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* 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 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
#ifndef AV1_COMMON_SCAN_H_
#define AV1_COMMON_SCAN_H_
#include "aom/aom_integer.h"
#include "aom_ports/mem.h"
#include "av1/common/enums.h"
#include "av1/common/onyxc_int.h"
#include "av1/common/blockd.h"
#ifdef __cplusplus
extern "C" {
extern const SCAN_ORDER av1_default_scan_orders[TX_SIZES];
extern const SCAN_ORDER av1_intra_scan_orders[TX_SIZES_ALL][TX_TYPES];
extern const SCAN_ORDER av1_inter_scan_orders[TX_SIZES_ALL][TX_TYPES];
void av1_update_scan_count_facade(AV1_COMMON *cm, FRAME_COUNTS *counts,
TX_SIZE tx_size, TX_TYPE tx_type,
const tran_low_t *dqcoeffs, int max_scan);
// embed r + c and coeff_idx info with nonzero probabilities. When sorting the
// nonzero probabilities, if there is a tie, the coefficient with smaller r + c
// will be scanned first
void av1_augment_prob(TX_SIZE tx_size, TX_TYPE tx_type, uint32_t *prob);
// apply quick sort on nonzero probabilities to obtain a sort order
void av1_update_sort_order(TX_SIZE tx_size, TX_TYPE tx_type,
const uint32_t *non_zero_prob, int16_t *sort_order);
// apply topological sort on the nonzero probabilities sorting order to
// guarantee each to-be-scanned coefficient's upper and left coefficient will be
// scanned before the to-be-scanned coefficient.
void av1_update_scan_order(TX_SIZE tx_size, int16_t *sort_order, int16_t *scan,
int16_t *iscan);
// For each coeff_idx in scan[], update its above and left neighbors in
// neighbors[] accordingly.
void av1_update_neighbors(int tx_size, const int16_t *scan,
const int16_t *iscan, int16_t *neighbors);
void av1_init_scan_order(AV1_COMMON *cm);
void av1_adapt_scan_order(AV1_COMMON *cm);
void av1_deliver_eob_threshold(const AV1_COMMON *cm, MACROBLOCKD *xd);
static INLINE int get_coef_context(const int16_t *neighbors,
const uint8_t *token_cache, int c) {
return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >>
static INLINE const SCAN_ORDER *get_default_scan(TX_SIZE tx_size,
TX_TYPE tx_type,
int is_inter) {
return is_inter ? &av1_inter_scan_orders[tx_size][tx_type]
: &av1_intra_scan_orders[tx_size][tx_type];
return &av1_intra_scan_orders[tx_size][tx_type];
#endif // CONFIG_EXT_TX
static INLINE const SCAN_ORDER *get_scan(const AV1_COMMON *cm, TX_SIZE tx_size,
TX_TYPE tx_type,
const MB_MODE_INFO *mbmi) {
return &cm->fc->sc[tx_size][tx_type];
const int is_inter = is_inter_block(mbmi);
return get_default_scan(tx_size, tx_type, is_inter);
#ifdef __cplusplus
} // extern "C"
#endif // AV1_COMMON_SCAN_H_