AVFoundation Video Capturer: Remove thread jump when delivering frames

webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.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_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_
 #define WEBRTC_API_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_
 
 #import <AVFoundation/AVFoundation.h>
 
 #include "webrtc/common_video/include/i420_buffer_pool.h"
 #include "webrtc/media/base/videocapturer.h"
 #include "webrtc/video_frame.h"
 
 @class RTCAVFoundationVideoCapturerInternal;
 
 namespace rtc {
 class Thread;
 }  // namespace rtc
 
 namespace webrtc {
 
-class AVFoundationVideoCapturer : public cricket::VideoCapturer,
-                                  public rtc::MessageHandler {
+class AVFoundationVideoCapturer : public cricket::VideoCapturer {
  public:
   AVFoundationVideoCapturer();
   ~AVFoundationVideoCapturer();
 
   cricket::CaptureState Start(const cricket::VideoFormat& format) override;
   void Stop() override;
   bool IsRunning() override;
   bool IsScreencast() const override {
     return false;
   }
@@ skipping 12 matching lines @@
 
   // Switches the camera being used (either front or back).
   void SetUseBackCamera(bool useBackCamera);
   bool GetUseBackCamera() const;
 
   // Converts the sample buffer into a cricket::CapturedFrame and signals the
   // frame for capture.
   void CaptureSampleBuffer(CMSampleBufferRef sample_buffer,
                            webrtc::VideoRotation rotation);
 
-  // Handles messages from posts.
-  void OnMessage(rtc::Message *msg) override;
-
  private:
-  void OnFrameMessage(CVImageBufferRef image_buffer,
-                      webrtc::VideoRotation rotation,
-                      int64_t capture_time_ns);
-
   RTCAVFoundationVideoCapturerInternal *_capturer;
-  rtc::Thread *_startThread;  // Set in Start(), unset in Stop().
   webrtc::I420BufferPool _buffer_pool;
 };  // AVFoundationVideoCapturer
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_