1 files changed, 53 insertions, 0 deletions
diff --git a/dom/media/webaudio/GainNode.h b/dom/media/webaudio/GainNode.h
new file mode 100644
index 0000000000..d2790af746
--- /dev/null
+++ b/dom/media/webaudio/GainNode.h
@@ -0,0 +1,53 @@
+/* -*- 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 GainNode_h_
+#define GainNode_h_
+
+#include "AudioNode.h"
+#include "AudioParam.h"
+
+namespace mozilla::dom {
+
+class AudioContext;
+struct GainOptions;
+
+class GainNode final : public AudioNode {
+ public:
+  static already_AddRefed<GainNode> Create(AudioContext& aAudioContext,
+                                           const GainOptions& aOptions,
+                                           ErrorResult& aRv);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(GainNode, AudioNode)
+
+  static already_AddRefed<GainNode> Constructor(const GlobalObject& aGlobal,
+                                                AudioContext& aAudioContext,
+                                                const GainOptions& aOptions,
+                                                ErrorResult& aRv) {
+    return Create(aAudioContext, aOptions, aRv);
+  }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  AudioParam* Gain() const { return mGain; }
+
+  const char* NodeType() const override { return "GainNode"; }
+
+  size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override;
+  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override;
+
+ private:
+  explicit GainNode(AudioContext* aContext);
+  ~GainNode() = default;
+
+  RefPtr<AudioParam> mGain;
+};
+
+}  // namespace mozilla::dom
+
+#endif