1/* 2 * Musepack decoder 3 * Copyright (c) 2006 Konstantin Shishkov 4 * 5 * This file is part of Libav. 6 * 7 * Libav is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * Libav is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * Musepack decoder 25 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples 26 * divided into 32 subbands. 27 */ 28 29#ifndef AVCODEC_MPC_H 30#define AVCODEC_MPC_H 31 32#include "libavutil/lfg.h" 33#include "avcodec.h" 34#include "get_bits.h" 35#include "dsputil.h" 36#include "mpegaudio.h" 37#include "mpegaudiodsp.h" 38 39#define BANDS 32 40#define SAMPLES_PER_BAND 36 41#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND) 42 43/** Subband structure - hold all variables for each subband */ 44typedef struct { 45 int msf; ///< mid-stereo flag 46 int res[2]; 47 int scfi[2]; 48 int scf_idx[2][3]; 49 int Q[2]; 50}Band; 51 52typedef struct { 53 AVFrame frame; 54 DSPContext dsp; 55 MPADSPContext mpadsp; 56 GetBitContext gb; 57 int IS, MSS, gapless; 58 int lastframelen; 59 int maxbands, last_max_band; 60 int last_bits_used; 61 int oldDSCF[2][BANDS]; 62 Band bands[BANDS]; 63 int Q[2][MPC_FRAME_SIZE]; 64 int cur_frame, frames; 65 uint8_t *bits; 66 int buf_size; 67 AVLFG rnd; 68 int frames_to_skip; 69 /* for synthesis */ 70 DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2]; 71 int synth_buf_offset[MPA_MAX_CHANNELS]; 72 DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT]; 73} MPCContext; 74 75void ff_mpc_init(void); 76void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst, int channels); 77 78#endif /* AVCODEC_MPC_H */ 79