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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/media/webaudio/blink/ZeroPole.cpp | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/media/webaudio/blink/ZeroPole.cpp')
-rw-r--r-- | dom/media/webaudio/blink/ZeroPole.cpp | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/dom/media/webaudio/blink/ZeroPole.cpp b/dom/media/webaudio/blink/ZeroPole.cpp new file mode 100644 index 0000000000..4d0888d758 --- /dev/null +++ b/dom/media/webaudio/blink/ZeroPole.cpp @@ -0,0 +1,83 @@ +/* + * Copyright (C) 2011 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 "ZeroPole.h" + +#include "DenormalDisabler.h" + +#include <cmath> +#include <float.h> + +namespace WebCore { + +void ZeroPole::process(const float* source, float* destination, + int framesToProcess) { + float zero = m_zero; + float pole = m_pole; + + // Gain compensation to make 0dB @ 0Hz + const float k1 = 1 / (1 - zero); + const float k2 = 1 - pole; + + // Member variables to locals. + float lastX = m_lastX; + float lastY = m_lastY; + + for (int i = 0; i < framesToProcess; ++i) { + float input = source[i]; + + // Zero + float output1 = k1 * (input - zero * lastX); + lastX = input; + + // Pole + float output2 = k2 * output1 + pole * lastY; + lastY = output2; + + destination[i] = output2; + } + +// Locals to member variables. Flush denormals here so we don't +// slow down the inner loop above. +#ifndef HAVE_DENORMAL + if (lastX == 0.0f && lastY != 0.0f && fabsf(lastY) < FLT_MIN) { + // Flush future values to zero (until there is new input). + lastY = 0.0; + + // Flush calculated values. + for (int i = framesToProcess; i-- && fabsf(destination[i]) < FLT_MIN;) { + destination[i] = 0.0f; + } + } +#endif + + m_lastX = lastX; + m_lastY = lastY; +} + +} // namespace WebCore |