1/*
2 * Musepack decoder
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "get_bits.h"
35#include "dsputil.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 */
44typedef struct {
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
52typedef struct {
53    AVFrame frame;
54    DSPContext dsp;
55    MPADSPContext mpadsp;
56    GetBitContext gb;
57    int IS, MSS, gapless;
58    int lastframelen;
59    int maxbands, last_max_band;
60    int last_bits_used;
61    int oldDSCF[2][BANDS];
62    Band bands[BANDS];
63    int Q[2][MPC_FRAME_SIZE];
64    int cur_frame, frames;
65    uint8_t *bits;
66    int buf_size;
67    AVLFG rnd;
68    int frames_to_skip;
69    /* for synthesis */
70    DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2];
71    int synth_buf_offset[MPA_MAX_CHANNELS];
72    DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
73} MPCContext;
74
75void ff_mpc_init(void);
76void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst, int channels);
77
78#endif /* AVCODEC_MPC_H */
79