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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.
+ */
+
+#ifndef ReverbConvolverStage_h
+#define ReverbConvolverStage_h
+
+#include "FFTConvolver.h"
+
+#include "nsTArray.h"
+#include "mozilla/FFTBlock.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/UniquePtr.h"
+
+namespace WebCore {
+
+using mozilla::FFTBlock;
+
+class ReverbAccumulationBuffer;
+class ReverbConvolver;
+
+// A ReverbConvolverStage represents the convolution associated with a
+// sub-section of a large impulse response. It incorporates a delay line to
+// account for the offset of the sub-section within the larger impulse response.
+class ReverbConvolverStage {
+ public:
+  // renderPhase is useful to know so that we can manipulate the pre versus post
+  // delay so that stages will perform their heavy work (FFT processing) on
+  // different slices to balance the load in a real-time thread.
+  ReverbConvolverStage(const float* impulseResponse, size_t responseLength,
+                       size_t reverbTotalLatency, size_t stageOffset,
+                       size_t stageLength, size_t fftSize, size_t renderPhase,
+                       ReverbAccumulationBuffer*);
+
+  // |source| must point to an array of WEBAUDIO_BLOCK_SIZE elements.
+  void process(const float* source);
+
+  void processInBackground(ReverbConvolver* convolver);
+
+  // Useful for background processing
+  int inputReadIndex() const { return m_inputReadIndex; }
+
+  size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ private:
+  mozilla::UniquePtr<FFTBlock> m_fftKernel;
+  mozilla::UniquePtr<FFTConvolver> m_fftConvolver;
+
+  ReverbAccumulationBuffer* m_accumulationBuffer;
+  size_t m_accumulationReadIndex;
+  int m_inputReadIndex;
+
+  size_t m_postDelayLength;
+
+  nsTArray<float> m_temporaryBuffer;
+};
+
+}  // namespace WebCore
+
+#endif  // ReverbConvolverStage_h