Quality selector for ExoPlayer 2

Everything you'd like to achieve is viewable in the ExoPlayer2 demo app. More specifically the PlayerActivity class.

You can also check out this good article on the topic.

The core points you'll want to look into are around track selection (via the TrackSelector) as well as the TrackSelectionHelper. I'll include the important code samples below which will hopefully be enough to get you going. But ultimately just following something similar in the demo app will get you where you need to be.

You'll hold onto the track selector you init the player with and use that for just about everything.

Below is just a block of code to ideally cover the gist of what you're trying to do since the demo does appear to over-complicate things a hair. Also I haven't run the code, but it's close enough.

// These two could be fields OR passed around
int videoRendererIndex;
TrackGroupArray trackGroups;

// This is the body of the logic for see if there are even video tracks
// It also does some field setting
MappedTrackInfo mappedTrackInfo = trackSelector.getCurrentMappedTrackInfo();
for (int i = 0; i < mappedTrackInfo.length; i++) {
  TrackGroupArray trackGroups = mappedTrackInfo.getTrackGroups(i);
  if (trackGroups.length != 0) {
    switch (player.getRendererType(i)) {
      case C.TRACK_TYPE_VIDEO:
        videoRendererIndex = i;
        return true;
    }
  }
}

// This next part is actually about getting the list. It doesn't include
// some additional logic they put in for adaptive tracks (DASH/HLS/SS),
// but you can look at the sample for that (TrackSelectionHelper#buildView())
// Below you'd be building up items in a list. This just does
// views directly, but you could just have a list of track names (with indexes)
for (int groupIndex = 0; groupIndex < trackGroups.length; groupIndex++) {
  TrackGroup group = trackGroups.get(groupIndex);
  for (int trackIndex = 0; trackIndex < group.length; trackIndex++) {
    if (trackIndex == 0) {
      // Beginning of a new set, the demo app adds a divider
    }
    CheckedTextView trackView = ...; // The TextView to show in the list
    // The below points to a util which extracts the quality from the TrackGroup
    trackView.setText(DemoUtil.buildTrackName(group.getFormat(trackIndex)));
}

// Assuming you tagged the view with the groupIndex and trackIndex, you
// can build your override with that info.
Pair<Integer, Integer> tag = (Pair<Integer, Integer>) view.getTag();
int groupIndex = tag.first;
int trackIndex = tag.second;
// This is the override you'd use for something that isn't adaptive.
override = new SelectionOverride(FIXED_FACTORY, groupIndex, trackIndex);
// Otherwise they call their helper for adaptives, which roughly does:
int[] tracks = getTracksAdding(override, trackIndex);
TrackSelection.Factory factory = tracks.length == 1 ? FIXED_FACTORY : adaptiveTrackSelectionFactory;
override = new SelectionOverride(factory, groupIndex, tracks);

// Then we actually set our override on the selector to switch the quality/track
selector.setSelectionOverride(rendererIndex, trackGroups, override);

As I mentioned above, this is a slight oversimplification of the process, but the core part is that you're messing around with the TrackSelector, SelectionOverride, and Track/TrackGroups to get this to work.

You could conceivably copy the demo code verbatim and it should work, but I'd highly recommend taking the time to understand what each piece is doing and tailor your solution to your use case.

If I had more time I'd get it to compile and run. But if you can get my sample going then feel free to edit my post.

Hope that helps :)

I avoid the way as above posted. My way is using the DefaultTrackSelector as follows:

trackSelector.setParameters(trackSelector.getParameters()
                          .withMaxVideoBitrate(bitrate)
                          .withMaxVideoSize(width, height));

I've tested with HLS videos and it seems to perform in the right way. I get the bitrate, width and height reading from the HlsManifest.