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diff --git a/webrtc/modules/audio_conference_mixer/include/audio_conference_mixer.h b/webrtc/modules/audio_conference_mixer/include/audio_conference_mixer.h
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+/*
+ *  Copyright (c) 2011 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_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_H_
+#define WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_H_
+
+#include "webrtc/modules/audio_conference_mixer/include/audio_conference_mixer_defines.h"
+#include "webrtc/modules/include/module.h"
+#include "webrtc/modules/include/module_common_types.h"
+
+namespace webrtc {
+class AudioMixerOutputReceiver;
+class MixerParticipant;
+class Trace;
+
+class AudioConferenceMixer : public Module
+{
+public:
+    enum {kMaximumAmountOfMixedParticipants = 3};
+    enum Frequency
+    {
+        kNbInHz           = 8000,
+        kWbInHz           = 16000,
+        kSwbInHz          = 32000,
+        kFbInHz           = 48000,
+        kLowestPossible   = -1,
+        kDefaultFrequency = kWbInHz
+    };
+
+    // Factory method. Constructor disabled.
+    static AudioConferenceMixer* Create(int id);
+    virtual ~AudioConferenceMixer() {}
+
+    // Module functions
+    int64_t TimeUntilNextProcess() override = 0;
+    int32_t Process() override = 0;
+
+    // Register/unregister a callback class for receiving the mixed audio.
+    virtual int32_t RegisterMixedStreamCallback(
+        AudioMixerOutputReceiver* receiver) = 0;
+    virtual int32_t UnRegisterMixedStreamCallback() = 0;
+
+    // Add/remove participants as candidates for mixing.
+    virtual int32_t SetMixabilityStatus(MixerParticipant* participant,
+                                        bool mixable) = 0;
+    // Returns true if a participant is a candidate for mixing.
+    virtual bool MixabilityStatus(
+        const MixerParticipant& participant) const = 0;
+
+    // Inform the mixer that the participant should always be mixed and not
+    // count toward the number of mixed participants. Note that a participant
+    // must have been added to the mixer (by calling SetMixabilityStatus())
+    // before this function can be successfully called.
+    virtual int32_t SetAnonymousMixabilityStatus(
+        MixerParticipant* participant, bool mixable) = 0;
+    // Returns true if the participant is mixed anonymously.
+    virtual bool AnonymousMixabilityStatus(
+        const MixerParticipant& participant) const = 0;
+
+    // Set the minimum sampling frequency at which to mix. The mixing algorithm
+    // may still choose to mix at a higher samling frequency to avoid
+    // downsampling of audio contributing to the mixed audio.
+    virtual int32_t SetMinimumMixingFrequency(Frequency freq) = 0;
+
+protected:
+    AudioConferenceMixer() {}
+};
+}  // namespace webrtc
+
+#endif // WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_H_