diff modules-and-plug-ins/python-module/btrack_python_module.cpp @ 72:f4d9410f187e

flow: Merged <release> '1.0.0' to <master> ('master').

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules-and-plug-ins/python-module/btrack_python_module.cpp	Tue Jul 08 12:32:27 2014 +0100
@@ -0,0 +1,312 @@
+#include <iostream>
+#include <Python.h>
+#include "../../src/OnsetDetectionFunction.h"
+#include "../../src/BTrack.h"
+#include <numpy/arrayobject.h>
+
+//=======================================================================
+static PyObject * btrack_trackBeats(PyObject *dummy, PyObject *args)
+{
+    PyObject *arg1=NULL;
+    PyObject *arr1=NULL;
+    
+    if (!PyArg_ParseTuple(args, "O", &arg1))
+    {
+        return NULL;
+    }
+    
+    arr1 = PyArray_FROM_OTF(arg1, NPY_DOUBLE, NPY_IN_ARRAY);
+    if (arr1 == NULL)
+    {
+        return NULL;
+    }
+    
+    
+    
+    ////////// GET INPUT DATA ///////////////////
+    
+    // get data as array
+    double* data = (double*) PyArray_DATA(arr1);
+    
+    // get array size
+    long signal_length = PyArray_Size((PyObject*)arr1);
+    
+    
+    ////////// BEGIN PROCESS ///////////////////
+    int hopSize = 512;
+    int frameSize = 1024;
+    
+    int numframes;
+    double buffer[hopSize];	// buffer to hold one hopsize worth of audio samples
+    
+    
+    // get number of audio frames, given the hop size and signal length
+	numframes = (int) floor(((double) signal_length) / ((double) hopSize));
+    
+    
+    BTrack b(hopSize,frameSize);
+    
+    
+    double beats[5000];
+    int beatnum = 0;
+    
+    ///////////////////////////////////////////
+	//////// Begin Processing Loop ////////////
+	
+	for (int i=0;i < numframes;i++)
+	{
+		// add new samples to frame
+		for (int n = 0;n < hopSize;n++)
+		{
+			buffer[n] = data[(i*hopSize)+n];
+		}
+		
+        // process the current audio frame
+        b.processAudioFrame(buffer);
+        
+        // if a beat is currently scheduled
+		if (b.beatDueInCurrentFrame())
+		{
+			beats[beatnum] = BTrack::getBeatTimeInSeconds(i,hopSize,44100);
+            beatnum = beatnum + 1;
+		}
+		
+	}
+	
+	///////// End Processing Loop /////////////
+	///////////////////////////////////////////
+    
+    
+    ////////// END PROCESS ///////////////////
+    
+    double beats_out[beatnum];          // create output array
+    
+    // copy beats into output array
+    for (int i = 0;i < beatnum;i++)
+    {
+        beats_out[i] = beats[i];
+    }
+    
+    
+    
+    ////////// CREATE ARRAY AND RETURN IT ///////////////////
+    int nd=1;
+    npy_intp m= beatnum;
+    //double fArray[5] = {0,1,2,3,4};
+    
+    PyObject* c=PyArray_SimpleNew(nd, &m, NPY_DOUBLE);
+    
+    void *arr_data = PyArray_DATA((PyArrayObject*)c);
+    
+    memcpy(arr_data, beats_out, PyArray_ITEMSIZE((PyArrayObject*) c) * m);
+    
+    
+    Py_DECREF(arr1);
+    Py_INCREF(Py_None);
+    //return Py_None;
+    
+    return (PyObject *)c;
+}
+
+
+//=======================================================================
+static PyObject * btrack_calculateOnsetDF(PyObject *dummy, PyObject *args)
+{
+    PyObject *arg1=NULL;
+    PyObject *arr1=NULL;
+    
+    if (!PyArg_ParseTuple(args, "O", &arg1)) 
+    {
+        return NULL;
+    }
+    
+    arr1 = PyArray_FROM_OTF(arg1, NPY_DOUBLE, NPY_IN_ARRAY); 
+    if (arr1 == NULL) 
+    {
+        return NULL;
+    }
+
+
+    
+    ////////// GET INPUT DATA ///////////////////
+    
+    // get data as array
+    double* data = (double*) PyArray_DATA(arr1);
+    
+    // get array size
+    long signal_length = PyArray_Size((PyObject*)arr1);
+    
+    ////////// BEGIN PROCESS ///////////////////
+    int hopSize = 512;
+    int frameSize = 1024;
+    int df_type = 6;
+    int numframes;
+    double buffer[hopSize];	// buffer to hold one hopsize worth of audio samples
+
+    
+    // get number of audio frames, given the hop size and signal length
+	numframes = (int) floor(((double) signal_length) / ((double) hopSize));
+    
+    OnsetDetectionFunction onset(hopSize,frameSize,df_type,1);
+
+    double df[numframes];
+    
+
+    
+    ///////////////////////////////////////////
+	//////// Begin Processing Loop ////////////
+	
+	for (int i=0;i < numframes;i++)
+	{		
+		// add new samples to frame
+		for (int n = 0;n < hopSize;n++)
+		{
+			buffer[n] = data[(i*hopSize)+n];
+		}
+		
+		df[i] = onset.calculateOnsetDetectionFunctionSample(buffer);
+		
+	}
+	
+	///////// End Processing Loop /////////////
+	///////////////////////////////////////////
+    
+    
+
+    
+    ////////// CREATE ARRAY AND RETURN IT ///////////////////
+    int nd=1;
+    npy_intp m= numframes;
+
+    
+    PyObject* c=PyArray_SimpleNew(nd, &m, NPY_DOUBLE);
+    
+    void *arr_data = PyArray_DATA((PyArrayObject*)c);
+        
+    memcpy(arr_data, df, PyArray_ITEMSIZE((PyArrayObject*) c) * m); 
+    
+     
+    Py_DECREF(arr1);  
+    Py_INCREF(Py_None); 
+    //return Py_None;
+    
+    return (PyObject *)c;
+}
+
+
+//=======================================================================
+static PyObject * btrack_trackBeatsFromOnsetDF(PyObject *dummy, PyObject *args)
+{
+    PyObject *arg1=NULL;
+    PyObject *arr1=NULL;
+    
+    if (!PyArg_ParseTuple(args, "O", &arg1)) 
+    {
+        return NULL;
+    }
+    
+    arr1 = PyArray_FROM_OTF(arg1, NPY_DOUBLE, NPY_IN_ARRAY); 
+    if (arr1 == NULL) 
+    {
+        return NULL;
+    }
+    
+    
+    
+    ////////// GET INPUT DATA ///////////////////
+    
+    // get data as array
+    double* data = (double*) PyArray_DATA(arr1);
+    
+    // get array size
+    long numframes = PyArray_Size((PyObject*)arr1);
+
+    ////////// BEGIN PROCESS ///////////////////
+    int hopSize = 512;
+    int frameSize = 2*hopSize;
+
+    BTrack b(hopSize,frameSize);
+    
+    double beats[5000];
+    int beatnum = 0;
+    double df_val;
+    
+    ///////////////////////////////////////////
+	//////// Begin Processing Loop ////////////
+	
+	for (long i=0;i < numframes;i++)
+	{		
+        df_val = data[i] + 0.0001;
+        
+		b.processOnsetDetectionFunctionSample(df_val);				// process df sample in beat tracker
+		
+		if (b.beatDueInCurrentFrame())
+		{
+            beats[beatnum] = BTrack::getBeatTimeInSeconds(i,hopSize,44100);
+			beatnum = beatnum + 1;	
+		}
+		
+	}
+	
+	///////// End Processing Loop /////////////
+	///////////////////////////////////////////
+    
+    
+    ////////// END PROCESS ///////////////////
+    
+    double beats_out[beatnum];          // create output array
+    
+    
+    // copy beats into output array
+    for (int i = 0;i < beatnum;i++)     
+    {
+        beats_out[i] = beats[i];
+    }
+    
+    
+    ////////// CREATE ARRAY AND RETURN IT ///////////////////
+    int nd=1;
+    npy_intp m= beatnum;
+    //double fArray[5] = {0,1,2,3,4};
+    
+    PyObject* c=PyArray_SimpleNew(nd, &m, NPY_DOUBLE);
+    
+    void *arr_data = PyArray_DATA((PyArrayObject*)c);
+    
+    memcpy(arr_data, beats_out, PyArray_ITEMSIZE((PyArrayObject*) c) * m); 
+    
+    
+    Py_DECREF(arr1);  
+    Py_INCREF(Py_None); 
+    //return Py_None;
+    
+    return (PyObject *)c;
+}
+
+//=======================================================================
+static PyMethodDef btrack_methods[] = {
+    { "calculateOnsetDF",btrack_calculateOnsetDF,METH_VARARGS,"Calculate the onset detection function"},
+    { "trackBeats",btrack_trackBeats,METH_VARARGS,"Track beats from audio"},
+    { "trackBeatsFromOnsetDF",btrack_trackBeatsFromOnsetDF,METH_VARARGS,"Track beats from an onset detection function"},
+    {NULL, NULL, 0, NULL} /* Sentinel */
+};
+
+//=======================================================================
+PyMODINIT_FUNC initbtrack(void)
+{
+    (void)Py_InitModule("btrack", btrack_methods);
+    import_array();
+}
+
+//=======================================================================
+int main(int argc, char *argv[])
+{
+    /* Pass argv[0] to the Python interpreter */
+    Py_SetProgramName(argv[0]);
+    
+    /* Initialize the Python interpreter.  Required. */
+    Py_Initialize();
+    
+    /* Add a static module */
+    initbtrack();
+}
\ No newline at end of file