1 files changed, 389 insertions, 0 deletions
diff --git a/dom/media/webaudio/AudioNodeEngine.h b/dom/media/webaudio/AudioNodeEngine.h
new file mode 100644
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+++ b/dom/media/webaudio/AudioNodeEngine.h
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+/* -*- 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 MOZILLA_AUDIONODEENGINE_H_
+#define MOZILLA_AUDIONODEENGINE_H_
+
+#include "AudioSegment.h"
+#include "mozilla/dom/AudioNode.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Mutex.h"
+
+namespace WebCore {
+class Reverb;
+}  // namespace WebCore
+
+namespace mozilla {
+
+namespace dom {
+struct ThreeDPoint;
+class AudioParamTimeline;
+class DelayNodeEngine;
+struct AudioParamEvent;
+}  // namespace dom
+
+class AbstractThread;
+class AudioBlock;
+class AudioNodeTrack;
+
+/**
+ * This class holds onto a set of immutable channel buffers. The storage
+ * for the buffers must be malloced, but the buffer pointers and the malloc
+ * pointers can be different (e.g. if the buffers are contained inside
+ * some malloced object).
+ */
+class ThreadSharedFloatArrayBufferList final : public ThreadSharedObject {
+ public:
+  /**
+   * Construct with null channel data pointers.
+   */
+  explicit ThreadSharedFloatArrayBufferList(uint32_t aCount) {
+    mContents.SetLength(aCount);
+  }
+  /**
+   * Create with buffers suitable for transfer to
+   * JS::NewArrayBufferWithContents().  The buffer contents are uninitialized
+   * and so should be set using GetDataForWrite().
+   */
+  static already_AddRefed<ThreadSharedFloatArrayBufferList> Create(
+      uint32_t aChannelCount, size_t aLength, const mozilla::fallible_t&);
+
+  ThreadSharedFloatArrayBufferList* AsThreadSharedFloatArrayBufferList()
+      override {
+    return this;
+  };
+
+  struct Storage final {
+    Storage() : mDataToFree(nullptr), mFree(nullptr), mSampleData(nullptr) {}
+    ~Storage() {
+      if (mFree) {
+        mFree(mDataToFree);
+      } else {
+        MOZ_ASSERT(!mDataToFree);
+      }
+    }
+    size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
+      // NB: mSampleData might not be owned, if it is it just points to
+      //     mDataToFree.
+      return aMallocSizeOf(mDataToFree);
+    }
+    void* mDataToFree;
+    void (*mFree)(void*);
+    float* mSampleData;
+  };
+
+  /**
+   * This can be called on any thread.
+   */
+  uint32_t GetChannels() const { return mContents.Length(); }
+  /**
+   * This can be called on any thread.
+   */
+  const float* GetData(uint32_t aIndex) const {
+    return mContents[aIndex].mSampleData;
+  }
+  /**
+   * This can be called on any thread, but only when the calling thread is the
+   * only owner.
+   */
+  float* GetDataForWrite(uint32_t aIndex) {
+    MOZ_ASSERT(!IsShared());
+    return mContents[aIndex].mSampleData;
+  }
+
+  /**
+   * Call this only during initialization, before the object is handed to
+   * any other thread.
+   */
+  void SetData(uint32_t aIndex, void* aDataToFree, void (*aFreeFunc)(void*),
+               float* aData) {
+    Storage* s = &mContents[aIndex];
+    if (s->mFree) {
+      s->mFree(s->mDataToFree);
+    } else {
+      MOZ_ASSERT(!s->mDataToFree);
+    }
+
+    s->mDataToFree = aDataToFree;
+    s->mFree = aFreeFunc;
+    s->mSampleData = aData;
+  }
+
+  /**
+   * Put this object into an error state where there are no channels.
+   */
+  void Clear() { mContents.Clear(); }
+
+  size_t SizeOfExcludingThis(
+      mozilla::MallocSizeOf aMallocSizeOf) const override {
+    size_t amount = ThreadSharedObject::SizeOfExcludingThis(aMallocSizeOf);
+    amount += mContents.ShallowSizeOfExcludingThis(aMallocSizeOf);
+    for (size_t i = 0; i < mContents.Length(); i++) {
+      amount += mContents[i].SizeOfExcludingThis(aMallocSizeOf);
+    }
+
+    return amount;
+  }
+
+  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
+    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+  }
+
+ private:
+  AutoTArray<Storage, 2> mContents;
+};
+
+/**
+ * aChunk must have been allocated by AllocateAudioBlock.
+ */
+void WriteZeroesToAudioBlock(AudioBlock* aChunk, uint32_t aStart,
+                             uint32_t aLength);
+
+/**
+ * Copy with scale. aScale == 1.0f should be optimized.
+ */
+void AudioBufferCopyWithScale(const float* aInput, float aScale, float* aOutput,
+                              uint32_t aSize);
+
+/**
+ * Pointwise multiply-add operation. aScale == 1.0f should be optimized.
+ */
+void AudioBufferAddWithScale(const float* aInput, float aScale, float* aOutput,
+                             uint32_t aSize);
+
+/**
+ * Pointwise multiply-add operation. aScale == 1.0f should be optimized.
+ */
+void AudioBlockAddChannelWithScale(const float aInput[WEBAUDIO_BLOCK_SIZE],
+                                   float aScale,
+                                   float aOutput[WEBAUDIO_BLOCK_SIZE]);
+
+/**
+ * Pointwise copy-scaled operation. aScale == 1.0f should be optimized.
+ *
+ * Buffer size is implicitly assumed to be WEBAUDIO_BLOCK_SIZE.
+ */
+void AudioBlockCopyChannelWithScale(const float* aInput, float aScale,
+                                    float* aOutput);
+
+/**
+ * Vector copy-scaled operation.
+ */
+void AudioBlockCopyChannelWithScale(const float aInput[WEBAUDIO_BLOCK_SIZE],
+                                    const float aScale[WEBAUDIO_BLOCK_SIZE],
+                                    float aOutput[WEBAUDIO_BLOCK_SIZE]);
+
+/**
+ * Vector complex multiplication on arbitrary sized buffers.
+ */
+void BufferComplexMultiply(const float* aInput, const float* aScale,
+                           float* aOutput, uint32_t aSize);
+
+/**
+ * Vector maximum element magnitude ( max(abs(aInput)) ).
+ */
+float AudioBufferPeakValue(const float* aInput, uint32_t aSize);
+
+/**
+ * In place gain. aScale == 1.0f should be optimized.
+ */
+void AudioBlockInPlaceScale(float aBlock[WEBAUDIO_BLOCK_SIZE], float aScale);
+
+/**
+ * In place gain. aScale == 1.0f should be optimized.
+ */
+void AudioBufferInPlaceScale(float* aBlock, float aScale, uint32_t aSize);
+
+/**
+ * a-rate in place gain.
+ */
+void AudioBlockInPlaceScale(float aBlock[WEBAUDIO_BLOCK_SIZE],
+                            float aScale[WEBAUDIO_BLOCK_SIZE]);
+/**
+ * a-rate in place gain.
+ */
+void AudioBufferInPlaceScale(float* aBlock, float* aScale, uint32_t aSize);
+
+/**
+ * Upmix a mono input to a stereo output, scaling the two output channels by two
+ * different gain value.
+ * This algorithm is specified in the WebAudio spec.
+ */
+void AudioBlockPanMonoToStereo(const float aInput[WEBAUDIO_BLOCK_SIZE],
+                               float aGainL, float aGainR,
+                               float aOutputL[WEBAUDIO_BLOCK_SIZE],
+                               float aOutputR[WEBAUDIO_BLOCK_SIZE]);
+
+void AudioBlockPanMonoToStereo(const float aInput[WEBAUDIO_BLOCK_SIZE],
+                               float aGainL[WEBAUDIO_BLOCK_SIZE],
+                               float aGainR[WEBAUDIO_BLOCK_SIZE],
+                               float aOutputL[WEBAUDIO_BLOCK_SIZE],
+                               float aOutputR[WEBAUDIO_BLOCK_SIZE]);
+/**
+ * Pan a stereo source according to right and left gain, and the position
+ * (whether the listener is on the left of the source or not).
+ * This algorithm is specified in the WebAudio spec.
+ */
+void AudioBlockPanStereoToStereo(const float aInputL[WEBAUDIO_BLOCK_SIZE],
+                                 const float aInputR[WEBAUDIO_BLOCK_SIZE],
+                                 float aGainL, float aGainR, bool aIsOnTheLeft,
+                                 float aOutputL[WEBAUDIO_BLOCK_SIZE],
+                                 float aOutputR[WEBAUDIO_BLOCK_SIZE]);
+void AudioBlockPanStereoToStereo(const float aInputL[WEBAUDIO_BLOCK_SIZE],
+                                 const float aInputR[WEBAUDIO_BLOCK_SIZE],
+                                 const float aGainL[WEBAUDIO_BLOCK_SIZE],
+                                 const float aGainR[WEBAUDIO_BLOCK_SIZE],
+                                 const bool aIsOnTheLeft[WEBAUDIO_BLOCK_SIZE],
+                                 float aOutputL[WEBAUDIO_BLOCK_SIZE],
+                                 float aOutputR[WEBAUDIO_BLOCK_SIZE]);
+
+/**
+ * Replace NaN by zeros in aSamples.
+ */
+void NaNToZeroInPlace(float* aSamples, size_t aCount);
+
+/**
+ * Return the sum of squares of all of the samples in the input.
+ */
+float AudioBufferSumOfSquares(const float* aInput, uint32_t aLength);
+
+/**
+ * All methods of this class and its subclasses are called on the
+ * MediaTrackGraph thread.
+ */
+class AudioNodeEngine {
+ public:
+  // This should be compatible with AudioNodeTrack::OutputChunks.
+  typedef AutoTArray<AudioBlock, 1> OutputChunks;
+
+  explicit AudioNodeEngine(dom::AudioNode* aNode);
+
+  virtual ~AudioNodeEngine() {
+    MOZ_ASSERT(!mNode, "The node reference must be already cleared");
+    MOZ_COUNT_DTOR(AudioNodeEngine);
+  }
+
+  virtual dom::DelayNodeEngine* AsDelayNodeEngine() { return nullptr; }
+
+  virtual void SetTrackTimeParameter(uint32_t aIndex, TrackTime aParam) {
+    NS_ERROR("Invalid SetTrackTimeParameter index");
+  }
+  virtual void SetDoubleParameter(uint32_t aIndex, double aParam) {
+    NS_ERROR("Invalid SetDoubleParameter index");
+  }
+  virtual void SetInt32Parameter(uint32_t aIndex, int32_t aParam) {
+    NS_ERROR("Invalid SetInt32Parameter index");
+  }
+  virtual void RecvTimelineEvent(uint32_t aIndex,
+                                 dom::AudioParamEvent& aValue) {
+    NS_ERROR("Invalid RecvTimelineEvent index");
+  }
+  virtual void SetBuffer(AudioChunk&& aBuffer) {
+    NS_ERROR("SetBuffer called on engine that doesn't support it");
+  }
+  // This consumes the contents of aData.  aData will be emptied after this
+  // returns.
+  virtual void SetRawArrayData(nsTArray<float>&& aData) {
+    NS_ERROR("SetRawArrayData called on an engine that doesn't support it");
+  }
+
+  virtual void SetReverb(WebCore::Reverb* aBuffer,
+                         uint32_t aImpulseChannelCount) {
+    NS_ERROR("SetReverb called on engine that doesn't support it");
+  }
+
+  /**
+   * Produce the next block of audio samples, given input samples aInput
+   * (the mixed data for input 0).
+   * aInput is guaranteed to have float sample format (if it has samples at all)
+   * and to have been resampled to the sampling rate for the track, and to have
+   * exactly WEBAUDIO_BLOCK_SIZE samples.
+   * *aFinished is set to false by the caller. The callee must not set this to
+   * true unless silent output is produced. If set to true, we'll finish the
+   * track, consider this input inactive on any downstream nodes, and not
+   * call this again.
+   */
+  virtual void ProcessBlock(AudioNodeTrack* aTrack, GraphTime aFrom,
+                            const AudioBlock& aInput, AudioBlock* aOutput,
+                            bool* aFinished);
+  /**
+   * Produce the next block of audio samples, before input is provided.
+   * ProcessBlock() will be called later, and it then should not change
+   * aOutput.  This is used only for DelayNodeEngine in a feedback loop.
+   */
+  virtual void ProduceBlockBeforeInput(AudioNodeTrack* aTrack, GraphTime aFrom,
+                                       AudioBlock* aOutput) {
+    MOZ_ASSERT_UNREACHABLE("ProduceBlockBeforeInput called on wrong engine");
+  }
+
+  /**
+   * Produce the next block of audio samples, given input samples in the aInput
+   * array.  There is one input sample per port in aInput, in order.
+   * This is the multi-input/output version of ProcessBlock.  Only one kind
+   * of ProcessBlock is called on each node.  ProcessBlocksOnPorts() is called
+   * instead of ProcessBlock() if either the number of inputs or the number of
+   * outputs is greater than 1.
+   *
+   * The numbers of AudioBlocks in aInput and aOutput are always guaranteed to
+   * match the numbers of inputs and outputs for the node.
+   */
+  virtual void ProcessBlocksOnPorts(AudioNodeTrack* aTrack, GraphTime aFrom,
+                                    Span<const AudioBlock> aInput,
+                                    Span<AudioBlock> aOutput, bool* aFinished);
+
+  // IsActive() returns true if the engine needs to continue processing an
+  // unfinished track even when it has silent or no input connections.  This
+  // includes tail-times and when sources have been scheduled to start.  If
+  // returning false, then the track can be suspended.
+  virtual bool IsActive() const { return false; }
+
+  // Called on graph thread when the engine will not be used again.
+  virtual void OnGraphThreadDone() {}
+
+  bool HasNode() const {
+    MOZ_ASSERT(NS_IsMainThread());
+    return !!mNode;
+  }
+
+  dom::AudioNode* NodeMainThread() const {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mNode;
+  }
+
+  void ClearNode() {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mNode != nullptr);
+    mNode = nullptr;
+  }
+
+  uint16_t InputCount() const { return mInputCount; }
+  uint16_t OutputCount() const { return mOutputCount; }
+
+  virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
+    // NB: |mNode| is tracked separately so it is excluded here.
+    return 0;
+  }
+
+  virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
+    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+  }
+
+  void SizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
+                           AudioNodeSizes& aUsage) const {
+    aUsage.mEngine = SizeOfIncludingThis(aMallocSizeOf);
+    aUsage.mNodeType = mNodeType;
+  }
+
+ private:
+  // This is cleared from AudioNode::DestroyMediaTrack()
+  dom::AudioNode* MOZ_NON_OWNING_REF mNode;  // main thread only
+  const char* const mNodeType;
+  const uint16_t mInputCount;
+  const uint16_t mOutputCount;
+};
+
+}  // namespace mozilla
+
+#endif /* MOZILLA_AUDIONODEENGINE_H_ */