Commit 84520829 authored by Dmitry Kovalev's avatar Dmitry Kovalev
Browse files

Cleaning up get_prediction_decay_rate() function.

Change-Id: Ie8fcee21f41f91f94b4fa02f2a55691dea1734e3
parent f215c641
......@@ -1163,32 +1163,15 @@ void vp9_end_second_pass(VP9_COMP *cpi) {
// the prediction quality is decaying from frame to frame.
static double get_prediction_decay_rate(VP9_COMP *cpi,
FIRSTPASS_STATS *next_frame) {
double prediction_decay_rate;
double second_ref_decay;
double mb_sr_err_diff;
// Initial basis is the % mbs inter coded
prediction_decay_rate = next_frame->pcnt_inter;
// Look at the observed drop in prediction quality between the last frame
// and the GF buffer (which contains an older frame).
mb_sr_err_diff = (next_frame->sr_coded_error - next_frame->coded_error) /
cpi->common.MBs;
if (mb_sr_err_diff <= 512.0) {
second_ref_decay = 1.0 - (mb_sr_err_diff / 512.0);
second_ref_decay = pow(second_ref_decay, 0.5);
if (second_ref_decay < 0.85)
second_ref_decay = 0.85;
else if (second_ref_decay > 1.0)
second_ref_decay = 1.0;
} else {
second_ref_decay = 0.85;
}
if (second_ref_decay < prediction_decay_rate)
prediction_decay_rate = second_ref_decay;
const double mb_sr_err_diff = (next_frame->sr_coded_error -
next_frame->coded_error) / cpi->common.MBs;
const double second_ref_decay = mb_sr_err_diff <= 512.0
? fclamp(pow(1.0 - (mb_sr_err_diff / 512.0), 0.5), 0.85, 1.0)
: 0.85;
return prediction_decay_rate;
return MIN(second_ref_decay, next_frame->pcnt_inter);
}
// Function to test for a condition where a complex transition is followed
......
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