SDK / exoplayer

This may be painful in terms of applications having to change their
imports. Sorry about that.

Merge dev-hls -> dev

dev -> dev-hls

Also added clamping to getSegmentNum in one case where
it was not already implemented, and defined this behavior
property in the getSegmentNum javadoc.

Issue: #262

This makes the calculation correct for the case where periodDurationMs
does not divide exactly into durationMs.

Fixed wrong calculation of last segment number when using segment templa...

Fixed wrong calculation of last segment number when using segment template without segment timeline.

dev -> dev-hls

Without this, the byte is cast as follows (in bits) if the top
byte is set:

10000010 -> 1000000000000000000000000000010

This works because we then always shift at least one bit left,
and only look at the bottom 8 bits of the result. It's confusing
though. It's clearer if the cast to int gives just adds zeros to
the front, like:

10000010 -> 0000000000000000000000010000010

Fix a signed right shift issue in BitArray.readUnsignedByte()

Make BitArray.readUnsignedByte() a bit more clear by using int value instead of byte to prevent unnecessary convert from int to byte.

Fix an issue in BitArray.readUnsignedByte() returns incorrect value when bitOffset is not zero and data[byteOffset + 1] starts with bit 1.
This is caused by signed right shift, the fix is simply to make it unsigned right shift.

dev -> dev-hls

FrameworkSampleSource with FileDescriptor

Move Closed Captions processing to Eia608TrackRenderer. Use TextRenderer interface for captions. Sort captions based on video frames DTS. Add better control characters and special characters in basic North American character set support. Fixes #156

dev -> dev-hls

Issue: #217
Issue: #228

Empirical testing in shows increased robustness.

- Workaround issue where video may freeze whilst audio continues
  on some devices that have entered bad states.
- Fix wrap-around for playbacks lasting more than 27 hours.

Apparently some servers don't like it, and in general it's
unnecessary to set the header for this case.

Refine logic for determining AudioTrack size.

- Target 4x the minimum specified by the framework.
- Impose a minimum duration (250ms).
- Impose a maximum duration (750ms, or the minimum
  specified by the framework if that's larger).

I've removed the ability to specify the multiplication
factor, since the underlying implementation is getting more
complicated, and we should really be able to figure this out
internally.