#include "vp9/common/vp9_loopfilter.h"
#include "./vpx_scale_rtcd.h"
-// Enforce a minimum filter level based upon baseline Q
static int get_min_filter_level(VP9_COMP *cpi, int base_qindex) {
- int min_filter_level;
- min_filter_level = 0;
-
- return min_filter_level;
+ return 0;
}
-// Enforce a maximum filter level based upon baseline Q
static int get_max_filter_level(VP9_COMP *cpi, int base_qindex) {
- int max_filter_level = MAX_LOOP_FILTER;
- (void)base_qindex;
-
- if (cpi->twopass.section_intra_rating > 8)
- max_filter_level = MAX_LOOP_FILTER * 3 / 4;
-
- return max_filter_level;
+ return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
+ : MAX_LOOP_FILTER;
}
-
// Stub function for now Alt LF not used
void vp9_set_alt_lf_level(VP9_COMP *cpi, int filt_val) {
}
void vp9_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi, int partial) {
+ MACROBLOCKD *const xd = &cpi->mb.e_mbd;
VP9_COMMON *const cm = &cpi->common;
struct loopfilter *const lf = &cm->lf;
-
- int best_err = 0;
- int filt_err = 0;
const int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
const int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
-
- int filter_step;
- int filt_high = 0;
- // Start search at previous frame filter level
- int filt_mid = lf->filter_level;
- int filt_low = 0;
+ int best_err = 0;
+ int filt_err = 0;
int filt_best;
int filt_direction = 0;
-
- int Bias = 0; // Bias against raising loop filter in favor of lowering it.
-
- // Make a copy of the unfiltered / processed recon buffer
- vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
+ // Start the search at the previous frame filter level unless it is now out of
+ // range.
+ int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
+ int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0
: cpi->oxcf.sharpness;
- // Start the search at the previous frame filter level unless it is now out of
- // range.
- filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
-
- // Define the initial step size
- filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
+ // Make a copy of the unfiltered / processed recon buffer
+ vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
// Get baseline error score
vp9_set_alt_lf_level(cpi, filt_mid);
- vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_mid, 1, partial);
+ vp9_loop_filter_frame(cm, xd, filt_mid, 1, partial);
best_err = vp9_calc_ss_err(sd, cm->frame_to_show);
filt_best = filt_mid;
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
while (filter_step > 0) {
- Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
+ const int filt_high = MIN(filt_mid + filter_step, max_filter_level);
+ const int filt_low = MAX(filt_mid - filter_step, min_filter_level);
+
+ // Bias against raising loop filter in favor of lowering it.
+ int bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
if (cpi->twopass.section_intra_rating < 20)
- Bias = Bias * cpi->twopass.section_intra_rating / 20;
+ bias = bias * cpi->twopass.section_intra_rating / 20;
// yx, bias less for large block size
- if (cpi->common.tx_mode != ONLY_4X4)
- Bias >>= 1;
-
- filt_high = ((filt_mid + filter_step) > max_filter_level)
- ? max_filter_level
- : (filt_mid + filter_step);
- filt_low = ((filt_mid - filter_step) < min_filter_level)
- ? min_filter_level
- : (filt_mid - filter_step);
+ if (cm->tx_mode != ONLY_4X4)
+ bias >>= 1;
- if ((filt_direction <= 0) && (filt_low != filt_mid)) {
+ if (filt_direction <= 0 && filt_low != filt_mid) {
// Get Low filter error score
vp9_set_alt_lf_level(cpi, filt_low);
- vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_low, 1, partial);
+ vp9_loop_filter_frame(cm, xd, filt_low, 1, partial);
filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
- // Re-instate the unfiltered frame
+ // Re-instate the unfiltered frame
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
// If value is close to the best so far then bias towards a lower loop
// filter value.
- if ((filt_err - Bias) < best_err) {
+ if ((filt_err - bias) < best_err) {
// Was it actually better than the previous best?
if (filt_err < best_err)
best_err = filt_err;
}
// Now look at filt_high
- if ((filt_direction >= 0) && (filt_high != filt_mid)) {
+ if (filt_direction >= 0 && filt_high != filt_mid) {
vp9_set_alt_lf_level(cpi, filt_high);
- vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_high, 1, partial);
+ vp9_loop_filter_frame(cm, xd, filt_high, 1, partial);
filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
// Was it better than the previous best?
- if (filt_err < (best_err - Bias)) {
+ if (filt_err < (best_err - bias)) {
best_err = filt_err;
filt_best = filt_high;
}