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dashdemux2: Fix seeking in a stream with gaps

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When there are gaps between segments in the DASH manifest (e.g. it's a
recording of a live stream during which the camera was turned on and off
a couple times), seeking to a timestamp that belongs into a gap leads to
repeat_index calculation yielding a nonsensical negative number (because
ts < segment->start).

In such event set the playback to continue at the first repetition of
the segment that follows after the gap.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8620>
This commit is contained in:
Jakub Adam 2025-03-10 21:18:55 +01:00 committed by GStreamer Marge Bot
parent 491b72aca3
commit ddd6a708cb
1 changed files with 11 additions and 5 deletions
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16
subprojects/gst-plugins-good/ext/adaptivedemux2/dash/gstmpdclient.c
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@ -1710,10 +1710,16 @@ gst_mpd_client2_stream_seek (GstMPDClient2 * client, GstActiveStream * stream,
GstClockTime chunk_time;
selectedChunk = segment;
repeat_index =
((ts - segment->start) +
((GstMediaSegment *) stream->segments->pdata[0])->start) /
segment->duration;
if (ts < segment->start) {
/* Seek time lies in a gap between segments. Continue playing from
* the first repetition of selectedChunk. */
repeat_index = 0;
} else {
repeat_index =
((ts - segment->start) +
((GstMediaSegment *) stream->segments->pdata[0])->start) /
segment->duration;
}
chunk_time = segment->start + segment->duration * repeat_index;
@ -1738,7 +1744,7 @@ gst_mpd_client2_stream_seek (GstMPDClient2 * client, GstActiveStream * stream,
}
} else if (((forward && flags & GST_SEEK_FLAG_SNAP_AFTER) ||
(!forward && flags & GST_SEEK_FLAG_SNAP_BEFORE)) &&
ts != chunk_time) {
ts > chunk_time) {
if (repeat_index + 1 < segment->repeat) {
repeat_index++;