58 строки
1.7 KiB
C
58 строки
1.7 KiB
C
/*
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* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VP9_COMMON_VP9_SCAN_H_
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#define VP9_COMMON_VP9_SCAN_H_
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#include "vpx/vpx_integer.h"
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#include "vpx_ports/mem.h"
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#include "vp9/common/vp9_enums.h"
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#include "vp9/common/vp9_blockd.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MAX_NEIGHBORS 2
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typedef struct {
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const int16_t *scan;
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const int16_t *iscan;
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const int16_t *neighbors;
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} scan_order;
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extern const scan_order vp9_default_scan_orders[TX_SIZES];
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extern const scan_order vp9_scan_orders[TX_SIZES][TX_TYPES];
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static INLINE int get_coef_context(const int16_t *neighbors,
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const uint8_t *token_cache, int c) {
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return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
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token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >> 1;
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}
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static INLINE const scan_order *get_scan(const MACROBLOCKD *xd, TX_SIZE tx_size,
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PLANE_TYPE type, int block_idx) {
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const MODE_INFO *const mi = xd->mi[0];
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if (is_inter_block(&mi->mbmi) || type != PLANE_TYPE_Y || xd->lossless) {
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return &vp9_default_scan_orders[tx_size];
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} else {
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const PREDICTION_MODE mode = get_y_mode(mi, block_idx);
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return &vp9_scan_orders[tx_size][intra_mode_to_tx_type_lookup[mode]];
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}
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VP9_COMMON_VP9_SCAN_H_
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