mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.2 KiB
80 lines
2.2 KiB
/* |
|
* 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 "mpegaudiodsp.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 { |
|
AVFrame frame; |
|
DSPContext dsp; |
|
MPADSPContext mpadsp; |
|
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; |
|
uint8_t *buffer; |
|
int buffer_size; |
|
/* 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 */
|
|
|