lxfdec.c File Reference

#include "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	LXFDemuxContext

Macros
#define	LXF_MAX_PACKET_HEADER_SIZE   256
#define	LXF_HEADER_DATA_SIZE   120
#define	LXF_IDENT   "LEITCH\0"
#define	LXF_IDENT_LENGTH   8
#define	LXF_SAMPLERATE   48000
#define	LXF_MAX_AUDIO_PACKET   (8008*15*4)
	15-channel 32-bit NTSC audio frame

Functions
static int	lxf_probe (AVProbeData *p)
static int	check_checksum (const uint8_t *header, int size)
	Verify the checksum of an LXF packet header.
static int	sync (AVFormatContext *s, uint8_t *header)
	Read input until we find the next ident.
static int	get_packet_header (AVFormatContext *s)
	Read and checksum the next packet header.
static int	lxf_read_header (AVFormatContext *s)
static int	lxf_read_packet (AVFormatContext *s, AVPacket *pkt)

Variables
static const AVCodecTag	lxf_tags []
AVInputFormat	ff_lxf_demuxer

Macro Definition Documentation

#define LXF_MAX_PACKET_HEADER_SIZE   256

Definition at line 27 of file lxfdec.c.

Referenced by get_packet_header().

#define LXF_HEADER_DATA_SIZE   120

Definition at line 28 of file lxfdec.c.

Referenced by lxf_read_header().

#define LXF_IDENT   "LEITCH\0"

Definition at line 29 of file lxfdec.c.

Referenced by lxf_probe(), and sync().

#define LXF_IDENT_LENGTH   8

Definition at line 30 of file lxfdec.c.

Referenced by get_packet_header(), lxf_probe(), and sync().

#define LXF_SAMPLERATE   48000

Definition at line 31 of file lxfdec.c.

Referenced by get_packet_header(), and lxf_read_header().

#define LXF_MAX_AUDIO_PACKET   (8008*15*4)

15-channel 32-bit NTSC audio frame

Definition at line 32 of file lxfdec.c.

Referenced by lxf_read_packet().

Function Documentation

static int lxf_probe ( AVProbeData *  p )

static

Definition at line 54 of file lxfdec.c.

static int check_checksum ( const uint8_t *  header, int  size  )

static

Verify the checksum of an LXF packet header.

Parameters

[in]

header

the packet header to check

Returns

zero if the checksum is OK, non-zero otherwise

Definition at line 68 of file lxfdec.c.

Referenced by get_packet_header().

static int sync ( AVFormatContext *  s, uint8_t *  header  )

static

Read input until we find the next ident.

If found, copy it to the header buffer

Parameters

[out]

header

where to copy the ident to

Returns

0 if an ident was found, < 0 on I/O error

Definition at line 85 of file lxfdec.c.

Referenced by avi_sync(), ff_gen_syncpoint_search(), get_packet_header(), ogg_read_page(), and opt_map().

static int get_packet_header ( AVFormatContext *  s )

static

Read and checksum the next packet header.

Returns

the size of the payload following the header or < 0 on failure

Definition at line 111 of file lxfdec.c.

Referenced by lxf_read_header(), and lxf_read_packet().

static int lxf_read_header ( AVFormatContext *  s )

static

Definition at line 226 of file lxfdec.c.

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

static

Definition at line 289 of file lxfdec.c.

Variable Documentation

const AVCodecTag lxf_tags[]

static

Initial value:

= {
    { AV_CODEC_ID_MJPEG,       0 },
    { AV_CODEC_ID_MPEG1VIDEO,  1 },
    { AV_CODEC_ID_MPEG2VIDEO,  2 },    
    { AV_CODEC_ID_MPEG2VIDEO,  3 },    
    { AV_CODEC_ID_DVVIDEO,     4 },    
    { AV_CODEC_ID_DVVIDEO,     5 },    
    { AV_CODEC_ID_DVVIDEO,     6 },    
    { AV_CODEC_ID_RAWVIDEO,    7 },    
    { AV_CODEC_ID_RAWVIDEO,    8 },    
    { AV_CODEC_ID_MPEG2VIDEO,  9 },    
    { AV_CODEC_ID_NONE,        0 },
}

Definition at line 34 of file lxfdec.c.

AVInputFormat ff_lxf_demuxer

Initial value:

= {
    .name           = "lxf",
    .long_name      = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"),
    .priv_data_size = sizeof(LXFDemuxContext),
    .read_probe     = lxf_probe,
    .read_header    = lxf_read_header,
    .read_packet    = lxf_read_packet,
    .codec_tag      = (const AVCodecTag* const []){lxf_tags, 0},
}

Definition at line 340 of file lxfdec.c.