0c1548992fb9771c954772a5af4427b4ca8bd33f
[libav.git] / libavcodec / mpc.h
1 /*
2 * Musepack decoder
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 mpc.h Musepack decoder
24 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25 * divided into 32 subbands.
26 */
27
28 #ifndef FFMPEG_MPC_H
29 #define FFMPEG_MPC_H
30
31 #include "libavutil/random.h"
32 #include "avcodec.h"
33 #include "bitstream.h"
34 #include "dsputil.h"
35
36 #ifdef CONFIG_MPEGAUDIO_HP
37 #define USE_HIGHPRECISION
38 #endif
39 #include "mpegaudio.h"
40
41 #include "mpcdata.h"
42
43 #define BANDS 32
44 #define SAMPLES_PER_BAND 36
45 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
46
47 /** Subband structure - hold all variables for each subband */
48 typedef struct {
49 int msf; ///< mid-stereo flag
50 int res[2];
51 int scfi[2];
52 int scf_idx[2][3];
53 int Q[2];
54 }Band;
55
56 typedef struct {
57 DSPContext dsp;
58 GetBitContext gb;
59 int IS, MSS, gapless;
60 int lastframelen;
61 int maxbands, last_max_band;
62 int last_bits_used;
63 int oldDSCF[2][BANDS];
64 Band bands[BANDS];
65 int Q[2][MPC_FRAME_SIZE];
66 int cur_frame, frames;
67 uint8_t *bits;
68 int buf_size;
69 AVRandomState rnd;
70 int frames_to_skip;
71 /* for synthesis */
72 DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]);
73 int synth_buf_offset[MPA_MAX_CHANNELS];
74 DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]);
75 } MPCContext;
76
77 extern void ff_mpc_init();
78 extern void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst);
79
80 #endif /* FFMPEG_MPC_H */