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This is mainly a NO-OP, introducing a new PlaybackBuffer type and preparing for its use. At this point in time, the buffer is just a power-of-two sized ringbuffer and the disk-reader's read-logic is still unchanged. Eventually the read and write sample position that are currently private to the disk-reader can be migrated to be owned by the buffer. Also Diskreader::read() positions can be matched to read-position .. +/- buffer reservation and de-click can read w/o committing the read.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html