cosmetics: fix some typos

Change-Id: If5ac2725382fd8b4ddc134a055bcd79aaa8385f6
diff --git a/aom_dsp/aom_dsp_rtcd_defs.pl b/aom_dsp/aom_dsp_rtcd_defs.pl
index 7a4b1908..e821aba 100755
--- a/aom_dsp/aom_dsp_rtcd_defs.pl
+++ b/aom_dsp/aom_dsp_rtcd_defs.pl
@@ -178,7 +178,7 @@
 specialize qw/aom_smooth_predictor_32x16 ssse3/;
 specialize qw/aom_smooth_predictor_32x32 ssse3/;
 
-# TODO(yungingwang): optimize rectangular DC_PRED to replace division
+# TODO(yunqingwang): optimize rectangular DC_PRED to replace division
 # by multiply and shift.
 specialize qw/aom_dc_predictor_4x4 dspr2 msa neon sse2/;
 specialize qw/aom_dc_predictor_4x8 sse2/;
@@ -206,7 +206,7 @@
   specialize qw/aom_highbd_v_predictor_32x16 sse2/;
   specialize qw/aom_highbd_v_predictor_32x32 sse2/;
 
-  # TODO(yungingwang): optimize rectangular DC_PRED to replace division
+  # TODO(yunqingwang): optimize rectangular DC_PRED to replace division
   # by multiply and shift.
   specialize qw/aom_highbd_dc_predictor_4x4 sse2/;
   specialize qw/aom_highbd_dc_predictor_4x8 sse2/;
diff --git a/aomenc.c b/aomenc.c
index aff56ef..2886c07 100644
--- a/aomenc.c
+++ b/aomenc.c
@@ -168,7 +168,7 @@
 #if CONFIG_FILEOPTIONS
 static const arg_def_t use_cfg = ARG_DEF("c", "cfg", 1, "Config file to use");
 static const arg_def_t ext_partition =
-    ARG_DEF(NULL, "ext-partition", 1, "corresponds to exended partitions");
+    ARG_DEF(NULL, "ext-partition", 1, "corresponds to extended partitions");
 #endif
 
 static const struct arg_enum_list test_decode_enum[] = {
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index c3c8162..9147aaa 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -3753,12 +3753,12 @@
           // Very low chances to have copy tiles on the key frames, so don't
           // search on key frames to reduce unnecessary search.
           if (cm->frame_type != KEY_FRAME && tile_copy_mode) {
-            const int idendical_tile_offset =
+            const int identical_tile_offset =
                 find_identical_tile(tile_row, tile_col, tile_buffers);
 
-            if (idendical_tile_offset > 0) {
+            if (identical_tile_offset > 0) {
               tile_size = 0;
-              tile_header = idendical_tile_offset | 0x80;
+              tile_header = identical_tile_offset | 0x80;
               tile_header <<= 24;
             }
           }