gxf.c File Reference

#include <inttypes.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "avformat.h"
#include "internal.h"
#include "gxf.h"
#include "libavcodec/mpeg12data.h"

Go to the source code of this file.

Data Structures
struct	gxf_stream_info

Macros
#define	READ_ONE()

Functions
static int	add_timecode_metadata (AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame)
	parse gxf timecode and add it to metadata
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)
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
static const AVRational	frame_rate_tab []
AVInputFormat	ff_gxf_demuxer

Macro Definition Documentation

#define READ_ONE

(

)

Value:

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

Definition at line 443 of file gxf.c.

Referenced by gxf_resync_media().

Function Documentation

static int add_timecode_metadata ( AVDictionary **  pm, const char *  key, uint32_t  timecode, int  fields_per_frame  )

static

parse gxf timecode and add it to metadata

Definition at line 42 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 67 of file gxf.c.

Referenced by gxf_header(), gxf_packet(), and gxf_resync_media().

static int gxf_probe ( AVProbeData *  p )

static

check if file starts with a PKT_MAP header

Definition at line 89 of file gxf.c.

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 104 of file gxf.c.

Referenced by gxf_header(), and gxf_packet().

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 198 of file gxf.c.

Referenced by gxf_header().

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 236 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 246 of file gxf.c.

Referenced by gxf_header().

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 258 of file gxf.c.

Referenced by gxf_header().

static void gxf_read_index ( AVFormatContext *  s, int  pkt_len  )

static

read index from FLT packet into stream 0 av_index

Definition at line 285 of file gxf.c.

Referenced by gxf_header(), and gxf_packet().

static int gxf_header ( AVFormatContext *  s )

static

Definition at line 316 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 457 of file gxf.c.

Referenced by gxf_read_timestamp(), and gxf_seek().

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

static

Definition at line 495 of file gxf.c.

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

static

Definition at line 562 of file gxf.c.

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

static

Definition at line 588 of file gxf.c.

Variable Documentation

const AVRational frame_rate_tab[]

static

Initial value:

= {
    {   60,    1},
    {60000, 1001},
    {   50,    1},
    {   30,    1},
    {30000, 1001},
    {   25,    1},
    {   24,    1},
    {24000, 1001},
    {    0,    0},
}

Definition at line 219 of file gxf.c.

AVInputFormat ff_gxf_demuxer

Initial value:

= {
    .name           = "gxf",
    .long_name      = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
    .priv_data_size = sizeof(struct gxf_stream_info),
    .read_probe     = gxf_probe,
    .read_header    = gxf_header,
    .read_packet    = gxf_packet,
    .read_seek      = gxf_seek,
    .read_timestamp = gxf_read_timestamp,
}

Definition at line 599 of file gxf.c.