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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/platform/audio/AudioDSPKernelProcessor.cpp | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/platform/audio/AudioDSPKernelProcessor.cpp')
-rw-r--r-- | Source/WebCore/platform/audio/AudioDSPKernelProcessor.cpp | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/Source/WebCore/platform/audio/AudioDSPKernelProcessor.cpp b/Source/WebCore/platform/audio/AudioDSPKernelProcessor.cpp new file mode 100644 index 0000000..d79afd5 --- /dev/null +++ b/Source/WebCore/platform/audio/AudioDSPKernelProcessor.cpp @@ -0,0 +1,116 @@ +/* + * 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: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * 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. + * * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT + * OWNER OR 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 "config.h" + +#if ENABLE(WEB_AUDIO) + +#include "AudioDSPKernelProcessor.h" + +#include "AudioDSPKernel.h" + +namespace WebCore { + +// setNumberOfChannels() may later be called if the object is not yet in an "initialized" state. +AudioDSPKernelProcessor::AudioDSPKernelProcessor(double sampleRate, unsigned numberOfChannels) + : AudioProcessor(sampleRate) + , m_numberOfChannels(numberOfChannels) + , m_hasJustReset(true) +{ +} + +void AudioDSPKernelProcessor::initialize() +{ + if (isInitialized()) + return; + + ASSERT(!m_kernels.size()); + + // Create processing kernels, one per channel. + for (unsigned i = 0; i < numberOfChannels(); ++i) + m_kernels.append(createKernel()); + + m_initialized = true; +} + +void AudioDSPKernelProcessor::uninitialize() +{ + if (!isInitialized()) + return; + + m_kernels.clear(); + + m_initialized = false; +} + +void AudioDSPKernelProcessor::process(AudioBus* source, AudioBus* destination, size_t framesToProcess) +{ + ASSERT(source && destination); + if (!source || !destination) + return; + + if (!isInitialized()) { + destination->zero(); + return; + } + + bool channelCountMatches = source->numberOfChannels() == destination->numberOfChannels() && source->numberOfChannels() == m_kernels.size(); + ASSERT(channelCountMatches); + if (!channelCountMatches) + return; + + for (unsigned i = 0; i < m_kernels.size(); ++i) + m_kernels[i]->process(source->channel(i)->data(), destination->channel(i)->data(), framesToProcess); +} + +// Resets filter state +void AudioDSPKernelProcessor::reset() +{ + if (!isInitialized()) + return; + + // Forces snap to parameter values - first time. + // Any processing depending on this value must set it to false at the appropriate time. + m_hasJustReset = true; + + for (unsigned i = 0; i < m_kernels.size(); ++i) + m_kernels[i]->reset(); +} + +void AudioDSPKernelProcessor::setNumberOfChannels(unsigned numberOfChannels) +{ + ASSERT(!isInitialized()); + if (!isInitialized()) + m_numberOfChannels = numberOfChannels; +} + +} // namespace WebCore + +#endif // ENABLE(WEB_AUDIO) |