From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Revell Subject: Re: emu10k1 device naming Date: Sun, 25 Jul 2004 14:15:07 -0400 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <1090779307.14951.24.camel@mindpipe> References: <1090729766.1952.7.camel@mindpipe> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Jaroslav Kysela Cc: alsa-devel List-Id: alsa-devel@alsa-project.org On Sun, 2004-07-25 at 04:15, Jaroslav Kysela wrote: > On Sun, 25 Jul 2004, Lee Revell wrote: > > > Now that the emu10k1 driver supports low latency, multichannel capture, > > it would be useful to rearrange the devices. Currently you have to use > > hw:0,0 for playback, and hw:0,2 for capture. This works down to 32 > > frames (you have to record more than 2 channels to get 32 frames, > > because 512 bytes is the smallest period JACK supports). JACK requires > > the playback and capture device to be the same for both directions. > > > > The current hw:0,0 device could be moved to hw:0,2. This is the best > > arrangement, because these are the only two devices that it makes sense > > to use for full-duplex. The hw:0,2 playback device is a special AC3 > > passthrough device, there is no capture device that corresponds to it. > > The same applies to the current hw:0,0 (ADC capture) and hw:0,1 (mic > > capture - 8000 Hz) devices, there is no corresponding playback device. > > > > It was suggsted to use the 'asym' PCM plugin for this, but JACK does not > > support using a PCM as the device name, you need to give it a hardware > > device. > > JACK should be corrected. Complain there. I wonder why people always fix > the drivers instead of applications. > Good point, this would be much easier to correct in JACK, than fix every driver to conform. There actually is no 1:1 correspondence between any of the capture and playback devices, so it's arbitrary to require the playback and a capture device to have the same hw index. Lee ------------------------------------------------------- This SF.Net email is sponsored by BEA Weblogic Workshop FREE Java Enterprise J2EE developer tools! Get your free copy of BEA WebLogic Workshop 8.1 today. http://ads.osdn.com/?ad_id=4721&alloc_id=10040&op=click