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clock: Make linear regression x/y base start from maximum observation.

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Project the results of the linear regression to the end of the
regression range, so they're more directly comparable to results
going forward
This commit is contained in:
Jan Schmidt 2015-02-05 22:55:39 +11:00
parent 08167e3234
commit 9d2b2768e3
1 changed files with 5 additions and 2 deletions
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7
gst/gstclock-linreg.c
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@ -217,8 +217,11 @@ _priv_gst_do_linear_regression (GstClockTime * times, guint n,
*m_num = sxy;
*m_denom = sxx;
*xbase = xmin;
*b = (ybar + ymin) - gst_util_uint64_scale (xbar, *m_num, *m_denom);
*b = (ymin + ybar) - gst_util_uint64_scale (xbar, *m_num, *m_denom);
/* Report base starting from the most recent observation */
*xbase = xmax;
*b += gst_util_uint64_scale (xmax - xmin, *m_num, *m_denom);
*r_squared = ((double) sxy * (double) sxy) / ((double) sxx * (double) syy);
#ifdef DEBUGGING_ENABLED