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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 "libavutil/attributes.h" | |
30 | #include "avcodec.h" | |
31 | #include "get_bits.h" | |
32 | #include "mpegaudiodsp.h" | |
33 | #include "mpegaudio.h" | |
34 | ||
35 | #include "mpc.h" | |
36 | #include "mpcdata.h" | |
37 | ||
38 | av_cold void ff_mpc_init(void) | |
39 | { | |
40 | ff_mpa_synth_init_fixed(ff_mpa_synth_window_fixed); | |
41 | } | |
42 | ||
43 | /** | |
44 | * Process decoded Musepack data and produce PCM | |
45 | */ | |
46 | static void mpc_synth(MPCContext *c, int16_t **out, int channels) | |
47 | { | |
48 | int dither_state = 0; | |
49 | int i, ch; | |
50 | ||
51 | for(ch = 0; ch < channels; ch++){ | |
52 | for(i = 0; i < SAMPLES_PER_BAND; i++) { | |
53 | ff_mpa_synth_filter_fixed(&c->mpadsp, | |
54 | c->synth_buf[ch], &(c->synth_buf_offset[ch]), | |
55 | ff_mpa_synth_window_fixed, &dither_state, | |
56 | out[ch] + 32 * i, 1, | |
57 | c->sb_samples[ch][i]); | |
58 | } | |
59 | } | |
60 | } | |
61 | ||
62 | void ff_mpc_dequantize_and_synth(MPCContext * c, int maxband, int16_t **out, | |
63 | int channels) | |
64 | { | |
65 | int i, j, ch; | |
66 | Band *bands = c->bands; | |
67 | int off; | |
68 | float mul; | |
69 | ||
70 | /* dequantize */ | |
71 | memset(c->sb_samples, 0, sizeof(c->sb_samples)); | |
72 | off = 0; | |
73 | for(i = 0; i <= maxband; i++, off += SAMPLES_PER_BAND){ | |
74 | for(ch = 0; ch < 2; ch++){ | |
75 | if(bands[i].res[ch]){ | |
76 | j = 0; | |
77 | mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][0] & 0xFF]; | |
78 | for(; j < 12; j++) | |
79 | c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off]; | |
80 | mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][1] & 0xFF]; | |
81 | for(; j < 24; j++) | |
82 | c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off]; | |
83 | mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][2] & 0xFF]; | |
84 | for(; j < 36; j++) | |
85 | c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off]; | |
86 | } | |
87 | } | |
88 | if(bands[i].msf){ | |
89 | int t1, t2; | |
90 | for(j = 0; j < SAMPLES_PER_BAND; j++){ | |
91 | t1 = c->sb_samples[0][j][i]; | |
92 | t2 = c->sb_samples[1][j][i]; | |
93 | c->sb_samples[0][j][i] = t1 + t2; | |
94 | c->sb_samples[1][j][i] = t1 - t2; | |
95 | } | |
96 | } | |
97 | } | |
98 | ||
99 | mpc_synth(c, out, channels); | |
100 | } |