Messages in this thread | | | Date | Fri, 6 Jan 2006 08:47:02 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: [OT] ALSA userspace API complexity |
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>> > If you have sound device without this soft mixing is moved to user space >> > .. but applications do not need know about this even now because all >> > neccessary details are handled on library level. Is it ? >> > So question is: why the hell *ALL* mixing details are not moved to kernel >> > space to SIMPLE and NOT GROWING abstraction ? >> >> Because many people believe that the softmix in the kernel space is >> evil. >> >This is the usual argument against kernel level mixing. Somebody has once >said that all this is evil. However this is not necessarily correct. >
I'm going with "is evil". Better let userspace have a segfault than a kernel oops. I am having quite a moody feeling when running even my own things like http://alphagate.hopto.org/quad_dsp/
>Kernel mixing is not rocket science. All you need to do is picking a >sample from the output buffers of each of the applications, sum them >together (with some volume scaling) and feed the result to the physical >device. Ok, handling different sample formats/rates makes it much more >difficult but that could be done in the library level.
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