Short: play and save digital audio
Type: disk/cdrom
Uploader: mlelstv@specklec.mpifr-bonn.mpg.de
Author: mlelstv@specklec.mpifr-bonn.mpg.de

Read audio data from a CD-DA disk (normal audio CDs) and play back
via audio.device (22kHz) and store to outputfile (stereo, 16bit signed,
big endian, 44.1kHz, suitable for 'sox').

usage:

cdda START,LENGTH,TRACK,VOL/N,FILE,16BIT/S,MONO/S,LIST/S,DEBUG/S,BUFS/N

START  = startblock
LENGTH = number of blocks
TRACK  = start relativ to track number
VOL    = volume in percent (0..800)
16BIT  = experimental high resolution mode
MONO   = map stereo to single channel (for audio output only)
LIST   = show table of contents
DEBUG  = print lots of debugging info through debug.lib (use sushi!)
BUFS   = number of CD blocks to do in a single read.. default is 16

You can use the environment variables CDDA_DEVICE and CDDA_UNIT to choose
something else than the default ("scsi.device" and 2).

To accomodate for older device drivers you can ask for a specific memory type
used for all SCSI-direct buffers. This is done with the environment variable
CDDA_BUFMEMTYPE. A value of 2 asks for chip memory, a value of 512 asks for
memory reachable by Zorro-2 DMA controllers. Even for controllers that do
not need a specific memory type it might show better performance.

There's a tiny program called 'led' in the archive which toggles the
audio lowpass filter on newer machines. Disabling the lowpass filter
will usually get better audio quality but may cause aliasing distortion
depending on the bandwidth of your speakers.

Michael van Elst