Revert of Remove the old AndroidVideoCapturer stack code.

webrtc/api/androidvideocapturer.h

+/*
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_API_ANDROIDVIDEOCAPTURER_H_
+#define WEBRTC_API_ANDROIDVIDEOCAPTURER_H_
+
+#include <string>
+#include <vector>
+
+#include "webrtc/base/thread_checker.h"
+#include "webrtc/common_video/include/video_frame_buffer.h"
+#include "webrtc/media/base/videocapturer.h"
+
+namespace webrtc {
+
+class AndroidVideoCapturer;
+
+class AndroidVideoCapturerDelegate : public rtc::RefCountInterface {
+ public:
+  virtual ~AndroidVideoCapturerDelegate() {}
+  // Start capturing. The implementation of the delegate must call
+  // AndroidVideoCapturer::OnCapturerStarted with the result of this request.
+  virtual void Start(int width, int height, int framerate,
+                     AndroidVideoCapturer* capturer) = 0;
+
+  // Stops capturing.
+  // The delegate may not call into AndroidVideoCapturer after this call.
+  virtual void Stop() = 0;
+
+  virtual std::vector<cricket::VideoFormat> GetSupportedFormats() = 0;
+};
+
+// Android implementation of cricket::VideoCapturer for use with WebRtc
+// PeerConnection.
+class AndroidVideoCapturer : public cricket::VideoCapturer {
+ public:
+  explicit AndroidVideoCapturer(
+      const rtc::scoped_refptr<AndroidVideoCapturerDelegate>& delegate);
+  virtual ~AndroidVideoCapturer();
+
+  // Called from JNI when the capturer has been started.
+  void OnCapturerStarted(bool success);
+
+  // Called from JNI to request a new video format.
+  void OnOutputFormatRequest(int width, int height, int fps);
+
+  AndroidVideoCapturerDelegate* delegate() { return delegate_.get(); }
+
+  // cricket::VideoCapturer implementation.
+  bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
+                            cricket::VideoFormat* best_format) override;
+
+  // Expose these protected methods as public, to be used by the
+  // AndroidVideoCapturerJni.
+  using VideoCapturer::AdaptFrame;
+  using VideoCapturer::OnFrame;
+
+ private:
+  // cricket::VideoCapturer implementation.
+  // Video frames will be delivered using
+  // cricket::VideoCapturer::SignalFrameCaptured on the thread that calls Start.
+  cricket::CaptureState Start(
+      const cricket::VideoFormat& capture_format) override;
+  void Stop() override;
+  bool IsRunning() override;
+  bool IsScreencast() const override { return false; }
+  bool GetPreferredFourccs(std::vector<uint32_t>* fourccs) override;
+
+  bool running_;
+  rtc::scoped_refptr<AndroidVideoCapturerDelegate> delegate_;
+
+  rtc::ThreadChecker thread_checker_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_ANDROIDVIDEOCAPTURER_H_