1/*
2 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11/******************************************************************
12
13 iLBC Speech Coder ANSI-C Source Code
14
15 WebRtcIlbcfix_CbConstruct.c
16
17******************************************************************/
18
19#include "defines.h"
20#include "gain_dequant.h"
21#include "get_cd_vec.h"
22
23/*----------------------------------------------------------------*
24 *  Construct decoded vector from codebook and gains.
25 *---------------------------------------------------------------*/
26
27void WebRtcIlbcfix_CbConstruct(
28    int16_t *decvector,  /* (o) Decoded vector */
29    int16_t *index,   /* (i) Codebook indices */
30    int16_t *gain_index,  /* (i) Gain quantization indices */
31    int16_t *mem,   /* (i) Buffer for codevector construction */
32    int16_t lMem,   /* (i) Length of buffer */
33    int16_t veclen   /* (i) Length of vector */
34                               ){
35  int j;
36  int16_t gain[CB_NSTAGES];
37  /* Stack based */
38  int16_t cbvec0[SUBL];
39  int16_t cbvec1[SUBL];
40  int16_t cbvec2[SUBL];
41  int32_t a32;
42  int16_t *gainPtr;
43
44  /* gain de-quantization */
45
46  gain[0] = WebRtcIlbcfix_GainDequant(gain_index[0], 16384, 0);
47  gain[1] = WebRtcIlbcfix_GainDequant(gain_index[1], gain[0], 1);
48  gain[2] = WebRtcIlbcfix_GainDequant(gain_index[2], gain[1], 2);
49
50  /* codebook vector construction and construction of total vector */
51
52  /* Stack based */
53  WebRtcIlbcfix_GetCbVec(cbvec0, mem, index[0], lMem, veclen);
54  WebRtcIlbcfix_GetCbVec(cbvec1, mem, index[1], lMem, veclen);
55  WebRtcIlbcfix_GetCbVec(cbvec2, mem, index[2], lMem, veclen);
56
57  gainPtr = &gain[0];
58  for (j=0;j<veclen;j++) {
59    a32  = WEBRTC_SPL_MUL_16_16(*gainPtr++, cbvec0[j]);
60    a32 += WEBRTC_SPL_MUL_16_16(*gainPtr++, cbvec1[j]);
61    a32 += WEBRTC_SPL_MUL_16_16(*gainPtr, cbvec2[j]);
62    gainPtr -= 2;
63    decvector[j] = (int16_t) WEBRTC_SPL_RSHIFT_W32(a32 + 8192, 14);
64  }
65
66  return;
67}
68