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/* randnote.c
* generate random a random walk for musical notes and duration
* to feed to tones program to play random notes.
*
* Usage: randnote startnote [millisecs [iterations]]
*
* default millisecs is 250, default iterations is 1000
*/
#include <stdio.h>
char NT[6];
char Nl[]="CDEFGABC";
main(argc,argv)
int argc;
char **argv;
{
int i,f,Id,d,N,x;
argv++; argc--;
if (argc<1 || argc>3) {
printf("Usage: randnote start_note [duration [num_notes]]\n");
printf("\n start_note is letter[#]digit , where letter specifies the\n");
printf(" note, '#' is used to sharpen the note, and digit specifies the\n");
printf(" octave. Middle C is 'C3'.\n");
printf(" duration is in millisecs (def. 250), def num_notes is 1000\n");
exit(1);
}
Id=250; N=1000;
strncpy(NT,*argv,5); argv++; argc--;
NT[5]=0;
if (islower(NT[0])) NT[0]=toupper(NT[0]);
if (strlen(NT)!=2 || NT[0]<'A' || NT[0]>'G' || !isdigit(NT[1])) {
printf("Illegal start note. Use A-G followed by a single digit.\n");
exit(1);
}
f=((NT[0]-'C'+7)%7)+(NT[1]-'0')*7;
if (argc) {
Id=atoi(*argv++); argc--;
if (argc) {
N=atoi(*argv);
}
}
srandom(time(NULL)%(Id+f));
d=Id;
for (i=0; i<N; i++) {
printf("%c%c:%d\n",Nl[f%7],'0'+(f/7),d);
f+=((random()%11)-5);
if (f<7) f=14-f;
else if (f>69) f=70-f;
x=(random()%5)-2;
if (x>0) d=(Id<<x);
if (x<0) d=(Id>>(-x));
if (x==0) d=Id;
}
}
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