libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_reconinter.c

+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include "vpx_ports/config.h"
+#include "vpx/vpx_integer.h"
+#include "vp9/common/vp9_blockd.h"
+#include "vp9/common/vp9_reconinter.h"
+#include "vp9/common/vp9_reconintra.h"
+
+void vp9_setup_interp_filters(MACROBLOCKD *xd,
+                              INTERPOLATIONFILTERTYPE mcomp_filter_type,
+                              VP9_COMMON *cm) {
+  if (mcomp_filter_type == SIXTAP) {
+    xd->subpixel_predict        = vp9_sixtap_predict;
+    xd->subpixel_predict8x4     = vp9_sixtap_predict8x4;
+    xd->subpixel_predict8x8     = vp9_sixtap_predict8x8;
+    xd->subpixel_predict16x16   = vp9_sixtap_predict16x16;
+    xd->subpixel_predict_avg    = vp9_sixtap_predict_avg;
+    xd->subpixel_predict_avg8x8 = vp9_sixtap_predict_avg8x8;
+    xd->subpixel_predict_avg16x16 = vp9_sixtap_predict_avg16x16;
+  } else if (mcomp_filter_type == EIGHTTAP || mcomp_filter_type == SWITCHABLE) {
+    xd->subpixel_predict        = vp9_eighttap_predict;
+    xd->subpixel_predict8x4     = vp9_eighttap_predict8x4;
+    xd->subpixel_predict8x8     = vp9_eighttap_predict8x8;
+    xd->subpixel_predict16x16   = vp9_eighttap_predict16x16;
+    xd->subpixel_predict_avg    = vp9_eighttap_predict_avg4x4;
+    xd->subpixel_predict_avg8x8 = vp9_eighttap_predict_avg8x8;
+    xd->subpixel_predict_avg16x16 = vp9_eighttap_predict_avg16x16;
+  } else if (mcomp_filter_type == EIGHTTAP_SHARP) {
+    xd->subpixel_predict        = vp9_eighttap_predict_sharp;
+    xd->subpixel_predict8x4     = vp9_eighttap_predict8x4_sharp;
+    xd->subpixel_predict8x8     = vp9_eighttap_predict8x8_sharp;
+    xd->subpixel_predict16x16   = vp9_eighttap_predict16x16_sharp;
+    xd->subpixel_predict_avg    = vp9_eighttap_predict_avg4x4_sharp;
+    xd->subpixel_predict_avg8x8 = vp9_eighttap_predict_avg8x8_sharp;
+    xd->subpixel_predict_avg16x16 = vp9_eighttap_predict_avg16x16_sharp_c;
+  }
+  else {
+    xd->subpixel_predict        = vp9_bilinear_predict4x4;
+    xd->subpixel_predict8x4     = vp9_bilinear_predict8x4;
+    xd->subpixel_predict8x8     = vp9_bilinear_predict8x8;
+    xd->subpixel_predict16x16   = vp9_bilinear_predict16x16;
+    xd->subpixel_predict_avg    = vp9_bilinear_predict_avg4x4;
+    xd->subpixel_predict_avg8x8 = vp9_bilinear_predict_avg8x8;
+    xd->subpixel_predict_avg16x16 = vp9_bilinear_predict_avg16x16;
+  }
+}
+
+void vp9_copy_mem16x16_c(unsigned char *src,
+                         int src_stride,
+                         unsigned char *dst,
+                         int dst_stride) {
+  int r;
+
+  for (r = 0; r < 16; r++) {
+#if !(CONFIG_FAST_UNALIGNED)
+    dst[0] = src[0];
+    dst[1] = src[1];
+    dst[2] = src[2];
+    dst[3] = src[3];
+    dst[4] = src[4];
+    dst[5] = src[5];
+    dst[6] = src[6];
+    dst[7] = src[7];
+    dst[8] = src[8];
+    dst[9] = src[9];
+    dst[10] = src[10];
+    dst[11] = src[11];
+    dst[12] = src[12];
+    dst[13] = src[13];
+    dst[14] = src[14];
+    dst[15] = src[15];
+
+#else
+    ((uint32_t *)dst)[0] = ((uint32_t *)src)[0];
+    ((uint32_t *)dst)[1] = ((uint32_t *)src)[1];
+    ((uint32_t *)dst)[2] = ((uint32_t *)src)[2];
+    ((uint32_t *)dst)[3] = ((uint32_t *)src)[3];
+
+#endif
+    src += src_stride;
+    dst += dst_stride;
+  }
+}
+
+void vp9_avg_mem16x16_c(unsigned char *src,
+                        int src_stride,
+                        unsigned char *dst,
+                        int dst_stride) {
+  int r;
+
+  for (r = 0; r < 16; r++) {
+    int n;
+
+    for (n = 0; n < 16; n++) {
+      dst[n] = (dst[n] + src[n] + 1) >> 1;
+    }
+
+    src += src_stride;
+    dst += dst_stride;
+  }
+}
+
+void vp9_copy_mem8x8_c(unsigned char *src,
+                       int src_stride,
+                       unsigned char *dst,
+                       int dst_stride) {
+  int r;
+
+  for (r = 0; r < 8; r++) {
+#if !(CONFIG_FAST_UNALIGNED)
+    dst[0] = src[0];
+    dst[1] = src[1];
+    dst[2] = src[2];
+    dst[3] = src[3];
+    dst[4] = src[4];
+    dst[5] = src[5];
+    dst[6] = src[6];
+    dst[7] = src[7];
+#else
+    ((uint32_t *)dst)[0] = ((uint32_t *)src)[0];
+    ((uint32_t *)dst)[1] = ((uint32_t *)src)[1];
+#endif
+    src += src_stride;
+    dst += dst_stride;
+  }
+}
+
+void vp9_avg_mem8x8_c(unsigned char *src,
+                      int src_stride,
+                      unsigned char *dst,
+                      int dst_stride) {
+  int r;
+
+  for (r = 0; r < 8; r++) {
+    int n;
+
+    for (n = 0; n < 8; n++) {
+      dst[n] = (dst[n] + src[n] + 1) >> 1;
+    }
+
+    src += src_stride;
+    dst += dst_stride;
+  }
+}
+
+void vp9_copy_mem8x4_c(unsigned char *src,
+                       int src_stride,
+                       unsigned char *dst,
+                       int dst_stride) {
+  int r;
+
+  for (r = 0; r < 4; r++) {
+#if !(CONFIG_FAST_UNALIGNED)
+    dst[0] = src[0];
+    dst[1] = src[1];
+    dst[2] = src[2];
+    dst[3] = src[3];
+    dst[4] = src[4];
+    dst[5] = src[5];
+    dst[6] = src[6];
+    dst[7] = src[7];
+#else
+    ((uint32_t *)dst)[0] = ((uint32_t *)src)[0];
+    ((uint32_t *)dst)[1] = ((uint32_t *)src)[1];
+#endif
+    src += src_stride;
+    dst += dst_stride;
+  }
+}
+
+void vp9_build_inter_predictors_b(BLOCKD *d, int pitch, vp9_subpix_fn_t sppf) {
+  int r;
+  unsigned char *ptr_base;
+  unsigned char *ptr;
+  unsigned char *pred_ptr = d->predictor;
+  int_mv mv;
+
+  ptr_base = *(d->base_pre);
+  mv.as_int = d->bmi.as_mv.first.as_int;
+
+  if (mv.as_mv.row & 7 || mv.as_mv.col & 7) {
+    ptr = ptr_base + d->pre + (mv.as_mv.row >> 3) * d->pre_stride +
+          (mv.as_mv.col >> 3);
+    sppf(ptr, d->pre_stride, (mv.as_mv.col & 7) << 1, (mv.as_mv.row & 7) << 1,
+         pred_ptr, pitch);
+  } else {
+    ptr_base += d->pre + (mv.as_mv.row >> 3) * d->pre_stride +
+                (mv.as_mv.col >> 3);
+    ptr = ptr_base;
+
+    for (r = 0; r < 4; r++) {
+#if !(CONFIG_FAST_UNALIGNED)
+      pred_ptr[0]  = ptr[0];
+      pred_ptr[1]  = ptr[1];
+      pred_ptr[2]  = ptr[2];
+      pred_ptr[3]  = ptr[3];
+#else
+      *(uint32_t *)pred_ptr = *(uint32_t *)ptr;
+#endif
+      pred_ptr     += pitch;
+      ptr         += d->pre_stride;
+    }
+  }
+}
+
+/*
+ * Similar to vp9_build_inter_predictors_b(), but instead of storing the
+ * results in d->predictor, we average the contents of d->predictor (which
+ * come from an earlier call to vp9_build_inter_predictors_b()) with the
+ * predictor of the second reference frame / motion vector.
+ */
+void vp9_build_2nd_inter_predictors_b(BLOCKD *d, int pitch,
+                                      vp9_subpix_fn_t sppf) {
+  int r;
+  unsigned char *ptr_base;
+  unsigned char *ptr;
+  unsigned char *pred_ptr = d->predictor;
+  int_mv mv;
+
+  ptr_base = *(d->base_second_pre);
+  mv.as_int = d->bmi.as_mv.second.as_int;
+
+  if (mv.as_mv.row & 7 || mv.as_mv.col & 7) {
+    ptr = ptr_base + d->pre + (mv.as_mv.row >> 3) * d->pre_stride +
+          (mv.as_mv.col >> 3);
+    sppf(ptr, d->pre_stride, (mv.as_mv.col & 7) << 1, (mv.as_mv.row & 7) << 1,
+         pred_ptr, pitch);
+  } else {
+    ptr_base += d->pre + (mv.as_mv.row >> 3) * d->pre_stride +
+                (mv.as_mv.col >> 3);
+    ptr = ptr_base;
+
+    for (r = 0; r < 4; r++) {
+      pred_ptr[0]  = (pred_ptr[0] + ptr[0] + 1) >> 1;
+      pred_ptr[1]  = (pred_ptr[1] + ptr[1] + 1) >> 1;
+      pred_ptr[2]  = (pred_ptr[2] + ptr[2] + 1) >> 1;
+      pred_ptr[3]  = (pred_ptr[3] + ptr[3] + 1) >> 1;
+      pred_ptr    += pitch;
+      ptr         += d->pre_stride;
+    }
+  }
+}
+
+void vp9_build_inter_predictors4b(MACROBLOCKD *xd, BLOCKD *d, int pitch) {
+  unsigned char *ptr_base;
+  unsigned char *ptr;
+  unsigned char *pred_ptr = d->predictor;
+  int_mv mv;
+
+  ptr_base = *(d->base_pre);
+  mv.as_int = d->bmi.as_mv.first.as_int;
+  ptr = ptr_base + d->pre + (mv.as_mv.row >> 3) * d->pre_stride +
+        (mv.as_mv.col >> 3);
+
+  if (mv.as_mv.row & 7 || mv.as_mv.col & 7) {
+    xd->subpixel_predict8x8(ptr, d->pre_stride, (mv.as_mv.col & 7) << 1,
+                            (mv.as_mv.row & 7) << 1, pred_ptr, pitch);
+  } else {
+    vp9_copy_mem8x8(ptr, d->pre_stride, pred_ptr, pitch);
+  }
+}
+
+/*
+ * Similar to build_inter_predictors_4b(), but instead of storing the
+ * results in d->predictor, we average the contents of d->predictor (which
+ * come from an earlier call to build_inter_predictors_4b()) with the
+ * predictor of the second reference frame / motion vector.
+ */
+void vp9_build_2nd_inter_predictors4b(MACROBLOCKD *xd,
+                                      BLOCKD *d, int pitch) {
+  unsigned char *ptr_base;
+  unsigned char *ptr;
+  unsigned char *pred_ptr = d->predictor;
+  int_mv mv;
+
+  ptr_base = *(d->base_second_pre);
+  mv.as_int = d->bmi.as_mv.second.as_int;
+  ptr = ptr_base + d->pre + (mv.as_mv.row >> 3) * d->pre_stride +
+        (mv.as_mv.col >> 3);
+
+  if (mv.as_mv.row & 7 || mv.as_mv.col & 7) {
+    xd->subpixel_predict_avg8x8(ptr, d->pre_stride, (mv.as_mv.col & 7) << 1,
+                               (mv.as_mv.row & 7) << 1, pred_ptr, pitch);
+  } else {
+    vp9_avg_mem8x8(ptr, d->pre_stride, pred_ptr, pitch);
+  }
+}
+
+static void build_inter_predictors2b(MACROBLOCKD *xd, BLOCKD *d, int pitch) {
+  unsigned char *ptr_base;
+  unsigned char *ptr;
+  unsigned char *pred_ptr = d->predictor;
+  int_mv mv;
+
+  ptr_base = *(d->base_pre);
+  mv.as_int = d->bmi.as_mv.first.as_int;
+  ptr = ptr_base + d->pre + (mv.as_mv.row >> 3) * d->pre_stride +
+        (mv.as_mv.col >> 3);
+
+  if (mv.as_mv.row & 7 || mv.as_mv.col & 7) {
+    xd->subpixel_predict8x4(ptr, d->pre_stride, (mv.as_mv.col & 7) << 1,
+                           (mv.as_mv.row & 7) << 1, pred_ptr, pitch);
+  } else {
+    vp9_copy_mem8x4(ptr, d->pre_stride, pred_ptr, pitch);
+  }
+}
+
+
+/*encoder only*/
+#if CONFIG_PRED_FILTER
+
+// Select the thresholded or non-thresholded filter
+#define USE_THRESH_FILTER 0
+
+#define PRED_FILT_LEN 5
+
+static const int filt_shift = 4;
+static const int pred_filter[PRED_FILT_LEN] = {1, 2, 10, 2, 1};
+// Alternative filter {1, 1, 4, 1, 1}
+
+#if !USE_THRESH_FILTER
+void filter_mb(unsigned char *src, int src_stride,
+               unsigned char *dst, int dst_stride,
+               int width, int height) {
+  int i, j, k;
+  unsigned int Temp[32 * 32];
+  unsigned int  *pTmp = Temp;
+  unsigned char *pSrc = src - (1 + src_stride) * (PRED_FILT_LEN / 2);
+
+  // Horizontal
+  for (i = 0; i < height + PRED_FILT_LEN - 1; i++) {
+    for (j = 0; j < width; j++) {
+      int sum = 0;
+      for (k = 0; k < PRED_FILT_LEN; k++)
+        sum += pSrc[j + k] * pred_filter[k];
+      pTmp[j] = sum;
+    }
+
+    pSrc += src_stride;
+    pTmp += width;
+  }
+
+  // Vertical
+  pTmp = Temp;
+  for (i = 0; i < width; i++) {
+    unsigned char *pDst = dst + i;
+    for (j = 0; j < height; j++) {
+      int sum = 0;
+      for (k = 0; k < PRED_FILT_LEN; k++)
+        sum += pTmp[(j + k) * width] * pred_filter[k];
+      // Round
+      sum = (sum + ((1 << (filt_shift << 1)) >> 1)) >> (filt_shift << 1);
+      pDst[j * dst_stride] = (sum < 0 ? 0 : sum > 255 ? 255 : sum);
+    }
+    ++pTmp;
+  }
+}
+#else
+// Based on vp9_post_proc_down_and_across_c (vp9_postproc.c)
+void filter_mb(unsigned char *src, int src_stride,
+               unsigned char *dst, int dst_stride,
+               int width, int height) {
+  unsigned char *pSrc, *pDst;
+  int row;
+  int col;
+  int i;
+  int v;
+  unsigned char d[8];
+
+  /* TODO flimit should be linked to the quantizer value */
+  int flimit = 7;
+
+  for (row = 0; row < height; row++) {
+    /* post_proc_down for one row */
+    pSrc = src;
+    pDst = dst;
+
+    for (col = 0; col < width; col++) {
+      int kernel = (1 << (filt_shift - 1));
+      int v = pSrc[col];
+
+      for (i = -2; i <= 2; i++) {
+        if (abs(v - pSrc[col + i * src_stride]) > flimit)
+          goto down_skip_convolve;
+
+        kernel += pred_filter[2 + i] * pSrc[col + i * src_stride];
+      }
+
+      v = (kernel >> filt_shift);
+    down_skip_convolve:
+      pDst[col] = v;
+    }
+
+    /* now post_proc_across */
+    pSrc = dst;
+    pDst = dst;
+
+    for (i = 0; i < 8; i++)
+      d[i] = pSrc[i];
+
+    for (col = 0; col < width; col++) {
+      int kernel = (1 << (filt_shift - 1));
+      v = pSrc[col];
+
+      d[col & 7] = v;
+
+      for (i = -2; i <= 2; i++) {
+        if (abs(v - pSrc[col + i]) > flimit)
+          goto across_skip_convolve;
+
+        kernel += pred_filter[2 + i] * pSrc[col + i];
+      }
+
+      d[col & 7] = (kernel >> filt_shift);
+    across_skip_convolve:
+
+      if (col >= 2)
+        pDst[col - 2] = d[(col - 2) & 7];
+    }
+
+    /* handle the last two pixels */
+    pDst[col - 2] = d[(col - 2) & 7];
+    pDst[col - 1] = d[(col - 1) & 7];
+
+    /* next row */
+    src += src_stride;
+    dst += dst_stride;
+  }
+}
+#endif  // !USE_THRESH_FILTER
+
+#endif  // CONFIG_PRED_FILTER
+
+/*encoder only*/
+void vp9_build_inter4x4_predictors_mbuv(MACROBLOCKD *xd) {
+  int i, j;
+  BLOCKD *blockd = xd->block;
+
+  /* build uv mvs */
+  for (i = 0; i < 2; i++) {
+    for (j = 0; j < 2; j++) {
+      int yoffset = i * 8 + j * 2;
+      int uoffset = 16 + i * 2 + j;
+      int voffset = 20 + i * 2 + j;
+      int temp;
+
+      temp = blockd[yoffset  ].bmi.as_mv.first.as_mv.row
+             + blockd[yoffset + 1].bmi.as_mv.first.as_mv.row
+             + blockd[yoffset + 4].bmi.as_mv.first.as_mv.row
+             + blockd[yoffset + 5].bmi.as_mv.first.as_mv.row;
+
+      if (temp < 0) temp -= 4;
+      else temp += 4;
+
+      xd->block[uoffset].bmi.as_mv.first.as_mv.row = (temp / 8) &
+        xd->fullpixel_mask;
+
+      temp = blockd[yoffset  ].bmi.as_mv.first.as_mv.col
+             + blockd[yoffset + 1].bmi.as_mv.first.as_mv.col
+             + blockd[yoffset + 4].bmi.as_mv.first.as_mv.col
+             + blockd[yoffset + 5].bmi.as_mv.first.as_mv.col;
+
+      if (temp < 0) temp -= 4;
+      else temp += 4;
+
+      blockd[uoffset].bmi.as_mv.first.as_mv.col = (temp / 8) &
+        xd->fullpixel_mask;
+
+      blockd[voffset].bmi.as_mv.first.as_mv.row =
+        blockd[uoffset].bmi.as_mv.first.as_mv.row;
+      blockd[voffset].bmi.as_mv.first.as_mv.col =
+        blockd[uoffset].bmi.as_mv.first.as_mv.col;
+
+      if (xd->mode_info_context->mbmi.second_ref_frame > 0) {
+        temp = blockd[yoffset  ].bmi.as_mv.second.as_mv.row
+               + blockd[yoffset + 1].bmi.as_mv.second.as_mv.row
+               + blockd[yoffset + 4].bmi.as_mv.second.as_mv.row
+               + blockd[yoffset + 5].bmi.as_mv.second.as_mv.row;
+
+        if (temp < 0) {
+          temp -= 4;
+        } else {
+          temp += 4;
+        }
+
+        blockd[uoffset].bmi.as_mv.second.as_mv.row = (temp / 8) &
+          xd->fullpixel_mask;
+
+        temp = blockd[yoffset  ].bmi.as_mv.second.as_mv.col
+               + blockd[yoffset + 1].bmi.as_mv.second.as_mv.col
+               + blockd[yoffset + 4].bmi.as_mv.second.as_mv.col
+               + blockd[yoffset + 5].bmi.as_mv.second.as_mv.col;
+
+        if (temp < 0) {
+          temp -= 4;
+        } else {
+          temp += 4;
+        }
+
+        blockd[uoffset].bmi.as_mv.second.as_mv.col = (temp / 8) &
+          xd->fullpixel_mask;
+
+        blockd[voffset].bmi.as_mv.second.as_mv.row =
+          blockd[uoffset].bmi.as_mv.second.as_mv.row;
+        blockd[voffset].bmi.as_mv.second.as_mv.col =
+          blockd[uoffset].bmi.as_mv.second.as_mv.col;
+      }
+    }
+  }
+
+  for (i = 16; i < 24; i += 2) {
+    BLOCKD *d0 = &blockd[i];
+    BLOCKD *d1 = &blockd[i + 1];
+
+    if (d0->bmi.as_mv.first.as_int == d1->bmi.as_mv.first.as_int)
+      build_inter_predictors2b(xd, d0, 8);
+    else {
+      vp9_build_inter_predictors_b(d0, 8, xd->subpixel_predict);
+      vp9_build_inter_predictors_b(d1, 8, xd->subpixel_predict);
+    }
+
+    if (xd->mode_info_context->mbmi.second_ref_frame > 0) {
+      vp9_build_2nd_inter_predictors_b(d0, 8, xd->subpixel_predict_avg);
+      vp9_build_2nd_inter_predictors_b(d1, 8, xd->subpixel_predict_avg);
+    }
+  }
+}
+
+static void clamp_mv_to_umv_border(MV *mv, const MACROBLOCKD *xd) {
+  /* If the MV points so far into the UMV border that no visible pixels
+   * are used for reconstruction, the subpel part of the MV can be
+   * discarded and the MV limited to 16 pixels with equivalent results.
+   *
+   * This limit kicks in at 19 pixels for the top and left edges, for
+   * the 16 pixels plus 3 taps right of the central pixel when subpel
+   * filtering. The bottom and right edges use 16 pixels plus 2 pixels
+   * left of the central pixel when filtering.
+   */
+  if (mv->col < (xd->mb_to_left_edge - ((16 + VP9_INTERP_EXTEND) << 3)))
+    mv->col = xd->mb_to_left_edge - (16 << 3);
+  else if (mv->col > xd->mb_to_right_edge + ((15 + VP9_INTERP_EXTEND) << 3))
+    mv->col = xd->mb_to_right_edge + (16 << 3);
+
+  if (mv->row < (xd->mb_to_top_edge - ((16 + VP9_INTERP_EXTEND) << 3)))
+    mv->row = xd->mb_to_top_edge - (16 << 3);
+  else if (mv->row > xd->mb_to_bottom_edge + ((15 + VP9_INTERP_EXTEND) << 3))
+    mv->row = xd->mb_to_bottom_edge + (16 << 3);
+}
+
+/* A version of the above function for chroma block MVs.*/
+static void clamp_uvmv_to_umv_border(MV *mv, const MACROBLOCKD *xd) {
+  const int extend = VP9_INTERP_EXTEND;
+
+  mv->col = (2 * mv->col < (xd->mb_to_left_edge - ((16 + extend) << 3))) ?
+            (xd->mb_to_left_edge - (16 << 3)) >> 1 : mv->col;
+  mv->col = (2 * mv->col > xd->mb_to_right_edge + ((15 + extend) << 3)) ?
+            (xd->mb_to_right_edge + (16 << 3)) >> 1 : mv->col;
+
+  mv->row = (2 * mv->row < (xd->mb_to_top_edge - ((16 + extend) << 3))) ?
+            (xd->mb_to_top_edge - (16 << 3)) >> 1 : mv->row;
+  mv->row = (2 * mv->row > xd->mb_to_bottom_edge + ((15 + extend) << 3)) ?
+            (xd->mb_to_bottom_edge + (16 << 3)) >> 1 : mv->row;
+}
+
+/*encoder only*/
+void vp9_build_1st_inter16x16_predictors_mby(MACROBLOCKD *xd,
+                                             unsigned char *dst_y,
+                                             int dst_ystride,
+                                             int clamp_mvs) {
+  unsigned char *ptr_base = xd->pre.y_buffer;
+  unsigned char *ptr;
+  int pre_stride = xd->block[0].pre_stride;
+  int_mv ymv;
+
+  ymv.as_int = xd->mode_info_context->mbmi.mv[0].as_int;
+
+  if (clamp_mvs)
+    clamp_mv_to_umv_border(&ymv.as_mv, xd);
+
+  ptr = ptr_base + (ymv.as_mv.row >> 3) * pre_stride + (ymv.as_mv.col >> 3);
+
+#if CONFIG_PRED_FILTER
+  if (xd->mode_info_context->mbmi.pred_filter_enabled) {
+    if ((ymv.as_mv.row | ymv.as_mv.col) & 7) {
+      // Sub-pel filter needs extended input
+      int len = 15 + (VP9_INTERP_EXTEND << 1);
+      unsigned char Temp[32 * 32]; // Data required by sub-pel filter
+      unsigned char *pTemp = Temp + (VP9_INTERP_EXTEND - 1) * (len + 1);
+
+      // Copy extended MB into Temp array, applying the spatial filter
+      filter_mb(ptr - (VP9_INTERP_EXTEND - 1) * (pre_stride + 1), pre_stride,
+                Temp, len, len, len);
+
+      // Sub-pel interpolation
+      xd->subpixel_predict16x16(pTemp, len,
+                                (ymv.as_mv.col & 7) << 1,
+                                (ymv.as_mv.row & 7) << 1,
+                                dst_y, dst_ystride);
+    } else {
+      // Apply spatial filter to create the prediction directly
+      filter_mb(ptr, pre_stride, dst_y, dst_ystride, 16, 16);
+    }
+  } else
+#endif
+    if ((ymv.as_mv.row | ymv.as_mv.col) & 7) {
+      xd->subpixel_predict16x16(ptr, pre_stride,
+                                (ymv.as_mv.col & 7) << 1,
+                                (ymv.as_mv.row & 7) << 1,
+                                dst_y, dst_ystride);
+    } else {
+      vp9_copy_mem16x16(ptr, pre_stride, dst_y, dst_ystride);
+    }
+}
+
+void vp9_build_1st_inter16x16_predictors_mbuv(MACROBLOCKD *xd,
+                                              unsigned char *dst_u,
+                                              unsigned char *dst_v,
+                                              int dst_uvstride) {
+  int offset;
+  unsigned char *uptr, *vptr;
+  int pre_stride = xd->block[0].pre_stride;
+  int_mv _o16x16mv;
+  int_mv _16x16mv;
+
+  _16x16mv.as_int = xd->mode_info_context->mbmi.mv[0].as_int;
+
+  if (xd->mode_info_context->mbmi.need_to_clamp_mvs)
+    clamp_mv_to_umv_border(&_16x16mv.as_mv, xd);
+
+  _o16x16mv = _16x16mv;
+  /* calc uv motion vectors */
+  if (_16x16mv.as_mv.row < 0)
+    _16x16mv.as_mv.row -= 1;
+  else
+    _16x16mv.as_mv.row += 1;
+
+  if (_16x16mv.as_mv.col < 0)
+    _16x16mv.as_mv.col -= 1;
+  else
+    _16x16mv.as_mv.col += 1;
+
+  _16x16mv.as_mv.row /= 2;
+  _16x16mv.as_mv.col /= 2;
+
+  _16x16mv.as_mv.row &= xd->fullpixel_mask;
+  _16x16mv.as_mv.col &= xd->fullpixel_mask;
+
+  pre_stride >>= 1;
+  offset = (_16x16mv.as_mv.row >> 3) * pre_stride + (_16x16mv.as_mv.col >> 3);
+  uptr = xd->pre.u_buffer + offset;
+  vptr = xd->pre.v_buffer + offset;
+
+#if CONFIG_PRED_FILTER
+  if (xd->mode_info_context->mbmi.pred_filter_enabled) {
+    int i;
+    unsigned char *pSrc = uptr;
+    unsigned char *pDst = dst_u;
+    int len = 7 + (VP9_INTERP_EXTEND << 1);
+    unsigned char Temp[32 * 32]; // Data required by the sub-pel filter
+    unsigned char *pTemp = Temp + (VP9_INTERP_EXTEND - 1) * (len + 1);
+
+    // U & V
+    for (i = 0; i < 2; i++) {
+      if (_o16x16mv.as_int & 0x000f000f) {
+        // Copy extended MB into Temp array, applying the spatial filter
+        filter_mb(pSrc - (VP9_INTERP_EXTEND - 1) * (pre_stride + 1), pre_stride,
+                  Temp, len, len, len);
+
+        // Sub-pel filter
+        xd->subpixel_predict8x8(pTemp, len,
+                                _o16x16mv.as_mv.col & 15,
+                                _o16x16mv.as_mv.row & 15,
+                                pDst, dst_uvstride);
+      } else {
+        filter_mb(pSrc, pre_stride, pDst, dst_uvstride, 8, 8);
+      }
+
+      // V
+      pSrc = vptr;
+      pDst = dst_v;
+    }
+  } else
+#endif
+    if (_o16x16mv.as_int & 0x000f000f) {
+      xd->subpixel_predict8x8(uptr, pre_stride, _o16x16mv.as_mv.col & 15,
+                              _o16x16mv.as_mv.row & 15, dst_u, dst_uvstride);
+      xd->subpixel_predict8x8(vptr, pre_stride, _o16x16mv.as_mv.col & 15,
+                              _o16x16mv.as_mv.row & 15, dst_v, dst_uvstride);
+    } else {
+      vp9_copy_mem8x8(uptr, pre_stride, dst_u, dst_uvstride);
+      vp9_copy_mem8x8(vptr, pre_stride, dst_v, dst_uvstride);
+    }
+}
+
+
+void vp9_build_1st_inter16x16_predictors_mb(MACROBLOCKD *xd,
+                                            unsigned char *dst_y,
+                                            unsigned char *dst_u,
+                                            unsigned char *dst_v,
+                                            int dst_ystride, int dst_uvstride) {
+  vp9_build_1st_inter16x16_predictors_mby(xd, dst_y, dst_ystride,
+      xd->mode_info_context->mbmi.need_to_clamp_mvs);
+  vp9_build_1st_inter16x16_predictors_mbuv(xd, dst_u, dst_v, dst_uvstride);
+}
+
+#if CONFIG_SUPERBLOCKS
+void vp9_build_inter32x32_predictors_sb(MACROBLOCKD *x,
+                                        unsigned char *dst_y,
+                                        unsigned char *dst_u,
+                                        unsigned char *dst_v,
+                                        int dst_ystride,
+                                        int dst_uvstride) {
+  uint8_t *y1 = x->pre.y_buffer, *u1 = x->pre.u_buffer, *v1 = x->pre.v_buffer;
+  uint8_t *y2 = x->second_pre.y_buffer, *u2 = x->second_pre.u_buffer,
+          *v2 = x->second_pre.v_buffer;
+  int edge[4], n;
+
+  edge[0] = x->mb_to_top_edge;
+  edge[1] = x->mb_to_bottom_edge;
+  edge[2] = x->mb_to_left_edge;
+  edge[3] = x->mb_to_right_edge;
+
+  for (n = 0; n < 4; n++) {
+    const int x_idx = n & 1, y_idx = n >> 1;
+
+    x->mb_to_top_edge    = edge[0] -      ((y_idx  * 16) << 3);
+    x->mb_to_bottom_edge = edge[1] + (((1 - y_idx) * 16) << 3);
+    x->mb_to_left_edge   = edge[2] -      ((x_idx  * 16) << 3);
+    x->mb_to_right_edge  = edge[3] + (((1 - x_idx) * 16) << 3);
+
+    x->pre.y_buffer = y1 + y_idx * 16 * x->pre.y_stride  + x_idx * 16;
+    x->pre.u_buffer = u1 + y_idx *  8 * x->pre.uv_stride + x_idx *  8;
+    x->pre.v_buffer = v1 + y_idx *  8 * x->pre.uv_stride + x_idx *  8;
+
+    vp9_build_1st_inter16x16_predictors_mb(x,
+      dst_y + y_idx * 16 * dst_ystride  + x_idx * 16,
+      dst_u + y_idx *  8 * dst_uvstride + x_idx *  8,
+      dst_v + y_idx *  8 * dst_uvstride + x_idx *  8,
+      dst_ystride, dst_uvstride);
+    if (x->mode_info_context->mbmi.second_ref_frame > 0) {
+      x->second_pre.y_buffer = y2 + y_idx * 16 * x->pre.y_stride  + x_idx * 16;
+      x->second_pre.u_buffer = u2 + y_idx *  8 * x->pre.uv_stride + x_idx *  8;
+      x->second_pre.v_buffer = v2 + y_idx *  8 * x->pre.uv_stride + x_idx *  8;
+
+      vp9_build_2nd_inter16x16_predictors_mb(x,
+        dst_y + y_idx * 16 * dst_ystride  + x_idx * 16,
+        dst_u + y_idx *  8 * dst_uvstride + x_idx *  8,
+        dst_v + y_idx *  8 * dst_uvstride + x_idx *  8,
+        dst_ystride, dst_uvstride);
+    }
+  }
+
+  x->mb_to_top_edge    = edge[0];
+  x->mb_to_bottom_edge = edge[1];
+  x->mb_to_left_edge   = edge[2];
+  x->mb_to_right_edge  = edge[3];
+
+  x->pre.y_buffer = y1;
+  x->pre.u_buffer = u1;
+  x->pre.v_buffer = v1;
+
+  if (x->mode_info_context->mbmi.second_ref_frame > 0) {
+    x->second_pre.y_buffer = y2;
+    x->second_pre.u_buffer = u2;
+    x->second_pre.v_buffer = v2;
+  }
+
+#if CONFIG_COMP_INTERINTRA_PRED
+  if (x->mode_info_context->mbmi.second_ref_frame == INTRA_FRAME) {
+    vp9_build_interintra_32x32_predictors_sb(
+        x, dst_y, dst_u, dst_v, dst_ystride, dst_uvstride);
+  }
+#endif
+}
+#endif
+
+/*
+ * The following functions should be called after an initial
+ * call to vp9_build_1st_inter16x16_predictors_mb() or _mby()/_mbuv().
+ * It will run a second sixtap filter on a (different) ref
+ * frame and average the result with the output of the
+ * first sixtap filter. The second reference frame is stored
+ * in x->second_pre (the reference frame index is in
+ * x->mode_info_context->mbmi.second_ref_frame). The second
+ * motion vector is x->mode_info_context->mbmi.second_mv.
+ *
+ * This allows blending prediction from two reference frames
+ * which sometimes leads to better prediction than from a
+ * single reference framer.
+ */
+void vp9_build_2nd_inter16x16_predictors_mby(MACROBLOCKD *xd,
+                                             unsigned char *dst_y,
+                                             int dst_ystride) {
+  unsigned char *ptr;
+
+  int_mv _16x16mv;
+  int mv_row;
+  int mv_col;
+
+  unsigned char *ptr_base = xd->second_pre.y_buffer;
+  int pre_stride = xd->block[0].pre_stride;
+
+  _16x16mv.as_int = xd->mode_info_context->mbmi.mv[1].as_int;
+
+  if (xd->mode_info_context->mbmi.need_to_clamp_secondmv)
+    clamp_mv_to_umv_border(&_16x16mv.as_mv, xd);
+
+  mv_row = _16x16mv.as_mv.row;
+  mv_col = _16x16mv.as_mv.col;
+
+  ptr = ptr_base + (mv_row >> 3) * pre_stride + (mv_col >> 3);
+
+#if CONFIG_PRED_FILTER
+  if (xd->mode_info_context->mbmi.pred_filter_enabled) {
+    if ((mv_row | mv_col) & 7) {
+      // Sub-pel filter needs extended input
+      int len = 15 + (VP9_INTERP_EXTEND << 1);
+      unsigned char Temp[32 * 32]; // Data required by sub-pel filter
+      unsigned char *pTemp = Temp + (VP9_INTERP_EXTEND - 1) * (len + 1);
+
+      // Copy extended MB into Temp array, applying the spatial filter
+      filter_mb(ptr - (VP9_INTERP_EXTEND - 1) * (pre_stride + 1), pre_stride,
+                Temp, len, len, len);
+
+      // Sub-pel filter
+      xd->subpixel_predict_avg16x16(pTemp, len, (mv_col & 7) << 1,
+                                    (mv_row & 7) << 1, dst_y, dst_ystride);
+    } else {
+      // TODO Needs to AVERAGE with the dst_y
+      // For now, do not apply the prediction filter in these cases!
+      vp9_avg_mem16x16(ptr, pre_stride, dst_y, dst_ystride);
+    }
+  } else
+#endif  // CONFIG_PRED_FILTER
+  {
+    if ((mv_row | mv_col) & 7) {
+      xd->subpixel_predict_avg16x16(ptr, pre_stride, (mv_col & 7) << 1,
+                                    (mv_row & 7) << 1, dst_y, dst_ystride);
+    } else {
+      vp9_avg_mem16x16(ptr, pre_stride, dst_y, dst_ystride);
+    }
+  }
+}
+
+void vp9_build_2nd_inter16x16_predictors_mbuv(MACROBLOCKD *xd,
+                                              unsigned char *dst_u,
+                                              unsigned char *dst_v,
+                                              int dst_uvstride) {
+  int offset;
+  unsigned char *uptr, *vptr;
+
+  int_mv _16x16mv;
+  int mv_row;
+  int mv_col;
+  int omv_row, omv_col;
+
+  int pre_stride = xd->block[0].pre_stride;
+
+  _16x16mv.as_int = xd->mode_info_context->mbmi.mv[1].as_int;
+
+  if (xd->mode_info_context->mbmi.need_to_clamp_secondmv)
+    clamp_mv_to_umv_border(&_16x16mv.as_mv, xd);
+
+  mv_row = _16x16mv.as_mv.row;
+  mv_col = _16x16mv.as_mv.col;
+
+  /* calc uv motion vectors */
+  omv_row = mv_row;
+  omv_col = mv_col;
+  mv_row = (mv_row + (mv_row > 0)) >> 1;
+  mv_col = (mv_col + (mv_col > 0)) >> 1;
+
+  mv_row &= xd->fullpixel_mask;
+  mv_col &= xd->fullpixel_mask;
+
+  pre_stride >>= 1;
+  offset = (mv_row >> 3) * pre_stride + (mv_col >> 3);
+  uptr = xd->second_pre.u_buffer + offset;
+  vptr = xd->second_pre.v_buffer + offset;
+
+#if CONFIG_PRED_FILTER
+  if (xd->mode_info_context->mbmi.pred_filter_enabled) {
+    int i;
+    int len = 7 + (VP9_INTERP_EXTEND << 1);
+    unsigned char Temp[32 * 32]; // Data required by sub-pel filter
+    unsigned char *pTemp = Temp + (VP9_INTERP_EXTEND - 1) * (len + 1);
+    unsigned char *pSrc = uptr;
+    unsigned char *pDst = dst_u;
+
+    // U & V
+    for (i = 0; i < 2; i++) {
+      if ((omv_row | omv_col) & 15) {
+        // Copy extended MB into Temp array, applying the spatial filter
+        filter_mb(pSrc - (VP9_INTERP_EXTEND - 1) * (pre_stride + 1), pre_stride,
+                  Temp, len, len, len);
+
+        // Sub-pel filter
+        xd->subpixel_predict_avg8x8(pTemp, len, omv_col & 15,
+                                    omv_row & 15, pDst, dst_uvstride);
+      } else {
+        // TODO Needs to AVERAGE with the dst_[u|v]
+        // For now, do not apply the prediction filter here!
+        vp9_avg_mem8x8(pSrc, pre_stride, pDst, dst_uvstride);
+      }
+
+      // V
+      pSrc = vptr;
+      pDst = dst_v;
+    }
+  } else
+#endif  // CONFIG_PRED_FILTER
+    if ((omv_row | omv_col) & 15) {
+      xd->subpixel_predict_avg8x8(uptr, pre_stride, omv_col & 15,
+                                  omv_row & 15, dst_u, dst_uvstride);
+      xd->subpixel_predict_avg8x8(vptr, pre_stride, omv_col & 15,
+                                  omv_row & 15, dst_v, dst_uvstride);
+    } else {
+      vp9_avg_mem8x8(uptr, pre_stride, dst_u, dst_uvstride);
+      vp9_avg_mem8x8(vptr, pre_stride, dst_v, dst_uvstride);
+    }
+}
+
+void vp9_build_2nd_inter16x16_predictors_mb(MACROBLOCKD *xd,
+                                            unsigned char *dst_y,
+                                            unsigned char *dst_u,
+                                            unsigned char *dst_v,
+                                            int dst_ystride,
+                                            int dst_uvstride) {
+  vp9_build_2nd_inter16x16_predictors_mby(xd, dst_y, dst_ystride);
+  vp9_build_2nd_inter16x16_predictors_mbuv(xd, dst_u, dst_v, dst_uvstride);
+}
+
+static void build_inter4x4_predictors_mb(MACROBLOCKD *xd) {
+  int i;
+  MB_MODE_INFO * mbmi = &xd->mode_info_context->mbmi;
+  BLOCKD *blockd = xd->block;
+
+  if (xd->mode_info_context->mbmi.partitioning != PARTITIONING_4X4) {
+    blockd[ 0].bmi = xd->mode_info_context->bmi[ 0];
+    blockd[ 2].bmi = xd->mode_info_context->bmi[ 2];
+    blockd[ 8].bmi = xd->mode_info_context->bmi[ 8];
+    blockd[10].bmi = xd->mode_info_context->bmi[10];
+
+    if (mbmi->need_to_clamp_mvs) {
+      clamp_mv_to_umv_border(&blockd[ 0].bmi.as_mv.first.as_mv, xd);
+      clamp_mv_to_umv_border(&blockd[ 2].bmi.as_mv.first.as_mv, xd);
+      clamp_mv_to_umv_border(&blockd[ 8].bmi.as_mv.first.as_mv, xd);
+      clamp_mv_to_umv_border(&blockd[10].bmi.as_mv.first.as_mv, xd);
+      if (mbmi->second_ref_frame > 0) {
+        clamp_mv_to_umv_border(&blockd[ 0].bmi.as_mv.second.as_mv, xd);
+        clamp_mv_to_umv_border(&blockd[ 2].bmi.as_mv.second.as_mv, xd);
+        clamp_mv_to_umv_border(&blockd[ 8].bmi.as_mv.second.as_mv, xd);
+        clamp_mv_to_umv_border(&blockd[10].bmi.as_mv.second.as_mv, xd);
+      }
+    }
+
+
+    vp9_build_inter_predictors4b(xd, &blockd[ 0], 16);
+    vp9_build_inter_predictors4b(xd, &blockd[ 2], 16);
+    vp9_build_inter_predictors4b(xd, &blockd[ 8], 16);
+    vp9_build_inter_predictors4b(xd, &blockd[10], 16);
+
+    if (mbmi->second_ref_frame > 0) {
+      vp9_build_2nd_inter_predictors4b(xd, &blockd[ 0], 16);
+      vp9_build_2nd_inter_predictors4b(xd, &blockd[ 2], 16);
+      vp9_build_2nd_inter_predictors4b(xd, &blockd[ 8], 16);
+      vp9_build_2nd_inter_predictors4b(xd, &blockd[10], 16);
+    }
+  } else {
+    for (i = 0; i < 16; i += 2) {
+      BLOCKD *d0 = &blockd[i];
+      BLOCKD *d1 = &blockd[i + 1];
+
+      blockd[i + 0].bmi = xd->mode_info_context->bmi[i + 0];
+      blockd[i + 1].bmi = xd->mode_info_context->bmi[i + 1];
+
+      if (mbmi->need_to_clamp_mvs) {
+        clamp_mv_to_umv_border(&blockd[i + 0].bmi.as_mv.first.as_mv, xd);
+        clamp_mv_to_umv_border(&blockd[i + 1].bmi.as_mv.first.as_mv, xd);
+        if (mbmi->second_ref_frame > 0) {
+          clamp_mv_to_umv_border(&blockd[i + 0].bmi.as_mv.second.as_mv, xd);
+          clamp_mv_to_umv_border(&blockd[i + 1].bmi.as_mv.second.as_mv, xd);
+        }
+      }
+
+      if (d0->bmi.as_mv.first.as_int == d1->bmi.as_mv.first.as_int)
+        build_inter_predictors2b(xd, d0, 16);
+      else {
+        vp9_build_inter_predictors_b(d0, 16, xd->subpixel_predict);
+        vp9_build_inter_predictors_b(d1, 16, xd->subpixel_predict);
+      }
+
+      if (mbmi->second_ref_frame > 0) {
+        vp9_build_2nd_inter_predictors_b(d0, 16, xd->subpixel_predict_avg);
+        vp9_build_2nd_inter_predictors_b(d1, 16, xd->subpixel_predict_avg);
+      }
+    }
+  }
+
+  for (i = 16; i < 24; i += 2) {
+    BLOCKD *d0 = &blockd[i];
+    BLOCKD *d1 = &blockd[i + 1];
+
+    if (d0->bmi.as_mv.first.as_int == d1->bmi.as_mv.first.as_int)
+      build_inter_predictors2b(xd, d0, 8);
+    else {
+      vp9_build_inter_predictors_b(d0, 8, xd->subpixel_predict);
+      vp9_build_inter_predictors_b(d1, 8, xd->subpixel_predict);
+    }
+
+    if (mbmi->second_ref_frame > 0) {
+      vp9_build_2nd_inter_predictors_b(d0, 8, xd->subpixel_predict_avg);
+      vp9_build_2nd_inter_predictors_b(d1, 8, xd->subpixel_predict_avg);
+    }
+  }
+}
+
+static
+void build_4x4uvmvs(MACROBLOCKD *xd) {
+  int i, j;
+  BLOCKD *blockd = xd->block;
+
+  for (i = 0; i < 2; i++) {
+    for (j = 0; j < 2; j++) {
+      int yoffset = i * 8 + j * 2;
+      int uoffset = 16 + i * 2 + j;
+      int voffset = 20 + i * 2 + j;
+
+      int temp;
+
+      temp = xd->mode_info_context->bmi[yoffset + 0].as_mv.first.as_mv.row
+             + xd->mode_info_context->bmi[yoffset + 1].as_mv.first.as_mv.row
+             + xd->mode_info_context->bmi[yoffset + 4].as_mv.first.as_mv.row
+             + xd->mode_info_context->bmi[yoffset + 5].as_mv.first.as_mv.row;
+
+      if (temp < 0) temp -= 4;
+      else temp += 4;
+
+      blockd[uoffset].bmi.as_mv.first.as_mv.row = (temp / 8) &
+                                                  xd->fullpixel_mask;
+
+      temp = xd->mode_info_context->bmi[yoffset + 0].as_mv.first.as_mv.col
+             + xd->mode_info_context->bmi[yoffset + 1].as_mv.first.as_mv.col
+             + xd->mode_info_context->bmi[yoffset + 4].as_mv.first.as_mv.col
+             + xd->mode_info_context->bmi[yoffset + 5].as_mv.first.as_mv.col;
+
+      if (temp < 0) temp -= 4;
+      else temp += 4;
+
+      blockd[uoffset].bmi.as_mv.first.as_mv.col = (temp / 8) &
+        xd->fullpixel_mask;
+
+      // if (x->mode_info_context->mbmi.need_to_clamp_mvs)
+      clamp_uvmv_to_umv_border(&blockd[uoffset].bmi.as_mv.first.as_mv, xd);
+
+      // if (x->mode_info_context->mbmi.need_to_clamp_mvs)
+      clamp_uvmv_to_umv_border(&blockd[uoffset].bmi.as_mv.first.as_mv, xd);
+
+      blockd[voffset].bmi.as_mv.first.as_mv.row =
+        blockd[uoffset].bmi.as_mv.first.as_mv.row;
+      blockd[voffset].bmi.as_mv.first.as_mv.col =
+        blockd[uoffset].bmi.as_mv.first.as_mv.col;
+
+      if (xd->mode_info_context->mbmi.second_ref_frame > 0) {
+        temp = xd->mode_info_context->bmi[yoffset + 0].as_mv.second.as_mv.row
+               + xd->mode_info_context->bmi[yoffset + 1].as_mv.second.as_mv.row
+               + xd->mode_info_context->bmi[yoffset + 4].as_mv.second.as_mv.row
+               + xd->mode_info_context->bmi[yoffset + 5].as_mv.second.as_mv.row;
+
+        if (temp < 0) {
+          temp -= 4;
+        } else {
+          temp += 4;
+        }
+
+       blockd[uoffset].bmi.as_mv.second.as_mv.row = (temp / 8) &
+                                                    xd->fullpixel_mask;
+
+        temp = xd->mode_info_context->bmi[yoffset + 0].as_mv.second.as_mv.col
+               + xd->mode_info_context->bmi[yoffset + 1].as_mv.second.as_mv.col
+               + xd->mode_info_context->bmi[yoffset + 4].as_mv.second.as_mv.col
+               + xd->mode_info_context->bmi[yoffset + 5].as_mv.second.as_mv.col;
+
+        if (temp < 0) {
+          temp -= 4;
+        } else {
+          temp += 4;
+        }
+
+        blockd[uoffset].bmi.as_mv.second.as_mv.col = (temp / 8) &
+                                                        xd->fullpixel_mask;
+
+        // if (mbmi->need_to_clamp_mvs)
+        clamp_uvmv_to_umv_border(
+          &blockd[uoffset].bmi.as_mv.second.as_mv, xd);
+
+        // if (mbmi->need_to_clamp_mvs)
+        clamp_uvmv_to_umv_border(
+          &blockd[uoffset].bmi.as_mv.second.as_mv, xd);
+
+        blockd[voffset].bmi.as_mv.second.as_mv.row =
+          blockd[uoffset].bmi.as_mv.second.as_mv.row;
+        blockd[voffset].bmi.as_mv.second.as_mv.col =
+          blockd[uoffset].bmi.as_mv.second.as_mv.col;
+      }
+    }
+  }
+}
+
+void vp9_build_inter_predictors_mb(MACROBLOCKD *xd) {
+  if (xd->mode_info_context->mbmi.mode != SPLITMV) {
+    vp9_build_1st_inter16x16_predictors_mb(xd, xd->predictor,
+                                           &xd->predictor[256],
+                                           &xd->predictor[320], 16, 8);
+
+    if (xd->mode_info_context->mbmi.second_ref_frame > 0) {
+      /* 256 = offset of U plane in Y+U+V buffer;
+       * 320 = offset of V plane in Y+U+V buffer.
+       * (256=16x16, 320=16x16+8x8). */
+      vp9_build_2nd_inter16x16_predictors_mb(xd, xd->predictor,
+                                             &xd->predictor[256],
+                                             &xd->predictor[320], 16, 8);
+    }
+#if CONFIG_COMP_INTERINTRA_PRED
+    else if (xd->mode_info_context->mbmi.second_ref_frame == INTRA_FRAME) {
+      vp9_build_interintra_16x16_predictors_mb(xd, xd->predictor,
+                                               &xd->predictor[256],
+                                               &xd->predictor[320], 16, 8);
+    }
+#endif
+  } else {
+    build_4x4uvmvs(xd);
+    build_inter4x4_predictors_mb(xd);
+  }
+}