00001 /* 00002 * Musepack decoder 00003 * Copyright (c) 2006 Konstantin Shishkov 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00029 #ifndef AVCODEC_MPC_H 00030 #define AVCODEC_MPC_H 00031 00032 #include "libavutil/lfg.h" 00033 #include "avcodec.h" 00034 #include "get_bits.h" 00035 #include "dsputil.h" 00036 #include "mpegaudio.h" 00037 #include "mpegaudiodsp.h" 00038 00039 #define BANDS 32 00040 #define SAMPLES_PER_BAND 36 00041 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND) 00042 00044 typedef struct { 00045 int msf; 00046 int res[2]; 00047 int scfi[2]; 00048 int scf_idx[2][3]; 00049 int Q[2]; 00050 }Band; 00051 00052 typedef struct { 00053 DSPContext dsp; 00054 MPADSPContext mpadsp; 00055 GetBitContext gb; 00056 int IS, MSS, gapless; 00057 int lastframelen; 00058 int maxbands, last_max_band; 00059 int last_bits_used; 00060 int oldDSCF[2][BANDS]; 00061 Band bands[BANDS]; 00062 int Q[2][MPC_FRAME_SIZE]; 00063 int cur_frame, frames; 00064 uint8_t *bits; 00065 int buf_size; 00066 AVLFG rnd; 00067 int frames_to_skip; 00068 /* for synthesis */ 00069 DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2]; 00070 int synth_buf_offset[MPA_MAX_CHANNELS]; 00071 DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT]; 00072 } MPCContext; 00073 00074 void ff_mpc_init(void); 00075 void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst, int channels); 00076 00077 #endif /* AVCODEC_MPC_H */