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adaptivedemux: allow seeking before start in live streams

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Some derived classes (at least dashdemux) expose a seeking range
based on wall clock. This means that a subsequent seek to the start
of this range will be before the allowed range.

To solve this, seeks without the ACCURATE flag are allowed to seek
before the start for live streams, in which case the segment is
shifted to start at the start of the new seek range. If there is
an end position, is is shifted too, to keep the duration constant.

https://bugzilla.gnome.org/show_bug.cgi?id=753751
This commit is contained in:
Vincent Penquerc'h 2016-03-07 17:04:33 +00:00
parent 87a86b78b5
commit 5b7f60dada
1 changed files with 17 additions and 0 deletions
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17
gst-libs/gst/adaptivedemux/gstadaptivedemux.c
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@ -1341,6 +1341,23 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
gst_event_unref (event);
return FALSE;
}
if (!(flags & GST_SEEK_FLAG_ACCURATE)) {
/* If the accurate flag is not set, we allow seeking before the start
* to map to the start for live cases, since those can return a "moving
* target" based on wall time.
*/
if (start < range_start) {
guint64 dt = range_start - start;
GST_DEBUG_OBJECT (demux,
"Non accurate seek before live stream start, offsetting by %"
GST_TIME_FORMAT, GST_TIME_ARGS (dt));
start = range_start;
if (stop != GST_CLOCK_TIME_NONE)
stop += dt;
}
}
if (start < range_start || start >= range_stop) {
GST_MANIFEST_UNLOCK (demux);
GST_API_UNLOCK (demux);