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+/** 
+ * @file llspeakingindicatormanager.h
+ * @author Mike Antipov
+ * @brief Interfeace of LLSpeackerIndicator class to be processed depend on avatars are in the same voice channel.
+ * Also register/unregister methods for this class are declared
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLSPEAKINGINDICATORMANAGER_H
+#define LL_LLSPEAKINGINDICATORMANAGER_H
+
+class SpeakingIndicatorManager;
+
+class LLSpeakingIndicator
+{
+public:
+	virtual ~LLSpeakingIndicator(){}
+	virtual void switchIndicator(bool switch_on) = 0;
+
+private:
+	friend class SpeakingIndicatorManager;
+	// Accessors for target voice session UUID.
+	// They are intended to be used only from SpeakingIndicatorManager to ensure target session is 
+	// the same indicator was registered with.
+	void setTargetSessionID(const LLUUID& session_id) { mTargetSessionID = session_id; }
+	const LLUUID& getTargetSessionID() { return mTargetSessionID; }
+
+	/**
+	 * session UUID for which indicator should be shown only.
+	 *		If it is set, registered indicator will be shown only in voice channel
+	 *		which has the same session id (EXT-5562).
+	 */
+	LLUUID mTargetSessionID;
+};
+
+// See EXT-3976.
+namespace LLSpeakingIndicatorManager
+{
+	/**
+	 * Stores passed speaking indicator to control its visibility.
+	 *
+	 * Registered indicator is set visible if an appropriate avatar is in the same voice channel with Agent.
+	 * It ignores instances of Agent's indicator.
+	 *
+	 * @param speaker_id LLUUID of an avatar whose speaker indicator is registered.
+	 * @param speaking_indicator instance of the speaker indicator to be registered.
+	 * @param session_id session UUID for which indicator should be shown only.
+	 *		If this parameter is set registered indicator will be shown only in voice channel
+	 *		which has the same session id (EXT-5562).
+	 */
+	void registerSpeakingIndicator(const LLUUID& speaker_id, LLSpeakingIndicator* const speaking_indicator,
+								   const LLUUID& session_id);
+
+	/**
+	 * Removes passed speaking indicator from observing.
+	 *
+	 * @param speaker_id LLUUID of an avatar whose speaker indicator should be unregistered.
+	 * @param speaking_indicator instance of the speaker indicator to be unregistered.
+	 */
+	void unregisterSpeakingIndicator(const LLUUID& speaker_id, const LLSpeakingIndicator* const speaking_indicator);
+}
+
+#endif // LL_LLSPEAKINGINDICATORMANAGER_H