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diff --git a/src/modules/audio_processing/processing_component.h b/src/modules/audio_processing/processing_component.h
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+++ b/src/modules/audio_processing/processing_component.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_PROCESSING_COMPONENT_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_PROCESSING_COMPONENT_H_
+
+#include <vector>
+
+#include "audio_processing.h"
+
+namespace webrtc {
+class AudioProcessingImpl;
+
+class ProcessingComponent {
+ public:
+  explicit ProcessingComponent(const AudioProcessingImpl* apm);
+  virtual ~ProcessingComponent();
+
+  virtual int Initialize();
+  virtual int Destroy();
+  virtual int get_version(char* version, int version_len_bytes) const = 0;
+
+  bool is_component_enabled() const;
+
+ protected:
+  virtual int Configure();
+  int EnableComponent(bool enable);
+  void* handle(int index) const;
+  int num_handles() const;
+
+ private:
+  virtual void* CreateHandle() const = 0;
+  virtual int InitializeHandle(void* handle) const = 0;
+  virtual int ConfigureHandle(void* handle) const = 0;
+  virtual int DestroyHandle(void* handle) const = 0;
+  virtual int num_handles_required() const = 0;
+  virtual int GetHandleError(void* handle) const = 0;
+
+  const AudioProcessingImpl* apm_;
+  std::vector<void*> handles_;
+  bool initialized_;
+  bool enabled_;
+  int num_handles_;
+};
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_PROCESSING_COMPONENT_H__