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source:
webrtc/webrtc/modules/audio_coding/codecs/ilbc/decoder_interpolate_lsf.c
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0:4bda6873e34c
Last change on this file since 0:4bda6873e34c was 0:4bda6873e34c, checked in by , 6 years ago | |
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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 | |
28 | void 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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