Commit f4b5076a authored by Marco's avatar Marco

vp9: Reduce qp threshold for limiting cyclic refresh on steady blocks.

Makes the delta-qp stop little earlier on areas that have been refreshed enough.
This helps to reduce some pulsing artifact on noisy flat areas observed in some
noisy vc-clips.

Threshold changes only take effect for sources where noise level is estimated to
be >= medium level.

Only affects 1 pass CBR, non-screen content case.

Change-Id: Iacf557f6aa8abbcd6782c02ff2e6c14891960850
parent 3d7e2677
......@@ -393,13 +393,18 @@ static void cyclic_refresh_update_map(VP9_COMP *const cpi) {
cr->target_num_seg_blocks = 0;
if (cpi->oxcf.content != VP9E_CONTENT_SCREEN) {
consec_zero_mv_thresh = 100;
if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium)
consec_zero_mv_thresh = 80;
}
qindex_thresh =
cpi->oxcf.content == VP9E_CONTENT_SCREEN
? vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST2, cm->base_qindex)
: vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST1, cm->base_qindex);
// More aggressive settings for noisy content.
if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium) {
consec_zero_mv_thresh = 80;
qindex_thresh =
VPXMAX(vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST1, cm->base_qindex),
7 * cm->base_qindex >> 3);
}
do {
int sum_map = 0;
// Get the mi_row/mi_col corresponding to superblock index i.
......@@ -463,6 +468,8 @@ void vp9_cyclic_refresh_update_parameters(VP9_COMP *const cpi) {
cr->percent_refresh = 5;
cr->max_qdelta_perc = 50;
cr->time_for_refresh = 0;
cr->motion_thresh = 32;
cr->rate_boost_fac = 15;
// Use larger delta-qp (increase rate_ratio_qdelta) for first few (~4)
// periods of the refresh cycle, after a key frame.
// Account for larger interval on base layer for temporal layers.
......@@ -472,9 +479,11 @@ void vp9_cyclic_refresh_update_parameters(VP9_COMP *const cpi) {
cr->rate_ratio_qdelta = 3.0;
} else {
cr->rate_ratio_qdelta = 2.0;
if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium)
// Reduce the delta-qp if the estimated source noise is above threshold.
cr->rate_ratio_qdelta = 1.5;
if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium) {
// Reduce the delta-qp if the estimated source noise is above threshold.
cr->rate_ratio_qdelta = 1.7;
cr->rate_boost_fac = 13;
}
}
// Adjust some parameters for low resolutions at low bitrates.
if (cm->width <= 352 &&
......@@ -482,9 +491,6 @@ void vp9_cyclic_refresh_update_parameters(VP9_COMP *const cpi) {
rc->avg_frame_bandwidth < 3400) {
cr->motion_thresh = 4;
cr->rate_boost_fac = 10;
} else {
cr->motion_thresh = 32;
cr->rate_boost_fac = 15;
}
if (cpi->svc.spatial_layer_id > 0) {
cr->motion_thresh = 4;
......
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