Putting an interface in for volume control

1 files changed, 917 insertions, 0 deletions

diff --git a/src/volume-control-pulse.vala b/src/volume-control-pulse.vala
new file mode 100644
index 0000000..1e81ce1
--- /dev/null
+++ b/src/volume-control-pulse.vala
@@ -0,0 +1,917 @@
+/*
+ * -*- Mode:Vala; indent-tabs-mode:t; tab-width:4; encoding:utf8 -*-
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *      Alberto Ruiz <alberto.ruiz@canonical.com>
+ */
+
+using PulseAudio;
+using Notify;
+using Gee;
+
+[CCode(cname="pa_cvolume_set", cheader_filename = "pulse/volume.h")]
+extern unowned PulseAudio.CVolume? vol_set (PulseAudio.CVolume? cv, uint channels, PulseAudio.Volume v);
+
+[DBus (name="com.canonical.UnityGreeter.List")]
+interface GreeterListInterface : Object
+{
+    public abstract async string get_active_entry () throws IOError;
+    public signal void entry_selected (string entry_name);
+}
+
+public class VolumeControlPulse : VolumeControl
+{
+	/* this is static to ensure it being freed after @context (loop does not have ref counting) */
+	private static PulseAudio.GLibMainLoop loop;
+
+	private uint _reconnect_timer = 0;
+
+	private PulseAudio.Context context;
+	private bool   _mute = true;
+	private bool   _is_playing = false;
+	private double _volume = 0.0;
+	private double _mic_volume = 0.0;
+
+	/* Used by the pulseaudio stream restore extension */
+	private DBusConnection _pconn;
+	/* Need both the list and hash so we can retrieve the last known sink-input after
+	 * releasing the current active one (restoring back to the previous known role) */
+	private Gee.ArrayList<uint32> _sink_input_list = new Gee.ArrayList<uint32> ();
+	private HashMap<uint32, string> _sink_input_hash = new HashMap<uint32, string> ();
+	private bool _pulse_use_stream_restore = false;
+	private uint32 _active_sink_input = -1;
+	private string[] _valid_roles = {"multimedia", "alert", "alarm", "phone"};
+	public override string stream {
+		get {
+			if (_active_sink_input < 0 || _active_sink_input >= _valid_roles.length)
+				return "multimedia";
+			else
+				return _valid_roles[_active_sink_input];
+		}
+	}
+	private string? _objp_role_multimedia = null;
+	private string? _objp_role_alert = null;
+	private string? _objp_role_alarm = null;
+	private string? _objp_role_phone = null;
+	private uint _pa_volume_sig_count = 0;
+
+	private DBusProxy _user_proxy;
+	private GreeterListInterface _greeter_proxy;
+	private Cancellable _mute_cancellable;
+	private Cancellable _volume_cancellable;
+	private uint _local_volume_timer = 0;
+	private uint _accountservice_volume_timer = 0;
+	private bool _send_next_local_volume = false;
+	private double _account_service_volume = 0.0;
+	private bool _active_port_headphone = false;
+
+	/** true when connected to the pulse server */
+	public override bool ready { get; private set; }
+
+	/** true when a microphone is active **/
+	public override bool active_mic { get; private set; default = false; }
+
+	/** true when high volume warnings should be shown */
+	public override bool high_volume {
+		get {
+			return this._volume > 0.75 && _active_port_headphone;	
+		}
+	}
+
+	public VolumeControlPulse ()
+	{
+		if (loop == null)
+			loop = new PulseAudio.GLibMainLoop ();
+
+		_mute_cancellable = new Cancellable ();
+		_volume_cancellable = new Cancellable ();
+
+		setup_accountsservice.begin ();
+
+		this.reconnect_to_pulse ();
+	}
+
+	~VolumeControlPulse ()
+	{
+		if (_reconnect_timer != 0) {
+			Source.remove (_reconnect_timer);
+			_reconnect_timer = 0;
+		}
+		stop_local_volume_timer();
+		stop_account_service_volume_timer();
+	}
+
+	/* PulseAudio logic*/
+	private void context_events_cb (Context c, Context.SubscriptionEventType t, uint32 index)
+	{
+		switch (t & Context.SubscriptionEventType.FACILITY_MASK)
+		{
+			case Context.SubscriptionEventType.SINK:
+				update_sink ();
+				break;
+
+			case Context.SubscriptionEventType.SINK_INPUT:
+				switch (t & Context.SubscriptionEventType.TYPE_MASK)
+				{
+					case Context.SubscriptionEventType.NEW:
+						c.get_sink_input_info (index, handle_new_sink_input_cb);
+						break;
+
+					case Context.SubscriptionEventType.CHANGE:
+						c.get_sink_input_info (index, handle_changed_sink_input_cb);
+						break;
+
+					case Context.SubscriptionEventType.REMOVE:
+						remove_sink_input_from_list (index);
+						break;
+					default:
+						debug ("Sink input event not known.");
+						break;
+				}
+				break;
+
+			case Context.SubscriptionEventType.SOURCE:
+				update_source ();
+				break;
+
+			case Context.SubscriptionEventType.SOURCE_OUTPUT:
+				switch (t & Context.SubscriptionEventType.TYPE_MASK)
+				{
+					case Context.SubscriptionEventType.NEW:
+						c.get_source_output_info (index, source_output_info_cb);
+						break;
+
+					case Context.SubscriptionEventType.REMOVE:
+						this.active_mic = false;
+						break;
+				}
+				break;
+		}
+	}
+
+	private void sink_info_cb_for_props (Context c, SinkInfo? i, int eol)
+	{
+		bool old_high_volume = this.high_volume;
+
+		if (i == null)
+			return;
+
+		if (_mute != (bool)i.mute)
+		{
+			_mute = (bool)i.mute;
+			this.notify_property ("mute");
+		}
+
+		var playing = (i.state == PulseAudio.SinkState.RUNNING);
+		if (_is_playing != playing)
+		{
+			_is_playing = playing;
+			this.notify_property ("is-playing");
+		}
+
+		/* Check if the current active port is headset/headphone */
+		/* There is not easy way to check if the port is a headset/headphone besides
+		 * checking for the port name. On touch (with the pulseaudio droid element)
+		 * the headset/headphone port is called 'output-headset' and 'output-headphone'.
+		 * On the desktop this is usually called 'analog-output-headphones' */
+		if (i.active_port != null &&
+			(i.active_port.name == "output-wired_headset" ||
+		 	 i.active_port.name == "output-wired_headphone" ||
+			 i.active_port.name == "analog-output-headphones")) {
+			_active_port_headphone = true;
+		} else {
+			_active_port_headphone = false;
+		}
+
+		if (_pulse_use_stream_restore == false &&
+				_volume != volume_to_double (i.volume.max ()))
+		{
+			_volume = volume_to_double (i.volume.max ());
+			this.notify_property("volume");
+			start_local_volume_timer();
+		} 
+		
+		if (this.high_volume != old_high_volume) {
+			this.notify_property("high-volume");
+		}
+	}
+
+	private void source_info_cb (Context c, SourceInfo? i, int eol)
+	{
+		if (i == null)
+			return;
+
+		if (_mic_volume != volume_to_double (i.volume.values[0]))
+		{
+			_mic_volume = volume_to_double (i.volume.values[0]);
+			this.notify_property ("mic-volume");
+		}
+	}
+
+	private void server_info_cb_for_props (Context c, ServerInfo? i)
+	{
+		if (i == null)
+			return;
+		context.get_sink_info_by_name (i.default_sink_name, sink_info_cb_for_props);
+	}
+
+	private void update_sink ()
+	{
+		context.get_server_info (server_info_cb_for_props);
+	}
+
+	private void update_source_get_server_info_cb (PulseAudio.Context c, PulseAudio.ServerInfo? i) {
+		if (i != null)
+			context.get_source_info_by_name (i.default_source_name, source_info_cb);
+	}
+
+	private void update_source ()
+	{
+		context.get_server_info (update_source_get_server_info_cb);
+	}
+
+	private DBusMessage pulse_dbus_filter (DBusConnection connection, owned DBusMessage message, bool incoming)
+	{
+		if (message.get_message_type () == DBusMessageType.SIGNAL) {
+			string active_role_objp = _objp_role_alert;
+			if (_active_sink_input != -1)
+				active_role_objp = _sink_input_hash.get (_active_sink_input);
+
+			if (message.get_path () == active_role_objp && message.get_member () == "VolumeUpdated") {
+				uint sig_count = 0;
+				lock (_pa_volume_sig_count) {
+					sig_count = _pa_volume_sig_count;
+					if (_pa_volume_sig_count > 0)
+						_pa_volume_sig_count--;
+				}
+
+				/* We only care about signals if our internal count is zero */
+				if (sig_count == 0) {
+					/* Extract volume and make sure it's not a side effect of us setting it */
+					Variant body = message.get_body ();
+					Variant varray = body.get_child_value (0);
+
+					uint32 type = 0, volume = 0;
+					VariantIter iter = varray.iterator ();
+					iter.next ("(uu)", &type, &volume);
+					/* Here we need to compare integer values to avoid rounding issues, so just
+					 * using the volume values used by pulseaudio */
+					PulseAudio.Volume cvolume = double_to_volume (_volume);
+					if (volume != cvolume) {
+						/* Someone else changed the volume for this role, reflect on the indicator */
+						_volume = volume_to_double (volume);
+						this.notify_property("volume");
+						start_local_volume_timer();
+					}
+				}
+			}
+		}
+
+		return message;
+	}
+
+	private async void update_active_sink_input (uint32 index)
+	{
+		if ((index == -1) || (index != _active_sink_input && index in _sink_input_list)) {
+			string sink_input_objp = _objp_role_alert;
+			if (index != -1)
+				sink_input_objp = _sink_input_hash.get (index);
+			_active_sink_input = index;
+
+			/* Listen for role volume changes from pulse itself (external clients) */
+			try {
+				var builder = new VariantBuilder (new VariantType ("ao"));
+				builder.add ("o", sink_input_objp);
+
+				yield _pconn.call ("org.PulseAudio.Core1", "/org/pulseaudio/core1",
+						"org.PulseAudio.Core1", "ListenForSignal",
+						new Variant ("(sao)", "org.PulseAudio.Ext.StreamRestore1.RestoreEntry.VolumeUpdated", builder),
+						null, DBusCallFlags.NONE, -1);
+			} catch (GLib.Error e) {
+				warning ("unable to listen for pulseaudio dbus signals (%s)", e.message);
+			}
+
+			try {
+				var props_variant = yield _pconn.call ("org.PulseAudio.Ext.StreamRestore1.RestoreEntry",
+						sink_input_objp, "org.freedesktop.DBus.Properties", "Get",
+						new Variant ("(ss)", "org.PulseAudio.Ext.StreamRestore1.RestoreEntry", "Volume"),
+						null, DBusCallFlags.NONE, -1);
+				Variant tmp;
+				props_variant.get ("(v)", out tmp);
+				uint32 type = 0, volume = 0;
+				VariantIter iter = tmp.iterator ();
+				iter.next ("(uu)", &type, &volume);
+
+				_volume = volume_to_double (volume);
+				this.notify_property("volume");
+				start_local_volume_timer();
+			} catch (GLib.Error e) {
+				warning ("unable to get volume for active role %s (%s)", sink_input_objp, e.message);
+			}
+		}
+	}
+
+	private void add_sink_input_into_list (SinkInputInfo sink_input)
+	{
+		/* We're only adding ones that are not corked and with a valid role */
+		var role = sink_input.proplist.gets (PulseAudio.Proplist.PROP_MEDIA_ROLE);
+
+		if (role != null && role in _valid_roles) {
+			if (sink_input.corked == 0 || role == "phone") {
+				_sink_input_list.insert (0, sink_input.index);
+				switch (role)
+				{
+					case "multimedia":
+						_sink_input_hash.set (sink_input.index, _objp_role_multimedia);
+						break;
+					case "alert":
+						_sink_input_hash.set (sink_input.index, _objp_role_alert);
+						break;
+					case "alarm":
+						_sink_input_hash.set (sink_input.index, _objp_role_alarm);
+						break;
+					case "phone":
+						_sink_input_hash.set (sink_input.index, _objp_role_phone);
+						break;
+				}
+				/* Only switch the active sink input in case a phone one is not active */
+				if (_active_sink_input == -1 ||
+						_sink_input_hash.get (_active_sink_input) != _objp_role_phone)
+					update_active_sink_input.begin (sink_input.index);
+			}
+		}
+	}
+
+	private void remove_sink_input_from_list (uint32 index)
+	{
+		if (index in _sink_input_list) {
+			_sink_input_list.remove (index);
+			_sink_input_hash.unset (index);
+			if (index == _active_sink_input) {
+				if (_sink_input_list.size != 0)
+					update_active_sink_input.begin (_sink_input_list.get (0));
+				else
+					update_active_sink_input.begin (-1);
+			}
+		}
+	}
+
+	private void handle_new_sink_input_cb (Context c, SinkInputInfo? i, int eol)
+	{
+		if (i == null)
+			return;
+
+		add_sink_input_into_list (i);
+	}
+
+	private void handle_changed_sink_input_cb (Context c, SinkInputInfo? i, int eol)
+	{
+		if (i == null)
+			return;
+
+		if (i.index in _sink_input_list) {
+			/* Phone stream is always corked, so handle it differently */
+			if (i.corked == 1 && _sink_input_hash.get (i.index) != _objp_role_phone)
+				remove_sink_input_from_list (i.index);
+		} else {
+			if (i.corked == 0)
+				add_sink_input_into_list (i);
+		}
+	}
+
+	private void source_output_info_cb (Context c, SourceOutputInfo? i, int eol)
+	{
+		if (i == null)
+			return;
+
+		var role = i.proplist.gets (PulseAudio.Proplist.PROP_MEDIA_ROLE);
+		if (role == "phone" || role == "production")
+			this.active_mic = true;
+	}
+
+	private void context_state_callback (Context c)
+	{
+		switch (c.get_state ()) {
+			case Context.State.READY:
+				if (_pulse_use_stream_restore) {
+					c.subscribe (PulseAudio.Context.SubscriptionMask.SINK |
+							PulseAudio.Context.SubscriptionMask.SINK_INPUT |
+							PulseAudio.Context.SubscriptionMask.SOURCE |
+							PulseAudio.Context.SubscriptionMask.SOURCE_OUTPUT);
+				} else {
+					c.subscribe (PulseAudio.Context.SubscriptionMask.SINK |
+							PulseAudio.Context.SubscriptionMask.SOURCE |
+							PulseAudio.Context.SubscriptionMask.SOURCE_OUTPUT);
+				}
+				c.set_subscribe_callback (context_events_cb);
+				update_sink ();
+				update_source ();
+				this.ready = true;
+				break;
+
+			case Context.State.FAILED:
+			case Context.State.TERMINATED:
+				if (_reconnect_timer == 0)
+					_reconnect_timer = Timeout.add_seconds (2, reconnect_timeout);
+				break;
+
+			default:
+				this.ready = false;
+				break;
+		}
+	}
+
+	bool reconnect_timeout ()
+	{
+		_reconnect_timer = 0;
+		reconnect_to_pulse ();
+		return false; // G_SOURCE_REMOVE
+	}
+
+	void reconnect_to_pulse ()
+	{
+		if (this.ready) {
+			this.context.disconnect ();
+			this.context = null;
+			this.ready = false;
+		}
+
+		var props = new Proplist ();
+		props.sets (Proplist.PROP_APPLICATION_NAME, "Ubuntu Audio Settings");
+		props.sets (Proplist.PROP_APPLICATION_ID, "com.canonical.settings.sound");
+		props.sets (Proplist.PROP_APPLICATION_ICON_NAME, "multimedia-volume-control");
+		props.sets (Proplist.PROP_APPLICATION_VERSION, "0.1");
+
+		reconnect_pulse_dbus ();
+
+		this.context = new PulseAudio.Context (loop.get_api(), null, props);
+		this.context.set_state_callback (context_state_callback);
+
+		if (context.connect(null, Context.Flags.NOFAIL, null) < 0)
+			warning( "pa_context_connect() failed: %s\n", PulseAudio.strerror(context.errno()));
+	}
+
+	void sink_info_list_callback_set_mute (PulseAudio.Context context, PulseAudio.SinkInfo? sink, int eol) {
+		if (sink != null)
+			context.set_sink_mute_by_index (sink.index, true, null);
+	}
+
+	void sink_info_list_callback_unset_mute (PulseAudio.Context context, PulseAudio.SinkInfo? sink, int eol) {
+		if (sink != null)
+			context.set_sink_mute_by_index (sink.index, false, null);
+	}
+
+	/* Mute operations */
+	bool set_mute_internal (bool mute)
+	{
+		return_val_if_fail (context.get_state () == Context.State.READY, false);
+
+		if (_mute != mute) {
+			if (mute)
+				context.get_sink_info_list (sink_info_list_callback_set_mute);
+			else
+				context.get_sink_info_list (sink_info_list_callback_unset_mute);
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	public override void set_mute (bool mute)
+	{
+		if (set_mute_internal (mute))
+			sync_mute_to_accountsservice.begin (mute);
+	}
+
+	public void toggle_mute ()
+	{
+		this.set_mute (!this._mute);
+	}
+
+	public override bool mute
+	{
+		get
+		{
+			return this._mute;
+		}
+	}
+
+	public override bool is_playing
+	{
+		get
+		{
+			return this._is_playing;
+		}
+	}
+
+	/* Volume operations */
+	private static PulseAudio.Volume double_to_volume (double vol)
+	{
+		double tmp = (double)(PulseAudio.Volume.NORM - PulseAudio.Volume.MUTED) * vol;
+		return (PulseAudio.Volume)tmp + PulseAudio.Volume.MUTED;
+	}
+
+	private static double volume_to_double (PulseAudio.Volume vol)
+	{
+		double tmp = (double)(vol - PulseAudio.Volume.MUTED);
+		return tmp / (double)(PulseAudio.Volume.NORM - PulseAudio.Volume.MUTED);
+	}
+
+	private void set_volume_success_cb (Context c, int success)
+	{
+		if ((bool)success)
+			this.notify_property("volume");
+	}
+
+	private void sink_info_set_volume_cb (Context c, SinkInfo? i, int eol)
+	{
+		if (i == null)
+			return;
+
+		unowned CVolume cvol = i.volume;
+		cvol.scale (double_to_volume (_volume));
+		c.set_sink_volume_by_index (i.index, cvol, set_volume_success_cb);
+	}
+
+	private void server_info_cb_for_set_volume (Context c, ServerInfo? i)
+	{
+		if (i == null)
+		{
+			warning ("Could not get PulseAudio server info");
+			return;
+		}
+
+		context.get_sink_info_by_name (i.default_sink_name, sink_info_set_volume_cb);
+	}
+
+	private async void set_volume_active_role ()
+	{
+		string active_role_objp = _objp_role_alert;
+
+		if (_active_sink_input != -1 && _active_sink_input in _sink_input_list)
+			active_role_objp = _sink_input_hash.get (_active_sink_input);
+
+		try {
+			var builder = new VariantBuilder (new VariantType ("a(uu)"));
+			builder.add ("(uu)", 0, double_to_volume (_volume));
+			Variant volume = builder.end ();
+
+			/* Increase the signal counter so we can handle the callback */
+			lock (_pa_volume_sig_count) {
+				_pa_volume_sig_count++;
+			}
+
+			yield _pconn.call ("org.PulseAudio.Ext.StreamRestore1.RestoreEntry",
+					active_role_objp, "org.freedesktop.DBus.Properties", "Set",
+					new Variant ("(ssv)", "org.PulseAudio.Ext.StreamRestore1.RestoreEntry", "Volume", volume),
+					null, DBusCallFlags.NONE, -1);
+
+			this.notify_property("volume");
+		} catch (GLib.Error e) {
+			lock (_pa_volume_sig_count) {
+				_pa_volume_sig_count--;
+			}
+			warning ("unable to set volume for stream obj path %s (%s)", active_role_objp, e.message);
+		}
+	}
+
+	bool set_volume_internal (double volume)
+	{
+		if (context.get_state () != Context.State.READY)
+			return false;
+
+		if (_volume != volume) {
+			var old_high_volume = this.high_volume;
+
+			_volume = volume;
+			if (_pulse_use_stream_restore)
+				set_volume_active_role.begin ();
+			else
+				context.get_server_info (server_info_cb_for_set_volume);
+
+			this.notify_property("volume");
+
+			if (this.high_volume != old_high_volume)
+				this.notify_property("high-volume");
+
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	void set_mic_volume_success_cb (Context c, int success)
+	{
+		if ((bool)success)
+			this.notify_property ("mic-volume");
+	}
+
+	void set_mic_volume_get_server_info_cb (PulseAudio.Context c, PulseAudio.ServerInfo? i) {
+		if (i != null) {
+			unowned CVolume cvol = CVolume ();
+			cvol = vol_set (cvol, 1, double_to_volume (_mic_volume));
+			c.set_source_volume_by_name (i.default_source_name, cvol, set_mic_volume_success_cb);
+		}
+	}
+
+	public override double volume {
+		get {
+			return _volume;
+		}
+		set {
+			if (set_volume_internal (value)) {
+				start_local_volume_timer();
+			}
+		}
+	}
+
+	public override double mic_volume {
+		get {
+			return _mic_volume;
+		}
+		set {
+			return_if_fail (context.get_state () == Context.State.READY);
+
+			_mic_volume = value;
+
+			context.get_server_info (set_mic_volume_get_server_info_cb);
+		}
+	}
+
+	/* PulseAudio Dbus (Stream Restore) logic */
+	private void reconnect_pulse_dbus ()
+	{
+		unowned string pulse_dbus_server_env = Environment.get_variable ("PULSE_DBUS_SERVER");
+		string address;
+
+		/* In case of a reconnect */
+		_pulse_use_stream_restore = false;
+		_pa_volume_sig_count = 0;
+
+		if (pulse_dbus_server_env != null) {
+			address = pulse_dbus_server_env;
+		} else {
+			DBusConnection conn;
+			Variant props;
+
+			try {
+				conn = Bus.get_sync (BusType.SESSION);
+			} catch (GLib.IOError e) {
+				warning ("unable to get the dbus session bus: %s", e.message);
+				return;
+			}
+
+			try {
+				var props_variant = conn.call_sync ("org.PulseAudio1",
+						"/org/pulseaudio/server_lookup1", "org.freedesktop.DBus.Properties",
+						"Get", new Variant ("(ss)", "org.PulseAudio.ServerLookup1", "Address"),
+						null, DBusCallFlags.NONE, -1);
+				props_variant.get ("(v)", out props);
+				address = props.get_string ();
+			} catch (GLib.Error e) {
+				warning ("unable to get pulse unix socket: %s", e.message);
+				return;
+			}
+		}
+
+		stdout.printf ("PulseAudio dbus unix socket: %s\n", address);
+		try {
+			_pconn = new DBusConnection.for_address_sync (address, DBusConnectionFlags.AUTHENTICATION_CLIENT);
+		} catch (GLib.Error e) {
+			/* If it fails, it means the dbus pulse extension is not available */
+			return;
+		}
+
+		/* For pulse dbus related events */
+		_pconn.add_filter (pulse_dbus_filter);
+
+		/* Check if the 4 currently supported media roles are already available in StreamRestore
+		 * Roles: multimedia, alert, alarm and phone */
+		_objp_role_multimedia = stream_restore_get_object_path ("sink-input-by-media-role:multimedia");
+		_objp_role_alert = stream_restore_get_object_path ("sink-input-by-media-role:alert");
+		_objp_role_alarm = stream_restore_get_object_path ("sink-input-by-media-role:alarm");
+		_objp_role_phone = stream_restore_get_object_path ("sink-input-by-media-role:phone");
+
+		/* Only use stream restore if every used role is available */
+		if (_objp_role_multimedia != null && _objp_role_alert != null && _objp_role_alarm != null && _objp_role_phone != null) {
+			stdout.printf ("Using PulseAudio DBUS Stream Restore module\n");
+			/* Restore volume and update default entry */
+			update_active_sink_input.begin (-1);
+			_pulse_use_stream_restore = true;
+		}
+	}
+
+	private string? stream_restore_get_object_path (string name) {
+		string? objp = null;
+		try {
+			Variant props_variant = _pconn.call_sync ("org.PulseAudio.Ext.StreamRestore1",
+					"/org/pulseaudio/stream_restore1", "org.PulseAudio.Ext.StreamRestore1",
+					"GetEntryByName", new Variant ("(s)", name), null, DBusCallFlags.NONE, -1);
+			/* Workaround for older versions of vala that don't provide get_objv */
+			VariantIter iter = props_variant.iterator ();
+			iter.next ("o", &objp);
+			stdout.printf ("Found obj path %s for restore data named %s\n", objp, name);
+		} catch (GLib.Error e) {
+			warning ("unable to find stream restore data for: %s", name);
+		}
+		return objp;
+	}
+
+	/* AccountsService operations */
+	private void accountsservice_props_changed_cb (DBusProxy proxy, Variant changed_properties, string[]? invalidated_properties)
+	{
+		Variant volume_variant = changed_properties.lookup_value ("Volume", new VariantType ("d"));
+		if (volume_variant != null) {
+			var volume = volume_variant.get_double ();
+			if (volume >= 0) {
+				_account_service_volume = volume;
+				// we need to wait for this to settle.
+				start_account_service_volume_timer();
+			}
+		}
+
+		Variant mute_variant = changed_properties.lookup_value ("Muted", new VariantType ("b"));
+		if (mute_variant != null) {
+			var mute = mute_variant.get_boolean ();
+			set_mute_internal (mute);
+		}
+	}
+
+	private async void setup_user_proxy (string? username_in = null)
+	{
+		var username = username_in;
+		_user_proxy = null;
+
+		// Look up currently selected greeter user, if asked
+		if (username == null) {
+			try {
+				username = yield _greeter_proxy.get_active_entry ();
+				if (username == "" || username == null)
+					return;
+			} catch (GLib.Error e) {
+				warning ("unable to find Accounts path for user %s: %s", username, e.message);
+				return;
+			}
+		}
+
+		// Get master AccountsService object
+		DBusProxy accounts_proxy;
+		try {
+			accounts_proxy = yield DBusProxy.create_for_bus (BusType.SYSTEM, DBusProxyFlags.DO_NOT_LOAD_PROPERTIES | DBusProxyFlags.DO_NOT_CONNECT_SIGNALS, null, "org.freedesktop.Accounts", "/org/freedesktop/Accounts", "org.freedesktop.Accounts");
+		} catch (GLib.Error e) {
+			warning ("unable to get greeter proxy: %s", e.message);
+			return;
+		}
+
+		// Find user's AccountsService object
+		try {
+			var user_path_variant = yield accounts_proxy.call ("FindUserByName", new Variant ("(s)", username), DBusCallFlags.NONE, -1);
+			string user_path;
+			user_path_variant.get ("(o)", out user_path);
+			_user_proxy = yield DBusProxy.create_for_bus (BusType.SYSTEM, DBusProxyFlags.GET_INVALIDATED_PROPERTIES, null, "org.freedesktop.Accounts", user_path, "com.ubuntu.AccountsService.Sound");
+		} catch (GLib.Error e) {
+			warning ("unable to find Accounts path for user %s: %s", username, e.message);
+			return;
+		}
+
+		// Get current values and listen for changes
+		_user_proxy.g_properties_changed.connect (accountsservice_props_changed_cb);
+		try {
+			var props_variant = yield _user_proxy.get_connection ().call (_user_proxy.get_name (), _user_proxy.get_object_path (), "org.freedesktop.DBus.Properties", "GetAll", new Variant ("(s)", _user_proxy.get_interface_name ()), null, DBusCallFlags.NONE, -1);
+			Variant props;
+			props_variant.get ("(@a{sv})", out props);
+			accountsservice_props_changed_cb(_user_proxy, props, null);
+		} catch (GLib.Error e) {
+			debug("Unable to get properties for user %s at first try: %s", username, e.message);
+		}
+	}
+
+	private void greeter_user_changed (string username)
+	{
+		setup_user_proxy.begin (username);
+	}
+
+	private async void setup_accountsservice ()
+	{
+		if (Environment.get_variable ("XDG_SESSION_CLASS") == "greeter") {
+			try {
+				_greeter_proxy = yield Bus.get_proxy (BusType.SESSION, "com.canonical.UnityGreeter", "/list");
+			} catch (GLib.Error e) {
+				warning ("unable to get greeter proxy: %s", e.message);
+				return;
+			}
+			_greeter_proxy.entry_selected.connect (greeter_user_changed);
+			yield setup_user_proxy ();
+		} else {
+			// We are in a user session.  We just need our own proxy
+			var username = Environment.get_variable ("USER");
+			if (username != "" && username != null) {
+				yield setup_user_proxy (username);
+			}
+		}
+	}
+
+	private async void sync_mute_to_accountsservice (bool mute)
+	{
+		if (_user_proxy == null)
+			return;
+
+		_mute_cancellable.cancel ();
+		_mute_cancellable.reset ();
+
+		try {
+			yield _user_proxy.get_connection ().call (_user_proxy.get_name (), _user_proxy.get_object_path (), "org.freedesktop.DBus.Properties", "Set", new Variant ("(ssv)", _user_proxy.get_interface_name (), "Muted", new Variant ("b", mute)), null, DBusCallFlags.NONE, -1, _mute_cancellable);
+		} catch (GLib.Error e) {
+			warning ("unable to sync mute to AccountsService: %s", e.message);
+		}
+	}
+
+	private async void sync_volume_to_accountsservice (double volume)
+	{
+		if (_user_proxy == null)
+			return;
+
+		_volume_cancellable.cancel ();
+		_volume_cancellable.reset ();
+
+		try {
+			yield _user_proxy.get_connection ().call (_user_proxy.get_name (), _user_proxy.get_object_path (), "org.freedesktop.DBus.Properties", "Set", new Variant ("(ssv)", _user_proxy.get_interface_name (), "Volume", new Variant ("d", volume)), null, DBusCallFlags.NONE, -1, _volume_cancellable);
+		} catch (GLib.Error e) {
+			warning ("unable to sync volume to AccountsService: %s", e.message);
+		}
+	}
+
+	private void start_local_volume_timer()
+	{
+		// perform a slow sync with the accounts service. max at 1 per second.
+
+		// stop the AS update timer, as since we're going to be setting the volume.
+		stop_account_service_volume_timer();
+
+		if (_local_volume_timer == 0) {
+			sync_volume_to_accountsservice.begin (_volume);
+			_local_volume_timer = Timeout.add_seconds (1, local_volume_changed_timeout);
+		} else {
+			_send_next_local_volume = true;
+		}
+	}
+
+	private void stop_local_volume_timer()
+	{
+		if (_local_volume_timer != 0) {
+			Source.remove (_local_volume_timer);
+			_local_volume_timer = 0;
+		}
+	}
+
+	bool local_volume_changed_timeout()
+	{
+		_local_volume_timer = 0;
+		if (_send_next_local_volume) {
+			_send_next_local_volume = false;
+			start_local_volume_timer ();
+		}
+		return false; // G_SOURCE_REMOVE
+	}
+
+	private void start_account_service_volume_timer()
+	{
+		if (_accountservice_volume_timer == 0) {
+			// If we haven't been messing with local volume recently, apply immediately.
+			if (_local_volume_timer == 0 && !set_volume_internal (_account_service_volume)) {
+				return;
+			}
+			// Else check again in another second if needed.
+			// (if AS is throwing us lots of notifications, we update at most once a second)
+			_accountservice_volume_timer = Timeout.add_seconds (1, accountservice_volume_changed_timeout);
+		}
+	}
+
+	private void stop_account_service_volume_timer()
+	{
+		if (_accountservice_volume_timer != 0) {
+			Source.remove (_accountservice_volume_timer);
+			_accountservice_volume_timer = 0;
+		}
+	}
+
+	bool accountservice_volume_changed_timeout ()
+	{
+		_accountservice_volume_timer = 0;
+		start_account_service_volume_timer ();
+		return false; // G_SOURCE_REMOVE
+	}
+}