GstCodecs.Vp9Decoder¶

Subclasses:: None

Methods¶

Inherited:: GstVideo.VideoDecoder (43), Gst.Element (81), Gst.Object (27), GObject.Object (37)
Structs:: Gst.ElementClass (10), GObject.ObjectClass (5)

set_non_keyframe_format_change_support (support)

Virtual Methods¶

Inherited:: GstVideo.VideoDecoder (21), Gst.Element (16), Gst.Object (1), GObject.Object (7)

	`do_decode_picture` (picture, dpb)
	`do_duplicate_picture` (frame, picture)
	`do_end_picture` (picture)
	`do_get_preferred_output_delay` (is_live)
	`do_new_picture` (frame, picture)
	`do_new_sequence` (frame_hdr, max_dpb_size)
	`do_output_picture` (frame, picture)
	`do_start_picture` (picture)

Properties¶

Inherited:: GstVideo.VideoDecoder (6), Gst.Object (2)

Signals¶

Inherited:: Gst.Element (3), Gst.Object (1), GObject.Object (1)

Fields¶

Inherited:: Gst.Element (3), Gst.Object (1), GObject.Object (1)

Name	Type	Access
input_state	`GstVideo.VideoCodecState`	r
padding	[`object`]	r
parent	`GstVideo.VideoDecoder`	r
parse_compressed_headers	`bool`	r

Class Details¶

class GstCodecs.Vp9Decoder(**kwargs)¶

Bases:: GstVideo.VideoDecoder
Abstract:: Yes
Structure:: GstCodecs.Vp9DecoderClass

The opaque GstCodecs.Vp9Decoder data structure.

set_non_keyframe_format_change_support(support)¶

Parameters:: support (bool) – whether subclass can support non-keyframe format change

Called to set non-keyframe format change awareness

New in version 1.20.

do_decode_picture(picture, dpb) virtual¶

Parameters:

picture (GstCodecs.Vp9Picture) – a GstCodecs.Vp9Picture to decoder
dpb (GstCodecs.Vp9Dpb) – a GstCodecs.Vp9Dpb

Return type:

Gst.FlowReturn

Called to notify decoding for subclass to decoder given picture with given dpb

New in version 1.18.

do_duplicate_picture(frame, picture) virtual¶

Parameters:

frame (GstVideo.VideoCodecFrame) – a GstVideo.VideoCodecFrame
picture (GstCodecs.Vp9Picture) – a GstCodecs.Vp9Picture to be duplicated

Returns:

a GstCodecs.Vp9Picture or None if failed to duplicate picture.

Return type:

GstCodecs.Vp9Picture or None

Optional. Called to duplicate picture when show_existing_frame flag is set in the parsed vp9 frame header. Returned GstCodecs.Vp9Picture from this method should hold already decoded picture data corresponding to the picture, since the returned GstCodecs.Vp9Picture from this method will be passed to the output_picture method immediately without additional decoding process.

If this method is not implemented by subclass, baseclass will drop current GstVideo.VideoCodecFrame without additional processing for the current frame.

New in version 1.18.

do_end_picture(picture) virtual¶

Parameters:: picture (GstCodecs.Vp9Picture) – a GstCodecs.Vp9Picture
Return type:: Gst.FlowReturn

Optional. Called per one GstCodecs.Vp9Picture to notify subclass to finish decoding process for the GstCodecs.Vp9Picture

New in version 1.18.

do_get_preferred_output_delay(is_live) virtual¶

Parameters:: is_live (bool) – whether upstream is live or not
Returns:: the number of perferred delayed output frame
Return type:: int

Optional. Retrieve the preferred output delay from child classes. controls how many frames to delay when calling GstVp9DecoderClass::output_picture

New in version 1.20.

do_new_picture(frame, picture) virtual¶

Parameters:

frame (GstVideo.VideoCodecFrame) – a GstVideo.VideoCodecFrame
picture (GstCodecs.Vp9Picture) – a GstCodecs.Vp9Picture

Return type:

Gst.FlowReturn

Optional. Called whenever new GstCodecs.Vp9Picture is created. Subclass can set implementation specific user data on the GstCodecs.Vp9Picture via GstCodecs.Vp9Picture.set_user_data()

New in version 1.18.

do_new_sequence(frame_hdr, max_dpb_size) virtual¶

Parameters:

frame_hdr (GstCodecs.Vp9FrameHeader) – a GstCodecs.Vp9FrameHeader
max_dpb_size (int) – the size of dpb including preferred output delay by subclass reported via get_preferred_output_delay method.

Return type: