
Releasing the player released the internal playback thread once renderers were released. Releasing a MediaPeriod queued a Loader.ReleaseTask on the loading thread which would post back to the playback thread. If the playback thread had been quit by the time this happened, the release task wouldn't be run. Release on the loading thread instead of the playback thread. This avoids needing to block releasing the player until the loading threads have ended, and ensures that release tasks will run eventually. As part of this change, ExtractorMediaPeriod's call to Extractor.release will now run on the loading thread (which means that all Extractor methods are called on that thread) and other cleanup in ReleaseCallback will run on the loading thread instead of the playback thread. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=185651320