51 lines
2.3 KiB
Plaintext
51 lines
2.3 KiB
Plaintext
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Things to do for the matcd driver 6-Apr-95
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1. Just as I was finishing Edit 16, I discovered that there
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may be a way to cause a drive to go "offline", allowing the host
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to send a command to one or more other drives on the same
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interface, similar to the SCSI disconnect mechanism. The changes
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to the driver to take advantage of this aren't huge, but will have
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to wait until after 2.1. Too much risk of breaking something.
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Unless you have multiple drives, you won't see a difference.
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2. Someone wants to switch all drivers from disklabel and
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its assorted mechanisms over to disk slicing and its mechanisms,
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but I was unable to find any useful documentation on how to
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implement the changes for a read-only, single-partition,
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removable (ie, partition can change size) device.
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So this will have to wait until after 2.1.
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3. Support for reading R-W subcodes while playing audio. This would be
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useful if you have any CD+G or CD+MIDI discs, but the demand for this
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is pretty low, unless you like Karaoke. Someone will also have to
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write a CD+G viewer for X. The code for the driver to add this is
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pretty minor but there aren't any precedents on how to handle the
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data transfer to the application.
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4. Support for reading the ISBN and UPC labels. The ioctl structures
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for these appear to be defined but no other driver seems to do this.
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5. Multi-session support. There are two forms of this; what
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Philips defined and what Kodak uses. This will be quite
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complicated and will probably require changes in the filesystem
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layer. The drive support for Kodak multi-session is known to work.
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6. Multiple data tracks. My vision here was to add an ioctl
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that caused a track offset to be inserted into block requests,
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effectively shifting the base to the specified track. Very
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easy to add but not a big deal since I have only two discs
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in my collection that have multiple data tracks and I mastered
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one of them.
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7. A curses-based CD-Player app (ie, not X). I will probably do this
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mainly for its value as a debugging tool. It was pretty annoying
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not finding a single application that actually issued all the
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defined ioctls, let alone any new ones.
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If you feel the urge to work on one or more of these remaining items,
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please contact the author first at bsdmail@nemesis.lonestar.org
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to make sure the work hasn't already been done or started.
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Frank Durda IV
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