libavformat/gxf.c File Reference

#include "libavutil/common.h"
#include "avformat.h"
#include "internal.h"
#include "gxf.h"

Go to the source code of this file.

Data Structures
struct	gxf_stream_info
Defines
#define	READ_ONE()
Functions
static int	parse_packet_header (AVIOContext *pb, GXFPktType *type, int *length)
	parses a packet header, extracting type and length
static int	gxf_probe (AVProbeData *p)
	check if file starts with a PKT_MAP header
static int	get_sindex (AVFormatContext *s, int id, int format)
	gets the stream index for the track with the specified id, creates new stream if not found
static void	gxf_material_tags (AVIOContext *pb, int *len, struct gxf_stream_info *si)
	filters out interesting tags from material information.
static AVRational	fps_tag2avr (int32_t fps)
	convert fps tag value to AVRational fps
static AVRational	fps_umf2avr (uint32_t flags)
	convert UMF attributes flags to AVRational fps
static void	gxf_track_tags (AVIOContext *pb, int *len, struct gxf_stream_info *si)
	filters out interesting tags from track information.
static void	gxf_read_index (AVFormatContext *s, int pkt_len)
	read index from FLT packet into stream 0 av_index
static int	gxf_header (AVFormatContext *s, AVFormatParameters *ap)
static int64_t	gxf_resync_media (AVFormatContext *s, uint64_t max_interval, int track, int timestamp)
	resync the stream on the next media packet with specified properties
static int	gxf_packet (AVFormatContext *s, AVPacket *pkt)
static int	gxf_seek (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
static int64_t	gxf_read_timestamp (AVFormatContext *s, int stream_index, int64_t *pos, int64_t pos_limit)
Variables
AVInputFormat	ff_gxf_demuxer

---

Define Documentation

 

#define READ_ONE

(

)

Value:

{ \
        if (!max_interval-- || url_feof(pb)) \
            goto out; \
        tmp = tmp << 8 | avio_r8(pb); \
    }

Definition at line 369 of file gxf.c.

Referenced by gxf_resync_media().

---

Function Documentation

static AVRational fps_tag2avr

(

int32_t

fps

)

[static]

convert fps tag value to AVRational fps

Parameters:

fps

fps value from tag

Returns:

fps as AVRational, or 0 / 0 if unknown

Definition at line 186 of file gxf.c.

Referenced by gxf_track_tags().

static AVRational fps_umf2avr

(

uint32_t

flags

)

[static]

convert UMF attributes flags to AVRational fps

Parameters:

flags

UMF flags to convert

Returns:

fps as AVRational, or 0 / 0 if unknown

Definition at line 197 of file gxf.c.

Referenced by gxf_header().

static int get_sindex	(	AVFormatContext *	s,
		int	id,
		int	format
	)			[static]

gets the stream index for the track with the specified id, creates new stream if not found

Parameters:

	id	id of stream to find / add
	format	stream format identifier

Definition at line 78 of file gxf.c.

Referenced by gxf_header(), and gxf_packet().

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

Definition at line 261 of file gxf.c.

static void gxf_material_tags	(	AVIOContext *	pb,
		int *	len,
		struct gxf_stream_info *	si
	)			[static]

filters out interesting tags from material information.

Parameters:

	len	length of tag section, will be adjusted to contain remaining bytes
	si	struct to store collected information into

Definition at line 160 of file gxf.c.

Referenced by gxf_header().

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

Definition at line 421 of file gxf.c.

static int gxf_probe

(

AVProbeData *

p

)

[static]

check if file starts with a PKT_MAP header

Definition at line 63 of file gxf.c.

static void gxf_read_index	(	AVFormatContext *	s,
		int	pkt_len
	)			[static]

read index from FLT packet into stream 0 av_index

Definition at line 233 of file gxf.c.

Referenced by gxf_header(), and gxf_packet().

static int64_t gxf_read_timestamp	(	AVFormatContext *	s,
		int	stream_index,
		int64_t *	pos,
		int64_t	pos_limit
	)			[static]

Definition at line 514 of file gxf.c.

static int64_t gxf_resync_media	(	AVFormatContext *	s,
		uint64_t	max_interval,
		int	track,
		int	timestamp
	)			[static]

resync the stream on the next media packet with specified properties

Parameters:

	max_interval	how many bytes to search for matching packet at most
	track	track id the media packet must belong to, -1 for any
	timestamp	minimum timestamp (== field number) the packet must have, -1 for any

Returns:

timestamp of packet found

Definition at line 383 of file gxf.c.

Referenced by gxf_read_timestamp(), and gxf_seek().

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

Definition at line 488 of file gxf.c.

static void gxf_track_tags	(	AVIOContext *	pb,
		int *	len,
		struct gxf_stream_info *	si
	)			[static]

filters out interesting tags from track information.

Parameters:

	len	length of tag section, will be adjusted to contain remaining bytes
	si	struct to store collected information into

Definition at line 209 of file gxf.c.

Referenced by gxf_header().

static int parse_packet_header	(	AVIOContext *	pb,
		GXFPktType *	type,
		int *	length
	)			[static]

parses a packet header, extracting type and length

Parameters:

	pb	AVIOContext to read header from
	type	detected packet type is stored here
	length	detected packet length, excluding header is stored here

Returns:

0 if header not found or contains invalid data, 1 otherwise

Definition at line 41 of file gxf.c.

---

Variable Documentation

AVInputFormat ff_gxf_demuxer

Initial value:

 {
    "gxf",
    NULL_IF_CONFIG_SMALL("GXF format"),
    sizeof(struct gxf_stream_info),
    gxf_probe,
    gxf_header,
    gxf_packet,
    NULL,
    gxf_seek,
    gxf_read_timestamp,
}

Definition at line 525 of file gxf.c.