static double latency_to_ratio (ping_context_t *ctx, /* {{{ */
double latency)
{
size_t low;
size_t high;
size_t index;
clean_history (ctx);
/* Not a single packet was received successfully. */
if (ctx->history_received == 0)
return NAN;
low = 0;
high = ctx->history_received - 1;
if (latency < ctx->history_by_value[low])
return 0.0;
else if (latency >= ctx->history_by_value[high])
return 100.0;
/* Do a binary search for the latency. This will work even when the
* exact latency is not in the array. If the latency is in the array
* multiple times, "low" will be set to the index of the last
* occurrence. The value at index "high" will be larger than the
* searched for latency (assured by the above "if" block. */
while ((high - low) > 1)
{
index = (high + low) / 2;
if (ctx->history_by_value[index] > latency)
high = index;
else
low = index;
}
assert (ctx->history_by_value[high] > latency);
assert (ctx->history_by_value[low] <= latency);
if (ctx->history_by_value[low] == latency)
index = low;
else
index = high;
return (((double) (index + 1)) / ((double) ctx->history_received));
} /* }}} double latency_to_ratio */
static double percentile_to_latency (ping_context_t *ctx, /* {{{ */
double percentile)
{
size_t index;
clean_history (ctx);
/* Not a single packet was received successfully. */
if (ctx->history_received == 0)
return NAN;
if (percentile <= 0.0)
index = 0;
else if (percentile >= 100.0)
index = ctx->history_received - 1;
else
{
index = (size_t) ceil ((percentile / 100.0) * ((double) ctx->history_received));
assert (index > 0);
index--;
}
return (ctx->history_by_value[index]);
} /* }}} double percentile_to_latency */
void config_iir(int srate, int bands, int original)
{
band_count = bands;
iir_cf = get_coeffs(&band_count, srate, original);
clean_history();
}
void uninit_equliazer()
{
clean_history();
}
