Swift-Player - Better expo-av HLS player for Android

By using a CustomBandwidthMeter and CustomAdaptiveTrackSelection. Playing an HLS video will start with a fine quality video first then adapt to the network bandwidth.

How to do it

• Run yarn to install the dependencies especially expo-av.
• Run expo eject to build the project as a standalone app.
• Replace files in node_modules/expo-av/android/src/main/java/expo/modules/av/player with the java code in fixs directory using command

cp fixs/* node_modules/expo-av/android/src/main/java/expo/modules/av/player

• Build the app, as usual, using react-native run-android and react-native start.
• Edit the constants in the file CustomBandwidthMeter.java change DEFAULT_INITIAL_BITRATE_ESTIMATE to select the starting bitrate and in file CustomAdaptiveTrackSelection.java change DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS to choose how long to wait before upgrade the video quality.
• Rebuild every time after edit the files using command react-native run-android

Maintaining the source code

• Clone ExoPlayer source code from https://github.com/google/ExoPlayer
• Check the expo-av android ExoPlayer dependency version at node_modules/expo-av/android/android/build.gradle you will the version like this.

api 'com.google.android.exoplayer:exoplayer:2.9.2'

• Check out the ExoPlayer code at those version by search a commit by version number (e.g. 2.9.2).
• Find the files name DefaultAdaptiveTrackSelection.java and DefaultBandwidthMeter.java from ExoPlayer code then merge it to CustomAdaptiveTrackSelection.java and CustomBandwidthMeter.java in fixs respectively.
• Update SimpleExoPlayerData.java only when major api change.