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Avoid multiple test for same lvl in auto filter lvl pick

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Sometimes same level is tested 2-3 times; store and reuse the
calculated error value.

Change-Id: Ia1c04a2568232edf9a5a62c4e2d8e8a50d85e00e
This commit is contained in:
Attila Nagy 2011-12-09 14:54:41 +02:00
parent c4aeff94b1
commit 51c4f9e6b1
1 changed files with 30 additions and 11 deletions
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41
vp8/encoder/picklpf.c
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@ -289,8 +289,12 @@ void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
int Bias = 0; // Bias against raising loop filter and in favor of lowering it
int ss_err[MAX_LOOP_FILTER];
YV12_BUFFER_CONFIG * saved_frame = cm->frame_to_show;
vpx_memset(ss_err, 0, sizeof(ss_err));
/* Replace unfiltered frame buffer with a new one */
cm->frame_to_show = &cpi->pick_lf_lvl_frame;
@ -320,6 +324,9 @@ void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
best_err = vp8_calc_ss_err(sd, cm->frame_to_show,
IF_RTCD(&cpi->rtcd.variance));
ss_err[filt_mid] = best_err;
filt_best = filt_mid;
while (filter_step > 0)
@ -335,13 +342,19 @@ void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
if ((filt_direction <= 0) && (filt_low != filt_mid))
{
// Get Low filter error score
vp8_yv12_copy_y_ptr(saved_frame, cm->frame_to_show);
vp8cx_set_alt_lf_level(cpi, filt_low);
vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low);
if(ss_err[filt_low] == 0)
{
// Get Low filter error score
vp8_yv12_copy_y_ptr(saved_frame, cm->frame_to_show);
vp8cx_set_alt_lf_level(cpi, filt_low);
vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low);
filt_err = vp8_calc_ss_err(sd, cm->frame_to_show,
IF_RTCD(&cpi->rtcd.variance));
filt_err = vp8_calc_ss_err(sd, cm->frame_to_show,
IF_RTCD(&cpi->rtcd.variance));
ss_err[filt_low] = filt_err;
}
else
filt_err = ss_err[filt_low];
// If value is close to the best so far then bias towards a lower loop filter value.
if ((filt_err - Bias) < best_err)
@ -357,12 +370,18 @@ void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
// Now look at filt_high
if ((filt_direction >= 0) && (filt_high != filt_mid))
{
vp8_yv12_copy_y_ptr(saved_frame, cm->frame_to_show);
vp8cx_set_alt_lf_level(cpi, filt_high);
vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high);
if(ss_err[filt_high] == 0)
{
vp8_yv12_copy_y_ptr(saved_frame, cm->frame_to_show);
vp8cx_set_alt_lf_level(cpi, filt_high);
vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high);
filt_err = vp8_calc_ss_err(sd, cm->frame_to_show,
IF_RTCD(&cpi->rtcd.variance));
filt_err = vp8_calc_ss_err(sd, cm->frame_to_show,
IF_RTCD(&cpi->rtcd.variance));
ss_err[filt_high] = filt_err;
}
else
filt_err = ss_err[filt_high];
// Was it better than the previous best?
if (filt_err < (best_err - Bias))