The start time was derived rather than reported by foobar2000; expect tens of milliseconds of error.
Index in the result's planes where this run begins; the first run begins at 0.
null when the segment is unknown.
Segment number, rising by one per segment and kept across a format
change. null when the frames are older than every entry the buffer
still lists, or the buffer carries no segment table (version 1).
Track time in seconds of the frame at offset; null when the segment is unknown.
One run of frames with continuous media time within a PcmRingReader.read result.