FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mpc.h
Go to the documentation of this file.
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 "bswapdsp.h"
35 #include "get_bits.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 {
56  int IS, MSS, gapless;
60  int oldDSCF[2][BANDS];
62  int Q[2][MPC_FRAME_SIZE];
65  int buf_size;
68  /* for synthesis */
72 } MPCContext;
73 
74 void ff_mpc_init(void);
75 void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels);
76 
77 #endif /* AVCODEC_MPC_H */
Definition: lfg.h:25
int32_t sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]
Definition: mpc.h:71
int Q[2]
Definition: mpc.h:49
#define SBLIMIT
Definition: mpegaudio.h:43
MPADSPContext mpadsp
Definition: mpc.h:54
MPA_INT synth_buf[MPA_MAX_CHANNELS][512 *2]
Definition: mpc.h:69
int msf
mid-stereo flag
Definition: mpc.h:45
int Q[2][MPC_FRAME_SIZE]
Definition: mpc.h:62
int res[2]
Definition: mpc.h:46
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:53
AVLFG rnd
Definition: mpc.h:66
int last_max_band
Definition: mpc.h:58
int buf_size
Definition: mpc.h:65
int32_t MPA_INT
Definition: mpegaudio.h:71
int lastframelen
Definition: mpc.h:57
int gapless
Definition: mpc.h:56
uint8_t
int scf_idx[2][3]
Definition: mpc.h:48
bitstream reader API header.
void ff_mpc_init(void)
Definition: mpc.c:38
int last_bits_used
Definition: mpc.h:59
int IS
Definition: mpc.h:56
int cur_frame
Definition: mpc.h:63
int maxbands
Definition: mpc.h:58
Libavcodec external API header.
#define MPA_MAX_CHANNELS
Definition: mpegaudio.h:41
uint8_t * bits
Definition: mpc.h:64
#define MPC_FRAME_SIZE
Definition: mpc.h:41
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels)
Definition: mpc.c:62
#define BANDS
Definition: mpc.h:39
int32_t
BswapDSPContext bdsp
Definition: mpc.h:53
int scfi[2]
Definition: mpc.h:47
int oldDSCF[2][BANDS]
Definition: mpc.h:60
Band bands[BANDS]
Definition: mpc.h:61
static double c[64]
mpeg audio declarations for both encoder and decoder.
int MSS
Definition: mpc.h:56
int frames
Definition: mpc.h:63
int synth_buf_offset[MPA_MAX_CHANNELS]
Definition: mpc.h:70
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
GetBitContext gb
Definition: mpc.h:55
Subband structure - hold all variables for each subband.
Definition: mpc.h:44
Definition: mpc.h:52
int frames_to_skip
Definition: mpc.h:67