1 files changed, 54 insertions, 0 deletions
diff --git a/unittest/mksine.c b/unittest/mksine.c
new file mode 100644
index 0000000..a77830c
--- /dev/null
+++ b/unittest/mksine.c
@@ -0,0 +1,54 @@
+/*
+  mksine.c
+  David Rowe
+  10 Nov 2010
+
+  Creates a file of sine wave samples.
+*/
+
+#include <assert.h>
+#include <errno.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define TWO_PI 6.283185307
+#define FS 8000.0
+
+int main(int argc, char *argv[]) {
+  FILE *f;
+  int i, n;
+  float freq, length;
+  short *buf;
+  float amp = 1E4;
+
+  if (argc < 4) {
+    printf("usage: %s outputFile frequencyHz lengthSecs [PeakAmp]\n", argv[0]);
+    exit(1);
+  }
+
+  if (strcmp(argv[1], "-") == 0) {
+    f = stdout;
+  } else if ((f = fopen(argv[1], "wb")) == NULL) {
+    fprintf(stderr, "Error opening output file: %s: %s.\n", argv[3],
+            strerror(errno));
+    exit(1);
+  }
+  freq = atof(argv[2]);
+  length = atof(argv[3]);
+  if (argc == 5) amp = atof(argv[4]);
+
+  n = length * FS;
+  buf = (short *)malloc(sizeof(short) * n);
+  assert(buf != NULL);
+
+  for (i = 0; i < n; i++) buf[i] = amp * cos(freq * i * (TWO_PI / FS));
+
+  fwrite(buf, sizeof(short), n, f);
+
+  fclose(f);
+  free(buf);
+
+  return 0;
+}