/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et ft=cpp : */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef MEDIAENGINE_REMOTE_VIDEO_SOURCE_H_
#define MEDIAENGINE_REMOTE_VIDEO_SOURCE_H_

#include "prcvar.h"
#include "prthread.h"
#include "nsIThread.h"
#include "nsIRunnable.h"

#include "mozilla/Mutex.h"
#include "mozilla/Monitor.h"
#include "nsCOMPtr.h"
#include "nsThreadUtils.h"
#include "DOMMediaStream.h"
#include "nsDirectoryServiceDefs.h"
#include "nsComponentManagerUtils.h"

// Avoid warnings about redefinition of WARN_UNUSED_RESULT
#include "ipc/IPCMessageUtils.h"
#include "VideoUtils.h"
#include "MediaEngineCameraVideoSource.h"
#include "VideoSegment.h"
#include "AudioSegment.h"
#include "StreamTracks.h"
#include "MediaStreamGraph.h"

#include "MediaEngineWrapper.h"
#include "mozilla/dom/MediaStreamTrackBinding.h"

// Camera Access via IPC
#include "CamerasChild.h"

#include "NullTransport.h"

namespace mozilla {

/**
 * The WebRTC implementation of the MediaEngine interface.
 */
class MediaEngineRemoteVideoSource : public MediaEngineCameraVideoSource,
                                     public camera::FrameRelay
{
  typedef MediaEngineCameraVideoSource Super;
public:
  NS_DECL_THREADSAFE_ISUPPORTS

  // Old ExternalRenderer
  void FrameSizeChange(unsigned int w, unsigned int h) override;
  // ExternalRenderer
  int DeliverFrame(uint8_t* buffer,
                   const camera::VideoFrameProperties& properties) override;

  // MediaEngineCameraVideoSource
  MediaEngineRemoteVideoSource(int aIndex, mozilla::camera::CaptureEngine aCapEngine,
                               dom::MediaSourceEnum aMediaSource,
                               bool aScary = false,
                               const char* aMonitorName = "RemoteVideo.Monitor");

  nsresult Allocate(const dom::MediaTrackConstraints& aConstraints,
                    const MediaEnginePrefs& aPrefs,
                    const nsString& aDeviceId,
                    const mozilla::ipc::PrincipalInfo& aPrincipalInfo,
                    AllocationHandle** aOutHandle,
                    const char** aOutBadConstraint) override;
  nsresult Deallocate(AllocationHandle* aHandle) override;
  nsresult Start(SourceMediaStream*, TrackID, const PrincipalHandle&) override;
  nsresult Stop(SourceMediaStream*, TrackID) override;
  nsresult Restart(AllocationHandle* aHandle,
                   const dom::MediaTrackConstraints& aConstraints,
                   const MediaEnginePrefs &aPrefs,
                   const nsString& aDeviceId,
                   const char** aOutBadConstraint) override;
  void NotifyPull(MediaStreamGraph* aGraph,
                  SourceMediaStream* aSource,
                  TrackID aId,
                  StreamTime aDesiredTime,
                  const PrincipalHandle& aPrincipalHandle) override;
  dom::MediaSourceEnum GetMediaSource() const override {
    return mMediaSource;
  }

  bool ChooseCapability(
    const NormalizedConstraints &aConstraints,
    const MediaEnginePrefs &aPrefs,
    const nsString& aDeviceId,
    webrtc::CaptureCapability& aCapability,
    const DistanceCalculation aCalculate) override;

  void Refresh(int aIndex);

  void Shutdown() override;

  bool GetScary() const override { return mScary; }

protected:
  ~MediaEngineRemoteVideoSource() { }

private:
  // Initialize the needed Video engine interfaces.
  void Init();
  size_t NumCapabilities() const override;
  void GetCapability(size_t aIndex, webrtc::CaptureCapability& aOut) const override;
  void SetLastCapability(const webrtc::CaptureCapability& aCapability);

  nsresult
  UpdateSingleSource(const AllocationHandle* aHandle,
                     const NormalizedConstraints& aNetConstraints,
                     const NormalizedConstraints& aNewConstraint,
                     const MediaEnginePrefs& aPrefs,
                     const nsString& aDeviceId,
                     const char** aOutBadConstraint) override;

  dom::MediaSourceEnum mMediaSource; // source of media (camera | application | screen)
  mozilla::camera::CaptureEngine mCapEngine;

  // To only restart camera when needed, we keep track previous settings.
  webrtc::CaptureCapability mLastCapability;
  bool mScary;
};

}

#endif /* MEDIAENGINE_REMOTE_VIDEO_SOURCE_H_ */