/* * 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 <stdint.h> #include "libavutil/lfg.h" #include "libavutil/mem_internal.h" #include "bswapdsp.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 Band { int msf; ///< mid-stereo flag int res[2]; int scfi[2]; int scf_idx[2][3]; int Q[2]; }Band; typedef struct MPCContext { BswapDSPContext bdsp; MPADSPContext mpadsp; 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_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels); #endif /* AVCODEC_MPC_H */