683ece76db
Some audio implementations, notably samd, really don't like it when you return 0 samples of data. This was the case when reaching the end of an MP3 file. Now, we read forward in an MP3 file to the next sync word during "get_buffer", so that we can accurately return GET_BUFFER_DONE when the NEXT call WOULD HAVE resulted in 0 samples. Tested with @gamblor21's "laugh.mp3" file on a Trellis M4 Express.