diff modules-and-plug-ins/python-module/btrack_python_module.cpp @ 14:18fc3c248436 develop

Added a unit testing project, and did some commenting. Also moved python-module into a modules-and-plug-ins folder

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules-and-plug-ins/python-module/btrack_python_module.cpp	Tue Jan 21 10:24:33 2014 +0000
@@ -0,0 +1,362 @@
+#include <iostream>
+#include <Python.h>
+#include "../../src/OnsetDetectionFunction.h"
+#include "../../src/BTrack.h"
+#include <numpy/arrayobject.h>
+
+static PyObject * btrack_onsetdf(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
+    int signal_length = PyArray_Size((PyObject*)arr1);
+    //int k = (int) theSize;
+    
+    // get data type 
+    char type = PyArray_DESCR(arr1)->type;
+    
+    ////////// BEGIN PROCESS ///////////////////
+    int hsize = 512;
+    int fsize = 1024;
+    int df_type = 6;
+    int numframes;
+    double buffer[hsize];	// 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) hsize));
+    
+    OnsetDetectionFunction onset(hsize,fsize,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 < hsize;n++)
+		{
+			buffer[n] = data[(i*hsize)+n];
+		}
+		
+		df[i] = onset.getDFsample(buffer);
+		
+	}
+	
+	///////// End Processing Loop /////////////
+	///////////////////////////////////////////
+    
+    
+    ////////// END PROCESS ///////////////////
+    
+    
+    
+    ////////// CREATE ARRAY AND RETURN IT ///////////////////
+    int nd=1;
+    npy_intp m= numframes;
+    //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, df, PyArray_ITEMSIZE((PyArrayObject*) c) * m); 
+    
+     
+    Py_DECREF(arr1);  
+    Py_INCREF(Py_None); 
+    //return Py_None;
+    
+    return (PyObject *)c;
+    
+    //return Py_BuildValue("c", type);
+    //return Py_BuildValue("d", sum);
+    //return Py_BuildValue("i", k);
+/*    
+fail:
+    Py_XDECREF(arr1); 
+    Py_XDECREF(arr2); 
+    PyArray_XDECREF_ERR(oarr); 
+    return NULL;*/
+}
+
+
+static PyObject * btrack_btrack(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
+    int signal_length = PyArray_Size((PyObject*)arr1);
+    //int k = (int) theSize;
+    
+    // get data type 
+    char type = PyArray_DESCR(arr1)->type;
+    
+    ////////// BEGIN PROCESS ///////////////////
+    int hsize = 512;
+    int fsize = 1024;
+    int df_type = 6;
+    int numframes;
+    double buffer[hsize];	// 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) hsize));
+    
+    OnsetDetectionFunction onset(hsize,fsize,df_type,1);
+    BTrack b;
+    
+    b.initialise((int) hsize);	// initialise beat tracker
+	
+	// set parameters
+    //b.setparams(0.9,5);
+    
+    double df[numframes];
+    double beats[5000];
+    int beatnum = 0;
+    float df_val;
+    
+    ///////////////////////////////////////////
+	//////// Begin Processing Loop ////////////
+	
+	for (int i=0;i < numframes;i++)
+	{		
+		// add new samples to frame
+		for (int n = 0;n < hsize;n++)
+		{
+			buffer[n] = data[(i*hsize)+n];
+		}
+		
+		df[i] = onset.getDFsample(buffer);
+        
+        df_val = (float) (df[i] + 0.0001);
+                
+		b.process(df_val);				// process df sample in beat tracker
+		
+		if (b.playbeat == 1)
+		{
+			beats[beatnum] = (((double) hsize) / 44100) * ((double) i);
+			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;
+    
+    //return Py_BuildValue("c", type);
+    //return Py_BuildValue("d", sum);
+    //return Py_BuildValue("i", k);
+    /*    
+     fail:
+     Py_XDECREF(arr1); 
+     Py_XDECREF(arr2); 
+     PyArray_XDECREF_ERR(oarr); 
+     return NULL;*/
+}
+
+static PyObject * btrack_btrack_df(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
+    int numframes = PyArray_Size((PyObject*)arr1);
+    //int k = (int) theSize;
+    
+    // get data type 
+    char type = PyArray_DESCR(arr1)->type;
+    
+    ////////// BEGIN PROCESS ///////////////////
+    int hsize = 512;
+
+    BTrack b;
+    
+    b.initialise((int) hsize);	// initialise beat tracker
+	
+	// set parameters
+    //b.setparams(0.9,5);
+    
+    double beats[5000];
+    int beatnum = 0;
+    float df_val;
+    
+    ///////////////////////////////////////////
+	//////// Begin Processing Loop ////////////
+	
+	for (int i=0;i < numframes;i++)
+	{		
+        df_val = (float) (data[i] + 0.0001);
+        
+		b.process(df_val);				// process df sample in beat tracker
+		
+		if (b.playbeat == 1)
+		{
+			beats[beatnum] = (((double) hsize) / 44100) * ((double) i);
+			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;
+    
+    //return Py_BuildValue("c", type);
+    //return Py_BuildValue("d", sum);
+    //return Py_BuildValue("i", k);
+    /*    
+     fail:
+     Py_XDECREF(arr1); 
+     Py_XDECREF(arr2); 
+     PyArray_XDECREF_ERR(oarr); 
+     return NULL;*/
+}
+
+
+
+static PyMethodDef btrack_methods[] = {
+    { "onsetdf",btrack_onsetdf,METH_VARARGS,"onset detection function"},
+    { "btrack",btrack_btrack,METH_VARARGS,"beat tracker"},
+    { "btrack_df",btrack_btrack_df,METH_VARARGS,"beat tracker with detection function input"},
+    {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();
+}
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