1 /* 2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef VP9_COMMON_VP9_SCAN_H_ 12 #define VP9_COMMON_VP9_SCAN_H_ 13 14 #include "vpx/vpx_integer.h" 15 #include "vpx_ports/mem.h" 16 17 #include "vp9/common/vp9_enums.h" 18 #include "vp9/common/vp9_blockd.h" 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 #define MAX_NEIGHBORS 2 25 26 void vp9_init_neighbors(); 27 28 typedef struct { 29 const int16_t *scan; 30 const int16_t *iscan; 31 const int16_t *neighbors; 32 } scan_order; 33 34 extern const scan_order vp9_default_scan_orders[TX_SIZES]; 35 extern const scan_order vp9_scan_orders[TX_SIZES][TX_TYPES]; 36 37 static INLINE int get_coef_context(const int16_t *neighbors, 38 const uint8_t *token_cache, int c) { 39 return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] + 40 token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >> 1; 41 } 42 43 #ifdef __cplusplus 44 } // extern "C" 45 #endif 46 47 #endif // VP9_COMMON_VP9_SCAN_H_ 48
