fix(source convert):Closes #I3Y1L0

@@ -113,28 +113,17 @@ void taskKeyFunc(void)
 	}
 }
 
-/********************************************************************************
-*							poweron defalt souce								*
-*********************************************************************************/
-
-#define MEDIA_DEFAULT		MEDIA_AUX
-//#define MEDIA_DEFAULT		MEDIA_BT_HCI
-//#define MEDIA_DEFAULT		MEDIA_USB_DEVICE
-
-U8 app_defalt_poweron_souce (void)
-{
-	return MEDIA_DEFAULT;
-}
-
 typedef struct{
 	U32 source_id;
 	void (*source_entry)(void);
 } APP_NAV_SOURCE;
 
+
+//first element in this table use for default source
 const APP_NAV_SOURCE source_table[] = 
 {
-	//{MEDIA_BT_HCI,app_nav_rmt_convert_bt_hci},
-	{MEDIA_AUX,app_nav_rmt_convert_aux},
+	{MEDIA_AUX,app_nav_rmt_convert_aux},	
+	{MEDIA_BT_HCI,app_nav_rmt_convert_bt_hci},
 	{MEDIA_OPTICAL,app_nav_rmt_convert_spdif},
 
 #ifdef USB_HOST_ENABLE
@@ -146,7 +135,7 @@ const APP_NAV_SOURCE source_table[] =
 #endif
 
 #if ( (defined USB_DEV_ENABLE) && (defined USB_SPEAKER) )
-	{MEDIA_USB_SPEAKER, app_nav_rmt_convert_pc_speaker},
+	//{MEDIA_USB_SPEAKER, app_nav_rmt_convert_pc_speaker},
 #endif
 
 //	{MEDIA_OPTICAL,app_nav_rmt_convert_spdif},
@@ -154,6 +143,30 @@ const APP_NAV_SOURCE source_table[] =
 //	{MEDIA_ARC,app_nav_rmt_convert_ARC}
 };
 
+/********************************************************************************
+*							poweron defalt souce								*
+*********************************************************************************/
+
+U8 app_defalt_poweron_souce (void)
+{
+	if (sizeof(source_table) != 0)
+	{
+		return source_table[0].source_id;
+	}
+	else
+	{
+		return MEDIA_AUX;
+	}
+}
+
+/********************************************************************************
+*		This is an empty function, it doesn't do anything						*
+*********************************************************************************/
+void source_entry_null(void)
+{
+
+}
+
 /****************************************************************************************
 *						from current source to get	next souce							*
 *****************************************************************************************/
@@ -161,28 +174,37 @@ void* app_get_next_source_entry (U8 curr_source_id)
 {
 	void *srouce_entry;
 	int i;
-	for (i=0;i<sizeof(source_table)/sizeof(APP_NAV_SOURCE);i++)
+	U16 source_count = sizeof(source_table)/sizeof(APP_NAV_SOURCE);
+
+	if (source_count)
 	{
-		if (curr_source_id == source_table[i].source_id)
+		for (i=0;i<source_count;i++)
 		{
-			break;
+			if (curr_source_id == source_table[i].source_id)
+			{
+				break;
+			}
 		}
-	}
 
-	if (i == sizeof(source_table)/sizeof(APP_NAV_SOURCE)-1)
-	{
-		srouce_entry = source_table[0].source_entry;
-	}
-	else if (i < sizeof(source_table)/sizeof(APP_NAV_SOURCE)-1)
-	{
-		srouce_entry = source_table[i+1].source_entry;
-	}
+		if (i != source_count)
+		{
+			i++;//next source
+			i %= source_count;
+			srouce_entry = source_table[i].source_entry;
+		}
+		else
+		{
+			srouce_entry = source_table[0].source_entry;
+			DBG_Printf("err:current source id:%d is not in source table! return default source id\r\n",curr_source_id);			
+		}
+
+		return srouce_entry;
+	} 
 	else
 	{
-		srouce_entry = source_table[0].source_entry;
-		DBG_Printf("err:current source:%d is not in source table!\r\n",curr_source_id);
+		DBG_Printf("source table is null\r\n");			
+		return source_entry_null;
 	}
-	return srouce_entry;
 }
 
 /****************************************************************************************
@@ -192,24 +214,35 @@ void* app_get_cur_source_entry (U8 curr_source_id)
 {
 	void *srouce_entry;
 	int i;
-	for (i=0;i<sizeof(source_table)/sizeof(APP_NAV_SOURCE);i++)
+	U16 source_count = sizeof(source_table)/sizeof(APP_NAV_SOURCE);
+
+	if (source_count)
 	{
-		if (curr_source_id == source_table[i].source_id)
+		for (i=0;i<source_count;i++)
 		{
-			break;
+			if (curr_source_id == source_table[i].source_id)
+			{
+				break;
+			}
 		}
-	}
 
-	if (i <= sizeof(source_table)/sizeof(APP_NAV_SOURCE)-1)
-	{
-		srouce_entry = source_table[i].source_entry;
-	}
+		if (i != source_count)
+		{
+			srouce_entry = source_table[i].source_entry;
+		}
+		else
+		{
+			srouce_entry = source_table[0].source_entry;
+			DBG_Printf("err:current source id:%d is not in source table! return default source id\r\n",curr_source_id);			
+		}
+
+		return srouce_entry;
+	} 
 	else
 	{
-		srouce_entry = source_table[0].source_entry;
-		DBG_Printf("err:current source:%d is not in source table!\r\n",curr_source_id);
+		DBG_Printf("source table is null\r\n");			
+		return app_nav_rmt_convert_aux;
 	}
-	return srouce_entry;
 }
 
 void app_nav_media_convert(void)
@@ -384,11 +417,13 @@ void app_nav_power_on(void)
 #if 1
 
 	void (*source_entry)(void);
+	#ifdef OPTEK_LINK_ENABLE
 	if ((app_main_data.share_link_role == SL_ROLE_SLAVE) || (app_main_data.share_link_role == SL_ROLE_BT))
 	{
 		source_entry = app_nav_rmt_convert_bt_hci;
 	}
 	else
+	#endif
 	{
 		source_entry = app_get_cur_source_entry (app_main_data.media);
 	}