/* * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> * Copyright (c) 2010 Mans Rullgard <mans@mansr.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> #include "libavutil/attributes.h" #include "avcodec.h" #include "vp56dsp.h" #include "libavutil/common.h" /* Gives very similar result than the vp6 version except in a few cases */ static int vp5_adjust(int v, int t) { int s2, s1 = v >> 31; v ^= s1; v -= s1; v *= v < 2*t; v -= t; s2 = v >> 31; v ^= s2; v -= s2; v = t - v; v += s1; v ^= s1; return v; } static int vp6_adjust(int v, int t) { int V = v, s = v >> 31; V ^= s; V -= s; if (V-t-1 >= (unsigned)(t-1)) return v; V = 2*t - V; V += s; V ^= s; return V; } #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc) \ static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t) \ { \ int pix2_inc = 2 * pix_inc; \ int i, v; \ \ for (i=0; i<12; i++) { \ v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\ v = pfx##_adjust(v, t); \ yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v); \ yuv[0] = av_clip_uint8(yuv[0] - v); \ yuv += line_inc; \ } \ } VP56_EDGE_FILTER(vp5, hor, 1, stride) VP56_EDGE_FILTER(vp5, ver, stride, 1) VP56_EDGE_FILTER(vp6, hor, 1, stride) VP56_EDGE_FILTER(vp6, ver, stride, 1) av_cold void ff_vp56dsp_init(VP56DSPContext *s, enum AVCodecID codec) { if (codec == AV_CODEC_ID_VP5) { s->edge_filter_hor = vp5_edge_filter_hor; s->edge_filter_ver = vp5_edge_filter_ver; } else { s->edge_filter_hor = vp6_edge_filter_hor; s->edge_filter_ver = vp6_edge_filter_ver; if (CONFIG_VP6_DECODER) { s->vp6_filter_diag4 = ff_vp6_filter_diag4_c; if (ARCH_ARM) ff_vp6dsp_init_arm(s, codec); if (ARCH_X86) ff_vp6dsp_init_x86(s, codec); } } }