FFmpeg/libavcodec/mpc.h
Kostya Shishkov 7d3829a87a Musepack SV8 supports "mono" files (though it still codes them as stereo),
so extend decoder to output only one channel for it.

This fixes issue 2368.

Originally committed as revision 25790 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-11-21 20:42:06 +00:00

78 lines
2.1 KiB
C

/*
* Musepack decoder
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Musepack decoder
* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
* divided into 32 subbands.
*/
#ifndef AVCODEC_MPC_H
#define AVCODEC_MPC_H
#include "libavutil/lfg.h"
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "mpegaudio.h"
#include "mpcdata.h"
#define BANDS 32
#define SAMPLES_PER_BAND 36
#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
/** Subband structure - hold all variables for each subband */
typedef struct {
int msf; ///< mid-stereo flag
int res[2];
int scfi[2];
int scf_idx[2][3];
int Q[2];
}Band;
typedef struct {
DSPContext dsp;
GetBitContext gb;
int IS, MSS, gapless;
int lastframelen;
int maxbands, last_max_band;
int last_bits_used;
int oldDSCF[2][BANDS];
Band bands[BANDS];
int Q[2][MPC_FRAME_SIZE];
int cur_frame, frames;
uint8_t *bits;
int buf_size;
AVLFG rnd;
int frames_to_skip;
/* for synthesis */
DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2];
int synth_buf_offset[MPA_MAX_CHANNELS];
DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
} MPCContext;
void ff_mpc_init(void);
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst, int channels);
#endif /* AVCODEC_MPC_H */