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Move library tree where it belongs
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170
lib-src/libvamp/examples/PowerSpectrum.cpp
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170
lib-src/libvamp/examples/PowerSpectrum.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 2008 QMUL.
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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 "PowerSpectrum.h"
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using std::string;
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using std::cerr;
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using std::endl;
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#include <math.h>
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PowerSpectrum::PowerSpectrum(float inputSampleRate) :
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Plugin(inputSampleRate),
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m_blockSize(0)
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{
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}
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PowerSpectrum::~PowerSpectrum()
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{
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}
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string
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PowerSpectrum::getIdentifier() const
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{
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return "powerspectrum";
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}
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string
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PowerSpectrum::getName() const
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{
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return "Simple Power Spectrum";
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}
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string
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PowerSpectrum::getDescription() const
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{
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return "Return the power spectrum of a signal";
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}
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string
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PowerSpectrum::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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PowerSpectrum::getPluginVersion() const
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{
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return 1;
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}
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string
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PowerSpectrum::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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PowerSpectrum::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_blockSize = blockSize;
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return true;
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}
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void
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PowerSpectrum::reset()
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{
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}
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PowerSpectrum::OutputList
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PowerSpectrum::getOutputDescriptors() const
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{
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OutputList list;
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OutputDescriptor d;
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d.identifier = "powerspectrum";
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d.name = "Power Spectrum";
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d.description = "Power values of the frequency spectrum bins calculated from the input signal";
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d.unit = "";
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d.hasFixedBinCount = true;
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if (m_blockSize == 0) {
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// Just so as not to return "1". This is the bin count that
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// would result from a block size of 1024, which is a likely
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// default -- but the host should always set the block size
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// before querying the bin count for certain.
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d.binCount = 513;
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} else {
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d.binCount = m_blockSize / 2 + 1;
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}
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d.hasKnownExtents = false;
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d.isQuantized = false;
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d.sampleType = OutputDescriptor::OneSamplePerStep;
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list.push_back(d);
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return list;
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}
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PowerSpectrum::FeatureSet
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PowerSpectrum::process(const float *const *inputBuffers, Vamp::RealTime timestamp)
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{
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FeatureSet fs;
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if (m_blockSize == 0) {
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cerr << "ERROR: PowerSpectrum::process: Not initialised" << endl;
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return fs;
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}
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size_t n = m_blockSize / 2 + 1;
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const float *fbuf = inputBuffers[0];
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Feature feature;
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feature.hasTimestamp = false;
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feature.values.reserve(n); // optional
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for (size_t i = 0; i < n; ++i) {
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double real = fbuf[i * 2];
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double imag = fbuf[i * 2 + 1];
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feature.values.push_back(real * real + imag * imag);
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}
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fs[0].push_back(feature);
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return fs;
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}
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PowerSpectrum::FeatureSet
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PowerSpectrum::getRemainingFeatures()
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{
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return FeatureSet();
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}
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