Date: Sun, 25 Nov 2012 21:13:53 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-multimedia@freebsd.org Subject: Re: MIDIPP - music production with FreeBSD?! Message-ID: <201211252113.53953.hselasky@c2i.net> In-Reply-To: <1353872153.2508.186.camel@q> References: <201211241707.28230.hselasky@c2i.net> <201211252008.06595.hselasky@c2i.net> <1353872153.2508.186.camel@q>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sunday 25 November 2012 20:35:53 Ralf Mardorf wrote: > On Sun, 2012-11-25 at 20:08 +0100, Hans Petter Selasky wrote: > > I wrote this simple tool to be able to handle more than stero. The device > > I've got provides 7+1 channels playback and recording. I didn't check if > > jack supports that. Also there are some problems with audio delay and > > such when using jack. Probably not configured properly. And I needed to > > have control on sample rate drifting with regard to input and output. > > VirtuallOSS is using cuse4bsd to provide a non-resampled audio device. > > This is the same jack as for Linux? If so, jack doesn't add latency and > can handle more than enough ports. Latency is from the backend/hardware > and the clients have to provide the ports. Jack doesn't do resampling. > It's impossible to misconfigure jack in a way, that it will add latency. > > Much more, on Linux the -Xalsarawmidi switch for jack2, aka jackdmp (not > for jack1, aka jackd) does enable zero MIDI jitter, when using good MIDI > devices, IOW PCI and PCIe devices, USB always will produce MIDI jitter. > > Regards, > Ralf > Hi, My observation is for example that Zynadsubfx produces noticable less delay when using the OSS backend versus using the JACK backend. I have not investigated why. Thanks for your insight. --HPS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201211252113.53953.hselasky>