Source code
Revision control
Copy as Markdown
Other Tools
/*
* 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_SimpleLsfQ.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/simple_lsf_quant.h"
#include "modules/audio_coding/codecs/ilbc/constants.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
#include "modules/audio_coding/codecs/ilbc/split_vq.h"
/*----------------------------------------------------------------*
* lsf quantizer (subrutine to LPCencode)
*---------------------------------------------------------------*/
void WebRtcIlbcfix_SimpleLsfQ(
int16_t *lsfdeq, /* (o) dequantized lsf coefficients
(dimension FILTERORDER) Q13 */
int16_t *index, /* (o) quantization index */
int16_t *lsf, /* (i) the lsf coefficient vector to be
quantized (dimension FILTERORDER) Q13 */
int16_t lpc_n /* (i) number of lsf sets to quantize */
){
/* Quantize first LSF with memoryless split VQ */
WebRtcIlbcfix_SplitVq( lsfdeq, index, lsf,
(int16_t*)WebRtcIlbcfix_kLsfCb, (int16_t*)WebRtcIlbcfix_kLsfDimCb, (int16_t*)WebRtcIlbcfix_kLsfSizeCb);
if (lpc_n==2) {
/* Quantize second LSF with memoryless split VQ */
WebRtcIlbcfix_SplitVq( lsfdeq + LPC_FILTERORDER, index + LSF_NSPLIT,
lsf + LPC_FILTERORDER, (int16_t*)WebRtcIlbcfix_kLsfCb,
(int16_t*)WebRtcIlbcfix_kLsfDimCb, (int16_t*)WebRtcIlbcfix_kLsfSizeCb);
}
return;
}