dom/media/webaudio/blink/HRTFPanner.h
author Nathan Froyd <froydnj@mozilla.com>
Sun, 18 Oct 2015 01:24:48 -0400
changeset 268184 e8c7dfe727cd970e2c3294934e2927b14143c205
parent 268182 ca86c21a96b4ec676afc55d3b714c22c547884b2
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1207245 - part 6 - rename nsRefPtr<T> to RefPtr<T>; r=ehsan; a=Tomcat The bulk of this commit was generated with a script, executed at the top level of a typical source code checkout. The only non-machine-generated part was modifying MFBT's moz.build to reflect the new naming. CLOSED TREE makes big refactorings like this a piece of cake. # The main substitution. find . -name '*.cpp' -o -name '*.cc' -o -name '*.h' -o -name '*.mm' -o -name '*.idl'| \ xargs perl -p -i -e ' s/nsRefPtr\.h/RefPtr\.h/g; # handle includes s/nsRefPtr ?</RefPtr</g; # handle declarations and variables ' # Handle a special friend declaration in gfx/layers/AtomicRefCountedWithFinalize.h. perl -p -i -e 's/::nsRefPtr;/::RefPtr;/' gfx/layers/AtomicRefCountedWithFinalize.h # Handle nsRefPtr.h itself, a couple places that define constructors # from nsRefPtr, and code generators specially. We do this here, rather # than indiscriminantly s/nsRefPtr/RefPtr/, because that would rename # things like nsRefPtrHashtable. perl -p -i -e 's/nsRefPtr/RefPtr/g' \ mfbt/nsRefPtr.h \ xpcom/glue/nsCOMPtr.h \ xpcom/base/OwningNonNull.h \ ipc/ipdl/ipdl/lower.py \ ipc/ipdl/ipdl/builtin.py \ dom/bindings/Codegen.py \ python/lldbutils/lldbutils/utils.py # In our indiscriminate substitution above, we renamed # nsRefPtrGetterAddRefs, the class behind getter_AddRefs. Fix that up. find . -name '*.cpp' -o -name '*.h' -o -name '*.idl' | \ xargs perl -p -i -e 's/nsRefPtrGetterAddRefs/RefPtrGetterAddRefs/g' if [ -d .git ]; then git mv mfbt/nsRefPtr.h mfbt/RefPtr.h else hg mv mfbt/nsRefPtr.h mfbt/RefPtr.h fi

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#ifndef HRTFPanner_h
#define HRTFPanner_h

#include "FFTConvolver.h"
#include "DelayBuffer.h"
#include "mozilla/MemoryReporting.h"

namespace mozilla {
class AudioBlock;
} // namespace mozilla

namespace WebCore {

typedef nsTArray<float> AudioFloatArray;

class HRTFDatabaseLoader;

using mozilla::AudioBlock;

class HRTFPanner {
public:
    HRTFPanner(float sampleRate, already_AddRefed<HRTFDatabaseLoader> databaseLoader);
    ~HRTFPanner();

    // chunk durations must be 128
    void pan(double azimuth, double elevation, const AudioBlock* inputBus, AudioBlock* outputBus);
    void reset();

    size_t fftSize() const { return m_convolverL1.fftSize(); }

    float sampleRate() const { return m_sampleRate; }

    int maxTailFrames() const;

    size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

private:
    // Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database,
    // and azimuthBlend which is an interpolation value from 0 -> 1.
    int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend);

    RefPtr<HRTFDatabaseLoader> m_databaseLoader;

    float m_sampleRate;

    // We maintain two sets of convolvers for smooth cross-faded interpolations when
    // then azimuth and elevation are dynamically changing.
    // When the azimuth and elevation are not changing, we simply process with one of the two sets.
    // Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and m_convolverR1.
    // Whenever the azimuth or elevation changes, a crossfade is initiated to transition
    // to the new position. So if we're currently processing with CrossfadeSelection1, then
    // we transition to CrossfadeSelection2 (and vice versa).
    // If we're in the middle of a transition, then we wait until it is complete before
    // initiating a new transition.

    // Selects either the convolver set (m_convolverL1, m_convolverR1) or (m_convolverL2, m_convolverR2).
    enum CrossfadeSelection {
        CrossfadeSelection1,
        CrossfadeSelection2
    };

    CrossfadeSelection m_crossfadeSelection;

    // azimuth/elevation for CrossfadeSelection1.
    int m_azimuthIndex1;
    double m_elevation1;

    // azimuth/elevation for CrossfadeSelection2.
    int m_azimuthIndex2;
    double m_elevation2;

    // A crossfade value 0 <= m_crossfadeX <= 1.
    float m_crossfadeX;

    // Per-sample-frame crossfade value increment.
    float m_crossfadeIncr;

    FFTConvolver m_convolverL1;
    FFTConvolver m_convolverR1;
    FFTConvolver m_convolverL2;
    FFTConvolver m_convolverR2;

    mozilla::DelayBuffer m_delayLine;

    AudioFloatArray m_tempL1;
    AudioFloatArray m_tempR1;
    AudioFloatArray m_tempL2;
    AudioFloatArray m_tempR2;
};

} // namespace WebCore

#endif // HRTFPanner_h