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adaptivedemux: Implement GST_SEEK_TYPE_END usage for live

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When dealing with live streams, we can't rely on GstSegment calculation
since it uses the segment duration to calculate the absolute values.

But since we are dealing with live *and* we know the ranges, we can
compute the absolute seeking values using the range stop (i.e. "now")
as the END position.

Allows seeking back to "live" by using start_type:GST_SEEK_TYPE_END
and start:0

https://bugzilla.gnome.org/show_bug.cgi?id=782228
This commit is contained in:
Edward Hervey 2017-05-05 18:25:43 +02:00 committed by Edward Hervey
parent 0309b20098
commit df60e12203
1 changed files with 22 additions and 0 deletions
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22
gst-libs/gst/adaptivedemux/gstadaptivedemux.c
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@ -1502,6 +1502,7 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
if (gst_adaptive_demux_is_live (demux)) {
gint64 range_start, range_stop;
gboolean changed = FALSE;
if (!gst_adaptive_demux_get_live_seek_range (demux, &range_start,
&range_stop)) {
GST_MANIFEST_UNLOCK (demux);
@ -1510,6 +1511,18 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
return FALSE;
}
/* Handle relative positioning for live streams (relative to the range_stop) */
if (start_type == GST_SEEK_TYPE_END) {
start = range_stop + start;
start_type = GST_SEEK_TYPE_SET;
changed = TRUE;
}
if (stop_type == GST_SEEK_TYPE_END) {
stop = range_stop + stop;
stop_type = GST_SEEK_TYPE_SET;
changed = TRUE;
}
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
@ -1523,6 +1536,7 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
start = range_start;
if (stop != GST_CLOCK_TIME_NONE)
stop += dt;
changed = TRUE;
}
}
@ -1533,6 +1547,14 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
gst_event_unref (event);
return FALSE;
}
if (changed) {
gst_event_unref (event);
event =
gst_event_new_seek (rate, format, flags,
start_type, start, stop_type, stop);
}
}
seqnum = gst_event_get_seqnum (event);