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/*
* 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 "avcodec.h"
#include "vp56dsp.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)
void ff_vp56dsp_init(VP56DSPContext *s, enum CodecID codec)
{
if (codec == 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;
}
}
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