v4l2.c File Reference
#include "config.h"
#include "libavformat/avformat.h"
#include "libavformat/internal.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <poll.h>
#include <linux/videodev2.h>
#include <time.h>
#include "libavutil/imgutils.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avstring.h"
#include "libavutil/mathematics.h"

Go to the source code of this file.

Data Structures

struct  video_data
 
struct  buff_data
 
struct  fmt_map
 

Macros

#define V4L_ALLFORMATS   3
 
#define V4L_RAWFORMATS   1
 
#define V4L_COMPFORMATS   2
 
#define OFFSET(x)   offsetof(struct video_data, x)
 
#define DEC   AV_OPT_FLAG_DECODING_PARAM
 

Functions

static int device_open (AVFormatContext *ctx)
 
static int device_init (AVFormatContext *ctx, int *width, int *height, uint32_t pix_fmt)
 
static int first_field (int fd)
 
static uint32_t fmt_ff2v4l (enum PixelFormat pix_fmt, enum CodecID codec_id)
 
static enum PixelFormat fmt_v4l2ff (uint32_t v4l2_fmt, enum CodecID codec_id)
 
static enum CodecID fmt_v4l2codec (uint32_t v4l2_fmt)
 
static void list_formats (AVFormatContext *ctx, int fd, int type)
 
static int mmap_init (AVFormatContext *ctx)
 
static void mmap_release_buffer (AVPacket *pkt)
 
static int mmap_read_frame (AVFormatContext *ctx, AVPacket *pkt)
 
static int mmap_start (AVFormatContext *ctx)
 
static void mmap_close (struct video_data *s)
 
static int v4l2_set_parameters (AVFormatContext *s1, AVFormatParameters *ap)
 
static uint32_t device_try_init (AVFormatContext *s1, enum PixelFormat pix_fmt, int *width, int *height, enum CodecID *codec_id)
 
static int v4l2_read_header (AVFormatContext *s1, AVFormatParameters *ap)
 
static int v4l2_read_packet (AVFormatContext *s1, AVPacket *pkt)
 
static int v4l2_read_close (AVFormatContext *s1)
 

Variables

static const int desired_video_buffers = 256
 
static struct fmt_map fmt_conversion_table []
 
static const AVOption options []
 
static const AVClass v4l2_class
 
AVInputFormat ff_v4l2_demuxer
 

Macro Definition Documentation

#define DEC   AV_OPT_FLAG_DECODING_PARAM

Definition at line 827 of file v4l2.c.

#define OFFSET (   x)    offsetof(struct video_data, x)

Definition at line 826 of file v4l2.c.

#define V4L_ALLFORMATS   3

Definition at line 56 of file v4l2.c.

#define V4L_COMPFORMATS   2

Definition at line 58 of file v4l2.c.

Referenced by list_formats().

#define V4L_RAWFORMATS   1

Definition at line 57 of file v4l2.c.

Referenced by list_formats().

Function Documentation

static int device_init ( AVFormatContext ctx,
int *  width,
int *  height,
uint32_t  pix_fmt 
)
static

Definition at line 167 of file v4l2.c.

Referenced by device_try_init().

static int device_open ( AVFormatContext ctx)
static

Definition at line 112 of file v4l2.c.

Referenced by v4l2_read_header().

static uint32_t device_try_init ( AVFormatContext s1,
enum PixelFormat  pix_fmt,
int *  width,
int *  height,
enum CodecID codec_id 
)
static

Definition at line 648 of file v4l2.c.

Referenced by v4l2_read_header().

static int first_field ( int  fd)
static

Definition at line 208 of file v4l2.c.

Referenced by dnxhd_decode_frame(), dnxhd_encode_picture(), and v4l2_read_header().

static uint32_t fmt_ff2v4l ( enum PixelFormat  pix_fmt,
enum CodecID  codec_id 
)
static

Definition at line 224 of file v4l2.c.

Referenced by device_try_init().

static enum CodecID fmt_v4l2codec ( uint32_t  v4l2_fmt)
static

Definition at line 254 of file v4l2.c.

Referenced by device_try_init(), and list_formats().

static enum PixelFormat fmt_v4l2ff ( uint32_t  v4l2_fmt,
enum CodecID  codec_id 
)
static

Definition at line 240 of file v4l2.c.

Referenced by list_formats(), and v4l2_read_header().

static void list_formats ( AVFormatContext ctx,
int  fd,
int  type 
)
static

Definition at line 293 of file v4l2.c.

Referenced by v4l2_read_header().

static void mmap_close ( struct video_data s)
static

Definition at line 529 of file v4l2.c.

Referenced by v4l2_read_close().

static int mmap_init ( AVFormatContext ctx)
static

Definition at line 332 of file v4l2.c.

Referenced by v4l2_read_header().

static int mmap_read_frame ( AVFormatContext ctx,
AVPacket pkt 
)
static

Definition at line 433 of file v4l2.c.

Referenced by v4l2_read_packet().

static void mmap_release_buffer ( AVPacket pkt)
static

Definition at line 409 of file v4l2.c.

Referenced by mmap_read_frame().

static int mmap_start ( AVFormatContext ctx)
static

Definition at line 495 of file v4l2.c.

Referenced by v4l2_read_header().

static int v4l2_read_close ( AVFormatContext s1)
static

Definition at line 816 of file v4l2.c.

static int v4l2_read_header ( AVFormatContext s1,
AVFormatParameters ap 
)
static

Definition at line 681 of file v4l2.c.

static int v4l2_read_packet ( AVFormatContext s1,
AVPacket pkt 
)
static

Definition at line 797 of file v4l2.c.

static int v4l2_set_parameters ( AVFormatContext s1,
AVFormatParameters ap 
)
static

Definition at line 546 of file v4l2.c.

Referenced by v4l2_read_header().

Variable Documentation

const int desired_video_buffers = 256
static

Definition at line 54 of file v4l2.c.

Referenced by mmap_init().

AVInputFormat ff_v4l2_demuxer
Initial value:
= {
.name = "video4linux2",
.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
.priv_data_size = sizeof(struct video_data),
.read_packet = v4l2_read_packet,
.read_close = v4l2_read_close,
.flags = AVFMT_NOFILE,
.priv_class = &v4l2_class,
}
static int read_header(FFV1Context *f)
Definition: ffv1.c:1513
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2.c:797
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
static const AVClass v4l2_class
Definition: v4l2.c:842
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:368
static int v4l2_read_close(AVFormatContext *s1)
Definition: v4l2.c:816
static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
Definition: v4l2.c:681

Definition at line 849 of file v4l2.c.

struct fmt_map fmt_conversion_table[]
static
Initial value:
= {
{ PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 },
{ PIX_FMT_YUV422P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
{ PIX_FMT_YUYV422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
{ PIX_FMT_UYVY422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
{ PIX_FMT_YUV411P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
{ PIX_FMT_YUV410P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
{ PIX_FMT_RGB555, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
{ PIX_FMT_RGB565, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
{ PIX_FMT_BGR24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
{ PIX_FMT_RGB24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
{ PIX_FMT_BGRA, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
{ PIX_FMT_GRAY8, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
{ PIX_FMT_NV12, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
{ PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
{ PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
}
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:68
planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (firs...
Definition: pixfmt.h:89
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:71
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:64
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:70
#define PIX_FMT_RGB555
Definition: pixfmt.h:177
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
#define PIX_FMT_RGB565
Definition: pixfmt.h:176
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:65
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:67
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:81
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:66
Y , 8bpp.
Definition: pixfmt.h:72

Definition at line 93 of file v4l2.c.

const AVOption options[]
static
Initial value:
= {
{ "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
{ "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC },
{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC, "list_formats" },
{ "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
{ "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
{ "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
{ NULL },
}
char * pixel_format
Set by a private option.
Definition: v4l2.c:77
int channel
Definition: v4l2.c:74
char * standard
Definition: v4l2.c:73
#define OFFSET(x)
Definition: v4l2.c:826
int list_format
Set by a private option.
Definition: v4l2.c:78
NULL
Definition: eval.c:50
#define V4L_ALLFORMATS
Definition: v4l2.c:56
char * framerate
Set by a private option.
Definition: v4l2.c:79
#define V4L_COMPFORMATS
Definition: v4l2.c:58
#define V4L_RAWFORMATS
Definition: v4l2.c:57
static int64_t video_size
Definition: avconv.c:132
#define DEC
Definition: v4l2.c:827

Definition at line 828 of file v4l2.c.

const AVClass v4l2_class
static
Initial value:
= {
.class_name = "V4L2 indev",
.item_name = av_default_item_name,
.option = options,
}
static const AVOption options[]
Definition: v4l2.c:828
LIBAVUTIL_VERSION_INT
Definition: eval.c:50
av_default_item_name
Definition: dnxhdenc.c:43

Definition at line 842 of file v4l2.c.