1 files changed, 104 insertions, 0 deletions
diff --git a/Source/WebCore/platform/audio/AudioChannel.cpp b/Source/WebCore/platform/audio/AudioChannel.cpp
new file mode 100644
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+++ b/Source/WebCore/platform/audio/AudioChannel.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.
+ * 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 "config.h"
+
+#if ENABLE(WEB_AUDIO)
+
+#include "AudioChannel.h"
+
+#include "VectorMath.h"
+#include <algorithm>
+#include <math.h>
+#include <wtf/OwnPtr.h>
+
+namespace WebCore {
+
+using namespace VectorMath;
+
+void AudioChannel::scale(double scale)
+{
+    float s = static_cast<float>(scale);
+    vsmul(data(), 1, &s, data(), 1, length());
+}
+
+void AudioChannel::copyFrom(const AudioChannel* sourceChannel)
+{
+    bool isSafe = (sourceChannel && sourceChannel->length() >= length());
+    ASSERT(isSafe);
+    if (!isSafe)
+        return;
+
+    memcpy(data(), sourceChannel->data(), sizeof(float) * length());
+}
+
+void AudioChannel::copyFromRange(const AudioChannel* sourceChannel, unsigned startFrame, unsigned endFrame)
+{
+    // Check that range is safe for reading from sourceChannel.
+    bool isRangeSafe = sourceChannel && startFrame < endFrame && endFrame <= sourceChannel->length();
+    ASSERT(isRangeSafe);
+    if (!isRangeSafe)
+        return;
+
+    // Check that this channel has enough space.
+    size_t rangeLength = endFrame - startFrame;
+    bool isRangeLengthSafe = rangeLength <= length();
+    ASSERT(isRangeLengthSafe);
+    if (!isRangeLengthSafe)
+        return;
+
+    const float* source = sourceChannel->data();
+    float* destination = data();
+    memcpy(destination, source + startFrame, sizeof(float) * rangeLength);
+}
+
+void AudioChannel::sumFrom(const AudioChannel* sourceChannel)
+{
+    bool isSafe = sourceChannel && sourceChannel->length() >= length();
+    ASSERT(isSafe);
+    if (!isSafe)
+        return;
+
+    vadd(data(), 1, sourceChannel->data(), 1, data(), 1, length());
+}
+
+float AudioChannel::maxAbsValue() const
+{
+    const float* p = data();
+    int n = length();
+
+    float max = 0.0f;
+    while (n--)
+        max = std::max(max, fabsf(*p++));
+
+    return max;
+}
+
+} // WebCore
+
+#endif // ENABLE(WEB_AUDIO)