'Twas brillig, and Stefan Schoenleitner at 13/04/10 16:23 did gyre and gimble: > Hi, > > I finally managed to write an ALSA I/O plugin that does what I want. > The plugin supports both playback and capture. > > Now I would like to write a simple audio application that takes audio > samples > > * from the microphone and plays it back on my plugin > and > * from the plugin (capture) and plays it back on the speakers > This sounds like something that would be more appropriate for jack http://jackaudio.org/ > Hence as long as the application is running, it should do the above. > > * Is there a special ALSA way to route audio from one PCM to another ? > > * If not, I suppose it would just work if I open the plugin PCM and the > hw PCM at the same time and copy audio frames between them ? Dealing with this can be quite complex, especially if the pcms are clocked of different sources, you have to deal with a degree of resampling to ensure that clock skew doesn't get out of control. The module-loopback plugin in PulseAudio does a similar thing (routes audio from a source to a sink) and as such has to deal with these clock skew problems. Col -- Colin Guthrie gmane(at)colin.guthr.ie http://colin.guthr.ie/ Day Job: Tribalogic Limited [http://www.tribalogic.net/] Open Source: Mandriva Linux Contributor [http://www.mandriva.com/] PulseAudio Hacker [http://www.pulseaudio.org/] Trac Hacker [http://trac.edgewall.org/] _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
