michael@0: 
michael@0: /*
michael@0:  *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
michael@0:  *
michael@0:  *  Use of this source code is governed by a BSD-style license
michael@0:  *  that can be found in the LICENSE file in the root of the source
michael@0:  *  tree. An additional intellectual property rights grant can be found
michael@0:  *  in the file PATENTS.  All contributing project authors may
michael@0:  *  be found in the AUTHORS file in the root of the source tree.
michael@0:  */
michael@0: 
michael@0: #include <limits.h>
michael@0: 
michael@0: #include "vp9/common/vp9_common.h"
michael@0: #include "vp9/common/vp9_pred_common.h"
michael@0: #include "vp9/common/vp9_seg_common.h"
michael@0: #include "vp9/common/vp9_treecoder.h"
michael@0: 
michael@0: static INLINE const MB_MODE_INFO *get_above_mbmi(const MODE_INFO *const above) {
michael@0:   return (above != NULL) ? &above->mbmi : NULL;
michael@0: }
michael@0: 
michael@0: static INLINE const MB_MODE_INFO *get_left_mbmi(const MODE_INFO *const left) {
michael@0:   return (left != NULL) ? &left->mbmi : NULL;
michael@0: }
michael@0: 
michael@0: // Returns a context number for the given MB prediction signal
michael@0: unsigned char vp9_get_pred_context_switchable_interp(const MACROBLOCKD *xd) {
michael@0:   const MODE_INFO *const above_mi = get_above_mi(xd);
michael@0:   const MODE_INFO *const left_mi = get_left_mi(xd);
michael@0:   const int above_in_image = above_mi != NULL;
michael@0:   const int left_in_image = left_mi != NULL;
michael@0:   // Note:
michael@0:   // The mode info data structure has a one element border above and to the
michael@0:   // left of the entries correpsonding to real macroblocks.
michael@0:   // The prediction flags in these dummy entries are initialised to 0.
michael@0:   // left
michael@0:   const int left_mv_pred = left_in_image ? is_inter_block(&left_mi->mbmi)
michael@0:                                          : 0;
michael@0:   const int left_interp = left_in_image && left_mv_pred
michael@0:                               ? left_mi->mbmi.interp_filter
michael@0:                               : SWITCHABLE_FILTERS;
michael@0: 
michael@0:   // above
michael@0:   const int above_mv_pred = above_in_image ? is_inter_block(&above_mi->mbmi)
michael@0:                                            : 0;
michael@0:   const int above_interp = above_in_image && above_mv_pred
michael@0:                                ? above_mi->mbmi.interp_filter
michael@0:                                : SWITCHABLE_FILTERS;
michael@0: 
michael@0:   if (left_interp == above_interp)
michael@0:     return left_interp;
michael@0:   else if (left_interp == SWITCHABLE_FILTERS &&
michael@0:            above_interp != SWITCHABLE_FILTERS)
michael@0:     return above_interp;
michael@0:   else if (left_interp != SWITCHABLE_FILTERS &&
michael@0:            above_interp == SWITCHABLE_FILTERS)
michael@0:     return left_interp;
michael@0:   else
michael@0:     return SWITCHABLE_FILTERS;
michael@0: }
michael@0: // Returns a context number for the given MB prediction signal
michael@0: unsigned char vp9_get_pred_context_intra_inter(const MACROBLOCKD *xd) {
michael@0:   const MODE_INFO *const above_mi = get_above_mi(xd);
michael@0:   const MODE_INFO *const left_mi = get_left_mi(xd);
michael@0:   const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
michael@0:   const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
michael@0:   const int above_in_image = above_mi != NULL;
michael@0:   const int left_in_image = left_mi != NULL;
michael@0:   const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
michael@0:   const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
michael@0: 
michael@0:   // The mode info data structure has a one element border above and to the
michael@0:   // left of the entries corresponding to real macroblocks.
michael@0:   // The prediction flags in these dummy entries are initialized to 0.
michael@0:   // 0 - inter/inter, inter/--, --/inter, --/--
michael@0:   // 1 - intra/inter, inter/intra
michael@0:   // 2 - intra/--, --/intra
michael@0:   // 3 - intra/intra
michael@0:   if (above_in_image && left_in_image)  // both edges available
michael@0:     return left_intra && above_intra ? 3
michael@0:                                      : left_intra || above_intra;
michael@0:   else if (above_in_image || left_in_image)  // one edge available
michael@0:     return 2 * (above_in_image ? above_intra : left_intra);
michael@0:   else
michael@0:     return 0;
michael@0: }
michael@0: // Returns a context number for the given MB prediction signal
michael@0: unsigned char vp9_get_pred_context_comp_inter_inter(const VP9_COMMON *cm,
michael@0:                                                     const MACROBLOCKD *xd) {
michael@0:   int pred_context;
michael@0:   const MODE_INFO *const above_mi = get_above_mi(xd);
michael@0:   const MODE_INFO *const left_mi = get_left_mi(xd);
michael@0:   const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
michael@0:   const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
michael@0:   const int above_in_image = above_mi != NULL;
michael@0:   const int left_in_image = left_mi != NULL;
michael@0:   // Note:
michael@0:   // The mode info data structure has a one element border above and to the
michael@0:   // left of the entries correpsonding to real macroblocks.
michael@0:   // The prediction flags in these dummy entries are initialised to 0.
michael@0:   if (above_in_image && left_in_image) {  // both edges available
michael@0:     if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi))
michael@0:       // neither edge uses comp pred (0/1)
michael@0:       pred_context = (above_mbmi->ref_frame[0] == cm->comp_fixed_ref) ^
michael@0:                      (left_mbmi->ref_frame[0] == cm->comp_fixed_ref);
michael@0:     else if (!has_second_ref(above_mbmi))
michael@0:       // one of two edges uses comp pred (2/3)
michael@0:       pred_context = 2 + (above_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
michael@0:                           !is_inter_block(above_mbmi));
michael@0:     else if (!has_second_ref(left_mbmi))
michael@0:       // one of two edges uses comp pred (2/3)
michael@0:       pred_context = 2 + (left_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
michael@0:                           !is_inter_block(left_mbmi));
michael@0:     else  // both edges use comp pred (4)
michael@0:       pred_context = 4;
michael@0:   } else if (above_in_image || left_in_image) {  // one edge available
michael@0:     const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
michael@0: 
michael@0:     if (!has_second_ref(edge_mbmi))
michael@0:       // edge does not use comp pred (0/1)
michael@0:       pred_context = edge_mbmi->ref_frame[0] == cm->comp_fixed_ref;
michael@0:     else
michael@0:       // edge uses comp pred (3)
michael@0:       pred_context = 3;
michael@0:   } else {  // no edges available (1)
michael@0:     pred_context = 1;
michael@0:   }
michael@0:   assert(pred_context >= 0 && pred_context < COMP_INTER_CONTEXTS);
michael@0:   return pred_context;
michael@0: }
michael@0: 
michael@0: // Returns a context number for the given MB prediction signal
michael@0: unsigned char vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm,
michael@0:                                               const MACROBLOCKD *xd) {
michael@0:   int pred_context;
michael@0:   const MODE_INFO *const above_mi = get_above_mi(xd);
michael@0:   const MODE_INFO *const left_mi = get_left_mi(xd);
michael@0:   const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
michael@0:   const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
michael@0:   const int above_in_image = above_mi != NULL;
michael@0:   const int left_in_image = left_mi != NULL;
michael@0:   const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
michael@0:   const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
michael@0:   // Note:
michael@0:   // The mode info data structure has a one element border above and to the
michael@0:   // left of the entries correpsonding to real macroblocks.
michael@0:   // The prediction flags in these dummy entries are initialised to 0.
michael@0:   const int fix_ref_idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
michael@0:   const int var_ref_idx = !fix_ref_idx;
michael@0: 
michael@0:   if (above_in_image && left_in_image) {  // both edges available
michael@0:     if (above_intra && left_intra) {  // intra/intra (2)
michael@0:       pred_context = 2;
michael@0:     } else if (above_intra || left_intra) {  // intra/inter
michael@0:       const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
michael@0: 
michael@0:       if (!has_second_ref(edge_mbmi))  // single pred (1/3)
michael@0:         pred_context = 1 + 2 * (edge_mbmi->ref_frame[0] != cm->comp_var_ref[1]);
michael@0:       else  // comp pred (1/3)
michael@0:         pred_context = 1 + 2 * (edge_mbmi->ref_frame[var_ref_idx]
michael@0:                                     != cm->comp_var_ref[1]);
michael@0:     } else {  // inter/inter
michael@0:       const int l_sg = !has_second_ref(left_mbmi);
michael@0:       const int a_sg = !has_second_ref(above_mbmi);
michael@0:       MV_REFERENCE_FRAME vrfa = a_sg ? above_mbmi->ref_frame[0]
michael@0:                                      : above_mbmi->ref_frame[var_ref_idx];
michael@0:       MV_REFERENCE_FRAME vrfl = l_sg ? left_mbmi->ref_frame[0]
michael@0:                                      : left_mbmi->ref_frame[var_ref_idx];
michael@0: 
michael@0:       if (vrfa == vrfl && cm->comp_var_ref[1] == vrfa) {
michael@0:         pred_context = 0;
michael@0:       } else if (l_sg && a_sg) {  // single/single
michael@0:         if ((vrfa == cm->comp_fixed_ref && vrfl == cm->comp_var_ref[0]) ||
michael@0:             (vrfl == cm->comp_fixed_ref && vrfa == cm->comp_var_ref[0]))
michael@0:           pred_context = 4;
michael@0:         else if (vrfa == vrfl)
michael@0:           pred_context = 3;
michael@0:         else
michael@0:           pred_context = 1;
michael@0:       } else if (l_sg || a_sg) {  // single/comp
michael@0:         MV_REFERENCE_FRAME vrfc = l_sg ? vrfa : vrfl;
michael@0:         MV_REFERENCE_FRAME rfs = a_sg ? vrfa : vrfl;
michael@0:         if (vrfc == cm->comp_var_ref[1] && rfs != cm->comp_var_ref[1])
michael@0:           pred_context = 1;
michael@0:         else if (rfs == cm->comp_var_ref[1] && vrfc != cm->comp_var_ref[1])
michael@0:           pred_context = 2;
michael@0:         else
michael@0:           pred_context = 4;
michael@0:       } else if (vrfa == vrfl) {  // comp/comp
michael@0:         pred_context = 4;
michael@0:       } else {
michael@0:         pred_context = 2;
michael@0:       }
michael@0:     }
michael@0:   } else if (above_in_image || left_in_image) {  // one edge available
michael@0:     const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
michael@0: 
michael@0:     if (!is_inter_block(edge_mbmi)) {
michael@0:       pred_context = 2;
michael@0:     } else {
michael@0:       if (has_second_ref(edge_mbmi))
michael@0:         pred_context = 4 * (edge_mbmi->ref_frame[var_ref_idx]
michael@0:                               != cm->comp_var_ref[1]);
michael@0:       else
michael@0:         pred_context = 3 * (edge_mbmi->ref_frame[0] != cm->comp_var_ref[1]);
michael@0:     }
michael@0:   } else {  // no edges available (2)
michael@0:     pred_context = 2;
michael@0:   }
michael@0:   assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
michael@0: 
michael@0:   return pred_context;
michael@0: }
michael@0: unsigned char vp9_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) {
michael@0:   int pred_context;
michael@0:   const MODE_INFO *const above_mi = get_above_mi(xd);
michael@0:   const MODE_INFO *const left_mi = get_left_mi(xd);
michael@0:   const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
michael@0:   const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
michael@0:   const int above_in_image = above_mi != NULL;
michael@0:   const int left_in_image = left_mi != NULL;
michael@0:   const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
michael@0:   const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
michael@0:   // Note:
michael@0:   // The mode info data structure has a one element border above and to the
michael@0:   // left of the entries correpsonding to real macroblocks.
michael@0:   // The prediction flags in these dummy entries are initialised to 0.
michael@0:   if (above_in_image && left_in_image) {  // both edges available
michael@0:     if (above_intra && left_intra) {  // intra/intra
michael@0:       pred_context = 2;
michael@0:     } else if (above_intra || left_intra) {  // intra/inter or inter/intra
michael@0:       const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
michael@0:       if (!has_second_ref(edge_mbmi))
michael@0:         pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME);
michael@0:       else
michael@0:         pred_context = 1 + (edge_mbmi->ref_frame[0] == LAST_FRAME ||
michael@0:                             edge_mbmi->ref_frame[1] == LAST_FRAME);
michael@0:     } else {  // inter/inter
michael@0:       if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi)) {
michael@0:         pred_context = 2 * (above_mbmi->ref_frame[0] == LAST_FRAME) +
michael@0:                        2 * (left_mbmi->ref_frame[0] == LAST_FRAME);
michael@0:       } else if (has_second_ref(above_mbmi) && has_second_ref(left_mbmi)) {
michael@0:         pred_context = 1 + (above_mbmi->ref_frame[0] == LAST_FRAME ||
michael@0:                             above_mbmi->ref_frame[1] == LAST_FRAME ||
michael@0:                             left_mbmi->ref_frame[0] == LAST_FRAME ||
michael@0:                             left_mbmi->ref_frame[1] == LAST_FRAME);
michael@0:       } else {
michael@0:         const MV_REFERENCE_FRAME rfs = !has_second_ref(above_mbmi) ?
michael@0:                   above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
michael@0:         const MV_REFERENCE_FRAME crf1 = has_second_ref(above_mbmi) ?
michael@0:                   above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
michael@0:         const MV_REFERENCE_FRAME crf2 = has_second_ref(above_mbmi) ?
michael@0:                   above_mbmi->ref_frame[1] : left_mbmi->ref_frame[1];
michael@0: 
michael@0:         if (rfs == LAST_FRAME)
michael@0:           pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
michael@0:         else
michael@0:           pred_context = crf1 == LAST_FRAME || crf2 == LAST_FRAME;
michael@0:       }
michael@0:     }
michael@0:   } else if (above_in_image || left_in_image) {  // one edge available
michael@0:     const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
michael@0:     if (!is_inter_block(edge_mbmi)) {  // intra
michael@0:       pred_context = 2;
michael@0:     } else {  // inter
michael@0:       if (!has_second_ref(edge_mbmi))
michael@0:         pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME);
michael@0:       else
michael@0:         pred_context = 1 + (edge_mbmi->ref_frame[0] == LAST_FRAME ||
michael@0:                             edge_mbmi->ref_frame[1] == LAST_FRAME);
michael@0:     }
michael@0:   } else {  // no edges available
michael@0:     pred_context = 2;
michael@0:   }
michael@0: 
michael@0:   assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
michael@0:   return pred_context;
michael@0: }
michael@0: 
michael@0: unsigned char vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) {
michael@0:   int pred_context;
michael@0:   const MODE_INFO *const above_mi = get_above_mi(xd);
michael@0:   const MODE_INFO *const left_mi = get_left_mi(xd);
michael@0:   const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
michael@0:   const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
michael@0:   const int above_in_image = above_mi != NULL;
michael@0:   const int left_in_image = left_mi != NULL;
michael@0:   const int above_intra = above_in_image ? !is_inter_block(above_mbmi) : 1;
michael@0:   const int left_intra = left_in_image ? !is_inter_block(left_mbmi) : 1;
michael@0: 
michael@0:   // Note:
michael@0:   // The mode info data structure has a one element border above and to the
michael@0:   // left of the entries correpsonding to real macroblocks.
michael@0:   // The prediction flags in these dummy entries are initialised to 0.
michael@0:   if (above_in_image && left_in_image) {  // both edges available
michael@0:     if (above_intra && left_intra) {  // intra/intra
michael@0:       pred_context = 2;
michael@0:     } else if (above_intra || left_intra) {  // intra/inter or inter/intra
michael@0:       const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
michael@0:       if (!has_second_ref(edge_mbmi)) {
michael@0:         if (edge_mbmi->ref_frame[0] == LAST_FRAME)
michael@0:           pred_context = 3;
michael@0:         else
michael@0:           pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
michael@0:       } else {
michael@0:         pred_context = 1 + 2 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME ||
michael@0:                                 edge_mbmi->ref_frame[1] == GOLDEN_FRAME);
michael@0:       }
michael@0:     } else {  // inter/inter
michael@0:       if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi)) {
michael@0:         if (above_mbmi->ref_frame[0] == LAST_FRAME &&
michael@0:             left_mbmi->ref_frame[0] == LAST_FRAME) {
michael@0:           pred_context = 3;
michael@0:         } else if (above_mbmi->ref_frame[0] == LAST_FRAME ||
michael@0:                    left_mbmi->ref_frame[0] == LAST_FRAME) {
michael@0:           const MB_MODE_INFO *edge_mbmi =
michael@0:               above_mbmi->ref_frame[0] == LAST_FRAME ? left_mbmi : above_mbmi;
michael@0: 
michael@0:           pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
michael@0:         } else {
michael@0:           pred_context = 2 * (above_mbmi->ref_frame[0] == GOLDEN_FRAME) +
michael@0:                          2 * (left_mbmi->ref_frame[0] == GOLDEN_FRAME);
michael@0:         }
michael@0:       } else if (has_second_ref(above_mbmi) && has_second_ref(left_mbmi)) {
michael@0:         if (above_mbmi->ref_frame[0] == left_mbmi->ref_frame[0] &&
michael@0:             above_mbmi->ref_frame[1] == left_mbmi->ref_frame[1])
michael@0:           pred_context = 3 * (above_mbmi->ref_frame[0] == GOLDEN_FRAME ||
michael@0:                               above_mbmi->ref_frame[1] == GOLDEN_FRAME ||
michael@0:                               left_mbmi->ref_frame[0] == GOLDEN_FRAME ||
michael@0:                               left_mbmi->ref_frame[1] == GOLDEN_FRAME);
michael@0:         else
michael@0:           pred_context = 2;
michael@0:       } else {
michael@0:         const MV_REFERENCE_FRAME rfs = !has_second_ref(above_mbmi) ?
michael@0:                   above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
michael@0:         const MV_REFERENCE_FRAME crf1 = has_second_ref(above_mbmi) ?
michael@0:                   above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
michael@0:         const MV_REFERENCE_FRAME crf2 = has_second_ref(above_mbmi) ?
michael@0:                   above_mbmi->ref_frame[1] : left_mbmi->ref_frame[1];
michael@0: 
michael@0:         if (rfs == GOLDEN_FRAME)
michael@0:           pred_context = 3 + (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
michael@0:         else if (rfs == ALTREF_FRAME)
michael@0:           pred_context = crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME;
michael@0:         else
michael@0:           pred_context = 1 + 2 * (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
michael@0:       }
michael@0:     }
michael@0:   } else if (above_in_image || left_in_image) {  // one edge available
michael@0:     const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
michael@0: 
michael@0:     if (!is_inter_block(edge_mbmi) ||
michael@0:         (edge_mbmi->ref_frame[0] == LAST_FRAME && !has_second_ref(edge_mbmi)))
michael@0:       pred_context = 2;
michael@0:     else if (!has_second_ref(edge_mbmi))
michael@0:       pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
michael@0:     else
michael@0:       pred_context = 3 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME ||
michael@0:                           edge_mbmi->ref_frame[1] == GOLDEN_FRAME);
michael@0:   } else {  // no edges available (2)
michael@0:     pred_context = 2;
michael@0:   }
michael@0:   assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
michael@0:   return pred_context;
michael@0: }
michael@0: // Returns a context number for the given MB prediction signal
michael@0: // The mode info data structure has a one element border above and to the
michael@0: // left of the entries corresponding to real blocks.
michael@0: // The prediction flags in these dummy entries are initialized to 0.
michael@0: unsigned char vp9_get_pred_context_tx_size(const MACROBLOCKD *xd) {
michael@0:   const MODE_INFO *const above_mi = get_above_mi(xd);
michael@0:   const MODE_INFO *const left_mi = get_left_mi(xd);
michael@0:   const MB_MODE_INFO *const above_mbmi = get_above_mbmi(above_mi);
michael@0:   const MB_MODE_INFO *const left_mbmi = get_left_mbmi(left_mi);
michael@0:   const int above_in_image = above_mi != NULL;
michael@0:   const int left_in_image = left_mi != NULL;
michael@0:   const int max_tx_size = max_txsize_lookup[xd->mi_8x8[0]->mbmi.sb_type];
michael@0:   int above_context = max_tx_size;
michael@0:   int left_context = max_tx_size;
michael@0: 
michael@0:   if (above_in_image)
michael@0:     above_context = above_mbmi->skip_coeff ? max_tx_size
michael@0:                                            : above_mbmi->tx_size;
michael@0: 
michael@0:   if (left_in_image)
michael@0:     left_context = left_mbmi->skip_coeff ? max_tx_size
michael@0:                                          : left_mbmi->tx_size;
michael@0: 
michael@0:   if (!left_in_image)
michael@0:     left_context = above_context;
michael@0: 
michael@0:   if (!above_in_image)
michael@0:     above_context = left_context;
michael@0: 
michael@0:   return above_context + left_context > max_tx_size;
michael@0: }
michael@0: 
michael@0: void vp9_set_pred_flag_seg_id(MACROBLOCKD *xd, uint8_t pred_flag) {
michael@0:   xd->mi_8x8[0]->mbmi.seg_id_predicted = pred_flag;
michael@0: }
michael@0: 
michael@0: int vp9_get_segment_id(VP9_COMMON *cm, const uint8_t *segment_ids,
michael@0:                        BLOCK_SIZE bsize, int mi_row, int mi_col) {
michael@0:   const int mi_offset = mi_row * cm->mi_cols + mi_col;
michael@0:   const int bw = num_8x8_blocks_wide_lookup[bsize];
michael@0:   const int bh = num_8x8_blocks_high_lookup[bsize];
michael@0:   const int xmis = MIN(cm->mi_cols - mi_col, bw);
michael@0:   const int ymis = MIN(cm->mi_rows - mi_row, bh);
michael@0:   int x, y, segment_id = INT_MAX;
michael@0: 
michael@0:   for (y = 0; y < ymis; y++)
michael@0:     for (x = 0; x < xmis; x++)
michael@0:       segment_id = MIN(segment_id,
michael@0:                        segment_ids[mi_offset + y * cm->mi_cols + x]);
michael@0: 
michael@0:   assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
michael@0:   return segment_id;
michael@0: }