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diff --git a/src/modules/audio_processing/main/source/voice_detection_impl.h b/src/modules/audio_processing/main/source/voice_detection_impl.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_PROCESSING_MAIN_SOURCE_VOICE_DETECTION_IMPL_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_VOICE_DETECTION_IMPL_H_
+
+#include "audio_processing.h"
+#include "processing_component.h"
+
+namespace webrtc {
+class AudioProcessingImpl;
+class AudioBuffer;
+
+class VoiceDetectionImpl : public VoiceDetection,
+                           public ProcessingComponent {
+ public:
+  explicit VoiceDetectionImpl(const AudioProcessingImpl* apm);
+  virtual ~VoiceDetectionImpl();
+
+  int ProcessCaptureAudio(AudioBuffer* audio);
+
+  // VoiceDetection implementation.
+  virtual bool is_enabled() const;
+
+  // ProcessingComponent implementation.
+  virtual int Initialize();
+  virtual int get_version(char* version, int version_len_bytes) const;
+
+ private:
+  // VoiceDetection implementation.
+  virtual int Enable(bool enable);
+  virtual int set_stream_has_voice(bool has_voice);
+  virtual bool stream_has_voice() const;
+  virtual int set_likelihood(Likelihood likelihood);
+  virtual Likelihood likelihood() const;
+  virtual int set_frame_size_ms(int size);
+  virtual int frame_size_ms() const;
+
+  // ProcessingComponent implementation.
+  virtual void* CreateHandle() const;
+  virtual int InitializeHandle(void* handle) const;
+  virtual int ConfigureHandle(void* handle) const;
+  virtual int DestroyHandle(void* handle) const;
+  virtual int num_handles_required() const;
+  virtual int GetHandleError(void* handle) const;
+
+  const AudioProcessingImpl* apm_;
+  bool stream_has_voice_;
+  bool using_external_vad_;
+  Likelihood likelihood_;
+  int frame_size_ms_;
+  int frame_size_samples_;
+};
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_VOICE_DETECTION_IMPL_H_