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* Copyright 2005--2008, Google Inc.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Class to collect statistics from a media channel
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#ifndef TALK_SESSION_PHONE_MEDIAMONITOR_H_
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#define TALK_SESSION_PHONE_MEDIAMONITOR_H_
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#include "talk/base/thread.h"
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#include "talk/base/sigslot.h"
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#include "talk/base/criticalsection.h"
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#include "talk/session/phone/mediachannel.h"
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// The base MediaMonitor class, independent of voice and video.
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class MediaMonitor : public talk_base::MessageHandler,
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public sigslot::has_slots<> {
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MediaMonitor(talk_base::Thread* worker_thread,
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talk_base::Thread* monitor_thread);
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void Start(uint32 milliseconds);
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void OnMessage(talk_base::Message *message);
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void PollMediaChannel();
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virtual void GetStats() = 0;
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virtual void Update() = 0;
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talk_base::CriticalSection crit_;
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talk_base::Thread* worker_thread_;
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talk_base::Thread* monitor_thread_;
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// Templatized MediaMonitor that can deal with different kinds of media.
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template<class MC, class MI>
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class MediaMonitorT : public MediaMonitor {
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MediaMonitorT(MC* media_channel, talk_base::Thread* worker_thread,
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talk_base::Thread* monitor_thread)
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: MediaMonitor(worker_thread, monitor_thread),
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media_channel_(media_channel) {}
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sigslot::signal2<MC*, const MI&> SignalUpdate;
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// These routines assume the crit_ lock is held by the calling thread.
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virtual void GetStats() {
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media_channel_->GetStats(&media_info_);
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virtual void Update() {
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MI stats(media_info_);
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SignalUpdate(media_channel_, stats);
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typedef MediaMonitorT<VoiceMediaChannel, VoiceMediaInfo> VoiceMediaMonitor;
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typedef MediaMonitorT<VideoMediaChannel, VideoMediaInfo> VideoMediaMonitor;
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typedef MediaMonitorT<DataMediaChannel, DataMediaInfo> DataMediaMonitor;
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} // namespace cricket
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#endif // TALK_SESSION_PHONE_MEDIAMONITOR_H_