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Diffstat (limited to 'third_party/aom/av1/common/pred_common.c')
| -rw-r--r-- | third_party/aom/av1/common/pred_common.c | 1408 |
1 files changed, 1408 insertions, 0 deletions
diff --git a/third_party/aom/av1/common/pred_common.c b/third_party/aom/av1/common/pred_common.c new file mode 100644 index 000000000..905dd3afe --- /dev/null +++ b/third_party/aom/av1/common/pred_common.c @@ -0,0 +1,1408 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +#include "av1/common/common.h" +#include "av1/common/pred_common.h" +#include "av1/common/reconinter.h" +#if CONFIG_EXT_INTRA +#include "av1/common/reconintra.h" +#endif // CONFIG_EXT_INTRA +#include "av1/common/seg_common.h" + +// Returns a context number for the given MB prediction signal +#if CONFIG_DUAL_FILTER +static InterpFilter get_ref_filter_type(const MODE_INFO *mi, + const MACROBLOCKD *xd, int dir, + MV_REFERENCE_FRAME ref_frame) { + InterpFilter ref_type = SWITCHABLE_FILTERS; + const MB_MODE_INFO *ref_mbmi = &mi->mbmi; + int use_subpel[2] = { + has_subpel_mv_component(mi, xd, dir), + has_subpel_mv_component(mi, xd, dir + 2), + }; + + if (ref_mbmi->ref_frame[0] == ref_frame && use_subpel[0]) + ref_type = ref_mbmi->interp_filter[(dir & 0x01)]; + else if (ref_mbmi->ref_frame[1] == ref_frame && use_subpel[1]) + ref_type = ref_mbmi->interp_filter[(dir & 0x01) + 2]; + + return ref_type; +} + +int av1_get_pred_context_switchable_interp(const MACROBLOCKD *xd, int dir) { + const MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi; + const int ctx_offset = + (mbmi->ref_frame[1] > INTRA_FRAME) * INTER_FILTER_COMP_OFFSET; + MV_REFERENCE_FRAME ref_frame = + (dir < 2) ? mbmi->ref_frame[0] : mbmi->ref_frame[1]; + // 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. + int filter_type_ctx = ctx_offset + (dir & 0x01) * INTER_FILTER_DIR_OFFSET; + int left_type = SWITCHABLE_FILTERS; + int above_type = SWITCHABLE_FILTERS; + + if (xd->left_available) + left_type = get_ref_filter_type(xd->mi[-1], xd, dir, ref_frame); + + if (xd->up_available) + above_type = + get_ref_filter_type(xd->mi[-xd->mi_stride], xd, dir, ref_frame); + + if (left_type == above_type) { + filter_type_ctx += left_type; + } else if (left_type == SWITCHABLE_FILTERS) { + assert(above_type != SWITCHABLE_FILTERS); + filter_type_ctx += above_type; + } else if (above_type == SWITCHABLE_FILTERS) { + assert(left_type != SWITCHABLE_FILTERS); + filter_type_ctx += left_type; + } else { + filter_type_ctx += SWITCHABLE_FILTERS; + } + + return filter_type_ctx; +} +#else +int av1_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 corresponding to real macroblocks. + // The prediction flags in these dummy entries are initialized to 0. + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int left_type = xd->left_available && is_inter_block(left_mbmi) + ? left_mbmi->interp_filter + : SWITCHABLE_FILTERS; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const int above_type = xd->up_available && 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) { + assert(above_type != SWITCHABLE_FILTERS); + return above_type; + } else if (above_type == SWITCHABLE_FILTERS) { + assert(left_type != SWITCHABLE_FILTERS); + return left_type; + } else { + return SWITCHABLE_FILTERS; + } +} +#endif + +#if CONFIG_EXT_INTRA +#if CONFIG_INTRA_INTERP +// Obtain the reference filter type from the above/left neighbor blocks. +static INTRA_FILTER get_ref_intra_filter(const MB_MODE_INFO *ref_mbmi) { + INTRA_FILTER ref_type = INTRA_FILTERS; + + if (ref_mbmi->sb_type >= BLOCK_8X8) { + const PREDICTION_MODE mode = ref_mbmi->mode; + if (is_inter_block(ref_mbmi)) { +#if CONFIG_DUAL_FILTER + switch (ref_mbmi->interp_filter[0]) { +#else + switch (ref_mbmi->interp_filter) { +#endif + case EIGHTTAP_REGULAR: ref_type = INTRA_FILTER_8TAP; break; + case EIGHTTAP_SMOOTH: ref_type = INTRA_FILTER_8TAP_SMOOTH; break; + case MULTITAP_SHARP: ref_type = INTRA_FILTER_8TAP_SHARP; break; + case BILINEAR: ref_type = INTRA_FILTERS; break; + default: break; + } + } else { + if (av1_is_directional_mode(mode, ref_mbmi->sb_type)) { + const int p_angle = + mode_to_angle_map[mode] + ref_mbmi->angle_delta[0] * ANGLE_STEP; + if (av1_is_intra_filter_switchable(p_angle)) { + ref_type = ref_mbmi->intra_filter; + } + } + } + } + return ref_type; +} + +int av1_get_pred_context_intra_interp(const MACROBLOCKD *xd) { + int left_type = INTRA_FILTERS, above_type = INTRA_FILTERS; + + if (xd->left_available) left_type = get_ref_intra_filter(xd->left_mbmi); + + if (xd->up_available) above_type = get_ref_intra_filter(xd->above_mbmi); + + if (left_type == above_type) + return left_type; + else if (left_type == INTRA_FILTERS && above_type != INTRA_FILTERS) + return above_type; + else if (left_type != INTRA_FILTERS && above_type == INTRA_FILTERS) + return left_type; + else + return INTRA_FILTERS; +} +#endif // CONFIG_INTRA_INTERP +#endif // CONFIG_EXT_INTRA + +// 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 av1_get_intra_inter_context(const MACROBLOCKD *xd) { + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + 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; + } +} + +#if CONFIG_EXT_INTER && CONFIG_COMPOUND_SINGLEREF +// The compound/single mode info data structure has 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 - single/single +// 1 - single/--, --/single, --/-- +// 2 - single/comp, comp/single +// 3 - comp/comp, comp/--, --/comp +int av1_get_inter_mode_context(const MACROBLOCKD *xd) { + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + if (has_above && has_left) { // both edges available (0/2/3) + const int above_inter_comp_mode = is_inter_compound_mode(above_mbmi->mode); + const int left_inter_comp_mode = is_inter_compound_mode(left_mbmi->mode); + return (above_inter_comp_mode && left_inter_comp_mode) + ? 3 + : (above_inter_comp_mode || left_inter_comp_mode) * 2; + } else if (has_above || has_left) { // one edge available (1/3) + const MB_MODE_INFO *const edge_mbmi = has_above ? above_mbmi : left_mbmi; + return is_inter_compound_mode(edge_mbmi->mode) ? 3 : 1; + } else { // no edge available (1) + return 1; + } +} +#endif // CONFIG_EXT_INTER && CONFIG_COMPOUND_SINGLEREF + +#if CONFIG_EXT_REFS +#define CHECK_BACKWARD_REFS(ref_frame) \ + (((ref_frame) >= BWDREF_FRAME) && ((ref_frame) <= ALTREF_FRAME)) +#define IS_BACKWARD_REF_FRAME(ref_frame) CHECK_BACKWARD_REFS(ref_frame) +#else +#define IS_BACKWARD_REF_FRAME(ref_frame) ((ref_frame) == cm->comp_fixed_ref) +#endif // CONFIG_EXT_REFS + +int av1_get_reference_mode_context(const AV1_COMMON *cm, + const MACROBLOCKD *xd) { + int ctx; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + +#if CONFIG_EXT_REFS + (void)cm; +#endif // CONFIG_EXT_REFS + + // 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_mbmi) && !has_second_ref(left_mbmi)) + // neither edge uses comp pred (0/1) + ctx = IS_BACKWARD_REF_FRAME(above_mbmi->ref_frame[0]) ^ + IS_BACKWARD_REF_FRAME(left_mbmi->ref_frame[0]); + else if (!has_second_ref(above_mbmi)) + // one of two edges uses comp pred (2/3) + ctx = 2 + (IS_BACKWARD_REF_FRAME(above_mbmi->ref_frame[0]) || + !is_inter_block(above_mbmi)); + else if (!has_second_ref(left_mbmi)) + // one of two edges uses comp pred (2/3) + ctx = 2 + (IS_BACKWARD_REF_FRAME(left_mbmi->ref_frame[0]) || + !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 = IS_BACKWARD_REF_FRAME(edge_mbmi->ref_frame[0]); + else + // edge uses comp pred (3) + ctx = 3; + } else { // no edges available (1) + ctx = 1; + } + assert(ctx >= 0 && ctx < COMP_INTER_CONTEXTS); + return ctx; +} + +#if CONFIG_EXT_REFS + +// TODO(zoeliu): Future work will be conducted to optimize the context design +// for the coding of the reference frames. + +#define CHECK_LAST_OR_LAST2(ref_frame) \ + ((ref_frame == LAST_FRAME) || (ref_frame == LAST2_FRAME)) + +#define CHECK_GOLDEN_OR_LAST3(ref_frame) \ + ((ref_frame == GOLDEN_FRAME) || (ref_frame == LAST3_FRAME)) + +// Returns a context number for the given MB prediction signal +// Signal the first reference frame for a compound mode be either +// GOLDEN/LAST3, or LAST/LAST2. +// +// NOTE(zoeliu): The probability of ref_frame[0] is either +// GOLDEN_FRAME or LAST3_FRAME. +#if CONFIG_LOWDELAY_COMPOUND +int av1_get_pred_context_comp_ref_p(UNUSED const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#else +int av1_get_pred_context_comp_ref_p(const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#endif + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int above_in_image = xd->up_available; + const int left_in_image = xd->left_available; + +// 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 CONFIG_LOWDELAY_COMPOUND // No change to bitstream + // Code seems to assume that signbias of cm->comp_bwd_ref[0] is always 1 + const int bwd_ref_sign_idx = 1; +#else + const int bwd_ref_sign_idx = cm->ref_frame_sign_bias[cm->comp_bwd_ref[0]]; +#endif + const int fwd_ref_sign_idx = !bwd_ref_sign_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 * (!CHECK_GOLDEN_OR_LAST3(edge_mbmi->ref_frame[0])); + else // comp pred (1/3) + pred_context = 1 + + 2 * (!CHECK_GOLDEN_OR_LAST3( + edge_mbmi->ref_frame[fwd_ref_sign_idx])); + } 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 frfa = + a_sg ? above_mbmi->ref_frame[0] + : above_mbmi->ref_frame[fwd_ref_sign_idx]; + const MV_REFERENCE_FRAME frfl = + l_sg ? left_mbmi->ref_frame[0] + : left_mbmi->ref_frame[fwd_ref_sign_idx]; + + if (frfa == frfl && CHECK_GOLDEN_OR_LAST3(frfa)) { + pred_context = 0; + } else if (l_sg && a_sg) { // single/single + if ((CHECK_BACKWARD_REFS(frfa) && CHECK_LAST_OR_LAST2(frfl)) || + (CHECK_BACKWARD_REFS(frfl) && CHECK_LAST_OR_LAST2(frfa))) { + pred_context = 4; + } else if (CHECK_GOLDEN_OR_LAST3(frfa) || CHECK_GOLDEN_OR_LAST3(frfl)) { + pred_context = 1; + } else { + pred_context = 3; + } + } else if (l_sg || a_sg) { // single/comp + const MV_REFERENCE_FRAME frfc = l_sg ? frfa : frfl; + const MV_REFERENCE_FRAME rfs = a_sg ? frfa : frfl; + + if (CHECK_GOLDEN_OR_LAST3(frfc) && !CHECK_GOLDEN_OR_LAST3(rfs)) + pred_context = 1; + else if (CHECK_GOLDEN_OR_LAST3(rfs) && !CHECK_GOLDEN_OR_LAST3(frfc)) + pred_context = 2; + else + pred_context = 4; + } else { // comp/comp + if ((CHECK_LAST_OR_LAST2(frfa) && CHECK_LAST_OR_LAST2(frfl))) { + pred_context = 4; + } else { + // NOTE(zoeliu): Following assert may be removed once confirmed. + assert(CHECK_GOLDEN_OR_LAST3(frfa) || CHECK_GOLDEN_OR_LAST3(frfl)); + 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 * + (!CHECK_GOLDEN_OR_LAST3(edge_mbmi->ref_frame[fwd_ref_sign_idx])); + else + pred_context = 3 * (!CHECK_GOLDEN_OR_LAST3(edge_mbmi->ref_frame[0])); + } + } 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 +// Signal the first reference frame for a compound mode be LAST, +// conditioning on that it is known either LAST/LAST2. +// +// NOTE(zoeliu): The probability of ref_frame[0] is LAST_FRAME, +// conditioning on it is either LAST_FRAME or LAST2_FRAME. +#if CONFIG_LOWDELAY_COMPOUND +int av1_get_pred_context_comp_ref_p1(UNUSED const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#else +int av1_get_pred_context_comp_ref_p1(const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#endif + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int above_in_image = xd->up_available; + const int left_in_image = xd->left_available; + +// 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 CONFIG_LOWDELAY_COMPOUND // No change to bitstream + // Code seems to assume that signbias of cm->comp_bwd_ref[0] is always 1 + const int bwd_ref_sign_idx = 1; +#else + const int bwd_ref_sign_idx = cm->ref_frame_sign_bias[cm->comp_bwd_ref[0]]; +#endif + const int fwd_ref_sign_idx = !bwd_ref_sign_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] != LAST_FRAME); + else // comp pred (1/3) + pred_context = + 1 + 2 * (edge_mbmi->ref_frame[fwd_ref_sign_idx] != LAST_FRAME); + } 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 frfa = + a_sg ? above_mbmi->ref_frame[0] + : above_mbmi->ref_frame[fwd_ref_sign_idx]; + const MV_REFERENCE_FRAME frfl = + l_sg ? left_mbmi->ref_frame[0] + : left_mbmi->ref_frame[fwd_ref_sign_idx]; + + if (frfa == frfl && frfa == LAST_FRAME) + pred_context = 0; + else if (l_sg && a_sg) { // single/single + if (frfa == LAST_FRAME || frfl == LAST_FRAME) + pred_context = 1; + else if (CHECK_GOLDEN_OR_LAST3(frfa) || CHECK_GOLDEN_OR_LAST3(frfl)) + pred_context = 2 + (frfa != frfl); + else if (frfa == frfl || + (CHECK_BACKWARD_REFS(frfa) && CHECK_BACKWARD_REFS(frfl))) + pred_context = 3; + else + pred_context = 4; + } else if (l_sg || a_sg) { // single/comp + const MV_REFERENCE_FRAME frfc = l_sg ? frfa : frfl; + const MV_REFERENCE_FRAME rfs = a_sg ? frfa : frfl; + + if (frfc == LAST_FRAME && rfs != LAST_FRAME) + pred_context = 1; + else if (rfs == LAST_FRAME && frfc != LAST_FRAME) + pred_context = 2; + else + pred_context = + 3 + (frfc == LAST2_FRAME || CHECK_GOLDEN_OR_LAST3(rfs)); + } else { // comp/comp + if (frfa == LAST_FRAME || frfl == LAST_FRAME) + pred_context = 2; + else + pred_context = + 3 + (CHECK_GOLDEN_OR_LAST3(frfa) || CHECK_GOLDEN_OR_LAST3(frfl)); + } + } + } 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[fwd_ref_sign_idx] != LAST_FRAME); + } else { + if (edge_mbmi->ref_frame[0] == LAST_FRAME) + pred_context = 0; + else + pred_context = 2 + CHECK_GOLDEN_OR_LAST3(edge_mbmi->ref_frame[0]); + } + } + } 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 +// Signal the first reference frame for a compound mode be GOLDEN, +// conditioning on that it is known either GOLDEN or LAST3. +// +// NOTE(zoeliu): The probability of ref_frame[0] is GOLDEN_FRAME, +// conditioning on it is either GOLDEN or LAST3. +#if CONFIG_LOWDELAY_COMPOUND +int av1_get_pred_context_comp_ref_p2(UNUSED const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#else +int av1_get_pred_context_comp_ref_p2(const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#endif + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int above_in_image = xd->up_available; + const int left_in_image = xd->left_available; + +// 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 CONFIG_LOWDELAY_COMPOUND // No change to bitstream + // Code seems to assume that signbias of cm->comp_bwd_ref[0] is always 1 + const int bwd_ref_sign_idx = 1; +#else + const int bwd_ref_sign_idx = cm->ref_frame_sign_bias[cm->comp_bwd_ref[0]]; +#endif + const int fwd_ref_sign_idx = !bwd_ref_sign_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] != GOLDEN_FRAME); + else // comp pred (1/3) + pred_context = + 1 + 2 * (edge_mbmi->ref_frame[fwd_ref_sign_idx] != GOLDEN_FRAME); + } 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 frfa = + a_sg ? above_mbmi->ref_frame[0] + : above_mbmi->ref_frame[fwd_ref_sign_idx]; + const MV_REFERENCE_FRAME frfl = + l_sg ? left_mbmi->ref_frame[0] + : left_mbmi->ref_frame[fwd_ref_sign_idx]; + + if (frfa == frfl && frfa == GOLDEN_FRAME) + pred_context = 0; + else if (l_sg && a_sg) { // single/single + if (frfa == GOLDEN_FRAME || frfl == GOLDEN_FRAME) + pred_context = 1; + else if (CHECK_LAST_OR_LAST2(frfa) || CHECK_LAST_OR_LAST2(frfl)) + pred_context = 2 + (frfa != frfl); + else if (frfa == frfl || + (CHECK_BACKWARD_REFS(frfa) && CHECK_BACKWARD_REFS(frfl))) + pred_context = 3; + else + pred_context = 4; + } else if (l_sg || a_sg) { // single/comp + const MV_REFERENCE_FRAME frfc = l_sg ? frfa : frfl; + const MV_REFERENCE_FRAME rfs = a_sg ? frfa : frfl; + + if (frfc == GOLDEN_FRAME && rfs != GOLDEN_FRAME) + pred_context = 1; + else if (rfs == GOLDEN_FRAME && frfc != GOLDEN_FRAME) + pred_context = 2; + else + pred_context = 3 + (frfc == LAST3_FRAME || CHECK_LAST_OR_LAST2(rfs)); + } else { // comp/comp + if (frfa == GOLDEN_FRAME || frfl == GOLDEN_FRAME) + pred_context = 2; + else + pred_context = + 3 + (CHECK_LAST_OR_LAST2(frfa) || CHECK_LAST_OR_LAST2(frfl)); + } + } + } 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[fwd_ref_sign_idx] != GOLDEN_FRAME); + } else { + if (edge_mbmi->ref_frame[0] == GOLDEN_FRAME) + pred_context = 0; + else + pred_context = 2 + CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[0]); + } + } + } 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 +#if CONFIG_LOWDELAY_COMPOUND +int av1_get_pred_context_comp_bwdref_p(UNUSED const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#else +int av1_get_pred_context_comp_bwdref_p(const AV1_COMMON *cm, + const MACROBLOCKD *xd) { +#endif + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int above_in_image = xd->up_available; + const int left_in_image = xd->left_available; + +// 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 CONFIG_LOWDELAY_COMPOUND // No change to bitstream + // Code seems to assume that signbias of cm->comp_bwd_ref[0] is always 1 + const int bwd_ref_sign_idx = 1; +#else + const int bwd_ref_sign_idx = cm->ref_frame_sign_bias[cm->comp_bwd_ref[0]]; +#endif + const int fwd_ref_sign_idx = !bwd_ref_sign_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_bwd_ref[1]); + else // comp pred (1/3) + pred_context = + 1 + + 2 * (edge_mbmi->ref_frame[bwd_ref_sign_idx] != cm->comp_bwd_ref[1]); + } else { // inter/inter + const int l_comp = has_second_ref(left_mbmi); + const int a_comp = has_second_ref(above_mbmi); + + const MV_REFERENCE_FRAME l_brf = + l_comp ? left_mbmi->ref_frame[bwd_ref_sign_idx] : NONE_FRAME; + const MV_REFERENCE_FRAME a_brf = + a_comp ? above_mbmi->ref_frame[bwd_ref_sign_idx] : NONE_FRAME; + + const MV_REFERENCE_FRAME l_frf = + !l_comp ? left_mbmi->ref_frame[0] + : left_mbmi->ref_frame[fwd_ref_sign_idx]; + const MV_REFERENCE_FRAME a_frf = + !a_comp ? above_mbmi->ref_frame[0] + : above_mbmi->ref_frame[fwd_ref_sign_idx]; + + if (l_comp && a_comp) { // comp/comp + if (l_brf == a_brf && l_brf == cm->comp_bwd_ref[1]) { + pred_context = 0; + } else if (l_brf == cm->comp_bwd_ref[1] || + a_brf == cm->comp_bwd_ref[1]) { + pred_context = 1; + } else { + // NOTE: Backward ref should be either BWDREF or ALTREF. + assert(l_brf == a_brf && l_brf != cm->comp_bwd_ref[1]); + pred_context = 3; + } + } else if (!l_comp && !a_comp) { // single/single + if (l_frf == a_frf && l_frf == cm->comp_bwd_ref[1]) { + pred_context = 0; + } else if (l_frf == cm->comp_bwd_ref[1] || + a_frf == cm->comp_bwd_ref[1]) { + pred_context = 1; + } else if (l_frf == a_frf) { + pred_context = 3; + } else { + assert(l_frf != a_frf && l_frf != cm->comp_bwd_ref[1] && + a_frf != cm->comp_bwd_ref[1]); + pred_context = 4; + } + } else { // comp/single + assert((l_comp && !a_comp) || (!l_comp && a_comp)); + + if ((l_comp && l_brf == cm->comp_bwd_ref[1] && + a_frf == cm->comp_bwd_ref[1]) || + (a_comp && a_brf == cm->comp_bwd_ref[1] && + l_frf == cm->comp_bwd_ref[1])) { + pred_context = 1; + } else if ((l_comp && l_brf == cm->comp_bwd_ref[1]) || + (a_comp && a_brf == cm->comp_bwd_ref[1]) || + (!l_comp && l_frf == cm->comp_bwd_ref[1]) || + (!a_comp && a_frf == cm->comp_bwd_ref[1])) { + pred_context = 2; + } else { + 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 (!is_inter_block(edge_mbmi)) { + pred_context = 2; + } else { + if (has_second_ref(edge_mbmi)) { + pred_context = + 4 * (edge_mbmi->ref_frame[bwd_ref_sign_idx] != cm->comp_bwd_ref[1]); + } else { + pred_context = 3 * (edge_mbmi->ref_frame[0] != cm->comp_bwd_ref[1]); + } + } + } else { // no edges available (2) + pred_context = 2; + } + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + + return pred_context; +} + +#else // CONFIG_EXT_REFS + +// Returns a context number for the given MB prediction signal +int av1_get_pred_context_comp_ref_p(const AV1_COMMON *cm, + const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int above_in_image = xd->up_available; + const int left_in_image = xd->left_available; + + // 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_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; +} + +#endif // CONFIG_EXT_REFS + +#if CONFIG_EXT_REFS + +// For the bit to signal whether the single reference is a ALTREF_FRAME +// or a BWDREF_FRAME. +// +// NOTE(zoeliu): The probability of ref_frame[0] is ALTREF/BWDREF. +int av1_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + // 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)) // single + pred_context = 4 * (!CHECK_BACKWARD_REFS(edge_mbmi->ref_frame[0])); + else // comp + pred_context = 2; + } else { // inter/inter + const int above_has_second = has_second_ref(above_mbmi); + const int left_has_second = has_second_ref(left_mbmi); + + const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0]; + + if (above_has_second && left_has_second) { // comp/comp + pred_context = 2; + } else if (above_has_second || left_has_second) { // single/comp + const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0; + + pred_context = (!CHECK_BACKWARD_REFS(rfs)) ? 4 : 1; + } else { // single/single + pred_context = 2 * (!CHECK_BACKWARD_REFS(above0)) + + 2 * (!CHECK_BACKWARD_REFS(left0)); + } + } + } 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)) // single + pred_context = 4 * (!CHECK_BACKWARD_REFS(edge_mbmi->ref_frame[0])); + else // comp + pred_context = 2; + } + } else { // no edges available + pred_context = 2; + } + + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + return pred_context; +} + +// For the bit to signal whether the single reference is ALTREF_FRAME or +// BWDREF_FRAME, knowing that it shall be either of these 2 choices. +// +// NOTE(zoeliu): The probability of ref_frame[0] is ALTREF_FRAME, conditioning +// on it is either ALTREF_FRAME/BWDREF_FRAME. +int av1_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + // 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)) { // single + if (!CHECK_BACKWARD_REFS(edge_mbmi->ref_frame[0])) + pred_context = 3; + else + pred_context = 4 * (edge_mbmi->ref_frame[0] == BWDREF_FRAME); + } else { // comp + pred_context = 1 + + 2 * (edge_mbmi->ref_frame[0] == BWDREF_FRAME || + edge_mbmi->ref_frame[1] == BWDREF_FRAME); + } + } else { // inter/inter + const int above_has_second = has_second_ref(above_mbmi); + const int left_has_second = has_second_ref(left_mbmi); + const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mbmi->ref_frame[1]; + + if (above_has_second && left_has_second) { // comp/comp + if (above0 == left0 && above1 == left1) + pred_context = + 3 * (above0 == BWDREF_FRAME || above1 == BWDREF_FRAME || + left0 == BWDREF_FRAME || left1 == BWDREF_FRAME); + else + pred_context = 2; + } else if (above_has_second || left_has_second) { // single/comp + 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 == BWDREF_FRAME) + pred_context = 3 + (crf1 == BWDREF_FRAME || crf2 == BWDREF_FRAME); + else if (rfs == ALTREF_FRAME) + pred_context = (crf1 == BWDREF_FRAME || crf2 == BWDREF_FRAME); + else + pred_context = 1 + 2 * (crf1 == BWDREF_FRAME || crf2 == BWDREF_FRAME); + } else { // single/single + if (!CHECK_BACKWARD_REFS(above0) && !CHECK_BACKWARD_REFS(left0)) { + pred_context = 2 + (above0 == left0); + } else if (!CHECK_BACKWARD_REFS(above0) || + !CHECK_BACKWARD_REFS(left0)) { + const MV_REFERENCE_FRAME edge0 = + !CHECK_BACKWARD_REFS(above0) ? left0 : above0; + pred_context = 4 * (edge0 == BWDREF_FRAME); + } else { + pred_context = + 2 * (above0 == BWDREF_FRAME) + 2 * (left0 == BWDREF_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) || + (!CHECK_BACKWARD_REFS(edge_mbmi->ref_frame[0]) && + !has_second_ref(edge_mbmi))) + pred_context = 2; + else if (!has_second_ref(edge_mbmi)) // single + pred_context = 4 * (edge_mbmi->ref_frame[0] == BWDREF_FRAME); + else // comp + pred_context = 3 * (edge_mbmi->ref_frame[0] == BWDREF_FRAME || + edge_mbmi->ref_frame[1] == BWDREF_FRAME); + } else { // no edges available (2) + pred_context = 2; + } + + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + return pred_context; +} + +// For the bit to signal whether the single reference is LAST3/GOLDEN or +// LAST2/LAST, knowing that it shall be either of these 2 choices. +// +// NOTE(zoeliu): The probability of ref_frame[0] is LAST3/GOLDEN, conditioning +// on it is either LAST3/GOLDEN/LAST2/LAST. +int av1_get_pred_context_single_ref_p3(const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + // 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)) { // single + if (CHECK_BACKWARD_REFS(edge_mbmi->ref_frame[0])) + pred_context = 3; + else + pred_context = 4 * CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[0]); + } else { // comp + pred_context = 1 + + 2 * (CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[0]) || + CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[1])); + } + } else { // inter/inter + const int above_has_second = has_second_ref(above_mbmi); + const int left_has_second = has_second_ref(left_mbmi); + const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mbmi->ref_frame[1]; + + if (above_has_second && left_has_second) { // comp/comp + if (above0 == left0 && above1 == left1) + pred_context = + 3 * (CHECK_LAST_OR_LAST2(above0) || CHECK_LAST_OR_LAST2(above1) || + CHECK_LAST_OR_LAST2(left0) || CHECK_LAST_OR_LAST2(left1)); + else + pred_context = 2; + } else if (above_has_second || left_has_second) { // single/comp + 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 (CHECK_LAST_OR_LAST2(rfs)) + pred_context = + 3 + (CHECK_LAST_OR_LAST2(crf1) || CHECK_LAST_OR_LAST2(crf2)); + else if (CHECK_GOLDEN_OR_LAST3(rfs)) + pred_context = + (CHECK_LAST_OR_LAST2(crf1) || CHECK_LAST_OR_LAST2(crf2)); + else + pred_context = + 1 + 2 * (CHECK_LAST_OR_LAST2(crf1) || CHECK_LAST_OR_LAST2(crf2)); + } else { // single/single + if (CHECK_BACKWARD_REFS(above0) && CHECK_BACKWARD_REFS(left0)) { + pred_context = 2 + (above0 == left0); + } else if (CHECK_BACKWARD_REFS(above0) || CHECK_BACKWARD_REFS(left0)) { + const MV_REFERENCE_FRAME edge0 = + CHECK_BACKWARD_REFS(above0) ? left0 : above0; + pred_context = 4 * CHECK_LAST_OR_LAST2(edge0); + } else { + pred_context = + 2 * CHECK_LAST_OR_LAST2(above0) + 2 * CHECK_LAST_OR_LAST2(left0); + } + } + } + } 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) || + (CHECK_BACKWARD_REFS(edge_mbmi->ref_frame[0]) && + !has_second_ref(edge_mbmi))) + pred_context = 2; + else if (!has_second_ref(edge_mbmi)) // single + pred_context = 4 * (CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[0])); + else // comp + pred_context = 3 * (CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[0]) || + CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[1])); + } else { // no edges available (2) + pred_context = 2; + } + + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + return pred_context; +} + +// For the bit to signal whether the single reference is LAST2_FRAME or +// LAST_FRAME, knowing that it shall be either of these 2 choices. +// +// NOTE(zoeliu): The probability of ref_frame[0] is LAST2_FRAME, conditioning +// on it is either LAST2_FRAME/LAST_FRAME. +int av1_get_pred_context_single_ref_p4(const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + // 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)) { // single + if (!CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[0])) + pred_context = 3; + else + pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME); + } else { // comp + pred_context = 1 + + 2 * (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); + const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mbmi->ref_frame[1]; + + if (above_has_second && left_has_second) { // comp/comp + if (above0 == left0 && above1 == left1) + pred_context = 3 * (above0 == LAST_FRAME || above1 == LAST_FRAME || + left0 == LAST_FRAME || left1 == LAST_FRAME); + else + pred_context = 2; + } else if (above_has_second || left_has_second) { // single/comp + 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 == LAST_FRAME) + pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME); + else if (rfs == LAST2_FRAME) + pred_context = (crf1 == LAST_FRAME || crf2 == LAST_FRAME); + else + pred_context = 1 + 2 * (crf1 == LAST_FRAME || crf2 == LAST_FRAME); + } else { // single/single + if (!CHECK_LAST_OR_LAST2(above0) && !CHECK_LAST_OR_LAST2(left0)) { + pred_context = 2 + (above0 == left0); + } else if (!CHECK_LAST_OR_LAST2(above0) || + !CHECK_LAST_OR_LAST2(left0)) { + const MV_REFERENCE_FRAME edge0 = + !CHECK_LAST_OR_LAST2(above0) ? left0 : above0; + pred_context = 4 * (edge0 == LAST_FRAME); + } else { + pred_context = 2 * (above0 == LAST_FRAME) + 2 * (left0 == 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) || + (!CHECK_LAST_OR_LAST2(edge_mbmi->ref_frame[0]) && + !has_second_ref(edge_mbmi))) + pred_context = 2; + else if (!has_second_ref(edge_mbmi)) // single + pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME); + else // comp + pred_context = 3 * (edge_mbmi->ref_frame[0] == LAST_FRAME || + edge_mbmi->ref_frame[1] == LAST_FRAME); + } else { // no edges available (2) + pred_context = 2; + } + + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + return pred_context; +} + +// For the bit to signal whether the single reference is GOLDEN_FRAME or +// LAST3_FRAME, knowing that it shall be either of these 2 choices. +// +// NOTE(zoeliu): The probability of ref_frame[0] is GOLDEN_FRAME, conditioning +// on it is either GOLDEN_FRAME/LAST3_FRAME. +int av1_get_pred_context_single_ref_p5(const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + // 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)) { // single + if (!CHECK_GOLDEN_OR_LAST3(edge_mbmi->ref_frame[0])) + pred_context = 3; + else + pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST3_FRAME); + } else { // comp + pred_context = 1 + + 2 * (edge_mbmi->ref_frame[0] == LAST3_FRAME || + edge_mbmi->ref_frame[1] == LAST3_FRAME); + } + } else { // inter/inter + const int above_has_second = has_second_ref(above_mbmi); + const int left_has_second = has_second_ref(left_mbmi); + const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mbmi->ref_frame[1]; + + if (above_has_second && left_has_second) { // comp/comp + if (above0 == left0 && above1 == left1) + pred_context = 3 * (above0 == LAST3_FRAME || above1 == LAST3_FRAME || + left0 == LAST3_FRAME || left1 == LAST3_FRAME); + else + pred_context = 2; + } else if (above_has_second || left_has_second) { // single/comp + 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 == LAST3_FRAME) + pred_context = 3 + (crf1 == LAST3_FRAME || crf2 == LAST3_FRAME); + else if (rfs == GOLDEN_FRAME) + pred_context = (crf1 == LAST3_FRAME || crf2 == LAST3_FRAME); + else + pred_context = 1 + 2 * (crf1 == LAST3_FRAME || crf2 == LAST3_FRAME); + } else { // single/single + if (!CHECK_GOLDEN_OR_LAST3(above0) && !CHECK_GOLDEN_OR_LAST3(left0)) { + pred_context = 2 + (above0 == left0); + } else if (!CHECK_GOLDEN_OR_LAST3(above0) || + !CHECK_GOLDEN_OR_LAST3(left0)) { + const MV_REFERENCE_FRAME edge0 = + !CHECK_GOLDEN_OR_LAST3(above0) ? left0 : above0; + pred_context = 4 * (edge0 == LAST3_FRAME); + } else { + pred_context = + 2 * (above0 == LAST3_FRAME) + 2 * (left0 == LAST3_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) || + (!CHECK_GOLDEN_OR_LAST3(edge_mbmi->ref_frame[0]) && + !has_second_ref(edge_mbmi))) + pred_context = 2; + else if (!has_second_ref(edge_mbmi)) // single + pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST3_FRAME); + else // comp + pred_context = 3 * (edge_mbmi->ref_frame[0] == LAST3_FRAME || + edge_mbmi->ref_frame[1] == LAST3_FRAME); + } else { // no edges available (2) + pred_context = 2; + } + + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + return pred_context; +} + +#else // CONFIG_EXT_REFS + +int av1_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + // 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_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); + const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mbmi->ref_frame[1]; + + if (above_has_second && left_has_second) { + pred_context = 1 + (above0 == LAST_FRAME || above1 == LAST_FRAME || + left0 == LAST_FRAME || left1 == LAST_FRAME); + } 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 == LAST_FRAME) + pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME); + else + pred_context = (crf1 == LAST_FRAME || crf2 == LAST_FRAME); + } else { + pred_context = 2 * (above0 == LAST_FRAME) + 2 * (left0 == 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; +} + +int av1_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) { + int pred_context; + const MB_MODE_INFO *const above_mbmi = xd->above_mbmi; + const MB_MODE_INFO *const left_mbmi = xd->left_mbmi; + const int has_above = xd->up_available; + const int has_left = xd->left_available; + + // 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_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); + const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mbmi->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 != GOLDEN_FRAME && rfs != LAST_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 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; +} + +#endif // CONFIG_EXT_REFS |