vlc/modules/video_filter/deinterlace/yadif.h

/*
 * Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 */

#ifdef HAVE_CONFIG_H
#   include "config.h"
#endif

#if defined(__GNUC__)
#  define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
#  if VLC_GCC_VERSION(3,1)
#    define DECLARE_ASM_CONST(n,t,v)    static const t __attribute__((used)) __attribute__ ((aligned (n))) v
#  else
#    define DECLARE_ASM_CONST(n,t,v)    static const t __attribute__ ((aligned (n))) v
#  endif
#endif

typedef intptr_t x86_reg;
typedef struct { uint64_t a, b; } xmm_reg;

DECLARE_ASM_CONST(16, const xmm_reg, pb_1) = {0x0101010101010101ULL, 0x0101010101010101ULL};
DECLARE_ASM_CONST(16, const xmm_reg, pw_1) = {0x0001000100010001ULL, 0x0001000100010001ULL};


#ifdef CAN_COMPILE_SSSE3
#if defined(__SSE__) || VLC_GCC_VERSION(4, 4)
// ================ SSSE3 =================
#define HAVE_YADIF_SSSE3
#define COMPILE_TEMPLATE_SSE 1
#define COMPILE_TEMPLATE_SSSE3 1
#define VLC_TARGET VLC_SSE
#define RENAME(a) a ## _ssse3
#include "yadif_template.h"
#undef COMPILE_TEMPLATE_SSE
#undef COMPILE_TEMPLATE_SSSE3
#undef VLC_TARGET
#undef RENAME
#endif
#endif

#ifdef CAN_COMPILE_SSE2
#if defined(__SSE__) || VLC_GCC_VERSION(4, 4)
// ================= SSE2 =================
#define HAVE_YADIF_SSE2
#define COMPILE_TEMPLATE_SSE 1
#define VLC_TARGET VLC_SSE
#define RENAME(a) a ## _sse2
#include "yadif_template.h"
#undef COMPILE_TEMPLATE_SSE
#undef VLC_TARGET
#undef RENAME
#endif
#endif

#ifdef CAN_COMPILE_MMX
#if defined(__MMX__) || VLC_GCC_VERSION(4, 4)
// ================ MMX =================
#define HAVE_YADIF_MMX
#define VLC_TARGET VLC_MMX
#define RENAME(a) a ## _mmx
#include "yadif_template.h"
#undef VLC_TARGET
#undef RENAME
#endif
#endif

static void yadif_filter_line_c(uint8_t *dst, uint8_t *prev, uint8_t *cur, uint8_t *next, int w, int prefs, int mrefs, int parity, int mode) {
    int x;
    uint8_t *prev2= parity ? prev : cur ;
    uint8_t *next2= parity ? cur  : next;
    for(x=0; x<w; x++){
        int c= cur[mrefs];
        int d= (prev2[0] + next2[0])>>1;
        int e= cur[prefs];
        int temporal_diff0= FFABS(prev2[0] - next2[0]);
        int temporal_diff1=( FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e) )>>1;
        int temporal_diff2=( FFABS(next[mrefs] - c) + FFABS(next[prefs] - e) )>>1;
        int diff= FFMAX3(temporal_diff0>>1, temporal_diff1, temporal_diff2);
        int spatial_pred= (c+e)>>1;
        int spatial_score= FFABS(cur[mrefs-1] - cur[prefs-1]) + FFABS(c-e)
                         + FFABS(cur[mrefs+1] - cur[prefs+1]) - 1;

#define CHECK(j)\
    {   int score= FFABS(cur[mrefs-1+j] - cur[prefs-1-j])\
                 + FFABS(cur[mrefs  +j] - cur[prefs  -j])\
                 + FFABS(cur[mrefs+1+j] - cur[prefs+1-j]);\
        if(score < spatial_score){\
            spatial_score= score;\
            spatial_pred= (cur[mrefs  +j] + cur[prefs  -j])>>1;\

        CHECK(-1) CHECK(-2) }} }}
        CHECK( 1) CHECK( 2) }} }}

        if(mode<2){
            int b= (prev2[2*mrefs] + next2[2*mrefs])>>1;
            int f= (prev2[2*prefs] + next2[2*prefs])>>1;
#if 0
            int a= cur[3*mrefs];
            int g= cur[3*prefs];
            int max= FFMAX3(d-e, d-c, FFMIN3(FFMAX(b-c,f-e),FFMAX(b-c,b-a),FFMAX(f-g,f-e)) );
            int min= FFMIN3(d-e, d-c, FFMAX3(FFMIN(b-c,f-e),FFMIN(b-c,b-a),FFMIN(f-g,f-e)) );
#else
            int max= FFMAX3(d-e, d-c, FFMIN(b-c, f-e));
            int min= FFMIN3(d-e, d-c, FFMAX(b-c, f-e));
#endif

            diff= FFMAX3(diff, min, -max);
        }

        if(spatial_pred > d + diff)
           spatial_pred = d + diff;
        else if(spatial_pred < d - diff)
           spatial_pred = d - diff;

        dst[0] = spatial_pred;

        dst++;
        cur++;
        prev++;
        next++;
        prev2++;
        next2++;
    }
}