1 files changed, 71 insertions, 0 deletions
diff --git a/dom/media/webaudio/AudioProcessingEvent.h b/dom/media/webaudio/AudioProcessingEvent.h
new file mode 100644
index 0000000000..3b8b9cf008
--- /dev/null
+++ b/dom/media/webaudio/AudioProcessingEvent.h
@@ -0,0 +1,71 @@
+/* -*- 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 AudioProcessingEvent_h_
+#define AudioProcessingEvent_h_
+
+#include "AudioBuffer.h"
+#include "ScriptProcessorNode.h"
+#include "mozilla/dom/Event.h"
+
+namespace mozilla::dom {
+
+class AudioProcessingEvent final : public Event {
+ public:
+  AudioProcessingEvent(ScriptProcessorNode* aOwner, nsPresContext* aPresContext,
+                       WidgetEvent* aEvent);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioProcessingEvent, Event)
+
+  JSObject* WrapObjectInternal(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  using Event::InitEvent;
+  void InitEvent(AudioBuffer* aInputBuffer, uint32_t aNumberOfInputChannels,
+                 double aPlaybackTime) {
+    InitEvent(u"audioprocess"_ns, CanBubble::eNo, Cancelable::eNo);
+    mInputBuffer = aInputBuffer;
+    mNumberOfInputChannels = aNumberOfInputChannels;
+    mPlaybackTime = aPlaybackTime;
+  }
+
+  double PlaybackTime() const { return mPlaybackTime; }
+
+  AudioBuffer* GetInputBuffer(ErrorResult& aRv) {
+    if (!mInputBuffer) {
+      mInputBuffer = LazilyCreateBuffer(mNumberOfInputChannels, aRv);
+    }
+    return mInputBuffer;
+  }
+
+  AudioBuffer* GetOutputBuffer(ErrorResult& aRv) {
+    if (!mOutputBuffer) {
+      mOutputBuffer = LazilyCreateBuffer(mNode->NumberOfOutputChannels(), aRv);
+    }
+    return mOutputBuffer;
+  }
+
+  bool HasOutputBuffer() const { return !!mOutputBuffer; }
+
+ protected:
+  virtual ~AudioProcessingEvent();
+
+ private:
+  already_AddRefed<AudioBuffer> LazilyCreateBuffer(uint32_t aNumberOfChannels,
+                                                   ErrorResult& rv);
+
+ private:
+  double mPlaybackTime;
+  RefPtr<AudioBuffer> mInputBuffer;
+  RefPtr<AudioBuffer> mOutputBuffer;
+  RefPtr<ScriptProcessorNode> mNode;
+  uint32_t mNumberOfInputChannels;
+};
+
+}  // namespace mozilla::dom
+
+#endif