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 24#include "libavutil/attributes.h" 25#include "avcodec.h" 26#include "vp56dsp.h" 27#include "libavutil/common.h" 28 29/* Gives very similar result than the vp6 version except in a few cases */ 30static int vp5_adjust(int v, int t) 31{ 32 int s2, s1 = v >> 31; 33 v ^= s1; 34 v -= s1; 35 v *= v < 2*t; 36 v -= t; 37 s2 = v >> 31; 38 v ^= s2; 39 v -= s2; 40 v = t - v; 41 v += s1; 42 v ^= s1; 43 return v; 44} 45 46static int vp6_adjust(int v, int t) 47{ 48 int V = v, s = v >> 31; 49 V ^= s; 50 V -= s; 51 if (V-t-1 >= (unsigned)(t-1)) 52 return v; 53 V = 2*t - V; 54 V += s; 55 V ^= s; 56 return V; 57} 58 59 60#define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc) \ 61static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t) \ 62{ \ 63 int pix2_inc = 2 * pix_inc; \ 64 int i, v; \ 65 \ 66 for (i=0; i<12; i++) { \ 67 v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\ 68 v = pfx##_adjust(v, t); \ 69 yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v); \ 70 yuv[0] = av_clip_uint8(yuv[0] - v); \ 71 yuv += line_inc; \ 72 } \ 73} 74 75VP56_EDGE_FILTER(vp5, hor, 1, stride) 76VP56_EDGE_FILTER(vp5, ver, stride, 1) 77VP56_EDGE_FILTER(vp6, hor, 1, stride) 78VP56_EDGE_FILTER(vp6, ver, stride, 1) 79 80av_cold void ff_vp56dsp_init(VP56DSPContext *s, enum AVCodecID codec) 81{ 82 if (codec == AV_CODEC_ID_VP5) { 83 s->edge_filter_hor = vp5_edge_filter_hor; 84 s->edge_filter_ver = vp5_edge_filter_ver; 85 } else { 86 s->edge_filter_hor = vp6_edge_filter_hor; 87 s->edge_filter_ver = vp6_edge_filter_ver; 88 89 if (CONFIG_VP6_DECODER) { 90 s->vp6_filter_diag4 = ff_vp6_filter_diag4_c; 91 92 if (ARCH_ARM) 93 ff_vp6dsp_init_arm(s, codec); 94 if (ARCH_X86) 95 ff_vp6dsp_init_x86(s, codec); 96 } 97 } 98} 99