talk/app/webrtc/objc/avfoundationvideocapturer.h

/*
 * libjingle
 * Copyright 2015 Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 */

#ifndef TALK_APP_WEBRTC_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_
#define TALK_APP_WEBRTC_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_

#include "webrtc/media/base/videocapturer.h"
#include "webrtc/video_frame.h"

#import <AVFoundation/AVFoundation.h>

@class RTCAVFoundationVideoCapturerInternal;

namespace rtc {
class Thread;
} // namespace rtc

namespace webrtc {

class AVFoundationVideoCapturer : public cricket::VideoCapturer,
                                  public rtc::MessageHandler {
 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 sampleBuffer);

  // Handles messages from posts.
  void OnMessage(rtc::Message *msg) override;

 private:
  void OnFrameMessage(CVImageBufferRef image_buffer, int64_t capture_time);

  RTCAVFoundationVideoCapturerInternal* _capturer;
  rtc::Thread* _startThread;  // Set in Start(), unset in Stop().
};  // AVFoundationVideoCapturer

}  // namespace webrtc

#endif  // TALK_APP_WEBRTC_OBJC_AVFOUNDATION_CAPTURER_H_