From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0000557]: SNDCTL_DSP_GETOPTR not working correctly in specific situation Date: Sat, 9 Apr 2005 16:22:29 +0200 Message-ID: <977df797899d7a992980228fdf3db479@bugtrack.alsa-project.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [82.113.61.162]) by alsa.alsa-project.org (ALSA's E-mail Delivery System) with ESMTP id E8D5924F for ; Sat, 9 Apr 2005 16:22:29 +0200 (MEST) Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org A NOTE has been added to this issue. ====================================================================== ====================================================================== Reported By: minmax Assigned To: ====================================================================== Project: ALSA - driver Issue ID: 557 Category: CORE OSS - pcm Reproducibility: always Severity: minor Priority: normal Status: new Distribution: Debian unstable Kernel Version: vanilla 2.6.7 ====================================================================== Date Submitted: 10-01-2004 16:18 CEST Last Modified: 04-09-2005 16:22 CEST ====================================================================== Summary: SNDCTL_DSP_GETOPTR not working correctly in specific situation Description: When the first few writes to the oss emulation device are done in specific way, SNDCTL_DSP_GETOPTR returns wrongly huge results in info.bytes ====================================================================== ---------------------------------------------------------------------- jdthood - 04-09-05 16:09 ---------------------------------------------------------------------- Submitter: Does this bug still exist? Can you give more details about the specific situation in which it appears? ---------------------------------------------------------------------- minmax - 04-09-05 16:22 ---------------------------------------------------------------------- i've got new laptop since i reported this bug. I've stumbled upon a bug when using Cinelerra (video editing software), and since then i have patched the software to ignore the excessively wrong results gotten from SNDCTL_DSP_GETOPTR if(!ioctl(get_output(0), SNDCTL_DSP_GETOPTR, &info)) { //printf("AudioOSS::device_position %d %d %d\n", info.bytes, device->get_obits(), device->get_ochannels()); // workaround for ALSA OSS emulation driver's bug // the problem is that if the first write to sound device was not full lenght fragment then // _GETOPTR returns insanely large numbers at first moments of play if (info.bytes > 2100000000) return 0; else return info.bytes / (device->get_obits() / 8) / device->get_ochannels(); } Issue History Date Modified Username Field Change ====================================================================== 10-01-04 16:18 minmax New Issue 10-01-04 16:18 minmax Distribution => Debian unstable 10-01-04 16:18 minmax Kernel Version => vanilla 2.6.7 10-02-04 10:52 minmax Issue Monitored: minmax 04-09-05 16:09 jdthood Note Added: 0004406 04-09-05 16:22 minmax Note Added: 0004410 ====================================================================== ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click