Give all anonymously typedeffed structs in headers a name
[libav.git] / libavcodec / mpc.h
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 */
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 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
75 void ff_mpc_init(void);
76 void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels);
77
78 #endif /* AVCODEC_MPC_H */