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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 | |
34 | #include "avcodec.h" |
35 | #include "bswapdsp.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 | int IS, MSS, gapless; |
56 | int lastframelen; |
57 | int maxbands, last_max_band; |
58 | int last_bits_used; |
59 | int oldDSCF[2][BANDS]; |
60 | Band bands[BANDS]; |
61 | int Q[2][MPC_FRAME_SIZE]; |
62 | int cur_frame, frames; |
63 | uint8_t *bits; |
64 | int buf_size; |
65 | AVLFG rnd; |
66 | int frames_to_skip; |
67 | /* for synthesis */ |
68 | DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2]; |
69 | int synth_buf_offset[MPA_MAX_CHANNELS]; |
70 | DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT]; |
71 | } MPCContext; |
72 | |
73 | void ff_mpc_init(void); |
74 | void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels); |
75 | |
76 | #endif /* AVCODEC_MPC_H */ |
77 |