GstAudio.AudioDecoderClass

Fields

Name	Type	Access	Description
close	object	r	Optional. Called when the element changes to Gst.State.NULL. Allows closing external resources.
decide_allocation	object	r	Optional. Setup the allocation parameters for allocating output buffers. The passed in query contains the result of the downstream allocation query. Subclasses should chain up to the parent implementation to invoke the default handler.
element_class	Gst.ElementClass	r	The parent class structure
flush	object	r	Optional. Instructs subclass to clear any codec caches and discard any pending samples and not yet returned decoded data. hard indicates whether a FLUSH is being processed, or otherwise a DISCONT (or conceptually similar).
getcaps	object	r	Optional. Allows for a custom sink getcaps implementation. If not implemented, default returns GstAudio.AudioDecoder.proxy_getcaps applied to sink template caps.
handle_frame	object	r	Provides input data (or None to clear any remaining data) to subclass. Input data ref management is performed by base class, subclass should not care or intervene, and input data is only valid until next call to base class, most notably a call to GstAudio.AudioDecoder.finish_frame().
negotiate	object	r	Optional. Negotiate with downstream and configure buffer pools, etc. Subclasses should chain up to the parent implementation to invoke the default handler.
open	object	r	Optional. Called when the element changes to Gst.State.READY. Allows opening external resources.
parse	object	r	Optional. Allows chopping incoming data into manageable units (frames) for subsequent decoding. This division is at subclass discretion and may or may not correspond to 1 (or more) frames as defined by audio format.
pre_push	object	r	Optional. Called just prior to pushing (encoded data) buffer downstream. Subclass has full discretionary access to buffer, and a not OK flow return will abort downstream pushing.
propose_allocation	object	r	Optional. Propose buffer allocation parameters for upstream elements. Subclasses should chain up to the parent implementation to invoke the default handler.
set_format	object	r	Notifies subclass of incoming data format (caps).
sink_event	object	r	Optional. Event handler on the sink pad. Subclasses should chain up to the parent implementation to invoke the default handler.
sink_query	object	r	Optional. Query handler on the sink pad. This function should return True if the query could be performed. Subclasses should chain up to the parent implementation to invoke the default handler.
src_event	object	r	Optional. Event handler on the src pad. Subclasses should chain up to the parent implementation to invoke the default handler.
src_query	object	r	Optional. Query handler on the source pad. This function should return True if the query could be performed. Subclasses should chain up to the parent implementation to invoke the default handler.
start	object	r	Optional. Called when the element starts processing. Allows opening external resources.
stop	object	r	Optional. Called when the element stops processing. Allows closing external resources.
transform_meta	object	r	Optional. Transform the metadata on the input buffer to the output buffer. By default this method copies all meta without tags and meta with only the “audio” tag. subclasses can implement this method and return True if the metadata is to be copied.

Methods

None

Details

class GstAudio.AudioDecoderClass

Subclasses can override any of the available virtual methods or not, as needed. At minimum handle_frame (and likely set_format) needs to be overridden.