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      1 /*
      2  * Copyright (C) 2011, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "modules/webaudio/WaveShaperProcessor.h"
     30 
     31 #include "modules/webaudio/WaveShaperDSPKernel.h"
     32 
     33 namespace blink {
     34 
     35 WaveShaperProcessor::WaveShaperProcessor(float sampleRate, size_t numberOfChannels)
     36     : AudioDSPKernelProcessor(sampleRate, numberOfChannels)
     37     , m_oversample(OverSampleNone)
     38 {
     39 }
     40 
     41 WaveShaperProcessor::~WaveShaperProcessor()
     42 {
     43     if (isInitialized())
     44         uninitialize();
     45 }
     46 
     47 PassOwnPtr<AudioDSPKernel> WaveShaperProcessor::createKernel()
     48 {
     49     return adoptPtr(new WaveShaperDSPKernel(this));
     50 }
     51 
     52 void WaveShaperProcessor::setCurve(Float32Array* curve)
     53 {
     54     // This synchronizes with process().
     55     MutexLocker processLocker(m_processLock);
     56 
     57     m_curve = curve;
     58 }
     59 
     60 void WaveShaperProcessor::setOversample(OverSampleType oversample)
     61 {
     62     // This synchronizes with process().
     63     MutexLocker processLocker(m_processLock);
     64 
     65     m_oversample = oversample;
     66 
     67     if (oversample != OverSampleNone) {
     68         for (unsigned i = 0; i < m_kernels.size(); ++i) {
     69             WaveShaperDSPKernel* kernel = static_cast<WaveShaperDSPKernel*>(m_kernels[i].get());
     70             kernel->lazyInitializeOversampling();
     71         }
     72     }
     73 }
     74 
     75 void WaveShaperProcessor::process(const AudioBus* source, AudioBus* destination, size_t framesToProcess)
     76 {
     77     if (!isInitialized()) {
     78         destination->zero();
     79         return;
     80     }
     81 
     82     bool channelCountMatches = source->numberOfChannels() == destination->numberOfChannels() && source->numberOfChannels() == m_kernels.size();
     83     ASSERT(channelCountMatches);
     84     if (!channelCountMatches)
     85         return;
     86 
     87     // The audio thread can't block on this lock, so we call tryLock() instead.
     88     MutexTryLocker tryLocker(m_processLock);
     89     if (tryLocker.locked()) {
     90         // For each channel of our input, process using the corresponding WaveShaperDSPKernel into the output channel.
     91         for (unsigned i = 0; i < m_kernels.size(); ++i)
     92             m_kernels[i]->process(source->channel(i)->data(), destination->channel(i)->mutableData(), framesToProcess);
     93     } else {
     94         // Too bad - the tryLock() failed. We must be in the middle of a setCurve() call.
     95         destination->zero();
     96     }
     97 }
     98 
     99 } // namespace blink
    100 
    101 #endif // ENABLE(WEB_AUDIO)
    102