Ungrab volume keys when music playback is active

As there is no direct music playback is active information available,
heuristics based on volume limit audio policy decisions are used.

Based on that the volume keys are ungrabbed even if display is off or
ui is locked.

Also parsing of audio routing was changed, now all sink devices that
have name like "xxxforcall" are considered the same as "xxx". This
should make headset detection work the same whether "forcall" type
sinks are needed in the device or not.

[mce] Ungrab volume keys when music playback is active

mce.c

@@ -1012,6 +1012,8 @@ int main(int argc, char **argv)
 		       0, GINT_TO_POINTER(FALSE));
 	setup_datapipe(&keypad_grab_active_pipe, READ_ONLY, DONT_FREE_CACHE,
 		       0, GINT_TO_POINTER(FALSE));
+	setup_datapipe(&music_playback_pipe, READ_ONLY, DONT_FREE_CACHE,
+		       0, GINT_TO_POINTER(FALSE));
 	/* Initialise mode management
 	 * pre-requisite: mce_gconf_init()
 	 * pre-requisite: mce_dbus_init()
@@ -1144,6 +1146,7 @@ int main(int argc, char **argv)
 	free_datapipe(&touch_grab_wanted_pipe);
 	free_datapipe(&keypad_grab_active_pipe);
 	free_datapipe(&keypad_grab_wanted_pipe);
+	free_datapipe(&music_playback_pipe);
 
 	/* Call the exit function for all subsystems */
 	mce_gconf_exit();

mce.h

@@ -371,6 +371,9 @@ datapipe_struct keypad_grab_wanted_pipe;
 /** keypad input grab active; read only */
 datapipe_struct keypad_grab_active_pipe;
 
+/** music playback active; read only */
+datapipe_struct music_playback_pipe;
+
 /* XXX: use HAL */
 /** Does the device have a flicker key? */
 extern gboolean has_flicker_key;