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76 lines
2.1 KiB
76 lines
2.1 KiB
/* |
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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 "libavutil/mem_internal.h" |
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#include "avcodec.h" |
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#include "bswapdsp.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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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_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels); |
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#endif /* AVCODEC_MPC_H */
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