BTW, Quake is not the only program that uses mmap(/dev/dsp), nor even
the only game, though it may be the only well known one.
If the full-duplex stuff breaks mmap playback, the /dev/dsp driver
should at least clear the DSP_CAP_MMAP bit. So that programs which use
mmap when available and fall back to write() when not continue to work.
I know such programs exist: I wrote one.
Also I don't think it's obvious that all apps want 16 bit input and 8
bit output in full duplex mode. A record-to-disk program, music studio
etc. obviously wants 16 bit recording to have priority.
I'm not sure which way round an internet telephone program would prefer
-- 16 bit recording might produce a clearer encoding to send, but 16 bit
playback permits better filtering on the reconstructed signal at the
receiver.
A game with atmospheric sound effects and also a chat capability between
players would surely prefer 16 bit playback, so that the subtle effects
produced by the sound generator can be heard.
-- Jamie
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