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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_CbConstruct.c
******************************************************************/
#include "defines.h"
#include "gain_dequant.h"
#include "get_cd_vec.h"
/*----------------------------------------------------------------*
* Construct decoded vector from codebook and gains.
*---------------------------------------------------------------*/
void WebRtcIlbcfix_CbConstruct(
int16_t *decvector, /* (o) Decoded vector */
int16_t *index, /* (i) Codebook indices */
int16_t *gain_index, /* (i) Gain quantization indices */
int16_t *mem, /* (i) Buffer for codevector construction */
int16_t lMem, /* (i) Length of buffer */
int16_t veclen /* (i) Length of vector */
){
int j;
int16_t gain[CB_NSTAGES];
/* Stack based */
int16_t cbvec0[SUBL];
int16_t cbvec1[SUBL];
int16_t cbvec2[SUBL];
int32_t a32;
int16_t *gainPtr;
/* gain de-quantization */
gain[0] = WebRtcIlbcfix_GainDequant(gain_index[0], 16384, 0);
gain[1] = WebRtcIlbcfix_GainDequant(gain_index[1], gain[0], 1);
gain[2] = WebRtcIlbcfix_GainDequant(gain_index[2], gain[1], 2);
/* codebook vector construction and construction of total vector */
/* Stack based */
WebRtcIlbcfix_GetCbVec(cbvec0, mem, index[0], lMem, veclen);
WebRtcIlbcfix_GetCbVec(cbvec1, mem, index[1], lMem, veclen);
WebRtcIlbcfix_GetCbVec(cbvec2, mem, index[2], lMem, veclen);
gainPtr = &gain[0];
for (j=0;j<veclen;j++) {
a32 = WEBRTC_SPL_MUL_16_16(*gainPtr++, cbvec0[j]);
a32 += WEBRTC_SPL_MUL_16_16(*gainPtr++, cbvec1[j]);
a32 += WEBRTC_SPL_MUL_16_16(*gainPtr, cbvec2[j]);
gainPtr -= 2;
decvector[j] = (int16_t)((a32 + 8192) >> 14);
}
return;
}
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