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dashdemux: Use the current clock running time in addition to the QoS earliest time

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This commit is contained in:
Sebastian Dröge 2017-03-28 14:12:12 +03:00 committed by Edward Hervey
parent 133d1e86bd
commit 6b6c7382c3
1 changed files with 37 additions and 6 deletions
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43
ext/dash/gstdashdemux.c
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@ -1731,13 +1731,47 @@ gst_dash_demux_stream_get_target_time (GstDashDemux * dashdemux,
GstClockTimeDiff diff;
GstClockTime ret = dashstream->actual_position;
GstClockTime deadline;
GstClockTime earliest_time = GST_CLOCK_TIME_NONE;
/* Use current clock time or the QoS earliest time, whichever is further in
* the future. The QoS time is only updated on every QoS event and
* especially not if e.g. a videodecoder or converter drops a frame further
* downstream.
*
* We only use the times if we ever received a QoS event since the last
* flush, as otherwise base_time and clock might not be correct because of a
* still pre-rolling sink
*/
if (stream->qos_earliest_time != GST_CLOCK_TIME_NONE) {
GstClock *clock;
clock = gst_element_get_clock (GST_ELEMENT_CAST (dashdemux));
if (clock) {
GstClockTime base_time;
GstClockTime now_time;
base_time = gst_element_get_base_time (GST_ELEMENT_CAST (dashdemux));
now_time = gst_clock_get_time (clock);
if (now_time > base_time)
now_time -= base_time;
else
now_time = 0;
gst_object_unref (clock);
earliest_time = MAX (now_time, stream->qos_earliest_time);
} else {
earliest_time = stream->qos_earliest_time;
}
}
/* our current position in running time */
cur_running =
gst_segment_to_running_time (&stream->segment, GST_FORMAT_TIME,
dashstream->actual_position);
if (stream->qos_earliest_time == GST_CLOCK_TIME_NONE) {
if (earliest_time == GST_CLOCK_TIME_NONE) {
GstClockTime run_key_dist;
if (dashstream->current_fragment_keyframe_distance != GST_CLOCK_TIME_NONE)
@ -1761,7 +1795,7 @@ gst_dash_demux_stream_get_target_time (GstDashDemux * dashdemux,
/* Figure out the difference, in running time, between where we are and
* where downstream is */
diff = cur_running - stream->qos_earliest_time;
diff = cur_running - earliest_time;
GST_LOG_OBJECT (stream->pad,
"cur_running %" GST_TIME_FORMAT " diff %" GST_STIME_FORMAT
" average_download %" GST_TIME_FORMAT, GST_TIME_ARGS (cur_running),
@ -1775,10 +1809,7 @@ gst_dash_demux_stream_get_target_time (GstDashDemux * dashdemux,
/* Force skipping (but not more than 1s ahead) */
ret =
gst_segment_position_from_running_time (&stream->segment,
GST_FORMAT_TIME, stream->qos_earliest_time + MIN (deadline,
GST_SECOND));
GST_DEBUG_OBJECT (stream->pad, "MUST SKIP to at least %" GST_TIME_FORMAT,
GST_TIME_ARGS (ret));
GST_FORMAT_TIME, earliest_time + MIN (deadline, GST_SECOND));
} else if (diff < 4 * dashstream->average_download_time) {
/* Go forward a bit less aggresively (and at most 1s forward) */
ret = gst_segment_position_from_running_time (&stream->segment,