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
34
37
39 {
41 }
42
43 /**
44 * Process decoded Musepack data and produce PCM
45 */
47 {
48 int dither_state = 0;
49 int i, ch;
50
51 for(ch = 0; ch < channels; ch++){
56 out[ch] + 32 * i, 1,
58 }
59 }
60 }
61
63 int channels)
64 {
65 int i, j, ch;
68 float mul;
69
70 /* dequantize */
72 off = 0;
74 for(ch = 0; ch < 2; 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++)
81 for(; j < 24; j++)
84 for(; j < 36; j++)
86 }
87 }
88 if(bands[i].msf){
95 }
96 }
97 }
98
100 }