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[alsa] New resample-based sync correction

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ejurgensen
2019-04-08 00:50:20 +02:00
parent 781a3c16ed
commit 02cd65a992
5 changed files with 164 additions and 69 deletions
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35
src/misc.c
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@@ -1039,6 +1039,41 @@ murmur_hash64(const void *key, int len, uint32_t seed)
# error Platform not supported
#endif
int
linear_regression(double *m, double *b, double *r2, const double *x, const double *y, int n)
{
double x_val;
double sum_x = 0;
double sum_x2 = 0;
double sum_y = 0;
double sum_y2 = 0;
double sum_xy = 0;
double denom;
int i;
for (i = 0; i < n; i++)
{
x_val = x ? x[i] : (double)i;
sum_x += x_val;
sum_x2 += x_val * x_val;
sum_y += y[i];
sum_y2 += y[i] * y[i];
sum_xy += x_val * y[i];
}
denom = (n * sum_x2 - sum_x * sum_x);
if (denom == 0)
return -1;
*m = (n * sum_xy - sum_x * sum_y) / denom;
*b = (sum_y * sum_x2 - sum_x * sum_xy) / denom;
if (r2)
*r2 = (sum_xy - (sum_x * sum_y)/n) * (sum_xy - (sum_x * sum_y)/n) / ((sum_x2 - (sum_x * sum_x)/n) * (sum_y2 - (sum_y * sum_y)/n));
return 0;
}
bool
quality_is_equal(struct media_quality *a, struct media_quality *b)
{