Chris@23: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@23: 
Chris@23: /*
Chris@23:     Vamp
Chris@23: 
Chris@23:     An API for audio analysis and feature extraction plugins.
Chris@23: 
Chris@23:     Centre for Digital Music, Queen Mary, University of London.
Chris@23:     Copyright 2008 QMUL.
Chris@23:   
Chris@23:     Permission is hereby granted, free of charge, to any person
Chris@23:     obtaining a copy of this software and associated documentation
Chris@23:     files (the "Software"), to deal in the Software without
Chris@23:     restriction, including without limitation the rights to use, copy,
Chris@23:     modify, merge, publish, distribute, sublicense, and/or sell copies
Chris@23:     of the Software, and to permit persons to whom the Software is
Chris@23:     furnished to do so, subject to the following conditions:
Chris@23: 
Chris@23:     The above copyright notice and this permission notice shall be
Chris@23:     included in all copies or substantial portions of the Software.
Chris@23: 
Chris@23:     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Chris@23:     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Chris@23:     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
Chris@23:     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
Chris@23:     ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
Chris@23:     CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Chris@23:     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Chris@23: 
Chris@23:     Except as contained in this notice, the names of the Centre for
Chris@23:     Digital Music; Queen Mary, University of London; and Chris Cannam
Chris@23:     shall not be used in advertising or otherwise to promote the sale,
Chris@23:     use or other dealings in this Software without prior written
Chris@23:     authorization.
Chris@23: */
Chris@23: 
Chris@23: #include "PowerSpectrum.h"
Chris@23: 
Chris@23: using std::string;
Chris@23: using std::cerr;
Chris@23: using std::endl;
Chris@23: 
Chris@23: #include <math.h>
Chris@23: 
Chris@23: PowerSpectrum::PowerSpectrum(float inputSampleRate) :
Chris@23:     Plugin(inputSampleRate),
Chris@23:     m_blockSize(0)
Chris@23: {
Chris@23: }
Chris@23: 
Chris@23: PowerSpectrum::~PowerSpectrum()
Chris@23: {
Chris@23: }
Chris@23: 
Chris@23: string
Chris@23: PowerSpectrum::getIdentifier() const
Chris@23: {
Chris@23:     return "powerspectrum";
Chris@23: }
Chris@23: 
Chris@23: string
Chris@23: PowerSpectrum::getName() const
Chris@23: {
Chris@23:     return "Simple Power Spectrum";
Chris@23: }
Chris@23: 
Chris@23: string
Chris@23: PowerSpectrum::getDescription() const
Chris@23: {
Chris@23:     return "Return the power spectrum of a signal";
Chris@23: }
Chris@23: 
Chris@23: string
Chris@23: PowerSpectrum::getMaker() const
Chris@23: {
Chris@23:     return "Vamp SDK Example Plugins";
Chris@23: }
Chris@23: 
Chris@23: int
Chris@23: PowerSpectrum::getPluginVersion() const
Chris@23: {
Chris@23:     return 1;
Chris@23: }
Chris@23: 
Chris@23: string
Chris@23: PowerSpectrum::getCopyright() const
Chris@23: {
Chris@23:     return "Freely redistributable (BSD license)";
Chris@23: }
Chris@23: 
Chris@23: bool
Chris@23: PowerSpectrum::initialise(size_t channels, size_t stepSize, size_t blockSize)
Chris@23: {
Chris@23:     if (channels < getMinChannelCount() ||
Chris@23: 	channels > getMaxChannelCount()) return false;
Chris@23: 
Chris@23:     m_blockSize = blockSize;
Chris@23: 
Chris@23:     return true;
Chris@23: }
Chris@23: 
Chris@23: void
Chris@23: PowerSpectrum::reset()
Chris@23: {
Chris@23: }
Chris@23: 
Chris@23: PowerSpectrum::OutputList
Chris@23: PowerSpectrum::getOutputDescriptors() const
Chris@23: {
Chris@23:     OutputList list;
Chris@23: 
Chris@23:     OutputDescriptor d;
Chris@23:     d.identifier = "powerspectrum";
Chris@23:     d.name = "Power Spectrum";
Chris@23:     d.description = "Power values of the frequency spectrum bins calculated from the input signal";
Chris@23:     d.unit = "";
Chris@23:     d.hasFixedBinCount = true;
Chris@23:     if (m_blockSize == 0) {
Chris@23:         // Just so as not to return "1".  This is the bin count that
Chris@23:         // would result from a block size of 1024, which is a likely
Chris@23:         // default -- but the host should always set the block size
Chris@23:         // before querying the bin count for certain.
Chris@23:         d.binCount = 513;
Chris@23:     } else {
Chris@23:         d.binCount = m_blockSize / 2 + 1;
Chris@23:     }
Chris@23:     d.hasKnownExtents = false;
Chris@23:     d.isQuantized = false;
Chris@23:     d.sampleType = OutputDescriptor::OneSamplePerStep;
Chris@23:     list.push_back(d);
Chris@23: 
Chris@23:     return list;
Chris@23: }
Chris@23: 
Chris@23: PowerSpectrum::FeatureSet
Chris@23: PowerSpectrum::process(const float *const *inputBuffers, Vamp::RealTime timestamp)
Chris@23: {
Chris@23:     FeatureSet fs;
Chris@23: 
Chris@23:     if (m_blockSize == 0) {
Chris@23: 	cerr << "ERROR: PowerSpectrum::process: Not initialised" << endl;
Chris@23: 	return fs;
Chris@23:     }
Chris@23: 
Chris@23:     size_t n = m_blockSize / 2 + 1;
Chris@23:     const float *fbuf = inputBuffers[0];
Chris@23: 
Chris@23:     Feature feature;
Chris@23:     feature.hasTimestamp = false;
Chris@23:     feature.values.reserve(n); // optional
Chris@23: 
Chris@23:     for (size_t i = 0; i < n; ++i) {
Chris@23: 
Chris@23: 	double real = fbuf[i * 2];
Chris@23: 	double imag = fbuf[i * 2 + 1];
Chris@23: 
Chris@23:         feature.values.push_back(real * real + imag * imag);
Chris@23:     }
Chris@23: 
Chris@23:     fs[0].push_back(feature);
Chris@23: 
Chris@23:     return fs;
Chris@23: }
Chris@23: 
Chris@23: PowerSpectrum::FeatureSet
Chris@23: PowerSpectrum::getRemainingFeatures()
Chris@23: {
Chris@23:     return FeatureSet();
Chris@23: }
Chris@23: