48 #define isinf(x) (!finite(x))
52 #define isnan(x) false
53 #define isinf(x) false
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";
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;
std::vector< OutputDescriptor > OutputList
std::string getName() const
Get a human-readable name or title of the plugin.
bool hasFixedBinCount
True if the output has the same number of values per sample for every output sample.
std::vector< float > values
Results for a single sample of this feature.
std::map< int, FeatureList > FeatureSet
std::string getMaker() const
Get the name of the author or vendor of the plugin in human-readable form.
FeatureSet process(const float *const *inputBuffers, Vamp::RealTime timestamp)
Process a single block of input data.
void reset()
Reset the plugin after use, to prepare it for another clean run.
std::string description
A human-readable short text describing the output.
std::string getDescription() const
Get a human-readable description for the plugin, typically a line of text that may optionally be disp...
std::string identifier
The name of the output, in computer-usable form.
std::string getCopyright() const
Get the copyright statement or licensing summary for the plugin.
std::string getIdentifier() const
Get the computer-usable name of the plugin.
std::string unit
The unit of the output, in human-readable form.
OutputList getOutputDescriptors() const
Get the outputs of this plugin.
std::string name
The human-readable name of the output.
RealTime represents time values to nanosecond precision with accurate arithmetic and frame-rate conve...
bool hasTimestamp
True if an output feature has its own timestamp.
int getPluginVersion() const
Get the version number of the plugin.
SpectralCentroid(float inputSampleRate)
virtual ~SpectralCentroid()
Results from each process() align with that call's block start.
virtual size_t getMaxChannelCount() const
Get the maximum supported number of input channels.
size_t binCount
The number of values per result of the output.
bool isQuantized
True if the output values are quantized to a particular resolution.
virtual size_t getMinChannelCount() const
Get the minimum supported number of input channels.
SampleType sampleType
Positioning in time of the output results.
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, step size (window increment, in sample frames) and block size (window size, in sample frames).
bool hasKnownExtents
True if the results in each output bin fall within a fixed numeric range (minimum and maximum values)...
FeatureSet getRemainingFeatures()
After all blocks have been processed, calculate and return any remaining features derived from the co...