Explicitly enable CDEF

It should already be enabled by default in libaom, but explicitly enable
it here in case that changes.

Bug: None
Change-Id: I93a1dfc92f9c02bc5ec823c326d8cf6ff163bceb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/184262
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Emil Lundmark <lndmrk@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32114}
diff --git a/modules/video_coding/codecs/av1/libaom_av1_encoder.cc b/modules/video_coding/codecs/av1/libaom_av1_encoder.cc
index b1c85b8..508a051 100644
--- a/modules/video_coding/codecs/av1/libaom_av1_encoder.cc
+++ b/modules/video_coding/codecs/av1/libaom_av1_encoder.cc
@@ -223,6 +223,12 @@
                         << " on control AV1E_SET_CPUUSED.";
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
+  ret = aom_codec_control(&ctx_, AV1E_SET_ENABLE_CDEF, 1);
+  if (ret != AOM_CODEC_OK) {
+    RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
+                        << " on control AV1E_SET_ENABLE_CDEF.";
+    return WEBRTC_VIDEO_CODEC_ERROR;
+  }
   ret = aom_codec_control(&ctx_, AV1E_SET_ENABLE_TPL_MODEL, 0);
   if (ret != AOM_CODEC_OK) {
     RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret