Move and rename host/cast_video_capture_adapter to protocol/webrtc_video_capture_adapter

The adapter will be used in the protocol layer for WebRTC-based connections.

BUG=547158

Review URL: https://codereview.chromium.org/1472703006

Cr-Commit-Position: refs/heads/master@{#361465}

1 files changed, 79 insertions, 0 deletions

diff --git a/remoting/protocol/webrtc_video_capturer_adapter.h b/remoting/protocol/webrtc_video_capturer_adapter.h
new file mode 100644
index 0000000..9c46178
--- /dev/null
+++ b/remoting/protocol/webrtc_video_capturer_adapter.h
@@ -0,0 +1,79 @@
+// Copyright 2015 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_PROTOCOL_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_
+#define REMOTING_PROTOCOL_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_
+
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "base/timer/timer.h"
+#include "third_party/libjingle/source/talk/media/base/videocapturer.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace webrtc {
+class DesktopFrame;
+}  // namespace webrtc
+
+namespace remoting {
+
+// This class controls the capture of video frames from the desktop and is used
+// to construct a VideoSource as part of the webrtc PeerConnection API.
+// WebrtcVideoCapturerAdapter acts as an adapter between webrtc::DesktopCapturer
+// and the cricket::VideoCapturer interface, which it implements. It is used
+// to construct a cricket::VideoSource for a PeerConnection, to capture frames
+// of the desktop. As indicated in the base implementation, Start() and Stop()
+// should be called on the same thread.
+class WebrtcVideoCapturerAdapter : public cricket::VideoCapturer,
+                                   public webrtc::DesktopCapturer::Callback {
+ public:
+  explicit WebrtcVideoCapturerAdapter(
+      scoped_ptr<webrtc::DesktopCapturer> capturer);
+
+  ~WebrtcVideoCapturerAdapter() override;
+
+  // webrtc::DesktopCapturer::Callback implementation.
+  webrtc::SharedMemory* CreateSharedMemory(size_t size) override;
+  // Converts |frame| to a cricket::CapturedFrame and emits that via
+  // SignalFrameCaptured for the base::VideoCapturer implementation to process.
+  void OnCaptureCompleted(webrtc::DesktopFrame* frame) override;
+
+  // cricket::VideoCapturer implementation.
+  bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
+                            cricket::VideoFormat* best_format) override;
+  cricket::CaptureState Start(
+      const cricket::VideoFormat& capture_format) override;
+  bool Pause(bool pause) override;
+  void Stop() override;
+  bool IsRunning() override;
+  bool IsScreencast() const override;
+  bool GetPreferredFourccs(std::vector<uint32>* fourccs) override;
+
+ private:
+  // Kicks off the next frame capture using |desktop_capturer_|.
+  // The captured frame will be passed to OnCaptureCompleted().
+  void CaptureNextFrame();
+
+  // |thread_checker_| is bound to the peer connection worker thread.
+  base::ThreadChecker thread_checker_;
+
+  // Used to capture frames.
+  scoped_ptr<webrtc::DesktopCapturer> desktop_capturer_;
+
+  // Used to schedule periodic screen captures.
+  scoped_ptr<base::RepeatingTimer> capture_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebrtcVideoCapturerAdapter);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_
+