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diff --git a/talk/media/devices/v4llookup.h b/talk/media/devices/v4llookup.h
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+/*
+ * libjingle
+ * Copyright 2009 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Author: lexnikitin@google.com (Alexey Nikitin)
+ *
+ * V4LLookup provides basic functionality to work with V2L2 devices in Linux
+ * The functionality is implemented as a class with virtual methods for
+ * the purpose of unit testing.
+ */
+#ifndef TALK_MEDIA_DEVICES_V4LLOOKUP_H_
+#define TALK_MEDIA_DEVICES_V4LLOOKUP_H_
+
+#include <string>
+
+#ifdef LINUX
+namespace cricket {
+class V4LLookup {
+ public:
+  virtual ~V4LLookup() {}
+
+  static bool IsV4L2Device(const std::string& device_path) {
+    return GetV4LLookup()->CheckIsV4L2Device(device_path);
+  }
+
+  static void SetV4LLookup(V4LLookup* v4l_lookup) {
+    v4l_lookup_ = v4l_lookup;
+  }
+
+  static V4LLookup* GetV4LLookup() {
+    if (!v4l_lookup_) {
+      v4l_lookup_ = new V4LLookup();
+    }
+    return v4l_lookup_;
+  }
+
+ protected:
+  static V4LLookup* v4l_lookup_;
+  // Making virtual so it is easier to mock
+  virtual bool CheckIsV4L2Device(const std::string& device_path);
+};
+
+}  // namespace cricket
+
+#endif  // LINUX
+#endif  // TALK_MEDIA_DEVICES_V4LLOOKUP_H_