Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 114 insertions, 0 deletions

diff --git a/Source/WebCore/webaudio/AudioDestinationNode.cpp b/Source/WebCore/webaudio/AudioDestinationNode.cpp
new file mode 100644
index 0000000..d2f4928
--- /dev/null
+++ b/Source/WebCore/webaudio/AudioDestinationNode.cpp
@@ -0,0 +1,114 @@
+/*
+ * 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 "AudioDestinationNode.h"
+
+#include "AudioBus.h"
+#include "AudioContext.h"
+#include "AudioNodeInput.h"
+#include "AudioNodeOutput.h"
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+AudioDestinationNode::AudioDestinationNode(AudioContext* context)
+    : AudioNode(context, AudioDestination::hardwareSampleRate())
+    , m_currentTime(0.0)
+{
+    addInput(adoptPtr(new AudioNodeInput(this)));
+    
+    setType(NodeTypeDestination);
+    
+    initialize();
+}
+
+AudioDestinationNode::~AudioDestinationNode()
+{
+    uninitialize();
+}
+
+void AudioDestinationNode::initialize()
+{
+    if (isInitialized())
+        return;
+
+    double hardwareSampleRate = AudioDestination::hardwareSampleRate();
+#ifndef NDEBUG    
+    fprintf(stderr, ">>>> hardwareSampleRate = %f\n", hardwareSampleRate);
+#endif
+    
+    m_destination = AudioDestination::create(*this, hardwareSampleRate);
+    m_destination->start();
+    
+    AudioNode::initialize();
+}
+
+void AudioDestinationNode::uninitialize()
+{
+    if (!isInitialized())
+        return;
+
+    m_destination->stop();
+
+    AudioNode::uninitialize();
+}
+
+// The audio hardware calls us back here to gets its input stream.
+void AudioDestinationNode::provideInput(AudioBus* destinationBus, size_t numberOfFrames)
+{
+    context()->setAudioThread(currentThread());
+    
+    if (!context()->isRunnable()) {
+        destinationBus->zero();
+        return;
+    }
+
+    // Let the context take care of any business at the start of each render quantum.
+    context()->handlePreRenderTasks();
+
+    // This will cause the node(s) connected to us to process, which in turn will pull on their input(s),
+    // all the way backwards through the rendering graph.
+    AudioBus* renderedBus = input(0)->pull(destinationBus, numberOfFrames);
+    
+    if (!renderedBus)
+        destinationBus->zero();
+    else if (renderedBus != destinationBus) {
+        // in-place processing was not possible - so copy
+        destinationBus->copyFrom(*renderedBus);
+    }
+
+    // Let the context take care of any business at the end of each render quantum.
+    context()->handlePostRenderTasks();
+    
+    // Advance current time.
+    m_currentTime += numberOfFrames / sampleRate();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)