1.3.0-beta01

This release includes the following changes since the 1.3.0-alpha01 release:

• Common Library:
  • Populate both artworkUri and artworkData in MediaMetadata.Builder.populate(MediaMetadata) when at least one of them is non-null (#964).
• ExoPlayer:
  • Prevent subclassing CompositeSequenceableLoader. This component was previously made extensible but was never subclassed within the library. Customizations can be done by wrapping an instance using the decorator pattern and implementing a custom CompositeSequenceableLoaderFactory.
  • Fix issue where repeating the same time causes metadata from this item to be cleared (#1007).
  • Rename experimentalSetSubtitleParserFactory methods on BundledChunkExtractor.Factory and DefaultHlsExtractorFactory to setSubtitleParserFactory and disallow passing null. Use the new experimentalParseSubtitlesDuringExtraction(boolean) methods to control parsing behaviour.
  • Add support for customising the SubtitleParser.Factory used during extraction. This can be achieved with MediaSource.Factory.setSubtitleParserFactory().
• Extractors:
  • MP3: Use constant bitrate (CBR) seeking for files with an Info header (the CBR equivalent of the Xing header). Previously we used the seek table from the Info header, but this results in less precise seeking than if we ignore it and assume the file is CBR.
  • MPEG2-TS: Add DTS, DTS-LBR and DTS:X Profile2 support (#275).
  • Extract audio types from TS descriptors and map them to role flags, allowing users to make better-informed audio track selections (#973).
• Image:
  • Add support for DASH thumbnails. Grid images are cropped and individual thumbnails are provided to ImageOutput close to their presentation times.
• Session:
  • Disable double-click detection for TV apps (#962).