/* -*- 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 mozilla_VideoEngine_h

#define mozilla_VideoEngine_h

#include "MediaEngine.h"

#include "VideoFrameUtils.h"

#include "mozilla/media/MediaUtils.h"

#include "webrtc/modules/video_capture/video_capture_impl.h"

#include "webrtc/modules/video_capture/video_capture_defines.h"

#include "webrtc/modules/video_capture/video_capture_factory.h"

#include "webrtc/video_engine/desktop_capture_impl.h"

#include <memory>

#include <functional>

namespace mozilla {

namespace camera {

// Historically the video engine was part of webrtc

// it was removed (and reimplemented in Talk)

class VideoEngine

{

private:

  virtual ~VideoEngine (){};

  // Base cache expiration period

  // Note because cameras use HW plug event detection, this

  // only applies to screen based modes.

  static const int64_t kCacheExpiryPeriodMs = 2000;

public:

  VideoEngine() : mId(0) {};

  NS_INLINE_DECL_REFCOUNTING(VideoEngine)

  static already_AddRefed<VideoEngine> Create(UniquePtr<const webrtc::Config>&& aConfig);

#if defined(ANDROID)

  static int SetAndroidObjects();

#endif

  void CreateVideoCapture(int32_t& id, const char* deviceUniqueIdUTF8);

  int ReleaseVideoCapture(const int32_t id);

  // VideoEngine is responsible for any cleanup in its modules

  static void Delete(VideoEngine * engine) { }

  /** Returns an existing or creates a new new DeviceInfo.

  *   Camera info is cached to prevent repeated lengthy polling for "realness"

  *   of the hardware devices.  Other types of capture, e.g. screen share info,

  *   are cached for 1 second. This could be handled in a more elegant way in

  *   the future.

  *   @return on failure the shared_ptr will be null, otherwise it will contain

  *   a DeviceInfo.

  *   @see bug 1305212 https://bugzilla.mozilla.org/show_bug.cgi?id=1305212

  */

  std::shared_ptr<webrtc::VideoCaptureModule::DeviceInfo> GetOrCreateVideoCaptureDeviceInfo();

  const UniquePtr<const webrtc::Config>& GetConfiguration();

  class CaptureEntry {

  public:

    CaptureEntry(int32_t aCapnum,

                 rtc::scoped_refptr<webrtc::VideoCaptureModule> aCapture);

    int32_t Capnum() const;

    rtc::scoped_refptr<webrtc::VideoCaptureModule> VideoCapture();

  private:

    int32_t mCapnum;

    rtc::scoped_refptr<webrtc::VideoCaptureModule> mVideoCaptureModule;

    friend class VideoEngine;

  };

  // Returns true iff an entry for capnum exists

  bool WithEntry(const int32_t entryCapnum, const std::function<void(CaptureEntry &entry)>&& fn);

private:

  explicit VideoEngine(UniquePtr<const webrtc::Config>&& aConfig);

  int32_t mId;

  webrtc::CaptureDeviceInfo mCaptureDevInfo;

  std::shared_ptr<webrtc::VideoCaptureModule::DeviceInfo> mDeviceInfo;

  UniquePtr<const webrtc::Config> mConfig;

  std::map<int32_t, CaptureEntry> mCaps;

  std::map<int32_t, int32_t> mIdMap;

  // The validity period for non-camera capture device infos`

  int64_t mExpiryTimeInMs = 0;

  int32_t GenerateId();

  static int32_t sId;

};

}

}

#endif