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diff --git a/dom/media/gtest/AudioGenerator.h b/dom/media/gtest/AudioGenerator.h
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+++ b/dom/media/gtest/AudioGenerator.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_MEDIA_GTEST_AUDIO_GENERATOR_H_
+#define DOM_MEDIA_GTEST_AUDIO_GENERATOR_H_
+
+#include "AudioSegment.h"
+#include "prtime.h"
+#include "SineWaveGenerator.h"
+
+namespace mozilla {
+
+template <typename Sample>
+class AudioGenerator {
+ public:
+  AudioGenerator(uint32_t aChannels, uint32_t aSampleRate,
+                 uint32_t aFrequency = 1000)
+      : mSampleRate(aSampleRate),
+        mFrequency(aFrequency),
+        mChannelCount(aChannels),
+        mGenerator(aSampleRate, aFrequency) {}
+
+  void Generate(mozilla::AudioSegment& aSegment, uint32_t aFrameCount) {
+    CheckedInt<size_t> bufferSize(sizeof(Sample));
+    bufferSize *= aFrameCount;
+    RefPtr<SharedBuffer> buffer = SharedBuffer::Create(bufferSize);
+    Sample* dest = static_cast<Sample*>(buffer->Data());
+    mGenerator.generate(dest, aFrameCount);
+    AutoTArray<const Sample*, 1> channels;
+    for (uint32_t i = 0; i < mChannelCount; ++i) {
+      channels.AppendElement(dest);
+    }
+    aSegment.AppendFrames(buffer.forget(), channels, aFrameCount,
+                          PRINCIPAL_HANDLE_NONE);
+  }
+
+  void GenerateInterleaved(Sample* aSamples, uint32_t aFrameCount) {
+    mGenerator.generate(aSamples, aFrameCount, mChannelCount);
+  }
+
+  void SetChannelsCount(uint32_t aChannelCount) {
+    mChannelCount = aChannelCount;
+  }
+
+  uint32_t ChannelCount() const { return mChannelCount; }
+
+  static float Amplitude() {
+    return mozilla::SineWaveGenerator<Sample>::Amplitude();
+  }
+
+  const uint32_t mSampleRate;
+  const uint32_t mFrequency;
+
+ private:
+  uint32_t mChannelCount;
+  mozilla::SineWaveGenerator<Sample> mGenerator;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_MEDIA_GTEST_AUDIO_GENERATOR_H_