From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick Shirkey Subject: Re: Experimental USB audio support Date: Thu, 30 May 2002 13:12:28 +0900 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3CF5A6AC.A8967313@boosthardware.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Takashi Iwai Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org This is great but it seems that the cvs server is down :( Takashi Iwai wrote: > > Hi, > > right now you can find a driver for USB audio on cvs. > it's in alsa-driver not in alsa-kernel. > the driver will be built automatically when CONFIG_USB is specified in > kernel config. > > please note that this driver is EXPERIMENTAL and TENTATIVE. > my first plan was to implement a USB library layer on alsa-lib, but it > was found out that implementation of isochronous transfer via > usbdevfs will bring some difficulty. so i started coding of a normal > kernel driver at first. > if any feasible solution to port such a stuff into user space, we > should do that. > > but anyway, it's good to have a working code. we can move it to other > place later. > > the current code is partly based on OSS/USB audio.c code, but apart > from the parsing routine of audio-streaming, the resultant codes > became fairly different from the oss code. > > almost all mixer controls are supported except for graphic equalizer. > the mapping of topology might not be perfect, since alsa has a plain > control structure. > > so far, i've tested only audio playback on my speaker, which is > adaptive out without pitch/freq setting. xmms is working. > the driver accepts the period size up to 1ms. a courageous user can > try such a heavy condition. (me? did not yet :) > 24bit / 96kHz should work, too, but i have no such a hardware. > besides, capture is not tested at all. > > if you have a usb audio device, please test once. > (oh, i forgot to mention the driver name - it's "snd-usb-audio" > quite easy, isn't it?) > > if you find somewhat strange behavior (especially in mixer controls), > please send me the output of lsusb. > > btw, when you use snd-usb-audio module, please make sure that you > don't load OSS audio.o together. hotplug likely loads both modules at > the same time. > > ciao, > > Takashi > > _______________________________________________________________ > > Don't miss the 2002 Sprint PCS Application Developer's Conference > August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-devel -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.boosthardware.com/LAU/guide/ ======================================================================= _______________________________________________________________ Don't miss the 2002 Sprint PCS Application Developer's Conference August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm