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61 lines
1.9 KiB
C
61 lines
1.9 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 DelayProcessor_h_
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#define DelayProcessor_h_
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#include "nsTArray.h"
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namespace mozilla {
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class DelayProcessor {
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public:
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// See WebAudioUtils::ComputeSmoothingRate() for frame to frame exponential
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// |smoothingRate| multiplier.
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DelayProcessor(int aMaxDelayFrames, double aSmoothingRate)
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: mSmoothingRate(aSmoothingRate)
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, mCurrentDelay(0.)
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, mMaxDelayFrames(aMaxDelayFrames)
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, mWriteIndex(0)
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{
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}
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// Process with an array of delays, in frames, for each frame.
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void Process(const double *aPerFrameDelays,
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const float* const* aInputChannels,
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float* const* aOutputChannels,
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int aChannelCount, int aFramesToProcess);
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// Process with a constant delay, which will be smoothed with the previous
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// delay.
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void Process(double aDelayFrames, const float* const* aInputChannels,
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float* const* aOutputChannels, int aChannelCount,
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int aFramesToProcess);
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void Reset() { mBuffer.Clear(); };
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double CurrentDelayFrames() const { return mCurrentDelay; }
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int BufferChannelCount() const { return mBuffer.Length(); }
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private:
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bool EnsureBuffer(uint32_t aNumberOfChannels);
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// Circular buffer for capturing delayed samples.
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AutoFallibleTArray<FallibleTArray<float>, 2> mBuffer;
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double mSmoothingRate;
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// Current delay, in fractional frames
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double mCurrentDelay;
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// Maximum delay, in frames
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int mMaxDelayFrames;
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// Write index for the buffer, to write the frames to the correct index of the buffer
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// given the current delay.
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int mWriteIndex;
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};
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} // mozilla
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#endif // DelayProcessor_h_
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