// This function encodes the reference frame
static void write_ref_frames(const VP9_COMMON *cm, const MACROBLOCKD *xd,
vpx_writer *w) {
const MODE_INFO *const mi = xd->mi[0];
const int is_compound = has_second_ref(mi);
const int segment_id = mi->segment_id;
// If segment level coding of this signal is disabled...
// or the segment allows multiple reference frame options
if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
assert(!is_compound);
assert(mi->ref_frame[0] ==
get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME));
} else {
// does the feature use compound prediction or not
// (if not specified at the frame/segment level)
if (cm->reference_mode == REFERENCE_MODE_SELECT) {
vpx_write(w, is_compound, vp9_get_reference_mode_prob(cm, xd));
} else {
assert(!is_compound == (cm->reference_mode == SINGLE_REFERENCE));
}
if (is_compound) {
vpx_write(w, mi->ref_frame[0] == GOLDEN_FRAME,
vp9_get_pred_prob_comp_ref_p(cm, xd));
} else {
const int bit0 = mi->ref_frame[0] != LAST_FRAME;
vpx_write(w, bit0, vp9_get_pred_prob_single_ref_p1(cm, xd));
if (bit0) {
const int bit1 = mi->ref_frame[0] != GOLDEN_FRAME;
vpx_write(w, bit1, vp9_get_pred_prob_single_ref_p2(cm, xd));
}
}
}
}
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 MODE_INFO *const above_mi = xd->above_mi;
const MODE_INFO *const left_mi = xd->left_mi;
const int has_above = !!above_mi;
const int has_left = !!left_mi;
// Note:
// 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.
if (has_above && has_left) { // both edges available
if (!has_second_ref(above_mi) && !has_second_ref(left_mi))
// neither edge uses comp pred (0/1)
ctx = (above_mi->ref_frame[0] == cm->comp_fixed_ref) ^
(left_mi->ref_frame[0] == cm->comp_fixed_ref);
else if (!has_second_ref(above_mi))
// one of two edges uses comp pred (2/3)
ctx = 2 + (above_mi->ref_frame[0] == cm->comp_fixed_ref ||
!is_inter_block(above_mi));
else if (!has_second_ref(left_mi))
// one of two edges uses comp pred (2/3)
ctx = 2 + (left_mi->ref_frame[0] == cm->comp_fixed_ref ||
!is_inter_block(left_mi));
else // both edges use comp pred (4)
ctx = 4;
} else if (has_above || has_left) { // one edge available
const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
if (!has_second_ref(edge_mi))
// edge does not use comp pred (0/1)
ctx = edge_mi->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;
}
static void read_inter_block_mode_info(VP9_COMMON *const cm,
MACROBLOCKD *const xd,
const TileInfo *const tile,
MODE_INFO *const mi,
int mi_row, int mi_col, vp9_reader *r) {
MB_MODE_INFO *const mbmi = &mi->mbmi;
const BLOCK_SIZE bsize = mbmi->sb_type;
const int allow_hp = cm->allow_high_precision_mv;
int_mv nearest[2], nearmv[2], best[2];
int inter_mode_ctx, ref, is_compound;
read_ref_frames(cm, xd, r, mbmi->segment_id, mbmi->ref_frame);
is_compound = has_second_ref(mbmi);
for (ref = 0; ref < 1 + is_compound; ++ref) {
const MV_REFERENCE_FRAME frame = mbmi->ref_frame[ref];
vp9_find_mv_refs(cm, xd, tile, mi, xd->last_mi, frame, mbmi->ref_mvs[frame],
mi_row, mi_col);
}
inter_mode_ctx = mbmi->mode_context[mbmi->ref_frame[0]];
if (vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
mbmi->mode = ZEROMV;
if (bsize < BLOCK_8X8) {
vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
"Invalid usage of segement feature on small blocks");
return;
}
} else {
if (bsize >= BLOCK_8X8)
mbmi->mode = read_inter_mode(cm, r, inter_mode_ctx);
}
if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
for (ref = 0; ref < 1 + is_compound; ++ref) {
vp9_find_best_ref_mvs(xd, allow_hp, mbmi->ref_mvs[mbmi->ref_frame[ref]],
&nearest[ref], &nearmv[ref]);
best[ref].as_int = nearest[ref].as_int;
}
}
mbmi->interp_filter = (cm->mcomp_filter_type == SWITCHABLE)
? read_switchable_filter_type(cm, xd, r)
: cm->mcomp_filter_type;
if (bsize < BLOCK_8X8) {
const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
int idx, idy;
int b_mode;
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
int_mv block[2];
const int j = idy * 2 + idx;
b_mode = read_inter_mode(cm, r, inter_mode_ctx);
if (b_mode == NEARESTMV || b_mode == NEARMV)
for (ref = 0; ref < 1 + is_compound; ++ref)
vp9_append_sub8x8_mvs_for_idx(cm, xd, tile, j, ref, mi_row, mi_col,
&nearest[ref], &nearmv[ref]);
if (!assign_mv(cm, b_mode, block, best, nearest, nearmv,
is_compound, allow_hp, r)) {
xd->corrupted |= 1;
break;
};
mi->bmi[j].as_mv[0].as_int = block[0].as_int;
if (is_compound)
mi->bmi[j].as_mv[1].as_int = block[1].as_int;
if (num_4x4_h == 2)
mi->bmi[j + 2] = mi->bmi[j];
if (num_4x4_w == 2)
mi->bmi[j + 1] = mi->bmi[j];
}
}
mi->mbmi.mode = b_mode;
mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
} else {
xd->corrupted |= !assign_mv(cm, mbmi->mode, mbmi->mv,
best, nearest, nearmv,
is_compound, allow_hp, r);
}
}
static void pack_inter_mode_mvs(VP9_COMP *cpi, const MODE_INFO *mi,
vpx_writer *w) {
VP9_COMMON *const cm = &cpi->common;
const nmv_context *nmvc = &cm->fc->nmvc;
const MACROBLOCK *const x = &cpi->td.mb;
const MACROBLOCKD *const xd = &x->e_mbd;
const struct segmentation *const seg = &cm->seg;
const MB_MODE_INFO_EXT *const mbmi_ext = x->mbmi_ext;
const PREDICTION_MODE mode = mi->mode;
const int segment_id = mi->segment_id;
const BLOCK_SIZE bsize = mi->sb_type;
const int allow_hp = cm->allow_high_precision_mv;
const int is_inter = is_inter_block(mi);
const int is_compound = has_second_ref(mi);
int skip, ref;
if (seg->update_map) {
if (seg->temporal_update) {
const int pred_flag = mi->seg_id_predicted;
vpx_prob pred_prob = vp9_get_pred_prob_seg_id(seg, xd);
vpx_write(w, pred_flag, pred_prob);
if (!pred_flag)
write_segment_id(w, seg, segment_id);
} else {
write_segment_id(w, seg, segment_id);
}
}
skip = write_skip(cm, xd, segment_id, mi, w);
if (!segfeature_active(seg, segment_id, SEG_LVL_REF_FRAME))
vpx_write(w, is_inter, vp9_get_intra_inter_prob(cm, xd));
if (bsize >= BLOCK_8X8 && cm->tx_mode == TX_MODE_SELECT &&
!(is_inter && skip)) {
write_selected_tx_size(cm, xd, w);
}
if (!is_inter) {
if (bsize >= BLOCK_8X8) {
write_intra_mode(w, mode, cm->fc->y_mode_prob[size_group_lookup[bsize]]);
} else {
int idx, idy;
const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
const PREDICTION_MODE b_mode = mi->bmi[idy * 2 + idx].as_mode;
write_intra_mode(w, b_mode, cm->fc->y_mode_prob[0]);
}
}
}
write_intra_mode(w, mi->uv_mode, cm->fc->uv_mode_prob[mode]);
} else {
const int mode_ctx = mbmi_ext->mode_context[mi->ref_frame[0]];
const vpx_prob *const inter_probs = cm->fc->inter_mode_probs[mode_ctx];
write_ref_frames(cm, xd, w);
// If segment skip is not enabled code the mode.
if (!segfeature_active(seg, segment_id, SEG_LVL_SKIP)) {
if (bsize >= BLOCK_8X8) {
write_inter_mode(w, mode, inter_probs);
}
}
if (cm->interp_filter == SWITCHABLE) {
const int ctx = vp9_get_pred_context_switchable_interp(xd);
vp9_write_token(w, vp9_switchable_interp_tree,
cm->fc->switchable_interp_prob[ctx],
&switchable_interp_encodings[mi->interp_filter]);
++cpi->interp_filter_selected[0][mi->interp_filter];
} else {
assert(mi->interp_filter == cm->interp_filter);
}
if (bsize < BLOCK_8X8) {
const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
int idx, idy;
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
const int j = idy * 2 + idx;
const PREDICTION_MODE b_mode = mi->bmi[j].as_mode;
write_inter_mode(w, b_mode, inter_probs);
if (b_mode == NEWMV) {
for (ref = 0; ref < 1 + is_compound; ++ref)
vp9_encode_mv(cpi, w, &mi->bmi[j].as_mv[ref].as_mv,
&mbmi_ext->ref_mvs[mi->ref_frame[ref]][0].as_mv,
nmvc, allow_hp);
}
}
}
} else {
if (mode == NEWMV) {
for (ref = 0; ref < 1 + is_compound; ++ref)
vp9_encode_mv(cpi, w, &mi->mv[ref].as_mv,
&mbmi_ext->ref_mvs[mi->ref_frame[ref]][0].as_mv, nmvc,
allow_hp);
}
}
}
}
static void read_inter_block_mode_info(VP9Decoder *const pbi,
MACROBLOCKD *const xd,
const TileInfo *const tile,
MODE_INFO *const mi,
int mi_row, int mi_col, vp9_reader *r) {
VP9_COMMON *const cm = &pbi->common;
MB_MODE_INFO *const mbmi = &mi->mbmi;
const BLOCK_SIZE bsize = mbmi->sb_type;
const int allow_hp = cm->allow_high_precision_mv;
int_mv nearestmv[2], nearmv[2];
int inter_mode_ctx, ref, is_compound;
read_ref_frames(cm, xd, r, mbmi->segment_id, mbmi->ref_frame);
is_compound = has_second_ref(mbmi);
for (ref = 0; ref < 1 + is_compound; ++ref) {
const MV_REFERENCE_FRAME frame = mbmi->ref_frame[ref];
RefBuffer *ref_buf = &cm->frame_refs[frame - LAST_FRAME];
xd->block_refs[ref] = ref_buf;
if ((!vp9_is_valid_scale(&ref_buf->sf)))
vpx_internal_error(xd->error_info, VPX_CODEC_UNSUP_BITSTREAM,
"Reference frame has invalid dimensions");
vp9_setup_pre_planes(xd, ref, ref_buf->buf, mi_row, mi_col,
&ref_buf->sf);
vp9_find_mv_refs(cm, xd, tile, mi, frame, mbmi->ref_mvs[frame],
mi_row, mi_col, fpm_sync, (void *)pbi);
}
inter_mode_ctx = mbmi->mode_context[mbmi->ref_frame[0]];
if (vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
mbmi->mode = ZEROMV;
if (bsize < BLOCK_8X8) {
vpx_internal_error(xd->error_info, VPX_CODEC_UNSUP_BITSTREAM,
"Invalid usage of segement feature on small blocks");
return;
}
} else {
if (bsize >= BLOCK_8X8)
mbmi->mode = read_inter_mode(cm, xd, r, inter_mode_ctx);
}
if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
for (ref = 0; ref < 1 + is_compound; ++ref) {
vp9_find_best_ref_mvs(xd, allow_hp, mbmi->ref_mvs[mbmi->ref_frame[ref]],
&nearestmv[ref], &nearmv[ref]);
}
}
mbmi->interp_filter = (cm->interp_filter == SWITCHABLE)
? read_switchable_interp_filter(cm, xd, r)
: cm->interp_filter;
if (bsize < BLOCK_8X8) {
const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
int idx, idy;
PREDICTION_MODE b_mode;
int_mv nearest_sub8x8[2], near_sub8x8[2];
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
int_mv block[2];
const int j = idy * 2 + idx;
b_mode = read_inter_mode(cm, xd, r, inter_mode_ctx);
if (b_mode == NEARESTMV || b_mode == NEARMV)
for (ref = 0; ref < 1 + is_compound; ++ref)
vp9_append_sub8x8_mvs_for_idx(cm, xd, tile, j, ref, mi_row, mi_col,
&nearest_sub8x8[ref],
&near_sub8x8[ref]);
if (!assign_mv(cm, xd, b_mode, block, nearestmv,
nearest_sub8x8, near_sub8x8,
is_compound, allow_hp, r)) {
xd->corrupted |= 1;
break;
};
mi->bmi[j].as_mv[0].as_int = block[0].as_int;
if (is_compound)
mi->bmi[j].as_mv[1].as_int = block[1].as_int;
if (num_4x4_h == 2)
mi->bmi[j + 2] = mi->bmi[j];
if (num_4x4_w == 2)
mi->bmi[j + 1] = mi->bmi[j];
}
}
mi->mbmi.mode = b_mode;
mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
} else {
xd->corrupted |= !assign_mv(cm, xd, mbmi->mode, mbmi->mv, nearestmv,
nearestmv, nearmv, is_compound, allow_hp, r);
}
}
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;
}
// 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 MODE_INFO *const above_mi = xd->above_mi;
const MODE_INFO *const left_mi = xd->left_mi;
const int above_in_image = !!above_mi;
const int left_in_image = !!left_mi;
// Note:
// 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.
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_mi);
const int left_intra = !is_inter_block(left_mi);
if (above_intra && left_intra) { // intra/intra (2)
pred_context = 2;
} else if (above_intra || left_intra) { // intra/inter
const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
if (!has_second_ref(edge_mi)) // single pred (1/3)
pred_context = 1 + 2 * (edge_mi->ref_frame[0] != cm->comp_var_ref[1]);
else // comp pred (1/3)
pred_context =
1 + 2 * (edge_mi->ref_frame[var_ref_idx] != cm->comp_var_ref[1]);
} else { // inter/inter
const int l_sg = !has_second_ref(left_mi);
const int a_sg = !has_second_ref(above_mi);
const MV_REFERENCE_FRAME vrfa =
a_sg ? above_mi->ref_frame[0] : above_mi->ref_frame[var_ref_idx];
const MV_REFERENCE_FRAME vrfl =
l_sg ? left_mi->ref_frame[0] : left_mi->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 MODE_INFO *edge_mi = above_in_image ? above_mi : left_mi;
if (!is_inter_block(edge_mi)) {
pred_context = 2;
} else {
if (has_second_ref(edge_mi))
pred_context =
4 * (edge_mi->ref_frame[var_ref_idx] != cm->comp_var_ref[1]);
else
pred_context = 3 * (edge_mi->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;
}
int vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) {
int pred_context;
const MODE_INFO *const above_mi = xd->above_mi;
const MODE_INFO *const left_mi = xd->left_mi;
const int has_above = !!above_mi;
const int has_left = !!left_mi;
// Note:
// 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.
if (has_above && has_left) { // both edges available
const int above_intra = !is_inter_block(above_mi);
const int left_intra = !is_inter_block(left_mi);
if (above_intra && left_intra) { // intra/intra
pred_context = 2;
} else if (above_intra || left_intra) { // intra/inter or inter/intra
const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
if (!has_second_ref(edge_mi)) {
if (edge_mi->ref_frame[0] == LAST_FRAME)
pred_context = 3;
else
pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME);
} else {
pred_context = 1 +
2 * (edge_mi->ref_frame[0] == GOLDEN_FRAME ||
edge_mi->ref_frame[1] == GOLDEN_FRAME);
}
} else { // inter/inter
const int above_has_second = has_second_ref(above_mi);
const int left_has_second = has_second_ref(left_mi);
const MV_REFERENCE_FRAME above0 = above_mi->ref_frame[0];
const MV_REFERENCE_FRAME above1 = above_mi->ref_frame[1];
const MV_REFERENCE_FRAME left0 = left_mi->ref_frame[0];
const MV_REFERENCE_FRAME left1 = left_mi->ref_frame[1];
if (above_has_second && left_has_second) {
if (above0 == left0 && above1 == left1)
pred_context =
3 * (above0 == GOLDEN_FRAME || above1 == GOLDEN_FRAME ||
left0 == GOLDEN_FRAME || left1 == GOLDEN_FRAME);
else
pred_context = 2;
} else if (above_has_second || left_has_second) {
const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0;
const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0;
const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1;
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 (above0 == LAST_FRAME && left0 == LAST_FRAME) {
pred_context = 3;
} else if (above0 == LAST_FRAME || left0 == LAST_FRAME) {
const MV_REFERENCE_FRAME edge0 =
(above0 == LAST_FRAME) ? left0 : above0;
pred_context = 4 * (edge0 == GOLDEN_FRAME);
} else {
pred_context =
2 * (above0 == GOLDEN_FRAME) + 2 * (left0 == GOLDEN_FRAME);
}
}
}
} else if (has_above || has_left) { // one edge available
const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
if (!is_inter_block(edge_mi) ||
(edge_mi->ref_frame[0] == LAST_FRAME && !has_second_ref(edge_mi)))
pred_context = 2;
else if (!has_second_ref(edge_mi))
pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME);
else
pred_context = 3 * (edge_mi->ref_frame[0] == GOLDEN_FRAME ||
edge_mi->ref_frame[1] == GOLDEN_FRAME);
} else { // no edges available (2)
pred_context = 2;
}
assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
return pred_context;
}
int vp9_get_pred_context_single_ref_p1(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))
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
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) {
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 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 == LAST_FRAME)
pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
else
pred_context = (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
} else {
pred_context = 2 * (above_mbmi->ref_frame[0] == LAST_FRAME) +
2 * (left_mbmi->ref_frame[0] == LAST_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)) { // 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;
}
