SimpleExoPlayer.getAudioSessionId is Zero after change MediaItem (setMediaItem and prepare())

[farzadno]

Hello. I use exoplayer 2.13.1 in my app. after changes on 2.13.0 (2021-02-04) Audio, SimpleExoPlayer.getAudioSessionId is fix and return true SessionId. But after after change MediaItem, getAudioSessionId return 0.

SimpleExoPlayer simpleExoPlayer = new SimpleExoPlayer.Builder(this).setMediaSourceFactory(new DefaultMediaSourceFactory(cacheDataSourceFactory)).build();
simpleExoPlayer.setWakeMode(PowerManager.PARTIAL_WAKE_LOCK);

simpleExoPlayer.addAnalyticsListener(new AnalyticsListener() {
    @Override
    public void onAudioSessionIdChanged(@NonNull EventTime eventTime, int audioSessionId) {
	    Log.e("FLAG", "sessionId: " + audioSessionId); // not called
    }
});

// on first time prepare: sessionId is true. on second time prepare: sessionId is 0
public void prepare(String audioUrl) {
    MediaItem mediaItem = MediaItem.fromUri(audioUrl);
    simpleExoPlayer.setMediaItem(mediaItem);
    simpleExoPlayer.prepare();
    simpleExoPlayer.setPlayWhenReady(true);
}

[ojw28]

Thanks for reporting this! There is indeed a problem where 0 is incorrectly, and we will fix this in a future release. In the meantime, you can rely on the (true) audio session ID not changing unless application code calls SimpleExoPlayer.setAudioSessionId. Hence you can work around the issue by querying it once immediately after the player has been create.

[ojw28]

This is fixed in dev-v2, and will be included in 2.13.2. Thanks for reporting!