FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpc.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 34 34 100.0%
Branches: 20 20 100.0%

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1 /*
2 * Musepack decoder core
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Musepack decoder core
25 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
26 * divided into 32 subbands.
27 */
28
29 #include <string.h>
30 #include "libavutil/intmath.h"
31 #include "mpegaudiodsp.h"
32
33 #include "mpc.h"
34 #include "mpcdata.h"
35
36 /**
37 * Process decoded Musepack data and produce PCM
38 */
39 914 static void mpc_synth(MPCContext *c, int16_t **out, int channels)
40 {
41 914 int dither_state = 0;
42 int i, ch;
43
44
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2742 for(ch = 0; ch < channels; ch++){
45
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67636 for(i = 0; i < SAMPLES_PER_BAND; i++) {
46 65808 ff_mpa_synth_filter_fixed(&c->mpadsp,
47 65808 c->synth_buf[ch], &(c->synth_buf_offset[ch]),
48 ff_mpa_synth_window_fixed, &dither_state,
49 65808 out[ch] + 32 * i, 1,
50 65808 c->sb_samples[ch][i]);
51 }
52 }
53 914 }
54
55 914 void ff_mpc_dequantize_and_synth(MPCContext * c, int maxband, int16_t **out,
56 int channels)
57 {
58 int i, j, ch;
59 914 Band *bands = c->bands;
60 int off;
61 float mul;
62
63 /* dequantize */
64 914 memset(c->sb_samples, 0, sizeof(c->sb_samples));
65 914 off = 0;
66
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21742 for(i = 0; i <= maxband; i++, off += SAMPLES_PER_BAND){
67
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62484 for(ch = 0; ch < 2; ch++){
68
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41656 if(bands[i].res[ch]){
69 36564 j = 0;
70 36564 mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][0] & 0xFF];
71
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475332 for(; j < 12; j++)
72 438768 c->sb_samples[ch][j][i] = av_clipf(mul * c->Q[ch][j + off], INT32_MIN, INT32_MAX);
73 36564 mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][1] & 0xFF];
74
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75 438768 c->sb_samples[ch][j][i] = av_clipf(mul * c->Q[ch][j + off], INT32_MIN, INT32_MAX);
76 36564 mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][2] & 0xFF];
77
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78 438768 c->sb_samples[ch][j][i] = av_clipf(mul * c->Q[ch][j + off], INT32_MIN, INT32_MAX);
79 }
80 }
81
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20828 if(bands[i].msf){
82 unsigned t1, t2;
83
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453250 for(j = 0; j < SAMPLES_PER_BAND; j++){
84 441000 t1 = c->sb_samples[0][j][i];
85 441000 t2 = c->sb_samples[1][j][i];
86 441000 c->sb_samples[0][j][i] = t1 + t2;
87 441000 c->sb_samples[1][j][i] = t1 - t2;
88 }
89 }
90 }
91
92 914 mpc_synth(c, out, channels);
93 914 }
94