1 files changed, 115 insertions, 0 deletions
diff --git a/WebCore/webaudio/AudioDestinationNode.cpp b/WebCore/webaudio/AudioDestinationNode.cpp
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+++ b/WebCore/webaudio/AudioDestinationNode.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 "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();
+    
+    m_isInitialized = true;
+}
+
+void AudioDestinationNode::uninitialize()
+{
+    if (!isInitialized())
+        return;
+
+    m_destination->stop();
+
+    m_isInitialized = false;
+}
+
+// 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;
+    }
+
+    // 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)