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;
}
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;
if (above_in_image && left_in_image)
return left_intra && above_intra ? 3
: left_intra || above_intra;
else if (above_in_image || left_in_image)
return 2 * (above_in_image ? above_intra : left_intra);
else
return 0;
}
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;
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;
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;
}
// 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
int vp9_get_intra_inter_context(const MACROBLOCKD *xd) {
const MB_MODE_INFO *const above_mbmi = get_mbmi(get_above_mi(xd));
const MB_MODE_INFO *const left_mbmi = get_mbmi(get_left_mi(xd));
const int has_above = above_mbmi != NULL;
const int has_left = left_mbmi != NULL;
if (has_above && has_left) { // both edges available
const int above_intra = !is_inter_block(above_mbmi);
const int left_intra = !is_inter_block(left_mbmi);
return left_intra && above_intra ? 3
: left_intra || above_intra;
} else if (has_above || has_left) { // one edge available
return 2 * !is_inter_block(has_above ? above_mbmi : left_mbmi);
} else {
return 0;
}
}
// 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.
int vp9_get_tx_size_context(const MACROBLOCKD *xd) {
const int max_tx_size = max_txsize_lookup[xd->mi_8x8[0]->mbmi.sb_type];
const MB_MODE_INFO *const above_mbmi = get_mbmi(get_above_mi(xd));
const MB_MODE_INFO *const left_mbmi = get_mbmi(get_left_mi(xd));
const int has_above = above_mbmi != NULL;
const int has_left = left_mbmi != NULL;
int above_ctx = (has_above && !above_mbmi->skip_coeff) ? above_mbmi->tx_size
: max_tx_size;
int left_ctx = (has_left && !left_mbmi->skip_coeff) ? left_mbmi->tx_size
: max_tx_size;
if (!has_left)
left_ctx = above_ctx;
if (!has_above)
above_ctx = left_ctx;
return (above_ctx + left_ctx) > max_tx_size;
}
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;
if (above_in_image && left_in_image) {
if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi))
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))
pred_context = 2 + (above_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
!is_inter_block(above_mbmi));
else if (!has_second_ref(left_mbmi))
pred_context = 2 + (left_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
!is_inter_block(left_mbmi));
else
pred_context = 4;
} else if (above_in_image || left_in_image) {
const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;
if (!has_second_ref(edge_mbmi))
pred_context = edge_mbmi->ref_frame[0] == cm->comp_fixed_ref;
else
pred_context = 3;
} else {
pred_context = 1;
}
assert(pred_context >= 0 && pred_context < COMP_INTER_CONTEXTS);
return pred_context;
}
int vp9_get_reference_mode_context(const VP9_COMMON *cm,
const MACROBLOCKD *xd) {
int ctx;
const MB_MODE_INFO *const above_mbmi = get_mbmi(get_above_mi(xd));
const MB_MODE_INFO *const left_mbmi = get_mbmi(get_left_mi(xd));
const int has_above = above_mbmi != NULL;
const int has_left = left_mbmi != 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 (has_above && has_left) { // both edges available
if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi))
// neither edge uses comp pred (0/1)
ctx = (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)
ctx = 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)
ctx = 2 + (left_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
!is_inter_block(left_mbmi));
else // both edges use comp pred (4)
ctx = 4;
} else if (has_above || has_left) { // one edge available
const MB_MODE_INFO *edge_mbmi = has_above ? above_mbmi : left_mbmi;
if (!has_second_ref(edge_mbmi))
// edge does not use comp pred (0/1)
ctx = edge_mbmi->ref_frame[0] == cm->comp_fixed_ref;
else
// edge uses comp pred (3)
ctx = 3;
} else { // no edges available (1)
ctx = 1;
}
assert(ctx >= 0 && ctx < COMP_INTER_CONTEXTS);
return ctx;
}
// Returns a context number for the given MB prediction signal
int vp9_get_pred_context_switchable_interp(const MACROBLOCKD *xd) {
// 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 MB_MODE_INFO *const left_mbmi = get_mbmi(get_left_mi(xd));
const int left_type = left_mbmi != NULL && is_inter_block(left_mbmi) ?
left_mbmi->interp_filter : SWITCHABLE_FILTERS;
const MB_MODE_INFO *const above_mbmi = get_mbmi(get_above_mi(xd));
const int above_type = above_mbmi != NULL && is_inter_block(above_mbmi) ?
above_mbmi->interp_filter : SWITCHABLE_FILTERS;
if (left_type == above_type)
return left_type;
else if (left_type == SWITCHABLE_FILTERS && above_type != SWITCHABLE_FILTERS)
return above_type;
else if (left_type != SWITCHABLE_FILTERS && above_type == SWITCHABLE_FILTERS)
return left_type;
else
return SWITCHABLE_FILTERS;
}
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;
if (above_in_image && left_in_image) {
if (above_intra && left_intra) {
pred_context = 2;
} else if (above_intra || left_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 {
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) {
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 {
pred_context = 2;
}
assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
return pred_context;
}
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;
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) {
if (above_intra && left_intra) {
pred_context = 2;
} else if (above_intra || left_intra) {
const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
if (!has_second_ref(edge_mbmi))
pred_context = 1 + 2 * (edge_mbmi->ref_frame[0] != cm->comp_var_ref[1]);
else
pred_context = 1 + 2 * (edge_mbmi->ref_frame[var_ref_idx]
!= cm->comp_var_ref[1]);
} else {
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) {
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) {
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) {
pred_context = 4;
} else {
pred_context = 2;
}
}
} else if (above_in_image || left_in_image) {
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 {
pred_context = 2;
}
assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
return pred_context;
}
int vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) {
int pred_context;
const MB_MODE_INFO *const above_mbmi = get_mbmi(get_above_mi(xd));
const MB_MODE_INFO *const left_mbmi = get_mbmi(get_left_mi(xd));
const int has_above = above_mbmi != NULL;
const int has_left = left_mbmi != 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 (has_above && has_left) { // both edges available
const int above_intra = !is_inter_block(above_mbmi);
const int left_intra = !is_inter_block(left_mbmi);
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
const int above_has_second = has_second_ref(above_mbmi);
const int left_has_second = has_second_ref(left_mbmi);
if (above_has_second && left_has_second) {
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 if (above_has_second || left_has_second) {
const MV_REFERENCE_FRAME rfs = !above_has_second ?
above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
const MV_REFERENCE_FRAME crf1 = above_has_second ?
above_mbmi->ref_frame[0] : left_mbmi->ref_frame[0];
const MV_REFERENCE_FRAME crf2 = above_has_second ?
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_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_above || has_left) { // one edge available
const MB_MODE_INFO *edge_mbmi = has_above ? 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
int vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm,
const MACROBLOCKD *xd) {
int pred_context;
const MB_MODE_INFO *const above_mbmi = get_mbmi(get_above_mi(xd));
const MB_MODE_INFO *const left_mbmi = get_mbmi(get_left_mi(xd));
const int above_in_image = above_mbmi != NULL;
const int left_in_image = left_mbmi != 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.
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
const int above_intra = !is_inter_block(above_mbmi);
const int left_intra = !is_inter_block(left_mbmi);
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);
const MV_REFERENCE_FRAME vrfa = a_sg ? above_mbmi->ref_frame[0]
: above_mbmi->ref_frame[var_ref_idx];
const 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
const MV_REFERENCE_FRAME vrfc = l_sg ? vrfa : vrfl;
const 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;
}