Optional. Called when the element changes to GST_STATE_NULL. Allows closing external resources.
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.
Optional. Called to request subclass to decode any data it can at this point, but that more data may arrive after. (e.g. at segment end). Sub-classes should be prepared to handle new data afterward, or seamless segment processing will break. Since: 1.6
Optional. Called to request subclass to dispatch any pending remaining data at EOS. Sub-classes can refuse to decode new data after.
Optional. Flush all remaining data from the decoder without pushing it downstream. Since: 1.2
Optional. Allows for a custom sink getcaps implementation. If not implemented, default returns gst_video_decoder_proxy_getcaps applied to sink template caps.
Provides input data frame to subclass. In subframe mode, the subclass needs to take ownership of @GstVideoCodecFrame.input_buffer as it will be modified by the base class on the next subframe buffer receiving.
Optional. Negotiate with downstream and configure buffer pools, etc. Subclasses should chain up to the parent implementation to invoke the default handler.
Optional. Called when the element changes to GST_STATE_READY. Allows opening external resources.
Required for non-packetized input. Allows chopping incoming data into manageable units (frames) for subsequent decoding.
Optional. Propose buffer allocation parameters for upstream elements. Subclasses should chain up to the parent implementation to invoke the default handler.
Optional. Allows subclass (decoder) to perform post-seek semantics reset. Deprecated.
Notifies subclass of incoming data format (caps).
Optional. Event handler on the sink pad. This function should return TRUE if the event was handled and should be discarded (i.e. not unref'ed). Subclasses should chain up to the parent implementation to invoke the default handler.
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. Since: 1.4
Optional. Event handler on the source pad. This function should return TRUE if the event was handled and should be discarded (i.e. not unref'ed). Subclasses should chain up to the parent implementation to invoke the default handler.
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. Since: 1.4
Optional. Called when the element starts processing. Allows opening external resources.
Optional. Called when the element stops processing. Allows closing external resources.
Optional. Transform the metadata on the input buffer to the output buffer. By default this method is copies all meta without tags and meta with only the "video" tag. subclasses can implement this method and return true if the metadata is to be copied. Since: 1.6
Subclasses can override any of the available virtual methods or not, as needed. At minimum @handle_frame needs to be overridden, and @set_format and likely as well. If non-packetized input is supported or expected, @parse needs to be overridden as well.