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libs/libcodec2/unittest/polar2rect.c

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+/*
+  polar2rect.c
+  David Rowe 28 July 2013
+
+  Convert a file of sparse phases in polar (angle) format to a file in rect
+  format.
+*/
+
+#include <assert.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+typedef struct {
+    float real;
+    float imag;
+} COMP;
+
+int main(int argc, char *argv[]) {
+    FILE *fpolar;
+    FILE *frect;
+    float polar;
+    COMP  rect;
+
+    if (argc != 3) {
+	printf("usage: %s polarFile rectFile\n", argv[0]);
+	exit(0);
+    }
+
+    fpolar = fopen(argv[1], "rb");
+    assert(fpolar != NULL);
+    frect = fopen(argv[2], "wb");
+    assert(frect != NULL);
+
+    while (fread(&polar, sizeof(float), 1, fpolar) != 0) {
+	if (polar == 0.0) {
+	    /* this values indicates the VQ training should ignore
+	       this vector element.  It's not a valid phase as it
+	       doesn't have mangitude of 1.0 */
+	    rect.real = 0.0;
+	    rect.imag = 0.0;
+	}
+	else {
+	    rect.real = cos(polar);
+	    rect.imag = sin(polar);
+	}
+	fwrite(&rect, sizeof(COMP), 1, frect);
+    }
+
+    fclose(fpolar);
+    fclose(frect);
+
+    return 0;
+}