| /* |
| * 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 "libavutil/lfg.h" |
| |
| #include "avcodec.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 */ |