path: root/src/indicator-sound.c

/*
A small wrapper utility to load indicators and put them as menu items
into the gnome-panel using it's applet interface.

Copyright 2010 Canonical Ltd.

Authors:
    Conor Curran <conor.curra@canonical.com>
    Ted Gould <ted@canonical.com>

This program is free software: you can redistribute it and/or modify it 
under the terms of the GNU General Public License version 3, as published 
by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranties of 
MERCHANTABILITY, SATISFACTORY QUALITY, 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/>.
*/
#include <math.h>
#include <glib.h>
#include <glib-object.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <libdbusmenu-gtk/menu.h>
#include <libido/idoscalemenuitem.h>

#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-bindings.h>

#include <libindicator/indicator.h>
#include <libindicator/indicator-object.h>
#include <libindicator/indicator-service-manager.h>


#include "dbus-shared-names.h"
#include "sound-service-client.h"
#include "common-defs.h"
#include "sound-service-marshal.h"

// GObject Boiler plate
#define INDICATOR_SOUND_TYPE            (indicator_sound_get_type ())
#define INDICATOR_SOUND(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), INDICATOR_SOUND_TYPE, IndicatorSound))
#define INDICATOR_SOUND_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), INDICATOR_SOUND_TYPE, IndicatorSoundClass))
#define IS_INDICATOR_SOUND(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), INDICATOR_SOUND_TYPE))
#define IS_INDICATOR_SOUND_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), INDICATOR_SOUND_TYPE))
#define INDICATOR_SOUND_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), INDICATOR_SOUND_TYPE, IndicatorSoundClass))

typedef struct _IndicatorSound      IndicatorSound;
typedef struct _IndicatorSoundClass IndicatorSoundClass;

//GObject class struct
struct _IndicatorSoundClass {
	IndicatorObjectClass parent_class;
};

//GObject instance struct
struct _IndicatorSound {
	IndicatorObject parent;
	IndicatorServiceManager *service;
};
// GObject Boiler plate
GType indicator_sound_get_type (void);
INDICATOR_SET_VERSION
INDICATOR_SET_TYPE(INDICATOR_SOUND_TYPE)

// GObject Boiler plate
static void indicator_sound_class_init (IndicatorSoundClass *klass);
static void indicator_sound_init       (IndicatorSound *self);
static void indicator_sound_dispose    (GObject *object);
static void indicator_sound_finalize   (GObject *object);
G_DEFINE_TYPE (IndicatorSound, indicator_sound, INDICATOR_OBJECT_TYPE);

//GTK+ items
static GtkLabel * get_label (IndicatorObject * io);
static GtkImage * get_icon (IndicatorObject * io);
static GtkMenu * get_menu (IndicatorObject * io);
//Slider related
static GtkWidget *volume_slider = NULL;
static gboolean new_slider_item (DbusmenuMenuitem * newitem, DbusmenuMenuitem * parent, DbusmenuClient * client);
static void slider_prop_change_cb (DbusmenuMenuitem * mi, gchar * prop, GValue * value, GtkWidget *widget);
// Alternative callback mechanism, may use this again once ido is updated.
/*static gboolean user_change_value_event_cb(GtkRange *range, GtkScrollType scroll_type, gdouble input_value, gpointer  user_data);*/
static gboolean value_changed_event_cb(GtkRange *range, gpointer user_data);
static gboolean key_press_cb(GtkWidget* widget, GdkEventKey* event, gpointer data);

// DBUS communication
static DBusGProxy *sound_dbus_proxy = NULL;
static void connection_changed (IndicatorServiceManager * sm, gboolean connected, gpointer userdata);
static void catch_signal_sink_input_while_muted(DBusGProxy * proxy, gboolean value, gpointer userdata);
static void catch_signal_sink_volume_update(DBusGProxy * proxy, gdouble volume_percent, gpointer userdata); 
static void catch_signal_sink_mute_update(DBusGProxy *proxy, gboolean mute_value, gpointer userdata);
static void fetch_volume_percent_from_dbus();
static void fetch_mute_value_from_dbus();

/****Volume States 'members' ***/
static void prepare_state_machine();
static void determine_state_from_volume(gdouble volume_percent);
static void update_state(const gint state);
static const gint STATE_MUTED = 0;
static const gint STATE_ZERO = 1;
static const gint STATE_LOW = 2;
static const gint STATE_MEDIUM = 3;
static const gint STATE_HIGH = 4;
static const gint STATE_MUTED_WHILE_INPUT = 5;
static const gint STATE_SINKS_NONE = 5;
static GHashTable *volume_states = NULL;
static GtkImage *speaker_image = NULL;
static GtkWidget* primary_image = NULL;
static gint current_state = 0;
static gint previous_state = 0;
static gdouble initial_volume_percent = 0;
static gboolean initial_mute = FALSE;

static void
indicator_sound_class_init (IndicatorSoundClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	object_class->dispose = indicator_sound_dispose;
	object_class->finalize = indicator_sound_finalize;

	IndicatorObjectClass *io_class = INDICATOR_OBJECT_CLASS(klass);
	io_class->get_label = get_label;
	io_class->get_image = get_icon;
	io_class->get_menu = get_menu;

    dbus_g_object_register_marshaller (_sound_service_marshal_VOID__INT_BOOLEAN,
                                     G_TYPE_NONE,
                                     G_TYPE_INT,
                                     G_TYPE_BOOLEAN,
                                     G_TYPE_INVALID);
	return;
}

static void indicator_sound_init (IndicatorSound *self)
{
	/* Set good defaults */
	self->service = NULL;
	/* Now let's fire these guys up. */
	self->service = indicator_service_manager_new_version(INDICATOR_SOUND_DBUS_NAME, INDICATOR_SOUND_DBUS_VERSION);
	g_signal_connect(G_OBJECT(self->service), INDICATOR_SERVICE_MANAGER_SIGNAL_CONNECTION_CHANGE, G_CALLBACK(connection_changed), self);
    prepare_state_machine();
    return;
}


/*
Prepare states Array.
*/
static void prepare_state_machine()
{
    // TODO we need three more images
    volume_states = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, g_free);
    g_hash_table_insert(volume_states, GINT_TO_POINTER(STATE_MUTED), g_strdup("audio-volume-muted-panel"));
    g_hash_table_insert(volume_states, GINT_TO_POINTER(STATE_ZERO), g_strdup("audio-volume-zero-panel"));
    g_hash_table_insert(volume_states, GINT_TO_POINTER(STATE_LOW), g_strdup("audio-volume-low-panel"));
    g_hash_table_insert(volume_states, GINT_TO_POINTER(STATE_MEDIUM), g_strdup("audio-volume-medium-panel"));
    g_hash_table_insert(volume_states, GINT_TO_POINTER(STATE_HIGH), g_strdup("audio-volume-high-panel"));
    g_hash_table_insert(volume_states, GINT_TO_POINTER(STATE_MUTED_WHILE_INPUT), g_strdup("audio-volume-muted-blocking-panel"));
    g_hash_table_insert(volume_states, GINT_TO_POINTER(STATE_SINKS_NONE), g_strdup("audio-output-none-panel"));
}

static void
connection_changed (IndicatorServiceManager * sm, gboolean connected, gpointer userdata)
{
	if (connected) {
		if (sound_dbus_proxy == NULL) {
			GError * error = NULL;

			DBusGConnection * sbus = dbus_g_bus_get(DBUS_BUS_SESSION, NULL);

			sound_dbus_proxy = dbus_g_proxy_new_for_name_owner(sbus,
														   INDICATOR_SOUND_DBUS_NAME,
														   INDICATOR_SOUND_SERVICE_DBUS_OBJECT,
														   INDICATOR_SOUND_SERVICE_DBUS_INTERFACE,
														   &error);

			if (error != NULL) {
				g_warning("Unable to get status proxy: %s", error->message);
				g_error_free(error);
			}
            g_debug("about to connect to the signals");
			dbus_g_proxy_add_signal(sound_dbus_proxy, SIGNAL_SINK_INPUT_WHILE_MUTED, G_TYPE_BOOLEAN, G_TYPE_INVALID);

			dbus_g_proxy_connect_signal(sound_dbus_proxy, SIGNAL_SINK_INPUT_WHILE_MUTED, G_CALLBACK(catch_signal_sink_input_while_muted), NULL, NULL);
			dbus_g_proxy_add_signal(sound_dbus_proxy, SIGNAL_SINK_VOLUME_UPDATE, G_TYPE_DOUBLE, G_TYPE_INVALID);
			dbus_g_proxy_connect_signal(sound_dbus_proxy, SIGNAL_SINK_VOLUME_UPDATE, G_CALLBACK(catch_signal_sink_volume_update), NULL, NULL);
			dbus_g_proxy_add_signal(sound_dbus_proxy, SIGNAL_SINK_MUTE_UPDATE, G_TYPE_BOOLEAN, G_TYPE_INVALID);
			dbus_g_proxy_connect_signal(sound_dbus_proxy, SIGNAL_SINK_MUTE_UPDATE, G_CALLBACK(catch_signal_sink_mute_update), NULL, NULL);

            // Ensure we are in a coherent state with the service at start up.
            // Preserve ordering!
            fetch_volume_percent_from_dbus();
            fetch_mute_value_from_dbus();
		}

	} else {
        //TODO : will need to handle this scenario
	}

	return;
}

static void fetch_volume_percent_from_dbus()
{
    GError * error = NULL;
    gdouble *volume_percent_input; 
    volume_percent_input = g_new0(gdouble, 1);
    org_ayatana_indicator_sound_get_sink_volume(sound_dbus_proxy, volume_percent_input, &error);
	if (error != NULL) {
		g_warning("Unable to fetch VOLUME at indicator start up: %s", error->message);
		g_error_free(error);
        g_free(volume_percent_input);
        return;
	}
    initial_volume_percent = *volume_percent_input;
    determine_state_from_volume(initial_volume_percent);
    g_free(volume_percent_input);
    g_debug("at the indicator start up and the volume percent returned from dbus method is %f", initial_volume_percent);
}

static void fetch_mute_value_from_dbus()
{
    GError * error = NULL;
    gboolean *mute_input; 
    mute_input = g_new0(gboolean, 1);
    org_ayatana_indicator_sound_get_sink_mute(sound_dbus_proxy, mute_input, &error);
    if (error != NULL) {
	    g_warning("Unable to fetch MUTE at indicator start up: %s", error->message);
	    g_error_free(error);
        g_free(mute_input);
        return;
    }
    initial_mute = *mute_input;
    if (initial_mute == TRUE)
        update_state(STATE_MUTED);
    g_free(mute_input);
    g_debug("at the indicator start up and the MUTE returned from dbus method is %i", initial_mute);
}

static void catch_signal_sink_input_while_muted(DBusGProxy * proxy, gboolean block_value, gpointer userdata)
{
    g_debug("signal caught - sink input while muted with value %i", block_value);
}

static void catch_signal_sink_volume_update(DBusGProxy *proxy, gdouble volume_percent, gpointer userdata)
{
    GtkWidget *slider = ido_scale_menu_item_get_scale((IdoScaleMenuItem*)volume_slider);
    GtkRange *range = (GtkRange*)slider;   
    
    // DEBUG
    gdouble current_value = gtk_range_get_value(range);
    g_debug("SIGNAL- update sink volume - current_value : %f and new value : %f", current_value, volume_percent);
    gtk_range_set_value(range, volume_percent); 
    determine_state_from_volume(volume_percent);
}

static void catch_signal_sink_mute_update(DBusGProxy *proxy, gboolean mute_value, gpointer userdata)
{
    //We can be sure the service won't send a mute signal unless it has changed !
    //UNMUTE's force a volume update therefore icon is updated appropriately => no need for unmute handling here.
    if(mute_value == TRUE)
    {
        update_state(STATE_MUTED);
    }
    g_debug("signal caught - sink mute update with mute value: %i", mute_value);
    gtk_widget_set_sensitive(volume_slider, !mute_value);
}


static void
indicator_sound_dispose (GObject *object)
{
	IndicatorSound * self = INDICATOR_SOUND(object);

	if (self->service != NULL) {
		g_object_unref(G_OBJECT(self->service));
		self->service = NULL;
	}
    g_hash_table_destroy(volume_states);
	G_OBJECT_CLASS (indicator_sound_parent_class)->dispose (object);
	return;
}

static void
indicator_sound_finalize (GObject *object)
{
	G_OBJECT_CLASS (indicator_sound_parent_class)->finalize (object);
	return;
}

static GtkLabel *
get_label (IndicatorObject * io)
{
	return NULL;
}

static GtkImage *
get_icon (IndicatorObject * io)
{
    gchar* current_name = g_hash_table_lookup(volume_states, GINT_TO_POINTER(current_state));
    g_debug("At start-up attempting to set the image to %s", current_name);
	speaker_image = GTK_IMAGE(gtk_image_new_from_icon_name(current_name, GTK_ICON_SIZE_MENU));
	gtk_widget_show(GTK_WIDGET(speaker_image));
	return speaker_image;
}

static void update_state(const gint state)
{
/*    g_debug("update state beginning - previous_state = %i", previous_state);*/

    previous_state = current_state;

/*    g_debug("update state 3rd line - previous_state = %i", previous_state);*/

    current_state = state;
    gchar* image_name = g_hash_table_lookup(volume_states, GINT_TO_POINTER(current_state));
    gtk_image_set_from_icon_name(speaker_image, image_name, GTK_ICON_SIZE_MENU);
}


static void determine_state_from_volume(gdouble volume_percent)
{
/*    g_debug("determine_state_from_volume - previous_state = %i", previous_state);*/

    gint state = previous_state;
    if (volume_percent < 30.0 && volume_percent > 0){
        state = STATE_LOW;
    }
    else if(volume_percent < 70.0 && volume_percent > 30.0){
        state = STATE_MEDIUM;
    }
    else if(volume_percent > 70.0){
        state = STATE_HIGH;
    }
    else if(volume_percent == 0.0){
        state = STATE_ZERO;
    }    
    update_state(state);   
}
 

/* Indicator based function to get the menu for the whole
   applet.  This starts up asking for the parts of the menu
   from the various services. */
static GtkMenu *
get_menu (IndicatorObject * io)
{
    DbusmenuGtkMenu *menu = dbusmenu_gtkmenu_new(INDICATOR_SOUND_DBUS_NAME, INDICATOR_SOUND_DBUS_OBJECT);    
	DbusmenuGtkClient *client = dbusmenu_gtkmenu_get_client(menu);	
    dbusmenu_client_add_type_handler(DBUSMENU_CLIENT(client), DBUSMENU_SLIDER_MENUITEM_TYPE, new_slider_item);

    // register Key-press listening on the menu widget as the slider does not allow this.
    g_signal_connect(menu, "key-press-event", G_CALLBACK(key_press_cb), NULL);         

    return GTK_MENU(menu);
}

/**
new_slider_item:
Create a new dBusMenu Slider item, register the 
**/
static gboolean new_slider_item(DbusmenuMenuitem * newitem, DbusmenuMenuitem * parent, DbusmenuClient * client)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(newitem), FALSE);
	g_return_val_if_fail(DBUSMENU_IS_GTKCLIENT(client), FALSE);
    
    volume_slider = ido_scale_menu_item_new_with_range ("Volume", initial_volume_percent, 0, 100, 0.5);
	g_object_set(volume_slider, "reverse-scroll-events", TRUE, NULL);

    GtkMenuItem *menu_volume_slider = GTK_MENU_ITEM(volume_slider);

	dbusmenu_gtkclient_newitem_base(DBUSMENU_GTKCLIENT(client), newitem, menu_volume_slider, parent);
	g_signal_connect(G_OBJECT(newitem), DBUSMENU_MENUITEM_SIGNAL_PROPERTY_CHANGED, G_CALLBACK(slider_prop_change_cb), volume_slider);
    
    // register slider changes listening on the range
    GtkWidget* slider = ido_scale_menu_item_get_scale((IdoScaleMenuItem*)volume_slider);  
    g_signal_connect(slider, "value-changed", G_CALLBACK(value_changed_event_cb), newitem);     
    // alternative callback mechanism which i could use again at some point.
/*    g_signal_connect(slider, "change-value", G_CALLBACK(user_change_value_event_cb), newitem);     */
    
    // Set images on the ido
    primary_image = ido_scale_menu_item_get_primary_image((IdoScaleMenuItem*)volume_slider);    
    gtk_image_set_from_icon_name(GTK_IMAGE(primary_image), g_hash_table_lookup(volume_states, GINT_TO_POINTER(STATE_ZERO)), GTK_ICON_SIZE_MENU);
    GtkWidget* secondary_image = ido_scale_menu_item_get_secondary_image((IdoScaleMenuItem*)volume_slider);                 
    gtk_image_set_from_icon_name(GTK_IMAGE(secondary_image), g_hash_table_lookup(volume_states, GINT_TO_POINTER(STATE_HIGH)), GTK_ICON_SIZE_MENU);

    gtk_widget_show_all(volume_slider);

	return TRUE;
}

/**
slider_prop_change_cb:
Whenever we have a property change on a DbusmenuMenuitem this will be called. 
**/
static void slider_prop_change_cb (DbusmenuMenuitem * mi, gchar * prop, GValue * value, GtkWidget *widget)
{
    g_debug("slider_prop_change_cb - dodgy updater ");
    g_debug("about to set the slider to %f", g_value_get_double(value));
    GtkWidget* slider = ido_scale_menu_item_get_scale((IdoScaleMenuItem*)volume_slider);
    GtkRange* range = (GtkRange*)slider;       
    gtk_range_set_value(range, g_value_get_double(value));  
	return;
}

/**
value_changed_event_cb:
This callback will get triggered irregardless of whether its a user change or a programmatic change.
**/
static gboolean value_changed_event_cb(GtkRange *range, gpointer user_data)
{
    gdouble current_value =  CLAMP(gtk_range_get_value(range), 0, 100);        
    DbusmenuMenuitem *item = (DbusmenuMenuitem*)user_data;
    GValue value = {0};
    g_value_init(&value, G_TYPE_DOUBLE);
    g_value_set_double(&value, current_value);
    g_debug("Value changed callback - = %f", current_value);
    dbusmenu_menuitem_handle_event (item, "slider_change", &value, 0);  
    // This is not ideal in that the icon ui will update on ui actions and not on actual service feedback.
    // but necessary for now as the server does not send volume update information if the source of change was this ui.
    determine_state_from_volume(current_value);
    return FALSE;
}

/**
key_press_cb:
**/
static gboolean key_press_cb(GtkWidget* widget, GdkEventKey* event, gpointer data)
{
    gboolean digested = FALSE;

    GtkWidget* slider = ido_scale_menu_item_get_scale((IdoScaleMenuItem*)volume_slider);
    GtkRange* range = (GtkRange*)slider;       
    gdouble current_value = gtk_range_get_value(range);  
    gdouble new_value = current_value;
    const gdouble five_percent = 5;
    GtkWidget *menuitem;

    menuitem = gtk_menu_get_active (GTK_MENU (widget));
    g_print (g_type_name (menuitem));

    switch(event->keyval)
        {
        case GDK_Right:
            digested = TRUE;
            if(event->state & GDK_CONTROL_MASK)
            {
                new_value = 100;
            }
            else
            {
                new_value = current_value + five_percent;
            }
            break;
        case GDK_Left:
            digested = TRUE;
            if(event->state & GDK_CONTROL_MASK)
            {
                new_value = 0;
            }
            else
            {
                new_value = current_value - five_percent;                
            }
            break;
        case GDK_plus:
            digested = TRUE;
            new_value = current_value + five_percent;                
            break;
        case GDK_minus:
            digested = TRUE;
            new_value = current_value - five_percent;                
            break;
        default:
            break;
        }    
        
        new_value = CLAMP(new_value, 0, 100);
        if(new_value != current_value && current_state != STATE_MUTED)
        {
            g_debug("Attempting to set the range from the key listener to %f", new_value);        
            gtk_range_set_value(range, new_value);  
        }
    return digested;
}

/**
This callback should only be called when the user actually drags the slider.
Turned off for now in favour of the non descriminating value-changed call back.
Once the grabbing listener is implemented on the slider may revert to using this.
Its another tool for filtering unwanted volume change updates.
**/
/*static gboolean user_change_value_event_cb(GtkRange *range, GtkScrollType scroll_type, gdouble input_value, gpointer  user_data)*/
/*{*/
/*    DbusmenuMenuitem *item = (DbusmenuMenuitem*)user_data;*/
/*    gdouble clamped_input = CLAMP(input_value, 0, 100);*/
/*    GValue value = {0};*/
/*    g_debug("User input on SLIDER - = %f", clamped_input);*/
/*    g_value_init(&value, G_TYPE_DOUBLE);*/
/*    g_value_set_double(&value, clamped_input);*/
/*    dbusmenu_menuitem_handle_event (item, "slider_change", &value, 0);*/
/*    return FALSE;  */
/*} */