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/libavcodec/mpc.h

http://github.com/FFmpeg/FFmpeg
C Header | 76 lines | 39 code | 9 blank | 28 comment | 0 complexity | 6c36782f5fab1b1d8e56e27116c0e912 MD5 | raw file
 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
34#include "avcodec.h"
35#include "bswapdsp.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 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
52typedef struct MPCContext {
53    BswapDSPContext bdsp;
54    MPADSPContext mpadsp;
55    int IS, MSS, gapless;
56    int lastframelen;
57    int maxbands, last_max_band;
58    int last_bits_used;
59    int oldDSCF[2][BANDS];
60    Band bands[BANDS];
61    int Q[2][MPC_FRAME_SIZE];
62    int cur_frame, frames;
63    uint8_t *bits;
64    int buf_size;
65    AVLFG rnd;
66    int frames_to_skip;
67    /* for synthesis */
68    DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2];
69    int synth_buf_offset[MPA_MAX_CHANNELS];
70    DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
71} MPCContext;
72
73void ff_mpc_init(void);
74void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels);
75
76#endif /* AVCODEC_MPC_H */