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source: webrtc/webrtc/modules/audio_coding/codecs/ilbc/decoder_interpolate_lsf.c @ 0:4bda6873e34c

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Last change on this file since 0:4bda6873e34c was 0:4bda6873e34c, checked in by Michael Prittie <mprittie@…>, 6 years ago

Scrubbed password for publication.

File size: 3.2 KB
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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_DecoderInterpolateLsp.c
16
17******************************************************************/
18
19#include "lsf_interpolate_to_poly_dec.h"
20#include "bw_expand.h"
21#include "defines.h"
22#include "constants.h"
23
24/*----------------------------------------------------------------*
25 *  obtain synthesis and weighting filters form lsf coefficients
26 *---------------------------------------------------------------*/
27
28void WebRtcIlbcfix_DecoderInterpolateLsp(
29    int16_t *syntdenum,  /* (o) synthesis filter coefficients */
30    int16_t *weightdenum, /* (o) weighting denumerator
31                                   coefficients */
32    int16_t *lsfdeq,   /* (i) dequantized lsf coefficients */
33    int16_t length,   /* (i) length of lsf coefficient vector */
34    iLBC_Dec_Inst_t *iLBCdec_inst
35    /* (i) the decoder state structure */
36                                          ){
37  int  i, pos, lp_length;
38  int16_t  lp[LPC_FILTERORDER + 1], *lsfdeq2;
39
40  lsfdeq2 = lsfdeq + length;
41  lp_length = length + 1;
42
43  if (iLBCdec_inst->mode==30) {
44    /* subframe 1: Interpolation between old and first LSF */
45
46    WebRtcIlbcfix_LspInterpolate2PolyDec(lp, (*iLBCdec_inst).lsfdeqold, lsfdeq,
47                                         WebRtcIlbcfix_kLsfWeight30ms[0], length);
48    WEBRTC_SPL_MEMCPY_W16(syntdenum,lp,lp_length);
49    WebRtcIlbcfix_BwExpand(weightdenum, lp, (int16_t*)WebRtcIlbcfix_kLpcChirpSyntDenum, (int16_t)lp_length);
50
51    /* subframes 2 to 6: interpolation between first and last LSF */
52
53    pos = lp_length;
54    for (i = 1; i < 6; i++) {
55      WebRtcIlbcfix_LspInterpolate2PolyDec(lp, lsfdeq, lsfdeq2,
56                                           WebRtcIlbcfix_kLsfWeight30ms[i], length);
57      WEBRTC_SPL_MEMCPY_W16(syntdenum + pos,lp,lp_length);
58      WebRtcIlbcfix_BwExpand(weightdenum + pos, lp,
59                             (int16_t*)WebRtcIlbcfix_kLpcChirpSyntDenum, (int16_t)lp_length);
60      pos += lp_length;
61    }
62  } else { /* iLBCdec_inst->mode=20 */
63    /* subframes 1 to 4: interpolation between old and new LSF */
64    pos = 0;
65    for (i = 0; i < iLBCdec_inst->nsub; i++) {
66      WebRtcIlbcfix_LspInterpolate2PolyDec(lp, iLBCdec_inst->lsfdeqold, lsfdeq,
67                                           WebRtcIlbcfix_kLsfWeight20ms[i], length);
68      WEBRTC_SPL_MEMCPY_W16(syntdenum+pos,lp,lp_length);
69      WebRtcIlbcfix_BwExpand(weightdenum+pos, lp,
70                             (int16_t*)WebRtcIlbcfix_kLpcChirpSyntDenum, (int16_t)lp_length);
71      pos += lp_length;
72    }
73  }
74
75  /* update memory */
76
77  if (iLBCdec_inst->mode==30) {
78    WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->lsfdeqold, lsfdeq2, length);
79  } else {
80    WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->lsfdeqold, lsfdeq, length);
81  }
82}
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