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2010-10-18 Chris Rogers <crogers@google.com>
Reviewed by Chris Fleizach.
Add AudioResampler files
https://bugs.webkit.org/show_bug.cgi?id=47623
No new tests since audio API is not yet implemented.
* platform/audio/AudioResampler.cpp: Added.
(WebCore::AudioResampler::AudioResampler):
(WebCore::AudioResampler::configureChannels):
(WebCore::AudioResampler::process):
(WebCore::AudioResampler::setRate):
(WebCore::AudioResampler::reset):
* platform/audio/AudioResampler.h: Added.
(WebCore::AudioResampler::~AudioResampler):
(WebCore::AudioResampler::rate):
Canonical link: https://commits.webkit.org/60580@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@70015 268f45cc-cd09-0410-ab3c-d52691b4dbfc- Loading branch information
Chris Rogers
committed
Oct 19, 2010
1 parent
0563b77
commit b4f204ee179c008c3840d22a14158a19b7965eb3
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| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| #include "config.h" | ||
|
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| #if ENABLE(WEB_AUDIO) | ||
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| #include "AudioResampler.h" | ||
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| #include "AudioBus.h" | ||
| #include <algorithm> | ||
| #include <math.h> | ||
|
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| using namespace std; | ||
|
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| namespace WebCore { | ||
|
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| const double AudioResampler::MaxRate = 8.0; | ||
|
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| AudioResampler::AudioResampler() | ||
| : m_rate(1.0) | ||
| { | ||
| m_kernels.append(adoptPtr(new AudioResamplerKernel(this))); | ||
| m_sourceBus = adoptPtr(new AudioBus(1, 0, false)); | ||
| } | ||
|
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| AudioResampler::AudioResampler(unsigned numberOfChannels) | ||
| : m_rate(1.0) | ||
| { | ||
| for (unsigned i = 0; i < numberOfChannels; ++i) | ||
| m_kernels.append(adoptPtr(new AudioResamplerKernel(this))); | ||
|
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| m_sourceBus = adoptPtr(new AudioBus(numberOfChannels, 0, false)); | ||
| } | ||
|
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| void AudioResampler::configureChannels(unsigned numberOfChannels) | ||
| { | ||
| unsigned currentSize = m_kernels.size(); | ||
| if (numberOfChannels == currentSize) | ||
| return; // already setup | ||
|
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| // 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); | ||
|
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| // Reconfigure our source bus to the new channel size. | ||
| m_sourceBus = adoptPtr(new AudioBus(numberOfChannels, 0, false)); | ||
| } | ||
|
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| void AudioResampler::process(AudioSourceProvider* provider, AudioBus* destinationBus, size_t framesToProcess) | ||
| { | ||
| ASSERT(provider); | ||
| if (!provider) | ||
| return; | ||
|
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| unsigned numberOfChannels = m_kernels.size(); | ||
|
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| // Make sure our configuration matches the bus we're rendering to. | ||
| bool channelsMatch = (destinationBus && destinationBus->numberOfChannels() == numberOfChannels); | ||
| ASSERT(channelsMatch); | ||
| if (!channelsMatch) | ||
| return; | ||
|
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| // 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; | ||
|
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| m_sourceBus->setChannelMemory(i, fillPointer, framesNeeded); | ||
| } | ||
|
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| // Ask the provider to supply the desired number of source frames. | ||
| provider->provideInput(m_sourceBus.get(), m_sourceBus->length()); | ||
|
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| // 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); | ||
| } | ||
| } | ||
|
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| void AudioResampler::setRate(double rate) | ||
| { | ||
| if (isnan(rate) || isinf(rate) || rate <= 0.0) | ||
| return; | ||
|
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| m_rate = min(AudioResampler::MaxRate, rate); | ||
| } | ||
|
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| void AudioResampler::reset() | ||
| { | ||
| unsigned numberOfChannels = m_kernels.size(); | ||
| for (unsigned i = 0; i < numberOfChannels; ++i) | ||
| m_kernels[i]->reset(); | ||
| } | ||
|
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| } // namespace WebCore | ||
|
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| #endif // ENABLE(WEB_AUDIO) |
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| @@ -0,0 +1,68 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| #ifndef AudioResampler_h | ||
| #define AudioResampler_h | ||
|
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| #include "AudioBus.h" | ||
| #include "AudioResamplerKernel.h" | ||
| #include "AudioSourceProvider.h" | ||
| #include <wtf/OwnPtr.h> | ||
| #include <wtf/Vector.h> | ||
|
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| namespace WebCore { | ||
|
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| // AudioResampler resamples the audio stream from an AudioSourceProvider. | ||
| // The audio stream may be single or multi-channel. | ||
| // The default constructor defaults to single-channel (mono). | ||
|
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| class AudioResampler { | ||
| public: | ||
| AudioResampler(); | ||
| AudioResampler(unsigned numberOfChannels); | ||
| ~AudioResampler() { } | ||
|
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| // Given an AudioSourceProvider, process() resamples the source stream into destinationBus. | ||
| void process(AudioSourceProvider*, AudioBus* destinationBus, size_t framesToProcess); | ||
|
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| // Resets the processing state. | ||
| void reset(); | ||
|
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| void configureChannels(unsigned numberOfChannels); | ||
|
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| // 0 < rate <= MaxRate | ||
| void setRate(double rate); | ||
| double rate() const { return m_rate; } | ||
|
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| static const double MaxRate; | ||
|
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| private: | ||
| double m_rate; | ||
| Vector<OwnPtr<AudioResamplerKernel> > m_kernels; | ||
| OwnPtr<AudioBus> m_sourceBus; | ||
| }; | ||
|
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| } // namespace WebCore | ||
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| #endif // AudioResampler_h |