SPAN_DECLARE(dtmf_tx_state_t *) dtmf_tx_init(dtmf_tx_state_t *s)
{
if (s == NULL)
{
if ((s = (dtmf_tx_state_t *) malloc(sizeof (*s))) == NULL)
return NULL;
}
if (!dtmf_tx_inited)
dtmf_tx_initialise();
tone_gen_init(&(s->tones), &dtmf_digit_tones[0]);
dtmf_tx_set_level(s, DEFAULT_DTMF_TX_LEVEL, 0);
dtmf_tx_set_timing(s, -1, -1);
queue_init(&s->queue.queue, MAX_DTMF_DIGITS, QUEUE_READ_ATOMIC | QUEUE_WRITE_ATOMIC);
s->tones.current_section = -1;
return s;
}
SPAN_DECLARE(dtmf_tx_state_t *) dtmf_tx_init(dtmf_tx_state_t *s,
digits_tx_callback_t callback,
void *user_data)
{
if (s == NULL)
{
if ((s = (dtmf_tx_state_t *) malloc(sizeof (*s))) == NULL)
return NULL;
}
memset(s, 0, sizeof(*s));
if (!dtmf_tx_inited)
dtmf_tx_initialise();
s->callback = callback;
s->callback_data = user_data;
tone_gen_init(&s->tones, &dtmf_digit_tones[0]);
dtmf_tx_set_level(s, DEFAULT_DTMF_TX_LEVEL, 0);
dtmf_tx_set_timing(s, -1, -1);
queue_init(&s->queue.queue, MAX_DTMF_DIGITS, QUEUE_READ_ATOMIC | QUEUE_WRITE_ATOMIC);
s->tones.current_section = -1;
return s;
}
int main(int argc, char *argv[])
{
dtmf_tx_state_t *gen;
int16_t amp[16384];
int len;
SNDFILE *outhandle;
int add_digits;
if ((outhandle = sf_open_telephony_write(OUTPUT_FILE_NAME, 1)) == NULL)
{
fprintf(stderr, " Cannot open audio file '%s'\n", OUTPUT_FILE_NAME);
exit(2);
}
gen = dtmf_tx_init(NULL, NULL, NULL);
len = dtmf_tx(gen, amp, 16384);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "123", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 16384);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "456", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "789", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "*#", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
add_digits = 1;
do
{
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
if (len > 0)
sf_writef_short(outhandle, amp, len);
if (add_digits)
{
if (dtmf_tx_put(gen, "1234567890", -1))
{
printf("Digit buffer full\n");
add_digits = 0;
}
}
}
while (len > 0);
dtmf_tx_init(gen, NULL, NULL);
len = dtmf_tx(gen, amp, 16384);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "123", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 16384);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "456", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "789", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "0*#", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
if (dtmf_tx_put(gen, "ABCD", -1))
{
printf("Ooops\n");
exit(2);
}
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
sf_writef_short(outhandle, amp, len);
/* Try modifying the level and length of the digits */
printf("Try different levels and timing\n");
dtmf_tx_set_level(gen, -20, 5);
dtmf_tx_set_timing(gen, 100, 200);
if (dtmf_tx_put(gen, "123", -1))
{
printf("Ooops\n");
exit(2);
}
do
{
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
if (len > 0)
sf_writef_short(outhandle, amp, len);
}
while (len > 0);
printf("Restore normal levels and timing\n");
dtmf_tx_set_level(gen, -10, 0);
dtmf_tx_set_timing(gen, 50, 55);
if (dtmf_tx_put(gen, "A", -1))
{
printf("Ooops\n");
exit(2);
}
add_digits = TRUE;
do
{
len = dtmf_tx(gen, amp, 160);
printf("Generated %d samples\n", len);
if (len > 0)
sf_writef_short(outhandle, amp, len);
if (add_digits)
{
if (dtmf_tx_put(gen, "1234567890", -1))
{
printf("Digit buffer full\n");
add_digits = FALSE;
}
}
}
while (len > 0);
if (sf_close_telephony(outhandle))
{
fprintf(stderr, " Cannot close audio file '%s'\n", OUTPUT_FILE_NAME);
exit(2);
}
return 0;
}