third_party/WebKit/Source/modules/webaudio/DelayDSPKernel.cpp

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
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#include "modules/webaudio/DelayDSPKernel.h"
#include <algorithm>
#include "platform/audio/AudioUtilities.h"
#include "platform/wtf/MathExtras.h"

namespace blink {

DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor)
    : AudioDelayDSPKernel(processor, AudioUtilities::kRenderQuantumFrames) {
  DCHECK(processor);
  DCHECK_GT(processor->SampleRate(), 0);
  if (!(processor && processor->SampleRate() > 0))
    return;

  max_delay_time_ = processor->MaxDelayTime();
  DCHECK_GE(max_delay_time_, 0);
  DCHECK(!std::isnan(max_delay_time_));
  if (max_delay_time_ < 0 || std::isnan(max_delay_time_))
    return;

  buffer_.Allocate(
      BufferLengthForDelay(max_delay_time_, processor->SampleRate()));
  buffer_.Zero();
}

bool DelayDSPKernel::HasSampleAccurateValues() {
  return GetDelayProcessor()->DelayTime().HasSampleAccurateValues();
}

void DelayDSPKernel::CalculateSampleAccurateValues(float* delay_times,
                                                   size_t frames_to_process) {
  GetDelayProcessor()->DelayTime().CalculateSampleAccurateValues(
      delay_times, frames_to_process);
}

double DelayDSPKernel::DelayTime(float) {
  return GetDelayProcessor()->DelayTime().FinalValue();
}

void DelayDSPKernel::ProcessOnlyAudioParams(size_t frames_to_process) {
  DCHECK_LE(frames_to_process, AudioUtilities::kRenderQuantumFrames);

  float values[AudioUtilities::kRenderQuantumFrames];

  GetDelayProcessor()->DelayTime().CalculateSampleAccurateValues(
      values, frames_to_process);
}

}  // namespace blink