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diff --git a/webrtc/voice_engine/output_mixer.h b/webrtc/voice_engine/output_mixer.h
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+++ b/webrtc/voice_engine/output_mixer.h
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+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_VOICE_ENGINE_OUTPUT_MIXER_H_
+#define WEBRTC_VOICE_ENGINE_OUTPUT_MIXER_H_
+
+#include "webrtc/common_audio/resampler/include/push_resampler.h"
+#include "webrtc/common_types.h"
+#include "webrtc/modules/audio_conference_mixer/interface/audio_conference_mixer.h"
+#include "webrtc/modules/audio_conference_mixer/interface/audio_conference_mixer_defines.h"
+#include "webrtc/modules/utility/interface/file_recorder.h"
+#include "webrtc/voice_engine/dtmf_inband.h"
+#include "webrtc/voice_engine/level_indicator.h"
+#include "webrtc/voice_engine/voice_engine_defines.h"
+
+namespace webrtc {
+
+class AudioProcessing;
+class CriticalSectionWrapper;
+class FileWrapper;
+class VoEMediaProcess;
+
+namespace voe {
+
+class Statistics;
+
+class OutputMixer : public AudioMixerOutputReceiver,
+                    public FileCallback
+{
+public:
+    static int32_t Create(OutputMixer*& mixer, uint32_t instanceId);
+
+    static void Destroy(OutputMixer*& mixer);
+
+    int32_t SetEngineInformation(Statistics& engineStatistics);
+
+    int32_t SetAudioProcessingModule(
+        AudioProcessing* audioProcessingModule);
+
+    // VoEExternalMedia
+    int RegisterExternalMediaProcessing(
+        VoEMediaProcess& proccess_object);
+
+    int DeRegisterExternalMediaProcessing();
+
+    // VoEDtmf
+    int PlayDtmfTone(uint8_t eventCode, int lengthMs, int attenuationDb);
+
+    int32_t MixActiveChannels();
+
+    int32_t DoOperationsOnCombinedSignal(bool feed_data_to_apm);
+
+    int32_t SetMixabilityStatus(MixerParticipant& participant,
+                                bool mixable);
+
+    int32_t SetAnonymousMixabilityStatus(MixerParticipant& participant,
+                                         bool mixable);
+
+    int GetMixedAudio(int sample_rate_hz, int num_channels,
+                      AudioFrame* audioFrame);
+
+    // VoEVolumeControl
+    int GetSpeechOutputLevel(uint32_t& level);
+
+    int GetSpeechOutputLevelFullRange(uint32_t& level);
+
+    int SetOutputVolumePan(float left, float right);
+
+    int GetOutputVolumePan(float& left, float& right);
+
+    // VoEFile
+    int StartRecordingPlayout(const char* fileName,
+                              const CodecInst* codecInst);
+
+    int StartRecordingPlayout(OutStream* stream,
+                              const CodecInst* codecInst);
+    int StopRecordingPlayout();
+
+    virtual ~OutputMixer();
+
+    // from AudioMixerOutputReceiver
+    virtual void NewMixedAudio(
+        int32_t id,
+        const AudioFrame& generalAudioFrame,
+        const AudioFrame** uniqueAudioFrames,
+        uint32_t size);
+
+    // For file recording
+    void PlayNotification(int32_t id, uint32_t durationMs);
+
+    void RecordNotification(int32_t id, uint32_t durationMs);
+
+    void PlayFileEnded(int32_t id);
+    void RecordFileEnded(int32_t id);
+
+private:
+    OutputMixer(uint32_t instanceId);
+    void APMProcessReverseStream();
+    int InsertInbandDtmfTone();
+
+    // uses
+    Statistics* _engineStatisticsPtr;
+    AudioProcessing* _audioProcessingModulePtr;
+
+    // owns
+    CriticalSectionWrapper& _callbackCritSect;
+    // protect the _outputFileRecorderPtr and _outputFileRecording
+    CriticalSectionWrapper& _fileCritSect;
+    AudioConferenceMixer& _mixerModule;
+    AudioFrame _audioFrame;
+    // Converts mixed audio to the audio device output rate.
+    PushResampler<int16_t> resampler_;
+    // Converts mixed audio to the audio processing rate.
+    PushResampler<int16_t> audioproc_resampler_;
+    AudioLevel _audioLevel;    // measures audio level for the combined signal
+    DtmfInband _dtmfGenerator;
+    int _instanceId;
+    VoEMediaProcess* _externalMediaCallbackPtr;
+    bool _externalMedia;
+    float _panLeft;
+    float _panRight;
+    int _mixingFrequencyHz;
+    FileRecorder* _outputFileRecorderPtr;
+    bool _outputFileRecording;
+};
+
+}  // namespace voe
+
+}  // namespace werbtc
+
+#endif  // VOICE_ENGINE_OUTPUT_MIXER_H_