webrtc_m130/webrtc/sdk/objc/Framework/Classes/Video/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_SDK_OBJC_FRAMEWORK_CLASSES_VIDEO_AVFOUNDATIONVIDEOCAPTURER_H_
#define WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEO_AVFOUNDATIONVIDEOCAPTURER_H_

#import <AVFoundation/AVFoundation.h>

#include "webrtc/api/video/video_frame.h"
#include "webrtc/common_video/include/i420_buffer_pool.h"
#include "webrtc/media/base/videocapturer.h"

@class RTCAVFoundationVideoCapturerInternal;

namespace rtc {
class Thread;
}  // namespace rtc

namespace webrtc {

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;
  }
  bool GetPreferredFourccs(std::vector<uint32_t> *fourccs) override {
    fourccs->push_back(cricket::FOURCC_NV12);
    return true;
  }

  // Returns the active capture session. Calls to the capture session should
  // occur on the RTCDispatcherTypeCaptureSession queue in RTCDispatcher.
  AVCaptureSession* GetCaptureSession();

  // Returns whether the rear-facing camera can be used.
  // e.g. It can't be used because it doesn't exist.
  bool CanUseBackCamera() const;

  // 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);

  // Called to adjust the size of output frames to supplied |width| and
  // |height|. Also drops frames to make the output match |fps|.
  void AdaptOutputFormat(int width, int height, int fps);

 private:
  RTCAVFoundationVideoCapturerInternal *_capturer;
  webrtc::I420BufferPool _buffer_pool;
};  // AVFoundationVideoCapturer

}  // namespace webrtc

#endif  // WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEO_AVFOUNDATIONVIDEOCAPTURER_H_