mp3dec.c File Reference

#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/crc.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "id3v2.h"
#include "id3v1.h"
#include "replaygain.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/mpegaudiodecheader.h"

Go to the source code of this file.

Data Structures
struct	MP3DecContext

Macros
#define	XING_FLAG_FRAMES   0x01
#define	XING_FLAG_SIZE   0x02
#define	XING_FLAG_TOC   0x04
#define	XING_FLAC_QSCALE   0x08
#define	XING_TOC_COUNT   100
#define	SAME_HEADER_MASK   (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
#define	LAST_BITS(k, n)   ((k) & ((1 << (n)) - 1))
#define	MIDDLE_BITS(k, m, n)   LAST_BITS((k) >> (m), ((n) - (m) + 1))
#define	MP3_PACKET_SIZE   1024
#define	SEEK_WINDOW   4096
#define	MIN_VALID   3

Enumerations
enum	CheckRet { CHECK_WRONG_HEADER = -1, CHECK_SEEK_FAILED = -2 }

Functions
static int	check (AVIOContext *pb, int64_t pos, uint32_t *header)
static int	mp3_read_probe (AVProbeData *p)
static void	read_xing_toc (AVFormatContext *s, int64_t filesize, int64_t duration)
static void	mp3_parse_info_tag (AVFormatContext *s, AVStream *st, MPADecodeHeader *c, uint32_t spf)
static void	mp3_parse_vbri_tag (AVFormatContext *s, AVStream *st, int64_t base)
static int	mp3_parse_vbr_tags (AVFormatContext *s, AVStream *st, int64_t base)
	Try to find Xing/Info/VBRI tags and compute duration from info therein. More...
static int	mp3_read_header (AVFormatContext *s)
static int	mp3_read_packet (AVFormatContext *s, AVPacket *pkt)
static int64_t	mp3_sync (AVFormatContext *s, int64_t target_pos, int flags)
static int	mp3_seek (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

Variables
static const AVOption	options []
static const AVClass	demuxer_class
AVInputFormat	ff_mp3_demuxer

Macro Definition Documentation

XING_FLAG_FRAMES

#define XING_FLAG_FRAMES   0x01

Definition at line 38 of file mp3dec.c.

Referenced by mp3_parse_info_tag().

XING_FLAG_SIZE

#define XING_FLAG_SIZE   0x02

Definition at line 39 of file mp3dec.c.

Referenced by mp3_parse_info_tag().

XING_FLAG_TOC

#define XING_FLAG_TOC   0x04

Definition at line 40 of file mp3dec.c.

Referenced by mp3_parse_info_tag().

XING_FLAC_QSCALE

#define XING_FLAC_QSCALE   0x08

Definition at line 41 of file mp3dec.c.

Referenced by mp3_parse_info_tag().

XING_TOC_COUNT

#define XING_TOC_COUNT   100

Definition at line 43 of file mp3dec.c.

Referenced by read_xing_toc().

SAME_HEADER_MASK

#define SAME_HEADER_MASK   (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))

Definition at line 45 of file mp3dec.c.

Referenced by mp3_read_header().

LAST_BITS

#define LAST_BITS	(		k,
			n
	)		((k) & ((1 << (n)) - 1))

MIDDLE_BITS

#define MIDDLE_BITS	(		k,
			m,
			n
	)		LAST_BITS((k) >> (m), ((n) - (m) + 1))

Referenced by mp3_parse_info_tag().

MP3_PACKET_SIZE

#define MP3_PACKET_SIZE   1024

Definition at line 425 of file mp3dec.c.

Referenced by mp3_read_packet().

SEEK_WINDOW

#define SEEK_WINDOW   4096

Definition at line 451 of file mp3dec.c.

Referenced by mp3_sync().

MIN_VALID

#define MIN_VALID   3

Referenced by mp3_sync().

Enumeration Type Documentation

CheckRet

enum CheckRet

Enumerator
CHECK_WRONG_HEADER
CHECK_SEEK_FAILED

Definition at line 60 of file mp3dec.c.

Function Documentation

check()

static int check ( AVIOContext *  pb, int64_t  pos, uint32_t *  header  )

static

Definition at line 453 of file mp3dec.c.

Referenced by mp3_read_header(), and mp3_sync().

mp3_read_probe()

static int mp3_read_probe ( AVProbeData *  p )

static

Definition at line 69 of file mp3dec.c.

read_xing_toc()

static void read_xing_toc ( AVFormatContext *  s, int64_t  filesize, int64_t  duration  )

static

Definition at line 116 of file mp3dec.c.

Referenced by mp3_parse_info_tag().

mp3_parse_info_tag()

static void mp3_parse_info_tag ( AVFormatContext *  s, AVStream *  st, MPADecodeHeader *  c, uint32_t  spf  )

static

Definition at line 141 of file mp3dec.c.

Referenced by mp3_parse_vbr_tags().

mp3_parse_vbri_tag()

static void mp3_parse_vbri_tag ( AVFormatContext *  s, AVStream *  st, int64_t  base  )

static

Definition at line 279 of file mp3dec.c.

Referenced by mp3_parse_vbr_tags().

mp3_parse_vbr_tags()

static int mp3_parse_vbr_tags ( AVFormatContext *  s, AVStream *  st, int64_t  base  )

static

Try to find Xing/Info/VBRI tags and compute duration from info therein.

Definition at line 301 of file mp3dec.c.

Referenced by mp3_read_header().

mp3_read_header()

static int mp3_read_header ( AVFormatContext *  s )

static

Definition at line 344 of file mp3dec.c.

mp3_read_packet()

static int mp3_read_packet ( AVFormatContext *  s, AVPacket *  pkt  )

static

Definition at line 427 of file mp3dec.c.

mp3_sync()

static int64_t mp3_sync ( AVFormatContext *  s, int64_t  target_pos, int  flags  )

static

Definition at line 478 of file mp3dec.c.

Referenced by mp3_seek().

mp3_seek()

static int mp3_seek ( AVFormatContext *  s, int  stream_index, int64_t  timestamp, int  flags  )

static

Definition at line 528 of file mp3dec.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
    { "usetoc", "use table of contents", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM},
    { NULL },
}

Definition at line 580 of file mp3dec.c.

demuxer_class

const AVClass demuxer_class

static

Initial value:

= {
    .class_name = "mp3",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEMUXER,
}

Definition at line 585 of file mp3dec.c.

ff_mp3_demuxer

AVInputFormat ff_mp3_demuxer

Initial value:

= {
    .name           = "mp3",
    .long_name      = NULL_IF_CONFIG_SMALL("MP2/3 (MPEG audio layer 2/3)"),
    .read_probe     = mp3_read_probe,
    .read_header    = mp3_read_header,
    .read_packet    = mp3_read_packet,
    .read_seek      = mp3_seek,
    .priv_data_size = sizeof(MP3DecContext),
    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "mp2,mp3,m2a,mpa", 
    .priv_class     = &demuxer_class,
}

Definition at line 593 of file mp3dec.c.