PLAYTUNE implementation.

[RyanBurnside]

It would be nice if PLAYTUNE could be implemented in Maiko.

Even though it's not strictly attached to a keyboard with speaker, perhaps an SDL interface could be made to work. I think LAFITE as well as some of the games use it.

[nbriggs]

As I understand it, SDL doesn't have built-in tone generator code -- you have to generate the full audio sample stream, which seems overkill for the beep function.

[RyanBurnside]

Yeah, it appears you would have to procedurally fill a stream with a sine wave.
I was thinking it would be fun for music, but there are probably bigger fish to fry.

I did some AI slop and got a result but that kind of thing makes subtle and possibly dangerous assumptions.

[nbriggs]

@RyanBurnside - same, almost. Though the interface that Lisp depends on is subrs for (BEEPON frequency) and (BEEPOFF) - no duration, it just waits for a timer to expire on the Lisp side, so the code driving SDL's audio output has to generate an indefinite length stream at BEEPON, and then hope to stop it (perhaps pause it and then flush the stream) at BEEPOFF. It might be possible for the "callback" in the interface to just requeue a fixed size buffer repeatedly, if pause/flush works to stop it. Not a high priority item, but still interesting to consider. See the Lisp code in lispusers/PLAY if you haven't already looked.