GstVideoCodecAlphaMeta

This meta is primarily for internal use in GStreamer elements to support VP8/VP9 transparent video stored into WebM or Matroska containers, or transparent static AV1 images. Nothing prevents you from using this meta for custom purposes, but it generally can't be used to easily to add support for alpha channels to CODECs or formats that don't support that out of the box.

GstVideoCodecAlphaMeta

Encapsulate an extra frame containing the encoded alpha channel for the currently negotiated CODEC. The streams must be of the same dimention as the original one.

Members

meta (GstMeta) –

parent GstMeta

buffer (GstBuffer *) –

the encoded alpha frame

Since : 1.20

GstVideo.VideoCodecAlphaMeta

Encapsulate an extra frame containing the encoded alpha channel for the currently negotiated CODEC. The streams must be of the same dimention as the original one.

Members

meta (Gst.Meta) –

parent Gst.Meta

buffer (Gst.Buffer) –

the encoded alpha frame

Since : 1.20

GstVideo.VideoCodecAlphaMeta

Encapsulate an extra frame containing the encoded alpha channel for the currently negotiated CODEC. The streams must be of the same dimention as the original one.

Members

meta (Gst.Meta) –

parent Gst.Meta

buffer (Gst.Buffer) –

the encoded alpha frame

Since : 1.20

Functions

gst_video_codec_alpha_meta_get_info 

const GstMetaInfo *
gst_video_codec_alpha_meta_get_info ()
Returns –

GstMetaInfo pointer that describes GstVideoCodecAlphaMeta.

Since : 1.20

GstVideo.prototype.video_codec_alpha_meta_get_info 

function GstVideo.prototype.video_codec_alpha_meta_get_info(): {
    // javascript wrapper for 'gst_video_codec_alpha_meta_get_info'
}
Returns (Gst.MetaInfo) –

Gst.MetaInfo pointer that describes GstVideo.VideoCodecAlphaMeta.

Since : 1.20

GstVideo.video_codec_alpha_meta_get_info 

def GstVideo.video_codec_alpha_meta_get_info ():
    #python wrapper for 'gst_video_codec_alpha_meta_get_info'
Returns (Gst.MetaInfo) –

Gst.MetaInfo pointer that describes GstVideo.VideoCodecAlphaMeta.

Since : 1.20

Functions

gst_buffer_add_video_codec_alpha_meta 

GstVideoCodecAlphaMeta *
gst_buffer_add_video_codec_alpha_meta (GstBuffer * buffer,
                                       GstBuffer * alpha_buffer)

Attaches a GstVideoCodecAlphaMeta metadata to buffer with the given alpha buffer.

Parameters:

buffer ( [transfer: none]) –

a GstBuffer

alpha_buffer ( [transfer: full]) –

a GstBuffer

Returns ( [transfer: none]) –

the GstVideoCodecAlphaMeta on buffer.

Since : 1.20

GstVideo.prototype.buffer_add_video_codec_alpha_meta 

function GstVideo.prototype.buffer_add_video_codec_alpha_meta(buffer: Gst.Buffer, alpha_buffer: Gst.Buffer): {
    // javascript wrapper for 'gst_buffer_add_video_codec_alpha_meta'
}

Attaches a GstVideo.VideoCodecAlphaMeta metadata to buffer with the given alpha buffer.

Parameters:

buffer (Gst.Buffer) –

a Gst.Buffer

alpha_buffer (Gst.Buffer) –

a Gst.Buffer

the GstVideo.VideoCodecAlphaMeta on buffer.

Since : 1.20

GstVideo.buffer_add_video_codec_alpha_meta 

def GstVideo.buffer_add_video_codec_alpha_meta (buffer, alpha_buffer):
    #python wrapper for 'gst_buffer_add_video_codec_alpha_meta'

Attaches a GstVideo.VideoCodecAlphaMeta metadata to buffer with the given alpha buffer.

Parameters:

buffer (Gst.Buffer) –

a Gst.Buffer

alpha_buffer (Gst.Buffer) –

a Gst.Buffer

the GstVideo.VideoCodecAlphaMeta on buffer.

Since : 1.20

gst_video_codec_alpha_meta_api_get_type 

GType
gst_video_codec_alpha_meta_api_get_type ()
Returns –

GType for the GstVideoCodecAlphaMeta structure.

Since : 1.20

GstVideo.prototype.video_codec_alpha_meta_api_get_type 

function GstVideo.prototype.video_codec_alpha_meta_api_get_type(): {
    // javascript wrapper for 'gst_video_codec_alpha_meta_api_get_type'
}
Returns (GObject.Type) –

GObject.Type for the GstVideo.VideoCodecAlphaMeta structure.

Since : 1.20

GstVideo.video_codec_alpha_meta_api_get_type 

def GstVideo.video_codec_alpha_meta_api_get_type ():
    #python wrapper for 'gst_video_codec_alpha_meta_api_get_type'
Returns (GObject.Type) –

GObject.Type for the GstVideo.VideoCodecAlphaMeta structure.

Since : 1.20

Function Macros

gst_buffer_get_video_codec_alpha_meta 

#define gst_buffer_get_video_codec_alpha_meta(b) \
    ((GstVideoCodecAlphaMeta *)gst_buffer_get_meta((b),GST_VIDEO_CODEC_ALPHA_META_API_TYPE))

Helper macro to get GstVideoCodecAlphaMeta from an existing GstBuffer.

Parameters:

b –

A GstBuffer pointer, must be writable.

Returns ( [nullable]) –

the GstVideoCodecAlphaMeta pointer, or NULL if none.

Since : 1.20

Constants

GST_VIDEO_CODEC_ALPHA_META_API_TYPE 

#define GST_VIDEO_CODEC_ALPHA_META_API_TYPE (gst_video_codec_alpha_meta_api_get_type())

Since : 1.20

GST_VIDEO_CODEC_ALPHA_META_INFO 

#define GST_VIDEO_CODEC_ALPHA_META_INFO  (gst_video_codec_alpha_meta_get_info())

Since : 1.20

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