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   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * Copyright (c) 2011, 2012 Hyllian/Jararaca <sergiogdb@gmail.com>
   5  * Copyright (c) 2014 Arwa Arif <arwaarif1994@gmail.com>
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * XBR Filter is used for depixelization of image.
  25  * This is based on Hyllian's xBR shader.
  26  *
  27  * @see http://www.libretro.com/forums/viewtopic.php?f=6&t=134
  28  * @see https://github.com/yoyofr/iFBA/blob/master/fba_src/src/intf/video/scalers/xbr.cpp
  29  */
  30
  31 #include "libavutil/opt.h"
  32 #include "libavutil/avassert.h"
  33 #include "libavutil/pixdesc.h"
  34 #include "internal.h"
  35
  36 #define RGB_MASK      0x00FFFFFF
  37 #define LB_MASK       0x00FEFEFE
  38 #define RED_BLUE_MASK 0x00FF00FF
  39 #define GREEN_MASK    0x0000FF00
  40
  41 typedef int (*xbrfunc_t)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
  42
  43 typedef struct {
  44     const AVClass *class;
  45     int n;
  46     xbrfunc_t func;
  47     uint32_t rgbtoyuv[1<<24];
  48 } XBRContext;
  49
  50 typedef struct ThreadData {
  51     AVFrame *in, *out;
  52     const uint32_t *rgbtoyuv;
  53 } ThreadData;
  54
  55 #define OFFSET(x) offsetof(XBRContext, x)
  56 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  57 static const AVOption xbr_options[] = {
  58     { "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 4, .flags = FLAGS },
  59     { NULL }
  60 };
  61
  62 AVFILTER_DEFINE_CLASS(xbr);
  63
  64 static uint32_t pixel_diff(uint32_t x, uint32_t y, const uint32_t *r2y)
  65 {
  66 #define YMASK 0xff0000
  67 #define UMASK 0x00ff00
  68 #define VMASK 0x0000ff
  69
  70     uint32_t yuv1 = r2y[x & 0xffffff];
  71     uint32_t yuv2 = r2y[y & 0xffffff];
  72
  73     return (abs((yuv1 & YMASK) - (yuv2 & YMASK)) >> 16) +
  74            (abs((yuv1 & UMASK) - (yuv2 & UMASK)) >>  8) +
  75            abs((yuv1 & VMASK) - (yuv2 & VMASK));
  76 }
  77
  78 #define ALPHA_BLEND_128_W(dst, src) dst = ((src & LB_MASK) >> 1) + ((dst & LB_MASK) >> 1)
  79
  80 #define ALPHA_BLEND_32_W(dst, src) \
  81     dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
  82           (dst & RED_BLUE_MASK))) >> 3))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
  83           ((((src & GREEN_MASK) - (dst & GREEN_MASK))) >> 3))))
  84
  85 #define ALPHA_BLEND_64_W(dst, src) \
  86     dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
  87           (dst & RED_BLUE_MASK))) >> 2))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
  88           ((((src & GREEN_MASK) - (dst & GREEN_MASK))) >> 2))))
  89
  90 #define ALPHA_BLEND_192_W(dst, src) \
  91     dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
  92           (dst & RED_BLUE_MASK)) * 3) >> 2))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
  93           ((((src & GREEN_MASK) - (dst & GREEN_MASK)) * 3) >> 2))))
  94
  95 #define ALPHA_BLEND_224_W(dst, src) \
  96     dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
  97           (dst & RED_BLUE_MASK)) * 7) >> 3))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
  98           ((((src & GREEN_MASK) - (dst & GREEN_MASK)) * 7) >> 3))))
  99
 100 #define df(A, B) pixel_diff(A, B, r2y)
 101 #define eq(A, B) (df(A, B) < 155)
 102
 103 #define FILT2(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1,   \
 104               N0, N1, N2, N3) do {                                                                  \
 105     if (PE != PH && PE != PF) {                                                                     \
 106         const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2);          \
 107         const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2);          \
 108         if (e < i && (!eq(PF,PB) && !eq(PH,PD) || eq(PE,PI)                                         \
 109                       && (!eq(PF,I4) && !eq(PH,I5))                                                 \
 110                       || eq(PE,PG) || eq(PE,PC))) {                                                 \
 111             const unsigned ke = df(PF,PG);                                                          \
 112             const unsigned ki = df(PH,PC);                                                          \
 113             const int left    = ke<<1 <= ki && PE != PG && PD != PG;                                \
 114             const int up      = ke >= ki<<1 && PE != PC && PB != PC;                                \
 115             const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH;                                   \
 116             if (left && up) {                                                                       \
 117                 ALPHA_BLEND_224_W(E[N3], px);                                                       \
 118                 ALPHA_BLEND_64_W( E[N2], px);                                                       \
 119                 E[N1] = E[N2];                                                                      \
 120             } else if (left) {                                                                      \
 121                 ALPHA_BLEND_192_W(E[N3], px);                                                       \
 122                 ALPHA_BLEND_64_W( E[N2], px);                                                       \
 123             } else if (up) {                                                                        \
 124                 ALPHA_BLEND_192_W(E[N3], px);                                                       \
 125                 ALPHA_BLEND_64_W( E[N1], px);                                                       \
 126             } else { /* diagonal */                                                                 \
 127                 ALPHA_BLEND_128_W(E[N3], px);                                                       \
 128             }                                                                                       \
 129         } else if (e <= i) {                                                                        \
 130             ALPHA_BLEND_128_W( E[N3], ((df(PE,PF) <= df(PE,PH)) ? PF : PH));                        \
 131         }                                                                                           \
 132     }                                                                                               \
 133 } while (0)
 134
 135 #define FILT3(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1,   \
 136               N0, N1, N2, N3, N4, N5, N6, N7, N8) do {                                              \
 137     if (PE != PH && PE != PF) {                                                                     \
 138         const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2);          \
 139         const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2);          \
 140         if (e < i && (!eq(PF,PB) && !eq(PF,PC) || !eq(PH,PD) && !eq(PH,PG) || eq(PE,PI)             \
 141                       && (!eq(PF,F4) && !eq(PF,I4) || !eq(PH,H5) && !eq(PH,I5))                     \
 142                       || eq(PE,PG) || eq(PE,PC))) {                                                 \
 143             const unsigned ke = df(PF,PG);                                                          \
 144             const unsigned ki = df(PH,PC);                                                          \
 145             const int left    = ke<<1 <= ki && PE != PG && PD != PG;                                \
 146             const int up      = ke >= ki<<1 && PE != PC && PB != PC;                                \
 147             const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH;                                   \
 148             if (left && up) {                                                                       \
 149                 ALPHA_BLEND_192_W(E[N7], px);                                                       \
 150                 ALPHA_BLEND_64_W( E[N6], px);                                                       \
 151                 E[N5] = E[N7];                                                                      \
 152                 E[N2] = E[N6];                                                                      \
 153                 E[N8] = px;                                                                         \
 154             } else if (left) {                                                                      \
 155                 ALPHA_BLEND_192_W(E[N7], px);                                                       \
 156                 ALPHA_BLEND_64_W( E[N5], px);                                                       \
 157                 ALPHA_BLEND_64_W( E[N6], px);                                                       \
 158                 E[N8] = px;                                                                         \
 159             } else if (up) {                                                                        \
 160                 ALPHA_BLEND_192_W(E[N5], px);                                                       \
 161                 ALPHA_BLEND_64_W( E[N7], px);                                                       \
 162                 ALPHA_BLEND_64_W( E[N2], px);                                                       \
 163                 E[N8] = px;                                                                         \
 164             } else { /* diagonal */                                                                 \
 165                 ALPHA_BLEND_224_W(E[N8], px);                                                       \
 166                 ALPHA_BLEND_32_W( E[N5], px);                                                       \
 167                 ALPHA_BLEND_32_W( E[N7], px);                                                       \
 168             }                                                                                       \
 169         } else if (e <= i) {                                                                        \
 170             ALPHA_BLEND_128_W(E[N8], ((df(PE,PF) <= df(PE,PH)) ? PF : PH));                         \
 171         }                                                                                           \
 172     }                                                                                               \
 173 } while (0)
 174
 175 #define FILT4(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1,   \
 176               N15, N14, N11, N3, N7, N10, N13, N12, N9, N6, N2, N1, N5, N8, N4, N0) do {            \
 177     if (PE != PH && PE != PF) {                                                                     \
 178         const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2);          \
 179         const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2);          \
 180         if (e < i && (!eq(PF,PB) && !eq(PH,PD) || eq(PE,PI)                                         \
 181                       && (!eq(PF,I4) && !eq(PH,I5))                                                 \
 182                       || eq(PE,PG) || eq(PE,PC))) {                                                 \
 183             const unsigned ke = df(PF,PG);                                                          \
 184             const unsigned ki = df(PH,PC);                                                          \
 185             const int left    = ke<<1 <= ki && PE != PG && PD != PG;                                \
 186             const int up      = ke >= ki<<1 && PE != PC && PB != PC;                                \
 187             const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH;                                   \
 188             if (left && up) {                                                                       \
 189                 ALPHA_BLEND_192_W(E[N13], px);                                                      \
 190                 ALPHA_BLEND_64_W( E[N12], px);                                                      \
 191                 E[N15] = E[N14] = E[N11] = px;                                                      \
 192                 E[N10] = E[N3]  = E[N12];                                                           \
 193                 E[N7]  = E[N13];                                                                    \
 194             } else if (left) {                                                                      \
 195                 ALPHA_BLEND_192_W(E[N11], px);                                                      \
 196                 ALPHA_BLEND_192_W(E[N13], px);                                                      \
 197                 ALPHA_BLEND_64_W( E[N10], px);                                                      \
 198                 ALPHA_BLEND_64_W( E[N12], px);                                                      \
 199                 E[N14] = px;                                                                        \
 200                 E[N15] = px;                                                                        \
 201             } else if (up) {                                                                        \
 202                 ALPHA_BLEND_192_W(E[N14], px);                                                      \
 203                 ALPHA_BLEND_192_W(E[N7 ], px);                                                      \
 204                 ALPHA_BLEND_64_W( E[N10], px);                                                      \
 205                 ALPHA_BLEND_64_W( E[N3 ], px);                                                      \
 206                 E[N11] = px;                                                                        \
 207                 E[N15] = px;                                                                        \
 208             } else { /* diagonal */                                                                 \
 209                 ALPHA_BLEND_128_W(E[N11], px);                                                      \
 210                 ALPHA_BLEND_128_W(E[N14], px);                                                      \
 211                 E[N15] = px;                                                                        \
 212             }                                                                                       \
 213         } else if (e <= i) {                                                                        \
 214             ALPHA_BLEND_128_W( E[N15], ((df(PE,PF) <= df(PE,PH)) ? PF : PH));                       \
 215         }                                                                                           \
 216     }                                                                                               \
 217 } while (0)
 218
 219 static av_always_inline void xbr_filter(const ThreadData *td, int jobnr, int nb_jobs, int n)
 220 {
 221     int x, y;
 222     const AVFrame *input = td->in;
 223     AVFrame *output = td->out;
 224     const uint32_t *r2y = td->rgbtoyuv;
 225     const int slice_start = (input->height *  jobnr   ) / nb_jobs;
 226     const int slice_end   = (input->height * (jobnr+1)) / nb_jobs;
 227     const int nl = output->linesize[0] >> 2;
 228     const int nl1 = nl + nl;
 229     const int nl2 = nl1 + nl;
 230
 231     for (y = slice_start; y < slice_end; y++) {
 232
 233         uint32_t *E = (uint32_t *)(output->data[0] + y * output->linesize[0] * n);
 234         const uint32_t *sa2 = (uint32_t *)(input->data[0] + y * input->linesize[0] - 8); /* center */
 235         const uint32_t *sa1 = sa2 - (input->linesize[0]>>2); /* up x1 */
 236         const uint32_t *sa0 = sa1 - (input->linesize[0]>>2); /* up x2 */
 237         const uint32_t *sa3 = sa2 + (input->linesize[0]>>2); /* down x1 */
 238         const uint32_t *sa4 = sa3 + (input->linesize[0]>>2); /* down x2 */
 239
 240         if (y <= 1) {
 241             sa0 = sa1;
 242             if (y == 0) {
 243                 sa0 = sa1 = sa2;
 244             }
 245         }
 246
 247         if (y >= input->height - 2) {
 248             sa4 = sa3;
 249             if (y == input->height - 1) {
 250                 sa4 = sa3 = sa2;
 251             }
 252         }
 253
 254         for (x = 0; x < input->width; x++) {
 255             const uint32_t B1 = sa0[2];
 256             const uint32_t PB = sa1[2];
 257             const uint32_t PE = sa2[2];
 258             const uint32_t PH = sa3[2];
 259             const uint32_t H5 = sa4[2];
 260
 261             const int pprev = 2 - (x > 0);
 262             const uint32_t A1 = sa0[pprev];
 263             const uint32_t PA = sa1[pprev];
 264             const uint32_t PD = sa2[pprev];
 265             const uint32_t PG = sa3[pprev];
 266             const uint32_t G5 = sa4[pprev];
 267
 268             const int pprev2 = pprev - (x > 1);
 269             const uint32_t A0 = sa1[pprev2];
 270             const uint32_t D0 = sa2[pprev2];
 271             const uint32_t G0 = sa3[pprev2];
 272
 273             const int pnext = 3 - (x == input->width - 1);
 274             const uint32_t C1 = sa0[pnext];
 275             const uint32_t PC = sa1[pnext];
 276             const uint32_t PF = sa2[pnext];
 277             const uint32_t PI = sa3[pnext];
 278             const uint32_t I5 = sa4[pnext];
 279
 280             const int pnext2 = pnext + 1 - (x >= input->width - 2);
 281             const uint32_t C4 = sa1[pnext2];
 282             const uint32_t F4 = sa2[pnext2];
 283             const uint32_t I4 = sa3[pnext2];
 284
 285             if (n == 2) {
 286                 E[0]  = E[1]      =     // 0, 1
 287                 E[nl] = E[nl + 1] = PE; // 2, 3
 288
 289                 FILT2(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, 0, 1, nl, nl+1);
 290                 FILT2(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, nl, 0, nl+1, 1);
 291                 FILT2(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, nl+1, nl, 1, 0);
 292                 FILT2(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, 1, nl+1, 0, nl);
 293             } else if (n == 3) {
 294                 E[0]   = E[1]     = E[2]     =     // 0, 1, 2
 295                 E[nl]  = E[nl+1]  = E[nl+2]  =     // 3, 4, 5
 296                 E[nl1] = E[nl1+1] = E[nl1+2] = PE; // 6, 7, 8
 297
 298                 FILT3(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, 0, 1, 2, nl, nl+1, nl+2, nl1, nl1+1, nl1+2);
 299                 FILT3(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, nl1, nl, 0, nl1+1, nl+1, 1, nl1+2, nl+2, 2);
 300                 FILT3(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, nl1+2, nl1+1, nl1, nl+2, nl+1, nl, 2, 1, 0);
 301                 FILT3(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, 2, nl+2, nl1+2, 1, nl+1, nl1+1, 0, nl, nl1);
 302             } else if (n == 4) {
 303                 E[0]   = E[1]     = E[2]     = E[3]     =     //  0,  1,  2,  3
 304                 E[nl]  = E[nl+1]  = E[nl+2]  = E[nl+3]  =     //  4,  5,  6,  7
 305                 E[nl1] = E[nl1+1] = E[nl1+2] = E[nl1+3] =     //  8,  9, 10, 11
 306                 E[nl2] = E[nl2+1] = E[nl2+2] = E[nl2+3] = PE; // 12, 13, 14, 15
 307
 308                 FILT4(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, nl2+3, nl2+2, nl1+3, 3, nl+3, nl1+2, nl2+1, nl2, nl1+1, nl+2, 2, 1, nl+1, nl1, nl, 0);
 309                 FILT4(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, 3, nl+3, 2, 0, 1, nl+2, nl1+3, nl2+3, nl1+2, nl+1, nl, nl1, nl1+1, nl2+2, nl2+1, nl2);
 310                 FILT4(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, 0, 1, nl, nl2, nl1, nl+1, 2, 3, nl+2, nl1+1, nl2+1, nl2+2, nl1+2, nl+3, nl1+3, nl2+3);
 311                 FILT4(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, nl2, nl1, nl2+1, nl2+3, nl2+2, nl1+1, nl, 0, nl+1, nl1+2, nl1+3, nl+3, nl+2, 1, 2, 3);
 312             }
 313
 314             sa0 += 1;
 315             sa1 += 1;
 316             sa2 += 1;
 317             sa3 += 1;
 318             sa4 += 1;
 319
 320             E += n;
 321         }
 322     }
 323 }
 324
 325 #define XBR_FUNC(size) \
 326 static int xbr##size##x(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
 327 { \
 328     xbr_filter(arg, jobnr, nb_jobs, size); \
 329     return 0; \
 330 }
 331
 332 XBR_FUNC(2)
 333 XBR_FUNC(3)
 334 XBR_FUNC(4)
 335
 336
 337 static int config_output(AVFilterLink *outlink)
 338 {
 339     AVFilterContext *ctx = outlink->src;
 340     XBRContext *xbr = ctx->priv;
 341     AVFilterLink *inlink = ctx->inputs[0];
 342
 343     outlink->w = inlink->w * xbr->n;
 344     outlink->h = inlink->h * xbr->n;
 345     return 0;
 346 }
 347
 348 static int query_formats(AVFilterContext *ctx)
 349 {
 350     static const enum AVPixelFormat pix_fmts[] = {
 351         AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE,
 352     };
 353
 354     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 355     return 0;
 356 }
 357
 358 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 359 {
 360     AVFilterContext *ctx = inlink->dst;
 361     AVFilterLink *outlink = ctx->outputs[0];
 362     XBRContext *xbr = ctx->priv;
 363     ThreadData td;
 364
 365     AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 366     if (!out) {
 367         av_frame_free(&in);
 368         return AVERROR(ENOMEM);
 369     }
 370
 371     av_frame_copy_props(out, in);
 372
 373     td.in = in;
 374     td.out = out;
 375     td.rgbtoyuv = xbr->rgbtoyuv;
 376     ctx->internal->execute(ctx, xbr->func, &td, NULL, FFMIN(inlink->h, ctx->graph->nb_threads));
 377
 378     out->width  = outlink->w;
 379     out->height = outlink->h;
 380
 381     av_frame_free(&in);
 382     return ff_filter_frame(outlink, out);
 383 }
 384
 385 static int init(AVFilterContext *ctx)
 386 {
 387     XBRContext *xbr = ctx->priv;
 388     static const xbrfunc_t xbrfuncs[] = {xbr2x, xbr3x, xbr4x};
 389
 390     uint32_t c;
 391     int bg, rg, g;
 392
 393     for (bg = -255; bg < 256; bg++) {
 394         for (rg = -255; rg < 256; rg++) {
 395             const uint32_t u = (uint32_t)((-169*rg + 500*bg)/1000) + 128;
 396             const uint32_t v = (uint32_t)(( 500*rg -  81*bg)/1000) + 128;
 397             int startg = FFMAX3(-bg, -rg, 0);
 398             int endg = FFMIN3(255-bg, 255-rg, 255);
 399             uint32_t y = (uint32_t)(( 299*rg + 1000*startg + 114*bg)/1000);
 400             c = bg + (rg<<16) + 0x010101 * startg;
 401             for (g = startg; g <= endg; g++) {
 402                 xbr->rgbtoyuv[c] = ((y++) << 16) + (u << 8) + v;
 403                 c+= 0x010101;
 404             }
 405         }
 406     }
 407
 408     xbr->func = xbrfuncs[xbr->n - 2];
 409     return 0;
 410 }
 411
 412 static const AVFilterPad xbr_inputs[] = {
 413     {
 414         .name         = "default",
 415         .type         = AVMEDIA_TYPE_VIDEO,
 416         .filter_frame = filter_frame,
 417     },
 418     { NULL }
 419 };
 420
 421 static const AVFilterPad xbr_outputs[] = {
 422     {
 423         .name         = "default",
 424         .type         = AVMEDIA_TYPE_VIDEO,
 425         .config_props = config_output,
 426     },
 427     { NULL }
 428 };
 429
 430 AVFilter ff_vf_xbr = {
 431     .name          = "xbr",
 432     .description   = NULL_IF_CONFIG_SMALL("Scale the input using xBR algorithm."),
 433     .inputs        = xbr_inputs,
 434     .outputs       = xbr_outputs,
 435     .query_formats = query_formats,
 436     .priv_size     = sizeof(XBRContext),
 437     .priv_class    = &xbr_class,
 438     .init          = init,
 439     .flags         = AVFILTER_FLAG_SLICE_THREADS,
 440 };