SDK / exoplayer

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Created by MOE: https://github.com/google/moe
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The four-arg constructor didn't exist in ViewGroup for
earlier API levels. I think it can probably be safely
omitted, unless you know otherwise?

Issue: #1820

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Created by MOE: https://github.com/google/moe
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It defaults to 5000, which allows frames to be dropped in an
attempt to seamlessly rejoin when re-enabling video during an
ongoing playback. This causes performance failures when running
the test*AdaptiveWithRendererDisabling playback tests.

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If a Webvtt HlsChunkSource got to schedule its chunk load before the
master HlsChunkSource (the one that downloads the TS or the fMP4
chunks), the player would never get past the buffering state.

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If/when we add the ability to query version information,
such methods will go into FlacLibrary for consistency with
the other extensions. The difference for Flac is that
since the decoder JNI is used by the extractor too, it
needs splitting into a separate from from FlacDecoder.

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Created by MOE: https://github.com/google/moe
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- Also make some of the naming more concise + misc style cleanup.

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Plus misc fixes related to the added samples.

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Created by MOE: https://github.com/google/moe
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- Also fix an issue that allowed blacklisting of all tracks,
due to incorrect index being used.
- Also fix an issue with track deselection for HLS.

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Issue: #631

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This allows the adjustment of timestamps in microseconds along with
TS timestamps. This is useful for containers that include the
timestamps in microseconds format, like fMP4 and WebVTT.

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- This change fixes seeking before the prepare (or more
  accurately, before the timeline is set). The fix a minimal
  one to fix the behavior. It's inefficient compared to
  posting the pending seek onto the playback thread, which
  will be the long term solution.
- As of this change, I think we can call V2 "done". There are
  some loose ends to tie up, but the API is effectively
  finalized and the implementation is in a state where you
  can take it, use it and expect it to work.

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v2/extensions/vp9/src/main/jni/vpx_jni.cc:63:31: warning: missing field 'w' initializer [-Wmissing-field-initializers]
  vpx_codec_dec_cfg_t cfg = {0};
                              ^

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Created by MOE: https://github.com/google/moe
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Adds a few unused fields to HlsUrl and moves things towards the Hls
reimplementation we are looking for. Also fixes a bug related to
asuming every getNextChunk().loadable == null being related to
reaching the live edge.

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