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vp9: Adjust condition of golden update with cyclic refresh.

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Base the low_content_frame metric on the motion vectors,
and adjust the logic for preventing golden update.

Small change in behavior: small positive gain (~0.2-1%) on clips
with high activity.

Change-Id: I0b861c8e9666cd82b45cde5ee57ee8a1e5ab453c
This commit is contained in:
Marco 2017-04-04 09:53:13 -07:00
parent 6b3f4bc794
commit 8097b49997
1 changed files with 7 additions and 3 deletions
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10
vp9/encoder/vp9_aq_cyclicrefresh.c
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@ -258,6 +258,7 @@ void vp9_cyclic_refresh_postencode(VP9_COMP *const cpi) {
cr->actual_num_seg2_blocks = 0;
for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) {
for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {
MV mv = mi[0]->mv[0].as_mv;
int map_index = mi_row * cm->mi_cols + mi_col;
if (cyclic_refresh_segment_id(seg_map[map_index]) == CR_SEGMENT_ID_BOOST1)
cr->actual_num_seg1_blocks++;
@ -265,7 +266,8 @@ void vp9_cyclic_refresh_postencode(VP9_COMP *const cpi) {
CR_SEGMENT_ID_BOOST2)
cr->actual_num_seg2_blocks++;
// Accumulate low_content_frame.
if (cr->map[map_index] < 1) low_content_frame++;
if (is_inter_block(mi[0]) && abs(mv.row) < 16 && abs(mv.col) < 16)
low_content_frame++;
mi++;
}
mi += 8;
@ -288,12 +290,14 @@ void vp9_cyclic_refresh_postencode(VP9_COMP *const cpi) {
// Update average of low content/motion in the frame.
fraction_low = (double)low_content_frame / (cm->mi_rows * cm->mi_cols);
cr->low_content_avg = (fraction_low + 3 * cr->low_content_avg) / 4;
if (!force_gf_refresh && cpi->refresh_golden_frame == 1) {
if (!force_gf_refresh && cpi->refresh_golden_frame == 1 &&
rc->frames_since_key > rc->frames_since_golden + 1) {
// Don't update golden reference if the amount of low_content for the
// current encoded frame is small, or if the recursive average of the
// low_content over the update interval window falls below threshold.
if (fraction_low < 0.8 || cr->low_content_avg < 0.7)
if (fraction_low < 0.65 || cr->low_content_avg < 0.6) {
cpi->refresh_golden_frame = 0;
}
// Reset for next internal.
cr->low_content_avg = fraction_low;
}