Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 110 insertions, 0 deletions

diff --git a/Source/WebCore/webaudio/AudioBuffer.cpp b/Source/WebCore/webaudio/AudioBuffer.cpp
new file mode 100644
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+++ b/Source/WebCore/webaudio/AudioBuffer.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 "AudioBuffer.h"
+
+#include "AudioBus.h"
+#include "AudioFileReader.h"
+#include "ExceptionCode.h"
+#include <wtf/OwnPtr.h>
+
+namespace WebCore {
+
+PassRefPtr<AudioBuffer> AudioBuffer::create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
+{
+    if (sampleRate < 22050 || sampleRate > 96000 || numberOfChannels > 10 || !numberOfFrames)
+        return 0;
+    
+    return adoptRef(new AudioBuffer(numberOfChannels, numberOfFrames, sampleRate));
+}
+
+PassRefPtr<AudioBuffer> AudioBuffer::createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
+{
+    OwnPtr<AudioBus> bus = createBusFromInMemoryAudioFile(data, dataSize, mixToMono, sampleRate);
+    if (bus.get())
+        return adoptRef(new AudioBuffer(bus.get()));
+
+    return 0;
+}
+
+AudioBuffer::AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
+    : m_gain(1.0)
+    , m_sampleRate(sampleRate)
+    , m_length(numberOfFrames)
+{
+    m_channels.reserveCapacity(numberOfChannels);
+
+    for (unsigned i = 0; i < numberOfChannels; ++i) {
+        RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
+        m_channels.append(channelDataArray);
+    }
+}
+
+AudioBuffer::AudioBuffer(AudioBus* bus)
+    : m_gain(1.0)
+    , m_sampleRate(bus->sampleRate())
+    , m_length(bus->length())
+{
+    // Copy audio data from the bus to the Float32Arrays we manage.
+    unsigned numberOfChannels = bus->numberOfChannels();
+    m_channels.reserveCapacity(numberOfChannels);
+    for (unsigned i = 0; i < numberOfChannels; ++i) {
+        RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
+        channelDataArray->setRange(bus->channel(i)->data(), m_length, 0);
+        m_channels.append(channelDataArray);
+    }
+}
+
+void AudioBuffer::releaseMemory()
+{
+    m_channels.clear();
+}
+
+Float32Array* AudioBuffer::getChannelData(unsigned channelIndex)
+{
+    if (channelIndex >= m_channels.size())
+        return 0;
+
+    return m_channels[channelIndex].get();
+}
+
+void AudioBuffer::zero()
+{
+    for (unsigned i = 0; i < m_channels.size(); ++i) {
+        if (getChannelData(i))
+            getChannelData(i)->zeroRange(0, length());
+    }
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)