dom/media/webaudio/PanningUtils.h
author Mike Hommey <mh+mozilla@glandium.org>
Thu, 26 Mar 2015 12:07:17 +0900
changeset 258314 fc1e894eec2fbd34b745cd94f505080427d24705
parent 244236 d112575f39f997e1e25602d89cd93f5bb18c347e
child 284279 91d6e262b662a0b4e47358665e222d3927337af9
permissions -rw-r--r--
Bug 1147207 - Add a ComposedFinder class that acts like a FileFinder proxy over multiple FileFinders. r=gps, a=sledru

/* -*- 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 PANNING_UTILS_H
#define PANNING_UTILS_H

#include "AudioSegment.h"
#include "AudioNodeEngine.h"

namespace mozilla {
namespace dom {

template<typename T>
void
GainMonoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
                 T aGainL, T aGainR)
{
  float* outputL = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[0]));
  float* outputR = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[1]));
  const float* input = static_cast<float*>(const_cast<void*>(aInput.mChannelData[0]));

  MOZ_ASSERT(aInput.ChannelCount() == 1);
  MOZ_ASSERT(aOutput->ChannelCount() == 2);

  AudioBlockPanMonoToStereo(input, aGainL, aGainR, outputL, outputR);
}

// T can be float or an array of float, and  U can be bool or an array of bool,
// depending if the value of the parameters are constant for this block.
template<typename T, typename U>
void
GainStereoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
                   T aGainL, T aGainR, U aOnLeft)
{
  float* outputL = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[0]));
  float* outputR = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[1]));
  const float* inputL = static_cast<float*>(const_cast<void*>(aInput.mChannelData[0]));
  const float* inputR = static_cast<float*>(const_cast<void*>(aInput.mChannelData[1]));

  MOZ_ASSERT(aInput.ChannelCount() == 2);
  MOZ_ASSERT(aOutput->ChannelCount() == 2);

  AudioBlockPanStereoToStereo(inputL, inputR, aGainL, aGainR, aOnLeft, outputL, outputR);
}

// T can be float or an array of float, and  U can be bool or an array of bool,
// depending if the value of the parameters are constant for this block.
template<typename T, typename U>
void ApplyStereoPanning(const AudioChunk& aInput, AudioChunk* aOutput,
                        T aGainL, T aGainR, U aOnLeft)
{
  if (aInput.mChannelData.Length() == 1) {
    GainMonoToStereo(aInput, aOutput, aGainL, aGainR);
  } else {
    GainStereoToStereo(aInput, aOutput, aGainL, aGainR, aOnLeft);
  }
}

} // dom
} // mozilla

#endif // PANNING_UTILS_H