Revert "This CL is to reduce the complexity of current FIFO structure."

third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp

Index: third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp
diff --git a/third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp b/third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ca14cfac259e0a9d929445045eeb18fc2642bc79
--- /dev/null
+++ b/third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2012 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 "platform/audio/AudioPullFIFO.h"
+
+namespace blink {
+
+AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider,
+                             unsigned numberOfChannels,
+                             size_t fifoLength,
+                             size_t providerSize)
+    : m_provider(audioProvider),
+      m_fifo(numberOfChannels, fifoLength),
+      m_providerSize(providerSize),
+      m_tempBus(AudioBus::create(numberOfChannels, providerSize)) {}
+
+void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume) {
+  if (!destination)
+    return;
+
+  if (framesToConsume > m_fifo.framesInFifo()) {
+    // We don't have enough data in the FIFO to fulfill the request. Ask for
+    // more data.
+    fillBuffer(framesToConsume - m_fifo.framesInFifo());
+  }
+
+  m_fifo.consume(destination, framesToConsume);
+}
+
+void AudioPullFIFO::fillBuffer(size_t numberOfFrames) {
+  // Keep asking the provider to give us data until we have received at least
+  // |numberOfFrames| of data. Stuff the data into the FIFO.
+  size_t framesProvided = 0;
+
+  while (framesProvided < numberOfFrames) {
+    m_provider.provideInput(m_tempBus.get(), m_providerSize);
+
+    m_fifo.push(m_tempBus.get());
+
+    framesProvided += m_providerSize;
+  }
+}
+
+}  // namespace blink