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videodecoder: Add drain() vfunc

Browse source 
drain() is a new vfunc which does what finish() does, while
explicitly requiring the decoder be able to continue processing
data afterward.

https://bugzilla.gnome.org/show_bug.cgi?id=734617
This commit is contained in:
Jan Schmidt 2015-02-08 05:19:25 +11:00
parent ccee86a7dd
commit af26201429
2 changed files with 24 additions and 6 deletions
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19
gst-libs/gst/video/gstvideodecoder.c
View file

@ -988,6 +988,12 @@ gst_video_decoder_drain_out (GstVideoDecoder * dec, gboolean at_eos)
if (at_eos) {
if (decoder_class->finish)
ret = decoder_class->finish (dec);
} else {
if (decoder_class->drain) {
ret = decoder_class->drain (dec);
} else {
GST_FIXME_OBJECT (dec, "Sub-class should implement drain()");
}
}
} else {
/* Reverse playback mode */
@ -2115,10 +2121,17 @@ gst_video_decoder_flush_parse (GstVideoDecoder * dec, gboolean at_eos)
if (res != GST_FLOW_OK)
goto done;
/* We need to tell the subclass to drain now */
GST_DEBUG_OBJECT (dec, "Finishing");
if (decoder_class->finish)
/* We need to tell the subclass to drain now.
* We prefer the drain vfunc, but for backward-compat
* we use a finish() vfunc if drain isn't implemented */
if (decoder_class->drain) {
GST_DEBUG_OBJECT (dec, "Draining");
res = decoder_class->drain (dec);
} else if (decoder_class->finish) {
GST_FIXME_OBJECT (dec, "Sub-class should implement drain(). "
"Calling finish() for backwards-compat");
res = decoder_class->finish (dec);
}
if (res != GST_FLOW_OK)
goto done;

11
gst-libs/gst/video/gstvideodecoder.h
View file

@ -215,8 +215,12 @@ struct _GstVideoDecoder
* @handle_frame: Provides input data frame to subclass.
* @finish: Optional.
* Called to request subclass to dispatch any pending remaining
* data (e.g. at EOS or segment end). Sub-classes should be prepared
* to handle new data afterward, or seamless segment processing will break.
* data at EOS. Sub-classes can refuse to decode new data after.
* @drain: 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
* @sink_event: Optional.
* Event handler on the sink pad. This function should return
* TRUE if the event was handled and should be discarded
@ -320,9 +324,10 @@ struct _GstVideoDecoderClass
GstCaps* (*getcaps) (GstVideoDecoder *decoder,
GstCaps *filter);
GstFlowReturn (*drain) (GstVideoDecoder *decoder);
/*< private >*/
void *padding[GST_PADDING_LARGE-4];
void *padding[GST_PADDING_LARGE-5];
};
GType gst_video_decoder_get_type (void);