SDK / exoplayer

- Add options to switch abruptly at segment boundaries. Third
  parties who guarantee keyframes at the start of segments will
  want this, because it makes switching more efficient and hence
  rebuffering less likely.
- Switch quality faster when performing a splicing switch (when
  we detect that we need to switch variant, we now immediately
  request the same segment as we did last time for the new variant,
  rather than requesting one more segment for the old variant
  before doing this.

playlist type (master or media).

Issue: #155

dev -> dev-hls

Correctly handle redirection when requesting manifests.

dev -> dev-hls

gradle plugin 0.14.4 fixes

fixes broken import statements

1. Correctly replace the AES data source if IV changes.
2. Check the largest timestamp for being equal to MIN_VALUE, and
   handle this case properly.
3. Clean up AES data source a little.

Issue: #162

The actual fix here is to not call discardExtractors in HlsSampleSource
whilst the loading thread that's pushing data into it is still running.
It's required to wait for that thread to have exited before doing this.

Issue: #159

dev -> dev-hls

Issue: #158

Merge dev -> dev-hls

MediaCodecTrackRenderer: Avoid excessive garbage generation

TsExtractor: Account for frame cropping when parsing SPS

Issue: #153

- Unredact internal error ids.
- Move images.

dev -> dev-hls

Additional IV fix. Trim sign bit from BigInteger.toByteArray() output, if it creates a 17th byte for it. #145

Looking up a long in a HashSet<Long> auto boxes the long and leaves
it for the GC. As decodeOnly is relatively infrequent it's much
better to do a simple linear search in a List<Long>. That way
we can avoid boxing every incoming time stamp value. In the general
case this will be linear searching in an empty list, a very fast
operation.

Signed-off-by: Jonas Larsson <jonas@hallerud.se>

AudioTrack contains the portions of MediaCodecAudioTrackRenderer that handle the
platform AudioTrack instance, including synchronization (playback position
smoothing), non-blocking writes and releasing.

This refactoring should not affect the behavior of audio playback, and is in
preparation for adding an Ac3PassthroughAudioTrackRenderer that will use the
AudioTrack.

Remove implicit back-reference from playback thread to player.

Passing uncropped dimensions to certain decoders will make them
output frames without proper cropping set.

Signed-off-by: Jonas Larsson <jonas@hallerud.se>