As far as I can tell it is just like opening reading and writing at the same time. For example, I can run arecord and aplay on the same card at the same time without doing anything special ( this may of course depend on the card-- if the card cannot support duplex, nothing you do will work). So as far as I can tell, just use your software to open the play and record devices and play and record. On Tue, 5 Jan 2010, Preston wrote: > Hello to all, > > I am in the midst of attempting duplex audio (capture and playback) on an Atmel > 9260 board with a dumb codec attached, Linux-2.6.28.8. I must first state that > I am completely new to ALSA and audio development in general, let alone on an > embedded level, but have learned a great deal from reading. I am fortunate > enough to have a working driver for the codec and have aplay and arecord > functioning well with it, but am at a point where I do not know how to work with > duplex audio. I have done a great deal of reading on the asym plugin but quite > frankly feel like I'm missing something. > > my test software is able to control capture and playback streams easily enough > (half-duplex essentially), but opening a duplex style stream just doesn't seem > as straight forward as snd_pcm_open(stream stuff....). Has anybody worked with > duplexing the streams using the asym alsa plugin? I would appreciate any help > in direction in this matter, and unfortunately since I'm so new to ALSA, I don't > even know the proper way to ask my questions. So in short, I need to setup a > duplexed stream (or a method of having capture and playback open at the same > time on the same sound card) that I can write and read to from software. > > I'm sure I left out plenty of information and didn't want to crowd the post with > code, so if there is specific information that is needed please let me know. > > Thanks > > Preston > > > ------------------------------------------------------------------------------ > This SF.Net email is sponsored by the Verizon Developer Community > Take advantage of Verizon's best-in-class app development support > A streamlined, 14 day to market process makes app distribution fast and easy > Join now and get one step closer to millions of Verizon customers > http://p.sf.net/sfu/verizon-dev2dev > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user > -- William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
