1 files changed, 54 insertions, 0 deletions
diff --git a/contrib/vorbis/lib/tone.c b/contrib/vorbis/lib/tone.c
new file mode 100644
index 0000000..5b8b020
--- /dev/null
+++ b/contrib/vorbis/lib/tone.c
@@ -0,0 +1,54 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+
+void usage(){
+  fprintf(stderr,"tone <frequency_Hz>,[<amplitude>] [<frequency_Hz>,[<amplitude>]...]\n");
+  exit(1);
+}
+
+int main (int argc,char *argv[]){
+  int i,j;
+  double *f;
+  double *amp;
+
+  if(argc<2)usage();
+
+  f=alloca(sizeof(*f)*(argc-1));
+  amp=alloca(sizeof(*amp)*(argc-1));
+
+  i=0;
+  while(argv[i+1]){
+    char *pos=strchr(argv[i+1],',');
+
+    f[i]=atof(argv[i+1]);
+    if(pos)
+      amp[i]=atof(pos+1)*32767.f;
+    else
+      amp[i]=32767.f;
+
+    fprintf(stderr,"%g Hz, %g amp\n",f[i],amp[i]);
+
+    i++;
+  }
+
+  for(i=0;i<44100*10;i++){
+    float val=0;
+    int ival;
+    for(j=0;j<argc-1;j++)
+      val+=amp[j]*sin(i/44100.f*f[j]*2*M_PI);
+    ival=rint(val);
+
+    if(ival>32767.f)ival=32767.f;
+    if(ival<-32768.f)ival=-32768.f;
+
+    fprintf(stdout,"%c%c%c%c",
+            (char)(ival&0xff),
+            (char)((ival>>8)&0xff),
+            (char)(ival&0xff),
+            (char)((ival>>8)&0xff));
+  }
+  return(0);
+}
+