ref: 3b14f94924987fc66302bb8b803ad9065816f93e
dir: dav1d/src/refmvs.c
/*
* Copyright © 2020, VideoLAN and dav1d authors
* Copyright © 2020, 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.
*/
#include "config.h"
#include <limits.h>
#include <stdlib.h>
#include "dav1d/common.h"
#include "common/intops.h"
#include "src/env.h"
#include "src/refmvs.h"
static void add_spatial_candidate(refmvs_candidate *const mvstack, int *const cnt,
const int weight, const refmvs_block *const b,
const union refmvs_refpair ref, const mv gmv[2],
int *const have_newmv_match,
int *const have_refmv_match)
{
if (b->mv.mv[0].n == INVALID_MV) return; // intra block, no intrabc
if (ref.ref[1] == -1) {
for (int n = 0; n < 2; n++) {
if (b->ref.ref[n] == ref.ref[0]) {
const mv cand_mv = ((b->mf & 1) && gmv[0].n != INVALID_MV) ?
gmv[0] : b->mv.mv[n];
const int last = *cnt;
for (int m = 0; m < last; m++)
if (mvstack[m].mv.mv[0].n == cand_mv.n) {
mvstack[m].weight += weight;
*have_refmv_match = 1;
*have_newmv_match |= b->mf >> 1;
return;
}
if (last < 8) {
mvstack[last].mv.mv[0] = cand_mv;
mvstack[last].weight = weight;
*cnt = last + 1;
}
*have_refmv_match = 1;
*have_newmv_match |= b->mf >> 1;
return;
}
}
} else if (b->ref.pair == ref.pair) {
const refmvs_mvpair cand_mv = { .mv = {
[0] = ((b->mf & 1) && gmv[0].n != INVALID_MV) ? gmv[0] : b->mv.mv[0],
[1] = ((b->mf & 1) && gmv[1].n != INVALID_MV) ? gmv[1] : b->mv.mv[1],
}};
const int last = *cnt;
for (int n = 0; n < last; n++)
if (mvstack[n].mv.n == cand_mv.n) {
mvstack[n].weight += weight;
*have_refmv_match = 1;
*have_newmv_match |= b->mf >> 1;
return;
}
if (last < 8) {
mvstack[last].mv = cand_mv;
mvstack[last].weight = weight;
*cnt = last + 1;
}
*have_refmv_match = 1;
*have_newmv_match |= b->mf >> 1;
}
}
static int scan_row(refmvs_candidate *const mvstack, int *const cnt,
const union refmvs_refpair ref, const mv gmv[2],
const refmvs_block *b, const int bw4, const int w4,
const int max_rows, const int step,
int *const have_newmv_match, int *const have_refmv_match)
{
const refmvs_block *cand_b = b;
const enum BlockSize first_cand_bs = cand_b->bs;
const uint8_t *const first_cand_b_dim = dav1d_block_dimensions[first_cand_bs];
int cand_bw4 = first_cand_b_dim[0];
int len = imax(step, imin(bw4, cand_bw4));
if (bw4 <= cand_bw4) {
// FIXME weight can be higher for odd blocks (bx4 & 1), but then the
// position of the first block has to be odd already, i.e. not just
// for row_offset=-3/-5
// FIXME why can this not be cand_bw4?
const int weight = bw4 == 1 ? 2 :
imax(2, imin(2 * max_rows, first_cand_b_dim[1]));
add_spatial_candidate(mvstack, cnt, len * weight, cand_b, ref, gmv,
have_newmv_match, have_refmv_match);
return weight >> 1;
}
for (int x = 0;;) {
// FIXME if we overhang above, we could fill a bitmask so we don't have
// to repeat the add_spatial_candidate() for the next row, but just increase
// the weight here
add_spatial_candidate(mvstack, cnt, len * 2, cand_b, ref, gmv,
have_newmv_match, have_refmv_match);
x += len;
if (x >= w4) return 1;
cand_b = &b[x];
cand_bw4 = dav1d_block_dimensions[cand_b->bs][0];
assert(cand_bw4 < bw4);
len = imax(step, cand_bw4);
}
}
static int scan_col(refmvs_candidate *const mvstack, int *const cnt,
const union refmvs_refpair ref, const mv gmv[2],
/*const*/ refmvs_block *const *b, const int bh4, const int h4,
const int bx4, const int max_cols, const int step,
int *const have_newmv_match, int *const have_refmv_match)
{
const refmvs_block *cand_b = &b[0][bx4];
const enum BlockSize first_cand_bs = cand_b->bs;
const uint8_t *const first_cand_b_dim = dav1d_block_dimensions[first_cand_bs];
int cand_bh4 = first_cand_b_dim[1];
int len = imax(step, imin(bh4, cand_bh4));
if (bh4 <= cand_bh4) {
// FIXME weight can be higher for odd blocks (by4 & 1), but then the
// position of the first block has to be odd already, i.e. not just
// for col_offset=-3/-5
// FIXME why can this not be cand_bh4?
const int weight = bh4 == 1 ? 2 :
imax(2, imin(2 * max_cols, first_cand_b_dim[0]));
add_spatial_candidate(mvstack, cnt, len * weight, cand_b, ref, gmv,
have_newmv_match, have_refmv_match);
return weight >> 1;
}
for (int y = 0;;) {
// FIXME if we overhang above, we could fill a bitmask so we don't have
// to repeat the add_spatial_candidate() for the next row, but just increase
// the weight here
add_spatial_candidate(mvstack, cnt, len * 2, cand_b, ref, gmv,
have_newmv_match, have_refmv_match);
y += len;
if (y >= h4) return 1;
cand_b = &b[y][bx4];
cand_bh4 = dav1d_block_dimensions[cand_b->bs][1];
assert(cand_bh4 < bh4);
len = imax(step, cand_bh4);
}
}
static inline union mv mv_projection(const union mv mv, const int num, const int den) {
static const uint16_t div_mult[32] = {
0, 16384, 8192, 5461, 4096, 3276, 2730, 2340,
2048, 1820, 1638, 1489, 1365, 1260, 1170, 1092,
1024, 963, 910, 862, 819, 780, 744, 712,
682, 655, 630, 606, 585, 564, 546, 528
};
assert(den > 0 && den < 32);
assert(num > -32 && num < 32);
const int frac = num * div_mult[den];
const int y = mv.y * frac, x = mv.x * frac;
// Round and clip according to AV1 spec section 7.9.3
union mv res = {0}; // 0x3fff == (1 << 14) - 1
res.y = iclip((y + 8192 + (y >> 31)) >> 14, -0x3fff, 0x3fff);
res.x = iclip((x + 8192 + (x >> 31)) >> 14, -0x3fff, 0x3fff);
return res;
}
static void add_temporal_candidate(const refmvs_frame *const rf,
refmvs_candidate *const mvstack, int *const cnt,
const refmvs_temporal_block *const rb,
const union refmvs_refpair ref, int *const globalmv_ctx,
const union mv gmv[])
{
if (rb->mv.n == INVALID_MV) return;
union mv mv = mv_projection(rb->mv, rf->pocdiff[ref.ref[0] - 1], rb->ref);
fix_mv_precision(rf->frm_hdr, &mv);
const int last = *cnt;
if (ref.ref[1] == -1) {
if (globalmv_ctx)
*globalmv_ctx = (abs(mv.x - gmv[0].x) | abs(mv.y - gmv[0].y)) >= 16;
for (int n = 0; n < last; n++)
if (mvstack[n].mv.mv[0].n == mv.n) {
mvstack[n].weight += 2;
return;
}
if (last < 8) {
mvstack[last].mv.mv[0] = mv;
mvstack[last].weight = 2;
*cnt = last + 1;
}
} else {
refmvs_mvpair mvp = { .mv = {
[0] = mv,
[1] = mv_projection(rb->mv, rf->pocdiff[ref.ref[1] - 1], rb->ref),
}};
fix_mv_precision(rf->frm_hdr, &mvp.mv[1]);
for (int n = 0; n < last; n++)
if (mvstack[n].mv.n == mvp.n) {
mvstack[n].weight += 2;
return;
}
if (last < 8) {
mvstack[last].mv = mvp;
mvstack[last].weight = 2;
*cnt = last + 1;
}
}
}
static void add_compound_extended_candidate(refmvs_candidate *const same,
int *const same_count,
const refmvs_block *const cand_b,
const int sign0, const int sign1,
const union refmvs_refpair ref,
const uint8_t *const sign_bias)
{
refmvs_candidate *const diff = &same[2];
int *const diff_count = &same_count[2];
for (int n = 0; n < 2; n++) {
const int cand_ref = cand_b->ref.ref[n];
if (cand_ref <= 0) break;
mv cand_mv = cand_b->mv.mv[n];
if (cand_ref == ref.ref[0]) {
if (same_count[0] < 2)
same[same_count[0]++].mv.mv[0] = cand_mv;
if (diff_count[1] < 2) {
if (sign1 ^ sign_bias[cand_ref - 1]) {
cand_mv.y = -cand_mv.y;
cand_mv.x = -cand_mv.x;
}
diff[diff_count[1]++].mv.mv[1] = cand_mv;
}
} else if (cand_ref == ref.ref[1]) {
if (same_count[1] < 2)
same[same_count[1]++].mv.mv[1] = cand_mv;
if (diff_count[0] < 2) {
if (sign0 ^ sign_bias[cand_ref - 1]) {
cand_mv.y = -cand_mv.y;
cand_mv.x = -cand_mv.x;
}
diff[diff_count[0]++].mv.mv[0] = cand_mv;
}
} else {
union mv i_cand_mv = {0};
i_cand_mv.x = -cand_mv.x;
i_cand_mv.y = -cand_mv.y;
if (diff_count[0] < 2) {
diff[diff_count[0]++].mv.mv[0] =
sign0 ^ sign_bias[cand_ref - 1] ?
i_cand_mv : cand_mv;
}
if (diff_count[1] < 2) {
diff[diff_count[1]++].mv.mv[1] =
sign1 ^ sign_bias[cand_ref - 1] ?
i_cand_mv : cand_mv;
}
}
}
}
static void add_single_extended_candidate(refmvs_candidate mvstack[8], int *const cnt,
const refmvs_block *const cand_b,
const int sign, const uint8_t *const sign_bias)
{
for (int n = 0; n < 2; n++) {
const int cand_ref = cand_b->ref.ref[n];
if (cand_ref <= 0) break;
// we need to continue even if cand_ref == ref.ref[0], since
// the candidate could have been added as a globalmv variant,
// which changes the value
// FIXME if scan_{row,col}() returned a mask for the nearest
// edge, we could skip the appropriate ones here
mv cand_mv = cand_b->mv.mv[n];
if (sign ^ sign_bias[cand_ref - 1]) {
cand_mv.y = -cand_mv.y;
cand_mv.x = -cand_mv.x;
}
int m;
const int last = *cnt;
for (m = 0; m < last; m++)
if (cand_mv.n == mvstack[m].mv.mv[0].n)
break;
if (m == last) {
mvstack[m].mv.mv[0] = cand_mv;
mvstack[m].weight = 2; // "minimal"
*cnt = last + 1;
}
}
}
/*
* refmvs_frame allocates memory for one sbrow (32 blocks high, whole frame
* wide) of 4x4-resolution refmvs_block entries for spatial MV referencing.
* mvrefs_tile[] keeps a list of 35 (32 + 3 above) pointers into this memory,
* and each sbrow, the bottom entries (y=27/29/31) are exchanged with the top
* (-5/-3/-1) pointers by calling dav1d_refmvs_tile_sbrow_init() at the start
* of each tile/sbrow.
*
* For temporal MV referencing, we call dav1d_refmvs_save_tmvs() at the end of
* each tile/sbrow (when tile column threading is enabled), or at the start of
* each interleaved sbrow (i.e. once for all tile columns together, when tile
* column threading is disabled). This will copy the 4x4-resolution spatial MVs
* into 8x8-resolution refmvs_temporal_block structures. Then, for subsequent
* frames, at the start of each tile/sbrow (when tile column threading is
* enabled) or at the start of each interleaved sbrow (when tile column
* threading is disabled), we call load_tmvs(), which will project the MVs to
* their respective position in the current frame.
*/
void dav1d_refmvs_find(const refmvs_tile *const rt,
refmvs_candidate mvstack[8], int *const cnt,
int *const ctx,
const union refmvs_refpair ref, const enum BlockSize bs,
const enum EdgeFlags edge_flags,
const int by4, const int bx4)
{
const refmvs_frame *const rf = rt->rf;
const uint8_t *const b_dim = dav1d_block_dimensions[bs];
const int bw4 = b_dim[0], w4 = imin(imin(bw4, 16), rt->tile_col.end - bx4);
const int bh4 = b_dim[1], h4 = imin(imin(bh4, 16), rt->tile_row.end - by4);
mv gmv[2], tgmv[2], imv = { .n = INVALID_MV };
*cnt = 0;
assert(ref.ref[0] >= 0 && ref.ref[0] <= 8 &&
ref.ref[1] >= -1 && ref.ref[1] <= 8);
if (ref.ref[0] > 0) {
tgmv[0] = get_gmv_2d(&rf->frm_hdr->gmv[ref.ref[0] - 1],
bx4, by4, bw4, bh4, rf->frm_hdr);
gmv[0] = rf->frm_hdr->gmv[ref.ref[0] - 1].type > DAV1D_WM_TYPE_TRANSLATION ?
tgmv[0] : imv;
} else {
memset(&tgmv[0], 0, sizeof(tgmv[0]));
gmv[0] = imv;
}
if (ref.ref[1] > 0) {
tgmv[1] = get_gmv_2d(&rf->frm_hdr->gmv[ref.ref[1] - 1],
bx4, by4, bw4, bh4, rf->frm_hdr);
gmv[1] = rf->frm_hdr->gmv[ref.ref[1] - 1].type > DAV1D_WM_TYPE_TRANSLATION ?
tgmv[1] : imv;
}
// top
int have_newmv = 0, have_col_mvs = 0, have_row_mvs = 0;
unsigned max_rows = 0, n_rows = ~0;
const refmvs_block *b_top;
if (by4 > rt->tile_row.start) {
max_rows = imin((by4 - rt->tile_row.start + 1) >> 1, 2 + (bh4 > 1));
b_top = &rt->r[(by4 & 31) - 1 + 5][bx4];
n_rows = scan_row(mvstack, cnt, ref, gmv, b_top,
bw4, w4, max_rows, bw4 >= 16 ? 4 : 1,
&have_newmv, &have_row_mvs);
}
// left
unsigned max_cols = 0, n_cols = ~0U;
refmvs_block *const *b_left;
if (bx4 > rt->tile_col.start) {
max_cols = imin((bx4 - rt->tile_col.start + 1) >> 1, 2 + (bw4 > 1));
b_left = &rt->r[(by4 & 31) + 5];
n_cols = scan_col(mvstack, cnt, ref, gmv, b_left,
bh4, h4, bx4 - 1, max_cols, bh4 >= 16 ? 4 : 1,
&have_newmv, &have_col_mvs);
}
// top/right
if (n_rows != ~0U && edge_flags & EDGE_I444_TOP_HAS_RIGHT &&
imax(bw4, bh4) <= 16 && bw4 + bx4 < rt->tile_col.end)
{
add_spatial_candidate(mvstack, cnt, 4, &b_top[bw4], ref, gmv,
&have_newmv, &have_row_mvs);
}
const int nearest_match = have_col_mvs + have_row_mvs;
const int nearest_cnt = *cnt;
for (int n = 0; n < nearest_cnt; n++)
mvstack[n].weight += 640;
// temporal
int globalmv_ctx = rf->frm_hdr->use_ref_frame_mvs;
if (rf->use_ref_frame_mvs) {
const ptrdiff_t stride = rf->rp_stride;
const int by8 = by4 >> 1, bx8 = bx4 >> 1;
const refmvs_temporal_block *const rbi = &rt->rp_proj[(by8 & 15) * stride + bx8];
const refmvs_temporal_block *rb = rbi;
const int step_h = bw4 >= 16 ? 2 : 1, step_v = bh4 >= 16 ? 2 : 1;
const int w8 = imin((w4 + 1) >> 1, 8), h8 = imin((h4 + 1) >> 1, 8);
for (int y = 0; y < h8; y += step_v) {
for (int x = 0; x < w8; x+= step_h) {
add_temporal_candidate(rf, mvstack, cnt, &rb[x], ref,
!(x | y) ? &globalmv_ctx : NULL, tgmv);
}
rb += stride * step_v;
}
if (imin(bw4, bh4) >= 2 && imax(bw4, bh4) < 16) {
const int bh8 = bh4 >> 1, bw8 = bw4 >> 1;
rb = &rbi[bh8 * stride];
const int has_bottom = by8 + bh8 < imin(rt->tile_row.end >> 1,
(by8 & ~7) + 8);
if (has_bottom && bx8 - 1 >= imax(rt->tile_col.start >> 1, bx8 & ~7)) {
add_temporal_candidate(rf, mvstack, cnt, &rb[-1], ref,
NULL, NULL);
}
if (bx8 + bw8 < imin(rt->tile_col.end >> 1, (bx8 & ~7) + 8)) {
if (has_bottom) {
add_temporal_candidate(rf, mvstack, cnt, &rb[bw8], ref,
NULL, NULL);
}
if (by8 + bh8 - 1 < imin(rt->tile_row.end >> 1, (by8 & ~7) + 8)) {
add_temporal_candidate(rf, mvstack, cnt, &rb[bw8 - stride],
ref, NULL, NULL);
}
}
}
}
assert(*cnt <= 8);
// top/left (which, confusingly, is part of "secondary" references)
int have_dummy_newmv_match;
if ((n_rows | n_cols) != ~0U) {
add_spatial_candidate(mvstack, cnt, 4, &b_top[-1], ref, gmv,
&have_dummy_newmv_match, &have_row_mvs);
}
// "secondary" (non-direct neighbour) top & left edges
// what is different about secondary is that everything is now in 8x8 resolution
for (int n = 2; n <= 3; n++) {
if ((unsigned) n > n_rows && (unsigned) n <= max_rows) {
n_rows += scan_row(mvstack, cnt, ref, gmv,
&rt->r[(((by4 & 31) - 2 * n + 1) | 1) + 5][bx4 | 1],
bw4, w4, 1 + max_rows - n, bw4 >= 16 ? 4 : 2,
&have_dummy_newmv_match, &have_row_mvs);
}
if ((unsigned) n > n_cols && (unsigned) n <= max_cols) {
n_cols += scan_col(mvstack, cnt, ref, gmv, &rt->r[((by4 & 31) | 1) + 5],
bh4, h4, (bx4 - n * 2 + 1) | 1,
1 + max_cols - n, bh4 >= 16 ? 4 : 2,
&have_dummy_newmv_match, &have_col_mvs);
}
}
assert(*cnt <= 8);
const int ref_match_count = have_col_mvs + have_row_mvs;
// context build-up
int refmv_ctx, newmv_ctx;
switch (nearest_match) {
case 0:
refmv_ctx = imin(2, ref_match_count);
newmv_ctx = ref_match_count > 0;
break;
case 1:
refmv_ctx = imin(ref_match_count * 3, 4);
newmv_ctx = 3 - have_newmv;
break;
case 2:
refmv_ctx = 5;
newmv_ctx = 5 - have_newmv;
break;
}
// sorting (nearest, then "secondary")
int len = nearest_cnt;
while (len) {
int last = 0;
for (int n = 1; n < len; n++) {
if (mvstack[n - 1].weight < mvstack[n].weight) {
#define EXCHANGE(a, b) do { refmvs_candidate tmp = a; a = b; b = tmp; } while (0)
EXCHANGE(mvstack[n - 1], mvstack[n]);
last = n;
}
}
len = last;
}
len = *cnt;
while (len > nearest_cnt) {
int last = nearest_cnt;
for (int n = nearest_cnt + 1; n < len; n++) {
if (mvstack[n - 1].weight < mvstack[n].weight) {
EXCHANGE(mvstack[n - 1], mvstack[n]);
#undef EXCHANGE
last = n;
}
}
len = last;
}
if (ref.ref[1] > 0) {
if (*cnt < 2) {
const int sign0 = rf->sign_bias[ref.ref[0] - 1];
const int sign1 = rf->sign_bias[ref.ref[1] - 1];
const int sz4 = imin(w4, h4);
refmvs_candidate *const same = &mvstack[*cnt];
int same_count[4] = { 0 };
// non-self references in top
if (n_rows != ~0U) for (int x = 0; x < sz4;) {
const refmvs_block *const cand_b = &b_top[x];
add_compound_extended_candidate(same, same_count, cand_b,
sign0, sign1, ref, rf->sign_bias);
x += dav1d_block_dimensions[cand_b->bs][0];
}
// non-self references in left
if (n_cols != ~0U) for (int y = 0; y < sz4;) {
const refmvs_block *const cand_b = &b_left[y][bx4 - 1];
add_compound_extended_candidate(same, same_count, cand_b,
sign0, sign1, ref, rf->sign_bias);
y += dav1d_block_dimensions[cand_b->bs][1];
}
refmvs_candidate *const diff = &same[2];
const int *const diff_count = &same_count[2];
// merge together
for (int n = 0; n < 2; n++) {
int m = same_count[n];
if (m >= 2) continue;
const int l = diff_count[n];
if (l) {
same[m].mv.mv[n] = diff[0].mv.mv[n];
if (++m == 2) continue;
if (l == 2) {
same[1].mv.mv[n] = diff[1].mv.mv[n];
continue;
}
}
do {
same[m].mv.mv[n] = tgmv[n];
} while (++m < 2);
}
// if the first extended was the same as the non-extended one,
// then replace it with the second extended one
int n = *cnt;
if (n == 1 && mvstack[0].mv.n == same[0].mv.n)
mvstack[1].mv = mvstack[2].mv;
do {
mvstack[n].weight = 2;
} while (++n < 2);
*cnt = 2;
}
// clamping
const int left = -(bx4 + bw4 + 4) * 4 * 8;
const int right = (rf->iw4 - bx4 + 4) * 4 * 8;
const int top = -(by4 + bh4 + 4) * 4 * 8;
const int bottom = (rf->ih4 - by4 + 4) * 4 * 8;
const int n_refmvs = *cnt;
int n = 0;
do {
mvstack[n].mv.mv[0].x = iclip(mvstack[n].mv.mv[0].x, left, right);
mvstack[n].mv.mv[0].y = iclip(mvstack[n].mv.mv[0].y, top, bottom);
mvstack[n].mv.mv[1].x = iclip(mvstack[n].mv.mv[1].x, left, right);
mvstack[n].mv.mv[1].y = iclip(mvstack[n].mv.mv[1].y, top, bottom);
} while (++n < n_refmvs);
switch (refmv_ctx >> 1) {
case 0:
*ctx = imin(newmv_ctx, 1);
break;
case 1:
*ctx = 1 + imin(newmv_ctx, 3);
break;
case 2:
*ctx = iclip(3 + newmv_ctx, 4, 7);
break;
}
return;
} else if (*cnt < 2 && ref.ref[0] > 0) {
const int sign = rf->sign_bias[ref.ref[0] - 1];
const int sz4 = imin(w4, h4);
// non-self references in top
if (n_rows != ~0U) for (int x = 0; x < sz4 && *cnt < 2;) {
const refmvs_block *const cand_b = &b_top[x];
add_single_extended_candidate(mvstack, cnt, cand_b, sign, rf->sign_bias);
x += dav1d_block_dimensions[cand_b->bs][0];
}
// non-self references in left
if (n_cols != ~0U) for (int y = 0; y < sz4 && *cnt < 2;) {
const refmvs_block *const cand_b = &b_left[y][bx4 - 1];
add_single_extended_candidate(mvstack, cnt, cand_b, sign, rf->sign_bias);
y += dav1d_block_dimensions[cand_b->bs][1];
}
}
assert(*cnt <= 8);
// clamping
int n_refmvs = *cnt;
if (n_refmvs) {
const int left = -(bx4 + bw4 + 4) * 4 * 8;
const int right = (rf->iw4 - bx4 + 4) * 4 * 8;
const int top = -(by4 + bh4 + 4) * 4 * 8;
const int bottom = (rf->ih4 - by4 + 4) * 4 * 8;
int n = 0;
do {
mvstack[n].mv.mv[0].x = iclip(mvstack[n].mv.mv[0].x, left, right);
mvstack[n].mv.mv[0].y = iclip(mvstack[n].mv.mv[0].y, top, bottom);
} while (++n < n_refmvs);
}
for (int n = *cnt; n < 2; n++)
mvstack[n].mv.mv[0] = tgmv[0];
*ctx = (refmv_ctx << 4) | (globalmv_ctx << 3) | newmv_ctx;
}
void dav1d_refmvs_tile_sbrow_init(refmvs_tile *const rt, const refmvs_frame *const rf,
const int tile_col_start4, const int tile_col_end4,
const int tile_row_start4, const int tile_row_end4,
const int sby, int tile_row_idx)
{
if (rf->n_tile_threads == 1) tile_row_idx = 0;
rt->rp_proj = &rf->rp_proj[16 * rf->rp_stride * tile_row_idx];
refmvs_block *r = &rf->r[35 * rf->r_stride * tile_row_idx];
const int sbsz = rf->sbsz;
const int off = (sbsz * sby) & 16;
for (int i = 0; i < sbsz; i++, r += rf->r_stride)
rt->r[off + 5 + i] = r;
rt->r[off + 0] = r;
r += rf->r_stride;
rt->r[off + 1] = NULL;
rt->r[off + 2] = r;
r += rf->r_stride;
rt->r[off + 3] = NULL;
rt->r[off + 4] = r;
if (sby & 1) {
#define EXCHANGE(a, b) do { void *const tmp = a; a = b; b = tmp; } while (0)
EXCHANGE(rt->r[off + 0], rt->r[off + sbsz + 0]);
EXCHANGE(rt->r[off + 2], rt->r[off + sbsz + 2]);
EXCHANGE(rt->r[off + 4], rt->r[off + sbsz + 4]);
#undef EXCHANGE
}
rt->rf = rf;
rt->tile_row.start = tile_row_start4;
rt->tile_row.end = imin(tile_row_end4, rf->ih4);
rt->tile_col.start = tile_col_start4;
rt->tile_col.end = imin(tile_col_end4, rf->iw4);
}
void dav1d_refmvs_load_tmvs(const refmvs_frame *const rf, int tile_row_idx,
const int col_start8, const int col_end8,
const int row_start8, int row_end8)
{
if (rf->n_tile_threads == 1) tile_row_idx = 0;
assert(row_start8 >= 0);
assert((unsigned) (row_end8 - row_start8) <= 16U);
row_end8 = imin(row_end8, rf->ih8);
const int col_start8i = imax(col_start8 - 8, 0);
const int col_end8i = imin(col_end8 + 8, rf->iw8);
const ptrdiff_t stride = rf->rp_stride;
refmvs_temporal_block *rp_proj =
&rf->rp_proj[16 * stride * tile_row_idx + (row_start8 & 15) * stride];
for (int y = row_start8; y < row_end8; y++) {
for (int x = col_start8; x < col_end8; x++)
rp_proj[x].mv.n = INVALID_MV;
rp_proj += stride;
}
rp_proj = &rf->rp_proj[16 * stride * tile_row_idx];
for (int n = 0; n < rf->n_mfmvs; n++) {
const int ref2cur = rf->mfmv_ref2cur[n];
if (ref2cur == INT_MIN) continue;
const int ref = rf->mfmv_ref[n];
const int ref_sign = ref - 4;
const refmvs_temporal_block *r = &rf->rp_ref[ref][row_start8 * stride];
for (int y = row_start8; y < row_end8; y++) {
const int y_sb_align = y & ~7;
const int y_proj_start = imax(y_sb_align, row_start8);
const int y_proj_end = imin(y_sb_align + 8, row_end8);
for (int x = col_start8i; x < col_end8i; x++) {
const refmvs_temporal_block *rb = &r[x];
const int b_ref = rb->ref;
if (!b_ref) continue;
const int ref2ref = rf->mfmv_ref2ref[n][b_ref - 1];
if (!ref2ref) continue;
const mv b_mv = rb->mv;
const mv offset = mv_projection(b_mv, ref2cur, ref2ref);
int pos_x = x + apply_sign(abs(offset.x) >> 6,
offset.x ^ ref_sign);
const int pos_y = y + apply_sign(abs(offset.y) >> 6,
offset.y ^ ref_sign);
if (pos_y >= y_proj_start && pos_y < y_proj_end) {
const ptrdiff_t pos = (pos_y & 15) * stride;
for (;;) {
const int x_sb_align = x & ~7;
if (pos_x >= imax(x_sb_align - 8, col_start8) &&
pos_x < imin(x_sb_align + 16, col_end8))
{
rp_proj[pos + pos_x].mv = rb->mv;
rp_proj[pos + pos_x].ref = ref2ref;
}
if (++x >= col_end8i) break;
rb++;
if (rb->ref != b_ref || rb->mv.n != b_mv.n) break;
pos_x++;
}
} else {
for (;;) {
if (++x >= col_end8i) break;
rb++;
if (rb->ref != b_ref || rb->mv.n != b_mv.n) break;
}
}
x--;
}
r += stride;
}
}
}
void dav1d_refmvs_save_tmvs(const refmvs_tile *const rt,
const int col_start8, int col_end8,
const int row_start8, int row_end8)
{
const refmvs_frame *const rf = rt->rf;
assert(row_start8 >= 0);
assert((unsigned) (row_end8 - row_start8) <= 16U);
row_end8 = imin(row_end8, rf->ih8);
col_end8 = imin(col_end8, rf->iw8);
const ptrdiff_t stride = rf->rp_stride;
const uint8_t *const ref_sign = rf->mfmv_sign;
refmvs_temporal_block *rp = &rf->rp[row_start8 * stride];
for (int y = row_start8; y < row_end8; y++) {
const refmvs_block *const b = rt->r[6 + (y & 15) * 2];
for (int x = col_start8; x < col_end8;) {
const refmvs_block *const cand_b = &b[x * 2 + 1];
const int bw8 = (dav1d_block_dimensions[cand_b->bs][0] + 1) >> 1;
if (cand_b->ref.ref[1] > 0 && ref_sign[cand_b->ref.ref[1] - 1] &&
(abs(cand_b->mv.mv[1].y) | abs(cand_b->mv.mv[1].x)) < 4096)
{
for (int n = 0; n < bw8; n++, x++) {
refmvs_temporal_block b = { .mv = cand_b->mv.mv[1],
.ref = cand_b->ref.ref[1] };
rp[x] = b;
}
} else if (cand_b->ref.ref[0] > 0 && ref_sign[cand_b->ref.ref[0] - 1] &&
(abs(cand_b->mv.mv[0].y) | abs(cand_b->mv.mv[0].x)) < 4096)
{
for (int n = 0; n < bw8; n++, x++) {
refmvs_temporal_block b = { .mv = cand_b->mv.mv[0],
.ref = cand_b->ref.ref[0] };
rp[x] = b;
}
} else {
for (int n = 0; n < bw8; n++, x++)
rp[x].ref = 0; // "invalid"
}
}
rp += stride;
}
}
int dav1d_refmvs_init_frame(refmvs_frame *const rf,
const Dav1dSequenceHeader *const seq_hdr,
const Dav1dFrameHeader *const frm_hdr,
const unsigned ref_poc[7],
refmvs_temporal_block *const rp,
const unsigned ref_ref_poc[7][7],
/*const*/ refmvs_temporal_block *const rp_ref[7],
const int n_tile_threads)
{
rf->sbsz = 16 << seq_hdr->sb128;
rf->frm_hdr = frm_hdr;
rf->iw8 = (frm_hdr->width[0] + 7) >> 3;
rf->ih8 = (frm_hdr->height + 7) >> 3;
rf->iw4 = rf->iw8 << 1;
rf->ih4 = rf->ih8 << 1;
const ptrdiff_t r_stride = ((frm_hdr->width[0] + 127) & ~127) >> 2;
const int n_tile_rows = n_tile_threads > 1 ? frm_hdr->tiling.rows : 1;
if (r_stride != rf->r_stride || n_tile_rows != rf->n_tile_rows) {
if (rf->r) free(rf->r);
rf->r = malloc(sizeof(*rf->r) * 35 * r_stride * n_tile_rows);
if (!rf->r) return DAV1D_ERR(ENOMEM);
rf->r_stride = r_stride;
}
const ptrdiff_t rp_stride = r_stride >> 1;
if (rp_stride != rf->rp_stride || n_tile_rows != rf->n_tile_rows) {
if (rf->rp_proj) free(rf->rp_proj);
rf->rp_proj = malloc(sizeof(*rf->rp_proj) * 16 * rp_stride * n_tile_rows);
if (!rf->rp_proj) return DAV1D_ERR(ENOMEM);
rf->rp_stride = rp_stride;
}
rf->n_tile_rows = n_tile_rows;
rf->n_tile_threads = n_tile_threads;
rf->rp = rp;
rf->rp_ref = rp_ref;
const unsigned poc = frm_hdr->frame_offset;
for (int i = 0; i < 7; i++) {
const int poc_diff = get_poc_diff(seq_hdr->order_hint_n_bits,
ref_poc[i], poc);
rf->sign_bias[i] = poc_diff > 0;
rf->mfmv_sign[i] = poc_diff < 0;
rf->pocdiff[i] = iclip(get_poc_diff(seq_hdr->order_hint_n_bits,
poc, ref_poc[i]), -31, 31);
}
// temporal MV setup
rf->n_mfmvs = 0;
if (frm_hdr->use_ref_frame_mvs && seq_hdr->order_hint_n_bits) {
int total = 2;
if (rp_ref[0] && ref_ref_poc[0][6] != ref_poc[3] /* alt-of-last != gold */) {
rf->mfmv_ref[rf->n_mfmvs++] = 0; // last
total = 3;
}
if (rp_ref[4] && get_poc_diff(seq_hdr->order_hint_n_bits, ref_poc[4],
frm_hdr->frame_offset) > 0)
{
rf->mfmv_ref[rf->n_mfmvs++] = 4; // bwd
}
if (rp_ref[5] && get_poc_diff(seq_hdr->order_hint_n_bits, ref_poc[5],
frm_hdr->frame_offset) > 0)
{
rf->mfmv_ref[rf->n_mfmvs++] = 5; // altref2
}
if (rf->n_mfmvs < total && rp_ref[6] &&
get_poc_diff(seq_hdr->order_hint_n_bits, ref_poc[6],
frm_hdr->frame_offset) > 0)
{
rf->mfmv_ref[rf->n_mfmvs++] = 6; // altref
}
if (rf->n_mfmvs < total && rp_ref[1])
rf->mfmv_ref[rf->n_mfmvs++] = 1; // last2
for (int n = 0; n < rf->n_mfmvs; n++) {
const unsigned rpoc = ref_poc[rf->mfmv_ref[n]];
const int diff1 = get_poc_diff(seq_hdr->order_hint_n_bits,
rpoc, frm_hdr->frame_offset);
if (abs(diff1) > 31) {
rf->mfmv_ref2cur[n] = INT_MIN;
} else {
rf->mfmv_ref2cur[n] = rf->mfmv_ref[n] < 4 ? -diff1 : diff1;
for (int m = 0; m < 7; m++) {
const unsigned rrpoc = ref_ref_poc[rf->mfmv_ref[n]][m];
const int diff2 = get_poc_diff(seq_hdr->order_hint_n_bits,
rpoc, rrpoc);
// unsigned comparison also catches the < 0 case
rf->mfmv_ref2ref[n][m] = (unsigned) diff2 > 31U ? 0 : diff2;
}
}
}
}
rf->use_ref_frame_mvs = rf->n_mfmvs > 0;
return 0;
}
void dav1d_refmvs_init(refmvs_frame *const rf) {
rf->r = NULL;
rf->r_stride = 0;
rf->rp_proj = NULL;
rf->rp_stride = 0;
}
void dav1d_refmvs_clear(refmvs_frame *const rf) {
if (rf->r) free(rf->r);
if (rf->rp_proj) free(rf->rp_proj);
}