Add support for gapless audio playback

[th3hamm0r]

Hi,
I have to implement a music player which plays media sequentially without gaps. I've implemented a prototype that uses multiple (at least two) ExoPlayer instances, which starts the next ExoPlayer instance for the following audio file only milliseconds before the currently playing instance finishes, just to avoid the gap. But of course this is far from perfect!

Is there a cleaner and more reliable solution for this with ExoPlayer?
I think of MediaPlayer's setNextMediaPlayer() (http://developer.android.com/about/versions/android-4.1.html#Gapless).

I want to use the ExoPlayer even for simple audio playback because of its extensibility (caching, streaming bytes from any source,...) and to avoid hacking around with local proxies just to allow playing from custom byte streams for example.

[andrewlewis]

We don't currently have support for gapless playback. I'll use this issue as a tracking bug for the enhancement. Thanks!

[andrewlewis]

We now extract gapless playback metadata, so the remaining work for this is tracked by #1270 (playlist support).

[boywithk9]

Is ogg now gapless also? You only mentioned mp3/mp4.

[andrewlewis]

@boywithk9 It looks like the decoding process for Ogg Vorbis trims padding, so it should work already.

[th3hamm0r]

@boywithk9 @andrewlewis fyi: I'm already using the ExoPlayer for gapless playback of ogg and mp3 files. For mp3 of course, you have to add the correct metadata for gapless playback (something like: ffmpeg -i input.ogg -f wav - | lame -V 2 --noreplaygain - output.mp3)

[boywithk9]

OGG is not gapless with Mediaplyaer.