1 /* 2 * Copyright (c) 2011 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_FILTER_H_ 12 #define VP9_COMMON_VP9_FILTER_H_ 13 14 #include "./vpx_config.h" 15 #include "vpx/vpx_integer.h" 16 #include "vpx_ports/mem.h" 17 18 19 #ifdef __cplusplus 20 extern "C" { 21 #endif 22 23 #define FILTER_BITS 7 24 25 #define SUBPEL_BITS 4 26 #define SUBPEL_MASK ((1 << SUBPEL_BITS) - 1) 27 #define SUBPEL_SHIFTS (1 << SUBPEL_BITS) 28 #define SUBPEL_TAPS 8 29 30 typedef enum { 31 EIGHTTAP = 0, 32 EIGHTTAP_SMOOTH = 1, 33 EIGHTTAP_SHARP = 2, 34 BILINEAR = 3, 35 SWITCHABLE = 4 /* should be the last one */ 36 } INTERP_FILTER; 37 38 typedef int16_t InterpKernel[SUBPEL_TAPS]; 39 40 const InterpKernel *vp9_get_interp_kernel(INTERP_FILTER filter); 41 42 DECLARE_ALIGNED(256, extern const InterpKernel, 43 vp9_bilinear_filters[SUBPEL_SHIFTS]); 44 DECLARE_ALIGNED(256, extern const InterpKernel, 45 vp9_sub_pel_filters_8[SUBPEL_SHIFTS]); 46 DECLARE_ALIGNED(256, extern const InterpKernel, 47 vp9_sub_pel_filters_8s[SUBPEL_SHIFTS]); 48 DECLARE_ALIGNED(256, extern const InterpKernel, 49 vp9_sub_pel_filters_8lp[SUBPEL_SHIFTS]); 50 51 // The VP9_BILINEAR_FILTERS_2TAP macro returns a pointer to the bilinear 52 // filter kernel as a 2 tap filter. 53 #define BILINEAR_FILTERS_2TAP(x) \ 54 (vp9_bilinear_filters[(x)] + SUBPEL_TAPS/2 - 1) 55 56 #ifdef __cplusplus 57 } // extern "C" 58 #endif 59 60 #endif // VP9_COMMON_VP9_FILTER_H_ 61
