ref: 6ad061de58b88b157fa0b83eb06405c52071f1ec
dir: /vp9/common/vp9_filter.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdlib.h>
#include "vp9/common/vp9_filter.h"
#include "vpx_ports/mem.h"
#include "vp9_rtcd.h"
#include "vp9/common/vp9_common.h"
DECLARE_ALIGNED(256, const int16_t, vp9_bilinear_filters[SUBPEL_SHIFTS][8]) = {
{ 0, 0, 0, 128, 0, 0, 0, 0 },
{ 0, 0, 0, 120, 8, 0, 0, 0 },
{ 0, 0, 0, 112, 16, 0, 0, 0 },
{ 0, 0, 0, 104, 24, 0, 0, 0 },
{ 0, 0, 0, 96, 32, 0, 0, 0 },
{ 0, 0, 0, 88, 40, 0, 0, 0 },
{ 0, 0, 0, 80, 48, 0, 0, 0 },
{ 0, 0, 0, 72, 56, 0, 0, 0 },
{ 0, 0, 0, 64, 64, 0, 0, 0 },
{ 0, 0, 0, 56, 72, 0, 0, 0 },
{ 0, 0, 0, 48, 80, 0, 0, 0 },
{ 0, 0, 0, 40, 88, 0, 0, 0 },
{ 0, 0, 0, 32, 96, 0, 0, 0 },
{ 0, 0, 0, 24, 104, 0, 0, 0 },
{ 0, 0, 0, 16, 112, 0, 0, 0 },
{ 0, 0, 0, 8, 120, 0, 0, 0 }
};
#define FILTER_ALPHA 0
#define FILTER_ALPHA_SHARP 0
#define FILTER_ALPHA_SMOOTH 50
DECLARE_ALIGNED(256, const int16_t, vp9_sub_pel_filters_8[SUBPEL_SHIFTS][8])
= {
#if FILTER_ALPHA == 0
/* Lagrangian interpolation filter */
{ 0, 0, 0, 128, 0, 0, 0, 0},
{ 0, 1, -5, 126, 8, -3, 1, 0},
{ -1, 3, -10, 122, 18, -6, 2, 0},
{ -1, 4, -13, 118, 27, -9, 3, -1},
{ -1, 4, -16, 112, 37, -11, 4, -1},
{ -1, 5, -18, 105, 48, -14, 4, -1},
{ -1, 5, -19, 97, 58, -16, 5, -1},
{ -1, 6, -19, 88, 68, -18, 5, -1},
{ -1, 6, -19, 78, 78, -19, 6, -1},
{ -1, 5, -18, 68, 88, -19, 6, -1},
{ -1, 5, -16, 58, 97, -19, 5, -1},
{ -1, 4, -14, 48, 105, -18, 5, -1},
{ -1, 4, -11, 37, 112, -16, 4, -1},
{ -1, 3, -9, 27, 118, -13, 4, -1},
{ 0, 2, -6, 18, 122, -10, 3, -1},
{ 0, 1, -3, 8, 126, -5, 1, 0}
#elif FILTER_ALPHA == 50
/* Generated using MATLAB:
* alpha = 0.5;
* b=intfilt(8,4,alpha);
* bi=round(128*b);
* ba=flipud(reshape([bi 0], 8, 8));
* disp(num2str(ba, '%d,'))
*/
{ 0, 0, 0, 128, 0, 0, 0, 0},
{ 0, 1, -5, 126, 8, -3, 1, 0},
{ 0, 2, -10, 122, 18, -6, 2, 0},
{ -1, 3, -13, 118, 27, -9, 3, 0},
{ -1, 4, -16, 112, 37, -11, 3, 0},
{ -1, 5, -17, 104, 48, -14, 4, -1},
{ -1, 5, -18, 96, 58, -16, 5, -1},
{ -1, 5, -19, 88, 68, -17, 5, -1},
{ -1, 5, -18, 78, 78, -18, 5, -1},
{ -1, 5, -17, 68, 88, -19, 5, -1},
{ -1, 5, -16, 58, 96, -18, 5, -1},
{ -1, 4, -14, 48, 104, -17, 5, -1},
{ 0, 3, -11, 37, 112, -16, 4, -1},
{ 0, 3, -9, 27, 118, -13, 3, -1},
{ 0, 2, -6, 18, 122, -10, 2, 0},
{ 0, 1, -3, 8, 126, -5, 1, 0}
#endif /* FILTER_ALPHA */
};
DECLARE_ALIGNED(256, const int16_t, vp9_sub_pel_filters_8s[SUBPEL_SHIFTS][8])
= {
#if FILTER_ALPHA_SHARP == 0
/* dct based filter */
{0, 0, 0, 128, 0, 0, 0, 0},
{-1, 3, -7, 127, 8, -3, 1, 0},
{-2, 5, -13, 125, 17, -6, 3, -1},
{-3, 7, -17, 121, 27, -10, 5, -2},
{-4, 9, -20, 115, 37, -13, 6, -2},
{-4, 10, -23, 108, 48, -16, 8, -3},
{-4, 10, -24, 100, 59, -19, 9, -3},
{-4, 11, -24, 90, 70, -21, 10, -4},
{-4, 11, -23, 80, 80, -23, 11, -4},
{-4, 10, -21, 70, 90, -24, 11, -4},
{-3, 9, -19, 59, 100, -24, 10, -4},
{-3, 8, -16, 48, 108, -23, 10, -4},
{-2, 6, -13, 37, 115, -20, 9, -4},
{-2, 5, -10, 27, 121, -17, 7, -3},
{-1, 3, -6, 17, 125, -13, 5, -2},
{0, 1, -3, 8, 127, -7, 3, -1}
#elif FILTER_ALPHA_SHARP == 80
/* alpha = 0.80 */
{ 0, 0, 0, 128, 0, 0, 0, 0},
{-1, 2, -6, 127, 9, -4, 2, -1},
{-2, 5, -12, 124, 18, -7, 4, -2},
{-2, 7, -16, 119, 28, -11, 5, -2},
{-3, 8, -19, 114, 38, -14, 7, -3},
{-3, 9, -22, 107, 49, -17, 8, -3},
{-4, 10, -23, 99, 60, -20, 10, -4},
{-4, 11, -23, 90, 70, -22, 10, -4},
{-4, 11, -23, 80, 80, -23, 11, -4},
{-4, 10, -22, 70, 90, -23, 11, -4},
{-4, 10, -20, 60, 99, -23, 10, -4},
{-3, 8, -17, 49, 107, -22, 9, -3},
{-3, 7, -14, 38, 114, -19, 8, -3},
{-2, 5, -11, 28, 119, -16, 7, -2},
{-2, 4, -7, 18, 124, -12, 5, -2},
{-1, 2, -4, 9, 127, -6, 2, -1}
#endif /* FILTER_ALPHA_SHARP */
};
DECLARE_ALIGNED(256, const int16_t,
vp9_sub_pel_filters_8lp[SUBPEL_SHIFTS][8]) = {
/* 8-tap lowpass filter */
/* Hamming window */
/* freqmultiplier = 0.625 */
#if FILTER_ALPHA_SMOOTH == 625
{-1, -7, 32, 80, 32, -7, -1, 0},
{-1, -8, 28, 80, 37, -7, -2, 1},
{ 0, -8, 24, 79, 41, -7, -2, 1},
{ 0, -8, 20, 78, 45, -5, -3, 1},
{ 0, -8, 16, 76, 50, -4, -3, 1},
{ 0, -7, 13, 74, 54, -3, -4, 1},
{ 1, -7, 9, 71, 58, -1, -4, 1},
{ 1, -6, 6, 68, 62, 1, -5, 1},
{ 1, -6, 4, 65, 65, 4, -6, 1},
{ 1, -5, 1, 62, 68, 6, -6, 1},
{ 1, -4, -1, 58, 71, 9, -7, 1},
{ 1, -4, -3, 54, 74, 13, -7, 0},
{ 1, -3, -4, 50, 76, 16, -8, 0},
{ 1, -3, -5, 45, 78, 20, -8, 0},
{ 1, -2, -7, 41, 79, 24, -8, 0},
{ 1, -2, -7, 37, 80, 28, -8, -1}
#elif FILTER_ALPHA_SMOOTH == 50
/* freqmultiplier = 0.5 */
{-3, 0, 35, 64, 35, 0, -3, 0},
{-3, -1, 32, 64, 38, 1, -3, 0},
{-2, -2, 29, 63, 41, 2, -3, 0},
{-2, -2, 26, 63, 43, 4, -4, 0},
{-2, -3, 24, 62, 46, 5, -4, 0},
{-2, -3, 21, 60, 49, 7, -4, 0},
{-1, -4, 18, 59, 51, 9, -4, 0},
{-1, -4, 16, 57, 53, 12, -4, -1},
{-1, -4, 14, 55, 55, 14, -4, -1},
{-1, -4, 12, 53, 57, 16, -4, -1},
{0, -4, 9, 51, 59, 18, -4, -1},
{0, -4, 7, 49, 60, 21, -3, -2},
{0, -4, 5, 46, 62, 24, -3, -2},
{0, -4, 4, 43, 63, 26, -2, -2},
{0, -3, 2, 41, 63, 29, -2, -2},
{0, -3, 1, 38, 64, 32, -1, -3}
#endif
};
DECLARE_ALIGNED(256, const int16_t, vp9_sub_pel_filters_6[SUBPEL_SHIFTS][8])
= {
{0, 0, 0, 128, 0, 0, 0, 0},
{0, 1, -5, 125, 8, -2, 1, 0},
{0, 1, -8, 122, 17, -5, 1, 0},
{0, 2, -11, 116, 27, -8, 2, 0},
{0, 3, -14, 110, 37, -10, 2, 0},
{0, 3, -15, 103, 47, -12, 2, 0},
{0, 3, -16, 95, 57, -14, 3, 0},
{0, 3, -16, 86, 67, -15, 3, 0},
{0, 3, -16, 77, 77, -16, 3, 0},
{0, 3, -15, 67, 86, -16, 3, 0},
{0, 3, -14, 57, 95, -16, 3, 0},
{0, 2, -12, 47, 103, -15, 3, 0},
{0, 2, -10, 37, 110, -14, 3, 0},
{0, 2, -8, 27, 116, -11, 2, 0},
{0, 1, -5, 17, 122, -8, 1, 0},
{0, 1, -2, 8, 125, -5, 1, 0}
};