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EndedEventDispatcher

OscillatorNodeEngine

Parameters

Line Code
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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/. */

#include "OscillatorNode.h"
#include "AudioNodeEngine.h"
#include "AudioNodeStream.h"
#include "AudioDestinationNode.h"
#include "nsContentUtils.h"
#include "WebAudioUtils.h"
#include "blink/PeriodicWave.h"

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_INHERITED(OscillatorNode, AudioScheduledSourceNode,
                                   mPeriodicWave, mFrequency, mDetune)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(OscillatorNode)
NS_INTERFACE_MAP_END_INHERITING(AudioScheduledSourceNode)

NS_IMPL_ADDREF_INHERITED(OscillatorNode, AudioScheduledSourceNode)
NS_IMPL_RELEASE_INHERITED(OscillatorNode, AudioScheduledSourceNode)

class OscillatorNodeEngine final : public AudioNodeEngine
{
public:
  OscillatorNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination)
    : AudioNodeEngine(aNode)
    , mSource(nullptr)
    , mDestination(aDestination->Stream())
    , mStart(-1)
    , mStop(STREAM_TIME_MAX)
    // Keep the default values in sync with OscillatorNode::OscillatorNode.
    , mFrequency(440.f)
    , mDetune(0.f)
    , mType(OscillatorType::Sine)
    , mPhase(0.)
    , mFinalFrequency(0.)
    , mPhaseIncrement(0.)
    , mRecomputeParameters(true)
    , mCustomLength(0)
    , mCustomDisableNormalization(false)
  {
    MOZ_ASSERT(NS_IsMainThread());
    mBasicWaveFormCache = aDestination->Context()->GetBasicWaveFormCache();
  }

  void SetSourceStream(AudioNodeStream* aSource)
  {
    mSource = aSource;
  }

  enum Parameters {
    FREQUENCY,
    DETUNE,
    TYPE,
    PERIODICWAVE_LENGTH,
    DISABLE_NORMALIZATION,
    START,
    STOP,
  };
  void RecvTimelineEvent(uint32_t aIndex,
                         AudioTimelineEvent& aEvent) override
  {
    mRecomputeParameters = true;

    MOZ_ASSERT(mDestination);

    WebAudioUtils::ConvertAudioTimelineEventToTicks(aEvent,
                                                    mDestination);

    switch (aIndex) {
    case FREQUENCY:
      mFrequency.InsertEvent<int64_t>(aEvent);
      break;
    case DETUNE:
      mDetune.InsertEvent<int64_t>(aEvent);
      break;
    default:
      NS_ERROR("Bad OscillatorNodeEngine TimelineParameter");
    }
  }

  void SetStreamTimeParameter(uint32_t aIndex, StreamTime aParam) override
  {
    switch (aIndex) {
    case START:
      mStart = aParam;
      mSource->SetActive();
      break;
    case STOP: mStop = aParam; break;
    default:
      NS_ERROR("Bad OscillatorNodeEngine StreamTimeParameter");
    }
  }

  void SetInt32Parameter(uint32_t aIndex, int32_t aParam) override
  {
    switch (aIndex) {
      case TYPE:
        // Set the new type.
        mType = static_cast<OscillatorType>(aParam);
        if (mType == OscillatorType::Sine) {
          // Forget any previous custom data.
          mCustomLength = 0;
          mCustomDisableNormalization = false;
          mCustom = nullptr;
          mPeriodicWave = nullptr;
          mRecomputeParameters = true;
        }
        switch (mType) {
          case OscillatorType::Sine:
            mPhase = 0.0;
            break;
          case OscillatorType::Square:
          case OscillatorType::Triangle:
          case OscillatorType::Sawtooth:
            mPeriodicWave = mBasicWaveFormCache->GetBasicWaveForm(mType);
            break;
          case OscillatorType::Custom:
            break;
          default:
            NS_ERROR("Bad OscillatorNodeEngine type parameter.");
        }
        // End type switch.
        break;
      case PERIODICWAVE_LENGTH:
        MOZ_ASSERT(aParam >= 0, "negative custom array length");
        mCustomLength = static_cast<uint32_t>(aParam);
        break;
      case DISABLE_NORMALIZATION:
        MOZ_ASSERT(aParam >= 0, "negative custom array length");
        mCustomDisableNormalization = static_cast<uint32_t>(aParam);
        break;
      default:
        NS_ERROR("Bad OscillatorNodeEngine Int32Parameter.");
    }
    // End index switch.
  }

  void SetBuffer(already_AddRefed<ThreadSharedFloatArrayBufferList> aBuffer) override
  {
    MOZ_ASSERT(mCustomLength, "Custom buffer sent before length");
    mCustom = aBuffer;
    MOZ_ASSERT(mCustom->GetChannels() == 2,
               "PeriodicWave should have sent two channels");
    mPeriodicWave = WebCore::PeriodicWave::create(mSource->SampleRate(),
                                                  mCustom->GetData(0),
                                                  mCustom->GetData(1),
                                                  mCustomLength,
                                                  mCustomDisableNormalization);
  }

  void IncrementPhase()
  {
    const float twoPiFloat = float(2 * M_PI);
    mPhase += mPhaseIncrement;
    if (mPhase > twoPiFloat) {
      mPhase -= twoPiFloat;
    } else if (mPhase < -twoPiFloat) {
      mPhase += twoPiFloat;
    }
  }

  // Returns true if the final frequency (and thus the phase increment) changed,
  // false otherwise. This allow some optimizations at callsite.
  bool UpdateParametersIfNeeded(StreamTime ticks, size_t count)
  {
    double frequency, detune;

    // Shortcut if frequency-related AudioParam are not automated, and we
    // already have computed the frequency information and related parameters.
    if (!ParametersMayNeedUpdate()) {
      return false;
    }

    bool simpleFrequency = mFrequency.HasSimpleValue();
    bool simpleDetune = mDetune.HasSimpleValue();

    if (simpleFrequency) {
      frequency = mFrequency.GetValue();
    } else {
      frequency = mFrequency.GetValueAtTime(ticks, count);
    }
    if (simpleDetune) {
      detune = mDetune.GetValue();
    } else {
      detune = mDetune.GetValueAtTime(ticks, count);
    }

    float finalFrequency = frequency * pow(2., detune / 1200.);
    float signalPeriod = mSource->SampleRate() / finalFrequency;
    mRecomputeParameters = false;

    mPhaseIncrement = 2 * M_PI / signalPeriod;

    if (finalFrequency != mFinalFrequency) {
      mFinalFrequency = finalFrequency;
      return true;
    }
    return false;
  }

  void FillBounds(float* output, StreamTime ticks,
                  uint32_t& start, uint32_t& end)
  {
    MOZ_ASSERT(output);
    static_assert(StreamTime(WEBAUDIO_BLOCK_SIZE) < UINT_MAX,
        "WEBAUDIO_BLOCK_SIZE overflows interator bounds.");
    start = 0;
    if (ticks < mStart) {
      start = mStart - ticks;
      for (uint32_t i = 0; i < start; ++i) {
        output[i] = 0.0;
      }
    }
    end = WEBAUDIO_BLOCK_SIZE;
    if (ticks + end > mStop) {
      end = mStop - ticks;
      for (uint32_t i = end; i < WEBAUDIO_BLOCK_SIZE; ++i) {
        output[i] = 0.0;
      }
    }
  }

  void ComputeSine(float * aOutput, StreamTime ticks, uint32_t aStart, uint32_t aEnd)
  {
    for (uint32_t i = aStart; i < aEnd; ++i) {
      // We ignore the return value, changing the frequency has no impact on
      // performances here.
      UpdateParametersIfNeeded(ticks, i);

      aOutput[i] = sin(mPhase);

      IncrementPhase();
    }
  }

  bool ParametersMayNeedUpdate()
  {
    return !mDetune.HasSimpleValue() ||
           !mFrequency.HasSimpleValue() ||
           mRecomputeParameters;
  }

  void ComputeCustom(float* aOutput,
                     StreamTime ticks,
                     uint32_t aStart,
                     uint32_t aEnd)
  {
    MOZ_ASSERT(mPeriodicWave, "No custom waveform data");

    uint32_t periodicWaveSize = mPeriodicWave->periodicWaveSize();
    // Mask to wrap wave data indices into the range [0,periodicWaveSize).
    uint32_t indexMask = periodicWaveSize - 1;
    MOZ_ASSERT(periodicWaveSize && (periodicWaveSize & indexMask) == 0,
               "periodicWaveSize must be power of 2");
    float* higherWaveData = nullptr;
    float* lowerWaveData = nullptr;
    float tableInterpolationFactor;
    // Phase increment at frequency of 1 Hz.
    // mPhase runs [0,periodicWaveSize) here instead of [0,2*M_PI).
    float basePhaseIncrement = mPeriodicWave->rateScale();

    bool needToFetchWaveData = UpdateParametersIfNeeded(ticks, aStart);

    bool parametersMayNeedUpdate = ParametersMayNeedUpdate();
    mPeriodicWave->waveDataForFundamentalFrequency(mFinalFrequency,
                                                   lowerWaveData,
                                                   higherWaveData,
                                                   tableInterpolationFactor);

    for (uint32_t i = aStart; i < aEnd; ++i) {
      if (parametersMayNeedUpdate) {
        if (needToFetchWaveData) {
          mPeriodicWave->waveDataForFundamentalFrequency(mFinalFrequency,
                                                         lowerWaveData,
                                                         higherWaveData,
                                                         tableInterpolationFactor);
        }
        needToFetchWaveData = UpdateParametersIfNeeded(ticks, i);
      }
      // Bilinear interpolation between adjacent samples in each table.
      float floorPhase = floorf(mPhase);
      int j1Signed = static_cast<int>(floorPhase);
      uint32_t j1 = j1Signed & indexMask;
      uint32_t j2 = j1 + 1;
      j2 &= indexMask;

      float sampleInterpolationFactor = mPhase - floorPhase;

      float lower = (1.0f - sampleInterpolationFactor) * lowerWaveData[j1] +
                    sampleInterpolationFactor * lowerWaveData[j2];
      float higher = (1.0f - sampleInterpolationFactor) * higherWaveData[j1] +
                    sampleInterpolationFactor * higherWaveData[j2];
      aOutput[i] = (1.0f - tableInterpolationFactor) * lower +
                   tableInterpolationFactor * higher;

      // Calculate next phase position from wrapped value j1 to avoid loss of
      // precision at large values.
      mPhase =
        j1 + sampleInterpolationFactor + basePhaseIncrement * mFinalFrequency;
    }
  }

  void ComputeSilence(AudioBlock *aOutput)
  {
    aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
  }

  void ProcessBlock(AudioNodeStream* aStream,
                    GraphTime aFrom,
                    const AudioBlock& aInput,
                    AudioBlock* aOutput,
                    bool* aFinished) override
  {
    MOZ_ASSERT(mSource == aStream, "Invalid source stream");

    StreamTime ticks = mDestination->GraphTimeToStreamTime(aFrom);
    if (mStart == -1) {
      ComputeSilence(aOutput);
      return;
    }

    if (ticks + WEBAUDIO_BLOCK_SIZE <= mStart || ticks >= mStop) {
      ComputeSilence(aOutput);

    } else {
      aOutput->AllocateChannels(1);
      float* output = aOutput->ChannelFloatsForWrite(0);

      uint32_t start, end;
      FillBounds(output, ticks, start, end);

      // Synthesize the correct waveform.
      switch(mType) {
        case OscillatorType::Sine:
          ComputeSine(output, ticks, start, end);
          break;
        case OscillatorType::Square:
        case OscillatorType::Triangle:
        case OscillatorType::Sawtooth:
        case OscillatorType::Custom:
          ComputeCustom(output, ticks, start, end);
          break;
        default:
          ComputeSilence(aOutput);
      };
    }

    if (ticks + WEBAUDIO_BLOCK_SIZE >= mStop) {
      // We've finished playing.
      *aFinished = true;
    }
  }

  bool IsActive() const override
  {
    // start() has been called.
    return mStart != -1;
  }

  size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
  {
    size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);

    // Not owned:
    // - mSource
    // - mDestination
    // - mFrequency (internal ref owned by node)
    // - mDetune (internal ref owned by node)

    if (mCustom) {
      amount += mCustom->SizeOfIncludingThis(aMallocSizeOf);
    }

    if (mPeriodicWave) {
      amount += mPeriodicWave->sizeOfIncludingThis(aMallocSizeOf);
    }

    return amount;
  }

  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
  {
    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
  }

  AudioNodeStream* mSource;
  AudioNodeStream* mDestination;
  StreamTime mStart;
  StreamTime mStop;
  AudioParamTimeline mFrequency;
  AudioParamTimeline mDetune;
  OscillatorType mType;
  float mPhase;
  float mFinalFrequency;
  float mPhaseIncrement;
  bool mRecomputeParameters;
  RefPtr<ThreadSharedFloatArrayBufferList> mCustom;
  RefPtr<BasicWaveFormCache> mBasicWaveFormCache;
  uint32_t mCustomLength;
  bool mCustomDisableNormalization;
  RefPtr<WebCore::PeriodicWave> mPeriodicWave;
};

OscillatorNode::OscillatorNode(AudioContext* aContext)
  : AudioScheduledSourceNode(aContext,
                             2,
                             ChannelCountMode::Max,
                             ChannelInterpretation::Speakers)
  , mType(OscillatorType::Sine)
  , mFrequency(
    new AudioParam(this, OscillatorNodeEngine::FREQUENCY, "frequency", 440.0f,
                   -(aContext->SampleRate() / 2), aContext->SampleRate() / 2))
  , mDetune(new AudioParam(this, OscillatorNodeEngine::DETUNE, "detune", 0.0f))
  , mStartCalled(false)
{

  OscillatorNodeEngine* engine = new OscillatorNodeEngine(this, aContext->Destination());
  mStream = AudioNodeStream::Create(aContext, engine,
                                    AudioNodeStream::NEED_MAIN_THREAD_FINISHED,
                                    aContext->Graph());
  engine->SetSourceStream(mStream);
  mStream->AddMainThreadListener(this);
}

/* static */ already_AddRefed<OscillatorNode>
OscillatorNode::Create(AudioContext& aAudioContext,
                       const OscillatorOptions& aOptions,
                       ErrorResult& aRv)
{
  if (aAudioContext.CheckClosed(aRv)) {
    return nullptr;
  }

  RefPtr<OscillatorNode> audioNode = new OscillatorNode(&aAudioContext);

  audioNode->Initialize(aOptions, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  audioNode->SetType(aOptions.mType, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  audioNode->Frequency()->SetValue(aOptions.mFrequency);
  audioNode->Detune()->SetValue(aOptions.mDetune);

  if (aOptions.mPeriodicWave.WasPassed()) {
    audioNode->SetPeriodicWave(aOptions.mPeriodicWave.Value());
  }

  return audioNode.forget();
}

size_t
OscillatorNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
  size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);

  // For now only report if we know for sure that it's not shared.
  if (mPeriodicWave) {
    amount += mPeriodicWave->SizeOfIncludingThisIfNotShared(aMallocSizeOf);
  }
  amount += mFrequency->SizeOfIncludingThis(aMallocSizeOf);
  amount += mDetune->SizeOfIncludingThis(aMallocSizeOf);
  return amount;
}

size_t
OscillatorNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}

JSObject*
OscillatorNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  return OscillatorNodeBinding::Wrap(aCx, this, aGivenProto);
}

void
OscillatorNode::DestroyMediaStream()
{
  if (mStream) {
    mStream->RemoveMainThreadListener(this);
  }
  AudioNode::DestroyMediaStream();
}

void
OscillatorNode::SendTypeToStream()
{
  if (!mStream) {
    return;
  }
  if (mType == OscillatorType::Custom) {
    // The engine assumes we'll send the custom data before updating the type.
    SendPeriodicWaveToStream();
  }
  SendInt32ParameterToStream(OscillatorNodeEngine::TYPE, static_cast<int32_t>(mType));
}

void OscillatorNode::SendPeriodicWaveToStream()
{
  NS_ASSERTION(mType == OscillatorType::Custom,
               "Sending custom waveform to engine thread with non-custom type");
  MOZ_ASSERT(mStream, "Missing node stream.");
  MOZ_ASSERT(mPeriodicWave, "Send called without PeriodicWave object.");
  SendInt32ParameterToStream(OscillatorNodeEngine::PERIODICWAVE_LENGTH,
                             mPeriodicWave->DataLength());
  SendInt32ParameterToStream(OscillatorNodeEngine::DISABLE_NORMALIZATION,
                             mPeriodicWave->DisableNormalization());
  RefPtr<ThreadSharedFloatArrayBufferList> data =
    mPeriodicWave->GetThreadSharedBuffer();
  mStream->SetBuffer(data.forget());
}

void
OscillatorNode::Start(double aWhen, ErrorResult& aRv)
{
  if (!WebAudioUtils::IsTimeValid(aWhen)) {
    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
    return;
  }

  if (mStartCalled) {
    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
    return;
  }
  mStartCalled = true;

  if (!mStream) {
    // Nothing to play, or we're already dead for some reason
    return;
  }

  // TODO: Perhaps we need to do more here.
  mStream->SetStreamTimeParameter(OscillatorNodeEngine::START,
                                  Context(), aWhen);

  MarkActive();
}

void
OscillatorNode::Stop(double aWhen, ErrorResult& aRv)
{
  if (!WebAudioUtils::IsTimeValid(aWhen)) {
    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
    return;
  }

  if (!mStartCalled) {
    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
    return;
  }

  if (!mStream || !Context()) {
    // We've already stopped and had our stream shut down
    return;
  }

  // TODO: Perhaps we need to do more here.
  mStream->SetStreamTimeParameter(OscillatorNodeEngine::STOP,
                                  Context(), std::max(0.0, aWhen));
}

void
OscillatorNode::NotifyMainThreadStreamFinished()
{
  MOZ_ASSERT(mStream->IsFinished());

  class EndedEventDispatcher final : public Runnable
  {
  public:
    explicit EndedEventDispatcher(OscillatorNode* aNode)
      : mNode(aNode) {}
    NS_IMETHOD Run() override
    {
      // If it's not safe to run scripts right now, schedule this to run later
      if (!nsContentUtils::IsSafeToRunScript()) {
        nsContentUtils::AddScriptRunner(this);
        return NS_OK;
      }

      mNode->DispatchTrustedEvent(NS_LITERAL_STRING("ended"));
      // Release stream resources.
      mNode->DestroyMediaStream();
      return NS_OK;
    }
  private:
    RefPtr<OscillatorNode> mNode;
  };

  NS_DispatchToMainThread(new EndedEventDispatcher(this));

  // Drop the playing reference
  // Warning: The below line might delete this.
  MarkInactive();
}

} // namespace dom
} // namespace mozilla