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+/*
+ * Copyright © 2018, VideoLAN and dav1d authors
+ * Copyright © 2018, Two Orioles, LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DAV1D_SRC_ENV_H
+#define DAV1D_SRC_ENV_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "src/levels.h"
+#include "src/refmvs.h"
+#include "src/tables.h"
+
+typedef struct BlockContext {
+ uint8_t ALIGN(mode[32], 8);
+ uint8_t ALIGN(lcoef[32], 8);
+ uint8_t ALIGN(ccoef[2][32], 8);
+ uint8_t ALIGN(seg_pred[32], 8);
+ uint8_t ALIGN(skip[32], 8);
+ uint8_t ALIGN(skip_mode[32], 8);
+ uint8_t ALIGN(intra[32], 8);
+ uint8_t ALIGN(comp_type[32], 8);
+ int8_t ALIGN(ref[2][32], 8); // -1 means intra
+ uint8_t ALIGN(filter[2][32], 8); // 3 means unset
+ int8_t ALIGN(tx_intra[32], 8);
+ int8_t ALIGN(tx[32], 8);
+ uint8_t ALIGN(tx_lpf_y[32], 8);
+ uint8_t ALIGN(tx_lpf_uv[32], 8);
+ uint8_t ALIGN(partition[16], 8);
+ uint8_t ALIGN(uvmode[32], 8);
+ uint8_t ALIGN(pal_sz[32], 8);
+} BlockContext;
+
+static inline int get_intra_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ if (have_left) {
+ if (have_top) {
+ const int ctx = l->intra[yb4] + a->intra[xb4];
+ return ctx + (ctx == 2);
+ } else
+ return l->intra[yb4] * 2;
+ } else {
+ return have_top ? a->intra[xb4] * 2 : 0;
+ }
+}
+
+static inline int get_tx_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const TxfmInfo *const max_tx,
+ const int yb4, const int xb4)
+{
+ return (l->tx_intra[yb4] >= max_tx->lh) + (a->tx_intra[xb4] >= max_tx->lw);
+}
+
+static inline int get_partition_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const enum BlockLevel bl,
+ const int yb8, const int xb8)
+{
+ return ((a->partition[xb8] >> (4 - bl)) & 1) +
+ (((l->partition[yb8] >> (4 - bl)) & 1) << 1);
+}
+
+static inline unsigned gather_left_partition_prob(const uint16_t *const in,
+ const enum BlockLevel bl)
+{
+ unsigned out = in[PARTITION_H - 1] - in[PARTITION_H];
+ // Exploit the fact that cdfs for PARTITION_SPLIT, PARTITION_T_TOP_SPLIT,
+ // PARTITION_T_BOTTOM_SPLIT and PARTITION_T_LEFT_SPLIT are neighbors.
+ out += in[PARTITION_SPLIT - 1] - in[PARTITION_T_LEFT_SPLIT];
+ if (bl != BL_128X128)
+ out += in[PARTITION_H4 - 1] - in[PARTITION_H4];
+ return out;
+}
+
+static inline unsigned gather_top_partition_prob(const uint16_t *const in,
+ const enum BlockLevel bl)
+{
+ // Exploit the fact that cdfs for PARTITION_V, PARTITION_SPLIT and
+ // PARTITION_T_TOP_SPLIT are neighbors.
+ unsigned out = in[PARTITION_V - 1] - in[PARTITION_T_TOP_SPLIT];
+ // Exploit the facts that cdfs for PARTITION_T_LEFT_SPLIT and
+ // PARTITION_T_RIGHT_SPLIT are neighbors, the probability for
+ // PARTITION_V4 is always zero, and the probability for
+ // PARTITION_T_RIGHT_SPLIT is zero in 128x128 blocks.
+ out += in[PARTITION_T_LEFT_SPLIT - 1];
+ if (bl != BL_128X128)
+ out += in[PARTITION_V4 - 1] - in[PARTITION_T_RIGHT_SPLIT];
+ return out;
+}
+
+static inline enum TxfmType get_uv_inter_txtp(const TxfmInfo *const uvt_dim,
+ const enum TxfmType ytxtp)
+{
+ if (uvt_dim->max == TX_32X32)
+ return ytxtp == IDTX ? IDTX : DCT_DCT;
+ if (uvt_dim->min == TX_16X16 &&
+ ((1 << ytxtp) & ((1 << H_FLIPADST) | (1 << V_FLIPADST) |
+ (1 << H_ADST) | (1 << V_ADST))))
+ {
+ return DCT_DCT;
+ }
+
+ return ytxtp;
+}
+
+static inline int get_filter_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int comp, const int dir, const int ref,
+ const int yb4, const int xb4)
+{
+ const int a_filter = (a->ref[0][xb4] == ref || a->ref[1][xb4] == ref) ?
+ a->filter[dir][xb4] : DAV1D_N_SWITCHABLE_FILTERS;
+ const int l_filter = (l->ref[0][yb4] == ref || l->ref[1][yb4] == ref) ?
+ l->filter[dir][yb4] : DAV1D_N_SWITCHABLE_FILTERS;
+
+ if (a_filter == l_filter) {
+ return comp * 4 + a_filter;
+ } else if (a_filter == DAV1D_N_SWITCHABLE_FILTERS) {
+ return comp * 4 + l_filter;
+ } else if (l_filter == DAV1D_N_SWITCHABLE_FILTERS) {
+ return comp * 4 + a_filter;
+ } else {
+ return comp * 4 + DAV1D_N_SWITCHABLE_FILTERS;
+ }
+}
+
+static inline int get_comp_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ if (have_top) {
+ if (have_left) {
+ if (a->comp_type[xb4]) {
+ if (l->comp_type[yb4]) {
+ return 4;
+ } else {
+ // 4U means intra (-1) or bwd (>= 4)
+ return 2 + ((unsigned)l->ref[0][yb4] >= 4U);
+ }
+ } else if (l->comp_type[yb4]) {
+ // 4U means intra (-1) or bwd (>= 4)
+ return 2 + ((unsigned)a->ref[0][xb4] >= 4U);
+ } else {
+ return (l->ref[0][yb4] >= 4) ^ (a->ref[0][xb4] >= 4);
+ }
+ } else {
+ return a->comp_type[xb4] ? 3 : a->ref[0][xb4] >= 4;
+ }
+ } else if (have_left) {
+ return l->comp_type[yb4] ? 3 : l->ref[0][yb4] >= 4;
+ } else {
+ return 1;
+ }
+}
+
+static inline int get_comp_dir_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+#define has_uni_comp(edge, off) \
+ ((edge->ref[0][off] < 4) == (edge->ref[1][off] < 4))
+
+ if (have_top && have_left) {
+ const int a_intra = a->intra[xb4], l_intra = l->intra[yb4];
+
+ if (a_intra && l_intra) return 2;
+ if (a_intra || l_intra) {
+ const BlockContext *const edge = a_intra ? l : a;
+ const int off = a_intra ? yb4 : xb4;
+
+ if (edge->comp_type[off] == COMP_INTER_NONE) return 2;
+ return 1 + 2 * has_uni_comp(edge, off);
+ }
+
+ const int a_comp = a->comp_type[xb4] != COMP_INTER_NONE;
+ const int l_comp = l->comp_type[yb4] != COMP_INTER_NONE;
+ const int a_ref0 = a->ref[0][xb4], l_ref0 = l->ref[0][yb4];
+
+ if (!a_comp && !l_comp) {
+ return 1 + 2 * ((a_ref0 >= 4) == (l_ref0 >= 4));
+ } else if (!a_comp || !l_comp) {
+ const BlockContext *const edge = a_comp ? a : l;
+ const int off = a_comp ? xb4 : yb4;
+
+ if (!has_uni_comp(edge, off)) return 1;
+ return 3 + ((a_ref0 >= 4) == (l_ref0 >= 4));
+ } else {
+ const int a_uni = has_uni_comp(a, xb4), l_uni = has_uni_comp(l, yb4);
+
+ if (!a_uni && !l_uni) return 0;
+ if (!a_uni || !l_uni) return 2;
+ return 3 + ((a_ref0 == 4) == (l_ref0 == 4));
+ }
+ } else if (have_top || have_left) {
+ const BlockContext *const edge = have_left ? l : a;
+ const int off = have_left ? yb4 : xb4;
+
+ if (edge->intra[off]) return 2;
+ if (edge->comp_type[off] == COMP_INTER_NONE) return 2;
+ return 4 * has_uni_comp(edge, off);
+ } else {
+ return 2;
+ }
+}
+
+static inline int get_poc_diff(const int order_hint_n_bits,
+ const int poc0, const int poc1)
+{
+ if (!order_hint_n_bits) return 0;
+ const int mask = 1 << (order_hint_n_bits - 1);
+ const int diff = poc0 - poc1;
+ return (diff & (mask - 1)) - (diff & mask);
+}
+
+static inline int get_jnt_comp_ctx(const int order_hint_n_bits,
+ const unsigned poc, const unsigned ref0poc,
+ const unsigned ref1poc,
+ const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4)
+{
+ const unsigned d0 = abs(get_poc_diff(order_hint_n_bits, ref0poc, poc));
+ const unsigned d1 = abs(get_poc_diff(order_hint_n_bits, poc, ref1poc));
+ const int offset = d0 == d1;
+ const int a_ctx = a->comp_type[xb4] >= COMP_INTER_AVG ||
+ a->ref[0][xb4] == 6;
+ const int l_ctx = l->comp_type[yb4] >= COMP_INTER_AVG ||
+ l->ref[0][yb4] == 6;
+
+ return 3 * offset + a_ctx + l_ctx;
+}
+
+static inline int get_mask_comp_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4)
+{
+ const int a_ctx = a->comp_type[xb4] >= COMP_INTER_SEG ? 1 :
+ a->ref[0][xb4] == 6 ? 3 : 0;
+ const int l_ctx = l->comp_type[yb4] >= COMP_INTER_SEG ? 1 :
+ l->ref[0][yb4] == 6 ? 3 : 0;
+
+ return imin(a_ctx + l_ctx, 5);
+}
+
+#define av1_get_ref_2_ctx av1_get_bwd_ref_ctx
+#define av1_get_ref_3_ctx av1_get_fwd_ref_ctx
+#define av1_get_ref_4_ctx av1_get_fwd_ref_1_ctx
+#define av1_get_ref_5_ctx av1_get_fwd_ref_2_ctx
+#define av1_get_ref_6_ctx av1_get_bwd_ref_1_ctx
+#define av1_get_uni_p_ctx av1_get_ref_ctx
+#define av1_get_uni_p2_ctx av1_get_fwd_ref_2_ctx
+
+static inline int av1_get_ref_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ int have_top, int have_left)
+{
+ int cnt[2] = { 0 };
+
+ if (have_top && !a->intra[xb4]) {
+ cnt[a->ref[0][xb4] >= 4]++;
+ if (a->comp_type[xb4]) cnt[a->ref[1][xb4] >= 4]++;
+ }
+
+ if (have_left && !l->intra[yb4]) {
+ cnt[l->ref[0][yb4] >= 4]++;
+ if (l->comp_type[yb4]) cnt[l->ref[1][yb4] >= 4]++;
+ }
+
+ return cnt[0] == cnt[1] ? 1 : cnt[0] < cnt[1] ? 0 : 2;
+}
+
+static inline int av1_get_fwd_ref_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ int cnt[4] = { 0 };
+
+ if (have_top && !a->intra[xb4]) {
+ if (a->ref[0][xb4] < 4) cnt[a->ref[0][xb4]]++;
+ if (a->comp_type[xb4] && a->ref[1][xb4] < 4) cnt[a->ref[1][xb4]]++;
+ }
+
+ if (have_left && !l->intra[yb4]) {
+ if (l->ref[0][yb4] < 4) cnt[l->ref[0][yb4]]++;
+ if (l->comp_type[yb4] && l->ref[1][yb4] < 4) cnt[l->ref[1][yb4]]++;
+ }
+
+ cnt[0] += cnt[1];
+ cnt[2] += cnt[3];
+
+ return cnt[0] == cnt[2] ? 1 : cnt[0] < cnt[2] ? 0 : 2;
+}
+
+static inline int av1_get_fwd_ref_1_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ int cnt[2] = { 0 };
+
+ if (have_top && !a->intra[xb4]) {
+ if (a->ref[0][xb4] < 2) cnt[a->ref[0][xb4]]++;
+ if (a->comp_type[xb4] && a->ref[1][xb4] < 2) cnt[a->ref[1][xb4]]++;
+ }
+
+ if (have_left && !l->intra[yb4]) {
+ if (l->ref[0][yb4] < 2) cnt[l->ref[0][yb4]]++;
+ if (l->comp_type[yb4] && l->ref[1][yb4] < 2) cnt[l->ref[1][yb4]]++;
+ }
+
+ return cnt[0] == cnt[1] ? 1 : cnt[0] < cnt[1] ? 0 : 2;
+}
+
+static inline int av1_get_fwd_ref_2_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ int cnt[2] = { 0 };
+
+ if (have_top && !a->intra[xb4]) {
+ if ((a->ref[0][xb4] ^ 2U) < 2) cnt[a->ref[0][xb4] - 2]++;
+ if (a->comp_type[xb4] && (a->ref[1][xb4] ^ 2U) < 2) cnt[a->ref[1][xb4] - 2]++;
+ }
+
+ if (have_left && !l->intra[yb4]) {
+ if ((l->ref[0][yb4] ^ 2U) < 2) cnt[l->ref[0][yb4] - 2]++;
+ if (l->comp_type[yb4] && (l->ref[1][yb4] ^ 2U) < 2) cnt[l->ref[1][yb4] - 2]++;
+ }
+
+ return cnt[0] == cnt[1] ? 1 : cnt[0] < cnt[1] ? 0 : 2;
+}
+
+static inline int av1_get_bwd_ref_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ int cnt[3] = { 0 };
+
+ if (have_top && !a->intra[xb4]) {
+ if (a->ref[0][xb4] >= 4) cnt[a->ref[0][xb4] - 4]++;
+ if (a->comp_type[xb4] && a->ref[1][xb4] >= 4) cnt[a->ref[1][xb4] - 4]++;
+ }
+
+ if (have_left && !l->intra[yb4]) {
+ if (l->ref[0][yb4] >= 4) cnt[l->ref[0][yb4] - 4]++;
+ if (l->comp_type[yb4] && l->ref[1][yb4] >= 4) cnt[l->ref[1][yb4] - 4]++;
+ }
+
+ cnt[1] += cnt[0];
+
+ return cnt[2] == cnt[1] ? 1 : cnt[1] < cnt[2] ? 0 : 2;
+}
+
+static inline int av1_get_bwd_ref_1_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ int cnt[3] = { 0 };
+
+ if (have_top && !a->intra[xb4]) {
+ if (a->ref[0][xb4] >= 4) cnt[a->ref[0][xb4] - 4]++;
+ if (a->comp_type[xb4] && a->ref[1][xb4] >= 4) cnt[a->ref[1][xb4] - 4]++;
+ }
+
+ if (have_left && !l->intra[yb4]) {
+ if (l->ref[0][yb4] >= 4) cnt[l->ref[0][yb4] - 4]++;
+ if (l->comp_type[yb4] && l->ref[1][yb4] >= 4) cnt[l->ref[1][yb4] - 4]++;
+ }
+
+ return cnt[0] == cnt[1] ? 1 : cnt[0] < cnt[1] ? 0 : 2;
+}
+
+static inline int av1_get_uni_p1_ctx(const BlockContext *const a,
+ const BlockContext *const l,
+ const int yb4, const int xb4,
+ const int have_top, const int have_left)
+{
+ int cnt[3] = { 0 };
+
+ if (have_top && !a->intra[xb4]) {
+ if (a->ref[0][xb4] - 1U < 3) cnt[a->ref[0][xb4] - 1]++;
+ if (a->comp_type[xb4] && a->ref[1][xb4] - 1U < 3) cnt[a->ref[1][xb4] - 1]++;
+ }
+
+ if (have_left && !l->intra[yb4]) {
+ if (l->ref[0][yb4] - 1U < 3) cnt[l->ref[0][yb4] - 1]++;
+ if (l->comp_type[yb4] && l->ref[1][yb4] - 1U < 3) cnt[l->ref[1][yb4] - 1]++;
+ }
+
+ cnt[1] += cnt[2];
+
+ return cnt[0] == cnt[1] ? 1 : cnt[0] < cnt[1] ? 0 : 2;
+}
+
+static inline int get_drl_context(const refmvs_candidate *const ref_mv_stack,
+ const int ref_idx)
+{
+ if (ref_mv_stack[ref_idx].weight >= 640)
+ return ref_mv_stack[ref_idx + 1].weight < 640;
+
+ return ref_mv_stack[ref_idx + 1].weight < 640 ? 2 : 0;
+}
+
+static inline unsigned get_cur_frame_segid(const int by, const int bx,
+ const int have_top,
+ const int have_left,
+ int *const seg_ctx,
+ const uint8_t *cur_seg_map,
+ const ptrdiff_t stride)
+{
+ cur_seg_map += bx + by * stride;
+ if (have_left && have_top) {
+ const int l = cur_seg_map[-1];
+ const int a = cur_seg_map[-stride];
+ const int al = cur_seg_map[-(stride + 1)];
+
+ if (l == a && al == l) *seg_ctx = 2;
+ else if (l == a || al == l || a == al) *seg_ctx = 1;
+ else *seg_ctx = 0;
+ return a == al ? a : l;
+ } else {
+ *seg_ctx = 0;
+ return have_left ? cur_seg_map[-1] : have_top ? cur_seg_map[-stride] : 0;
+ }
+}
+
+static inline void fix_int_mv_precision(mv *const mv) {
+ mv->x = (mv->x - (mv->x >> 15) + 3) & ~7U;
+ mv->y = (mv->y - (mv->y >> 15) + 3) & ~7U;
+}
+
+static inline void fix_mv_precision(const Dav1dFrameHeader *const hdr,
+ mv *const mv)
+{
+ if (hdr->force_integer_mv) {
+ fix_int_mv_precision(mv);
+ } else if (!hdr->hp) {
+ mv->x = (mv->x - (mv->x >> 15)) & ~1U;
+ mv->y = (mv->y - (mv->y >> 15)) & ~1U;
+ }
+}
+
+static inline mv get_gmv_2d(const Dav1dWarpedMotionParams *const gmv,
+ const int bx4, const int by4,
+ const int bw4, const int bh4,
+ const Dav1dFrameHeader *const hdr)
+{
+ switch (gmv->type) {
+ case DAV1D_WM_TYPE_ROT_ZOOM:
+ assert(gmv->matrix[5] == gmv->matrix[2]);
+ assert(gmv->matrix[4] == -gmv->matrix[3]);
+ // fall-through
+ default:
+ case DAV1D_WM_TYPE_AFFINE: {
+ const int x = bx4 * 4 + bw4 * 2 - 1;
+ const int y = by4 * 4 + bh4 * 2 - 1;
+ const int xc = (gmv->matrix[2] - (1 << 16)) * x +
+ gmv->matrix[3] * y + gmv->matrix[0];
+ const int yc = (gmv->matrix[5] - (1 << 16)) * y +
+ gmv->matrix[4] * x + gmv->matrix[1];
+ const int shift = 16 - (3 - !hdr->hp);
+ const int round = (1 << shift) >> 1;
+ mv res = (mv) {
+ .y = apply_sign(((abs(yc) + round) >> shift) << !hdr->hp, yc),
+ .x = apply_sign(((abs(xc) + round) >> shift) << !hdr->hp, xc),
+ };
+ if (hdr->force_integer_mv)
+ fix_int_mv_precision(&res);
+ return res;
+ }
+ case DAV1D_WM_TYPE_TRANSLATION: {
+ mv res = (mv) {
+ .y = gmv->matrix[0] >> 13,
+ .x = gmv->matrix[1] >> 13,
+ };
+ if (hdr->force_integer_mv)
+ fix_int_mv_precision(&res);
+ return res;
+ }
+ case DAV1D_WM_TYPE_IDENTITY:
+ return (mv) { .x = 0, .y = 0 };
+ }
+}
+
+#endif /* DAV1D_SRC_ENV_H */