On Wed, 2010-09-15 at 15:37 +0100, Colin Guthrie wrote: > > Most important to me is to figure out how you make the module > > unload/load automatically as the headphone jack is plugged/unplugged. > > Right now the module just fails to load if the master port is not the > > one for the headphones. > > Ultimately you'll have to make the module listen to the > PA_CORE_HOOK_SINK_STATE_CHANGED hook. The callback assigned to this hook > will be called whenever a sink changes in the PA daemon (e.g. when it's > port is changed). You can inspect the current active_port and either > load, unload or noop as appropriate the actual sink object itself. This is not entirely correct. PA_CORE_HOOK_SINK_STATE_CHANGED is fired only when the pa_sink.state variable changes, not when the active port changes. For monitoring port changes, either implement a new hook (PA_CORE_HOOK_SINK_PORT_CHANGED) and use it, or use the asynchronous subscription system (see src/pulsecore/core-subscribe.h for the API). I would prefer the first alternative - the synchronous hook callbacks are easier to get right than the asynchronous subscription callbacks. -- Tanu Kaskinen
