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diff --git a/indra/newview/llspeakers.h b/indra/newview/llspeakers.h
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+/** 
+ * @file llspeakers.h
+ * @brief Management interface for muting and controlling volume of residents currently speaking
+ *
+ * $LicenseInfo:firstyear=2005&license=viewergpl$
+ * 
+ * Copyright (c) 2005-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLSPEAKERS_H
+#define LL_LLSPEAKERS_H
+
+#include "llevent.h"
+#include "llspeakers.h"
+#include "llvoicechannel.h"
+
+class LLSpeakerMgr;
+
+// data for a given participant in a voice channel
+class LLSpeaker : public LLRefCount, public LLOldEvents::LLObservable, public LLHandleProvider<LLSpeaker>, public boost::signals2::trackable
+{
+public:
+	typedef enum e_speaker_type
+	{
+		SPEAKER_AGENT,
+		SPEAKER_OBJECT,
+		SPEAKER_EXTERNAL	// Speaker that doesn't map to an avatar or object (i.e. PSTN caller in a group)
+	} ESpeakerType;
+
+	typedef enum e_speaker_status
+	{
+		STATUS_SPEAKING,
+		STATUS_HAS_SPOKEN,
+		STATUS_VOICE_ACTIVE,
+		STATUS_TEXT_ONLY,
+		STATUS_NOT_IN_CHANNEL,
+		STATUS_MUTED
+	} ESpeakerStatus;
+
+
+	LLSpeaker(const LLUUID& id, const std::string& name = LLStringUtil::null, const ESpeakerType type = SPEAKER_AGENT);
+	~LLSpeaker() {};
+	void lookupName();
+
+	void onAvatarNameLookup(const LLUUID& id, const std::string& first, const std::string& last, BOOL is_group);
+
+	ESpeakerStatus	mStatus;			// current activity status in speech group
+	F32				mLastSpokeTime;		// timestamp when this speaker last spoke
+	F32				mSpeechVolume;		// current speech amplitude (timea average rms amplitude?)
+	std::string		mDisplayName;		// cache user name for this speaker
+	LLFrameTimer	mActivityTimer;	// time out speakers when they are not part of current voice channel
+	BOOL			mHasSpoken;			// has this speaker said anything this session?
+	BOOL			mHasLeftCurrentCall;	// has this speaker left the current voice call?
+	LLColor4		mDotColor;
+	LLUUID			mID;
+	BOOL			mTyping;
+	S32				mSortIndex;
+	ESpeakerType	mType;
+	BOOL			mIsModerator;
+	BOOL			mModeratorMutedVoice;
+	BOOL			mModeratorMutedText;
+};
+
+class LLSpeakerTextModerationEvent : public LLOldEvents::LLEvent
+{
+public:
+	LLSpeakerTextModerationEvent(LLSpeaker* source);
+	/*virtual*/ LLSD getValue();
+};
+
+class LLSpeakerVoiceModerationEvent : public LLOldEvents::LLEvent
+{
+public:
+	LLSpeakerVoiceModerationEvent(LLSpeaker* source);
+	/*virtual*/ LLSD getValue();
+};
+
+class LLSpeakerListChangeEvent : public LLOldEvents::LLEvent
+{
+public:
+	LLSpeakerListChangeEvent(LLSpeakerMgr* source, const LLUUID& speaker_id);
+	/*virtual*/ LLSD getValue();
+
+private:
+	const LLUUID& mSpeakerID;
+};
+
+class LLSpeakerMgr : public LLOldEvents::LLObservable
+{
+public:
+	LLSpeakerMgr(LLVoiceChannel* channelp);
+	virtual ~LLSpeakerMgr();
+
+	LLPointer<LLSpeaker> findSpeaker(const LLUUID& avatar_id);
+	void update(BOOL resort_ok);
+	void setSpeakerTyping(const LLUUID& speaker_id, BOOL typing);
+	void speakerChatted(const LLUUID& speaker_id);
+	LLPointer<LLSpeaker> setSpeaker(const LLUUID& id, 
+					const std::string& name = LLStringUtil::null, 
+					LLSpeaker::ESpeakerStatus status = LLSpeaker::STATUS_TEXT_ONLY, 
+					LLSpeaker::ESpeakerType = LLSpeaker::SPEAKER_AGENT);
+
+	BOOL isVoiceActive();
+
+	typedef std::vector<LLPointer<LLSpeaker> > speaker_list_t;
+	void getSpeakerList(speaker_list_t* speaker_list, BOOL include_text);
+	LLVoiceChannel* getVoiceChannel() { return mVoiceChannel; }
+	const LLUUID getSessionID();
+
+protected:
+	virtual void updateSpeakerList();
+
+	typedef std::map<LLUUID, LLPointer<LLSpeaker> > speaker_map_t;
+	speaker_map_t		mSpeakers;
+
+	speaker_list_t		mSpeakersSorted;
+	LLFrameTimer		mSpeechTimer;
+	LLVoiceChannel*		mVoiceChannel;
+};
+
+class LLIMSpeakerMgr : public LLSpeakerMgr
+{
+public:
+	LLIMSpeakerMgr(LLVoiceChannel* channel);
+	
+	void updateSpeakers(const LLSD& update);
+	void setSpeakers(const LLSD& speakers);
+protected:
+	virtual void updateSpeakerList();
+};
+
+class LLActiveSpeakerMgr : public LLSpeakerMgr, public LLSingleton<LLActiveSpeakerMgr>
+{
+public:
+	LLActiveSpeakerMgr();
+protected:
+	virtual void updateSpeakerList();
+};
+
+class LLLocalSpeakerMgr : public LLSpeakerMgr, public LLSingleton<LLLocalSpeakerMgr>
+{
+public:
+	LLLocalSpeakerMgr();
+	~LLLocalSpeakerMgr ();
+protected:
+	virtual void updateSpeakerList();
+};
+
+#endif // LL_LLSPEAKERS_H