SDK / exoplayer

The release_input_buffer callback will be called when the library
is done consuming an "input buffer". The buffer passed into
EnqueueFrame must be kept valid until this callback is called. If
frame parallel is false, then this callback can be nullptr (in
this case the buffer has to be kept valid until the next call to
DequeueFrame). If frame parallel is true, this callback cannot be
nullptr.

PiperOrigin-RevId: 296276083