[pulseaudio-discuss] HELP REQUIRED: pre-emptive streams

Justin Tulloss jmtulloss at gmail.com
Thu Jul 12 10:34:52 PDT 2007

Here's a patch that adds the idea of a stream "class" to alsa-streams. It's
against alsa-plugins-1.0.14a. All it does is prepend the name of the ALSA
stream with the class that you indicated. You can put a default class in the
asound.conf file, and also reconfigure it on the fly.

Asound.conf example:

        type pulse
        class app

Runtime configuration example:

* 1:*     int err;
* 2:*     snd_config_t* classconf;
* 3:*
* 4:*     snd_config_update();
* 5:*     //you can replace "pulse" with "default" if pulse is set up
as your default device
* 6:*     err=snd_config_search(snd_config, "pcm.pulse.class", &classconf);
* 7:*
* 8:*     if(!err)
* 9:*         snd_config_set_string(classconf, "alert");
*10:*     else
*11:*     {
*12:*         snd_config_make(&classconf, "pcm.pulse.class",
*13:*         snd_config_set_string(classconf, "alert");
*14:*         snd_config_add(snd_config, classconf);
*15:*     }

Let me know if you have any problems or questions.

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