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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Musepack decoder |
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| 3 | * Copyright (c) 2006 Konstantin Shishkov |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * Musepack decoder |
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| 25 | * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples |
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| 26 | * divided into 32 subbands. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef AVCODEC_MPC_H |
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| 30 | #define AVCODEC_MPC_H |
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| 31 | |||
| 32 | #include "libavutil/lfg.h" |
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| 33 | #include "avcodec.h" |
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| 34 | #include "get_bits.h" |
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| 35 | #include "dsputil.h" |
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| 36 | #include "mpegaudio.h" |
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| 37 | #include "mpegaudiodsp.h" |
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| 38 | |||
| 39 | #define BANDS 32 |
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| 40 | #define SAMPLES_PER_BAND 36 |
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| 41 | #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND) |
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| 42 | |||
| 43 | /** Subband structure - hold all variables for each subband */ |
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| 44 | typedef struct Band { |
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| 45 | int msf; ///< mid-stereo flag |
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| 46 | int res[2]; |
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| 47 | int scfi[2]; |
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| 48 | int scf_idx[2][3]; |
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| 49 | int Q[2]; |
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| 50 | }Band; |
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| 51 | |||
| 52 | typedef struct MPCContext { |
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| 53 | DSPContext dsp; |
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| 54 | MPADSPContext mpadsp; |
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| 55 | GetBitContext gb; |
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| 56 | int IS, MSS, gapless; |
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| 57 | int lastframelen; |
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| 58 | int maxbands, last_max_band; |
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| 59 | int last_bits_used; |
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| 60 | int oldDSCF[2][BANDS]; |
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| 61 | Band bands[BANDS]; |
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| 62 | int Q[2][MPC_FRAME_SIZE]; |
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| 63 | int cur_frame, frames; |
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| 64 | uint8_t *bits; |
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| 65 | int buf_size; |
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| 66 | AVLFG rnd; |
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| 67 | int frames_to_skip; |
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| 68 | /* for synthesis */ |
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| 69 | DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2]; |
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| 70 | int synth_buf_offset[MPA_MAX_CHANNELS]; |
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| 71 | DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT]; |
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| 72 | } MPCContext; |
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| 73 | |||
| 74 | void ff_mpc_init(void); |
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| 75 | void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels); |
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| 76 | |||
| 77 | #endif /* AVCODEC_MPC_H */ |