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 00028 #ifndef AVCODEC_MPC_H 00029 #define AVCODEC_MPC_H 00030 00031 #include "libavutil/random.h" 00032 #include "avcodec.h" 00033 #include "bitstream.h" 00034 #include "dsputil.h" 00035 #include "mpegaudio.h" 00036 00037 #include "mpcdata.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 GetBitContext gb; 00055 int IS, MSS, gapless; 00056 int lastframelen; 00057 int maxbands, last_max_band; 00058 int last_bits_used; 00059 int oldDSCF[2][BANDS]; 00060 Band bands[BANDS]; 00061 int Q[2][MPC_FRAME_SIZE]; 00062 int cur_frame, frames; 00063 uint8_t *bits; 00064 int buf_size; 00065 AVRandomState rnd; 00066 int frames_to_skip; 00067 /* for synthesis */ 00068 DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]); 00069 int synth_buf_offset[MPA_MAX_CHANNELS]; 00070 DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]); 00071 } MPCContext; 00072 00073 void ff_mpc_init(void); 00074 void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst); 00075 00076 #endif /* AVCODEC_MPC_H */