Implement a dummy host to do capturing and analysis only.

remoting/codec/video_encoder.cc

+// Copyright 2016 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.
+
+#include "remoting/codec/video_encoder.h"
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "remoting/codec/video_encoder_verbatim.h"
+#include "remoting/codec/video_encoder_vpx.h"
+#include "remoting/protocol/session_config.h"
+
+namespace remoting {
+
+std::unique_ptr<VideoEncoder> VideoEncoder::Create(
+    const protocol::SessionConfig& config) {
+  const protocol::ChannelConfig& video_config = config.video_config();
+
+  if (video_config.codec == protocol::ChannelConfig::CODEC_VP8) {
+    return VideoEncoderVpx::CreateForVP8();
+  } else if (video_config.codec == protocol::ChannelConfig::CODEC_VP9) {
+    return VideoEncoderVpx::CreateForVP9();
+  } else if (video_config.codec == protocol::ChannelConfig::CODEC_VERBATIM) {
+    return base::WrapUnique(new VideoEncoderVerbatim());
+  }
+
+  NOTREACHED();

[joedow, 2016/05/03 22:28:29]

Should this include a log to state which values was seen?

something like:
NOTREACHED() << "Unknown code type: " << video_config.codec;

[Hzj_jie, 2016/05/04 02:11:56]

I copied and pasted this logic from ice_connection_to_client.cc, but yes, I can
add log.

+  return nullptr;
+}
+
+}  // namespace remoting