Messages in this thread | | | Date | Tue, 10 Jan 2006 10:43:44 +0100 (CET) | From | Jaroslav Kysela <> | Subject | Re: [OT] ALSA userspace API complexity |
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On Fri, 6 Jan 2006, Hannu Savolainen wrote:
> On Thu, 5 Jan 2006, Lee Revell wrote: > > > On Fri, 2006-01-06 at 01:06 +0200, Hannu Savolainen wrote: > > > We have not received any single bug report that is caused > > > by the concept of kernel mixing. > > > 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. > > > > Hey, interesting, this is exactly what dmix does in userspace. And we > > have not seen any bug reports caused by the concept of userspace mixing > > (just implementation bugs like any piece of software). > Having dmix working in user space doesn't prove that kernel level mixing > is evil. This was the original topic.
Overloading interrupt handlers with extra things is evil (and I bet you're mixing samples in the interrupt handler). Even the network stack uses interrupts only for DMA management and not for any extra operations.
Jaroslav
----- Jaroslav Kysela <perex@suse.cz> Linux Kernel Sound Maintainer ALSA Project, SUSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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