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ffmpeg / libavcodec / mpc.h @ 2912e87a

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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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 "get_bits.h"
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#include "dsputil.h"
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#include "mpegaudio.h"
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#include "mpcdata.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 {
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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 {
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    DSPContext dsp;
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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, void *dst, int channels);
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#endif /* AVCODEC_MPC_H */