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diff --git a/dom/media/autoplay/AutoplayPolicy.h b/dom/media/autoplay/AutoplayPolicy.h
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+++ b/dom/media/autoplay/AutoplayPolicy.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#if !defined(AutoplayPolicy_h_)
+#  define AutoplayPolicy_h_
+
+#  include "mozilla/NotNull.h"
+
+class nsIPrincipal;
+
+namespace mozilla::dom {
+
+class HTMLMediaElement;
+class AudioContext;
+class Document;
+enum class AutoplayPolicy : uint8_t;
+enum class AutoplayPolicyMediaType : uint8_t;
+
+}  // namespace mozilla::dom
+
+namespace mozilla::media {
+/**
+ * AutoplayPolicy is used to manage autoplay logic for all kinds of media,
+ * including MediaElement, Web Audio and Web Speech.
+ *
+ * Autoplay could be disable by setting the pref "media.autoplay.default"
+ * to anything but nsIAutoplay::Allowed. Once user disables autoplay, media
+ * could only be played if one of following conditions is true.
+ * 1) Owner document is activated by user gestures
+ *    We restrict user gestures to "mouse click", "keyboard press" and "touch".
+ * 2) Muted media content or video without audio content.
+ * 3) Document's origin has the "autoplay-media" permission.
+ */
+class AutoplayPolicy {
+ public:
+  // Returns whether a given media element is allowed to play.
+  static bool IsAllowedToPlay(const dom::HTMLMediaElement& aElement);
+
+  // Returns whether a given AudioContext is allowed to play.
+  static bool IsAllowedToPlay(const dom::AudioContext& aContext);
+
+  // Return the value of the autoplay permission for given principal. The return
+  // value can be 0=unknown, 1=allow, 2=block audio, 5=block audio and video.
+  static uint32_t GetSiteAutoplayPermission(nsIPrincipal* aPrincipal);
+
+  // Following methods are used for the internal implementation for the Autoplay
+  // Policy Detection API, the public JS interfaces are in exposed on Navigator.
+  // https://w3c.github.io/autoplay/#autoplay-detection-methods
+  static dom::AutoplayPolicy GetAutoplayPolicy(
+      const dom::HTMLMediaElement& aElement);
+
+  static dom::AutoplayPolicy GetAutoplayPolicy(
+      const dom::AudioContext& aContext);
+
+  static dom::AutoplayPolicy GetAutoplayPolicy(
+      const dom::AutoplayPolicyMediaType& aType, const dom::Document& aDoc);
+};
+
+/**
+ * This class contains helper funtions which could be used in AutoplayPolicy
+ * for determing Telemetry use-only result. They shouldn't represent the final
+ * result of blocking autoplay.
+ */
+class AutoplayPolicyTelemetryUtils {
+ public:
+  // Returns true if a given AudioContext would be allowed to play
+  // if block autoplay was enabled. If this returns false, it means we would
+  // either block or ask for permission.
+  // Note: this is for telemetry purposes, and doesn't check the prefs
+  // which enable/disable block autoplay. Do not use for blocking logic!
+  static bool WouldBeAllowedToPlayIfAutoplayDisabled(
+      const dom::AudioContext& aContext);
+};
+
+}  // namespace mozilla::media
+
+#endif