1 files changed, 45 insertions, 0 deletions
diff --git a/dom/media/webaudio/AudioNodeExternalInputStream.h b/dom/media/webaudio/AudioNodeExternalInputStream.h
new file mode 100644
index 000000000..83d2bba74
--- /dev/null
+++ b/dom/media/webaudio/AudioNodeExternalInputStream.h
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* 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_AUDIONODEEXTERNALINPUTSTREAM_H_
+#define MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_
+
+#include "MediaStreamGraph.h"
+#include "AudioNodeStream.h"
+#include "mozilla/Atomics.h"
+
+namespace mozilla {
+
+/**
+ * This is a MediaStream implementation that acts for a Web Audio node but
+ * unlike other AudioNodeStreams, supports any kind of MediaStream as an
+ * input --- handling any number of audio tracks and handling blocking of
+ * the input MediaStream.
+ */
+class AudioNodeExternalInputStream final : public AudioNodeStream
+{
+public:
+  static already_AddRefed<AudioNodeExternalInputStream>
+  Create(MediaStreamGraph* aGraph, AudioNodeEngine* aEngine);
+
+protected:
+  AudioNodeExternalInputStream(AudioNodeEngine* aEngine, TrackRate aSampleRate);
+  ~AudioNodeExternalInputStream();
+
+public:
+  void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) override;
+
+private:
+  /**
+   * Determines if this is enabled or not.  Disabled nodes produce silence.
+   * This node becomes disabled if the document principal does not subsume the
+   * DOMMediaStream principal.
+   */
+  bool IsEnabled();
+};
+
+} // namespace mozilla
+
+#endif /* MOZILLA_AUDIONODESTREAM_H_ */