repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Musepack decoder | |
| 3 | * Copyright (c) 2006 Konstantin Shishkov | |
| 4 | * | |
| 5 | * This file is part of FFmpeg. | |
| 6 | * | |
| 7 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; 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 "bswapdsp.h" | |
| 35 | #include "get_bits.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 */ | |
| 44 | typedef struct Band { | |
| 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 | ||
| 52 | typedef struct MPCContext { | |
| 53 | BswapDSPContext bdsp; | |
| 54 | MPADSPContext mpadsp; | |
| 55 | GetBitContext gb; | |
| 56 | int IS, MSS, gapless; | |
| 57 | int lastframelen; | |
| 58 | int maxbands, last_max_band; | |
| 59 | int last_bits_used; | |
| 60 | int oldDSCF[2][BANDS]; | |
| 61 | Band bands[BANDS]; | |
| 62 | int Q[2][MPC_FRAME_SIZE]; | |
| 63 | int cur_frame, frames; | |
| 64 | uint8_t *bits; | |
| 65 | int buf_size; | |
| 66 | AVLFG rnd; | |
| 67 | int frames_to_skip; | |
| 68 | /* for synthesis */ | |
| 69 | DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2]; | |
| 70 | int synth_buf_offset[MPA_MAX_CHANNELS]; | |
| 71 | DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT]; | |
| 72 | } MPCContext; | |
| 73 | ||
| 74 | void ff_mpc_init(void); | |
| 75 | void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels); | |
| 76 | ||
| 77 | #endif /* AVCODEC_MPC_H */ |