Add in a new FrameConsumer interface, Decode API, and a RectangleUpdateDecoder abstraction.

remoting/client/rectangle_update_decoder.h

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H
+#define REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H
+
+#include "base/scoped_ptr.h"
+#include "base/task.h"
+#include "media/base/video_frame.h"
+#include "remoting/base/decoder.h"  // For UpdatedRects.
+
+class MessageLoop;
+
+namespace remoting {
+
+class FrameConsumer;
+class RectangleFormat;
+class RectangleUpdatePacket;
+
+// TODO(ajwong): Re-examine this API, especially with regards to how error
+// conditions on each step are reported.  Should they be CHECKs? Logs? Other?
+class RectangleUpdateDecoder {
+ public:
+  RectangleUpdateDecoder(MessageLoop* message_loop,
+                         FrameConsumer* consumer);
+  ~RectangleUpdateDecoder();
+
+  // Decodes the contents of |packet| calling OnPartialFrameOutput() in the
+  // regsitered as data is avaialable. DecodePacket may keep a reference to
+  // |packet| so the |packet| must remain alive and valid until |done| is
+  // executed.
+  //
+  // TODO(ajwong): Should packet be a const pointer to make the lifetime
+  // more clear?
+  void DecodePacket(const RectangleUpdatePacket& packet, Task* done);
+
+ private:
+  static bool IsValidPacket(const RectangleUpdatePacket& packet);
+
+  void InitializeDecoder(const RectangleFormat& format, Task* done);
+
+  void ProcessPacketData(const RectangleUpdatePacket& packet, Task* done);
+
+  // Pointers to infrastructure objects.  Not owned.
+  MessageLoop* message_loop_;
+  FrameConsumer* consumer_;
+
+  scoped_ptr<Decoder> decoder_;
+  UpdatedRects updated_rects_;
+
+  // Framebuffer for the decoder.
+  scoped_refptr<media::VideoFrame> frame_;
+};
+
+}  // namespace remoting
+
+DISABLE_RUNNABLE_METHOD_REFCOUNT(remoting::RectangleUpdateDecoder);
+
+#endif  // REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H