Exo Player 2.1.1 stuck in buffering state after enabling webVTT closed captions

[andrei1990]

When trying to enable closed captions for Apple master playlist advanced or other HLS test streams the video is buffering and sometimes it stuck in this state. In order to make the video play again you should go and disable captions and enable them again and video resumes then.

Version used: 2.1.1
Devices: Samsung Galaxy S3 , OS 4.3, Nexus 5, OS 6.0

Also this is happening with ours hls streams that has vtt embeded captions.

@Override
    public void setCaptionsState(boolean disabled) {
        if (closedCaptionsRendererIndex != -1) {
            trackSelector.setRendererDisabled(closedCaptionsRendererIndex, disabled);
            if (!disabled) {
                enableCaptions();
            } else {
                trackSelector.clearSelectionOverrides(closedCaptionsRendererIndex);
            }
        }


    }


    private void enableCaptions() {
        TrackGroupArray trackGroups = trackSelector.getCurrentMappedTrackInfo().getTrackGroups(closedCaptionsRendererIndex);
        if (selectionOverride != null) {
            setSelectionOverride(closedCaptionsRendererIndex, trackGroups, selectionOverride);
            return;
        }
        for (int groupIndex = 0; groupIndex < trackGroups.length; groupIndex++) {
            TrackGroup group = trackGroups.get(groupIndex);
            for (int trackIndex = 0; trackIndex < group.length; trackIndex++) {
                if (foundPreferredClosedCaptionsTrackIndex(MimeTypes.BASE_TYPE_TEXT, groupIndex, trackIndex, trackGroups, group))
                    return;
            }
        }
        for (int groupIndex = 0; groupIndex < trackGroups.length; groupIndex++) {
            TrackGroup group = trackGroups.get(groupIndex);
            for (int trackIndex = 0; trackIndex < group.length; trackIndex++) {
                if (foundPreferredClosedCaptionsTrackIndex(MimeTypes.BASE_TYPE_APPLICATION, groupIndex, trackIndex, trackGroups, group))
                    return;
            }
        }
    }

    private boolean foundPreferredClosedCaptionsTrackIndex(String mimeType, int groupIndex, int trackIndex, TrackGroupArray trackGroups, TrackGroup group) {
        Format format = group.getFormat(trackIndex);
        String formatMimeType = format.sampleMimeType;
        if (!(TextUtils.isEmpty(formatMimeType)) && formatMimeType.startsWith(mimeType)) {
            selectionOverride = new MappingTrackSelector.SelectionOverride(FIXED_FACTORY, groupIndex, trackIndex);
            setSelectionOverride(closedCaptionsRendererIndex, trackGroups, selectionOverride);
            return true;
        }
        return false;
    }

    private void setSelectionOverride(int rendererIndex, TrackGroupArray trackGroupArray, MappingTrackSelector.SelectionOverride selectionOverride) {
        trackSelector.setSelectionOverride(rendererIndex, trackGroupArray, selectionOverride);
    }

[AquilesCanta]

A fix for this will be available in the next push.