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hlsdemux: Resync live playlists to the 3rd newest fragment if we fall off the playlist

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As HLS does not provide any way of knowing the server's clock, and we do
buffering of "live" streams, at some point we will fall behind the server in
many cases and would have to advance to a fragment that is not in the playlist
anymore.

Previously we would've just resynced to the next oldest fragment that is still
there, but this causes problems as from this point onwards we would always
fall off the playlist again all the time.
Instead we now resync and move to the 3rd newest fragment like we would do
when starting playback of a live stream.

https://bugzilla.gnome.org/show_bug.cgi?id=758987
This commit is contained in:
Sebastian Dröge 2015-12-03 11:46:10 +02:00
parent fe1923e1e6
commit 821320fbc4
1 changed files with 15 additions and 0 deletions
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15
ext/hls/m3u8.c
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@ -1051,6 +1051,21 @@ gst_m3u8_client_advance_fragment (GstM3U8Client * client, gboolean forward)
GST_DEBUG
("Could not find current fragment, trying next fragment directly");
alternate_advance (client, forward);
/* Resync sequence number if the above has failed for live streams */
if (client->current_file == NULL && GST_M3U8_CLIENT_IS_LIVE (client)) {
/* for live streams, start GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE from
the end of the playlist. See section 6.3.3 of HLS draft */
gint pos =
g_list_length (client->current->files) -
GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE;
client->current_file =
g_list_nth (client->current->files, pos >= 0 ? pos : 0);
client->current_file_duration =
GST_M3U8_MEDIA_FILE (client->current_file->data)->duration;
GST_WARNING ("Resyncing live playlist");
}
GST_M3U8_CLIENT_UNLOCK (client);
return;
}