shithub: libvpx

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vp9-svc: Enbale scale partition reference frames.

For reference frames: enable scale partition for
superblocks with low source sad or if bsize on lower-resoln
is at least 32x32.

Keep feature disabled for base temporal layer.

Small regression in avgPNSR/SSIM metrics, ~0.5-1%.
Speedup ~2-3% on mac for SVC (3 spatial/3 temporal layers) at speed 7.

Change-Id: I5987eb7763845b680059128b538bb5188be0cca5

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -962,6 +962,12 @@

   // The block size is too big for boundaries. Do variance based partitioning.

   if ((!has_rows || !has_cols) && bsize_low > BLOCK_16X16) return 1;

+  // For reference frames: return 1 (do variance-based partitioning) if the

+  // superblock is not low source sad and lower-resoln bsize is below 32x32.

+  if (!cpi->svc.non_reference_frame && !x->skip_low_source_sad &&

+      bsize_low < BLOCK_32X32)

+    return 1;

+

   // Scale up block size by 2x2. Force 64x64 for size larger than 32x32.

   if (bsize_low < BLOCK_32X32) {

     bsize_high = bsize_low + 3;

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -607,10 +607,9 @@

     }

     // For SVC: enable use of lower resolution partition for higher resolution,

     // only for 3 spatial layers and when config/top resolution is above VGA.

-    // Enable only for top temporal enhancement layer (which are non-reference

-    // frames for the fixed SVC patterns).

+    // Enable only for non-base temporal layer frames.

     if (cpi->use_svc && cpi->svc.number_spatial_layers == 3 &&

-        cpi->svc.temporal_layer_id == cpi->svc.number_temporal_layers - 1 &&

+        cpi->svc.temporal_layer_id > 0 &&

         cpi->oxcf.width * cpi->oxcf.height > 640 * 480)

       sf->svc_use_lowres_part = 1;

   }