Add m-esr52 at 52.6.0

1 files changed, 324 insertions, 0 deletions

diff --git a/dom/media/webaudio/blink/HRTFPanner.cpp b/dom/media/webaudio/blink/HRTFPanner.cpp
new file mode 100644
index 000000000..c97ce4767
--- /dev/null
+++ b/dom/media/webaudio/blink/HRTFPanner.cpp
@@ -0,0 +1,324 @@
+/*
+ * 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
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "HRTFPanner.h"
+#include "HRTFDatabaseLoader.h"
+
+#include "FFTConvolver.h"
+#include "HRTFDatabase.h"
+#include "AudioBlock.h"
+
+using namespace std;
+using namespace mozilla;
+using dom::ChannelInterpretation;
+
+namespace WebCore {
+
+// The value of 2 milliseconds is larger than the largest delay which exists in any HRTFKernel from the default HRTFDatabase (0.0136 seconds).
+// We ASSERT the delay values used in process() with this value.
+const double MaxDelayTimeSeconds = 0.002;
+
+const int UninitializedAzimuth = -1;
+const unsigned RenderingQuantum = WEBAUDIO_BLOCK_SIZE;
+
+HRTFPanner::HRTFPanner(float sampleRate, already_AddRefed<HRTFDatabaseLoader> databaseLoader)
+    : m_databaseLoader(databaseLoader)
+    , m_sampleRate(sampleRate)
+    , m_crossfadeSelection(CrossfadeSelection1)
+    , m_azimuthIndex1(UninitializedAzimuth)
+    , m_azimuthIndex2(UninitializedAzimuth)
+    // m_elevation1 and m_elevation2 are initialized in pan()
+    , m_crossfadeX(0)
+    , m_crossfadeIncr(0)
+    , m_convolverL1(HRTFElevation::fftSizeForSampleRate(sampleRate))
+    , m_convolverR1(m_convolverL1.fftSize())
+    , m_convolverL2(m_convolverL1.fftSize())
+    , m_convolverR2(m_convolverL1.fftSize())
+    , m_delayLine(MaxDelayTimeSeconds * sampleRate, 1.0)
+{
+    MOZ_ASSERT(m_databaseLoader);
+    MOZ_COUNT_CTOR(HRTFPanner);
+}
+
+HRTFPanner::~HRTFPanner()
+{
+    MOZ_COUNT_DTOR(HRTFPanner);
+}
+
+size_t HRTFPanner::sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+    size_t amount = aMallocSizeOf(this);
+
+    // NB: m_databaseLoader can be shared, so it is not measured here
+    amount += m_convolverL1.sizeOfExcludingThis(aMallocSizeOf);
+    amount += m_convolverR1.sizeOfExcludingThis(aMallocSizeOf);
+    amount += m_convolverL2.sizeOfExcludingThis(aMallocSizeOf);
+    amount += m_convolverR2.sizeOfExcludingThis(aMallocSizeOf);
+    amount += m_delayLine.SizeOfExcludingThis(aMallocSizeOf);
+
+    return amount;
+}
+
+void HRTFPanner::reset()
+{
+    m_azimuthIndex1 = UninitializedAzimuth;
+    m_azimuthIndex2 = UninitializedAzimuth;
+    // m_elevation1 and m_elevation2 are initialized in pan()
+    m_crossfadeSelection = CrossfadeSelection1;
+    m_crossfadeX = 0.0f;
+    m_crossfadeIncr = 0.0f;
+    m_convolverL1.reset();
+    m_convolverR1.reset();
+    m_convolverL2.reset();
+    m_convolverR2.reset();
+    m_delayLine.Reset();
+}
+
+int HRTFPanner::calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend)
+{
+    // Convert the azimuth angle from the range -180 -> +180 into the range 0 -> 360.
+    // The azimuth index may then be calculated from this positive value.
+    if (azimuth < 0)
+        azimuth += 360.0;
+
+    HRTFDatabase* database = m_databaseLoader->database();
+    MOZ_ASSERT(database);
+
+    int numberOfAzimuths = database->numberOfAzimuths();
+    const double angleBetweenAzimuths = 360.0 / numberOfAzimuths;
+
+    // Calculate the azimuth index and the blend (0 -> 1) for interpolation.
+    double desiredAzimuthIndexFloat = azimuth / angleBetweenAzimuths;
+    int desiredAzimuthIndex = static_cast<int>(desiredAzimuthIndexFloat);
+    azimuthBlend = desiredAzimuthIndexFloat - static_cast<double>(desiredAzimuthIndex);
+
+    // We don't immediately start using this azimuth index, but instead approach this index from the last index we rendered at.
+    // This minimizes the clicks and graininess for moving sources which occur otherwise.
+    desiredAzimuthIndex = max(0, desiredAzimuthIndex);
+    desiredAzimuthIndex = min(numberOfAzimuths - 1, desiredAzimuthIndex);
+    return desiredAzimuthIndex;
+}
+
+void HRTFPanner::pan(double desiredAzimuth, double elevation, const AudioBlock* inputBus, AudioBlock* outputBus)
+{
+#ifdef DEBUG
+    unsigned numInputChannels =
+        inputBus->IsNull() ? 0 : inputBus->ChannelCount();
+
+    MOZ_ASSERT(numInputChannels <= 2);
+    MOZ_ASSERT(inputBus->GetDuration() == WEBAUDIO_BLOCK_SIZE);
+#endif
+
+    bool isOutputGood = outputBus && outputBus->ChannelCount() == 2 && outputBus->GetDuration() == WEBAUDIO_BLOCK_SIZE;
+    MOZ_ASSERT(isOutputGood);
+
+    if (!isOutputGood) {
+        if (outputBus)
+            outputBus->SetNull(outputBus->GetDuration());
+        return;
+    }
+
+    HRTFDatabase* database = m_databaseLoader->database();
+    if (!database) { // not yet loaded
+        outputBus->SetNull(outputBus->GetDuration());
+        return;
+    }
+
+    // IRCAM HRTF azimuths values from the loaded database is reversed from the panner's notion of azimuth.
+    double azimuth = -desiredAzimuth;
+
+    bool isAzimuthGood = azimuth >= -180.0 && azimuth <= 180.0;
+    MOZ_ASSERT(isAzimuthGood);
+    if (!isAzimuthGood) {
+        outputBus->SetNull(outputBus->GetDuration());
+        return;
+    }
+
+    // Normally, we'll just be dealing with mono sources.
+    // If we have a stereo input, implement stereo panning with left source processed by left HRTF, and right source by right HRTF.
+
+    // Get destination pointers.
+    float* destinationL =
+        static_cast<float*>(const_cast<void*>(outputBus->mChannelData[0]));
+    float* destinationR =
+        static_cast<float*>(const_cast<void*>(outputBus->mChannelData[1]));
+
+    double azimuthBlend;
+    int desiredAzimuthIndex = calculateDesiredAzimuthIndexAndBlend(azimuth, azimuthBlend);
+
+    // Initially snap azimuth and elevation values to first values encountered.
+    if (m_azimuthIndex1 == UninitializedAzimuth) {
+        m_azimuthIndex1 = desiredAzimuthIndex;
+        m_elevation1 = elevation;
+    }
+    if (m_azimuthIndex2 == UninitializedAzimuth) {
+        m_azimuthIndex2 = desiredAzimuthIndex;
+        m_elevation2 = elevation;
+    }
+
+    // Cross-fade / transition over a period of around 45 milliseconds.
+    // This is an empirical value tuned to be a reasonable trade-off between
+    // smoothness and speed.
+    const double fadeFrames = sampleRate() <= 48000 ? 2048 : 4096;
+
+    // Check for azimuth and elevation changes, initiating a cross-fade if needed.
+    if (!m_crossfadeX && m_crossfadeSelection == CrossfadeSelection1) {
+        if (desiredAzimuthIndex != m_azimuthIndex1 || elevation != m_elevation1) {
+            // Cross-fade from 1 -> 2
+            m_crossfadeIncr = 1 / fadeFrames;
+            m_azimuthIndex2 = desiredAzimuthIndex;
+            m_elevation2 = elevation;
+        }
+    }
+    if (m_crossfadeX == 1 && m_crossfadeSelection == CrossfadeSelection2) {
+        if (desiredAzimuthIndex != m_azimuthIndex2 || elevation != m_elevation2) {
+            // Cross-fade from 2 -> 1
+            m_crossfadeIncr = -1 / fadeFrames;
+            m_azimuthIndex1 = desiredAzimuthIndex;
+            m_elevation1 = elevation;
+        }
+    }
+
+    // Get the HRTFKernels and interpolated delays.
+    HRTFKernel* kernelL1;
+    HRTFKernel* kernelR1;
+    HRTFKernel* kernelL2;
+    HRTFKernel* kernelR2;
+    double frameDelayL1;
+    double frameDelayR1;
+    double frameDelayL2;
+    double frameDelayR2;
+    database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex1, m_elevation1, kernelL1, kernelR1, frameDelayL1, frameDelayR1);
+    database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex2, m_elevation2, kernelL2, kernelR2, frameDelayL2, frameDelayR2);
+
+    bool areKernelsGood = kernelL1 && kernelR1 && kernelL2 && kernelR2;
+    MOZ_ASSERT(areKernelsGood);
+    if (!areKernelsGood) {
+        outputBus->SetNull(outputBus->GetDuration());
+        return;
+    }
+
+    MOZ_ASSERT(frameDelayL1 / sampleRate() < MaxDelayTimeSeconds && frameDelayR1 / sampleRate() < MaxDelayTimeSeconds);
+    MOZ_ASSERT(frameDelayL2 / sampleRate() < MaxDelayTimeSeconds && frameDelayR2 / sampleRate() < MaxDelayTimeSeconds);
+
+    // Crossfade inter-aural delays based on transitions.
+    double frameDelaysL[WEBAUDIO_BLOCK_SIZE];
+    double frameDelaysR[WEBAUDIO_BLOCK_SIZE];
+    {
+      float x = m_crossfadeX;
+      float incr = m_crossfadeIncr;
+      for (unsigned i = 0; i < WEBAUDIO_BLOCK_SIZE; ++i) {
+        frameDelaysL[i] = (1 - x) * frameDelayL1 + x * frameDelayL2;
+        frameDelaysR[i] = (1 - x) * frameDelayR1 + x * frameDelayR2;
+        x += incr;
+      }
+    }
+
+    // First run through delay lines for inter-aural time difference.
+    m_delayLine.Write(*inputBus);
+    // "Speakers" means a mono input is read into both outputs (with possibly
+    // different delays).
+    m_delayLine.ReadChannel(frameDelaysL, outputBus, 0,
+                            ChannelInterpretation::Speakers);
+    m_delayLine.ReadChannel(frameDelaysR, outputBus, 1,
+                            ChannelInterpretation::Speakers);
+    m_delayLine.NextBlock();
+
+    bool needsCrossfading = m_crossfadeIncr;
+
+    const float* convolutionDestinationL1;
+    const float* convolutionDestinationR1;
+    const float* convolutionDestinationL2;
+    const float* convolutionDestinationR2;
+
+    // Now do the convolutions.
+    // Note that we avoid doing convolutions on both sets of convolvers if we're not currently cross-fading.
+
+    if (m_crossfadeSelection == CrossfadeSelection1 || needsCrossfading) {
+        convolutionDestinationL1 =
+            m_convolverL1.process(kernelL1->fftFrame(), destinationL);
+        convolutionDestinationR1 =
+            m_convolverR1.process(kernelR1->fftFrame(), destinationR);
+    }
+
+    if (m_crossfadeSelection == CrossfadeSelection2 || needsCrossfading) {
+        convolutionDestinationL2 =
+            m_convolverL2.process(kernelL2->fftFrame(), destinationL);
+        convolutionDestinationR2 =
+            m_convolverR2.process(kernelR2->fftFrame(), destinationR);
+    }
+
+    if (needsCrossfading) {
+        // Apply linear cross-fade.
+        float x = m_crossfadeX;
+        float incr = m_crossfadeIncr;
+        for (unsigned i = 0; i < WEBAUDIO_BLOCK_SIZE; ++i) {
+            destinationL[i] = (1 - x) * convolutionDestinationL1[i] + x * convolutionDestinationL2[i];
+            destinationR[i] = (1 - x) * convolutionDestinationR1[i] + x * convolutionDestinationR2[i];
+            x += incr;
+        }
+        // Update cross-fade value from local.
+        m_crossfadeX = x;
+
+        if (m_crossfadeIncr > 0 && fabs(m_crossfadeX - 1) < m_crossfadeIncr) {
+            // We've fully made the crossfade transition from 1 -> 2.
+            m_crossfadeSelection = CrossfadeSelection2;
+            m_crossfadeX = 1;
+            m_crossfadeIncr = 0;
+        } else if (m_crossfadeIncr < 0 && fabs(m_crossfadeX) < -m_crossfadeIncr) {
+            // We've fully made the crossfade transition from 2 -> 1.
+            m_crossfadeSelection = CrossfadeSelection1;
+            m_crossfadeX = 0;
+            m_crossfadeIncr = 0;
+        }
+    } else {
+        const float* sourceL;
+        const float* sourceR;
+        if (m_crossfadeSelection == CrossfadeSelection1) {
+            sourceL = convolutionDestinationL1;
+            sourceR = convolutionDestinationR1;
+        } else {
+            sourceL = convolutionDestinationL2;
+            sourceR = convolutionDestinationR2;
+        }
+        PodCopy(destinationL, sourceL, WEBAUDIO_BLOCK_SIZE);
+        PodCopy(destinationR, sourceR, WEBAUDIO_BLOCK_SIZE);
+    }
+}
+
+int HRTFPanner::maxTailFrames() const
+{
+    // Although the ideal tail time would be the length of the impulse
+    // response, there is additional tail time from the approximations in the
+    // implementation.  Because HRTFPanner is implemented with a DelayKernel
+    // and a FFTConvolver, the tailTime of the HRTFPanner is the sum of the
+    // tailTime of the DelayKernel and the tailTime of the FFTConvolver.  The
+    // FFTs of the convolver are fftSize(), half of which is latency, but this
+    // is aligned with blocks and so is reduced by the one block which is
+    // processed immediately.
+    return m_delayLine.MaxDelayTicks() +
+        m_convolverL1.fftSize()/2 + m_convolverL1.latencyFrames();
+}
+
+} // namespace WebCore