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Re: Fwd: Re: Audio - In kernel audio mixing
Hi Brian,
On Tue, 17 May 2016 03:04:32 Brian Buhrow wrote:
> hello. I'll echo Brad's questions about latency and delay. Delay,
> when it comes to audio presentation, is bad. I was recently at a talk
> where the developer was discussing trying to synchronize one audio source
> with another. For their application, they're sending audio sources from
> two locations over WiFi and other wireless technologies. Their goal was to
> make sure the sychronized audio was never more than 25ms out of sync, and,
> hopefully, a lot less. If my latency budget is only 50-100ms for a given
> audio application, I'd hate to spend so much of that budget before I even
> get out of the kernel. I don't know what the latency is for the
> traditional audio drivers is, but I can tell you it varies depending on the
> driver in question. For example, the auich(4) and emuxki(4) drivers are
> very responsive with low latency. However, the uaudio(4) driver exhibits
> considerably more delay in its operation. If these vaudio drivers are
> slower than the uaudio(4) driver, then I'd suggest working to get that
> delay down. If that's just not feasible, then the traditional audio(4)
> interface should remain viable for those of us who need very responsive
> audio performance.
>
> -thanks
> -Brian
Please check out ftp.netbsd.org/pub/NetBSD/misc/nat/nexaudio3-kern.diff as it
introduces no additional latency or delay.
Best regards,
Nat.
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