RTPHeaderExtension.write

ptrdiff_t write(gst.buffer.Buffer inputMeta,  gstrtp.types.RTPHeaderExtensionFlags writeFlags,  gst.buffer.Buffer output,  ubyte[]  data)

Writes the RTP header extension to data using information available from the input_meta. data will be sized to be at least the value returned from [gstrtp.rtpheader_extension.RTPHeaderExtension.getMaxSize].

Parameters

`inputMeta`	the input #GstBuffer to read information from if necessary
`writeFlags`	#GstRTPHeaderExtensionFlags for how the extension should be written
`output`	output RTP #GstBuffer
`data`	location to write the rtp header extension into

Returns

the size of the data written, < 0 on failure