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Cache loop filter errors.

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This avoids fitlering a frame multiple times at the same level.

Change-Id: I1fd54dd7ea257d16da8569f48036b8fad3a3ed61
This commit is contained in:
Alex Converse
2014-01-24 15:57:40 -08:00
parent 8c2ae2d5df
commit c0214e7155
1 changed files with 19 additions and 2 deletions
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21
vp9/encoder/vp9_picklpf.c
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@@ -64,16 +64,23 @@ static void search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
// range.
int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
// Sum squared error at each filter level
int ss_err[MAX_LOOP_FILTER + 1];
// Set each entry to -1
vpx_memset(ss_err, 0xFF, sizeof(ss_err));
// Make a copy of the unfiltered / processed recon buffer
vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
best_err = try_filter_frame(sd, cpi, xd, cm, filt_mid, partial);
filt_best = filt_mid;
ss_err[filt_mid] = best_err;
while (filter_step > 0) {
const int filt_high = MIN(filt_mid + filter_step, max_filter_level);
const int filt_low = MAX(filt_mid - filter_step, min_filter_level);
int filt_err;
// Bias against raising loop filter in favor of lowering it.
int bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
@@ -87,7 +94,12 @@ static void search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
if (filt_direction <= 0 && filt_low != filt_mid) {
// Get Low filter error score
int filt_err = try_filter_frame(sd, cpi, xd, cm, filt_low, partial);
if (ss_err[filt_low] < 0) {
filt_err = try_filter_frame(sd, cpi, xd, cm, filt_low, partial);
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) {
@@ -101,7 +113,12 @@ static void search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
// Now look at filt_high
if (filt_direction >= 0 && filt_high != filt_mid) {
int filt_err = try_filter_frame(sd, cpi, xd, cm, filt_high, partial);
if (ss_err[filt_high] < 0) {
filt_err = try_filter_frame(sd, cpi, xd, cm, filt_high, partial);
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)) {
best_err = filt_err;