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hlsdemux2: Detect synchronization loss

Browse source 
If we have been updating too slowly and have gone out of the current live
window, inform the baseclass accordingly.

This is different from the case where we have been updating quicker than what
the server provides.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2679>
This commit is contained in:
Edward Hervey 2022-05-23 15:51:23 +02:00 committed by GStreamer Marge Bot
parent 9cdadf6d08
commit 87ab729551
3 changed files with 33 additions and 2 deletions
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8
subprojects/gst-plugins-good/ext/adaptivedemux2/hls/gsthlsdemux.c
View file

@ -2105,6 +2105,11 @@ gst_hls_demux_update_fragment_info (GstAdaptiveDemux2Stream * stream)
gst_hls_media_playlist_get_starting_segment
(hlsdemux_stream->playlist);
} else {
if (gst_hls_media_playlist_has_lost_sync (hlsdemux_stream->playlist,
stream->current_position)) {
GST_WARNING_OBJECT (stream, "Lost SYNC !");
return GST_ADAPTIVE_DEMUX_FLOW_LOST_SYNC;
}
GST_DEBUG_OBJECT (stream,
"Looking up segment for position %" GST_TIME_FORMAT,
GST_TIME_ARGS (stream->current_position));
@ -2113,8 +2118,7 @@ gst_hls_demux_update_fragment_info (GstAdaptiveDemux2Stream * stream)
GST_SEEK_FLAG_SNAP_NEAREST, stream->current_position);
if (hlsdemux_stream->current_segment == NULL) {
GST_INFO_OBJECT (hlsdemux,
"This playlist doesn't contain more fragments");
GST_INFO_OBJECT (stream, "At the end of the current media playlist");
return GST_FLOW_EOS;
}

23
subprojects/gst-plugins-good/ext/adaptivedemux2/hls/m3u8.c
View file

@ -1385,6 +1385,29 @@ out:
return ret;
}
gboolean
gst_hls_media_playlist_has_lost_sync (GstHLSMediaPlaylist * m3u8,
GstClockTime position)
{
GstM3U8MediaSegment *first;
if (m3u8->segments->len < 1)
return TRUE;
first = g_ptr_array_index (m3u8->segments, 0);
GST_DEBUG ("position %" GST_TIME_FORMAT " first %" GST_STIME_FORMAT
" duration %" GST_STIME_FORMAT, GST_TIME_ARGS (position),
GST_STIME_ARGS (first->stream_time), GST_STIME_ARGS (first->duration));
if (first->stream_time <= 0)
return FALSE;
/* If we're definitely before the first fragment, we lost sync */
if ((position + (first->duration / 2)) < first->stream_time)
return TRUE;
return FALSE;
}
gboolean
gst_hls_media_playlist_get_seek_range (GstHLSMediaPlaylist * m3u8,
gint64 * start, gint64 * stop)

4
subprojects/gst-plugins-good/ext/adaptivedemux2/hls/m3u8.h
View file

@ -213,6 +213,10 @@ gst_hls_media_playlist_get_seek_range (GstHLSMediaPlaylist * m3u8,
gint64 * start,
gint64 * stop);
gboolean
gst_hls_media_playlist_has_lost_sync (GstHLSMediaPlaylist * m3u8,
GstClockTime position);
GstM3U8MediaSegment *
gst_hls_media_playlist_seek (GstHLSMediaPlaylist *playlist,
gboolean forward,