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hlsdemux2: Fix position searching

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The scanning is done in a reverse order, the proper full checks to do are
therefore:
* If the position is beyond half a "segment duration", it's in the following
segment
* If the position is within the first half of a segment, it's in that one
* If the segment is the first one and the position is within half a duration
backwards, we consider the position as being within that first segment

Also handle the case where a "partial only" segment doesn't have a reliable
duration, and therefore use the playlist target duration instead.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3883>
This commit is contained in:
Edward Hervey 2023-01-04 11:40:40 +01:00 committed by GStreamer Marge Bot
parent 1c6364673d
commit 5935c8049a
1 changed files with 44 additions and 18 deletions
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62
subprojects/gst-plugins-good/ext/adaptivedemux2/hls/m3u8.c
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@ -1490,16 +1490,17 @@ gst_hls_media_playlist_find_partial_position (GstHLSMediaPlaylist * playlist,
return FALSE;
}
/* gst_hls_media_playlist_find_position() is used
* when finding the segment or partial segment that corresponds
* to our current playback position.
/* gst_hls_media_playlist_find_position() is used when finding the segment or
* partial segment that corresponds to our current playback position.
*
* If we're "playing partial segments", we want to find the partial segment
whose stream_time matches the target position most closely (or fail
if there's no partial segment, since the target partial segment was
removed from the playlist and we lost sync.
* If not currently playing partial segment, find the segment with a
* stream_time that matches, or the partial segment exactly at the start
* of the 'partial_only' segment.
* whose stream_time matches the target position most closely (or fail if
* there's no partial segment, since the target partial segment was removed from
* the playlist and we lost sync.
*
* If not currently playing partial segment, find the segment with a stream_time
* that matches, or the partial segment exactly at the start of the
* 'partial_only' segment.
*/
gboolean
gst_hls_media_playlist_find_position (GstHLSMediaPlaylist * playlist,
@ -1507,7 +1508,7 @@ gst_hls_media_playlist_find_position (GstHLSMediaPlaylist * playlist,
GstM3U8SeekResult * seek_result)
{
guint i;
GstM3U8MediaSegment *seg = NULL;
GstM3U8MediaSegment *seg = NULL, *following = NULL;
GST_DEBUG ("ts:%" GST_STIME_FORMAT
" in_partial_segments %d (live %d) playlist uri: %s", GST_STIME_ARGS (ts),
@ -1579,19 +1580,44 @@ gst_hls_media_playlist_find_position (GstHLSMediaPlaylist * playlist,
}
}
/* Otherwise, we're doing a full segment match so check that the timestamp is
* within half a segment duration of this segment stream_time. The maximum
* of the current segment or target duration is used, because the partial-only
* last segment might be quite small (as it's still being created), which
* can cause a missed match otherwise */
/* Otherwise, we're doing a full segment match so check that the timestamp
* is within half a segment duration of this segment stream_time.
*
* If the final segment has partial fragments, the target duration is used
* instead, because the partial-only last segment might be quite small (as
* it's still being created), which can cause a missed match otherwise */
GstClockTimeDiff match_threshold =
MAX (cand->duration, playlist->targetduration) / 2;
if (cand->stream_time + match_threshold >= ts
&& cand->stream_time <= ts + match_threshold) {
(cand->partial_only ? playlist->targetduration : cand->duration) / 2;
/* If the requesting position is beyond the halfway point of this segment,
* we should return the following segment, which is closer to the requested
* position. Note that it can be NULL */
if (ts > cand->stream_time + match_threshold) {
if (following)
GST_DEBUG ("choosing following segment %d", seg_idx + 1);
else
GST_DEBUG ("After last segment");
seg = following;
break;
}
/* Else if the requested position is within the first half we are sure it's
* this segment */
if (ts >= cand->stream_time) {
GST_DEBUG ("choosing segment %d", seg_idx);
seg = cand;
break;
}
/* Last check for the very first segment in the playlist */
if (i == 1 && cand->stream_time <= ts + match_threshold) {
GST_DEBUG ("choosing first segment");
seg = cand;
break;
}
/* We are scanning backwards, remember this as the following segment */
following = cand;
}
if (seg == NULL) {