More stuff.

1 files changed, 30 insertions, 0 deletions

diff --git a/fgen.c b/fgen.c
new file mode 100644
index 0000000..10b9b51
--- /dev/null
+++ b/fgen.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+int main(int argc, char **argv)
+{
+        if (argc != 4) {
+                fprintf(stderr, "Usage: %s <sampling-frequency> <frequency> <duration> [amplitude]\n", argv[0]);
+                exit(1);
+        }
+
+        long int sfreq = strtol(argv[1], NULL, 10);
+        long double freq = strtod(argv[2], NULL);
+        if (freq <= 0) freq = 1;
+        long double duration = strtod(argv[3], NULL);
+        long double amplitude = 127;
+
+        if (argc == 5) {
+                amplitude = strtol(argv[4], NULL, 10);
+                if (amplitude > 127) amplitude = 127;
+                else if (amplitude < 0) amplitude = 0;
+        }
+
+        long double wave_length = sfreq / freq;
+
+        for (long int i = 0; i < duration / 1000 * sfreq; i++)
+                putchar((char)((sinf(i / wave_length * M_PI_2 * 4) + 1) * amplitude));
+
+        return 0;
+}