1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/*
* Musepack decoder
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavcodec/mpc.h Musepack decoder
* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
* divided into 32 subbands.
*/
#ifndef AVCODEC_MPC_H
#define AVCODEC_MPC_H
#include "libavutil/lfg.h"
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "mpegaudio.h"
#include "mpcdata.h"
#define BANDS 32
#define SAMPLES_PER_BAND 36
#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
/** Subband structure - hold all variables for each subband */
typedef struct {
int msf; ///< mid-stereo flag
int res[2];
int scfi[2];
int scf_idx[2][3];
int Q[2];
}Band;
typedef struct {
DSPContext dsp;
GetBitContext gb;
int IS, MSS, gapless;
int lastframelen;
int maxbands, last_max_band;
int last_bits_used;
int oldDSCF[2][BANDS];
Band bands[BANDS];
int Q[2][MPC_FRAME_SIZE];
int cur_frame, frames;
uint8_t *bits;
int buf_size;
AVLFG rnd;
int frames_to_skip;
/* for synthesis */
DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]);
int synth_buf_offset[MPA_MAX_CHANNELS];
DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]);
} MPCContext;
void ff_mpc_init(void);
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst);
#endif /* AVCODEC_MPC_H */
|
