int
sock_get_floats(int purpose, double *vals, int num)
{
if (accept_if_needed(purpose) != -1)
return get_floats(purpose_table[purpose], vals, num);
return -1;
}
void begin(void)
{
int i;
FloatBuffer fb1, fb2, fb3, fb4;
LPFData lpf_data;
EqualizerData eq_data;
fb1.rpos = fb1.rlen = 0;
fb2.rpos = fb2.rlen = 0;
fb3.rpos = fb3.rlen = 0;
fb4.rpos = fb4.rlen = 0;
init_lpf_data(&lpf_data, CUTOFF_FREQUENCY, NUM_TAPS, DECIMATION);
init_equalizer(&eq_data);
/* Startup: */
get_floats(&fb1);
/* LPF needs at least NUM_TAPS+1 inputs; get_floats is fine. */
run_lpf(&fb1, &fb2, &lpf_data);
/* run_demod needs 1 input, OK here. */
/* run_equalizer needs 51 inputs (same reason as for LPF). This means
* running the pipeline up to demod 50 times in advance: */
for (i = 0; i < 64; i++)
{
if (fb1.rlen - fb1.rpos < NUM_TAPS + 1)
get_floats(&fb1);
run_lpf(&fb1, &fb2, &lpf_data);
run_demod(&fb2, &fb3);
}
/* Main loop: */
while (numiters == -1 || numiters-- > 0)
{
/* The low-pass filter will need NUM_TAPS+1 items; read them if we
* need to. */
if (fb1.rlen - fb1.rpos < NUM_TAPS + 1)
get_floats(&fb1);
run_lpf(&fb1, &fb2, &lpf_data);
run_demod(&fb2, &fb3);
run_equalizer(&fb3, &fb4, &eq_data);
write_floats(&fb4);
}
}
