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libavcodec
mpc.h
Go to the documentation of this file.
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/*
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* Musepack decoder
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* Copyright (c) 2006 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Musepack decoder
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* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
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* divided into 32 subbands.
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*/
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#ifndef AVCODEC_MPC_H
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#define AVCODEC_MPC_H
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#include "
libavutil/lfg.h
"
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#include "
avcodec.h
"
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#include "
bswapdsp.h
"
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#include "
get_bits.h
"
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#include "
mpegaudio.h
"
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#include "
mpegaudiodsp.h
"
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#define BANDS 32
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#define SAMPLES_PER_BAND 36
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#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
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/** Subband structure - hold all variables for each subband */
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typedef
struct
Band
{
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int
msf
;
///< mid-stereo flag
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int
res
[2];
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int
scfi
[2];
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int
scf_idx
[2][3];
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int
Q
[2];
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}
Band
;
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typedef
struct
MPCContext
{
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BswapDSPContext
bdsp
;
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MPADSPContext
mpadsp
;
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GetBitContext
gb
;
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int
IS
,
MSS
,
gapless
;
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int
lastframelen
;
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int
maxbands
,
last_max_band
;
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int
last_bits_used
;
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int
oldDSCF
[2][
BANDS
];
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Band
bands
[
BANDS
];
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int
Q
[2][
MPC_FRAME_SIZE
];
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int
cur_frame
,
frames
;
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uint8_t
*
bits
;
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int
buf_size
;
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AVLFG
rnd
;
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int
frames_to_skip
;
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/* for synthesis */
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DECLARE_ALIGNED
(16,
MPA_INT
,
synth_buf
)[
MPA_MAX_CHANNELS
][512*2];
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int
synth_buf_offset
[
MPA_MAX_CHANNELS
];
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DECLARE_ALIGNED
(16,
int32_t
,
sb_samples
)[
MPA_MAX_CHANNELS
][36][
SBLIMIT
];
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}
MPCContext
;
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void
ff_mpc_init
(
void
);
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void
ff_mpc_dequantize_and_synth
(
MPCContext
*
c
,
int
maxband, int16_t **
out
,
int
channels);
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#endif
/* AVCODEC_MPC_H */
Generated on Sun Mar 8 2015 02:34:56 for FFmpeg by
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