Tweaking Caching to achieve desired behaviour.

Context: App operates on small progressive m4a files from server. (3-10mb range)

• App already has a mapping logic to convert a URL -> File Path on local device where file will be saved.

Current Logic:

• Start the playback with url while caching it, as normal.
• by default when using SimpleCache with data source, exoplayer prduces files named 1.xxx.v3.exo in cache directory
  • Simple Cache Sink was constructed using .setFragmentSize(C.LENGTH_UNSET) to disable fragmentation.
• rest as per documentation.

Behaviour Needed:

• Having a CacheSource which can:
  • 1. Start Playback using URL from server while caching it into said mapped local file path (single m4a file is needed).
  • 2. when mediaItem is again played it can check if above file.exists() if it does, load that else do step a.

Compromises acceptable:

• File is played from network and cached as in fragments as is done now, but after completion it should be saved into the said file by reading into it.
• and when done, next time player should always use above saved file if it exists.

will appreciate any help / pointing me to the right direction.