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114 lines
4.0 KiB
C++
114 lines
4.0 KiB
C++
/*
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* Copyright (C) 2010, Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef HRTFPanner_h
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#define HRTFPanner_h
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#include "FFTConvolver.h"
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#include "DelayProcessor.h"
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namespace mozilla {
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struct AudioChunk;
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}
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namespace WebCore {
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class HRTFDatabaseLoader;
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using mozilla::AudioChunk;
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class HRTFPanner {
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public:
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HRTFPanner(float sampleRate, mozilla::TemporaryRef<HRTFDatabaseLoader> databaseLoader);
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~HRTFPanner();
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// framesToProcess must be a power of 2 and greater than 128
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void pan(double azimuth, double elevation, const AudioChunk* inputBus, AudioChunk* outputBus, mozilla::TrackTicks framesToProcess);
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void reset();
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size_t fftSize() const { return m_convolverL1.fftSize(); }
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float sampleRate() const { return m_sampleRate; }
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int maxTailFrames() const;
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private:
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// Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database,
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// and azimuthBlend which is an interpolation value from 0 -> 1.
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int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend);
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mozilla::RefPtr<HRTFDatabaseLoader> m_databaseLoader;
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float m_sampleRate;
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// We maintain two sets of convolvers for smooth cross-faded interpolations when
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// then azimuth and elevation are dynamically changing.
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// When the azimuth and elevation are not changing, we simply process with one of the two sets.
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// Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and m_convolverR1.
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// Whenever the azimuth or elevation changes, a crossfade is initiated to transition
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// to the new position. So if we're currently processing with CrossfadeSelection1, then
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// we transition to CrossfadeSelection2 (and vice versa).
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// If we're in the middle of a transition, then we wait until it is complete before
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// initiating a new transition.
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// Selects either the convolver set (m_convolverL1, m_convolverR1) or (m_convolverL2, m_convolverR2).
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enum CrossfadeSelection {
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CrossfadeSelection1,
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CrossfadeSelection2
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};
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CrossfadeSelection m_crossfadeSelection;
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// azimuth/elevation for CrossfadeSelection1.
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int m_azimuthIndex1;
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double m_elevation1;
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// azimuth/elevation for CrossfadeSelection2.
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int m_azimuthIndex2;
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double m_elevation2;
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// A crossfade value 0 <= m_crossfadeX <= 1.
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float m_crossfadeX;
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// Per-sample-frame crossfade value increment.
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float m_crossfadeIncr;
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FFTConvolver m_convolverL1;
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FFTConvolver m_convolverR1;
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FFTConvolver m_convolverL2;
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FFTConvolver m_convolverR2;
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mozilla::DelayProcessor m_delayLineL;
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mozilla::DelayProcessor m_delayLineR;
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AudioFloatArray m_tempL1;
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AudioFloatArray m_tempR1;
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AudioFloatArray m_tempL2;
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AudioFloatArray m_tempR2;
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};
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} // namespace WebCore
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#endif // HRTFPanner_h
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