Commit 8c2ae2d5 authored by Alex Converse's avatar Alex Converse
Browse files

Refactor loop filter level search.

Factor out the code that tries filtering a frame at a given level.

Change-Id: Ia04507e3ce6b1ad6ae7d05a9d88222fd319f44b7
parent f9f936b8
......@@ -34,6 +34,22 @@ static int get_max_filter_level(VP9_COMP *cpi, int base_qindex) {
void vp9_set_alt_lf_level(VP9_COMP *cpi, int filt_val) {
}
static int try_filter_frame(const YV12_BUFFER_CONFIG *sd, VP9_COMP *const cpi,
MACROBLOCKD *const xd, VP9_COMMON *const cm,
int filt_level, int partial) {
int filt_err;
vp9_set_alt_lf_level(cpi, filt_level);
vp9_loop_filter_frame(cm, xd, filt_level, 1, partial);
filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
// Re-instate the unfiltered frame
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
return filt_err;
}
static void search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
int partial) {
MACROBLOCKD *const xd = &cpi->mb.e_mbd;
......@@ -41,8 +57,7 @@ static void search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
struct loopfilter *const lf = &cm->lf;
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 best_err = 0;
int filt_err = 0;
int best_err;
int filt_best;
int filt_direction = 0;
// Start the search at the previous frame filter level unless it is now out of
......@@ -53,16 +68,9 @@ static void search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
// 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, xd, filt_mid, 1, partial);
best_err = vp9_calc_ss_err(sd, cm->frame_to_show);
best_err = try_filter_frame(sd, cpi, xd, cm, filt_mid, partial);
filt_best = filt_mid;
// Re-instate the unfiltered frame
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
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);
......@@ -79,14 +87,7 @@ 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
vp9_set_alt_lf_level(cpi, filt_low);
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
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
int filt_err = try_filter_frame(sd, cpi, xd, cm, filt_low, partial);
// If value is close to the best so far then bias towards a lower loop
// filter value.
if ((filt_err - bias) < best_err) {
......@@ -100,14 +101,7 @@ 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) {
vp9_set_alt_lf_level(cpi, filt_high);
vp9_loop_filter_frame(cm, xd, filt_high, 1, partial);
filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
// Re-instate the unfiltered frame
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
int filt_err = try_filter_frame(sd, cpi, xd, cm, filt_high, partial);
// Was it better than the previous best?
if (filt_err < (best_err - bias)) {
best_err = filt_err;
......
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