1 files changed, 104 insertions, 0 deletions
diff --git a/dom/media/webaudio/blink/HRTFDatabase.h b/dom/media/webaudio/blink/HRTFDatabase.h
new file mode 100644
index 0000000000..50cf2958bd
--- /dev/null
+++ b/dom/media/webaudio/blink/HRTFDatabase.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef HRTFDatabase_h
+#define HRTFDatabase_h
+
+#include "HRTFElevation.h"
+#include "nsAutoRef.h"
+#include "nsTArray.h"
+#include "mozilla/MemoryReporting.h"
+
+namespace WebCore {
+
+class HRTFKernel;
+
+class HRTFDatabase {
+ public:
+  static nsReturnRef<HRTFDatabase> create(float sampleRate);
+
+  // clang-format off
+    // getKernelsFromAzimuthElevation() returns a left and right ear kernel, and an interpolated left and right frame delay for the given azimuth and elevation.
+    // azimuthBlend must be in the range 0 -> 1.
+    // Valid values for azimuthIndex are 0 -> HRTFElevation::NumberOfTotalAzimuths - 1 (corresponding to angles of 0 -> 360).
+    // Valid values for elevationAngle are MinElevation -> MaxElevation.
+  // clang-format on
+  void getKernelsFromAzimuthElevation(double azimuthBlend,
+                                      unsigned azimuthIndex,
+                                      double elevationAngle,
+                                      HRTFKernel*& kernelL,
+                                      HRTFKernel*& kernelR, double& frameDelayL,
+                                      double& frameDelayR);
+
+  // Returns the number of different azimuth angles.
+  static unsigned numberOfAzimuths() {
+    return HRTFElevation::NumberOfTotalAzimuths;
+  }
+
+  float sampleRate() const { return m_sampleRate; }
+
+  // Number of elevations loaded from resource.
+  static const unsigned NumberOfRawElevations;
+
+  size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ private:
+  HRTFDatabase(const HRTFDatabase& other) = delete;
+  void operator=(const HRTFDatabase& other) = delete;
+
+  explicit HRTFDatabase(float sampleRate);
+
+  // Minimum and maximum elevation angles (inclusive) for a HRTFDatabase.
+  static const int MinElevation;
+  static const int MaxElevation;
+  static const unsigned RawElevationAngleSpacing;
+
+  // Interpolates by this factor to get the total number of elevations from
+  // every elevation loaded from resource.
+  static const unsigned InterpolationFactor;
+
+  // Total number of elevations after interpolation.
+  static const unsigned NumberOfTotalElevations;
+
+  // Returns the index for the correct HRTFElevation given the elevation angle.
+  static unsigned indexFromElevationAngle(double);
+
+  nsTArray<nsAutoRef<HRTFElevation> > m_elevations;
+  float m_sampleRate;
+};
+
+}  // namespace WebCore
+
+template <>
+class nsAutoRefTraits<WebCore::HRTFDatabase>
+    : public nsPointerRefTraits<WebCore::HRTFDatabase> {
+ public:
+  static void Release(WebCore::HRTFDatabase* ptr) { delete (ptr); }
+};
+
+#endif  // HRTFDatabase_h