1 /* 2 * Copyright (c) 2015 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 VPX_DSP_VPX_FILTER_H_ 12 #define VPX_DSP_VPX_FILTER_H_ 13 14 #include "vpx/vpx_integer.h" 15 16 #ifdef __cplusplus 17 extern "C" { 18 #endif 19 20 #define FILTER_BITS 7 21 22 #define SUBPEL_BITS 4 23 #define SUBPEL_MASK ((1 << SUBPEL_BITS) - 1) 24 #define SUBPEL_SHIFTS (1 << SUBPEL_BITS) 25 #define SUBPEL_TAPS 8 26 27 typedef int16_t InterpKernel[SUBPEL_TAPS]; 28 29 static INLINE const InterpKernel *get_filter_base(const int16_t *filter) { 30 // NOTE: This assumes that the filter table is 256-byte aligned. 31 // TODO(agrange) Modify to make independent of table alignment. 32 return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF)); 33 } 34 35 static INLINE int get_filter_offset(const int16_t *f, 36 const InterpKernel *base) { 37 return (int)((const InterpKernel *)(intptr_t)f - base); 38 } 39 40 #ifdef __cplusplus 41 } // extern "C" 42 #endif 43 44 #endif // VPX_DSP_VPX_FILTER_H_ 45
