diff -r 000000000000 -r 6474c204b198 content/media/webaudio/blink/DirectConvolver.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/webaudio/blink/DirectConvolver.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,347 @@
+/*
+ * Copyright (C) 2012 Intel 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "DirectConvolver.h"
+#include "mozilla/PodOperations.h"
+
+using namespace mozilla;
+
+namespace WebCore {
+
+DirectConvolver::DirectConvolver(size_t inputBlockSize)
+    : m_inputBlockSize(inputBlockSize)
+{
+  m_buffer.SetLength(inputBlockSize * 2);
+  PodZero(m_buffer.Elements(), inputBlockSize * 2);
+}
+
+void DirectConvolver::process(const nsTArray<float>* convolutionKernel, const float* sourceP, float* destP, size_t framesToProcess)
+{
+    MOZ_ASSERT(framesToProcess == m_inputBlockSize);
+    if (framesToProcess != m_inputBlockSize)
+        return;
+
+    // Only support kernelSize <= m_inputBlockSize
+    size_t kernelSize = convolutionKernel->Length();
+    MOZ_ASSERT(kernelSize <= m_inputBlockSize);
+    if (kernelSize > m_inputBlockSize)
+        return;
+
+    const float* kernelP = convolutionKernel->Elements();
+
+    // Sanity check
+    bool isCopyGood = kernelP && sourceP && destP && m_buffer.Elements();
+    MOZ_ASSERT(isCopyGood);
+    if (!isCopyGood)
+        return;
+
+    float* inputP = m_buffer.Elements() + m_inputBlockSize;
+
+    // Copy samples to 2nd half of input buffer.
+    memcpy(inputP, sourceP, sizeof(float) * framesToProcess);
+
+    // FIXME: The macro can be further optimized to avoid pipeline stalls. One possibility is to maintain 4 separate sums and change the macro to CONVOLVE_FOUR_SAMPLES.
+#define CONVOLVE_ONE_SAMPLE             \
+    sum += inputP[i - j] * kernelP[j];  \
+    j++;
+
+    size_t i = 0;
+    while (i < framesToProcess) {
+        size_t j = 0;
+        float sum = 0;
+        
+        // FIXME: SSE optimization may be applied here.
+        if (kernelSize == 32) {
+            CONVOLVE_ONE_SAMPLE // 1
+            CONVOLVE_ONE_SAMPLE // 2
+            CONVOLVE_ONE_SAMPLE // 3
+            CONVOLVE_ONE_SAMPLE // 4
+            CONVOLVE_ONE_SAMPLE // 5
+            CONVOLVE_ONE_SAMPLE // 6
+            CONVOLVE_ONE_SAMPLE // 7
+            CONVOLVE_ONE_SAMPLE // 8
+            CONVOLVE_ONE_SAMPLE // 9
+            CONVOLVE_ONE_SAMPLE // 10
+
+            CONVOLVE_ONE_SAMPLE // 11
+            CONVOLVE_ONE_SAMPLE // 12
+            CONVOLVE_ONE_SAMPLE // 13
+            CONVOLVE_ONE_SAMPLE // 14
+            CONVOLVE_ONE_SAMPLE // 15
+            CONVOLVE_ONE_SAMPLE // 16
+            CONVOLVE_ONE_SAMPLE // 17
+            CONVOLVE_ONE_SAMPLE // 18
+            CONVOLVE_ONE_SAMPLE // 19
+            CONVOLVE_ONE_SAMPLE // 20
+
+            CONVOLVE_ONE_SAMPLE // 21
+            CONVOLVE_ONE_SAMPLE // 22
+            CONVOLVE_ONE_SAMPLE // 23
+            CONVOLVE_ONE_SAMPLE // 24
+            CONVOLVE_ONE_SAMPLE // 25
+            CONVOLVE_ONE_SAMPLE // 26
+            CONVOLVE_ONE_SAMPLE // 27
+            CONVOLVE_ONE_SAMPLE // 28
+            CONVOLVE_ONE_SAMPLE // 29
+            CONVOLVE_ONE_SAMPLE // 30
+
+            CONVOLVE_ONE_SAMPLE // 31
+            CONVOLVE_ONE_SAMPLE // 32
+
+        } else if (kernelSize == 64) {
+            CONVOLVE_ONE_SAMPLE // 1
+            CONVOLVE_ONE_SAMPLE // 2
+            CONVOLVE_ONE_SAMPLE // 3
+            CONVOLVE_ONE_SAMPLE // 4
+            CONVOLVE_ONE_SAMPLE // 5
+            CONVOLVE_ONE_SAMPLE // 6
+            CONVOLVE_ONE_SAMPLE // 7
+            CONVOLVE_ONE_SAMPLE // 8
+            CONVOLVE_ONE_SAMPLE // 9
+            CONVOLVE_ONE_SAMPLE // 10
+
+            CONVOLVE_ONE_SAMPLE // 11
+            CONVOLVE_ONE_SAMPLE // 12
+            CONVOLVE_ONE_SAMPLE // 13
+            CONVOLVE_ONE_SAMPLE // 14
+            CONVOLVE_ONE_SAMPLE // 15
+            CONVOLVE_ONE_SAMPLE // 16
+            CONVOLVE_ONE_SAMPLE // 17
+            CONVOLVE_ONE_SAMPLE // 18
+            CONVOLVE_ONE_SAMPLE // 19
+            CONVOLVE_ONE_SAMPLE // 20
+
+            CONVOLVE_ONE_SAMPLE // 21
+            CONVOLVE_ONE_SAMPLE // 22
+            CONVOLVE_ONE_SAMPLE // 23
+            CONVOLVE_ONE_SAMPLE // 24
+            CONVOLVE_ONE_SAMPLE // 25
+            CONVOLVE_ONE_SAMPLE // 26
+            CONVOLVE_ONE_SAMPLE // 27
+            CONVOLVE_ONE_SAMPLE // 28
+            CONVOLVE_ONE_SAMPLE // 29
+            CONVOLVE_ONE_SAMPLE // 30
+
+            CONVOLVE_ONE_SAMPLE // 31
+            CONVOLVE_ONE_SAMPLE // 32
+            CONVOLVE_ONE_SAMPLE // 33
+            CONVOLVE_ONE_SAMPLE // 34
+            CONVOLVE_ONE_SAMPLE // 35
+            CONVOLVE_ONE_SAMPLE // 36
+            CONVOLVE_ONE_SAMPLE // 37
+            CONVOLVE_ONE_SAMPLE // 38
+            CONVOLVE_ONE_SAMPLE // 39
+            CONVOLVE_ONE_SAMPLE // 40
+
+            CONVOLVE_ONE_SAMPLE // 41
+            CONVOLVE_ONE_SAMPLE // 42
+            CONVOLVE_ONE_SAMPLE // 43
+            CONVOLVE_ONE_SAMPLE // 44
+            CONVOLVE_ONE_SAMPLE // 45
+            CONVOLVE_ONE_SAMPLE // 46
+            CONVOLVE_ONE_SAMPLE // 47
+            CONVOLVE_ONE_SAMPLE // 48
+            CONVOLVE_ONE_SAMPLE // 49
+            CONVOLVE_ONE_SAMPLE // 50
+
+            CONVOLVE_ONE_SAMPLE // 51
+            CONVOLVE_ONE_SAMPLE // 52
+            CONVOLVE_ONE_SAMPLE // 53
+            CONVOLVE_ONE_SAMPLE // 54
+            CONVOLVE_ONE_SAMPLE // 55
+            CONVOLVE_ONE_SAMPLE // 56
+            CONVOLVE_ONE_SAMPLE // 57
+            CONVOLVE_ONE_SAMPLE // 58
+            CONVOLVE_ONE_SAMPLE // 59
+            CONVOLVE_ONE_SAMPLE // 60
+
+            CONVOLVE_ONE_SAMPLE // 61
+            CONVOLVE_ONE_SAMPLE // 62
+            CONVOLVE_ONE_SAMPLE // 63
+            CONVOLVE_ONE_SAMPLE // 64
+
+        } else if (kernelSize == 128) {
+            CONVOLVE_ONE_SAMPLE // 1
+            CONVOLVE_ONE_SAMPLE // 2
+            CONVOLVE_ONE_SAMPLE // 3
+            CONVOLVE_ONE_SAMPLE // 4
+            CONVOLVE_ONE_SAMPLE // 5
+            CONVOLVE_ONE_SAMPLE // 6
+            CONVOLVE_ONE_SAMPLE // 7
+            CONVOLVE_ONE_SAMPLE // 8
+            CONVOLVE_ONE_SAMPLE // 9
+            CONVOLVE_ONE_SAMPLE // 10
+
+            CONVOLVE_ONE_SAMPLE // 11
+            CONVOLVE_ONE_SAMPLE // 12
+            CONVOLVE_ONE_SAMPLE // 13
+            CONVOLVE_ONE_SAMPLE // 14
+            CONVOLVE_ONE_SAMPLE // 15
+            CONVOLVE_ONE_SAMPLE // 16
+            CONVOLVE_ONE_SAMPLE // 17
+            CONVOLVE_ONE_SAMPLE // 18
+            CONVOLVE_ONE_SAMPLE // 19
+            CONVOLVE_ONE_SAMPLE // 20
+
+            CONVOLVE_ONE_SAMPLE // 21
+            CONVOLVE_ONE_SAMPLE // 22
+            CONVOLVE_ONE_SAMPLE // 23
+            CONVOLVE_ONE_SAMPLE // 24
+            CONVOLVE_ONE_SAMPLE // 25
+            CONVOLVE_ONE_SAMPLE // 26
+            CONVOLVE_ONE_SAMPLE // 27
+            CONVOLVE_ONE_SAMPLE // 28
+            CONVOLVE_ONE_SAMPLE // 29
+            CONVOLVE_ONE_SAMPLE // 30
+
+            CONVOLVE_ONE_SAMPLE // 31
+            CONVOLVE_ONE_SAMPLE // 32
+            CONVOLVE_ONE_SAMPLE // 33
+            CONVOLVE_ONE_SAMPLE // 34
+            CONVOLVE_ONE_SAMPLE // 35
+            CONVOLVE_ONE_SAMPLE // 36
+            CONVOLVE_ONE_SAMPLE // 37
+            CONVOLVE_ONE_SAMPLE // 38
+            CONVOLVE_ONE_SAMPLE // 39
+            CONVOLVE_ONE_SAMPLE // 40
+
+            CONVOLVE_ONE_SAMPLE // 41
+            CONVOLVE_ONE_SAMPLE // 42
+            CONVOLVE_ONE_SAMPLE // 43
+            CONVOLVE_ONE_SAMPLE // 44
+            CONVOLVE_ONE_SAMPLE // 45
+            CONVOLVE_ONE_SAMPLE // 46
+            CONVOLVE_ONE_SAMPLE // 47
+            CONVOLVE_ONE_SAMPLE // 48
+            CONVOLVE_ONE_SAMPLE // 49
+            CONVOLVE_ONE_SAMPLE // 50
+
+            CONVOLVE_ONE_SAMPLE // 51
+            CONVOLVE_ONE_SAMPLE // 52
+            CONVOLVE_ONE_SAMPLE // 53
+            CONVOLVE_ONE_SAMPLE // 54
+            CONVOLVE_ONE_SAMPLE // 55
+            CONVOLVE_ONE_SAMPLE // 56
+            CONVOLVE_ONE_SAMPLE // 57
+            CONVOLVE_ONE_SAMPLE // 58
+            CONVOLVE_ONE_SAMPLE // 59
+            CONVOLVE_ONE_SAMPLE // 60
+
+            CONVOLVE_ONE_SAMPLE // 61
+            CONVOLVE_ONE_SAMPLE // 62
+            CONVOLVE_ONE_SAMPLE // 63
+            CONVOLVE_ONE_SAMPLE // 64
+            CONVOLVE_ONE_SAMPLE // 65
+            CONVOLVE_ONE_SAMPLE // 66
+            CONVOLVE_ONE_SAMPLE // 67
+            CONVOLVE_ONE_SAMPLE // 68
+            CONVOLVE_ONE_SAMPLE // 69
+            CONVOLVE_ONE_SAMPLE // 70
+
+            CONVOLVE_ONE_SAMPLE // 71
+            CONVOLVE_ONE_SAMPLE // 72
+            CONVOLVE_ONE_SAMPLE // 73
+            CONVOLVE_ONE_SAMPLE // 74
+            CONVOLVE_ONE_SAMPLE // 75
+            CONVOLVE_ONE_SAMPLE // 76
+            CONVOLVE_ONE_SAMPLE // 77
+            CONVOLVE_ONE_SAMPLE // 78
+            CONVOLVE_ONE_SAMPLE // 79
+            CONVOLVE_ONE_SAMPLE // 80
+
+            CONVOLVE_ONE_SAMPLE // 81
+            CONVOLVE_ONE_SAMPLE // 82
+            CONVOLVE_ONE_SAMPLE // 83
+            CONVOLVE_ONE_SAMPLE // 84
+            CONVOLVE_ONE_SAMPLE // 85
+            CONVOLVE_ONE_SAMPLE // 86
+            CONVOLVE_ONE_SAMPLE // 87
+            CONVOLVE_ONE_SAMPLE // 88
+            CONVOLVE_ONE_SAMPLE // 89
+            CONVOLVE_ONE_SAMPLE // 90
+
+            CONVOLVE_ONE_SAMPLE // 91
+            CONVOLVE_ONE_SAMPLE // 92
+            CONVOLVE_ONE_SAMPLE // 93
+            CONVOLVE_ONE_SAMPLE // 94
+            CONVOLVE_ONE_SAMPLE // 95
+            CONVOLVE_ONE_SAMPLE // 96
+            CONVOLVE_ONE_SAMPLE // 97
+            CONVOLVE_ONE_SAMPLE // 98
+            CONVOLVE_ONE_SAMPLE // 99
+            CONVOLVE_ONE_SAMPLE // 100
+
+            CONVOLVE_ONE_SAMPLE // 101
+            CONVOLVE_ONE_SAMPLE // 102
+            CONVOLVE_ONE_SAMPLE // 103
+            CONVOLVE_ONE_SAMPLE // 104
+            CONVOLVE_ONE_SAMPLE // 105
+            CONVOLVE_ONE_SAMPLE // 106
+            CONVOLVE_ONE_SAMPLE // 107
+            CONVOLVE_ONE_SAMPLE // 108
+            CONVOLVE_ONE_SAMPLE // 109
+            CONVOLVE_ONE_SAMPLE // 110
+
+            CONVOLVE_ONE_SAMPLE // 111
+            CONVOLVE_ONE_SAMPLE // 112
+            CONVOLVE_ONE_SAMPLE // 113
+            CONVOLVE_ONE_SAMPLE // 114
+            CONVOLVE_ONE_SAMPLE // 115
+            CONVOLVE_ONE_SAMPLE // 116
+            CONVOLVE_ONE_SAMPLE // 117
+            CONVOLVE_ONE_SAMPLE // 118
+            CONVOLVE_ONE_SAMPLE // 119
+            CONVOLVE_ONE_SAMPLE // 120
+
+            CONVOLVE_ONE_SAMPLE // 121
+            CONVOLVE_ONE_SAMPLE // 122
+            CONVOLVE_ONE_SAMPLE // 123
+            CONVOLVE_ONE_SAMPLE // 124
+            CONVOLVE_ONE_SAMPLE // 125
+            CONVOLVE_ONE_SAMPLE // 126
+            CONVOLVE_ONE_SAMPLE // 127
+            CONVOLVE_ONE_SAMPLE // 128
+        } else {
+            while (j < kernelSize) {
+                // Non-optimized using actual while loop.
+                CONVOLVE_ONE_SAMPLE
+            }
+        }
+        destP[i++] = sum;
+    }
+
+    // Copy 2nd half of input buffer to 1st half.
+    memcpy(m_buffer.Elements(), inputP, sizeof(float) * framesToProcess);
+}
+
+void DirectConvolver::reset()
+{
+    PodZero(m_buffer.Elements(), m_buffer.Length());
+}
+
+} // namespace WebCore