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vp9 svc: copy block if ref buffer in denoiser is NULL.

BUG=b/119097707

Change-Id: I6569306e897da46a44f9d8f2fb28a2a355dd4c2c

--- a/vp9/encoder/vp9_denoiser.c

+++ b/vp9/encoder/vp9_denoiser.c

@@ -263,6 +263,14 @@

     denoise_layer_idx = num_spatial_layers - spatial_layer - 1;

   }

+  // Force copy (no denoise, copy source in denoised buffer) if

+  // running_avg_y[frame] is NULL.

+  if (denoiser->running_avg_y[frame].buffer_alloc == NULL) {

+    // Restore everything to its original state

+    *mi = saved_mi;

+    return COPY_BLOCK;

+  }

+

   if (ctx->newmv_sse > sse_thresh(bs, increase_denoising)) {

     // Restore everything to its original state

     *mi = saved_mi;