cannam@0: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
cannam@0: 
cannam@0: /*
cannam@0:     Vamp
cannam@0: 
cannam@0:     An API for audio analysis and feature extraction plugins.
cannam@0: 
cannam@0:     Centre for Digital Music, Queen Mary, University of London.
cannam@0:     Copyright 2006 Chris Cannam.
cannam@0:   
cannam@0:     Permission is hereby granted, free of charge, to any person
cannam@0:     obtaining a copy of this software and associated documentation
cannam@0:     files (the "Software"), to deal in the Software without
cannam@0:     restriction, including without limitation the rights to use, copy,
cannam@0:     modify, merge, publish, distribute, sublicense, and/or sell copies
cannam@0:     of the Software, and to permit persons to whom the Software is
cannam@0:     furnished to do so, subject to the following conditions:
cannam@0: 
cannam@0:     The above copyright notice and this permission notice shall be
cannam@0:     included in all copies or substantial portions of the Software.
cannam@0: 
cannam@0:     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@0:     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@0:     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
cannam@6:     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
cannam@0:     ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@0:     CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@0:     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@0: 
cannam@0:     Except as contained in this notice, the names of the Centre for
cannam@0:     Digital Music; Queen Mary, University of London; and Chris Cannam
cannam@0:     shall not be used in advertising or otherwise to promote the sale,
cannam@0:     use or other dealings in this Software without prior written
cannam@0:     authorization.
cannam@0: */
cannam@0: 
cannam@0: #include "SpectralCentroid.h"
cannam@0: 
cannam@0: using std::string;
cannam@0: using std::vector;
cannam@0: using std::cerr;
cannam@0: using std::endl;
cannam@0: 
cannam@7: #include <cmath>
cannam@7: 
cannam@0: 
cannam@0: SpectralCentroid::SpectralCentroid(float inputSampleRate) :
cannam@0:     Plugin(inputSampleRate),
cannam@0:     m_stepSize(0),
cannam@21:     m_blockSize(0)
cannam@0: {
cannam@0: }
cannam@0: 
cannam@0: SpectralCentroid::~SpectralCentroid()
cannam@0: {
cannam@0: }
cannam@0: 
cannam@0: string
cannam@0: SpectralCentroid::getName() const
cannam@0: {
cannam@0:     return "spectralcentroid";
cannam@0: }
cannam@0: 
cannam@0: string
cannam@0: SpectralCentroid::getDescription() const
cannam@0: {
cannam@0:     return "Spectral Centroid";
cannam@0: }
cannam@0: 
cannam@0: string
cannam@0: SpectralCentroid::getMaker() const
cannam@0: {
cannam@43:     return "Vamp SDK Example Plugins";
cannam@0: }
cannam@0: 
cannam@0: int
cannam@0: SpectralCentroid::getPluginVersion() const
cannam@0: {
cannam@0:     return 2;
cannam@0: }
cannam@0: 
cannam@0: string
cannam@0: SpectralCentroid::getCopyright() const
cannam@0: {
cannam@7:     return "Freely redistributable (BSD license)";
cannam@0: }
cannam@0: 
cannam@0: bool
cannam@0: SpectralCentroid::initialise(size_t channels, size_t stepSize, size_t blockSize)
cannam@0: {
cannam@0:     if (channels < getMinChannelCount() ||
cannam@0: 	channels > getMaxChannelCount()) return false;
cannam@0: 
cannam@0:     m_stepSize = stepSize;
cannam@0:     m_blockSize = blockSize;
cannam@0: 
cannam@0:     return true;
cannam@0: }
cannam@0: 
cannam@0: void
cannam@0: SpectralCentroid::reset()
cannam@0: {
cannam@0: }
cannam@0: 
cannam@0: SpectralCentroid::OutputList
cannam@0: SpectralCentroid::getOutputDescriptors() const
cannam@0: {
cannam@0:     OutputList list;
cannam@0: 
cannam@0:     OutputDescriptor d;
cannam@0:     d.name = "logcentroid";
cannam@0:     d.unit = "Hz";
cannam@0:     d.description = "Log Frequency Centroid";
cannam@9:     d.hasFixedBinCount = true;
cannam@9:     d.binCount = 1;
cannam@0:     d.hasKnownExtents = false;
cannam@0:     d.isQuantized = false;
cannam@0:     d.sampleType = OutputDescriptor::OneSamplePerStep;
cannam@0:     list.push_back(d);
cannam@0: 
cannam@0:     d.name = "linearcentroid";
cannam@0:     d.description = "Linear Frequency Centroid";
cannam@0:     list.push_back(d);
cannam@0: 
cannam@0:     return list;
cannam@0: }
cannam@0: 
cannam@0: SpectralCentroid::FeatureSet
cannam@0: SpectralCentroid::process(float **inputBuffers, Vamp::RealTime)
cannam@0: {
cannam@0:     if (m_stepSize == 0) {
cannam@0: 	cerr << "ERROR: SpectralCentroid::process: "
cannam@0: 	     << "SpectralCentroid has not been initialised"
cannam@0: 	     << endl;
cannam@0: 	return FeatureSet();
cannam@0:     }
cannam@0: 
cannam@0:     double numLin = 0.0, numLog = 0.0, denom = 0.0;
cannam@0: 
cannam@0:     for (size_t i = 1; i < m_blockSize/2; ++i) {
cannam@0: 	double freq = (double(i) * m_inputSampleRate) / m_blockSize;
cannam@0: 	double real = inputBuffers[0][i*2];
cannam@0: 	double imag = inputBuffers[0][i*2 + 1];
cannam@0: 	double power = sqrt(real * real + imag * imag) / (m_blockSize/2);
cannam@0: 	numLin += freq * power;
cannam@0:         numLog += log10f(freq) * power;
cannam@0: 	denom += power;
cannam@0:     }
cannam@0: 
cannam@0:     FeatureSet returnFeatures;
cannam@0: 
cannam@13: //    std::cerr << "power " << denom << ", block size " << m_blockSize << std::endl;
cannam@0: 
cannam@0:     if (denom != 0.0) {
cannam@0: 	float centroidLin = float(numLin / denom);
cannam@19: 	float centroidLog = powf(10, float(numLog / denom));
cannam@0: 	Feature feature;
cannam@0: 	feature.hasTimestamp = false;
cannam@0: 	feature.values.push_back(centroidLog);
cannam@0: 	returnFeatures[0].push_back(feature);
cannam@0:         feature.values.clear();
cannam@0: 	feature.values.push_back(centroidLin);
cannam@0: 	returnFeatures[1].push_back(feature);
cannam@0:     }
cannam@0: 
cannam@0:     return returnFeatures;
cannam@0: }
cannam@0: 
cannam@0: SpectralCentroid::FeatureSet
cannam@0: SpectralCentroid::getRemainingFeatures()
cannam@0: {
cannam@0:     return FeatureSet();
cannam@0: }
cannam@0: