1/* 2 * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> 3 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <stdint.h> 23#include "avcodec.h" 24#include "vp56dsp.h" 25 26/* Gives very similar result than the vp6 version except in a few cases */ 27static int vp5_adjust(int v, int t) 28{ 29 int s2, s1 = v >> 31; 30 v ^= s1; 31 v -= s1; 32 v *= v < 2*t; 33 v -= t; 34 s2 = v >> 31; 35 v ^= s2; 36 v -= s2; 37 v = t - v; 38 v += s1; 39 v ^= s1; 40 return v; 41} 42 43static int vp6_adjust(int v, int t) 44{ 45 int V = v, s = v >> 31; 46 V ^= s; 47 V -= s; 48 if (V-t-1 >= (unsigned)(t-1)) 49 return v; 50 V = 2*t - V; 51 V += s; 52 V ^= s; 53 return V; 54} 55 56 57#define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc) \ 58static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t) \ 59{ \ 60 int pix2_inc = 2 * pix_inc; \ 61 int i, v; \ 62 \ 63 for (i=0; i<12; i++) { \ 64 v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\ 65 v = pfx##_adjust(v, t); \ 66 yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v); \ 67 yuv[0] = av_clip_uint8(yuv[0] - v); \ 68 yuv += line_inc; \ 69 } \ 70} 71 72VP56_EDGE_FILTER(vp5, hor, 1, stride) 73VP56_EDGE_FILTER(vp5, ver, stride, 1) 74VP56_EDGE_FILTER(vp6, hor, 1, stride) 75VP56_EDGE_FILTER(vp6, ver, stride, 1) 76 77void ff_vp56dsp_init(VP56DSPContext *s, enum CodecID codec) 78{ 79 if (codec == CODEC_ID_VP5) { 80 s->edge_filter_hor = vp5_edge_filter_hor; 81 s->edge_filter_ver = vp5_edge_filter_ver; 82 } else { 83 s->edge_filter_hor = vp6_edge_filter_hor; 84 s->edge_filter_ver = vp6_edge_filter_ver; 85 } 86 87 if (ARCH_ARM) ff_vp56dsp_init_arm(s, codec); 88} 89