48#define isinf(x) (!finite(x))
57 Plugin(inputSampleRate),
70 return "spectralcentroid";
76 return "Spectral Centroid";
82 return "Calculate the centroid frequency of the spectrum of the input signal";
88 return "Vamp SDK Example Plugins";
100 return "Freely redistributable (BSD license)";
127 d.
name =
"Log Frequency Centroid";
128 d.
description =
"Centroid of the log weighted frequency spectrum";
134 d.
sampleType = OutputDescriptor::OneSamplePerStep;
138 d.
name =
"Linear Frequency Centroid";
139 d.
description =
"Centroid of the linear frequency spectrum";
149 cerr <<
"ERROR: SpectralCentroid::process: "
150 <<
"SpectralCentroid has not been initialised"
155 double numLin = 0.0, numLog = 0.0, denom = 0.0;
159 double real = inputBuffers[0][i*2];
160 double imag = inputBuffers[0][i*2 + 1];
161 double scalemag = sqrt(real * real + imag * imag) / (
m_blockSize/2);
162 numLin += freq * scalemag;
163 numLog += log10f(freq) * scalemag;
170 float centroidLin = float(numLin / denom);
171 float centroidLog = powf(10,
float(numLog / denom));
176 if (!isnan(centroidLog) && !isinf(centroidLog)) {
177 feature.
values.push_back(centroidLog);
179 returnFeatures[0].push_back(feature);
182 if (!isnan(centroidLin) && !isinf(centroidLin)) {
183 feature.
values.push_back(centroidLin);
185 returnFeatures[1].push_back(feature);
188 return returnFeatures;
int getPluginVersion() const
Get the version number of the plugin.
SpectralCentroid(float inputSampleRate)
virtual ~SpectralCentroid()
std::string getIdentifier() const
Get the computer-usable name of the plugin.
FeatureSet getRemainingFeatures()
After all blocks have been processed, calculate and return any remaining features derived from the co...
void reset()
Reset the plugin after use, to prepare it for another clean run.
std::string getMaker() const
Get the name of the author or vendor of the plugin in human-readable form.
std::string getName() const
Get a human-readable name or title of the plugin.
bool initialise(size_t channels, size_t stepSize, size_t blockSize)
Initialise a plugin to prepare it for use with the given number of input channels,...
std::string getDescription() const
Get a human-readable description for the plugin, typically a line of text that may optionally be disp...
FeatureSet process(const float *const *inputBuffers, Vamp::RealTime timestamp)
Process a single block of input data.
OutputList getOutputDescriptors() const
Get the outputs of this plugin.
std::string getCopyright() const
Get the copyright statement or licensing summary for the plugin.
virtual size_t getMaxChannelCount() const
Get the maximum supported number of input channels.
std::vector< OutputDescriptor > OutputList
std::map< int, FeatureList > FeatureSet
virtual size_t getMinChannelCount() const
Get the minimum supported number of input channels.
std::vector< float > values
Results for a single sample of this feature.
bool hasTimestamp
True if an output feature has its own timestamp.
SampleType sampleType
Positioning in time of the output results.
bool isQuantized
True if the output values are quantized to a particular resolution.
std::string unit
The unit of the output, in human-readable form.
std::string name
The human-readable name of the output.
std::string identifier
The name of the output, in computer-usable form.
bool hasKnownExtents
True if the results in each output bin fall within a fixed numeric range (minimum and maximum values)...
bool hasFixedBinCount
True if the output has the same number of values per sample for every output sample.
std::string description
A human-readable short text describing the output.
size_t binCount
The number of values per result of the output.
RealTime represents time values to nanosecond precision with accurate arithmetic and frame-rate conve...