Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / 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
24 * Musepack decoder
25 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
26 * divided into 32 subbands.
27 */
28
29 #ifndef AVCODEC_MPC_H
30 #define AVCODEC_MPC_H
31
32 #include "libavutil/lfg.h"
33 #include "avcodec.h"
34 #include "bswapdsp.h"
35 #include "get_bits.h"
36 #include "mpegaudio.h"
37 #include "mpegaudiodsp.h"
38
39 #define BANDS 32
40 #define SAMPLES_PER_BAND 36
41 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
42
43 /** Subband structure - hold all variables for each subband */
44 typedef struct Band {
45 int msf; ///< mid-stereo flag
46 int res[2];
47 int scfi[2];
48 int scf_idx[2][3];
49 int Q[2];
50 }Band;
51
52 typedef struct MPCContext {
53 BswapDSPContext bdsp;
54 MPADSPContext mpadsp;
55 GetBitContext gb;
56 int IS, MSS, gapless;
57 int lastframelen;
58 int maxbands, last_max_band;
59 int last_bits_used;
60 int oldDSCF[2][BANDS];
61 Band bands[BANDS];
62 int Q[2][MPC_FRAME_SIZE];
63 int cur_frame, frames;
64 uint8_t *bits;
65 int buf_size;
66 AVLFG rnd;
67 int frames_to_skip;
68 /* for synthesis */
69 DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2];
70 int synth_buf_offset[MPA_MAX_CHANNELS];
71 DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
72 } MPCContext;
73
74 void ff_mpc_init(void);
75 void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels);
76
77 #endif /* AVCODEC_MPC_H */