shithub: libvpx

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vp9-svc: Skip find_predictors based on ref_frame_flags.

Has some effect for SVC on base spatial layers (which only
reference LAST) or on upper spatial layers when inter_layer
prediction is disabled.

Small speedup on Mac of ~1%, for 3 layer SVC with inter-layer
prediction disabled.

Change-Id: I05be5da8843e0d32e9d85f6eb951cf1894e781d8

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1689,6 +1689,10 @@

   }

   for (ref_frame = LAST_FRAME; ref_frame <= usable_ref_frame; ++ref_frame) {

+    // Skip find_predictor if the reference frame is not in the

+    // ref_frame_flags (i.e., not used as a reference for this frame).

+    skip_ref_find_pred[ref_frame] =

+        !(cpi->ref_frame_flags & flag_list[ref_frame]);

     if (!skip_ref_find_pred[ref_frame]) {

       find_predictors(cpi, x, ref_frame, frame_mv, const_motion,

                       &ref_frame_skip_mask, flag_list, tile_data, mi_row,