/* makes wav file */
void makewav(const UL rate,const UL dlen){
const UL mlen=dlen+44;
UC*const m=malloc(mlen);
if(m){
wavhdr(m,rate,dlen);
makeaud(m+44,rate,dlen);
savefile("out.wav",m,mlen);
}
}
/* makes wav file */
void makertty(UL freq, UL baud, int DataBits, int StopBits, char *Message, char *Filename)
{
UL preamble_length, postamble_length, cycles_per_bit, cycles_per_byte, total_cycles, message_length;
UC* m;
FILE *f;
int i, NumberOfBits;
f = fopen(Filename,"wb");
// Calculate size of file
preamble_length = 20;
postamble_length = 10;
printf ("message=%s\n", Message);
EscapeCharactersIn(Message);
message_length = strlen(Message);
printf ("baud=%d\n", baud);
printf ("freq=%d\n", freq);
cycles_per_bit = freq / baud;
printf ("cycles_per_bit=%d\n", cycles_per_bit);
NumberOfBits = 1 + DataBits + StopBits;
cycles_per_byte = cycles_per_bit * NumberOfBits; // 1 stop 7 data 2 stop
printf ("cycles_per_byte=%d\n", cycles_per_byte);
total_cycles = (cycles_per_byte * message_length) + ((preamble_length + postamble_length) * cycles_per_bit);
// Make header
m = malloc(44);
wavhdr(m, freq, total_cycles);
// Write wav header
fwrite(m, 1, 44, f);
// Write preamble
for (i=0; i< preamble_length; i++)
{
make_and_write_bit(f, cycles_per_bit, 1);
}
// Create and write wav data
while (*Message)
{
make_and_write_byte(f, cycles_per_bit, DataBits, StopBits, *Message++);
}
// Write postamble
for (i=0; i< postamble_length; i++)
{
make_and_write_bit(f, cycles_per_bit, 1);
}
fclose(f);
}
