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 "get_bits.h"
35#include "dsputil.h"
36#include "mpegaudio.h"
37
38#include "mpcdata.h"
39
40#define BANDS            32
41#define SAMPLES_PER_BAND 36
42#define MPC_FRAME_SIZE   (BANDS * SAMPLES_PER_BAND)
43
44/** Subband structure - hold all variables for each subband */
45typedef struct {
46    int msf; ///< mid-stereo flag
47    int res[2];
48    int scfi[2];
49    int scf_idx[2][3];
50    int Q[2];
51}Band;
52
53typedef struct {
54    DSPContext dsp;
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
74void ff_mpc_init(void);
75void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst);
76
77#endif /* AVCODEC_MPC_H */
78