diff -r 000000000000 -r 6474c204b198 media/libvpx/vp9/common/vp9_pred_common.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/libvpx/vp9/common/vp9_pred_common.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,419 @@
+
+/*
+ *  Copyright (c) 2012 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 <limits.h>
+
+#include "vp9/common/vp9_common.h"
+#include "vp9/common/vp9_pred_common.h"
+#include "vp9/common/vp9_seg_common.h"
+#include "vp9/common/vp9_treecoder.h"
+
+static INLINE const MB_MODE_INFO *get_above_mbmi(const MODE_INFO *const above) {
+  return (above != NULL) ? &above->mbmi : NULL;
+}
+
+static INLINE const MB_MODE_INFO *get_left_mbmi(const MODE_INFO *const left) {
+  return (left != NULL) ? &left->mbmi : NULL;
+}
+
+// Returns a context number for the given MB prediction signal
+unsigned char vp9_get_pred_context_switchable_interp(const MACROBLOCKD *xd) {
+  const MODE_INFO *const above_mi = get_above_mi(xd);
+  const MODE_INFO *const left_mi = get_left_mi(xd);
+  const int above_in_image = above_mi != NULL;
+  const int left_in_image = left_mi != NULL;
+  // Note:
+  // The mode info data structure has a one element border above and to the
+  // left of the entries correpsonding to real macroblocks.
+  // The prediction flags in these dummy entries are initialised to 0.
+  // left
+  const int left_mv_pred = left_in_image ? is_inter_block(&left_mi->mbmi)
+                                         : 0;
+  const int left_interp = left_in_image && left_mv_pred
+                              ? left_mi->mbmi.interp_filter
+                              : SWITCHABLE_FILTERS;
+
+  // above
+  const int above_mv_pred = above_in_image ? is_inter_block(&above_mi->mbmi)
+                                           : 0;
+  const int above_interp = above_in_image && above_mv_pred
+                               ? above_mi->mbmi.interp_filter
+                               : SWITCHABLE_FILTERS;
+
+  if (left_interp == above_interp)
+    return left_interp;
+  else if (left_interp == SWITCHABLE_FILTERS &&
+           above_interp != SWITCHABLE_FILTERS)
+    return above_interp;
+  else if (left_interp != SWITCHABLE_FILTERS &&
+           above_interp == SWITCHABLE_FILTERS)
+    return left_interp;
+  else
+    return SWITCHABLE_FILTERS;
+}
+// Returns a context number for the given MB prediction signal
+unsigned char vp9_get_pred_context_intra_inter(const MACROBLOCKD *xd) {
+  const MODE_INFO *const above_mi = get_above_mi(xd);
+  const MODE_INFO *const left_mi = get_left_mi(xd);
+  const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
+  const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
+  const int above_in_image = above_mi != NULL;
+  const int left_in_image = left_mi != NULL;
+  const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
+  const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
+
+  // The mode info data structure has a one element border above and to the
+  // left of the entries corresponding to real macroblocks.
+  // The prediction flags in these dummy entries are initialized to 0.
+  // 0 - inter/inter, inter/--, --/inter, --/--
+  // 1 - intra/inter, inter/intra
+  // 2 - intra/--, --/intra
+  // 3 - intra/intra
+  if (above_in_image && left_in_image)  // both edges available
+    return left_intra && above_intra ? 3
+                                     : left_intra || above_intra;
+  else if (above_in_image || left_in_image)  // one edge available
+    return 2 * (above_in_image ? above_intra : left_intra);
+  else
+    return 0;
+}
+// Returns a context number for the given MB prediction signal
+unsigned char vp9_get_pred_context_comp_inter_inter(const VP9_COMMON *cm,
+                                                    const MACROBLOCKD *xd) {
+  int pred_context;
+  const MODE_INFO *const above_mi = get_above_mi(xd);
+  const MODE_INFO *const left_mi = get_left_mi(xd);
+  const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
+  const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
+  const int above_in_image = above_mi != NULL;
+  const int left_in_image = left_mi != NULL;
+  // Note:
+  // The mode info data structure has a one element border above and to the
+  // left of the entries correpsonding to real macroblocks.
+  // The prediction flags in these dummy entries are initialised to 0.
+  if (above_in_image && left_in_image) {  // both edges available
+    if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi))
+      // neither edge uses comp pred (0/1)
+      pred_context = (above_mbmi->ref_frame[0] == cm->comp_fixed_ref) ^
+                     (left_mbmi->ref_frame[0] == cm->comp_fixed_ref);
+    else if (!has_second_ref(above_mbmi))
+      // one of two edges uses comp pred (2/3)
+      pred_context = 2 + (above_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
+                          !is_inter_block(above_mbmi));
+    else if (!has_second_ref(left_mbmi))
+      // one of two edges uses comp pred (2/3)
+      pred_context = 2 + (left_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
+                          !is_inter_block(left_mbmi));
+    else  // both edges use comp pred (4)
+      pred_context = 4;
+  } else if (above_in_image || left_in_image) {  // one edge available
+    const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
+
+    if (!has_second_ref(edge_mbmi))
+      // edge does not use comp pred (0/1)
+      pred_context = edge_mbmi->ref_frame[0] == cm->comp_fixed_ref;
+    else
+      // edge uses comp pred (3)
+      pred_context = 3;
+  } else {  // no edges available (1)
+    pred_context = 1;
+  }
+  assert(pred_context >= 0 && pred_context < COMP_INTER_CONTEXTS);
+  return pred_context;
+}
+
+// Returns a context number for the given MB prediction signal
+unsigned char vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm,
+                                              const MACROBLOCKD *xd) {
+  int pred_context;
+  const MODE_INFO *const above_mi = get_above_mi(xd);
+  const MODE_INFO *const left_mi = get_left_mi(xd);
+  const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
+  const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
+  const int above_in_image = above_mi != NULL;
+  const int left_in_image = left_mi != NULL;
+  const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
+  const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
+  // Note:
+  // The mode info data structure has a one element border above and to the
+  // left of the entries correpsonding to real macroblocks.
+  // The prediction flags in these dummy entries are initialised to 0.
+  const int fix_ref_idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
+  const int var_ref_idx = !fix_ref_idx;
+
+  if (above_in_image && left_in_image) {  // both edges available
+    if (above_intra && left_intra) {  // intra/intra (2)
+      pred_context = 2;
+    } else if (above_intra || left_intra) {  // intra/inter
+      const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
+
+      if (!has_second_ref(edge_mbmi))  // single pred (1/3)
+        pred_context = 1 + 2 * (edge_mbmi->ref_frame[0] != cm->comp_var_ref[1]);
+      else  // comp pred (1/3)
+        pred_context = 1 + 2 * (edge_mbmi->ref_frame[var_ref_idx]
+                                    != cm->comp_var_ref[1]);
+    } else {  // inter/inter
+      const int l_sg = !has_second_ref(left_mbmi);
+      const int a_sg = !has_second_ref(above_mbmi);
+      MV_REFERENCE_FRAME vrfa = a_sg ? above_mbmi->ref_frame[0]
+                                     : above_mbmi->ref_frame[var_ref_idx];
+      MV_REFERENCE_FRAME vrfl = l_sg ? left_mbmi->ref_frame[0]
+                                     : left_mbmi->ref_frame[var_ref_idx];
+
+      if (vrfa == vrfl && cm->comp_var_ref[1] == vrfa) {
+        pred_context = 0;
+      } else if (l_sg && a_sg) {  // single/single
+        if ((vrfa == cm->comp_fixed_ref && vrfl == cm->comp_var_ref[0]) ||
+            (vrfl == cm->comp_fixed_ref && vrfa == cm->comp_var_ref[0]))
+          pred_context = 4;
+        else if (vrfa == vrfl)
+          pred_context = 3;
+        else
+          pred_context = 1;
+      } else if (l_sg || a_sg) {  // single/comp
+        MV_REFERENCE_FRAME vrfc = l_sg ? vrfa : vrfl;
+        MV_REFERENCE_FRAME rfs = a_sg ? vrfa : vrfl;
+        if (vrfc == cm->comp_var_ref[1] && rfs != cm->comp_var_ref[1])
+          pred_context = 1;
+        else if (rfs == cm->comp_var_ref[1] && vrfc != cm->comp_var_ref[1])
+          pred_context = 2;
+        else
+          pred_context = 4;
+      } else if (vrfa == vrfl) {  // comp/comp
+        pred_context = 4;
+      } else {
+        pred_context = 2;
+      }
+    }
+  } else if (above_in_image || left_in_image) {  // one edge available
+    const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
+
+    if (!is_inter_block(edge_mbmi)) {
+      pred_context = 2;
+    } else {
+      if (has_second_ref(edge_mbmi))
+        pred_context = 4 * (edge_mbmi->ref_frame[var_ref_idx]
+                              != cm->comp_var_ref[1]);
+      else
+        pred_context = 3 * (edge_mbmi->ref_frame[0] != cm->comp_var_ref[1]);
+    }
+  } else {  // no edges available (2)
+    pred_context = 2;
+  }
+  assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
+
+  return pred_context;
+}
+unsigned char vp9_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) {
+  int pred_context;
+  const MODE_INFO *const above_mi = get_above_mi(xd);
+  const MODE_INFO *const left_mi = get_left_mi(xd);
+  const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
+  const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
+  const int above_in_image = above_mi != NULL;
+  const int left_in_image = left_mi != NULL;
+  const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
+  const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
+  // Note:
+  // The mode info data structure has a one element border above and to the
+  // left of the entries correpsonding to real macroblocks.
+  // The prediction flags in these dummy entries are initialised to 0.
+  if (above_in_image && left_in_image) {  // both edges available
+    if (above_intra && left_intra) {  // intra/intra
+      pred_context = 2;
+    } else if (above_intra || left_intra) {  // intra/inter or inter/intra
+      const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
+      if (!has_second_ref(edge_mbmi))
+        pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME);
+      else
+        pred_context = 1 + (edge_mbmi->ref_frame[0] == LAST_FRAME ||
+                            edge_mbmi->ref_frame[1] == LAST_FRAME);
+    } else {  // inter/inter
+      if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi)) {
+        pred_context = 2 * (above_mbmi->ref_frame[0] == LAST_FRAME) +
+                       2 * (left_mbmi->ref_frame[0] == LAST_FRAME);
+      } else if (has_second_ref(above_mbmi) && has_second_ref(left_mbmi)) {
+        pred_context = 1 + (above_mbmi->ref_frame[0] == LAST_FRAME ||
+                            above_mbmi->ref_frame[1] == LAST_FRAME ||
+                            left_mbmi->ref_frame[0] == LAST_FRAME ||
+                            left_mbmi->ref_frame[1] == LAST_FRAME);
+      } else {
+        const MV_REFERENCE_FRAME rfs = !has_second_ref(above_mbmi) ?
+                  above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
+        const MV_REFERENCE_FRAME crf1 = has_second_ref(above_mbmi) ?
+                  above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
+        const MV_REFERENCE_FRAME crf2 = has_second_ref(above_mbmi) ?
+                  above_mbmi->ref_frame[1] : left_mbmi->ref_frame[1];
+
+        if (rfs == LAST_FRAME)
+          pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
+        else
+          pred_context = crf1 == LAST_FRAME || crf2 == LAST_FRAME;
+      }
+    }
+  } else if (above_in_image || left_in_image) {  // one edge available
+    const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
+    if (!is_inter_block(edge_mbmi)) {  // intra
+      pred_context = 2;
+    } else {  // inter
+      if (!has_second_ref(edge_mbmi))
+        pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME);
+      else
+        pred_context = 1 + (edge_mbmi->ref_frame[0] == LAST_FRAME ||
+                            edge_mbmi->ref_frame[1] == LAST_FRAME);
+    }
+  } else {  // no edges available
+    pred_context = 2;
+  }
+
+  assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
+  return pred_context;
+}
+
+unsigned char vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) {
+  int pred_context;
+  const MODE_INFO *const above_mi = get_above_mi(xd);
+  const MODE_INFO *const left_mi = get_left_mi(xd);
+  const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
+  const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
+  const int above_in_image = above_mi != NULL;
+  const int left_in_image = left_mi != NULL;
+  const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
+  const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
+
+  // Note:
+  // The mode info data structure has a one element border above and to the
+  // left of the entries correpsonding to real macroblocks.
+  // The prediction flags in these dummy entries are initialised to 0.
+  if (above_in_image && left_in_image) {  // both edges available
+    if (above_intra && left_intra) {  // intra/intra
+      pred_context = 2;
+    } else if (above_intra || left_intra) {  // intra/inter or inter/intra
+      const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
+      if (!has_second_ref(edge_mbmi)) {
+        if (edge_mbmi->ref_frame[0] == LAST_FRAME)
+          pred_context = 3;
+        else
+          pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
+      } else {
+        pred_context = 1 + 2 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME ||
+                                edge_mbmi->ref_frame[1] == GOLDEN_FRAME);
+      }
+    } else {  // inter/inter
+      if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi)) {
+        if (above_mbmi->ref_frame[0] == LAST_FRAME &&
+            left_mbmi->ref_frame[0] == LAST_FRAME) {
+          pred_context = 3;
+        } else if (above_mbmi->ref_frame[0] == LAST_FRAME ||
+                   left_mbmi->ref_frame[0] == LAST_FRAME) {
+          const MB_MODE_INFO *edge_mbmi =
+              above_mbmi->ref_frame[0] == LAST_FRAME ? left_mbmi : above_mbmi;
+
+          pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
+        } else {
+          pred_context = 2 * (above_mbmi->ref_frame[0] == GOLDEN_FRAME) +
+                         2 * (left_mbmi->ref_frame[0] == GOLDEN_FRAME);
+        }
+      } else if (has_second_ref(above_mbmi) && has_second_ref(left_mbmi)) {
+        if (above_mbmi->ref_frame[0] == left_mbmi->ref_frame[0] &&
+            above_mbmi->ref_frame[1] == left_mbmi->ref_frame[1])
+          pred_context = 3 * (above_mbmi->ref_frame[0] == GOLDEN_FRAME ||
+                              above_mbmi->ref_frame[1] == GOLDEN_FRAME ||
+                              left_mbmi->ref_frame[0] == GOLDEN_FRAME ||
+                              left_mbmi->ref_frame[1] == GOLDEN_FRAME);
+        else
+          pred_context = 2;
+      } else {
+        const MV_REFERENCE_FRAME rfs = !has_second_ref(above_mbmi) ?
+                  above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
+        const MV_REFERENCE_FRAME crf1 = has_second_ref(above_mbmi) ?
+                  above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
+        const MV_REFERENCE_FRAME crf2 = has_second_ref(above_mbmi) ?
+                  above_mbmi->ref_frame[1] : left_mbmi->ref_frame[1];
+
+        if (rfs == GOLDEN_FRAME)
+          pred_context = 3 + (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
+        else if (rfs == ALTREF_FRAME)
+          pred_context = crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME;
+        else
+          pred_context = 1 + 2 * (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
+      }
+    }
+  } else if (above_in_image || left_in_image) {  // one edge available
+    const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
+
+    if (!is_inter_block(edge_mbmi) ||
+        (edge_mbmi->ref_frame[0] == LAST_FRAME && !has_second_ref(edge_mbmi)))
+      pred_context = 2;
+    else if (!has_second_ref(edge_mbmi))
+      pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
+    else
+      pred_context = 3 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME ||
+                          edge_mbmi->ref_frame[1] == GOLDEN_FRAME);
+  } else {  // no edges available (2)
+    pred_context = 2;
+  }
+  assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
+  return pred_context;
+}
+// Returns a context number for the given MB prediction signal
+// The mode info data structure has a one element border above and to the
+// left of the entries corresponding to real blocks.
+// The prediction flags in these dummy entries are initialized to 0.
+unsigned char vp9_get_pred_context_tx_size(const MACROBLOCKD *xd) {
+  const MODE_INFO *const above_mi = get_above_mi(xd);
+  const MODE_INFO *const left_mi = get_left_mi(xd);
+  const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
+  const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
+  const int above_in_image = above_mi != NULL;
+  const int left_in_image = left_mi != NULL;
+  const int max_tx_size = max_txsize_lookup[xd->mi_8x8[0]->mbmi.sb_type];
+  int above_context = max_tx_size;
+  int left_context = max_tx_size;
+
+  if (above_in_image)
+    above_context = above_mbmi->skip_coeff ? max_tx_size
+                                           : above_mbmi->tx_size;
+
+  if (left_in_image)
+    left_context = left_mbmi->skip_coeff ? max_tx_size
+                                         : left_mbmi->tx_size;
+
+  if (!left_in_image)
+    left_context = above_context;
+
+  if (!above_in_image)
+    above_context = left_context;
+
+  return above_context + left_context > max_tx_size;
+}
+
+void vp9_set_pred_flag_seg_id(MACROBLOCKD *xd, uint8_t pred_flag) {
+  xd->mi_8x8[0]->mbmi.seg_id_predicted = pred_flag;
+}
+
+int vp9_get_segment_id(VP9_COMMON *cm, const uint8_t *segment_ids,
+                       BLOCK_SIZE bsize, int mi_row, int mi_col) {
+  const int mi_offset = mi_row * cm->mi_cols + mi_col;
+  const int bw = num_8x8_blocks_wide_lookup[bsize];
+  const int bh = num_8x8_blocks_high_lookup[bsize];
+  const int xmis = MIN(cm->mi_cols - mi_col, bw);
+  const int ymis = MIN(cm->mi_rows - mi_row, bh);
+  int x, y, segment_id = INT_MAX;
+
+  for (y = 0; y < ymis; y++)
+    for (x = 0; x < xmis; x++)
+      segment_id = MIN(segment_id,
+                       segment_ids[mi_offset + y * cm->mi_cols + x]);
+
+  assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
+  return segment_id;
+}