1 files changed, 118 insertions, 0 deletions
diff --git a/dom/media/systemservices/VideoEngine.h b/dom/media/systemservices/VideoEngine.h
new file mode 100644
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+++ b/dom/media/systemservices/VideoEngine.h
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+/* -*- 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 "modules/video_capture/video_capture_impl.h"
+#include "modules/video_capture/video_capture_defines.h"
+#include "modules/video_capture/video_capture_factory.h"
+#include <memory>
+#include <functional>
+
+namespace mozilla::camera {
+
+enum class CaptureDeviceType { Camera, Screen, Window, Browser };
+
+struct CaptureDeviceInfo {
+  CaptureDeviceType type;
+
+  CaptureDeviceInfo() : type(CaptureDeviceType::Camera) {}
+  explicit CaptureDeviceInfo(CaptureDeviceType t) : type(t) {}
+
+  const char* TypeName() const {
+    switch (type) {
+      case CaptureDeviceType::Camera: {
+        return "Camera";
+      }
+      case CaptureDeviceType::Screen: {
+        return "Screen";
+      }
+      case CaptureDeviceType::Window: {
+        return "Window";
+      }
+      case CaptureDeviceType::Browser: {
+        return "Browser";
+      }
+    }
+    assert(false);
+    return "UNKOWN-CaptureDeviceType!";
+  }
+};
+
+// Historically the video engine was part of webrtc
+// it was removed (and reimplemented in Talk)
+class VideoEngine {
+ private:
+  virtual ~VideoEngine() = default;
+
+  // 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(
+      const CaptureDeviceType& aCaptureDeviceType);
+#if defined(ANDROID)
+  static int SetAndroidObjects();
+#endif
+  // Returns a non-negative capture identifier or -1 on failure.
+  int32_t CreateVideoCapture(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();
+
+  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(const CaptureDeviceType& aCaptureDeviceType);
+  int32_t mId;
+  CaptureDeviceInfo mCaptureDevInfo;
+  std::shared_ptr<webrtc::VideoCaptureModule::DeviceInfo> mDeviceInfo;
+  std::map<int32_t, CaptureEntry> mCaps;
+  std::map<int32_t, int32_t> mIdMap;
+  // The validity period for non-camera capture device infos`
+  webrtc::Timestamp mExpiryTime = webrtc::Timestamp::Micros(0);
+  int32_t GenerateId();
+};
+}  // namespace mozilla::camera
+#endif