v4l2sink

v4l2sink

Properties

gchar * device Read / Write
gint device-fd Read
gchar * device-name Read
GstV4l2DeviceTypeFlags flags Read
guint overlay-height Read / Write
gint overlay-left Read / Write
gint overlay-top Read / Write
guint overlay-width Read / Write
gint brightness Read / Write
gint contrast Read / Write
gint hue Read / Write
gint saturation Read / Write
guint crop-height Read / Write
gint crop-left Read / Write
gint crop-top Read / Write
guint crop-width Read / Write
GstV4l2IOMode io-mode Read / Write
V4L2_TV_norms norm Read / Write
GstStructure * extra-controls Read / Write
gboolean force-aspect-ratio Read / Write
gchar * pixel-aspect-ratio Read / Write

Types and Values

struct GstV4l2Sink

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstBaseSink
                    ╰── GstVideoSink
                        ╰── GstV4l2Sink

Implemented Interfaces

GstV4l2Sink implements GstTuner, GstVideoOverlay, GstNavigation, GstColorBalance and GstVideoOrientation.

Description

v4l2sink can be used to display video to v4l2 devices (screen overlays provided by the graphics hardware, tv-out, etc)

Example launch lines

1
 
gst-launch-1.0 videotestsrc ! v4l2sink device=/dev/video1
This pipeline displays a test pattern on /dev/video1 
1
 
gst-launch-1.0 -v videotestsrc ! navigationtest ! v4l2sink
A pipeline to test navigation events. While moving the mouse pointer over the test signal you will see a black box following the mouse pointer. If you press the mouse button somewhere on the video and release it somewhere else a green box will appear where you pressed the button and a red one where you released it. (The navigationtest element is part of gst-plugins-good.) You can observe here that even if the images are scaled through hardware the pointer coordinates are converted back to the original video frame geometry so that the box can be drawn to the correct position. This also handles borders correctly, limiting coordinates to the image area

Synopsis

Element Information

plugin

 video4linux2

author

 Rob Clark <rob@ti.com>,

class

 Sink/Video

Element Pads

name

 sink

direction

 sink

presence

 always

details

 image/jpeg

video/mpeg, mpegversion=(int)4, systemstream=(boolean)false

video/mpeg, mpegversion=(int)2

video/mpegts, systemstream=(boolean)true

video/x-bayer, format=(string){ bggr, gbrg, grbg, rggb }, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

video/x-dv, systemstream=(boolean)true

video/x-h263, variant=(string)itu

video/x-h264, stream-format=(string){ byte-stream, avc }, alignment=(string)au

video/x-pwc1, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

video/x-pwc2, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

video/x-raw, format=(string){ RGB16, BGR, RGB, GRAY8, GRAY16_LE, GRAY16_BE, YVU9, YV12, YUY2, YVYU, UYVY, Y42B, Y41B, YUV9, NV12_64Z32, NV24, NV61, NV16, NV21, NV12, I420, BGRA, BGRx, ARGB, xRGB, BGR15, RGB15 }, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

video/x-sonix, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

video/x-vp8

video/x-wmv, wmvversion=(int)3, format=(string)WVC1

Functions

Types and Values

struct GstV4l2Sink

struct GstV4l2Sink;

Property Details

The “device” property

  “device”                   gchar *

Device location.

Flags: Read / Write

Default value: "/dev/video1"

The “device-fd” property

  “device-fd”                gint

File descriptor of the device.

Flags: Read

Allowed values: >= G_MAXULONG

Default value: -1

The “device-name” property

  “device-name”              gchar *

Name of the device.

Flags: Read

Default value: NULL

The “flags” property

  “flags”                    GstV4l2DeviceTypeFlags

Device type flags.

Flags: Read

The “overlay-height” property

  “overlay-height”           guint

The height of the video overlay; default is equal to negotiated image height.

Flags: Read / Write

Default value: 0

The “overlay-left” property

  “overlay-left”             gint

The leftmost (x) coordinate of the video overlay; top left corner of screen is 0,0.

Flags: Read / Write

Default value: 0

The “overlay-top” property

  “overlay-top”              gint

The topmost (y) coordinate of the video overlay; top left corner of screen is 0,0.

Flags: Read / Write

Default value: 0

The “overlay-width” property

  “overlay-width”            guint

The width of the video overlay; default is equal to negotiated image width.

Flags: Read / Write

Default value: 0

The “brightness” property

  “brightness”               gint

Picture brightness, or more precisely, the black level.

Flags: Read / Write

Default value: 0

The “contrast” property

  “contrast”                 gint

Picture contrast or luma gain.

Flags: Read / Write

Default value: 0

The “hue” property

  “hue”                      gint

Hue or color balance.

Flags: Read / Write

Default value: 0

The “saturation” property

  “saturation”               gint

Picture color saturation or chroma gain.

Flags: Read / Write

Default value: 0

The “crop-height” property

  “crop-height”              guint

The height of the video crop; default is equal to negotiated image height.

Flags: Read / Write

Default value: 0

The “crop-left” property

  “crop-left”                gint

The leftmost (x) coordinate of the video crop; top left corner of image is 0,0.

Flags: Read / Write

Default value: 0

The “crop-top” property

  “crop-top”                 gint

The topmost (y) coordinate of the video crop; top left corner of image is 0,0.

Flags: Read / Write

Default value: 0

The “crop-width” property

  “crop-width”               guint

The width of the video crop; default is equal to negotiated image width.

Flags: Read / Write

Default value: 0

The “io-mode” property

  “io-mode”                  GstV4l2IOMode

I/O mode.

Flags: Read / Write

Default value: GST_V4L2_IO_AUTO

The “norm” property

  “norm”                     V4L2_TV_norms

video standard.

Flags: Read / Write

Default value: none

The “extra-controls” property

  “extra-controls”           GstStructure *

Extra v4l2 controls (CIDs) for the device.

Flags: Read / Write

The “force-aspect-ratio” property

  “force-aspect-ratio”       gboolean

When enabled, the pixel aspect ratio will be enforced.

Flags: Read / Write

Default value: TRUE

The “pixel-aspect-ratio” property

  “pixel-aspect-ratio”       gchar *

Overwrite the pixel aspect ratio of the device.

Flags: Read / Write

Default value: "1/1"

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