1 files changed, 146 insertions, 0 deletions
diff --git a/dom/media/webaudio/PeriodicWave.cpp b/dom/media/webaudio/PeriodicWave.cpp
new file mode 100644
index 0000000000..e036161724
--- /dev/null
+++ b/dom/media/webaudio/PeriodicWave.cpp
@@ -0,0 +1,146 @@
+/* -*- 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/. */
+
+#include "PeriodicWave.h"
+#include "AudioContext.h"
+#include "mozilla/dom/PeriodicWaveBinding.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PeriodicWave, mContext)
+
+PeriodicWave::PeriodicWave(AudioContext* aContext, const float* aRealData,
+                           const uint32_t aRealSize, const float* aImagData,
+                           const uint32_t aImagSize,
+                           const bool aDisableNormalization, ErrorResult& aRv)
+    : mContext(aContext), mDisableNormalization(aDisableNormalization) {
+  if (aRealData && aImagData && aRealSize != aImagSize) {
+    aRv.ThrowIndexSizeError("\"real\" and \"imag\" are different in length");
+    return;
+  }
+
+  uint32_t length = 0;
+  if (aRealData) {
+    length = aRealSize;
+  } else if (aImagData) {
+    length = aImagSize;
+  } else {
+    // If nothing has been passed, this PeriodicWave will be a sine wave: 2
+    // elements for each array, the second imaginary component set to 1.0.
+    length = 2;
+  }
+
+  if (length < 2) {
+    aRv.ThrowIndexSizeError(
+        "\"real\" and \"imag\" must have a length of "
+        "at least 2");
+    return;
+  }
+
+  MOZ_ASSERT(aContext);
+  MOZ_ASSERT((aRealData || aImagData) || length == 2);
+
+  // Caller should have checked this and thrown.
+  MOZ_ASSERT(length >= 2);
+  mCoefficients.mDuration = length;
+
+  // Copy coefficient data.
+  // The SharedBuffer and two arrays share a single allocation.
+  CheckedInt<size_t> bufferSize(sizeof(float));
+  bufferSize *= length;
+  bufferSize *= 2;
+  RefPtr<SharedBuffer> buffer = SharedBuffer::Create(bufferSize, fallible);
+  if (!buffer) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return;
+  }
+
+  auto data = static_cast<float*>(buffer->Data());
+  mCoefficients.mBuffer = std::move(buffer);
+
+  if (!aRealData && !aImagData) {
+    PodZero(data, length);
+    mCoefficients.mChannelData.AppendElement(data);
+    data += length;
+    data[0] = 0.0f;
+    data[1] = 1.0f;
+    mCoefficients.mChannelData.AppendElement(data);
+  } else {
+    if (aRealData) {
+      PodCopy(data, aRealData, length);
+    } else {
+      PodZero(data, length);
+    }
+    mCoefficients.mChannelData.AppendElement(data);
+
+    data += length;
+    if (aImagData) {
+      PodCopy(data, aImagData, length);
+    } else {
+      PodZero(data, length);
+    }
+    mCoefficients.mChannelData.AppendElement(data);
+  }
+  mCoefficients.mVolume = 1.0f;
+  mCoefficients.mBufferFormat = AUDIO_FORMAT_FLOAT32;
+}
+
+/* static */
+already_AddRefed<PeriodicWave> PeriodicWave::Constructor(
+    const GlobalObject& aGlobal, AudioContext& aAudioContext,
+    const PeriodicWaveOptions& aOptions, ErrorResult& aRv) {
+  const float* realData;
+  const float* imagData;
+  uint32_t realSize;
+  uint32_t imagSize;
+
+  if (aOptions.mReal.WasPassed()) {
+    realData = aOptions.mReal.Value().Elements();
+    realSize = aOptions.mReal.Value().Length();
+  } else {
+    realData = nullptr;
+    realSize = 0;
+  }
+
+  if (aOptions.mImag.WasPassed()) {
+    imagData = aOptions.mImag.Value().Elements();
+    imagSize = aOptions.mImag.Value().Length();
+  } else {
+    imagData = nullptr;
+    imagSize = 0;
+  }
+
+  RefPtr<PeriodicWave> wave =
+      new PeriodicWave(&aAudioContext, realData, realSize, imagData, imagSize,
+                       aOptions.mDisableNormalization, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  return wave.forget();
+}
+
+size_t PeriodicWave::SizeOfExcludingThisIfNotShared(
+    MallocSizeOf aMallocSizeOf) const {
+  // Not owned:
+  // - mContext
+  size_t amount = 0;
+  amount += mCoefficients.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+
+  return amount;
+}
+
+size_t PeriodicWave::SizeOfIncludingThisIfNotShared(
+    MallocSizeOf aMallocSizeOf) const {
+  return aMallocSizeOf(this) + SizeOfExcludingThisIfNotShared(aMallocSizeOf);
+}
+
+JSObject* PeriodicWave::WrapObject(JSContext* aCx,
+                                   JS::Handle<JSObject*> aGivenProto) {
+  return PeriodicWave_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+}  // namespace mozilla::dom