diff Code/Descriptors/yin/private/src/dftoperiod2.c @ 0:ea0c737c6323

first commit

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Code/Descriptors/yin/private/src/dftoperiod2.c	Thu Jul 26 14:46:25 2012 +0100
@@ -0,0 +1,144 @@
+/* 
+* dftoperiods.c
+* estimate period from df
+* 
+* Alain de Cheveigné, CNRS/Ircam	Dec 2001
+* (c) 2001 CNRS
+*/
+
+#include <math.h>
+#include "mex.h"
+
+/* #define MWRAP */
+#include "mwrap_check.h"
+
+/* Input Arguments */
+#define D_IN	prhs[0]
+#define B_IN	prhs[1]
+#define T_IN	prhs[2]
+
+/* output arguments */
+#define PRD_OUT	plhs[0]
+
+static void ddftoperiods(
+				double *dp,			/* input df */
+				double *bp,			/* bounds */
+				double *prdp, 		/* periods */
+				double thresh,		/* threshold */
+				int m,				/* nrows of df */
+				int n				/* ncols of df */
+			) 
+{
+	int j,k, p, lo, hi, maxj, goodflag;
+	double z, min, globalmin;
+	
+	/* bounds */
+	lo= GET(bp[0]);	
+	hi= GET(bp[1]);
+	if (lo<0 || hi>m ) {
+		mexPrintf("%d %d\n", lo, hi);
+		mexErrMsgTxt("DFTOPERIOD: bounds are out of bounds");
+	}
+
+	#define MARGIN 1.5
+
+	for (k=0;k<n;k++) {											/* for each col */
+	
+		goodflag=0;
+	
+		/* estimate global min */
+		globalmin=GET(dp[k*m+lo]);
+		for (j=lo;j<hi; j++) {									/* for each row	*/				
+			z = GET(dp[k*m+j]);
+			if (z<globalmin) {									/* update min & period estimate */
+				globalmin = z;
+			}
+		}
+		
+		thresh += globalmin;
+		
+		/* estimate period */
+		p=lo;
+		min=GET(dp[k*m+lo]);
+		maxj=hi;
+		for (j=lo;j<maxj; j++) {								/* for each row	*/				
+		
+			z = GET(dp[k*m+j]);
+			
+			if (z<thresh && z <= min) {							/* good candidate, restrict search range */
+				maxj=j*MARGIN; 
+				if (maxj> hi) { maxj = hi; }
+			}
+
+			if (z<min) {										/* update min & period estimate */
+				min = z;
+				p=j;
+			}
+			
+		}
+
+		/* mexPrintf("%f %d %f\n", thresh, p, min);  */
+
+		SET(prdp[k])=p;
+	}
+	
+	return;						
+}
+
+void mexFunction(
+				int nlhs, mxArray *plhs[],
+				int nrhs, const mxArray *prhs[]
+				)
+{
+	double	*dp, *bp, *tp, *prdp, thresh;
+	int m, n;
+	
+	/* Check for proper number of arguments */
+	if (nrhs != 3){
+		mexErrMsgTxt("DFTOPERIOD requires 3 input arguments");
+	}
+	
+	/* Check type of input */
+	if (!mxIsNumeric(D_IN) || mxIsComplex(D_IN) || 
+		mxIsSparse(D_IN)	|| !mxIsDouble(D_IN) ) {
+		mexErrMsgTxt("DFTOPERIOD: D should be doubles");
+	}
+	if (!mxIsNumeric(B_IN) || mxIsComplex(B_IN) || 
+		mxIsSparse(B_IN)	|| !mxIsDouble(B_IN) ) {
+		mexErrMsgTxt("DFTOPERIOD: B should be doubles");
+	}
+	if (!mxIsNumeric(T_IN) || mxIsComplex(T_IN) || 
+		mxIsSparse(T_IN)	|| !mxIsDouble(T_IN) ) {
+		mexErrMsgTxt("DFTOPERIOD: T should be double");
+	}
+	m=mxGetM(D_IN);		/* rows */
+	n=mxGetN(D_IN);		/* columns */
+
+	if (mxGetM(B_IN) * mxGetN(B_IN) != 2) {
+		mexErrMsgTxt("DFTOPERIOD: B should be a size 2 vector");
+	}
+	if (mxGetM(T_IN)*mxGetN(T_IN) != 1) {
+		mexErrMsgTxt("DFTOPERIOD: T should be scalar");
+	}
+
+	/* Create matrix to return */
+	PRD_OUT = mxCreateDoubleMatrix(1,n, mxREAL);	 
+
+	dp = mxGetPr(D_IN);
+	bp = mxGetPr(B_IN);
+	tp = mxGetPr(T_IN); thresh=tp[0];
+	prdp = mxGetPr(PRD_OUT);
+	
+	checkin_matrix((mxArray *) D_IN);
+	checkin_matrix((mxArray *) B_IN);
+	checkin_matrix((mxArray *) PRD_OUT);
+	
+	/* Do the actual computations in a subroutine */
+	ddftoperiods(dp,bp,prdp,thresh,m,n);
+
+	checkout_matrix((mxArray *) D_IN);
+	checkout_matrix((mxArray *) B_IN);
+	checkout_matrix((mxArray *) PRD_OUT);
+	return;
+}
+