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audiodecoder: Where possible, skip decode for GST_SEGMENT_FLAG_TRICKMODE_NO_AUDIO

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If we have timestamps on input buffers and are in trickmode no-audio
mode, then don't pass anything to the subclass for decode and simply
send gap events downstream

Only for forward playback for now - reverse requires accumulating
GAP events and pushing out in reverse order.

https://bugzilla.gnome.org/show_bug.cgi?id=735666
This commit is contained in:
Jan Schmidt 2015-01-28 05:20:19 +11:00
parent ca231ce321
commit 4f961e6d95
1 changed files with 23 additions and 0 deletions
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23
gst-libs/gst/audio/gstaudiodecoder.c
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@ -378,6 +378,8 @@ static gboolean gst_audio_decoder_propose_allocation_default (GstAudioDecoder *
dec, GstQuery * query);
static gboolean gst_audio_decoder_negotiate_default (GstAudioDecoder * dec);
static gboolean gst_audio_decoder_negotiate_unlocked (GstAudioDecoder * dec);
static gboolean gst_audio_decoder_handle_gap (GstAudioDecoder * dec,
GstEvent * event);
static GstElementClass *parent_class = NULL;
@ -1302,6 +1304,27 @@ static GstFlowReturn
gst_audio_decoder_handle_frame (GstAudioDecoder * dec,
GstAudioDecoderClass * klass, GstBuffer * buffer)
{
/* Skip decoding and send a GAP instead if
* GST_SEGMENT_FLAG_TRICKMODE_NO_AUDIO is set and we have timestamps
* FIXME: We only do this for forward playback atm, because reverse
* playback would require accumulating GAP events and pushing them
* out in reverse order as for normal audio samples
*/
if (G_UNLIKELY (dec->input_segment.rate > 0.0
&& dec->input_segment.flags & GST_SEGMENT_FLAG_TRICKMODE_NO_AUDIO)) {
if (buffer) {
GstClockTime ts = GST_BUFFER_PTS (buffer);
if (GST_CLOCK_TIME_IS_VALID (ts)) {
GstEvent *event = gst_event_new_gap (ts, GST_BUFFER_DURATION (buffer));
gst_buffer_unref (buffer);
GST_LOG_OBJECT (dec, "Skipping decode in trickmode and sending gap");
gst_audio_decoder_handle_gap (dec, event);
return GST_FLOW_OK;
}
}
}
if (G_LIKELY (buffer)) {
gsize size = gst_buffer_get_size (buffer);
/* keep around for admin */