olly 283bed8cb2 Fix ExoMediaCryptoType attachment
- Attach types for placeholder sessions. If a placeholder session will be
  attached and a downstream renderer doesn't know what to do with it, then
  this attachment is necessary to correctly determine that the renderer
  does not support the track.
- Attach types to sample formats. Without this, if playback fails due to
  a CryptoException, the ExoPlaybackException that gets thrown spuriously
  indicates that the format's DRM type was not supported.

PiperOrigin-RevId: 325214745
2020-08-07 19:02:42 +01:00
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ExoPlayer library

The ExoPlayer library is split into multiple modules. See ExoPlayer's top level README for more information about the available library modules and how to use them.