ref: cbec1241fe6f6d43710348a5c04aad1b81059f19
dir: /src/env.h/
/*
* 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 <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "src/levels.h"
#include "src/ref_mvs.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 cdf_element_prob(const uint16_t *const cdf, const int e) {
assert(e > 0);
return cdf[e - 1] - cdf[e];
}
static inline unsigned gather_left_partition_prob(const uint16_t *const in,
const enum BlockLevel bl)
{
unsigned out = 0;
out += cdf_element_prob(in, PARTITION_H);
if (bl != BL_128X128)
out += cdf_element_prob(in, PARTITION_H4);
// 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];
return out;
}
static inline unsigned gather_top_partition_prob(const uint16_t *const in,
const enum BlockLevel bl)
{
unsigned out = 0;
if (bl != BL_128X128)
out += cdf_element_prob(in, PARTITION_V4);
// Exploit the fact that cdfs for PARTITION_T_LEFT_SPLIT and PARTITION_T_RIGHT_SPLIT,
// and PARTITION_V, PARTITION_SPLIT and PARTITION_T_TOP_SPLIT are neighbors.
out += in[PARTITION_T_LEFT_SPLIT - 1] - in[PARTITION_T_RIGHT_SPLIT];
out += in[PARTITION_V - 1] - in[PARTITION_T_TOP_SPLIT];
return out;
}
static inline enum TxfmTypeSet get_ext_txtp_set(const enum RectTxfmSize tx,
const int inter,
const Dav1dFrameHeader *const hdr,
const int seg_id)
{
if (!hdr->segmentation.qidx[seg_id]) {
if (hdr->segmentation.lossless[seg_id]) {
assert(tx == (int) TX_4X4);
return TXTP_SET_LOSSLESS;
} else {
return TXTP_SET_DCT;
}
}
const TxfmInfo *const t_dim = &dav1d_txfm_dimensions[tx];
if (t_dim->max >= TX_64X64)
return TXTP_SET_DCT;
if (t_dim->max == TX_32X32)
return inter ? TXTP_SET_DCT_ID : TXTP_SET_DCT;
if (hdr->reduced_txtp_set)
return inter ? TXTP_SET_DCT_ID : TXTP_SET_DT4_ID;
const enum TxfmSize txsqsz = t_dim->min;
if (inter)
return txsqsz == TX_16X16 ? TXTP_SET_DT9_ID_1D : TXTP_SET_ALL;
else
return txsqsz == TX_16X16 ? TXTP_SET_DT4_ID : TXTP_SET_DT4_ID_1D;
}
static inline enum TxfmType get_uv_intra_txtp(const enum IntraPredMode uv_mode,
const enum RectTxfmSize tx,
const Dav1dFrameHeader *const hdr,
const int seg_id)
{
if (hdr->segmentation.lossless[seg_id]) {
assert(tx == (int) TX_4X4);
return WHT_WHT;
}
const TxfmInfo *const t_dim = &dav1d_txfm_dimensions[tx];
return t_dim->max == TX_32X32 ? DCT_DCT : dav1d_txtp_from_uvmode[uv_mode];
}
static inline enum TxfmType get_uv_inter_txtp(const TxfmInfo *const uvt_dim,
const enum TxfmType ytxtp,
const Dav1dFrameHeader *const hdr,
const int seg_id)
{
if (hdr->segmentation.lossless[seg_id]) {
assert(uvt_dim->max == TX_4X4);
return WHT_WHT;
}
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 candidate_mv *const ref_mv_stack,
const int ref_idx)
{
if (ref_mv_stack[ref_idx].weight >= 640 &&
ref_mv_stack[ref_idx + 1].weight >= 640)
return 0;
if (ref_mv_stack[ref_idx].weight >= 640 &&
ref_mv_stack[ref_idx + 1].weight < 640)
return 1;
if (ref_mv_stack[ref_idx].weight < 640 &&
ref_mv_stack[ref_idx + 1].weight < 640)
return 2;
return 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 int get_coef_skip_ctx(const TxfmInfo *const t_dim,
const enum BlockSize bs,
const uint8_t *const a,
const uint8_t *const l,
const int chroma,
const enum Dav1dPixelLayout layout)
{
const uint8_t *const b_dim = dav1d_block_dimensions[bs];
if (chroma) {
const int ss_ver = layout == DAV1D_PIXEL_LAYOUT_I420;
const int ss_hor = layout != DAV1D_PIXEL_LAYOUT_I444;
const int not_one_blk = b_dim[2] - (!!b_dim[2] && ss_hor) > t_dim->lw ||
b_dim[3] - (!!b_dim[3] && ss_ver) > t_dim->lh;
int ca, cl;
#define MERGE_CTX(dir, type, mask) \
c##dir = !!((*(const type *) dir) & mask); \
break
switch (t_dim->lw) {
case TX_4X4: MERGE_CTX(a, uint8_t, 0x3F);
case TX_8X8: MERGE_CTX(a, uint16_t, 0x3F3F);
case TX_16X16: MERGE_CTX(a, uint32_t, 0x3F3F3F3FU);
case TX_32X32: MERGE_CTX(a, uint64_t, 0x3F3F3F3F3F3F3F3FULL);
default: abort();
}
switch (t_dim->lh) {
case TX_4X4: MERGE_CTX(l, uint8_t, 0x3F);
case TX_8X8: MERGE_CTX(l, uint16_t, 0x3F3F);
case TX_16X16: MERGE_CTX(l, uint32_t, 0x3F3F3F3FU);
case TX_32X32: MERGE_CTX(l, uint64_t, 0x3F3F3F3F3F3F3F3FULL);
default: abort();
}
#undef MERGE_CTX
return 7 + not_one_blk * 3 + ca + cl;
} else if (b_dim[2] == t_dim->lw && b_dim[3] == t_dim->lh) {
return 0;
} else {
static const uint8_t skip_contexts[5][5] = {
{ 1, 2, 2, 2, 3 },
{ 1, 4, 4, 4, 5 },
{ 1, 4, 4, 4, 5 },
{ 1, 4, 4, 4, 5 },
{ 1, 4, 4, 4, 6 }
};
uint64_t la, ll;
#define MERGE_CTX(dir, type, tx) do { \
l##dir = *(const type *) dir; \
if (tx == TX_64X64) \
l##dir |= *(const type *) &dir[sizeof(type)]; \
if (tx >= TX_32X32) l##dir |= l##dir >> 32; \
if (tx >= TX_16X16) l##dir |= l##dir >> 16; \
if (tx >= TX_8X8) l##dir |= l##dir >> 8; \
l##dir &= 0x3F; \
} while (0); \
break
switch (t_dim->lw) {
case TX_4X4: MERGE_CTX(a, uint8_t, TX_4X4);
case TX_8X8: MERGE_CTX(a, uint16_t, TX_8X8);
case TX_16X16: MERGE_CTX(a, uint32_t, TX_16X16);
case TX_32X32: MERGE_CTX(a, uint64_t, TX_32X32);
case TX_64X64: MERGE_CTX(a, uint64_t, TX_64X64);
}
switch (t_dim->lh) {
case TX_4X4: MERGE_CTX(l, uint8_t, TX_4X4);
case TX_8X8: MERGE_CTX(l, uint16_t, TX_8X8);
case TX_16X16: MERGE_CTX(l, uint32_t, TX_16X16);
case TX_32X32: MERGE_CTX(l, uint64_t, TX_32X32);
case TX_64X64: MERGE_CTX(l, uint64_t, TX_64X64);
}
#undef MERGE_CTX
const int max = imin((int) (la | ll), 4);
const int min = imin(imin((int) la, (int) ll), 4);
return skip_contexts[min][max];
}
}
static inline int get_coef_nz_ctx(uint8_t *const levels, const int scan_idx,
const int rc, const int is_eob,
const enum RectTxfmSize tx,
const enum TxClass tx_class)
{
const TxfmInfo *const t_dim = &dav1d_txfm_dimensions[tx];
if (is_eob) {
if (scan_idx == 0) return 0;
const int eighth_sz = imin(t_dim->w, 8) * imin(t_dim->h, 8) * 2;
if (scan_idx <= eighth_sz) return 1;
const int quart_sz = eighth_sz * 2;
if (scan_idx <= quart_sz) return 2;
return 3;
}
const int x = rc >> (2 + imin(t_dim->lh, 3));
const int y = rc & (4 * imin(t_dim->h, 8) - 1);
const ptrdiff_t stride = 4 * (imin(t_dim->h, 8) + 1);
static const uint8_t offsets[3][5][2 /* x, y */] = {
[TX_CLASS_2D] = {
{ 0, 1 }, { 1, 0 }, { 2, 0 }, { 0, 2 }, { 1, 1 }
}, [TX_CLASS_V] = {
{ 0, 1 }, { 1, 0 }, { 0, 2 }, { 0, 3 }, { 0, 4 }
}, [TX_CLASS_H] = {
{ 0, 1 }, { 1, 0 }, { 2, 0 }, { 3, 0 }, { 4, 0 }
}
};
const uint8_t (*const off)[2] = offsets[tx_class];
int mag = 0;
for (int i = 0; i < 5; i++)
mag += imin(levels[(x + off[i][0]) * stride + (y + off[i][1])], 3);
const int ctx = imin((mag + 1) >> 1, 4);
if (tx_class == TX_CLASS_2D) {
return !rc ? 0 :
dav1d_nz_map_ctx_offset[tx][imin(y, 4)][imin(x, 4)] + ctx;
} else {
return 26 + imin((tx_class == TX_CLASS_V) ? y : x, 2) * 5 + ctx;
}
}
static inline int get_dc_sign_ctx(const TxfmInfo *const t_dim,
const uint8_t *const a,
const uint8_t *const l)
{
uint64_t sa, sl;
#define MERGE_CTX(dir, type, tx, mask) do { \
s##dir = ((*(const type *) dir) >> 6) & mask; \
if (tx == TX_64X64) \
s##dir += ((*(const type *) &dir[sizeof(type)]) >> 6) & mask; \
if (tx >= TX_32X32) s##dir += s##dir >> 32; \
if (tx >= TX_16X16) s##dir += s##dir >> 16; \
if (tx >= TX_8X8) s##dir += s##dir >> 8; \
} while (0); \
break
switch (t_dim->lw) {
case TX_4X4: MERGE_CTX(a, uint8_t, TX_4X4, 0x03);
case TX_8X8: MERGE_CTX(a, uint16_t, TX_8X8, 0x0303);
case TX_16X16: MERGE_CTX(a, uint32_t, TX_16X16, 0x03030303U);
case TX_32X32: MERGE_CTX(a, uint64_t, TX_32X32, 0x0303030303030303ULL);
case TX_64X64: MERGE_CTX(a, uint64_t, TX_64X64, 0x0303030303030303ULL);
}
switch (t_dim->lh) {
case TX_4X4: MERGE_CTX(l, uint8_t, TX_4X4, 0x03);
case TX_8X8: MERGE_CTX(l, uint16_t, TX_8X8, 0x0303);
case TX_16X16: MERGE_CTX(l, uint32_t, TX_16X16, 0x03030303U);
case TX_32X32: MERGE_CTX(l, uint64_t, TX_32X32, 0x0303030303030303ULL);
case TX_64X64: MERGE_CTX(l, uint64_t, TX_64X64, 0x0303030303030303ULL);
}
#undef MERGE_CTX
const int s = ((int) ((sa + sl) & 0xFF)) - (t_dim->w + t_dim->h);
return s < 0 ? 1 : s > 0 ? 2 : 0;
}
static inline int get_br_ctx(const uint8_t *const levels,
const int rc, const enum RectTxfmSize tx,
const enum TxClass tx_class)
{
const TxfmInfo *const t_dim = &dav1d_txfm_dimensions[tx];
const int x = rc >> (imin(t_dim->lh, 3) + 2);
const int y = rc & (4 * imin(t_dim->h, 8) - 1);
const int stride = 4 * (imin(t_dim->h, 8) + 1);
int mag = 0;
static const uint8_t offsets_from_txclass[3][3][2] = {
[TX_CLASS_2D] = { { 0, 1 }, { 1, 0 }, { 1, 1 } },
[TX_CLASS_H] = { { 0, 1 }, { 1, 0 }, { 0, 2 } },
[TX_CLASS_V] = { { 0, 1 }, { 1, 0 }, { 2, 0 } }
};
const uint8_t (*const offsets)[2] = offsets_from_txclass[tx_class];
for (int i = 0; i < 3; i++)
mag += levels[(x + offsets[i][1]) * stride + y + offsets[i][0]];
mag = imin((mag + 1) >> 1, 6);
if (rc == 0) return mag;
switch (tx_class) {
case TX_CLASS_2D:
if (y < 2 && x < 2) return mag + 7;
break;
case TX_CLASS_H:
if (x == 0) return mag + 7;
break;
case TX_CLASS_V:
if (y == 0) return mag + 7;
break;
}
return mag + 14;
}
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;
return (mv) {
.y = apply_sign(((abs(yc) + round) >> shift) << !hdr->hp, yc),
.x = apply_sign(((abs(xc) + round) >> shift) << !hdr->hp, xc),
};
}
case DAV1D_WM_TYPE_TRANSLATION:
return (mv) {
.y = gmv->matrix[0] >> 13,
.x = gmv->matrix[1] >> 13,
};
case DAV1D_WM_TYPE_IDENTITY:
return (mv) { .x = 0, .y = 0 };
}
}
#endif /* DAV1D_SRC_ENV_H */