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diff --git a/dom/media/eme/KeySystemConfig.h b/dom/media/eme/KeySystemConfig.h
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+++ b/dom/media/eme/KeySystemConfig.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/. */
+
+#ifndef DOM_MEDIA_EME_KEYSYSTEMCONFIG_H_
+#define DOM_MEDIA_EME_KEYSYSTEMCONFIG_H_
+
+#include "nsString.h"
+#include "nsTArray.h"
+#include "mozilla/dom/MediaKeysBinding.h"
+
+namespace mozilla {
+
+struct KeySystemConfig {
+ public:
+  // EME MediaKeysRequirement:
+  // https://www.w3.org/TR/encrypted-media/#dom-mediakeysrequirement
+  enum class Requirement {
+    Required = 1,
+    Optional = 2,
+    NotAllowed = 3,
+  };
+
+  // EME MediaKeySessionType:
+  // https://www.w3.org/TR/encrypted-media/#dom-mediakeysessiontype
+  enum class SessionType {
+    Temporary = 1,
+    PersistentLicense = 2,
+  };
+
+  using EMECodecString = nsCString;
+  static constexpr auto EME_CODEC_AAC = "aac"_ns;
+  static constexpr auto EME_CODEC_OPUS = "opus"_ns;
+  static constexpr auto EME_CODEC_VORBIS = "vorbis"_ns;
+  static constexpr auto EME_CODEC_FLAC = "flac"_ns;
+  static constexpr auto EME_CODEC_H264 = "h264"_ns;
+  static constexpr auto EME_CODEC_VP8 = "vp8"_ns;
+  static constexpr auto EME_CODEC_VP9 = "vp9"_ns;
+
+  using EMEEncryptionSchemeString = nsCString;
+  static constexpr auto EME_ENCRYPTION_SCHEME_CENC = "cenc"_ns;
+  static constexpr auto EME_ENCRYPTION_SCHEME_CBCS = "cbcs"_ns;
+
+  // A codec can be decrypted-and-decoded by the CDM, or only decrypted
+  // by the CDM and decoded by Gecko. Not both.
+  struct ContainerSupport {
+    ContainerSupport() = default;
+    ~ContainerSupport() = default;
+    ContainerSupport(const ContainerSupport& aOther) {
+      mCodecsDecoded = aOther.mCodecsDecoded.Clone();
+      mCodecsDecrypted = aOther.mCodecsDecrypted.Clone();
+    }
+    ContainerSupport& operator=(const ContainerSupport& aOther) {
+      if (this == &aOther) {
+        return *this;
+      }
+      mCodecsDecoded = aOther.mCodecsDecoded.Clone();
+      mCodecsDecrypted = aOther.mCodecsDecrypted.Clone();
+      return *this;
+    }
+    ContainerSupport(ContainerSupport&& aOther) = default;
+    ContainerSupport& operator=(ContainerSupport&&) = default;
+
+    bool IsSupported() const {
+      return !mCodecsDecoded.IsEmpty() || !mCodecsDecrypted.IsEmpty();
+    }
+
+    // CDM decrypts and decodes using a DRM robust decoder, and passes decoded
+    // samples back to Gecko for rendering.
+    bool DecryptsAndDecodes(const EMECodecString& aCodec) const {
+      return mCodecsDecoded.Contains(aCodec);
+    }
+
+    // CDM decrypts and passes the decrypted samples back to Gecko for decoding.
+    bool Decrypts(const EMECodecString& aCodec) const {
+      return mCodecsDecrypted.Contains(aCodec);
+    }
+
+    void SetCanDecryptAndDecode(const EMECodecString& aCodec) {
+      // Can't both decrypt and decrypt-and-decode a codec.
+      MOZ_ASSERT(!Decrypts(aCodec));
+      // Prevent duplicates.
+      MOZ_ASSERT(!DecryptsAndDecodes(aCodec));
+      mCodecsDecoded.AppendElement(aCodec);
+    }
+
+    void SetCanDecrypt(const EMECodecString& aCodec) {
+      // Prevent duplicates.
+      MOZ_ASSERT(!Decrypts(aCodec));
+      // Can't both decrypt and decrypt-and-decode a codec.
+      MOZ_ASSERT(!DecryptsAndDecodes(aCodec));
+      mCodecsDecrypted.AppendElement(aCodec);
+    }
+
+   private:
+    nsTArray<EMECodecString> mCodecsDecoded;
+    nsTArray<EMECodecString> mCodecsDecrypted;
+  };
+
+  static bool Supports(const nsAString& aKeySystem);
+  static bool GetConfig(const nsAString& aKeySystem, KeySystemConfig& aConfig);
+
+  KeySystemConfig() = default;
+  ~KeySystemConfig() = default;
+  explicit KeySystemConfig(const KeySystemConfig& aOther) {
+    mKeySystem = aOther.mKeySystem;
+    mInitDataTypes = aOther.mInitDataTypes.Clone();
+    mPersistentState = aOther.mPersistentState;
+    mDistinctiveIdentifier = aOther.mDistinctiveIdentifier;
+    mSessionTypes = aOther.mSessionTypes.Clone();
+    mVideoRobustness = aOther.mVideoRobustness.Clone();
+    mAudioRobustness = aOther.mAudioRobustness.Clone();
+    mEncryptionSchemes = aOther.mEncryptionSchemes.Clone();
+    mMP4 = aOther.mMP4;
+    mWebM = aOther.mWebM;
+  }
+  KeySystemConfig& operator=(const KeySystemConfig& aOther) {
+    if (this == &aOther) {
+      return *this;
+    }
+    mKeySystem = aOther.mKeySystem;
+    mInitDataTypes = aOther.mInitDataTypes.Clone();
+    mPersistentState = aOther.mPersistentState;
+    mDistinctiveIdentifier = aOther.mDistinctiveIdentifier;
+    mSessionTypes = aOther.mSessionTypes.Clone();
+    mVideoRobustness = aOther.mVideoRobustness.Clone();
+    mAudioRobustness = aOther.mAudioRobustness.Clone();
+    mEncryptionSchemes = aOther.mEncryptionSchemes.Clone();
+    mMP4 = aOther.mMP4;
+    mWebM = aOther.mWebM;
+    return *this;
+  }
+  KeySystemConfig(KeySystemConfig&&) = default;
+  KeySystemConfig& operator=(KeySystemConfig&&) = default;
+
+  nsString mKeySystem;
+  nsTArray<nsString> mInitDataTypes;
+  Requirement mPersistentState = Requirement::NotAllowed;
+  Requirement mDistinctiveIdentifier = Requirement::NotAllowed;
+  nsTArray<SessionType> mSessionTypes;
+  nsTArray<nsString> mVideoRobustness;
+  nsTArray<nsString> mAudioRobustness;
+  nsTArray<nsString> mEncryptionSchemes;
+  ContainerSupport mMP4;
+  ContainerSupport mWebM;
+  bool mIsHW = false;
+};
+
+KeySystemConfig::SessionType ConvertToKeySystemConfigSessionType(
+    dom::MediaKeySessionType aType);
+const char* SessionTypeToStr(KeySystemConfig::SessionType aType);
+
+}  // namespace mozilla
+
+#endif  // DOM_MEDIA_EME_KEYSYSTEMCONFIG_H_