libavformat/omadec.c File Reference

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

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

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, const uint8_t *n_val)
static int	decrypt_init (AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
static int	oma_read_header (AVFormatContext *s, AVFormatParameters *ap)
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!).

CODEC SUPPORT: Only ATRAC3 codec is currently supported!

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 176 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 77 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 88 of file omadec.c.

Referenced by decrypt_init(), and nprobe().

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

Definition at line 143 of file omadec.c.

static int oma_read_header	(	AVFormatContext *	s,
		AVFormatParameters *	ap
	)			[static]

Definition at line 259 of file omadec.c.

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

Definition at line 365 of file omadec.c.

static int oma_read_probe

(

AVProbeData *

p

)

[static]

Definition at line 384 of file omadec.c.

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

Definition at line 412 of file omadec.c.

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

Definition at line 116 of file omadec.c.

Referenced by 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 434 of file omadec.c.

const uint64_t leaf_table[] [static]

Initial value:

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

Definition at line 53 of file omadec.c.