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ffmpeg / libavcodec / vp56dsp.c @ 2912e87a

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/*
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 * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <stdint.h>
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#include "avcodec.h"
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#include "vp56dsp.h"
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/* Gives very similar result than the vp6 version except in a few cases */
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static int vp5_adjust(int v, int t)
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{
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    int s2, s1 = v >> 31;
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    v ^= s1;
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    v -= s1;
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    v *= v < 2*t;
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    v -= t;
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    s2 = v >> 31;
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    v ^= s2;
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    v -= s2;
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    v = t - v;
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    v += s1;
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    v ^= s1;
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    return v;
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}
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static int vp6_adjust(int v, int t)
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{
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    int V = v, s = v >> 31;
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    V ^= s;
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    V -= s;
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    if (V-t-1 >= (unsigned)(t-1))
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        return v;
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    V = 2*t - V;
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    V += s;
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    V ^= s;
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    return V;
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}
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#define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
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static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t)    \
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{                                                                       \
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    int pix2_inc = 2 * pix_inc;                                         \
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    int i, v;                                                           \
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                                                                        \
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    for (i=0; i<12; i++) {                                              \
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        v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
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        v = pfx##_adjust(v, t);                                         \
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        yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
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        yuv[0] = av_clip_uint8(yuv[0] - v);                             \
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        yuv += line_inc;                                                \
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    }                                                                   \
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}
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VP56_EDGE_FILTER(vp5, hor, 1, stride)
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VP56_EDGE_FILTER(vp5, ver, stride, 1)
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VP56_EDGE_FILTER(vp6, hor, 1, stride)
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VP56_EDGE_FILTER(vp6, ver, stride, 1)
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void ff_vp56dsp_init(VP56DSPContext *s, enum CodecID codec)
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{
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    if (codec == CODEC_ID_VP5) {
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        s->edge_filter_hor = vp5_edge_filter_hor;
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        s->edge_filter_ver = vp5_edge_filter_ver;
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    } else {
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        s->edge_filter_hor = vp6_edge_filter_hor;
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        s->edge_filter_ver = vp6_edge_filter_ver;
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        if (CONFIG_VP6_DECODER) {
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            s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
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        }
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    }
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    if (ARCH_ARM) ff_vp56dsp_init_arm(s, codec);
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    if (HAVE_MMX) ff_vp56dsp_init_x86(s, codec);
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}