From mboxrd@z Thu Jan 1 00:00:00 1970 From: Halim Sahin Subject: a11y: howto reduce latency with alsa's dmix plugin? Date: Sun, 23 Aug 2009 09:55:18 +0000 (UTC) Message-ID: <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 B450B24346 for ; Sun, 23 Aug 2009 11:55:42 +0200 (CEST) Received: from list by lo.gmane.org with local (Exim 4.50) id 1Mf9nY-0004wY-1u for alsa-devel@alsa-project.org; Sun, 23 Aug 2009 11:55:40 +0200 Received: from pd9e3f341.dip.t-dialin.net ([217.227.243.65]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 23 Aug 2009 11:55:40 +0200 Received: from halim.sahin by pd9e3f341.dip.t-dialin.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 23 Aug 2009 11:55:40 +0200 Content-Disposition: inline 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 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