Copy the (early prototype of) remoting in Chrome into the public tree....

remoting/host/encoder.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_HOST_ENCODER_H_
+#define REMOTING_HOST_ENCODER_H_
+
+#include "base/basictypes.h"
+#include "base/task.h"
+#include "remoting/base/protocol/chromotocol.pb.h"
+#include "remoting/host/capturer.h"
+
+namespace media {
+
+class DataBuffer;
+
+}  // namespace media
+
+namespace remoting {
+
+// A class to perform the task of encoding a continous stream of
+// images.
+// This class operates asynchronously to enable maximum throughput.
+class Encoder {
+ public:
+  virtual ~Encoder() {}
+
+  // Encode an image stored in |input_data|. |dirty_rects| contains
+  // regions of update since last encode.
+  //
+  // If |key_frame| is true, the encoder should not reference
+  // previous encode and encode the full frame.
+  //
+  // When encoded data is available, partial or full |data_available_task|
+  // is called, data can be read from |data| and size is |data_size|.
+  // After the last data available event and encode has completed,
+  // |encode_done| is set to true and |data_available_task| is deleted.
+  //
+  // Note that |input_data| and |stride| are arrays of 3 elements.
+  //
+  // Implementation has to ensure that when |data_available_task| is called
+  // output parameters are stable.
+  virtual void Encode(const DirtyRects& dirty_rects,
+                      const uint8** input_data,
+                      const int* strides,
+                      bool key_frame,
+                      chromotocol_pb::UpdateStreamPacketHeader* header,
+                      scoped_refptr<media::DataBuffer>* output_data,
+                      bool* encode_done,
+                      Task* data_available_task) = 0;
+
+  // Set the dimension of the incoming images. Need to call this before
+  // calling Encode().
+  virtual void SetSize(int width, int height) = 0;
+
+  // Set the pixel format of the incoming images. Need to call this before
+  // calling Encode().
+  virtual void SetPixelFormat(chromotocol_pb::PixelFormat pixel_format) = 0;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_ENCODER_H_