omadec.c File Reference

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

#include <inttypes.h>
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/des.h"
#include "libavutil/mathematics.h"
#include "oma.h"
#include "pcm.h"
#include "id3v2.h"

Go to the source code of this file.

Data Structures
struct	OMAContext

Macros
#define	OMA_RPROBE_M_VAL   48 + 1

Functions
static int	oma_read_close (AVFormatContext *s)
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, unsigned size, const uint8_t *r_val)
static int	nprobe (AVFormatContext *s, uint8_t *enc_header, unsigned size, const uint8_t *n_val)
static int	decrypt_init (AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
static int	read_packet (AVFormatContext *s, AVPacket *pkt)
static int	aal_read_packet (AVFormatContext *s, AVPacket *pkt)
static int	oma_read_header (AVFormatContext *s)
static int	oma_read_packet (AVFormatContext *s, AVPacket *pkt)
static int	oma_read_probe (const 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 []
static const AVChannelLayout	oma_chid_to_native_layout [7]
	map ATRAC-X channel id to internal channel layout
const FFInputFormat	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!).

Supported decoders: ATRAC3, ATRAC3+, MP3, LPCM

Definition in file omadec.c.

Macro Definition Documentation

OMA_RPROBE_M_VAL

#define OMA_RPROBE_M_VAL   48 + 1

Definition at line 142 of file omadec.c.

Referenced by rprobe().

Function Documentation

oma_read_close()

static int oma_read_close ( AVFormatContext * s )

static

Definition at line 95 of file omadec.c.

hex_log()

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

static

Definition at line 102 of file omadec.c.

Referenced by decrypt_init().

kset()

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

static

Definition at line 113 of file omadec.c.

Referenced by decrypt_init(), and nprobe().

rprobe()

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

static

Definition at line 144 of file omadec.c.

Referenced by decrypt_init(), and nprobe().

nprobe()

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

static

Definition at line 180 of file omadec.c.

Referenced by decrypt_init().

decrypt_init()

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

static

Definition at line 229 of file omadec.c.

Referenced by oma_read_header().

read_packet()

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

static

Definition at line 325 of file omadec.c.

aal_read_packet()

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

static

Definition at line 363 of file omadec.c.

Referenced by oma_read_header().

oma_read_header()

static int oma_read_header ( AVFormatContext * s )

static

Definition at line 406 of file omadec.c.

oma_read_packet()

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

static

Definition at line 554 of file omadec.c.

oma_read_probe()

static int oma_read_probe ( const AVProbeData * p )

static

Definition at line 560 of file omadec.c.

oma_read_seek()

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

static

Definition at line 581 of file omadec.c.

Variable Documentation

leaf_table

const uint64_t leaf_table[]

static

Initial value:

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

Definition at line 58 of file omadec.c.

Referenced by decrypt_init().

oma_chid_to_native_layout

const AVChannelLayout oma_chid_to_native_layout[7]

static

Initial value:

= {
    AV_CHANNEL_LAYOUT_MONO,
    AV_CHANNEL_LAYOUT_STEREO,
    AV_CHANNEL_LAYOUT_SURROUND,
    AV_CHANNEL_LAYOUT_4POINT0,
    AV_CHANNEL_LAYOUT_5POINT1_BACK,
    AV_CHANNEL_LAYOUT_6POINT1_BACK,
    AV_CHANNEL_LAYOUT_7POINT1
}

map ATRAC-X channel id to internal channel layout

Definition at line 65 of file omadec.c.

Referenced by oma_read_header().

ff_oma_demuxer

const FFInputFormat ff_oma_demuxer

Initial value:

= {
    .p.name         = "oma",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
    .p.flags        = AVFMT_GENERIC_INDEX,
    .p.extensions   = "oma,omg,aa3",
    .p.codec_tag    = ff_oma_codec_tags_list,
    .priv_data_size = sizeof(OMAContext),
    .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
    .read_probe     = oma_read_probe,
    .read_header    = oma_read_header,
    .read_packet    = oma_read_packet,
    .read_seek      = oma_read_seek,
    .read_close     = oma_read_close,
}

Definition at line 613 of file omadec.c.