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oggdemux: Fix seeking before the first frame.

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The previous code was setting keytarget to target
to make sure the keyframe found for each pad was
indeed before the target.

Then if target == keytarget, it assumed a keyframe had been
found, which was not the case if target was before the first frame
in the file.

This patch checks that a keyframe was indeed found, and if not
seeks to 0, without bisecting again.

Assuming default gst qa assets in $HOME/gst-validate

seek_before_first_frame.scenario:

description, seek=true, handles-states=true
pause, playback-time=0.0
seek, playback-time=0.0, start=0.0, flags=accurate+flush
seek, playback-time=0.0, start=0.01, flags=accurate+flush
seek, playback-time=0.0, start=0.1, flags=accurate+flush

GST_DEBUG=*theoradec*:2 gst-validate-1.0 playbin \
uri=file://$HOME/gst-validate/gst-qa-assets/medias/ogg/vorbis_theora.0.ogg \
--set-scenario seek_before_first_frame.scenario

https://bugzilla.gnome.org/show_bug.cgi?id=741097
This commit is contained in:
Mathieu Duponchelle 2014-11-27 05:53:20 +01:00
parent 6a2f017bfa
commit 4e228e0a1f
1 changed files with 6 additions and 0 deletions
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6
ext/ogg/gstoggdemux.c
View file

@ -2984,6 +2984,7 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
GstFlowReturn ret;
gint i, pending;
gint serialno = 0;
gboolean found_keyframe = FALSE;
position = segment->position;
@ -3114,6 +3115,7 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
if (keyframe_time < keytarget) {
serialno = pad->map.serialno;
keytarget = keyframe_time;
found_keyframe = TRUE;
}
}
@ -3127,6 +3129,10 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
if (segment->rate < 0.0)
goto done;
/* No keyframe found, no need to bisect again, keytarget == target here */
if (!found_keyframe)
best = 0;
if (keytarget != target) {
GST_LOG_OBJECT (ogg, "final seek to target %" GST_TIME_FORMAT,
GST_TIME_ARGS (keytarget));