tenfourfox/dom/media/webaudio/BiquadFilterNode.cpp

/* -*- 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 "BiquadFilterNode.h"
#include "AudioNodeEngine.h"
#include "AudioNodeStream.h"
#include "AudioDestinationNode.h"
#include "PlayingRefChangeHandler.h"
#include "WebAudioUtils.h"
#include "blink/Biquad.h"
#include "mozilla/Preferences.h"
#include "mozilla/UniquePtr.h"
#include "AudioParamTimeline.h"

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_INHERITED(BiquadFilterNode, AudioNode,
                                   mFrequency, mDetune, mQ, mGain)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(BiquadFilterNode)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)

NS_IMPL_ADDREF_INHERITED(BiquadFilterNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(BiquadFilterNode, AudioNode)

static void
SetParamsOnBiquad(WebCore::Biquad& aBiquad,
                  float aSampleRate,
                  BiquadFilterType aType,
                  double aFrequency,
                  double aQ,
                  double aGain,
                  double aDetune)
{
  const double nyquist = aSampleRate * 0.5;
  double normalizedFrequency = aFrequency / nyquist;

  if (aDetune) {
    normalizedFrequency *= std::pow(2.0, aDetune / 1200);
  }

  switch (aType) {
  case BiquadFilterType::Lowpass:
    aBiquad.setLowpassParams(normalizedFrequency, aQ);
    break;
  case BiquadFilterType::Highpass:
    aBiquad.setHighpassParams(normalizedFrequency, aQ);
    break;
  case BiquadFilterType::Bandpass:
    aBiquad.setBandpassParams(normalizedFrequency, aQ);
    break;
  case BiquadFilterType::Lowshelf:
    aBiquad.setLowShelfParams(normalizedFrequency, aGain);
    break;
  case BiquadFilterType::Highshelf:
    aBiquad.setHighShelfParams(normalizedFrequency, aGain);
    break;
  case BiquadFilterType::Peaking:
    aBiquad.setPeakingParams(normalizedFrequency, aQ, aGain);
    break;
  case BiquadFilterType::Notch:
    aBiquad.setNotchParams(normalizedFrequency, aQ);
    break;
  case BiquadFilterType::Allpass:
    aBiquad.setAllpassParams(normalizedFrequency, aQ);
    break;
  default:
    NS_NOTREACHED("We should never see the alternate names here");
    break;
  }
}

class BiquadFilterNodeEngine final : public AudioNodeEngine
{
public:
  BiquadFilterNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination)
    : AudioNodeEngine(aNode)
    , mDestination(aDestination->Stream())
    // Keep the default values in sync with the default values in
    // BiquadFilterNode::BiquadFilterNode
    , mType(BiquadFilterType::Lowpass)
    , mFrequency(350.f)
    , mDetune(0.f)
    , mQ(1.f)
    , mGain(0.f)
  {
  }

  enum Parameteres {
    TYPE,
    FREQUENCY,
    DETUNE,
    Q,
    GAIN
  };
  void SetInt32Parameter(uint32_t aIndex, int32_t aValue) override
  {
    switch (aIndex) {
    case TYPE: mType = static_cast<BiquadFilterType>(aValue); break;
    default:
      NS_ERROR("Bad BiquadFilterNode Int32Parameter");
    }
  }
  void RecvTimelineEvent(uint32_t aIndex,
                         AudioTimelineEvent& aEvent) override
  {
    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;
    case Q:
      mQ.InsertEvent<int64_t>(aEvent);
      break;
    case GAIN:
      mGain.InsertEvent<int64_t>(aEvent);
      break;
    default:
      NS_ERROR("Bad BiquadFilterNodeEngine TimelineParameter");
    }
  }

  virtual void ProcessBlock(AudioNodeStream* aStream,
                            GraphTime aFrom,
                            const AudioBlock& aInput,
                            AudioBlock* aOutput,
                            bool* aFinished) override
  {
    float inputBuffer[WEBAUDIO_BLOCK_SIZE];

    if (aInput.IsNull()) {
      bool hasTail = false;
      for (uint32_t i = 0; i < mBiquads.Length(); ++i) {
        if (mBiquads[i].hasTail()) {
          hasTail = true;
          break;
        }
      }
      if (!hasTail) {
        if (!mBiquads.IsEmpty()) {
          mBiquads.Clear();
          aStream->ScheduleCheckForInactive();

          RefPtr<PlayingRefChangeHandler> refchanged =
            new PlayingRefChangeHandler(aStream, PlayingRefChangeHandler::RELEASE);
          aStream->Graph()->
            DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
        }

        aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
        return;
      }

      PodArrayZero(inputBuffer);

    } else if(mBiquads.Length() != aInput.ChannelCount()){
      if (mBiquads.IsEmpty()) {
        RefPtr<PlayingRefChangeHandler> refchanged =
          new PlayingRefChangeHandler(aStream, PlayingRefChangeHandler::ADDREF);
        aStream->Graph()->
          DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
      } else { // Help people diagnose bug 924718
        NS_WARNING("BiquadFilterNode channel count changes may produce audio glitches");
      }

      // Adjust the number of biquads based on the number of channels
      mBiquads.SetLength(aInput.ChannelCount());
    }

    uint32_t numberOfChannels = mBiquads.Length();
    aOutput->AllocateChannels(numberOfChannels);

    StreamTime pos = mDestination->GraphTimeToStreamTime(aFrom);

    double freq = mFrequency.GetValueAtTime(pos);
    double q = mQ.GetValueAtTime(pos);
    double gain = mGain.GetValueAtTime(pos);
    double detune = mDetune.GetValueAtTime(pos);

    for (uint32_t i = 0; i < numberOfChannels; ++i) {
      const float* input;
      if (aInput.IsNull()) {
        input = inputBuffer;
      } else {
        input = static_cast<const float*>(aInput.mChannelData[i]);
        if (aInput.mVolume != 1.0) {
          AudioBlockCopyChannelWithScale(input, aInput.mVolume, inputBuffer);
          input = inputBuffer;
        }
      }
      SetParamsOnBiquad(mBiquads[i], aStream->SampleRate(), mType, freq, q, gain, detune);

      mBiquads[i].process(input,
                          aOutput->ChannelFloatsForWrite(i),
                          aInput.GetDuration());
    }
  }

  virtual bool IsActive() const override
  {
    return !mBiquads.IsEmpty();
  }

  virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
  {
    // Not owned:
    // - mDestination - probably not owned
    // - AudioParamTimelines - counted in the AudioNode
    size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
    amount += mBiquads.ShallowSizeOfExcludingThis(aMallocSizeOf);
    return amount;
  }

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

private:
  AudioNodeStream* mDestination;
  BiquadFilterType mType;
  AudioParamTimeline mFrequency;
  AudioParamTimeline mDetune;
  AudioParamTimeline mQ;
  AudioParamTimeline mGain;
  nsTArray<WebCore::Biquad> mBiquads;
};

BiquadFilterNode::BiquadFilterNode(AudioContext* aContext)
  : AudioNode(aContext,
              2,
              ChannelCountMode::Max,
              ChannelInterpretation::Speakers)
  , mType(BiquadFilterType::Lowpass)
  , mFrequency(new AudioParam(this, BiquadFilterNodeEngine::FREQUENCY,
                              350.f, "frequency"))
  , mDetune(new AudioParam(this, BiquadFilterNodeEngine::DETUNE, 0.f, "detune"))
  , mQ(new AudioParam(this, BiquadFilterNodeEngine::Q, 1.f, "Q"))
  , mGain(new AudioParam(this, BiquadFilterNodeEngine::GAIN, 0.f, "gain"))
{
  BiquadFilterNodeEngine* engine = new BiquadFilterNodeEngine(this, aContext->Destination());
  mStream = AudioNodeStream::Create(aContext, engine,
                                    AudioNodeStream::NO_STREAM_FLAGS);
}

BiquadFilterNode::~BiquadFilterNode()
{
}

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

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

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

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

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

  return amount;
}

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

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

void
BiquadFilterNode::SetType(BiquadFilterType aType)
{
  mType = aType;
  SendInt32ParameterToStream(BiquadFilterNodeEngine::TYPE,
                             static_cast<int32_t>(aType));
}

void
BiquadFilterNode::GetFrequencyResponse(const Float32Array& aFrequencyHz,
                                       const Float32Array& aMagResponse,
                                       const Float32Array& aPhaseResponse)
{
  aFrequencyHz.ComputeLengthAndData();
  aMagResponse.ComputeLengthAndData();
  aPhaseResponse.ComputeLengthAndData();

  uint32_t length = std::min(std::min(aFrequencyHz.Length(), aMagResponse.Length()),
                             aPhaseResponse.Length());
  if (!length) {
    return;
  }

  auto frequencies = MakeUnique<float[]>(length);
  float* frequencyHz = aFrequencyHz.Data();
  const double nyquist = Context()->SampleRate() * 0.5;

  // Normalize the frequencies
  for (uint32_t i = 0; i < length; ++i) {
    if (frequencyHz[i] >= 0 && frequencyHz[i] <= nyquist) {
        frequencies[i] = static_cast<float>(frequencyHz[i] / nyquist);
    } else {
        frequencies[i] = std::numeric_limits<float>::quiet_NaN();
    }
  }

  const double currentTime = Context()->CurrentTime();

  double freq = mFrequency->GetValueAtTime(currentTime);
  double q = mQ->GetValueAtTime(currentTime);
  double gain = mGain->GetValueAtTime(currentTime);
  double detune = mDetune->GetValueAtTime(currentTime);

  WebCore::Biquad biquad;
  SetParamsOnBiquad(biquad, Context()->SampleRate(), mType, freq, q, gain, detune);
  biquad.getFrequencyResponse(int(length), frequencies.get(), aMagResponse.Data(), aPhaseResponse.Data());
}

} // namespace dom
} // namespace mozilla