omadec.c File Reference

This is a demuxer for Sony OpenMG Music files. More...

#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/des.h"
#include "oma.h"
#include "pcm.h"
#include "id3v2.h"

Include dependency graph for omadec.c:

Go to the source code of this file.

Data Structures
struct	OMAContext

Typedefs
typedef struct OMAContext	OMAContext

Functions
static void	hex_log (AVFormatContext *s, int level, const char *name, const uint8_t *value, int len)
static int	kset (AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val, int len)
static int	rprobe (AVFormatContext *s, uint8_t *enc_header, const uint8_t *r_val)
static int	nprobe (AVFormatContext *s, uint8_t *enc_header, int size, const uint8_t *n_val)
static int	decrypt_init (AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
static int	oma_read_header (AVFormatContext *s)
static int	oma_read_packet (AVFormatContext *s, AVPacket *pkt)
static int	oma_read_probe (AVProbeData *p)
static int	oma_read_seek (struct AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

Variables
static const uint64_t	leaf_table []
AVInputFormat	ff_oma_demuxer

Detailed Description

This is a demuxer for Sony OpenMG Music files.

Known file extensions: ".oma", "aa3" The format of such files consists of three parts:

• "ea3" header carrying overall info and metadata. Except for starting with "ea" instead of "ID", it's an ID3v2 header.
• "EA3" header is a Sony-specific header containing information about the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA), codec specific info (packet size, sample rate, channels and so on) and DRM related info (file encryption, content id).
• Sound data organized in packets follow the EA3 header (can be encrypted using the Sony DRM!).

Definition in file omadec.c.

Typedef Documentation

typedef struct OMAContext OMAContext

Function Documentation

static int decrypt_init ( AVFormatContext *  s, ID3v2ExtraMeta *  em, uint8_t *  header  )

static

Definition at line 178 of file omadec.c.

Referenced by oma_read_header().

static void hex_log ( AVFormatContext *  s, int  level, const char *  name, const uint8_t *  value, int  len  )

static

Definition at line 76 of file omadec.c.

Referenced by decrypt_init().

static int kset ( AVFormatContext *  s, const uint8_t *  r_val, const uint8_t *  n_val, int  len  )

static

Definition at line 87 of file omadec.c.

Referenced by decrypt_init(), and nprobe().

static int nprobe ( AVFormatContext *  s, uint8_t *  enc_header, int  size, const uint8_t *  n_val  )

static

Definition at line 142 of file omadec.c.

Referenced by decrypt_init().

static int oma_read_header ( AVFormatContext *  s )

static

Definition at line 267 of file omadec.c.

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

static

Definition at line 382 of file omadec.c.

static int oma_read_probe ( AVProbeData *  p )

static

Definition at line 401 of file omadec.c.

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

static

Definition at line 429 of file omadec.c.

static int rprobe ( AVFormatContext *  s, uint8_t *  enc_header, const uint8_t *  r_val  )

static

Definition at line 115 of file omadec.c.

Referenced by decrypt_init(), and nprobe().

Variable Documentation

AVInputFormat ff_oma_demuxer

Initial value:

= {
    .name           = "oma",
    .long_name      = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
    .priv_data_size = sizeof(OMAContext),
    .read_probe     = oma_read_probe,
    .read_header    = oma_read_header,
    .read_packet    = oma_read_packet,
    .read_seek      = oma_read_seek,
    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "oma,omg,aa3",
    .codec_tag      = (const AVCodecTag* const []){ff_oma_codec_tags, 0},
}

Definition at line 451 of file omadec.c.

const uint64_t leaf_table[]

static

Initial value:

= {
    0xd79e8283acea4620, 0x7a9762f445afd0d8,
    0x354d60a60b8c79f1, 0x584e1cde00b07aee,
    0x1573cd93da7df623, 0x47f98d79620dd535
}

Definition at line 52 of file omadec.c.

Referenced by decrypt_init().