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66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef PANNING_UTILS_H
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#define PANNING_UTILS_H
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#include "AudioSegment.h"
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#include "AudioNodeEngine.h"
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namespace mozilla {
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namespace dom {
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template<typename T>
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void
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GainMonoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
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T aGainL, T aGainR)
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{
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float* outputL = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[0]));
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float* outputR = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[1]));
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const float* input = static_cast<float*>(const_cast<void*>(aInput.mChannelData[0]));
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MOZ_ASSERT(aInput.ChannelCount() == 1);
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MOZ_ASSERT(aOutput->ChannelCount() == 2);
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AudioBlockPanMonoToStereo(input, aGainL, aGainR, outputL, outputR);
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}
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// T can be float or an array of float, and U can be bool or an array of bool,
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// depending if the value of the parameters are constant for this block.
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template<typename T, typename U>
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void
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GainStereoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
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T aGainL, T aGainR, U aOnLeft)
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{
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float* outputL = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[0]));
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float* outputR = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[1]));
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const float* inputL = static_cast<float*>(const_cast<void*>(aInput.mChannelData[0]));
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const float* inputR = static_cast<float*>(const_cast<void*>(aInput.mChannelData[1]));
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MOZ_ASSERT(aInput.ChannelCount() == 2);
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MOZ_ASSERT(aOutput->ChannelCount() == 2);
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AudioBlockPanStereoToStereo(inputL, inputR, aGainL, aGainR, aOnLeft, outputL, outputR);
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}
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// T can be float or an array of float, and U can be bool or an array of bool,
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// depending if the value of the parameters are constant for this block.
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template<typename T, typename U>
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void ApplyStereoPanning(const AudioChunk& aInput, AudioChunk* aOutput,
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T aGainL, T aGainR, U aOnLeft)
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{
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if (aInput.mChannelData.Length() == 1) {
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GainMonoToStereo(aInput, aOutput, aGainL, aGainR);
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} else {
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GainStereoToStereo(aInput, aOutput, aGainL, aGainR, aOnLeft);
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}
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}
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} // dom
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} // mozilla
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#endif // PANNING_UTILS_H
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