v4l2.c File Reference

Video4Linux2 grab interface. More...

#include <stdatomic.h>
#include "v4l2-common.h"
#include <dirent.h>

Classes
struct	video_data
struct	buff_data

Macros
#define	V4L_ALLFORMATS   3
#define	V4L_RAWFORMATS   1
#define	V4L_COMPFORMATS   2
#define	V4L_TS_DEFAULT   0
	Return timestamps to the user exactly as returned by the kernel.
#define	V4L_TS_ABS   1
	Autodetect the kind of timestamps returned by the kernel and convert to absolute (wall clock) timestamps.
#define	V4L_TS_MONO2ABS   2
	Assume kernel timestamps are from the monotonic clock and convert to absolute timestamps.
#define	V4L_TS_CONVERT_READY   V4L_TS_DEFAULT
	Once the kind of timestamps returned by the kernel have been detected, the value of the timefilter (NULL or not) determines whether a conversion takes place.
#define	SET_WRAPPERS(prefix)
#define	v4l2_open   s->open_f
#define	v4l2_close   s->close_f
#define	v4l2_dup   s->dup_f
#define	v4l2_ioctl   s->ioctl_f
#define	v4l2_read   s->read_f
#define	v4l2_mmap   s->mmap_f
#define	v4l2_munmap   s->munmap_f
#define	OFFSET(x)   offsetof(struct video_data, x)
#define	DEC   AV_OPT_FLAG_DECODING_PARAM

Variables
AVInputFormat	ff_v4l2_demuxer

Detailed Description

Video4Linux2 grab interface.

Part of this file is based on the V4L2 video capture example (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html)

Thanks to Michael Niedermayer for providing the mapping between V4L2_PIX_FMT_* and AV_PIX_FMT_*

Macro Definition Documentation

SET_WRAPPERS

#define SET_WRAPPERS

(

prefix

)

Value:

do {       \
    s->open_f   = prefix ## open;       \
    s->close_f  = prefix ## close;      \
    s->dup_f    = prefix ## dup;        \
    s->ioctl_f  = prefix ## ioctl;      \
    s->read_f   = prefix ## read;       \
    s->mmap_f   = prefix ## mmap;       \
    s->munmap_f = prefix ## munmap;     \
} while (0)

Variable Documentation

ff_v4l2_demuxer

AVInputFormat ff_v4l2_demuxer

Initial value:

= {
    .name           = "video4linux2,v4l2",
    .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
    .priv_data_size = sizeof(struct video_data),
    .read_probe     = v4l2_read_probe,
    .read_header    = v4l2_read_header,
    .read_packet    = v4l2_read_packet,
    .read_close     = v4l2_read_close,
    .get_device_list = v4l2_get_device_list,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &v4l2_class,
}