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Move library tree where it belongs
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195
lib-src/libvamp/examples/ZeroCrossing.cpp
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195
lib-src/libvamp/examples/ZeroCrossing.cpp
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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Vamp
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An API for audio analysis and feature extraction plugins.
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Centre for Digital Music, Queen Mary, University of London.
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Copyright 2006 Chris Cannam.
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
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ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the names of the Centre for
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Digital Music; Queen Mary, University of London; and Chris Cannam
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shall not be used in advertising or otherwise to promote the sale,
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use or other dealings in this Software without prior written
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authorization.
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*/
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#include "ZeroCrossing.h"
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using std::string;
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using std::vector;
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using std::cerr;
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using std::endl;
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#include <cmath>
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ZeroCrossing::ZeroCrossing(float inputSampleRate) :
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Plugin(inputSampleRate),
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m_stepSize(0),
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m_previousSample(0.0f)
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{
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}
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ZeroCrossing::~ZeroCrossing()
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{
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}
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string
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ZeroCrossing::getIdentifier() const
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{
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return "zerocrossing";
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}
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string
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ZeroCrossing::getName() const
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{
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return "Zero Crossings";
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}
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string
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ZeroCrossing::getDescription() const
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{
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return "Detect and count zero crossing points";
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}
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string
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ZeroCrossing::getMaker() const
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{
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return "Vamp SDK Example Plugins";
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}
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int
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ZeroCrossing::getPluginVersion() const
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{
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return 2;
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}
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string
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ZeroCrossing::getCopyright() const
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{
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return "Freely redistributable (BSD license)";
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}
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bool
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ZeroCrossing::initialise(size_t channels, size_t stepSize, size_t blockSize)
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{
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if (channels < getMinChannelCount() ||
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channels > getMaxChannelCount()) return false;
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m_stepSize = std::min(stepSize, blockSize);
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return true;
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}
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void
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ZeroCrossing::reset()
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{
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m_previousSample = 0.0f;
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}
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ZeroCrossing::OutputList
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ZeroCrossing::getOutputDescriptors() const
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{
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OutputList list;
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OutputDescriptor zc;
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zc.identifier = "counts";
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zc.name = "Zero Crossing Counts";
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zc.description = "The number of zero crossing points per processing block";
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zc.unit = "crossings";
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zc.hasFixedBinCount = true;
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zc.binCount = 1;
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zc.hasKnownExtents = false;
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zc.isQuantized = true;
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zc.quantizeStep = 1.0;
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zc.sampleType = OutputDescriptor::OneSamplePerStep;
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list.push_back(zc);
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zc.identifier = "zerocrossings";
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zc.name = "Zero Crossings";
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zc.description = "The locations of zero crossing points";
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zc.unit = "";
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zc.hasFixedBinCount = true;
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zc.binCount = 0;
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zc.sampleType = OutputDescriptor::VariableSampleRate;
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zc.sampleRate = m_inputSampleRate;
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list.push_back(zc);
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return list;
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}
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ZeroCrossing::FeatureSet
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ZeroCrossing::process(const float *const *inputBuffers,
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Vamp::RealTime timestamp)
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{
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if (m_stepSize == 0) {
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cerr << "ERROR: ZeroCrossing::process: "
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<< "ZeroCrossing has not been initialised"
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<< endl;
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return FeatureSet();
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}
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float prev = m_previousSample;
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size_t count = 0;
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FeatureSet returnFeatures;
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for (size_t i = 0; i < m_stepSize; ++i) {
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float sample = inputBuffers[0][i];
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bool crossing = false;
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if (sample <= 0.0) {
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if (prev > 0.0) crossing = true;
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} else if (sample > 0.0) {
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if (prev <= 0.0) crossing = true;
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}
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if (crossing) {
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++count;
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Feature feature;
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feature.hasTimestamp = true;
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feature.timestamp = timestamp +
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Vamp::RealTime::frame2RealTime(i, (size_t)m_inputSampleRate);
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returnFeatures[1].push_back(feature);
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}
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prev = sample;
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}
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m_previousSample = prev;
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Feature feature;
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feature.hasTimestamp = false;
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feature.values.push_back(count);
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returnFeatures[0].push_back(feature);
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return returnFeatures;
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}
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ZeroCrossing::FeatureSet
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ZeroCrossing::getRemainingFeatures()
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{
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return FeatureSet();
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}
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