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Allow regressing media sequence numbers in HLS media playlists

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This is techically not allowed by the spec[1] but might still occur in
certain scenarios. New playlists with older media sequence numbers are
ignored.

[1]: HLS draft version 20, section-6.2.1

Issue:#2059

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=139564889
This commit is contained in:
aquilescanta 2016-11-18 03:30:44 -08:00 committed by Oliver Woodman
parent d890c2f48f
commit cafe603694
1 changed files with 4 additions and 0 deletions
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4
library/src/main/java/com/google/android/exoplayer2/source/hls/playlist/HlsPlaylistTracker.java
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@ -311,6 +311,10 @@ public final class HlsPlaylistTracker implements Loader.Callback<ParsingLoadable
// Playlist has not changed. // Playlist has not changed.
return oldPlaylist; return oldPlaylist;
} }
if (mediaSequenceOffset < 0) {
// Playlist has changed but media sequence has regressed.
return oldPlaylist;
}
if (mediaSequenceOffset <= oldPlaylistSize) { if (mediaSequenceOffset <= oldPlaylistSize) {
// We can extrapolate the start time of new segments from the segments of the old snapshot. // We can extrapolate the start time of new segments from the segments of the old snapshot.
ArrayList<HlsMediaPlaylist.Segment> newSegments = new ArrayList<>(newPlaylistSize); ArrayList<HlsMediaPlaylist.Segment> newSegments = new ArrayList<>(newPlaylistSize);