Hi Stas, On Thu, Jul 17, 2003 at 08:07:25PM +0400, Stas Sergeev wrote: > Hello. > > Ryan Underwood wrote: > >The design is simple to me. The programmer of the > >application need do nothing but SynthOpen the correct > >devices, and then SynthWrite the data to them. > Sounds good. It would probably be a good > idea to provide an optional way to query > user's time and request the timer events > from user. It may be that the user's time > is different than the real time. dosemu > uses the real time, but AFAIK dosbox uses > the emulated time (CPU-emu relative). > It may also be possible that the real card's > sampling rate is not very precise (the pcsp > driver rounds the sampling rate rather cruely), > in which case you'll have one more timing > source with which you also have to keep in > sync. Last time I dealt with all that mess, > it wasn't very simple (see linux_sound.c :)
Ok, I will look into this. > >Plan to support the following synths in the library, all > >can be either hardware or emulated: > How are you accessing the hardware btw? > ioperm() ? For the OPL chips, I use the direct-FM API of OSS/ALSA. (This is not implemented yet because I do not have a working OPL-chip on my soundcard. I will swap out my card with SB16 to test it or else hack the vortex driver to get FM access). For any other chips, it will have to use iopl(3). I can create ALSA hwdep driver to handle all the other chips, but I might wait until people wiht the actual hardware request the capability. :) But the design of the library does not exclude it. > >The OPL-chip has an internal IRQ but it can be triggered > >or cleared by simply writing to the OPL's port. > AFAIK it is not even connected to any of > the PIC wires, but why can't you provide an > optional way to notify the user about an IRQ? > Simply calling the user's registered call-back > function might just do the trick, so why not? You have a good point, I will look into this. I rewrote the library last few days, now having trouble with some "chainsaw" noise in wolf3d music. :) Hopefully won't be hard too fix. Thanks, -- Ryan Underwood, <nemesis at icequake.net>, icq=10317253 - To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
