From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- dom/media/webaudio/blink/FFTConvolver.h | 85 +++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 dom/media/webaudio/blink/FFTConvolver.h (limited to 'dom/media/webaudio/blink/FFTConvolver.h') diff --git a/dom/media/webaudio/blink/FFTConvolver.h b/dom/media/webaudio/blink/FFTConvolver.h new file mode 100644 index 000000000..118c6baef --- /dev/null +++ b/dom/media/webaudio/blink/FFTConvolver.h @@ -0,0 +1,85 @@ +/* + * 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 FFTConvolver_h +#define FFTConvolver_h + +#include "nsTArray.h" +#include "mozilla/FFTBlock.h" +#include "mozilla/MemoryReporting.h" + +namespace WebCore { + +typedef AlignedTArray AlignedAudioFloatArray; +using mozilla::FFTBlock; + +class FFTConvolver { +public: + // |fftSize| must be a power of two. + // + // |renderPhase| is the initial offset in the initially zero input buffer. + // It is coordinated with the other stages, so they don't all do their + // FFTs at the same time. + explicit FFTConvolver(size_t fftSize, size_t renderPhase = 0); + + // Process WEBAUDIO_BLOCK_SIZE elements of array |sourceP| and return a + // pointer to an output array of the same size. + // + // |fftKernel| must be pre-scaled for FFTBlock::GetInverseWithoutScaling(). + // + // FIXME: Later, we can do more sophisticated buffering to relax this requirement... + const float* process(FFTBlock* fftKernel, const float* sourceP); + + void reset(); + + size_t fftSize() const { return m_frame.FFTSize(); } + + // The input to output latency is up to fftSize / 2, but alignment of the + // FFTs with the blocks reduces this by one block. + size_t latencyFrames() const; + + size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + +private: + FFTBlock m_frame; + + // Buffer input until we get fftSize / 2 samples then do an FFT + size_t m_readWriteIndex; + AlignedAudioFloatArray m_inputBuffer; + + // Stores output which we read a little at a time + AlignedAudioFloatArray m_outputBuffer; + + // Saves the 2nd half of the FFT buffer, so we can do an overlap-add with the 1st half of the next one + AlignedAudioFloatArray m_lastOverlapBuffer; +}; + +} // namespace WebCore + +#endif // FFTConvolver_h -- cgit v1.2.3