GstVideoSink
Provides useful functions and a base class for video sinks.
GstVideoSink will configure the default base sink to drop frames that arrive later than 20ms as this is considered the default threshold for observing out-of-sync frames.
GstVideoRectangle
Helper structure representing a rectangular area.
Members
x
(gint)
–
X coordinate of rectangle's top-left point
y
(gint)
–
Y coordinate of rectangle's top-left point
w
(gint)
–
width of the rectangle
h
(gint)
–
height of the rectangle
GstVideoSink
GObject ╰──GInitiallyUnowned ╰──GstObject ╰──GstElement ╰──GstBaseSink ╰──GstVideoSink
The video sink instance structure. Derived video sinks should set the height and width members.
Members
element
(GstBaseSink)
–
width
(gint)
–
video width (derived class needs to set this)
height
(gint)
–
video height (derived class needs to set this)
Class structure
GstVideoSinkClass
The video sink class structure. Derived classes should override the show_frame virtual function.
Fields
parent_class
(GstBaseSinkClass)
–
the parent class structure
GstVideo.VideoSinkClass
The video sink class structure. Derived classes should override the show_frame virtual function.
Attributes
parent_class
(GstBase.BaseSinkClass)
–
the parent class structure
GstVideo.VideoSinkClass
The video sink class structure. Derived classes should override the show_frame virtual function.
Attributes
parent_class
(GstBase.BaseSinkClass)
–
the parent class structure
GstVideo.VideoSink
GObject.Object ╰──GObject.InitiallyUnowned ╰──Gst.Object ╰──Gst.Element ╰──GstBase.BaseSink ╰──GstVideo.VideoSink
The video sink instance structure. Derived video sinks should set the height and width members.
Members
element
(GstBase.BaseSink)
–
width
(Number)
–
video width (derived class needs to set this)
height
(Number)
–
video height (derived class needs to set this)
GstVideo.VideoSink
GObject.Object ╰──GObject.InitiallyUnowned ╰──Gst.Object ╰──Gst.Element ╰──GstBase.BaseSink ╰──GstVideo.VideoSink
The video sink instance structure. Derived video sinks should set the height and width members.
Members
element
(GstBase.BaseSink)
–
width
(int)
–
video width (derived class needs to set this)
height
(int)
–
video height (derived class needs to set this)
Functions
gst_video_sink_center_rect
gst_video_sink_center_rect (GstVideoRectangle src, GstVideoRectangle dst, GstVideoRectangle * result, gboolean scaling)
Takes src rectangle and position it at the center of dst rectangle with or without scaling. It handles clipping if the src rectangle is bigger than the dst one and scaling is set to FALSE.
Parameters:
src
–
the GstVideoRectangle describing the source area
dst
–
the GstVideoRectangle describing the destination area
result
–
a pointer to a GstVideoRectangle which will receive the result area
scaling
–
a gboolean indicating if scaling should be applied or not
GstVideo.VideoSink.prototype.center_rect
function GstVideo.VideoSink.prototype.center_rect(src: GstVideo.VideoRectangle, dst: GstVideo.VideoRectangle, result: GstVideo.VideoRectangle, scaling: Number): {
// javascript wrapper for 'gst_video_sink_center_rect'
}
Takes src rectangle and position it at the center of dst rectangle with or without scaling. It handles clipping if the src rectangle is bigger than the dst one and scaling is set to FALSE.
Parameters:
src
(
GstVideo.VideoRectangle
)
–
the GstVideo.VideoRectangle describing the source area
dst
(
GstVideo.VideoRectangle
)
–
the GstVideo.VideoRectangle describing the destination area
result
(
GstVideo.VideoRectangle
)
–
a pointer to a GstVideo.VideoRectangle which will receive the result area
GstVideo.VideoSink.center_rect
def GstVideo.VideoSink.center_rect (src, dst, result, scaling):
#python wrapper for 'gst_video_sink_center_rect'
Takes src rectangle and position it at the center of dst rectangle with or without scaling. It handles clipping if the src rectangle is bigger than the dst one and scaling is set to FALSE.
Parameters:
src
(
GstVideo.VideoRectangle
)
–
the GstVideo.VideoRectangle describing the source area
dst
(
GstVideo.VideoRectangle
)
–
the GstVideo.VideoRectangle describing the destination area
result
(
GstVideo.VideoRectangle
)
–
a pointer to a GstVideo.VideoRectangle which will receive the result area
Properties
show-preroll-frame
“show-preroll-frame” gboolean
Whether to show video frames during preroll. If set to FALSE, video frames will only be rendered in PLAYING state.
Flags : Read / Write / Construct
Virtual Methods
show_frame
GstFlowReturn show_frame (GstVideoSink * video_sink, GstBuffer * buf)
render a video frame. Maps to render() and preroll() vfuncs. Rendering during preroll will be suppressed if the show-preroll-frame property is set to FALSE.
Parameters:
video_sink
–
buf
–
vfunc_show_frame
function vfunc_show_frame(video_sink: GstVideo.VideoSink, buf: Gst.Buffer): {
// javascript implementation of the 'show_frame' virtual method
}
render a video frame. Maps to render() and preroll() vfuncs. Rendering during preroll will be suppressed if the show-preroll-frame property is set to false.
Parameters:
video_sink
(
GstVideo.VideoSink
)
–
buf
(
Gst.Buffer
)
–
do_show_frame
def do_show_frame (video_sink, buf):
#python implementation of the 'show_frame' virtual method
render a video frame. Maps to render() and preroll() vfuncs. Rendering during preroll will be suppressed if the show_preroll_frame property is set to False.
Parameters:
video_sink
(
GstVideo.VideoSink
)
–
buf
(
Gst.Buffer
)
–
Function Macros
GST_VIDEO_SINK_CAST
#define GST_VIDEO_SINK_CAST(obj) ((GstVideoSink *) (obj))
Cast obj to a GstVideoSink without runtime type check.
Parameters:
obj
–
a GstVideoSink or derived object
GST_VIDEO_SINK_HEIGHT
#define GST_VIDEO_SINK_HEIGHT(obj) (GST_VIDEO_SINK_CAST (obj)->height)
GST_VIDEO_SINK_PAD
#define GST_VIDEO_SINK_PAD(obj) GST_BASE_SINK_PAD(obj)
Get the sink GstPad of obj.
Parameters:
obj
–
GST_VIDEO_SINK_WIDTH
#define GST_VIDEO_SINK_WIDTH(obj) (GST_VIDEO_SINK_CAST (obj)->width)
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