yading@10: /*
yading@10:  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
yading@10:  * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include "avcodec.h"
yading@10: #include "vp56dsp.h"
yading@10: #include "libavutil/common.h"
yading@10: 
yading@10: /* Gives very similar result than the vp6 version except in a few cases */
yading@10: static int vp5_adjust(int v, int t)
yading@10: {
yading@10:     int s2, s1 = v >> 31;
yading@10:     v ^= s1;
yading@10:     v -= s1;
yading@10:     v *= v < 2*t;
yading@10:     v -= t;
yading@10:     s2 = v >> 31;
yading@10:     v ^= s2;
yading@10:     v -= s2;
yading@10:     v = t - v;
yading@10:     v += s1;
yading@10:     v ^= s1;
yading@10:     return v;
yading@10: }
yading@10: 
yading@10: static int vp6_adjust(int v, int t)
yading@10: {
yading@10:     int V = v, s = v >> 31;
yading@10:     V ^= s;
yading@10:     V -= s;
yading@10:     if (V-t-1 >= (unsigned)(t-1))
yading@10:         return v;
yading@10:     V = 2*t - V;
yading@10:     V += s;
yading@10:     V ^= s;
yading@10:     return V;
yading@10: }
yading@10: 
yading@10: 
yading@10: #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
yading@10: static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t)    \
yading@10: {                                                                       \
yading@10:     int pix2_inc = 2 * pix_inc;                                         \
yading@10:     int i, v;                                                           \
yading@10:                                                                         \
yading@10:     for (i=0; i<12; i++) {                                              \
yading@10:         v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
yading@10:         v = pfx##_adjust(v, t);                                         \
yading@10:         yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
yading@10:         yuv[0] = av_clip_uint8(yuv[0] - v);                             \
yading@10:         yuv += line_inc;                                                \
yading@10:     }                                                                   \
yading@10: }
yading@10: 
yading@10: VP56_EDGE_FILTER(vp5, hor, 1, stride)
yading@10: VP56_EDGE_FILTER(vp5, ver, stride, 1)
yading@10: VP56_EDGE_FILTER(vp6, hor, 1, stride)
yading@10: VP56_EDGE_FILTER(vp6, ver, stride, 1)
yading@10: 
yading@10: void ff_vp56dsp_init(VP56DSPContext *s, enum AVCodecID codec)
yading@10: {
yading@10:     if (codec == AV_CODEC_ID_VP5) {
yading@10:         s->edge_filter_hor = vp5_edge_filter_hor;
yading@10:         s->edge_filter_ver = vp5_edge_filter_ver;
yading@10:     } else {
yading@10:         s->edge_filter_hor = vp6_edge_filter_hor;
yading@10:         s->edge_filter_ver = vp6_edge_filter_ver;
yading@10: 
yading@10:         if (CONFIG_VP6_DECODER) {
yading@10:             s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (ARCH_ARM) ff_vp56dsp_init_arm(s, codec);
yading@10:     if (ARCH_X86) ff_vp56dsp_init_x86(s, codec);
yading@10: }