Add cmd line option to control loopfilter for vpxenc

Change-Id: I4f5e6ce2f1b535a586bdb6c9e55a3d49ebf61af4
diff --git a/vpxenc.c b/vpxenc.c
index 64288e8..8c92f23 100644
--- a/vpxenc.c
+++ b/vpxenc.c
@@ -465,6 +465,13 @@
 static const arg_def_t row_mt =
     ARG_DEF(NULL, "row-mt", 1,
             "Enable row based non-deterministic multi-threading in VP9");
+
+static const arg_def_t disable_loopfilter =
+    ARG_DEF(NULL, "disable-loopfilter", 1,
+            "Control Loopfilter in VP9\n"
+            "0: Loopfilter on for all frames (default)\n"
+            "1: Loopfilter off for non reference frames\n"
+            "2: Loopfilter off for all frames");
 #endif
 
 #if CONFIG_VP9_ENCODER
@@ -495,6 +502,7 @@
                                        &max_gf_interval,
                                        &target_level,
                                        &row_mt,
+                                       &disable_loopfilter,
 #if CONFIG_VP9_HIGHBITDEPTH
                                        &bitdeptharg,
                                        &inbitdeptharg,
@@ -527,6 +535,7 @@
                                         VP9E_SET_MAX_GF_INTERVAL,
                                         VP9E_SET_TARGET_LEVEL,
                                         VP9E_SET_ROW_MT,
+                                        VP9E_SET_DISABLE_LOOPFILTER,
                                         0 };
 #endif