Merge WebKit at r70209: Initial merge by Git

Change-Id: Id23a68efa36e9d1126bcce0b137872db00892c8e

1 files changed, 125 insertions, 0 deletions

diff --git a/WebCore/webaudio/BiquadProcessor.cpp b/WebCore/webaudio/BiquadProcessor.cpp
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+++ b/WebCore/webaudio/BiquadProcessor.cpp
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+/*
+ * 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 "config.h"
+
+#if ENABLE(WEB_AUDIO)
+
+#include "BiquadProcessor.h"
+
+#include "BiquadDSPKernel.h"
+
+namespace WebCore {
+
+BiquadProcessor::BiquadProcessor(FilterType type, double sampleRate, size_t numberOfChannels, bool autoInitialize)
+    : AudioDSPKernelProcessor(sampleRate, numberOfChannels)
+    , m_type(type)
+    , m_parameter1(0)
+    , m_parameter2(0)
+    , m_parameter3(0)
+    , m_filterCoefficientsDirty(true)
+{
+    double nyquist = 0.5 * this->sampleRate();
+    
+    switch (type) {
+    // Highpass and lowpass share the same parameters and only differ in filter type.
+    case LowPass2:
+    case HighPass2:
+        m_parameter1 = AudioParam::create("frequency", 350.0, 20.0, nyquist);
+        m_parameter2 = AudioParam::create("resonance", 0.0, -20.0, 20.0);
+        m_parameter3 = AudioParam::create("unused", 0.0, 0.0, 1.0);
+        break;
+
+    case Peaking:
+        m_parameter1 = AudioParam::create("frequency", 2500.0, 20.0, nyquist);
+        m_parameter2 = AudioParam::create("gain", 0.0, -20.0, 20.0);
+        m_parameter3 = AudioParam::create("Q", 0.5, 0.0, 1000.0);
+        break;
+    case Allpass:
+        m_parameter1 = AudioParam::create("frequency", 2500.0, 20.0, nyquist);
+        m_parameter2 = AudioParam::create("Q", 0.5, 0.0, 1000.0);
+        m_parameter3 = AudioParam::create("unused", 0.0, 0.0, 1.0);
+        break;
+    case LowShelf:
+        m_parameter1 = AudioParam::create("frequency", 80.0, 20.0, nyquist);
+        m_parameter2 = AudioParam::create("gain", 0.0, 0.0, 1.0);
+        m_parameter3 = AudioParam::create("unused", 0.0, 0.0, 1.0);
+        break;
+    case HighShelf:
+        m_parameter1 = AudioParam::create("frequency", 10000.0, 20.0, nyquist);
+        m_parameter2 = AudioParam::create("gain", 0.0, 0.0, 1.0);
+        m_parameter3 = AudioParam::create("unused", 0.0, 0.0, 1.0);
+        break;
+    }
+
+    if (autoInitialize)
+        initialize();
+}
+
+BiquadProcessor::~BiquadProcessor()
+{
+    if (isInitialized())
+        uninitialize();
+}
+
+PassOwnPtr<AudioDSPKernel> BiquadProcessor::createKernel()
+{
+    return adoptPtr(new BiquadDSPKernel(this));
+}
+
+void BiquadProcessor::process(AudioBus* source, AudioBus* destination, size_t framesToProcess)
+{
+    if (!isInitialized()) {
+        destination->zero();
+        return;
+    }
+        
+    // Deal with smoothing / de-zippering.  Start out assuming filter parameters are not changing.
+    // The BiquadDSPKernel objects rely on this value to see if they need to re-compute their internal filter coefficients.
+    m_filterCoefficientsDirty = false;
+    
+    if (m_hasJustReset) {
+        // Snap to exact values first time after reset, then smooth for subsequent changes.
+        m_parameter1->resetSmoothedValue();
+        m_parameter2->resetSmoothedValue();
+        m_parameter3->resetSmoothedValue();
+        m_filterCoefficientsDirty = true;
+        m_hasJustReset = false;
+    } else {
+        // Smooth all of the filter parameters.  If they haven't yet converged to their target value then mark coefficients as dirty.
+        bool isStable1 = m_parameter1->smooth();
+        bool isStable2 = m_parameter2->smooth();
+        bool isStable3 = m_parameter3->smooth();
+        if (!(isStable1 && isStable2 && isStable3))
+            m_filterCoefficientsDirty = true;
+    }
+        
+    // For each channel of our input, process using the corresponding BiquadDSPKernel into the output channel.
+    for (unsigned i = 0; i < m_kernels.size(); ++i)
+        m_kernels[i]->process(source->channel(i)->data(), destination->channel(i)->data(), framesToProcess);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)