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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /dom/media/webaudio/blink/FFTConvolver.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/media/webaudio/blink/FFTConvolver.cpp')
-rw-r--r--dom/media/webaudio/blink/FFTConvolver.cpp118
1 files changed, 118 insertions, 0 deletions
diff --git a/dom/media/webaudio/blink/FFTConvolver.cpp b/dom/media/webaudio/blink/FFTConvolver.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.
+ * 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 "FFTConvolver.h"
+#include "mozilla/PodOperations.h"
+
+using namespace mozilla;
+
+namespace WebCore {
+
+FFTConvolver::FFTConvolver(size_t fftSize, size_t renderPhase)
+ : m_frame(fftSize), m_readWriteIndex(renderPhase % (fftSize / 2)) {
+ MOZ_ASSERT(fftSize >= 2 * WEBAUDIO_BLOCK_SIZE);
+ m_inputBuffer.SetLength(fftSize);
+ PodZero(m_inputBuffer.Elements(), fftSize);
+ m_outputBuffer.SetLength(fftSize);
+ PodZero(m_outputBuffer.Elements(), fftSize);
+ m_lastOverlapBuffer.SetLength(fftSize / 2);
+ PodZero(m_lastOverlapBuffer.Elements(), fftSize / 2);
+}
+
+size_t FFTConvolver::sizeOfExcludingThis(
+ mozilla::MallocSizeOf aMallocSizeOf) const {
+ size_t amount = 0;
+ amount += m_frame.SizeOfExcludingThis(aMallocSizeOf);
+ amount += m_inputBuffer.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ amount += m_outputBuffer.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ amount += m_lastOverlapBuffer.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ return amount;
+}
+
+size_t FFTConvolver::sizeOfIncludingThis(
+ mozilla::MallocSizeOf aMallocSizeOf) const {
+ return aMallocSizeOf(this) + sizeOfExcludingThis(aMallocSizeOf);
+}
+
+const float* FFTConvolver::process(FFTBlock* fftKernel, const float* sourceP) {
+ size_t halfSize = fftSize() / 2;
+
+ // WEBAUDIO_BLOCK_SIZE must be an exact multiple of halfSize,
+ // halfSize must be a multiple of WEBAUDIO_BLOCK_SIZE
+ // and > WEBAUDIO_BLOCK_SIZE.
+ MOZ_ASSERT(halfSize % WEBAUDIO_BLOCK_SIZE == 0 &&
+ WEBAUDIO_BLOCK_SIZE <= halfSize);
+
+ // Copy samples to input buffer (note contraint above!)
+ float* inputP = m_inputBuffer.Elements();
+
+ MOZ_ASSERT(sourceP && inputP &&
+ m_readWriteIndex + WEBAUDIO_BLOCK_SIZE <= m_inputBuffer.Length());
+
+ memcpy(inputP + m_readWriteIndex, sourceP,
+ sizeof(float) * WEBAUDIO_BLOCK_SIZE);
+
+ float* outputP = m_outputBuffer.Elements();
+ m_readWriteIndex += WEBAUDIO_BLOCK_SIZE;
+
+ // Check if it's time to perform the next FFT
+ if (m_readWriteIndex == halfSize) {
+ // The input buffer is now filled (get frequency-domain version)
+ m_frame.PerformFFT(m_inputBuffer.Elements());
+ m_frame.Multiply(*fftKernel);
+ m_frame.GetInverseWithoutScaling(m_outputBuffer.Elements());
+
+ // Overlap-add 1st half from previous time
+ AudioBufferAddWithScale(m_lastOverlapBuffer.Elements(), 1.0f,
+ m_outputBuffer.Elements(), halfSize);
+
+ // Finally, save 2nd half of result
+ MOZ_ASSERT(m_outputBuffer.Length() == 2 * halfSize &&
+ m_lastOverlapBuffer.Length() == halfSize);
+
+ memcpy(m_lastOverlapBuffer.Elements(), m_outputBuffer.Elements() + halfSize,
+ sizeof(float) * halfSize);
+
+ // Reset index back to start for next time
+ m_readWriteIndex = 0;
+ }
+
+ return outputP + m_readWriteIndex;
+}
+
+void FFTConvolver::reset() {
+ PodZero(m_lastOverlapBuffer.Elements(), m_lastOverlapBuffer.Length());
+ m_readWriteIndex = 0;
+}
+
+size_t FFTConvolver::latencyFrames() const {
+ return std::max<size_t>(fftSize() / 2, WEBAUDIO_BLOCK_SIZE) -
+ WEBAUDIO_BLOCK_SIZE;
+}
+
+} // namespace WebCore