talk/media/webrtc/webrtcvideocapturer.h

// libjingle
// Copyright 2004 Google Inc.
//
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// modification, are permitted provided that the following conditions are met:
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#ifndef TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
#define TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_

#ifdef HAVE_WEBRTC_VIDEO

#include <string>
#include <vector>

#include "talk/media/base/videocapturer.h"
#include "talk/media/webrtc/webrtcvideoframe.h"
#include "webrtc/base/criticalsection.h"
#include "webrtc/base/messagehandler.h"
#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
#include "webrtc/modules/video_capture/include/video_capture.h"

namespace cricket {

// Factory to allow injection of a VCM impl into WebRtcVideoCapturer.
// DeviceInfos do not have a Release() and therefore need an explicit Destroy().
class WebRtcVcmFactoryInterface {
 public:
  virtual ~WebRtcVcmFactoryInterface() {}
  virtual webrtc::VideoCaptureModule* Create(
      int id, const char* device) = 0;
  virtual webrtc::VideoCaptureModule::DeviceInfo* CreateDeviceInfo(int id) = 0;
  virtual void DestroyDeviceInfo(
      webrtc::VideoCaptureModule::DeviceInfo* info) = 0;
};

// WebRTC-based implementation of VideoCapturer.
class WebRtcVideoCapturer : public VideoCapturer,
                            public webrtc::VideoCaptureDataCallback {
 public:
  WebRtcVideoCapturer();
  explicit WebRtcVideoCapturer(WebRtcVcmFactoryInterface* factory);
  virtual ~WebRtcVideoCapturer();

  bool Init(const Device& device);
  bool Init(webrtc::VideoCaptureModule* module);

  // Override virtual methods of the parent class VideoCapturer.
  virtual bool GetBestCaptureFormat(const VideoFormat& desired,
                                    VideoFormat* best_format);
  virtual CaptureState Start(const VideoFormat& capture_format);
  virtual void Stop();
  virtual bool IsRunning();
  virtual bool IsScreencast() const { return false; }

 protected:
  // Override virtual methods of the parent class VideoCapturer.
  virtual bool GetPreferredFourccs(std::vector<uint32>* fourccs);

 private:
  // Callback when a frame is captured by camera.
  virtual void OnIncomingCapturedFrame(const int32_t id,
                                       webrtc::I420VideoFrame& frame);
  virtual void OnIncomingCapturedEncodedFrame(const int32_t id,
      webrtc::VideoFrame& frame,
      webrtc::VideoCodecType codec_type) {
  }
  virtual void OnCaptureDelayChanged(const int32_t id,
                                     const int32_t delay);

  rtc::scoped_ptr<WebRtcVcmFactoryInterface> factory_;
  webrtc::VideoCaptureModule* module_;
  int captured_frames_;
  std::vector<uint8_t> capture_buffer_;

  // Critical section to avoid Stop during an OnIncomingCapturedFrame callback.
  rtc::CriticalSection critical_section_stopping_;
};

struct WebRtcCapturedFrame : public CapturedFrame {
 public:
  WebRtcCapturedFrame(const webrtc::I420VideoFrame& frame,
                      void* buffer, int length);
};

}  // namespace cricket

#endif  // HAVE_WEBRTC_VIDEO
#endif  // TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_