1 /* 2 * Copyright (c) 2010 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 #include <assert.h> 12 13 #include "vp9/common/vp9_filter.h" 14 15 const InterpKernel vp9_bilinear_filters[SUBPEL_SHIFTS] = { 16 { 0, 0, 0, 128, 0, 0, 0, 0 }, 17 { 0, 0, 0, 120, 8, 0, 0, 0 }, 18 { 0, 0, 0, 112, 16, 0, 0, 0 }, 19 { 0, 0, 0, 104, 24, 0, 0, 0 }, 20 { 0, 0, 0, 96, 32, 0, 0, 0 }, 21 { 0, 0, 0, 88, 40, 0, 0, 0 }, 22 { 0, 0, 0, 80, 48, 0, 0, 0 }, 23 { 0, 0, 0, 72, 56, 0, 0, 0 }, 24 { 0, 0, 0, 64, 64, 0, 0, 0 }, 25 { 0, 0, 0, 56, 72, 0, 0, 0 }, 26 { 0, 0, 0, 48, 80, 0, 0, 0 }, 27 { 0, 0, 0, 40, 88, 0, 0, 0 }, 28 { 0, 0, 0, 32, 96, 0, 0, 0 }, 29 { 0, 0, 0, 24, 104, 0, 0, 0 }, 30 { 0, 0, 0, 16, 112, 0, 0, 0 }, 31 { 0, 0, 0, 8, 120, 0, 0, 0 } 32 }; 33 34 // Lagrangian interpolation filter 35 const InterpKernel vp9_sub_pel_filters_8[SUBPEL_SHIFTS] = { 36 { 0, 0, 0, 128, 0, 0, 0, 0}, 37 { 0, 1, -5, 126, 8, -3, 1, 0}, 38 { -1, 3, -10, 122, 18, -6, 2, 0}, 39 { -1, 4, -13, 118, 27, -9, 3, -1}, 40 { -1, 4, -16, 112, 37, -11, 4, -1}, 41 { -1, 5, -18, 105, 48, -14, 4, -1}, 42 { -1, 5, -19, 97, 58, -16, 5, -1}, 43 { -1, 6, -19, 88, 68, -18, 5, -1}, 44 { -1, 6, -19, 78, 78, -19, 6, -1}, 45 { -1, 5, -18, 68, 88, -19, 6, -1}, 46 { -1, 5, -16, 58, 97, -19, 5, -1}, 47 { -1, 4, -14, 48, 105, -18, 5, -1}, 48 { -1, 4, -11, 37, 112, -16, 4, -1}, 49 { -1, 3, -9, 27, 118, -13, 4, -1}, 50 { 0, 2, -6, 18, 122, -10, 3, -1}, 51 { 0, 1, -3, 8, 126, -5, 1, 0} 52 }; 53 54 // DCT based filter 55 const InterpKernel vp9_sub_pel_filters_8s[SUBPEL_SHIFTS] = { 56 {0, 0, 0, 128, 0, 0, 0, 0}, 57 {-1, 3, -7, 127, 8, -3, 1, 0}, 58 {-2, 5, -13, 125, 17, -6, 3, -1}, 59 {-3, 7, -17, 121, 27, -10, 5, -2}, 60 {-4, 9, -20, 115, 37, -13, 6, -2}, 61 {-4, 10, -23, 108, 48, -16, 8, -3}, 62 {-4, 10, -24, 100, 59, -19, 9, -3}, 63 {-4, 11, -24, 90, 70, -21, 10, -4}, 64 {-4, 11, -23, 80, 80, -23, 11, -4}, 65 {-4, 10, -21, 70, 90, -24, 11, -4}, 66 {-3, 9, -19, 59, 100, -24, 10, -4}, 67 {-3, 8, -16, 48, 108, -23, 10, -4}, 68 {-2, 6, -13, 37, 115, -20, 9, -4}, 69 {-2, 5, -10, 27, 121, -17, 7, -3}, 70 {-1, 3, -6, 17, 125, -13, 5, -2}, 71 {0, 1, -3, 8, 127, -7, 3, -1} 72 }; 73 74 // freqmultiplier = 0.5 75 const InterpKernel vp9_sub_pel_filters_8lp[SUBPEL_SHIFTS] = { 76 { 0, 0, 0, 128, 0, 0, 0, 0}, 77 {-3, -1, 32, 64, 38, 1, -3, 0}, 78 {-2, -2, 29, 63, 41, 2, -3, 0}, 79 {-2, -2, 26, 63, 43, 4, -4, 0}, 80 {-2, -3, 24, 62, 46, 5, -4, 0}, 81 {-2, -3, 21, 60, 49, 7, -4, 0}, 82 {-1, -4, 18, 59, 51, 9, -4, 0}, 83 {-1, -4, 16, 57, 53, 12, -4, -1}, 84 {-1, -4, 14, 55, 55, 14, -4, -1}, 85 {-1, -4, 12, 53, 57, 16, -4, -1}, 86 { 0, -4, 9, 51, 59, 18, -4, -1}, 87 { 0, -4, 7, 49, 60, 21, -3, -2}, 88 { 0, -4, 5, 46, 62, 24, -3, -2}, 89 { 0, -4, 4, 43, 63, 26, -2, -2}, 90 { 0, -3, 2, 41, 63, 29, -2, -2}, 91 { 0, -3, 1, 38, 64, 32, -1, -3} 92 }; 93 94 95 static const InterpKernel* vp9_filter_kernels[4] = { 96 vp9_sub_pel_filters_8, 97 vp9_sub_pel_filters_8lp, 98 vp9_sub_pel_filters_8s, 99 vp9_bilinear_filters 100 }; 101 102 const InterpKernel *vp9_get_interp_kernel(INTERP_FILTER filter) { 103 assert(filter != SWITCHABLE); 104 return vp9_filter_kernels[filter]; 105 } 106 107
