2 * Copyright (C) 2010 Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #ifndef ReverbConvolverStage_h
30 #define ReverbConvolverStage_h
32 #include "platform/audio/AudioArray.h"
33 #include "platform/audio/FFTFrame.h"
34 #include "wtf/Noncopyable.h"
35 #include "wtf/OwnPtr.h"
39 class ReverbAccumulationBuffer;
40 class ReverbConvolver;
42 class DirectConvolver;
44 // A ReverbConvolverStage represents the convolution associated with a sub-section of a large impulse response.
45 // It incorporates a delay line to account for the offset of the sub-section within the larger impulse response.
46 class PLATFORM_EXPORT ReverbConvolverStage {
47 WTF_MAKE_NONCOPYABLE(ReverbConvolverStage);
49 // renderPhase is useful to know so that we can manipulate the pre versus post delay so that stages will perform
50 // their heavy work (FFT processing) on different slices to balance the load in a real-time thread.
51 ReverbConvolverStage(const float* impulseResponse, size_t responseLength, size_t reverbTotalLatency, size_t stageOffset, size_t stageLength, size_t fftSize, size_t renderPhase, size_t renderSliceSize, ReverbAccumulationBuffer*, bool directMode = false);
53 // WARNING: framesToProcess must be such that it evenly divides the delay buffer size (stage_offset).
54 void process(const float* source, size_t framesToProcess);
56 void processInBackground(ReverbConvolver* convolver, size_t framesToProcess);
60 // Useful for background processing
61 int inputReadIndex() const { return m_inputReadIndex; }
64 OwnPtr<FFTFrame> m_fftKernel;
65 OwnPtr<FFTConvolver> m_fftConvolver;
67 AudioFloatArray m_preDelayBuffer;
69 ReverbAccumulationBuffer* m_accumulationBuffer;
70 int m_accumulationReadIndex;
73 size_t m_preDelayLength;
74 size_t m_postDelayLength;
75 size_t m_preReadWriteIndex;
76 size_t m_framesProcessed;
78 AudioFloatArray m_temporaryBuffer;
81 OwnPtr<AudioFloatArray> m_directKernel;
82 OwnPtr<DirectConvolver> m_directConvolver;
87 #endif // ReverbConvolverStage_h