68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*
|
|
* 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(
|
|
WebRtc_Word16 *decvector, /* (o) Decoded vector */
|
|
WebRtc_Word16 *index, /* (i) Codebook indices */
|
|
WebRtc_Word16 *gain_index, /* (i) Gain quantization indices */
|
|
WebRtc_Word16 *mem, /* (i) Buffer for codevector construction */
|
|
WebRtc_Word16 lMem, /* (i) Length of buffer */
|
|
WebRtc_Word16 veclen /* (i) Length of vector */
|
|
){
|
|
int j;
|
|
WebRtc_Word16 gain[CB_NSTAGES];
|
|
/* Stack based */
|
|
WebRtc_Word16 cbvec0[SUBL];
|
|
WebRtc_Word16 cbvec1[SUBL];
|
|
WebRtc_Word16 cbvec2[SUBL];
|
|
WebRtc_Word32 a32;
|
|
WebRtc_Word16 *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] = (WebRtc_Word16) WEBRTC_SPL_RSHIFT_W32(a32 + 8192, 14);
|
|
}
|
|
|
|
return;
|
|
}
|