Implement a dummy host to do capturing and analysis only.

remoting/codec/video_encoder.h

 // Copyright (c) 2012 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_CODEC_VIDEO_ENCODER_H_
 #define REMOTING_CODEC_VIDEO_ENCODER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 namespace webrtc {
 class DesktopFrame;
 }  // namespace webrtc
 
 namespace remoting {
-
+namespace protocol {
+class SessionConfig;
+}  // namespace protocol
 class VideoPacket;
 
 // A class to perform the task of encoding a continuous stream of images. The
 // interface is asynchronous to enable maximum throughput.
 class VideoEncoder {
  public:
   enum Flags { REQUEST_KEY_FRAME = 1 << 0 };
   virtual ~VideoEncoder() {}
 
   // Request that the encoder provide lossless encoding, or color, if possible.
   virtual void SetLosslessEncode(bool want_lossless) {}
   virtual void SetLosslessColor(bool want_lossless) {}
 
   // Encode an image stored in |frame|. If |frame.updated_region()| is empty
   // then the encoder may return a packet (e.g. to top-off previously-encoded
   // portions of the frame to higher quality) or return nullptr to indicate that
   // there is no work to do.
   virtual std::unique_ptr<VideoPacket> Encode(const webrtc::DesktopFrame& frame,
                                               uint32_t flags) = 0;
+
+  static std::unique_ptr<VideoEncoder> Create(
+      const protocol::SessionConfig& config);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CODEC_VIDEO_ENCODER_H_