SDK / exoplayer

Issue: #227
Issue: #389

1. Reset retry count to 0 if a Loadable makes progress.
2. Handle resume correctly in the case of live streams.

Issue: #227
Issue: #389

Vorbis decoder in android MediaCodec [1] expects the last 4 bytes of the sample to be the number of samples in the current page. This definition holds good only for Ogg and is irrelevant for WebM. So we always set this to -1 (the decoder will ignore this value if we set it to -1). The android platform media extractor [2] does the same.

This works around an issue the audio track continues to play audio data written
after calling AudioTrack.pause(), which breaks rebuffering behavior (as video
can never catch up if audio continues to be consumed, in some circumstances).

Also don't increment the timestamp wrap count if the track is paused, to work
around an issue where the playback head position jumps back to zero after the
AudioTrack position jumps back to zero.

Issue: #231
Issue: #227

ENCODING_PCM_8BIT support is not required.

AudioTrack.getMinBufferSize does not handle ENCODING_DEFAULT so
switch back to ENCODING_PCM_16BIT.

Issue: #339

The OMX component needs to be configured with a format that has a
MIME type of audio/raw. Remove Ac3PassthroughAudioTrackRenderer,
which is no longer used.

This prevents memory leakage even in the case where the app
is still holding a reference (direct or indirect) to the
Allocator.

Issue: #275

Github issue: #375

This package will house all extractors, which will be unified
to implement a single Extractor interface.

The limit on the ts packet buffer can be reduced during processing
if it's discovered to have padding. Hence we need to reset it back
to the ts packet size before processing each packet.

- Atom related stuff in Mp4Util is moved to Atom.
- Remainder of Mp4Util is renamed to H264Util.