cme@ihug.co.nz ("Chris Edwards") writes:

>    u_int per=eclockfreq*5/freq;

>    if (per<124)
>        per=124;    /* must have at least 124 ticks between samples */

>Wouldn't this only be necessary when the system is using a plain old PAL/NTSC screenmode?

No.


>So, is there anything potentially "bad" about loosening the restriction on the period in this way (or even removing it altogether)?

The period also determines how soon playback of a buffer completes and
thus determines the interrupt rate for reloading the buffer pointers.
Therefore you should have at least some limit, otherwise you could
send the machine into a tight interrupt loop by chosing a too high
playback frequency.



>My second question is about the low-pass audio filter (and the corresponding power LED brightness) on many Amiga models.  It seems that NetBSD just leaves the filter in whatever state it's in when it's booted, which is on (LED bright) on my 1200.  It would be nice for there to be a kernel option to set the initial filter state to "off", since playing audio in 14-bit at 44.1 kHz with the filter on is a bit pointless!

Maybe the audio driver should just chose the filter setting depending
on the sample frequency ? Anything below 8kHz should have the filter
enabled to reduce aliasing distortion.


-- 
-- 
                                Michael van Elst
Internet: mlelstv@serpens.de
                                "A potential Snark may lurk in every tree."