From owner-freebsd-multimedia@FreeBSD.ORG Sun Nov 25 20:12:25 2012 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 0525EA33 for ; Sun, 25 Nov 2012 20:12:25 +0000 (UTC) (envelope-from hselasky@c2i.net) Received: from swip.net (mailfe02.c2i.net [212.247.154.34]) by mx1.freebsd.org (Postfix) with ESMTP id 7F3828FC0C for ; Sun, 25 Nov 2012 20:12:24 +0000 (UTC) X-T2-Spam-Status: No, hits=0.8 required=5.0 tests=ALL_TRUSTED, BAYES_50,PLING_QUERY Received: from [176.74.213.204] (account mc467741@c2i.net HELO laptop015.hselasky.homeunix.org) by mailfe02.swip.net (CommuniGate Pro SMTP 5.4.4) with ESMTPA id 349625880; Sun, 25 Nov 2012 21:12:14 +0100 From: Hans Petter Selasky To: freebsd-multimedia@freebsd.org Subject: Re: MIDIPP - music production with FreeBSD?! Date: Sun, 25 Nov 2012 21:13:53 +0100 User-Agent: KMail/1.13.7 (FreeBSD/9.1-PRERELEASE; KDE/4.8.4; amd64; ; ) References: <201211241707.28230.hselasky@c2i.net> <201211252008.06595.hselasky@c2i.net> <1353872153.2508.186.camel@q> In-Reply-To: <1353872153.2508.186.camel@q> X-Face: 'mmZ:T{)),Oru^0c+/}w'`gU1$ubmG?lp!=R4Wy\ELYo2)@'UZ24N@d2+AyewRX}mAm; Yp |U[@, _z/([?1bCfM{_"B<.J>mICJCHAzzGHI{y7{%JVz%R~yJHIji`y>Y}k1C4TfysrsUI -%GU9V5]iUZF&nRn9mJ'?&>O MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201211252113.53953.hselasky@c2i.net> X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 25 Nov 2012 20:12:25 -0000 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