diff --git a/vp9/common/vp9_blockd.h b/vp9/common/vp9_blockd.h
index 4af521e..3231179 100644
--- a/vp9/common/vp9_blockd.h
+++ b/vp9/common/vp9_blockd.h
@@ -140,7 +140,7 @@
   // Flags used for prediction status of various bit-stream signals
   unsigned char seg_id_predicted;
 
-  INTERPOLATIONFILTERTYPE interp_filter;
+  INTERPOLATION_TYPE interp_filter;
 
   BLOCK_SIZE sb_type;
 } MB_MODE_INFO;
diff --git a/vp9/common/vp9_common.h b/vp9/common/vp9_common.h
index 3ac192b4..36d1cdf 100644
--- a/vp9/common/vp9_common.h
+++ b/vp9/common/vp9_common.h
@@ -84,9 +84,11 @@
   } while (0)
 #endif
 
-#define SYNC_CODE_0 0x49
-#define SYNC_CODE_1 0x83
-#define SYNC_CODE_2 0x42
+#define VP9_SYNC_CODE_0 0x49
+#define VP9_SYNC_CODE_1 0x83
+#define VP9_SYNC_CODE_2 0x42
+
+#define VP9_FRAME_MARKER 0x2
 
 
 #endif  // VP9_COMMON_VP9_COMMON_H_
diff --git a/vp9/common/vp9_filter.c b/vp9/common/vp9_filter.c
index cedd44c..8f24052 100644
--- a/vp9/common/vp9_filter.c
+++ b/vp9/common/vp9_filter.c
@@ -97,7 +97,7 @@
   { 0, -3,  1,  38, 64, 32, -1, -3}
 };
 
-const subpel_kernel *vp9_get_filter_kernel(INTERPOLATIONFILTERTYPE type) {
+const subpel_kernel *vp9_get_filter_kernel(INTERPOLATION_TYPE type) {
   switch (type) {
     case EIGHTTAP:
       return vp9_sub_pel_filters_8;
@@ -108,7 +108,7 @@
     case BILINEAR:
       return vp9_bilinear_filters;
     default:
-      assert(!"Invalid filter type.");
+      assert(!"Invalid interpolation type.");
       return NULL;
   }
 }
diff --git a/vp9/common/vp9_filter.h b/vp9/common/vp9_filter.h
index 3029453..8652a6e 100644
--- a/vp9/common/vp9_filter.h
+++ b/vp9/common/vp9_filter.h
@@ -27,7 +27,7 @@
   EIGHTTAP_SHARP = 2,
   BILINEAR = 3,
   SWITCHABLE = 4  /* should be the last one */
-} INTERPOLATIONFILTERTYPE;
+} INTERPOLATION_TYPE;
 
 typedef int16_t subpel_kernel[SUBPEL_TAPS];
 
@@ -36,7 +36,7 @@
   const subpel_kernel *filter_y;
 };
 
-const subpel_kernel *vp9_get_filter_kernel(INTERPOLATIONFILTERTYPE type);
+const subpel_kernel *vp9_get_filter_kernel(INTERPOLATION_TYPE type);
 
 extern const subpel_kernel vp9_bilinear_filters[SUBPEL_SHIFTS];
 extern const subpel_kernel vp9_sub_pel_filters_6[SUBPEL_SHIFTS];
diff --git a/vp9/common/vp9_onyxc_int.h b/vp9/common/vp9_onyxc_int.h
index 254da14..289210e 100644
--- a/vp9/common/vp9_onyxc_int.h
+++ b/vp9/common/vp9_onyxc_int.h
@@ -172,7 +172,7 @@
   // Persistent mb segment id map used in prediction.
   unsigned char *last_frame_seg_map;
 
-  INTERPOLATIONFILTERTYPE mcomp_filter_type;
+  INTERPOLATION_TYPE mcomp_filter_type;
 
   loop_filter_info_n lf_info;
 
diff --git a/vp9/common/vp9_reconinter.c b/vp9/common/vp9_reconinter.c
index 85020e2..53b9003 100644
--- a/vp9/common/vp9_reconinter.c
+++ b/vp9/common/vp9_reconinter.c
@@ -21,7 +21,7 @@
 #include "vp9/common/vp9_reconintra.h"
 
 void vp9_setup_interp_filters(MACROBLOCKD *xd,
-                              INTERPOLATIONFILTERTYPE mcomp_filter_type,
+                              INTERPOLATION_TYPE mcomp_filter_type,
                               VP9_COMMON *cm) {
   if (xd->mi_8x8 && xd->mi_8x8[0]) {
     MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
diff --git a/vp9/common/vp9_reconinter.h b/vp9/common/vp9_reconinter.h
index 610ee4a..2c8a6e4 100644
--- a/vp9/common/vp9_reconinter.h
+++ b/vp9/common/vp9_reconinter.h
@@ -25,7 +25,7 @@
                                    BLOCK_SIZE bsize);
 
 void vp9_setup_interp_filters(MACROBLOCKD *xd,
-                              INTERPOLATIONFILTERTYPE filter,
+                              INTERPOLATION_TYPE filter,
                               VP9_COMMON *cm);
 
 void vp9_build_inter_predictor(const uint8_t *src, int src_stride,
diff --git a/vp9/decoder/vp9_decodemv.c b/vp9/decoder/vp9_decodemv.c
index 33793ee..78c85b0 100644
--- a/vp9/decoder/vp9_decodemv.c
+++ b/vp9/decoder/vp9_decodemv.c
@@ -311,7 +311,7 @@
 }
 
 
-static INLINE INTERPOLATIONFILTERTYPE read_switchable_filter_type(
+static INLINE INTERPOLATION_TYPE read_switchable_filter_type(
     VP9_COMMON *const cm, MACROBLOCKD *const xd, vp9_reader *r) {
   const int ctx = vp9_get_pred_context_switchable_interp(xd);
   const int type = treed_read(r, vp9_switchable_interp_tree,
diff --git a/vp9/decoder/vp9_decodframe.c b/vp9/decoder/vp9_decodframe.c
index 08819e7..b415e25 100644
--- a/vp9/decoder/vp9_decodframe.c
+++ b/vp9/decoder/vp9_decodframe.c
@@ -569,12 +569,12 @@
   xd->itxm_add = xd->lossless ? vp9_iwht4x4_add : vp9_idct4x4_add;
 }
 
-static INTERPOLATIONFILTERTYPE read_interp_filter_type(
-    struct vp9_read_bit_buffer *rb) {
-  const INTERPOLATIONFILTERTYPE literal_to_type[] = { EIGHTTAP_SMOOTH,
-                                                      EIGHTTAP,
-                                                      EIGHTTAP_SHARP,
-                                                      BILINEAR };
+static INTERPOLATION_TYPE read_interp_filter_type(
+                              struct vp9_read_bit_buffer *rb) {
+  const INTERPOLATION_TYPE literal_to_type[] = { EIGHTTAP_SMOOTH,
+                                                 EIGHTTAP,
+                                                 EIGHTTAP_SHARP,
+                                                 BILINEAR };
   return vp9_rb_read_bit(rb) ? SWITCHABLE
                              : literal_to_type[vp9_rb_read_literal(rb, 2)];
 }
@@ -821,9 +821,9 @@
 }
 
 static void check_sync_code(VP9_COMMON *cm, struct vp9_read_bit_buffer *rb) {
-  if (vp9_rb_read_literal(rb, 8) != SYNC_CODE_0 ||
-      vp9_rb_read_literal(rb, 8) != SYNC_CODE_1 ||
-      vp9_rb_read_literal(rb, 8) != SYNC_CODE_2) {
+  if (vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_0 ||
+      vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_1 ||
+      vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_2) {
     vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
                        "Invalid frame sync code");
   }
@@ -875,7 +875,7 @@
 
   cm->last_frame_type = cm->frame_type;
 
-  if (vp9_rb_read_literal(rb, 2) != 0x2)
+  if (vp9_rb_read_literal(rb, 2) != VP9_FRAME_MARKER)
       vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
                          "Invalid frame marker");
 
diff --git a/vp9/encoder/vp9_bitstream.c b/vp9/encoder/vp9_bitstream.c
index 8378a78..b0cfee3 100644
--- a/vp9/encoder/vp9_bitstream.c
+++ b/vp9/encoder/vp9_bitstream.c
@@ -1103,7 +1103,7 @@
   }
 }
 
-static void write_interp_filter_type(INTERPOLATIONFILTERTYPE type,
+static void write_interp_filter_type(INTERPOLATION_TYPE type,
                                      struct vp9_write_bit_buffer *wb) {
   const int type_to_literal[] = { 1, 0, 2, 3 };
 
@@ -1295,17 +1295,16 @@
 }
 
 static void write_sync_code(struct vp9_write_bit_buffer *wb) {
-  vp9_wb_write_literal(wb, SYNC_CODE_0, 8);
-  vp9_wb_write_literal(wb, SYNC_CODE_1, 8);
-  vp9_wb_write_literal(wb, SYNC_CODE_2, 8);
+  vp9_wb_write_literal(wb, VP9_SYNC_CODE_0, 8);
+  vp9_wb_write_literal(wb, VP9_SYNC_CODE_1, 8);
+  vp9_wb_write_literal(wb, VP9_SYNC_CODE_2, 8);
 }
 
 static void write_uncompressed_header(VP9_COMP *cpi,
                                       struct vp9_write_bit_buffer *wb) {
   VP9_COMMON *const cm = &cpi->common;
 
-  // frame marker bits
-  vp9_wb_write_literal(wb, 0x2, 2);
+  vp9_wb_write_literal(wb, VP9_FRAME_MARKER, 2);
 
   // bitstream version.
   // 00 - profile 0. 4:2:0 only
diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index 98284a6..edb20ba 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -2188,7 +2188,7 @@
 
   if (cpi->sf.RD) {
     int i, pred_type;
-    INTERPOLATIONFILTERTYPE filter_type;
+    INTERPOLATION_TYPE filter_type;
     /*
      * This code does a single RD pass over the whole frame assuming
      * either compound, single or hybrid prediction as per whatever has
diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index d8098ed..d9a28c1 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -2621,7 +2621,7 @@
                                  int *rate_y, int64_t *distortion_y,
                                  int *rate_uv, int64_t *distortion_uv,
                                  int *mode_excluded, int *disable_skip,
-                                 INTERPOLATIONFILTERTYPE *best_filter,
+                                 INTERPOLATION_TYPE *best_filter,
                                  int_mv (*mode_mv)[MAX_REF_FRAMES],
                                  int mi_row, int mi_col,
                                  int_mv single_newmv[MAX_REF_FRAMES],
@@ -3123,7 +3123,7 @@
   int64_t best_inter_rd = INT64_MAX;
   MB_PREDICTION_MODE best_intra_mode = DC_PRED;
   MV_REFERENCE_FRAME best_inter_ref_frame = LAST_FRAME;
-  INTERPOLATIONFILTERTYPE tmp_best_filter = SWITCHABLE;
+  INTERPOLATION_TYPE tmp_best_filter = SWITCHABLE;
   int rate_uv_intra[TX_SIZES], rate_uv_tokenonly[TX_SIZES];
   int64_t dist_uv[TX_SIZES];
   int skip_uv[TX_SIZES];
@@ -3816,7 +3816,7 @@
   vp9_prob comp_mode_p;
   int64_t best_inter_rd = INT64_MAX;
   MV_REFERENCE_FRAME best_inter_ref_frame = LAST_FRAME;
-  INTERPOLATIONFILTERTYPE tmp_best_filter = SWITCHABLE;
+  INTERPOLATION_TYPE tmp_best_filter = SWITCHABLE;
   int rate_uv_intra[TX_SIZES], rate_uv_tokenonly[TX_SIZES];
   int64_t dist_uv[TX_SIZES];
   int skip_uv[TX_SIZES];
diff --git a/vp9/vp9_dx_iface.c b/vp9/vp9_dx_iface.c
index 6b92316..5dacab4 100644
--- a/vp9/vp9_dx_iface.c
+++ b/vp9/vp9_dx_iface.c
@@ -172,9 +172,9 @@
       rb.bit_offset += 1;  // show frame
       rb.bit_offset += 1;  // error resilient
 
-      if (vp9_rb_read_literal(&rb, 8) != SYNC_CODE_0 ||
-          vp9_rb_read_literal(&rb, 8) != SYNC_CODE_1 ||
-          vp9_rb_read_literal(&rb, 8) != SYNC_CODE_2) {
+      if (vp9_rb_read_literal(&rb, 8) != VP9_SYNC_CODE_0 ||
+          vp9_rb_read_literal(&rb, 8) != VP9_SYNC_CODE_1 ||
+          vp9_rb_read_literal(&rb, 8) != VP9_SYNC_CODE_2) {
         return VPX_CODEC_UNSUP_BITSTREAM;
       }