Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 77 insertions, 0 deletions

diff --git a/Source/WebCore/webaudio/BiquadDSPKernel.cpp b/Source/WebCore/webaudio/BiquadDSPKernel.cpp
new file mode 100644
index 0000000..a4b28be
--- /dev/null
+++ b/Source/WebCore/webaudio/BiquadDSPKernel.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 "BiquadDSPKernel.h"
+
+#include "BiquadProcessor.h"
+
+namespace WebCore {
+
+void BiquadDSPKernel::process(const float* source, float* destination, size_t framesToProcess)
+{
+    ASSERT(source && destination && biquadProcessor());
+    
+    // Recompute filter coefficients if any of the parameters have changed.
+    // FIXME: as an optimization, implement a way that a Biquad object can simply copy its internal filter coefficients from another Biquad object.
+    // Then re-factor this code to only run for the first BiquadDSPKernel of each BiquadProcessor.
+    if (biquadProcessor()->filterCoefficientsDirty()) {
+        double value1 = biquadProcessor()->parameter1()->smoothedValue();
+        double value2 = biquadProcessor()->parameter2()->smoothedValue();
+        
+        // Convert from Hertz to normalized frequency 0 -> 1.
+        double nyquist = this->nyquist();
+        double normalizedValue1 = value1 / nyquist;
+
+        // Configure the biquad with the new filter parameters for the appropriate type of filter.
+        switch (biquadProcessor()->type()) {
+        case BiquadProcessor::LowPass2:
+            m_biquad.setLowpassParams(normalizedValue1, value2);
+            break;
+
+        case BiquadProcessor::HighPass2:
+            m_biquad.setHighpassParams(normalizedValue1, value2);
+            break;
+
+        case BiquadProcessor::LowShelf:
+            m_biquad.setLowShelfParams(normalizedValue1, value2);
+            break;
+
+        // FIXME: add other biquad filter types...
+        case BiquadProcessor::Peaking:
+        case BiquadProcessor::Allpass:
+        case BiquadProcessor::HighShelf:
+            break;
+        }
+    }
+
+    m_biquad.process(source, destination, framesToProcess);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)