Hi alsa guys,

We're working on a ruby binding for alsa : http://projects.tryphon.eu/ruby-alsa/. PCM Playback and Capture are supported for a long time (and used in production for several months). Ruby developers can find the gem on http://rubygems.org/gems/ruby-alsa.

But we're trying to investigate a problem with "duplex mode" : http://projects.tryphon.eu/ruby-alsa/ticket/4. We can't find a way to record and playback simple stereo streams in the same process without dummy hackings :-/ We don't need an extreme latency, just a simple process to add/receive streams on network (our LinkStream/LinkBox project).

I hopes it's only a misusage of the ALSA API or a mistake in hardware/software configurations. But after several weeks on this problem, we need fresh ideas :)

Even if you have no idea about ruby, the Playback [0] and Capture [1] are very simple wrappers around the native ALSA API [2] (mapped with ruby ffi [3]). The alsa device is opened and configured using a shared open method in Stream [4]. Very few code in fact.

I hope an expert eye will find a beginning of solution ;)

Kind regards,

0. http://projects.tryphon.eu/ruby-alsa/browser/lib/alsa/pcm/playback.rb 1. http://projects.tryphon.eu/ruby-alsa/browser/lib/alsa/pcm/capture.rb 2. http://projects.tryphon.eu/ruby-alsa/browser/lib/alsa/pcm/native.rb 3. http://github.com/ffi/ffi 4. http://projects.tryphon.eu/ruby-alsa/browser/lib/alsa/pcm/stream.rb