RE: [linux-audio-dev] ioctl() call fails. (fwd)

In brief - ioctl calls are the way the UNIX/Linux environment can configure devices. The software you are using is attempting to manipulate the sound card device but the driver does not support it. This particular ioctl request (SNDCTL_DSP_GETODELAY) is not widely implemented on older sound card drivers. -----Original Message----- From: linux-audio-dev-admin(a)music.columbia.edu [mailto:linux-audio-dev-admin@music.columbia.edu]On Behalf Of Doru-Catalin Togea Sent: Wednesday, July 09, 2003 11:29 PM To: linux-audio-dev(a)music.columbia.edu Subject: [linux-audio-dev] ioctl() call fails. (fwd) Hi! I posted the following on the comp.os.linux.development.apps newsgroup, but I believe that maybe this forum is even more appropriate for the questions I have. (I would have cross-posted if I knew how to cross-post between a news-group and an e-mail based disscussion group. I am using PINE). ---------- Forwarded message ---------- Date: Thu, 10 Jul 2003 08:25:00 +0200 From: Doru-Catalin Togea &lt;doru-cat(a)ifi.uio.no&gt; Newsgroups: comp.os.linux.development.apps Subject: ioctl() call fails. Hi! I am running RedHat 9.0 on a Toshiba Sattelite. It has a Yamaha sound-card which has been identified by the sound-card configuration programme to be a "YMF-745 [DS-1E Audio Controller]" card, and the "ymfpci" module is used for it. I can test-play the sound in the sound-card configuration programme, I can play music CD's with the CD-Player application shipped with RedHat 9.0 and I can play mp3s with xmms (after installing its mp3 support). So I guess my sound-card is pretty much up and running. I am using my PC for some research work involving multimedia (I am working on my master's thesis). I have compiled a set of tools implementing an adaptive video streaming protocol, (the Quasar Pipeline, available from http://ogiworks.org/quasar/) but when playing back video with sound enabled the application crashes with the following message: ** ERROR **: SNDCTL_DSP_GETODELAY: Inappropriate ioctl for device aborting... Aborted I can playback the video with sound disabled. I also had the same problem with Redhat 7.3, so I guess the cause of the problem is my sound-card. Can anyone tell me what the ioctl() does? I read the man page but it is scarce. The author of the software I have installed tells me that the call is issued in order to synchronize video and audio playback. I guess some of you have quite some programming experience, so I wonder what do your guts tell you about this situation? Do you think that if I could track down the place(s) where the call(s) is/are made I could then adjust the calls so that my sound-card will understand the call(s)? Or is my card so old that it does not support the ioctl() call at all? Thanks if anyone can help, Catalin -- <<<< ================================== >>>> << We are what we repeatedly do. >> << Excellence, therefore, is not an act >> << but a habit. >> <<<< ================================== >>>>