git.sesse.net Git - ffmpeg/blob - libavfilter/vf_xbr.c

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