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-rw-r--r--WebCore/platform/audio/AudioResampler.cpp128
1 files changed, 0 insertions, 128 deletions
diff --git a/WebCore/platform/audio/AudioResampler.cpp b/WebCore/platform/audio/AudioResampler.cpp
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--- a/WebCore/platform/audio/AudioResampler.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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 "config.h"
-
-#if ENABLE(WEB_AUDIO)
-
-#include "AudioResampler.h"
-
-#include "AudioBus.h"
-#include <algorithm>
-#include <wtf/MathExtras.h>
-
-using namespace std;
-
-namespace WebCore {
-
-const double AudioResampler::MaxRate = 8.0;
-
-AudioResampler::AudioResampler()
- : m_rate(1.0)
-{
- m_kernels.append(adoptPtr(new AudioResamplerKernel(this)));
- m_sourceBus = adoptPtr(new AudioBus(1, 0, false));
-}
-
-AudioResampler::AudioResampler(unsigned numberOfChannels)
- : m_rate(1.0)
-{
- for (unsigned i = 0; i < numberOfChannels; ++i)
- m_kernels.append(adoptPtr(new AudioResamplerKernel(this)));
-
- m_sourceBus = adoptPtr(new AudioBus(numberOfChannels, 0, false));
-}
-
-void AudioResampler::configureChannels(unsigned numberOfChannels)
-{
- unsigned currentSize = m_kernels.size();
- if (numberOfChannels == currentSize)
- return; // already setup
-
- // First deal with adding or removing kernels.
- if (numberOfChannels > currentSize) {
- for (unsigned i = currentSize; i < numberOfChannels; ++i)
- m_kernels.append(adoptPtr(new AudioResamplerKernel(this)));
- } else
- m_kernels.resize(numberOfChannels);
-
- // Reconfigure our source bus to the new channel size.
- m_sourceBus = adoptPtr(new AudioBus(numberOfChannels, 0, false));
-}
-
-void AudioResampler::process(AudioSourceProvider* provider, AudioBus* destinationBus, size_t framesToProcess)
-{
- ASSERT(provider);
- if (!provider)
- return;
-
- unsigned numberOfChannels = m_kernels.size();
-
- // Make sure our configuration matches the bus we're rendering to.
- bool channelsMatch = (destinationBus && destinationBus->numberOfChannels() == numberOfChannels);
- ASSERT(channelsMatch);
- if (!channelsMatch)
- return;
-
- // Setup the source bus.
- for (unsigned i = 0; i < numberOfChannels; ++i) {
- // Figure out how many frames we need to get from the provider, and a pointer to the buffer.
- size_t framesNeeded;
- float* fillPointer = m_kernels[i]->getSourcePointer(framesToProcess, &framesNeeded);
- ASSERT(fillPointer);
- if (!fillPointer)
- return;
-
- m_sourceBus->setChannelMemory(i, fillPointer, framesNeeded);
- }
-
- // Ask the provider to supply the desired number of source frames.
- provider->provideInput(m_sourceBus.get(), m_sourceBus->length());
-
- // Now that we have the source data, resample each channel into the destination bus.
- // FIXME: optimize for the common stereo case where it's faster to process both left/right channels in the same inner loop.
- for (unsigned i = 0; i < numberOfChannels; ++i) {
- float* destination = destinationBus->channel(i)->data();
- m_kernels[i]->process(destination, framesToProcess);
- }
-}
-
-void AudioResampler::setRate(double rate)
-{
- if (isnan(rate) || isinf(rate) || rate <= 0.0)
- return;
-
- m_rate = min(AudioResampler::MaxRate, rate);
-}
-
-void AudioResampler::reset()
-{
- unsigned numberOfChannels = m_kernels.size();
- for (unsigned i = 0; i < numberOfChannels; ++i)
- m_kernels[i]->reset();
-}
-
-} // namespace WebCore
-
-#endif // ENABLE(WEB_AUDIO)