libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_findnearmv.h

+/*
+ *  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.
+ */
+
+
+#ifndef VP9_COMMON_VP9_FINDNEARMV_H_
+#define VP9_COMMON_VP9_FINDNEARMV_H_
+
+#include "vp9/common/vp9_mv.h"
+#include "vp9/common/vp9_blockd.h"
+#include "vp9/common/vp9_treecoder.h"
+#include "vp9/common/vp9_onyxc_int.h"
+
+/* check a list of motion vectors by sad score using a number rows of pixels
+ * above and a number cols of pixels in the left to select the one with best
+ * score to use as ref motion vector
+ */
+void vp9_find_best_ref_mvs(MACROBLOCKD *xd,
+                           unsigned char *ref_y_buffer,
+                           int ref_y_stride,
+                           int_mv *mvlist,
+                           int_mv *best_mv,
+                           int_mv *nearest,
+                           int_mv *near);
+
+static void mv_bias(int refmb_ref_frame_sign_bias, int refframe, int_mv *mvp, const int *ref_frame_sign_bias) {
+  MV xmv;
+  xmv = mvp->as_mv;
+
+  if (refmb_ref_frame_sign_bias != ref_frame_sign_bias[refframe]) {
+    xmv.row *= -1;
+    xmv.col *= -1;
+  }
+
+  mvp->as_mv = xmv;
+}
+
+#define LEFT_TOP_MARGIN (16 << 3)
+#define RIGHT_BOTTOM_MARGIN (16 << 3)
+
+static void clamp_mv(int_mv *mv,
+                     int mb_to_left_edge,
+                     int mb_to_right_edge,
+                     int mb_to_top_edge,
+                     int mb_to_bottom_edge) {
+  mv->as_mv.col = (mv->as_mv.col < mb_to_left_edge) ?
+                  mb_to_left_edge : mv->as_mv.col;
+  mv->as_mv.col = (mv->as_mv.col > mb_to_right_edge) ?
+                  mb_to_right_edge : mv->as_mv.col;
+  mv->as_mv.row = (mv->as_mv.row < mb_to_top_edge) ?
+                  mb_to_top_edge : mv->as_mv.row;
+  mv->as_mv.row = (mv->as_mv.row > mb_to_bottom_edge) ?
+                  mb_to_bottom_edge : mv->as_mv.row;
+}
+
+static void clamp_mv2(int_mv *mv, const MACROBLOCKD *xd) {
+  clamp_mv(mv,
+           xd->mb_to_left_edge - LEFT_TOP_MARGIN,
+           xd->mb_to_right_edge + RIGHT_BOTTOM_MARGIN,
+           xd->mb_to_top_edge - LEFT_TOP_MARGIN,
+           xd->mb_to_bottom_edge + RIGHT_BOTTOM_MARGIN);
+}
+
+static unsigned int check_mv_bounds(int_mv *mv,
+                                    int mb_to_left_edge,
+                                    int mb_to_right_edge,
+                                    int mb_to_top_edge,
+                                    int mb_to_bottom_edge) {
+  return (mv->as_mv.col < mb_to_left_edge) ||
+         (mv->as_mv.col > mb_to_right_edge) ||
+         (mv->as_mv.row < mb_to_top_edge) ||
+         (mv->as_mv.row > mb_to_bottom_edge);
+}
+
+vp9_prob *vp9_mv_ref_probs(VP9_COMMON *pc,
+                           vp9_prob p[VP9_MVREFS - 1],
+                           const int context);
+
+extern const unsigned char vp9_mbsplit_offset[4][16];
+
+static int left_block_mv(const MODE_INFO *cur_mb, int b) {
+  if (!(b & 3)) {
+    /* On L edge, get from MB to left of us */
+    --cur_mb;
+
+    if (cur_mb->mbmi.mode != SPLITMV)
+      return cur_mb->mbmi.mv[0].as_int;
+    b += 4;
+  }
+
+  return (cur_mb->bmi + b - 1)->as_mv.first.as_int;
+}
+
+static int left_block_second_mv(const MODE_INFO *cur_mb, int b) {
+  if (!(b & 3)) {
+    /* On L edge, get from MB to left of us */
+    --cur_mb;
+
+    if (cur_mb->mbmi.mode != SPLITMV)
+      return cur_mb->mbmi.second_ref_frame > 0 ?
+          cur_mb->mbmi.mv[1].as_int : cur_mb->mbmi.mv[0].as_int;
+    b += 4;
+  }
+
+  return cur_mb->mbmi.second_ref_frame > 0 ?
+      (cur_mb->bmi + b - 1)->as_mv.second.as_int :
+      (cur_mb->bmi + b - 1)->as_mv.first.as_int;
+}
+
+static int above_block_mv(const MODE_INFO *cur_mb, int b, int mi_stride) {
+  if (!(b >> 2)) {
+    /* On top edge, get from MB above us */
+    cur_mb -= mi_stride;
+
+    if (cur_mb->mbmi.mode != SPLITMV)
+      return cur_mb->mbmi.mv[0].as_int;
+    b += 16;
+  }
+
+  return (cur_mb->bmi + b - 4)->as_mv.first.as_int;
+}
+
+static int above_block_second_mv(const MODE_INFO *cur_mb, int b, int mi_stride) {
+  if (!(b >> 2)) {
+    /* On top edge, get from MB above us */
+    cur_mb -= mi_stride;
+
+    if (cur_mb->mbmi.mode != SPLITMV)
+      return cur_mb->mbmi.second_ref_frame > 0 ?
+          cur_mb->mbmi.mv[1].as_int : cur_mb->mbmi.mv[0].as_int;
+    b += 16;
+  }
+
+  return cur_mb->mbmi.second_ref_frame > 0 ?
+      (cur_mb->bmi + b - 4)->as_mv.second.as_int :
+      (cur_mb->bmi + b - 4)->as_mv.first.as_int;
+}
+
+static B_PREDICTION_MODE left_block_mode(const MODE_INFO *cur_mb, int b) {
+  if (!(b & 3)) {
+    /* On L edge, get from MB to left of us */
+    --cur_mb;
+
+    if (cur_mb->mbmi.mode < I8X8_PRED) {
+      return pred_mode_conv(cur_mb->mbmi.mode);
+    } else if (cur_mb->mbmi.mode == I8X8_PRED) {
+      return pred_mode_conv(
+          (MB_PREDICTION_MODE)(cur_mb->bmi + 3 + b)->as_mode.first);
+    } else if (cur_mb->mbmi.mode == B_PRED) {
+      return ((cur_mb->bmi + 3 + b)->as_mode.first);
+    } else {
+      return B_DC_PRED;
+    }
+  }
+  return (cur_mb->bmi + b - 1)->as_mode.first;
+}
+
+static B_PREDICTION_MODE above_block_mode(const MODE_INFO *cur_mb,
+                                          int b, int mi_stride) {
+  if (!(b >> 2)) {
+    /* On top edge, get from MB above us */
+    cur_mb -= mi_stride;
+
+    if (cur_mb->mbmi.mode < I8X8_PRED) {
+      return pred_mode_conv(cur_mb->mbmi.mode);
+    } else if (cur_mb->mbmi.mode == I8X8_PRED) {
+      return pred_mode_conv(
+          (MB_PREDICTION_MODE)(cur_mb->bmi + 12 + b)->as_mode.first);
+    } else if (cur_mb->mbmi.mode == B_PRED) {
+      return ((cur_mb->bmi + 12 + b)->as_mode.first);
+    } else {
+      return B_DC_PRED;
+    }
+  }
+
+  return (cur_mb->bmi + b - 4)->as_mode.first;
+}
+
+#endif