Thanks, that's what we decided to do. I have a question regarding closing the pulseaudio sinks/source. Should I use pa_context_suspend_sink/source_by_index/name or just mute them? I'm not sure exactly what pa_context_suspend_sink_by_index should do; I've tried using it and it didn't seem to have any effect (i.e. I could still hear the sound). Colin Guthrie wrote: > Ioana Ivan wrote: > >> Hi, >> >> We've been trying to write an implementation of >> javax.sound.sampled.Mixer(and the associated classes: SourceDataLine, >> TargetDataLine, Clip, and Port) that uses pulseaudio as a backend. So >> far, SourceDataLine, TargetDataLine and Clip are working (somewhat, >> there are still issues that need to be fixed), but we're not sure how to >> approach Port. >> >> From the java API: >> "Ports are simple lines for input or output of audio to or from audio >> devices. Common examples of ports that act as source lines (mixer >> inputs) include the microphone, line input, and CD-ROM drive. Ports that >> act as target lines (mixer outputs) include the speaker, headphone, and >> line output. You can access port using a Port.Info object." >> >> Ports should have an open() and close() method, and ideally they should >> also support volume and mute controls. There currently is an >> implementation of Port in openjdk that uses alsa to enumerate the >> devices that could connect to the sound system, and implement the >> required methods. >> >> We were wondering whether there's anything in the pulseaudio API that >> could be used to do something similar, and, if not, how problematic >> using the old version of Port(that uses alsa directly) with our mixer >> that uses pulseaudio is. >> > > I spoke to you on the mailing list but this is a little clearer I think. > > Basically you just want to expose the volume of the various Sinks and > Sources here. I would just get a list of all the Sinks and provide > playback Ports that allow volume control and muting etc. and do a > similar exposure for the Sources. > > I'd use the introspection stuff to do this (tho' not overly sure). > > http://0pointer.de/lennart/projects/pulseaudio/doxygen/introspect_8h.html > > You can probably use the source of pavucontrol to work out what to do here. > > You can of course export a volume on a "per stream" basis, but I'd > imagine this doesn't map too well to the Java API seeing as streams will > come and go quickly but sinks/sources will be slightly more long term > (tho can still come and go (e.g. when a usb audio device is plugged in > or a network sink is detected etc.) > > > I think whatever is in the "Output devices" and "Input devices" tab in > pavucontrol (from git) is probably what you want... > > > HTHs > > Col > >
