FFmpeg
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 "libavutil/mem_internal.h"
34 
35 #include "avcodec.h"
36 #include "bswapdsp.h"
37 #include "mpegaudio.h"
38 #include "mpegaudiodsp.h"
39 
40 #define BANDS 32
41 #define SAMPLES_PER_BAND 36
42 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
43 
44 /** Subband structure - hold all variables for each subband */
45 typedef struct Band {
46  int msf; ///< mid-stereo flag
47  int res[2];
48  int scfi[2];
49  int scf_idx[2][3];
50  int Q[2];
51 }Band;
52 
53 typedef struct MPCContext {
56  int IS, MSS, gapless;
60  int oldDSCF[2][BANDS];
62  int Q[2][MPC_FRAME_SIZE];
64  uint8_t *bits;
65  int buf_size;
68  /* for synthesis */
72 } MPCContext;
73 
74 void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels);
75 
76 #endif /* AVCODEC_MPC_H */
bswapdsp.h
mem_internal.h
out
FILE * out
Definition: movenc.c:54
MPCContext::frames_to_skip
int frames_to_skip
Definition: mpc.h:67
MPCContext::last_max_band
int last_max_band
Definition: mpc.h:58
Band::msf
int msf
mid-stereo flag
Definition: mpc.h:46
MPADSPContext
Definition: mpegaudiodsp.h:27
MPCContext::lastframelen
int lastframelen
Definition: mpc.h:57
MPCContext::sb_samples
int32_t sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]
Definition: mpc.h:71
MPCContext
Definition: mpc.h:53
MPCContext::gapless
int gapless
Definition: mpc.h:56
Band::res
int res[2]
Definition: mpc.h:47
MPCContext::mpadsp
MPADSPContext mpadsp
Definition: mpc.h:55
MPCContext::rnd
AVLFG rnd
Definition: mpc.h:66
MPCContext::last_bits_used
int last_bits_used
Definition: mpc.h:59
MPCContext::synth_buf
MPA_INT synth_buf[MPA_MAX_CHANNELS][512 *2]
Definition: mpc.h:69
MPCContext::buf_size
int buf_size
Definition: mpc.h:65
MPCContext::cur_frame
int cur_frame
Definition: mpc.h:63
MPCContext::maxbands
int maxbands
Definition: mpc.h:58
Band::scf_idx
int scf_idx[2][3]
Definition: mpc.h:49
lfg.h
MPCContext::bits
uint8_t * bits
Definition: mpc.h:64
channels
channels
Definition: aptx.h:33
ff_mpc_dequantize_and_synth
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels)
Definition: mpc.c:56
MPCContext::IS
int IS
Definition: mpc.h:56
MPC_FRAME_SIZE
#define MPC_FRAME_SIZE
Definition: mpc.h:42
Band::scfi
int scfi[2]
Definition: mpc.h:48
SBLIMIT
#define SBLIMIT
Definition: mpegaudio.h:44
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
BANDS
#define BANDS
Definition: mpc.h:40
AVLFG
Context structure for the Lagged Fibonacci PRNG.
Definition: lfg.h:33
MPCContext::oldDSCF
int oldDSCF[2][BANDS]
Definition: mpc.h:60
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:117
MPCContext::bands
Band bands[BANDS]
Definition: mpc.h:61
MPCContext::bdsp
BswapDSPContext bdsp
Definition: mpc.h:54
MPCContext::MSS
int MSS
Definition: mpc.h:56
mpegaudio.h
avcodec.h
MPCContext::synth_buf_offset
int synth_buf_offset[MPA_MAX_CHANNELS]
Definition: mpc.h:70
Band
Subband structure - hold all variables for each subband.
Definition: mpc.h:45
mpegaudiodsp.h
MPA_INT
int32_t MPA_INT
Definition: mpegaudio.h:75
Band::Q
int Q[2]
Definition: mpc.h:50
int32_t
int32_t
Definition: audioconvert.c:56
MPA_MAX_CHANNELS
#define MPA_MAX_CHANNELS
Definition: mpegaudio.h:42
BswapDSPContext
Definition: bswapdsp.h:24
MPCContext::frames
int frames
Definition: mpc.h:63
MPCContext::Q
int Q[2][MPC_FRAME_SIZE]
Definition: mpc.h:62