generic-library/vpx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

vp9: SVC: Set downsample filtertype for lowest spatial layer.

Browse Source 
For lowest spatial layer, in 3 layer SVC, set the
downsampling filtertype to get averaging filter.
Needed for reducing aliasing on low-res layer,
small increase in overall encoder time.

Change-Id: Ia31460123bd91b72eca49b46dd924b9f226d4563
This commit is contained in:
Marco 2017-05-05 18:39:55 -07:00
parent a082c562d0
commit 9b729748ac
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
vp9/encoder/vp9_svc_layercontext.c
View File

@ -651,6 +651,10 @@ int vp9_one_pass_cbr_svc_start_layer(VP9_COMP *const cpi) {
lc->scaling_factor_num, lc->scaling_factor_den, &width,
&height);
// For 3 spatial layers, on the lowest resolution layer: set the filtertype
// for downsampling source to 1, to get averaging filter.
if (cpi->svc.number_spatial_layers == 3)
cpi->svc.filtertype_downsample_source[0] = 1;
// The usage of use_base_mv assumes down-scale of 2x2. For now, turn off use
// of base motion vectors if spatial scale factors for any layers are not 2,
// keep the case of 3 spatial layers with scale factor of 4x4 for base layer.