From mboxrd@z Thu Jan 1 00:00:00 1970 From: Halim Sahin Subject: really no idea? Re: a11y: howto reduce latency with alsa's dmix plugin? Date: Sun, 30 Aug 2009 16:13:38 +0000 (UTC) Message-ID: <20090830161338.GA13405@halim> References: <20090823095517.GA27741@halim> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) by alsa0.perex.cz (Postfix) with ESMTP id AC42C244E9 for ; Sun, 30 Aug 2009 18:13:55 +0200 (CEST) Received: from list by lo.gmane.org with local (Exim 4.50) id 1Mhn2O-0006G0-Jw for alsa-devel@alsa-project.org; Sun, 30 Aug 2009 18:13:52 +0200 Received: from pd9e0f333.dip.t-dialin.net ([217.224.243.51]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 30 Aug 2009 18:13:52 +0200 Received: from halim.sahin by pd9e0f333.dip.t-dialin.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 30 Aug 2009 18:13:52 +0200 Content-Disposition: inline In-Reply-To: <20090823095517.GA27741@halim> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On So, Aug 23, 2009 at 09:55:18 +0000, Halim Sahin wrote: > Hello, > Is there a way to reduce latency on audiocard if the dmix plugin is in > use? > I am asking because there is a strange problem with asistive > technologies which are outputing through alsa. > E. G. speech-dispatcher takes almost a half sec to stop the > speech-synthesizer. > If the user navigates quickly through menus, there are simultane outputs > at a time. > (tested with an usb logitech headset, snd-intel8x0 based card, > snd-hda-intel). > The same problem can be reproduced by running mplayer with alsa output > driver and pressing > quickly left/right arrow. > You should hear several samples at a time. > > Using an sblive card which doesn't use dmix doesn't have such problems. > > Using the dmix plugin should audio much faster to avoid this problem. > > Please help!!! > Regards > Halim -- Halim Sahin E-Mail: halim.sahin (at) t-online.de