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mpc.h
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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 #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 {
57  int IS, MSS, gapless;
61  int oldDSCF[2][BANDS];
63  int Q[2][MPC_FRAME_SIZE];
66  int buf_size;
69  /* for synthesis */
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 */