comparison modules-and-plug-ins/vamp-plugin/BTrackVamp.cpp @ 24:deb49a2590f3 develop

Updated README, commented more code, added a Vamp plug-in

+
+// This is a skeleton file for use in creating your own plugin
+// libraries.  Replace BTrackVamp and myPlugin throughout with the name
+// of your first plugin class, and fill in the gaps as appropriate.
+
+
+#include "BTrackVamp.h"
+
+
+BTrackVamp::BTrackVamp(float inputSampleRate) :
+    Plugin(inputSampleRate)
+    // Also be sure to set your plugin parameters (presumably stored
+    // in member variables) to their default values here -- the host
+    // will not do that for you
+{
+}
+
+BTrackVamp::~BTrackVamp()
+{
+}
+
+string
+BTrackVamp::getIdentifier() const
+{
+    return "btrack-vamp";
+}
+
+string
+BTrackVamp::getName() const
+{
+    return "BTrack";
+}
+
+string
+BTrackVamp::getDescription() const
+{
+    // Return something helpful here!
+    return "A Real-Time Beat Tracker";
+}
+
+string
+BTrackVamp::getMaker() const
+{
+    // Your name here
+    return "Adam Stark, Matthew Davies and Mark Plumbley";
+}
+
+int
+BTrackVamp::getPluginVersion() const
+{
+    // Increment this each time you release a version that behaves
+    // differently from the previous one
+    return 1;
+}
+
+string
+BTrackVamp::getCopyright() const
+{
+    // This function is not ideally named.  It does not necessarily
+    // need to say who made the plugin -- getMaker does that -- but it
+    // should indicate the terms under which it is distributed.  For
+    // example, "Copyright (year). All Rights Reserved", or "GPL"
+    return "";
+}
+
+BTrackVamp::InputDomain
+BTrackVamp::getInputDomain() const
+{
+    return TimeDomain;
+}
+
+size_t
+BTrackVamp::getPreferredBlockSize() const
+{
+    return 1024; // 0 means "I can handle any block size"
+}
+
+size_t 
+BTrackVamp::getPreferredStepSize() const
+{
+    return 512; // 0 means "anything sensible"; in practice this
+              // means the same as the block size for TimeDomain
+              // plugins, or half of it for FrequencyDomain plugins
+}
+
+size_t
+BTrackVamp::getMinChannelCount() const
+{
+    return 1;
+}
+
+size_t
+BTrackVamp::getMaxChannelCount() const
+{
+    return 1;
+}
+
+BTrackVamp::ParameterList
+BTrackVamp::getParameterDescriptors() const
+{
+    ParameterList list;
+
+    // If the plugin has no adjustable parameters, return an empty
+    // list here (and there's no need to provide implementations of
+    // getParameter and setParameter in that case either).
+
+    // Note that it is your responsibility to make sure the parameters
+    // start off having their default values (e.g. in the constructor
+    // above).  The host needs to know the default value so it can do
+    // things like provide a "reset to default" function, but it will
+    // not explicitly set your parameters to their defaults for you if
+    // they have not changed in the mean time.
+
+//    ParameterDescriptor d;
+//    d.identifier = "parameter";
+//    d.name = "Some Parameter";
+//    d.description = "";
+//    d.unit = "";
+//    d.minValue = 0;
+//    d.maxValue = 10;
+//    d.defaultValue = 5;
+//    d.isQuantized = false;
+//    list.push_back(d);
+
+    return list;
+}
+
+float
+BTrackVamp::getParameter(string identifier) const
+{
+    if (identifier == "parameter") {
+        return 5; // return the ACTUAL current value of your parameter here!
+    }
+    return 0;
+}
+
+void
+BTrackVamp::setParameter(string identifier, float value) 
+{
+    if (identifier == "parameter") {
+        // set the actual value of your parameter
+    }
+}
+
+BTrackVamp::ProgramList
+BTrackVamp::getPrograms() const
+{
+    ProgramList list;
+
+    // If you have no programs, return an empty list (or simply don't
+    // implement this function or getCurrentProgram/selectProgram)
+
+    return list;
+}
+
+string
+BTrackVamp::getCurrentProgram() const
+{
+    return ""; // no programs
+}
+
+void
+BTrackVamp::selectProgram(string name)
+{
+}
+
+BTrackVamp::OutputList
+BTrackVamp::getOutputDescriptors() const
+{
+    OutputList list;
+
+    // See OutputDescriptor documentation for the possibilities here.
+    // Every plugin must have at least one output.
+    
+    OutputDescriptor d;
+    d.identifier = "beats";
+    d.name = "Beats";
+    d.description = "Beat locations";
+    d.unit = "";
+    d.hasFixedBinCount = true;
+    d.binCount = 0;
+    d.hasKnownExtents = false;
+    d.isQuantized = false;
+    d.sampleType = OutputDescriptor::VariableSampleRate;
+    d.sampleRate = m_inputSampleRate;
+    list.push_back(d);
+
+    return list;
+}
+
+bool
+BTrackVamp::initialise(size_t channels, size_t stepSize, size_t blockSize)
+{
+    if (channels < getMinChannelCount() ||
+	channels > getMaxChannelCount()) return false;
+
+    
+    m_stepSize = stepSize;
+    m_blockSize = blockSize;
+    
+    // Real initialisation work goes here!
+
+    return true;
+}
+
+void
+BTrackVamp::reset()
+{
+    // Clear buffers, reset stored values, etc
+}
+
+BTrackVamp::FeatureSet
+BTrackVamp::process(const float *const *inputBuffers, Vamp::RealTime timestamp)
+{
+    double frame[m_blockSize];
+    
+    for (int i = 0;i < m_blockSize;i++)
+    {
+        frame[i] = (double) inputBuffers[0][i];
+    }
+    
+    b.processAudioFrame(frame);
+    
+    FeatureSet featureSet;
+    
+    if (b.beatDueInCurrentFrame())
+    {
+        Feature beat;
+        beat.hasTimestamp = true;
+        beat.timestamp = timestamp - Vamp::RealTime::frame2RealTime(m_stepSize, int(m_inputSampleRate + 0.5));
+        featureSet[0].push_back(beat);
+    }
+    
+    // Do actual work!
+    return featureSet;
+}
+
+BTrackVamp::FeatureSet
+BTrackVamp::getRemainingFeatures()
+{
+    return FeatureSet();
+}
+