source: smplayer/trunk/src/deviceinfo_pulse.cpp

#if USE_PULSEAUDIO_DEVICES
#include <pulse/context.h>
#include <pulse/glib-mainloop.h>
#include <pulse/introspect.h>
#include <pulse/operation.h>
#include <QApplication>

QMap<int, QString> pulse_device_list;
bool pulse_list_done = false;

void sink_cb(pa_context *, const pa_sink_info *i, int eol, void *) {
        if (eol == 0) {
                qDebug() << "DeviceInfo::sink_cb: sink #" << i->index << ":" << i->name;
                pulse_device_list[i->index] = i->name;
        } else {
                pulse_list_done = true;
        }
}

void context_state_cb(pa_context *c, void *) {
        qDebug() << "DeviceInfo::context_state_cb";

        pa_context_state_t state = pa_context_get_state(c);

        if (state == PA_CONTEXT_READY) {
                pa_operation *o;

                if (!(o = pa_context_get_sink_info_list(c, sink_cb, NULL))) {
                        qWarning() << "DeviceInfo::context_state_cb: pa_context_get_sink_info_list failed";
                        return;
                }
                pa_operation_unref(o);
        }
}

DeviceList DeviceInfo::paDevices() {
        qDebug("DeviceInfo::paDevices");
        DeviceList l;

        if (!pulse_list_done) {
                pa_glib_mainloop *mainloop = pa_glib_mainloop_new(NULL);
                pa_mainloop_api *api = pa_glib_mainloop_get_api(mainloop);
                pa_context *context = pa_context_new(api, "smplayer");

                if (pa_context_connect(context, NULL, PA_CONTEXT_NOFAIL, 0) < 0) {
                        pa_context_unref(context);
                        return l;
                }
                pa_context_set_state_callback(context, context_state_cb, NULL);

                // Wait for a while until the list is complete
                for (int n = 0; n < 1000; n++) {
                        QApplication::processEvents();
                        if (pulse_list_done) {
                                qDebug("DeviceInfo::paDevices: list done (%d)", n);
                                break;
                        }
                }
        }

        if (!pulse_list_done) {
                qWarning("DeviceInfo::paDevices: list is not done yet!");
        }

        QMapIterator<int, QString> i(pulse_device_list);
        while (i.hasNext()) {
                i.next();
                l.append(DeviceData(i.key(), i.value()));
        }

        return l;
}
#endif // USE_PULSEAUDIO_DEVICES