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