Update common_audio

Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1

Update notes:

 * Moved src/ to webrtc/ to easily diff against the third_party/webrtc
   in the chromium tree

 * ARM/NEON/MIPS support is not yet hooked up

 * Tests have not been copied

webrtc/modules/interface/module.h

@@ -0,0 +1,70 @@
+/*
+ *  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 MODULES_INTERFACE_MODULE_H_
+#define MODULES_INTERFACE_MODULE_H_
+
+#include <assert.h>
+
+#include "typedefs.h"
+
+namespace webrtc {
+
+class Module {
+ public:
+  // Returns version of the module and its components.
+  virtual int32_t Version(char* version,
+                          uint32_t& remaining_buffer_in_bytes,
+                          uint32_t& position) const = 0;
+
+  // Change the unique identifier of this object.
+  virtual int32_t ChangeUniqueId(const int32_t id) = 0;
+
+  // Returns the number of milliseconds until the module want a worker
+  // thread to call Process.
+  virtual int32_t TimeUntilNextProcess() = 0;
+
+  // Process any pending tasks such as timeouts.
+  virtual int32_t Process() = 0;
+
+ protected:
+  virtual ~Module() {}
+};
+
+// Reference counted version of the module interface.
+class RefCountedModule : public Module {
+ public:
+  // Increase the reference count by one.
+  // Returns the incremented reference count.
+  // TODO(perkj): Make this pure virtual when Chromium have implemented  
+  // reference counting ADM and Video capture module.
+  virtual int32_t AddRef() {
+    assert(!"Not implemented.");
+    return 1;
+  }
+
+  // Decrease the reference count by one.
+  // Returns the decreased reference count.
+  // Returns 0 if the last reference was just released.
+  // When the reference count reach 0 the object will self-destruct.
+  // TODO(perkj): Make this pure virtual when Chromium have implemented  
+  // reference counting ADM and Video capture module.
+  virtual int32_t Release() {
+    assert(!"Not implemented.");
+    return 1;
+  }
+
+ protected:
+  virtual ~RefCountedModule() {}
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_INTERFACE_MODULE_H_