 1)) {
*index = i;
*xq = cb[i];
} else {
*index = i - 1;
*xq = cb[i - 1];
}
}
}
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