Merge WebKit at r70209: Initial merge by Git

Change-Id: Id23a68efa36e9d1126bcce0b137872db00892c8e

1 files changed, 146 insertions, 0 deletions

diff --git a/WebCore/webaudio/AudioBasicProcessorNode.cpp b/WebCore/webaudio/AudioBasicProcessorNode.cpp
new file mode 100644
index 0000000..cadaa73
--- /dev/null
+++ b/WebCore/webaudio/AudioBasicProcessorNode.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.
+ *
+ * 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 "AudioBasicProcessorNode.h"
+
+#include "AudioBus.h"
+#include "AudioNodeInput.h"
+#include "AudioNodeOutput.h"
+#include "AudioProcessor.h"
+
+namespace WebCore {
+
+AudioBasicProcessorNode::AudioBasicProcessorNode(AudioContext* context, double sampleRate)
+    : AudioNode(context, sampleRate)
+{
+    addInput(adoptPtr(new AudioNodeInput(this)));
+    addOutput(adoptPtr(new AudioNodeOutput(this, 0)));
+
+    // The subclass must create m_processor.
+}
+
+void AudioBasicProcessorNode::initialize()
+{
+    if (isInitialized())
+        return;
+
+    ASSERT(processor());
+    processor()->initialize();
+
+    AudioNode::initialize();
+}
+
+void AudioBasicProcessorNode::uninitialize()
+{
+    if (!isInitialized())
+        return;
+
+    ASSERT(processor());
+    processor()->uninitialize();
+
+    AudioNode::uninitialize();
+}
+
+void AudioBasicProcessorNode::process(size_t framesToProcess)
+{
+    AudioBus* destinationBus = output(0)->bus();
+    
+    // The realtime thread can't block on this lock, so we call tryLock() instead.
+    if (m_processLock.tryLock()) {
+        if (!isInitialized() || !processor())
+            destinationBus->zero();
+        else {
+            AudioBus* sourceBus = input(0)->bus();
+
+            // FIXME: if we take "tail time" into account, then we can avoid calling processor()->process() once the tail dies down.
+            if (!input(0)->isConnected())
+                sourceBus->zero();
+            
+            processor()->process(sourceBus, destinationBus, framesToProcess);  
+        }
+
+        m_processLock.unlock();
+    } else {
+        // Too bad - the tryLock() failed.  We must be in the middle of re-connecting and were already outputting silence anyway...
+        destinationBus->zero();
+    }
+}
+
+// Nice optimization in the very common case allowing for "in-place" processing
+void AudioBasicProcessorNode::pullInputs(size_t framesToProcess)
+{
+    // Render input stream - suggest to the input to render directly into output bus for in-place processing in process() if possible.
+    input(0)->pull(output(0)->bus(), framesToProcess);
+}
+
+void AudioBasicProcessorNode::reset()
+{
+    if (processor())
+        processor()->reset();
+}
+
+// As soon as we know the channel count of our input, we can lazily initialize.
+// Sometimes this may be called more than once with different channel counts, in which case we must safely
+// uninitialize and then re-initialize with the new channel count.
+void AudioBasicProcessorNode::checkNumberOfChannelsForInput(AudioNodeInput* input)
+{
+    ASSERT(isMainThread());
+    
+    ASSERT(input == this->input(0));
+    if (input != this->input(0))
+        return;
+
+    ASSERT(processor());
+    if (!processor())
+        return;
+
+    unsigned numberOfChannels = input->numberOfChannels();
+    
+    if (isInitialized() && numberOfChannels != output(0)->numberOfChannels()) {
+        // We're already initialized but the channel count has changed.
+        // We need to be careful since we may be actively processing right now, so synchronize with process().
+        MutexLocker locker(m_processLock);
+        uninitialize();
+    }
+    
+    // This will propagate the channel count to any nodes connected further down the chain...
+    output(0)->setNumberOfChannels(numberOfChannels);
+
+    // Re-initialize the processor with the new channel count.
+    processor()->setNumberOfChannels(numberOfChannels);
+    initialize();
+}
+
+unsigned AudioBasicProcessorNode::numberOfChannels()
+{
+    return output(0)->numberOfChannels();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)