SDK / exoplayer

- Increment skippedBufferCount for VPX and ADTR.
- Set maxConsecutiveDroppedOutputBufferCount count for VPX.
  Tweak its meaning to ignore skipped frames.
- Remove outputFormat/outputBuffer changed counts. These add
  limited value. Also, MediaCodec is moving toward a model where
  you don't see the output buffers changing because you dequeue
  them one at a time (like how our extension decoders work).
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Created by MOE: https://github.com/google/moe
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1. AudioDecoderTrackRenderer now reports decoder initialization
   and AudioTrack underruns.
2. AudioDecoderTrackRenderer can now render more than one output
   buffer per call to doSomeWork, to be consistent with
   MediaCodecAudioTrackRenderer. This may also prevent audio
   underruns in the case that audio is fragmented into many small
   buffers.
3. AudioDecoderTrackRenderer now has an overridable method that
   receives the audio session id, to be consistent with
   MediaCodecAudioTrackRenderer.
4. Fix unsafe event notification in LibvpxVideoTrackRenderer.
5. Vpx and AudioDecoder extensions now increment the CodecCounter
   inputBufferCount field correctly.
6. Decoders now have names :).
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The FFmpeg extension can support various different MIME types, so pass the
whole format to configure the decoder.
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Created by MOE: https://github.com/google/moe
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When skipToData is called the peek position is not equal
to the read position of the input. Hence peeking a chunk
header and then skipping by that amount wont do the right
thing :)!
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Issue: #1518
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- Merge guide.md updates from GitHub.
- Update Opus repository.
- Fix missing link in Opus README.
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Issue: #1518
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Mechanical step to create a new HlsSource in the library.
Note that naming is now confusing. This will be fixed in
the next CL, when:

HlsSource -> HlsSampleSource
HlsSampleSource+HlsOutput -> HlsOutput
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http://developer.android.com/reference/android/media/MediaCodec.html#CSD
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Issue: #398
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Support for opus content in ogg container.
TODO: Sample duration and seeking.
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Such files are slightly off spec but easy to support.(https://github.com/google/ExoPlayer/issues/1506)
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=121927762

This is a cleaned up version of the pull request below,
which will be merged with this change then applied on top.

https://github.com/google/ExoPlayer/pull/1490

Issue: #1246
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- This means DrmInitData is propagated through sample queues (i.e.
  is effectively attached to every sample, so we can see when it
  changes when reading from the queue).
- It also allows different DrmInitData per track, which is possible
  in muxed MKV/WebM, and per Representation for DASH, although we
  wont be able to seamlessly adapt in the latter case.
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I've seen a sample that has a LIST chunk prior to fmt. It
seems best just to skip all chunks until the format is
located. As per the RIFF spec:

"Programs must expect (and ignore) any unknown chunks
encountered, as with all RIFF forms."

https://www.aelius.com/njh/wavemetatools/doc/riffmci.pdf
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This allows limiting the horizontal extension of the cues.
NOTE: So far, we only support percentages for size magnitudes.
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SubtitleParser includes a method updating the current
playback position for parsers that need to be aware
of the position in order to determine how to batch
captions (i.e. Eia608Parser).
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- This moves to a single DrmInitData implementation that supports
  both specific and universal UUID matching. You can also do a
  combination of the two, which was not previously possible.
- The object model is simplified as a result. This is a precursor
  to a change where DrmInitData will be included directly in the
  Format to enable key rotation.
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