v4l2src

v4l2src

Properties

gchar * device Read / Write
gchar * device-name Read
GstV4l2DeviceTypeFlags flags Read
guint queue-size Read / Write
gboolean always-copy Read / Write
gint device-fd Read
gint brightness Read / Write
gint contrast Read / Write
gint decimate Read / Write
gint hue Read / Write
gint saturation Read / Write
V4L2_TV_norms norm Read / Write
GstV4l2IOMode io-mode Read / Write
GstStructure * extra-controls Read / Write
gboolean force-aspect-ratio Read / Write
gchar * pixel-aspect-ratio Read / Write

Signals

Types and Values

struct GstV4l2Src

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstBaseSrc
                    ╰── GstPushSrc
                        ╰── GstV4l2Src

Implemented Interfaces

GstV4l2Src implements GstURIHandler, GstTuner, GstColorBalance and GstVideoOrientation.

Description

Synopsis

Element Information

plugin

video4linux2

author

Edgard Lima <edgard.lima@indt.org.br>, Stefan Kost <ensonic@users.sf.net>

class

Source/Video

Element Pads

name

src

direction

source

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, 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){ RGB15, RGB16, BGR, RGB, BGRx, BGRA, xRGB, ARGB, GRAY8, YVU9, YV12, YUY2, UYVY, Y42B, Y41B, NV12_64Z32, YUV9, I420, YVYU, NV21, NV12 }, 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

Functions

Types and Values

struct GstV4l2Src

struct GstV4l2Src;

Property Details

The “device” property

  “device”                   gchar *

Device location.

Flags: Read / Write

Default value: "/dev/video0"


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 “queue-size” property

  “queue-size”               guint

Number of buffers to be enqueud in the driver in streaming mode.

Flags: Read / Write

Allowed values: [1,16]

Default value: 2


The “always-copy” property

  “always-copy”              gboolean

If the buffer will or not be used directly from mmap.

Flags: Read / Write

Default value: TRUE


The “device-fd” property

  “device-fd”                gint

File descriptor of the device.

Flags: Read

Allowed values: >= G_MAXULONG

Default value: -1


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 “decimate” property

  “decimate”                 gint

Only use every nth frame.

Flags: Read / Write

Allowed values: >= 1

Default value: 1


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 “norm” property

  “norm”                     V4L2_TV_norms

video standard.

Flags: Read / Write

Default value: none


The “io-mode” property

  “io-mode”                  GstV4l2IOMode

I/O mode.

Flags: Read / Write

Default value: GST_V4L2_IO_AUTO


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"

Signal Details

The “prepare-format” signal

void
user_function (GstV4l2Src *gstv4l2src,
               gint        arg1,
               GstCaps    *arg2,
               gpointer    user_data)

Flags: Run Last