shithub: libvpx

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vp9-svc: Fix to skip enhancement layer setting

If in constrained layer drop mode, avoid setting
skip flag if base layer is dropped, as whole superframe
will be dropped in this case. This avoids an assert trigger
in the svc superframe packing.

Change-Id: I51c953c7fee979790c65c798bac9bd3d805dc66f

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -4692,8 +4692,13 @@

   TX_SIZE t;

   // SVC: skip encoding of enhancement layer if the layer target bandwidth = 0.

+  // If in constrained layer drop mode (svc.framedrop_mode != LAYER_DROP) and

+  // base spatial layer was dropped, no need to set svc.skip_enhancement_layer,

+  // as whole superframe will be dropped.

   if (cpi->use_svc && cpi->svc.spatial_layer_id > 0 &&

-      cpi->oxcf.target_bandwidth == 0) {

+      cpi->oxcf.target_bandwidth == 0 &&

+      !(cpi->svc.framedrop_mode != LAYER_DROP &&

+        cpi->svc.drop_spatial_layer[0])) {

     cpi->svc.skip_enhancement_layer = 1;

     vp9_rc_postencode_update_drop_frame(cpi);

     cpi->ext_refresh_frame_flags_pending = 0;