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

   1 /*
   2  * Copyright (c) 2020 Paul B Mahol
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/imgutils.h"
  22 #include "libavutil/eval.h"
  23 #include "libavutil/opt.h"
  24 #include "libavutil/pixfmt.h"
  25 #include "avfilter.h"
  26 #include "formats.h"
  27 #include "internal.h"
  28 #include "filters.h"
  29 #include "video.h"
  30
  31 enum XFadeTransitions {
  32     CUSTOM = -1,
  33     FADE,
  34     WIPELEFT,
  35     WIPERIGHT,
  36     WIPEUP,
  37     WIPEDOWN,
  38     SLIDELEFT,
  39     SLIDERIGHT,
  40     SLIDEUP,
  41     SLIDEDOWN,
  42     CIRCLECROP,
  43     RECTCROP,
  44     DISTANCE,
  45     FADEBLACK,
  46     FADEWHITE,
  47     RADIAL,
  48     SMOOTHLEFT,
  49     SMOOTHRIGHT,
  50     SMOOTHUP,
  51     SMOOTHDOWN,
  52     NB_TRANSITIONS,
  53 };
  54
  55 typedef struct XFadeContext {
  56     const AVClass *class;
  57
  58     int     transition;
  59     int64_t duration;
  60     int64_t offset;
  61     char   *custom_str;
  62
  63     int nb_planes;
  64     int depth;
  65
  66     int64_t duration_pts;
  67     int64_t offset_pts;
  68     int64_t first_pts;
  69     int64_t last_pts;
  70     int64_t pts;
  71     int xfade_is_over;
  72     int need_second;
  73     int eof[2];
  74     AVFrame *xf[2];
  75     int max_value;
  76     uint16_t black[4];
  77     uint16_t white[4];
  78
  79     void (*transitionf)(AVFilterContext *ctx, const AVFrame *a, const AVFrame *b, AVFrame *out, float progress,
  80                         int slice_start, int slice_end, int jobnr);
  81
  82     AVExpr *e;
  83 } XFadeContext;
  84
  85 static const char *const var_names[] = {   "X",   "Y",   "W",   "H",   "A",   "B",   "PLANE",          "P",        NULL };
  86 enum                                   { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_A, VAR_B, VAR_PLANE, VAR_PROGRESS, VAR_VARS_NB };
  87
  88 typedef struct ThreadData {
  89     const AVFrame *xf[2];
  90     AVFrame *out;
  91     float progress;
  92 } ThreadData;
  93
  94 static int query_formats(AVFilterContext *ctx)
  95 {
  96     static const enum AVPixelFormat pix_fmts[] = {
  97         AV_PIX_FMT_YUVA444P,
  98         AV_PIX_FMT_YUVJ444P,
  99         AV_PIX_FMT_YUV444P,
 100         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8,
 101         AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_GBRP9,
 102         AV_PIX_FMT_YUV444P10,
 103         AV_PIX_FMT_YUVA444P10,
 104         AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GRAY10,
 105         AV_PIX_FMT_YUV444P12,
 106         AV_PIX_FMT_YUVA444P12,
 107         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GRAY12,
 108         AV_PIX_FMT_YUV444P14, AV_PIX_FMT_GBRP14,
 109         AV_PIX_FMT_YUV444P16,
 110         AV_PIX_FMT_YUVA444P16,
 111         AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY16,
 112         AV_PIX_FMT_NONE
 113     };
 114
 115     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
 116     if (!fmts_list)
 117         return AVERROR(ENOMEM);
 118     return ff_set_common_formats(ctx, fmts_list);
 119 }
 120
 121 static av_cold void uninit(AVFilterContext *ctx)
 122 {
 123     XFadeContext *s = ctx->priv;
 124
 125     av_expr_free(s->e);
 126 }
 127
 128 #define OFFSET(x) offsetof(XFadeContext, x)
 129 #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
 130
 131 static const AVOption xfade_options[] = {
 132     { "transition", "set cross fade transition", OFFSET(transition), AV_OPT_TYPE_INT, {.i64=FADE}, -1, NB_TRANSITIONS-1, FLAGS, "transition" },
 133     {   "custom",    "custom transition",     0, AV_OPT_TYPE_CONST, {.i64=CUSTOM},    0, 0, FLAGS, "transition" },
 134     {   "fade",      "fade transition",       0, AV_OPT_TYPE_CONST, {.i64=FADE},      0, 0, FLAGS, "transition" },
 135     {   "wipeleft",  "wipe left transition",  0, AV_OPT_TYPE_CONST, {.i64=WIPELEFT},  0, 0, FLAGS, "transition" },
 136     {   "wiperight", "wipe right transition", 0, AV_OPT_TYPE_CONST, {.i64=WIPERIGHT}, 0, 0, FLAGS, "transition" },
 137     {   "wipeup",    "wipe up transition",    0, AV_OPT_TYPE_CONST, {.i64=WIPEUP},    0, 0, FLAGS, "transition" },
 138     {   "wipedown",  "wipe down transition",  0, AV_OPT_TYPE_CONST, {.i64=WIPEDOWN},  0, 0, FLAGS, "transition" },
 139     {   "slideleft",  "slide left transition",  0, AV_OPT_TYPE_CONST, {.i64=SLIDELEFT},  0, 0, FLAGS, "transition" },
 140     {   "slideright", "slide right transition", 0, AV_OPT_TYPE_CONST, {.i64=SLIDERIGHT}, 0, 0, FLAGS, "transition" },
 141     {   "slideup",    "slide up transition",    0, AV_OPT_TYPE_CONST, {.i64=SLIDEUP},    0, 0, FLAGS, "transition" },
 142     {   "slidedown",  "slide down transition",  0, AV_OPT_TYPE_CONST, {.i64=SLIDEDOWN},  0, 0, FLAGS, "transition" },
 143     {   "circlecrop", "circle crop transition", 0, AV_OPT_TYPE_CONST, {.i64=CIRCLECROP}, 0, 0, FLAGS, "transition" },
 144     {   "rectcrop",   "rect crop transition",   0, AV_OPT_TYPE_CONST, {.i64=RECTCROP},   0, 0, FLAGS, "transition" },
 145     {   "distance",   "distance transition",    0, AV_OPT_TYPE_CONST, {.i64=DISTANCE},   0, 0, FLAGS, "transition" },
 146     {   "fadeblack",  "fadeblack transition",   0, AV_OPT_TYPE_CONST, {.i64=FADEBLACK},  0, 0, FLAGS, "transition" },
 147     {   "fadewhite",  "fadewhite transition",   0, AV_OPT_TYPE_CONST, {.i64=FADEWHITE},  0, 0, FLAGS, "transition" },
 148     {   "radial",     "radial transition",      0, AV_OPT_TYPE_CONST, {.i64=RADIAL},     0, 0, FLAGS, "transition" },
 149     {   "smoothleft", "smoothleft transition",  0, AV_OPT_TYPE_CONST, {.i64=SMOOTHLEFT}, 0, 0, FLAGS, "transition" },
 150     {   "smoothright","smoothright transition", 0, AV_OPT_TYPE_CONST, {.i64=SMOOTHRIGHT},0, 0, FLAGS, "transition" },
 151     {   "smoothup",   "smoothup transition",    0, AV_OPT_TYPE_CONST, {.i64=SMOOTHUP},   0, 0, FLAGS, "transition" },
 152     {   "smoothdown", "smoothdown transition",  0, AV_OPT_TYPE_CONST, {.i64=SMOOTHDOWN}, 0, 0, FLAGS, "transition" },
 153     { "duration", "set cross fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=1000000}, 0, 60000000, FLAGS },
 154     { "offset",   "set cross fade start relative to first input stream", OFFSET(offset), AV_OPT_TYPE_DURATION, {.i64=0}, INT64_MIN, INT64_MAX, FLAGS },
 155     { "expr",   "set expression for custom transition", OFFSET(custom_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
 156     { NULL }
 157 };
 158
 159 AVFILTER_DEFINE_CLASS(xfade);
 160
 161 #define CUSTOM_TRANSITION(name, type, div)                                           \
 162 static void custom##name##_transition(AVFilterContext *ctx,                          \
 163                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 164                             float progress,                                          \
 165                             int slice_start, int slice_end, int jobnr)               \
 166 {                                                                                    \
 167     XFadeContext *s = ctx->priv;                                                     \
 168     const int height = slice_end - slice_start;                                      \
 169                                                                                      \
 170     double values[VAR_VARS_NB];                                                      \
 171     values[VAR_W] = out->width;                                                      \
 172     values[VAR_H] = out->height;                                                     \
 173     values[VAR_PROGRESS] = progress;                                                 \
 174                                                                                      \
 175     for (int p = 0; p < s->nb_planes; p++) {                                         \
 176         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 177         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 178         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 179                                                                                      \
 180         values[VAR_PLANE] = p;                                                       \
 181                                                                                      \
 182         for (int y = 0; y < height; y++) {                                           \
 183             values[VAR_Y] = slice_start + y;                                         \
 184             for (int x = 0; x < out->width; x++) {                                   \
 185                 values[VAR_X] = x;                                                   \
 186                 values[VAR_A] = xf0[x];                                              \
 187                 values[VAR_B] = xf1[x];                                              \
 188                 dst[x] = av_expr_eval(s->e, values, s);                              \
 189             }                                                                        \
 190                                                                                      \
 191             dst += out->linesize[p] / div;                                           \
 192             xf0 += a->linesize[p] / div;                                             \
 193             xf1 += b->linesize[p] / div;                                             \
 194         }                                                                            \
 195     }                                                                                \
 196 }
 197
 198 CUSTOM_TRANSITION(8, uint8_t, 1)
 199 CUSTOM_TRANSITION(16, uint16_t, 2)
 200
 201 static inline float mix(float a, float b, float mix)
 202 {
 203     return a * mix + b * (1.f - mix);
 204 }
 205
 206 static inline float smoothstep(float edge0, float edge1, float x)
 207 {
 208     float t;
 209
 210     t = av_clipf((x - edge0) / (edge1 - edge0), 0.f, 1.f);
 211
 212     return t * t * (3.f - 2.f * t);
 213 }
 214
 215 #define FADE_TRANSITION(name, type, div)                                             \
 216 static void fade##name##_transition(AVFilterContext *ctx,                            \
 217                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 218                             float progress,                                          \
 219                             int slice_start, int slice_end, int jobnr)               \
 220 {                                                                                    \
 221     XFadeContext *s = ctx->priv;                                                     \
 222     const int height = slice_end - slice_start;                                      \
 223                                                                                      \
 224     for (int p = 0; p < s->nb_planes; p++) {                                         \
 225         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 226         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 227         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 228                                                                                      \
 229         for (int y = 0; y < height; y++) {                                           \
 230             for (int x = 0; x < out->width; x++) {                                   \
 231                 dst[x] = mix(xf0[x], xf1[x], progress);                              \
 232             }                                                                        \
 233                                                                                      \
 234             dst += out->linesize[p] / div;                                           \
 235             xf0 += a->linesize[p] / div;                                             \
 236             xf1 += b->linesize[p] / div;                                             \
 237         }                                                                            \
 238     }                                                                                \
 239 }
 240
 241 FADE_TRANSITION(8, uint8_t, 1)
 242 FADE_TRANSITION(16, uint16_t, 2)
 243
 244 #define WIPELEFT_TRANSITION(name, type, div)                                         \
 245 static void wipeleft##name##_transition(AVFilterContext *ctx,                        \
 246                                 const AVFrame *a, const AVFrame *b, AVFrame *out,    \
 247                                 float progress,                                      \
 248                                 int slice_start, int slice_end, int jobnr)           \
 249 {                                                                                    \
 250     XFadeContext *s = ctx->priv;                                                     \
 251     const int height = slice_end - slice_start;                                      \
 252     const int z = out->width * progress;                                             \
 253                                                                                      \
 254     for (int p = 0; p < s->nb_planes; p++) {                                         \
 255         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 256         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 257         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 258                                                                                      \
 259         for (int y = 0; y < height; y++) {                                           \
 260             for (int x = 0; x < out->width; x++) {                                   \
 261                 dst[x] = x > z ? xf1[x] : xf0[x];                                    \
 262             }                                                                        \
 263                                                                                      \
 264             dst += out->linesize[p] / div;                                           \
 265             xf0 += a->linesize[p] / div;                                             \
 266             xf1 += b->linesize[p] / div;                                             \
 267         }                                                                            \
 268     }                                                                                \
 269 }
 270
 271 WIPELEFT_TRANSITION(8, uint8_t, 1)
 272 WIPELEFT_TRANSITION(16, uint16_t, 2)
 273
 274 #define WIPERIGHT_TRANSITION(name, type, div)                                        \
 275 static void wiperight##name##_transition(AVFilterContext *ctx,                       \
 276                                  const AVFrame *a, const AVFrame *b, AVFrame *out,   \
 277                                  float progress,                                     \
 278                                  int slice_start, int slice_end, int jobnr)          \
 279 {                                                                                    \
 280     XFadeContext *s = ctx->priv;                                                     \
 281     const int height = slice_end - slice_start;                                      \
 282     const int z = out->width * (1.f - progress);                                     \
 283                                                                                      \
 284     for (int p = 0; p < s->nb_planes; p++) {                                         \
 285         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 286         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 287         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 288                                                                                      \
 289         for (int y = 0; y < height; y++) {                                           \
 290             for (int x = 0; x < out->width; x++) {                                   \
 291                 dst[x] = x > z ? xf0[x] : xf1[x];                                    \
 292             }                                                                        \
 293                                                                                      \
 294             dst += out->linesize[p] / div;                                           \
 295             xf0 += a->linesize[p] / div;                                             \
 296             xf1 += b->linesize[p] / div;                                             \
 297         }                                                                            \
 298     }                                                                                \
 299 }
 300
 301 WIPERIGHT_TRANSITION(8, uint8_t, 1)
 302 WIPERIGHT_TRANSITION(16, uint16_t, 2)
 303
 304 #define WIPEUP_TRANSITION(name, type, div)                                           \
 305 static void wipeup##name##_transition(AVFilterContext *ctx,                          \
 306                               const AVFrame *a, const AVFrame *b, AVFrame *out,      \
 307                               float progress,                                        \
 308                               int slice_start, int slice_end, int jobnr)             \
 309 {                                                                                    \
 310     XFadeContext *s = ctx->priv;                                                     \
 311     const int height = slice_end - slice_start;                                      \
 312     const int z = out->height * progress;                                            \
 313                                                                                      \
 314     for (int p = 0; p < s->nb_planes; p++) {                                         \
 315         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 316         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 317         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 318                                                                                      \
 319         for (int y = 0; y < height; y++) {                                           \
 320             for (int x = 0; x < out->width; x++) {                                   \
 321                 dst[x] = slice_start + y > z ? xf1[x] : xf0[x];                      \
 322             }                                                                        \
 323                                                                                      \
 324             dst += out->linesize[p] / div;                                           \
 325             xf0 += a->linesize[p] / div;                                             \
 326             xf1 += b->linesize[p] / div;                                             \
 327         }                                                                            \
 328     }                                                                                \
 329 }
 330
 331 WIPEUP_TRANSITION(8, uint8_t, 1)
 332 WIPEUP_TRANSITION(16, uint16_t, 2)
 333
 334 #define WIPEDOWN_TRANSITION(name, type, div)                                         \
 335 static void wipedown##name##_transition(AVFilterContext *ctx,                        \
 336                                 const AVFrame *a, const AVFrame *b, AVFrame *out,    \
 337                                 float progress,                                      \
 338                                 int slice_start, int slice_end, int jobnr)           \
 339 {                                                                                    \
 340     XFadeContext *s = ctx->priv;                                                     \
 341     const int height = slice_end - slice_start;                                      \
 342     const int z = out->height * (1.f - progress);                                    \
 343                                                                                      \
 344     for (int p = 0; p < s->nb_planes; p++) {                                         \
 345         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 346         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 347         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 348                                                                                      \
 349         for (int y = 0; y < height; y++) {                                           \
 350             for (int x = 0; x < out->width; x++) {                                   \
 351                 dst[x] = slice_start + y > z ? xf0[x] : xf1[x];                      \
 352             }                                                                        \
 353                                                                                      \
 354             dst += out->linesize[p] / div;                                           \
 355             xf0 += a->linesize[p] / div;                                             \
 356             xf1 += b->linesize[p] / div;                                             \
 357         }                                                                            \
 358     }                                                                                \
 359 }
 360
 361 WIPEDOWN_TRANSITION(8, uint8_t, 1)
 362 WIPEDOWN_TRANSITION(16, uint16_t, 2)
 363
 364 #define SLIDELEFT_TRANSITION(name, type, div)                                        \
 365 static void slideleft##name##_transition(AVFilterContext *ctx,                       \
 366                                  const AVFrame *a, const AVFrame *b, AVFrame *out,   \
 367                                  float progress,                                     \
 368                                  int slice_start, int slice_end, int jobnr)          \
 369 {                                                                                    \
 370     XFadeContext *s = ctx->priv;                                                     \
 371     const int height = slice_end - slice_start;                                      \
 372     const int width = out->width;                                                    \
 373     const int z = -progress * width;                                                 \
 374                                                                                      \
 375     for (int p = 0; p < s->nb_planes; p++) {                                         \
 376         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 377         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 378         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 379                                                                                      \
 380         for (int y = 0; y < height; y++) {                                           \
 381             for (int x = 0; x < width; x++) {                                        \
 382                 const int zx = z + x;                                                \
 383                 const int zz = zx % width + width * (zx < 0);                        \
 384                 dst[x] = (zx > 0) && (zx < width) ? xf1[zz] : xf0[zz];               \
 385             }                                                                        \
 386                                                                                      \
 387             dst += out->linesize[p] / div;                                           \
 388             xf0 += a->linesize[p] / div;                                             \
 389             xf1 += b->linesize[p] / div;                                             \
 390         }                                                                            \
 391     }                                                                                \
 392 }
 393
 394 SLIDELEFT_TRANSITION(8, uint8_t, 1)
 395 SLIDELEFT_TRANSITION(16, uint16_t, 2)
 396
 397 #define SLIDERIGHT_TRANSITION(name, type, div)                                       \
 398 static void slideright##name##_transition(AVFilterContext *ctx,                      \
 399                                   const AVFrame *a, const AVFrame *b, AVFrame *out,  \
 400                                   float progress,                                    \
 401                                   int slice_start, int slice_end, int jobnr)         \
 402 {                                                                                    \
 403     XFadeContext *s = ctx->priv;                                                     \
 404     const int height = slice_end - slice_start;                                      \
 405     const int width = out->width;                                                    \
 406     const int z = progress * width;                                                  \
 407                                                                                      \
 408     for (int p = 0; p < s->nb_planes; p++) {                                         \
 409         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 410         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 411         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 412                                                                                      \
 413         for (int y = 0; y < height; y++) {                                           \
 414             for (int x = 0; x < out->width; x++) {                                   \
 415                 const int zx = z + x;                                                \
 416                 const int zz = zx % width + width * (zx < 0);                        \
 417                 dst[x] = (zx > 0) && (zx < width) ? xf1[zz] : xf0[zz];               \
 418             }                                                                        \
 419                                                                                      \
 420             dst += out->linesize[p] / div;                                           \
 421             xf0 += a->linesize[p] / div;                                             \
 422             xf1 += b->linesize[p] / div;                                             \
 423         }                                                                            \
 424     }                                                                                \
 425 }
 426
 427 SLIDERIGHT_TRANSITION(8, uint8_t, 1)
 428 SLIDERIGHT_TRANSITION(16, uint16_t, 2)
 429
 430 #define SLIDEUP_TRANSITION(name, type, div)                                         \
 431 static void slideup##name##_transition(AVFilterContext *ctx,                        \
 432                                const AVFrame *a, const AVFrame *b, AVFrame *out,    \
 433                                float progress,                                      \
 434                                int slice_start, int slice_end, int jobnr)           \
 435 {                                                                                   \
 436     XFadeContext *s = ctx->priv;                                                    \
 437     const int height = out->height;                                                 \
 438     const int z = -progress * height;                                               \
 439                                                                                     \
 440     for (int p = 0; p < s->nb_planes; p++) {                                        \
 441         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);        \
 442                                                                                     \
 443         for (int y = slice_start; y < slice_end; y++) {                             \
 444             const int zy = z + y;                                                   \
 445             const int zz = zy % height + height * (zy < 0);                         \
 446             const type *xf0 = (const type *)(a->data[p] + zz * a->linesize[p]);     \
 447             const type *xf1 = (const type *)(b->data[p] + zz * b->linesize[p]);     \
 448                                                                                     \
 449             for (int x = 0; x < out->width; x++) {                                  \
 450                 dst[x] = (zy > 0) && (zy < height) ? xf1[x] : xf0[x];               \
 451             }                                                                       \
 452                                                                                     \
 453             dst += out->linesize[p] / div;                                          \
 454         }                                                                           \
 455     }                                                                               \
 456 }
 457
 458 SLIDEUP_TRANSITION(8, uint8_t, 1)
 459 SLIDEUP_TRANSITION(16, uint16_t, 2)
 460
 461 #define SLIDEDOWN_TRANSITION(name, type, div)                                       \
 462 static void slidedown##name##_transition(AVFilterContext *ctx,                      \
 463                                  const AVFrame *a, const AVFrame *b, AVFrame *out,  \
 464                                  float progress,                                    \
 465                                  int slice_start, int slice_end, int jobnr)         \
 466 {                                                                                   \
 467     XFadeContext *s = ctx->priv;                                                    \
 468     const int height = out->height;                                                 \
 469     const int z = progress * height;                                                \
 470                                                                                     \
 471     for (int p = 0; p < s->nb_planes; p++) {                                        \
 472         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);        \
 473                                                                                     \
 474         for (int y = slice_start; y < slice_end; y++) {                             \
 475             const int zy = z + y;                                                   \
 476             const int zz = zy % height + height * (zy < 0);                         \
 477             const type *xf0 = (const type *)(a->data[p] + zz * a->linesize[p]);     \
 478             const type *xf1 = (const type *)(b->data[p] + zz * b->linesize[p]);     \
 479                                                                                     \
 480             for (int x = 0; x < out->width; x++) {                                  \
 481                 dst[x] = (zy > 0) && (zy < height) ? xf1[x] : xf0[x];               \
 482             }                                                                       \
 483                                                                                     \
 484             dst += out->linesize[p] / div;                                          \
 485         }                                                                           \
 486     }                                                                               \
 487 }
 488
 489 SLIDEDOWN_TRANSITION(8, uint8_t, 1)
 490 SLIDEDOWN_TRANSITION(16, uint16_t, 2)
 491
 492 #define CIRCLECROP_TRANSITION(name, type, div)                                      \
 493 static void circlecrop##name##_transition(AVFilterContext *ctx,                     \
 494                                  const AVFrame *a, const AVFrame *b, AVFrame *out,  \
 495                                  float progress,                                    \
 496                                  int slice_start, int slice_end, int jobnr)         \
 497 {                                                                                   \
 498     XFadeContext *s = ctx->priv;                                                    \
 499     const int width = out->width;                                                   \
 500     const int height = out->height;                                                 \
 501     float z = powf(2.f * fabsf(progress - 0.5f), 3.f) * hypotf(width/2, height/2);  \
 502                                                                                     \
 503     for (int p = 0; p < s->nb_planes; p++) {                                        \
 504         const int bg = s->black[p];                                                 \
 505         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);        \
 506                                                                                     \
 507         for (int y = slice_start; y < slice_end; y++) {                             \
 508             const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);      \
 509             const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);      \
 510                                                                                     \
 511             for (int x = 0; x < width; x++) {                                       \
 512                 float dist = hypotf(x - width / 2, y - height / 2);                 \
 513                 int val = progress < 0.5f ? xf1[x] : xf0[x];                        \
 514                 dst[x] = (z < dist) ? bg : val;                                     \
 515             }                                                                       \
 516                                                                                     \
 517             dst += out->linesize[p] / div;                                          \
 518         }                                                                           \
 519     }                                                                               \
 520 }
 521
 522 CIRCLECROP_TRANSITION(8, uint8_t, 1)
 523 CIRCLECROP_TRANSITION(16, uint16_t, 2)
 524
 525 #define RECTCROP_TRANSITION(name, type, div)                                        \
 526 static void rectcrop##name##_transition(AVFilterContext *ctx,                       \
 527                                  const AVFrame *a, const AVFrame *b, AVFrame *out,  \
 528                                  float progress,                                    \
 529                                  int slice_start, int slice_end, int jobnr)         \
 530 {                                                                                   \
 531     XFadeContext *s = ctx->priv;                                                    \
 532     const int width = out->width;                                                   \
 533     const int height = out->height;                                                 \
 534     int zh = fabsf(progress - 0.5f) * height;                                       \
 535     int zw = fabsf(progress - 0.5f) * width;                                        \
 536                                                                                     \
 537     for (int p = 0; p < s->nb_planes; p++) {                                        \
 538         const int bg = s->black[p];                                                 \
 539         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);        \
 540                                                                                     \
 541         for (int y = slice_start; y < slice_end; y++) {                             \
 542             const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);      \
 543             const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);      \
 544                                                                                     \
 545             for (int x = 0; x < width; x++) {                                       \
 546                 int dist = FFABS(x - width  / 2) < zw &&                            \
 547                            FFABS(y - height / 2) < zh;                              \
 548                 int val = progress < 0.5f ? xf1[x] : xf0[x];                        \
 549                 dst[x] = !dist ? bg : val;                                          \
 550             }                                                                       \
 551                                                                                     \
 552             dst += out->linesize[p] / div;                                          \
 553         }                                                                           \
 554     }                                                                               \
 555 }
 556
 557 RECTCROP_TRANSITION(8, uint8_t, 1)
 558 RECTCROP_TRANSITION(16, uint16_t, 2)
 559
 560 #define DISTANCE_TRANSITION(name, type, div)                                        \
 561 static void distance##name##_transition(AVFilterContext *ctx,                       \
 562                                  const AVFrame *a, const AVFrame *b, AVFrame *out,  \
 563                                  float progress,                                    \
 564                                  int slice_start, int slice_end, int jobnr)         \
 565 {                                                                                   \
 566     XFadeContext *s = ctx->priv;                                                    \
 567     const int width = out->width;                                                   \
 568     const float max = s->max_value;                                                 \
 569                                                                                     \
 570     for (int y = slice_start; y < slice_end; y++) {                                 \
 571         for (int x = 0; x < width; x++) {                                           \
 572             float dist = 0.f;                                                       \
 573             for (int p = 0; p < s->nb_planes; p++) {                                \
 574                 const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);  \
 575                 const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);  \
 576                                                                                     \
 577                 dist += (xf0[x] / max - xf1[x] / max) *                             \
 578                         (xf0[x] / max - xf1[x] / max);                              \
 579             }                                                                       \
 580                                                                                     \
 581             dist = sqrtf(dist) <= progress;                                         \
 582             for (int p = 0; p < s->nb_planes; p++) {                                \
 583                 const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);  \
 584                 const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);  \
 585                 type *dst = (type *)(out->data[p] + y * out->linesize[p]);          \
 586                 dst[x] = mix(mix(xf0[x], xf1[x], dist), xf1[x], progress);          \
 587             }                                                                       \
 588         }                                                                           \
 589     }                                                                               \
 590 }
 591
 592 DISTANCE_TRANSITION(8, uint8_t, 1)
 593 DISTANCE_TRANSITION(16, uint16_t, 2)
 594
 595 #define FADEBLACK_TRANSITION(name, type, div)                                        \
 596 static void fadeblack##name##_transition(AVFilterContext *ctx,                       \
 597                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 598                             float progress,                                          \
 599                             int slice_start, int slice_end, int jobnr)               \
 600 {                                                                                    \
 601     XFadeContext *s = ctx->priv;                                                     \
 602     const int height = slice_end - slice_start;                                      \
 603     const float phase = 0.2f;                                                        \
 604                                                                                      \
 605     for (int p = 0; p < s->nb_planes; p++) {                                         \
 606         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 607         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 608         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 609         const int bg = s->black[p];                                                  \
 610                                                                                      \
 611         for (int y = 0; y < height; y++) {                                           \
 612             for (int x = 0; x < out->width; x++) {                                   \
 613                 dst[x] = mix(mix(xf0[x], bg, smoothstep(1.f-phase, 1.f, progress)),  \
 614                          mix(bg, xf1[x], smoothstep(phase, 1.f, progress)),          \
 615                              progress);                                              \
 616             }                                                                        \
 617                                                                                      \
 618             dst += out->linesize[p] / div;                                           \
 619             xf0 += a->linesize[p] / div;                                             \
 620             xf1 += b->linesize[p] / div;                                             \
 621         }                                                                            \
 622     }                                                                                \
 623 }
 624
 625 FADEBLACK_TRANSITION(8, uint8_t, 1)
 626 FADEBLACK_TRANSITION(16, uint16_t, 2)
 627
 628 #define FADEWHITE_TRANSITION(name, type, div)                                        \
 629 static void fadewhite##name##_transition(AVFilterContext *ctx,                       \
 630                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 631                             float progress,                                          \
 632                             int slice_start, int slice_end, int jobnr)               \
 633 {                                                                                    \
 634     XFadeContext *s = ctx->priv;                                                     \
 635     const int height = slice_end - slice_start;                                      \
 636     const float phase = 0.2f;                                                        \
 637                                                                                      \
 638     for (int p = 0; p < s->nb_planes; p++) {                                         \
 639         const type *xf0 = (const type *)(a->data[p] + slice_start * a->linesize[p]); \
 640         const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
 641         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);         \
 642         const int bg = s->white[p];                                                  \
 643                                                                                      \
 644         for (int y = 0; y < height; y++) {                                           \
 645             for (int x = 0; x < out->width; x++) {                                   \
 646                 dst[x] = mix(mix(xf0[x], bg, smoothstep(1.f-phase, 1.f, progress)),  \
 647                          mix(bg, xf1[x], smoothstep(phase, 1.f, progress)),          \
 648                              progress);                                              \
 649             }                                                                        \
 650                                                                                      \
 651             dst += out->linesize[p] / div;                                           \
 652             xf0 += a->linesize[p] / div;                                             \
 653             xf1 += b->linesize[p] / div;                                             \
 654         }                                                                            \
 655     }                                                                                \
 656 }
 657
 658 FADEWHITE_TRANSITION(8, uint8_t, 1)
 659 FADEWHITE_TRANSITION(16, uint16_t, 2)
 660
 661 #define RADIAL_TRANSITION(name, type, div)                                           \
 662 static void radial##name##_transition(AVFilterContext *ctx,                          \
 663                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 664                             float progress,                                          \
 665                             int slice_start, int slice_end, int jobnr)               \
 666 {                                                                                    \
 667     XFadeContext *s = ctx->priv;                                                     \
 668     const int width = out->width;                                                    \
 669     const int height = out->height;                                                  \
 670                                                                                      \
 671     for (int y = slice_start; y < slice_end; y++) {                                  \
 672         for (int x = 0; x < width; x++) {                                            \
 673             const float smooth = atan2f(x - width / 2, y - height / 2) -             \
 674                                  (progress - 0.5f) * (M_PI * 2.5f);                  \
 675             for (int p = 0; p < s->nb_planes; p++) {                                 \
 676                 const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);   \
 677                 const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);   \
 678                 type *dst = (type *)(out->data[p] + y * out->linesize[p]);           \
 679                                                                                      \
 680                 dst[x] = mix(xf1[x], xf0[x], smoothstep(0.f, 1.f, smooth));          \
 681             }                                                                        \
 682         }                                                                            \
 683     }                                                                                \
 684 }
 685
 686 RADIAL_TRANSITION(8, uint8_t, 1)
 687 RADIAL_TRANSITION(16, uint16_t, 2)
 688
 689 #define SMOOTHLEFT_TRANSITION(name, type, div)                                       \
 690 static void smoothleft##name##_transition(AVFilterContext *ctx,                      \
 691                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 692                             float progress,                                          \
 693                             int slice_start, int slice_end, int jobnr)               \
 694 {                                                                                    \
 695     XFadeContext *s = ctx->priv;                                                     \
 696     const int width = out->width;                                                    \
 697     const float w = width;                                                           \
 698                                                                                      \
 699     for (int y = slice_start; y < slice_end; y++) {                                  \
 700         for (int x = 0; x < width; x++) {                                            \
 701             const float smooth = 1.f + x / w - progress * 2.f;                       \
 702                                                                                      \
 703             for (int p = 0; p < s->nb_planes; p++) {                                 \
 704                 const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);   \
 705                 const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);   \
 706                 type *dst = (type *)(out->data[p] + y * out->linesize[p]);           \
 707                                                                                      \
 708                 dst[x] = mix(xf1[x], xf0[x], smoothstep(0.f, 1.f, smooth));          \
 709             }                                                                        \
 710         }                                                                            \
 711     }                                                                                \
 712 }
 713
 714 SMOOTHLEFT_TRANSITION(8, uint8_t, 1)
 715 SMOOTHLEFT_TRANSITION(16, uint16_t, 2)
 716
 717 #define SMOOTHRIGHT_TRANSITION(name, type, div)                                      \
 718 static void smoothright##name##_transition(AVFilterContext *ctx,                     \
 719                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 720                             float progress,                                          \
 721                             int slice_start, int slice_end, int jobnr)               \
 722 {                                                                                    \
 723     XFadeContext *s = ctx->priv;                                                     \
 724     const int width = out->width;                                                    \
 725     const float w = width;                                                           \
 726                                                                                      \
 727     for (int y = slice_start; y < slice_end; y++) {                                  \
 728         for (int x = 0; x < width; x++) {                                            \
 729             const float smooth = 1.f + (w - 1 - x) / w - progress * 2.f;             \
 730                                                                                      \
 731             for (int p = 0; p < s->nb_planes; p++) {                                 \
 732                 const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);   \
 733                 const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);   \
 734                 type *dst = (type *)(out->data[p] + y * out->linesize[p]);           \
 735                                                                                      \
 736                 dst[x] = mix(xf1[x], xf0[x], smoothstep(0.f, 1.f, smooth));          \
 737             }                                                                        \
 738         }                                                                            \
 739     }                                                                                \
 740 }
 741
 742 SMOOTHRIGHT_TRANSITION(8, uint8_t, 1)
 743 SMOOTHRIGHT_TRANSITION(16, uint16_t, 2)
 744
 745 #define SMOOTHUP_TRANSITION(name, type, div)                                         \
 746 static void smoothup##name##_transition(AVFilterContext *ctx,                        \
 747                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 748                             float progress,                                          \
 749                             int slice_start, int slice_end, int jobnr)               \
 750 {                                                                                    \
 751     XFadeContext *s = ctx->priv;                                                     \
 752     const int width = out->width;                                                    \
 753     const float h = out->height;                                                     \
 754                                                                                      \
 755     for (int y = slice_start; y < slice_end; y++) {                                  \
 756         const float smooth = 1.f + y / h - progress * 2.f;                           \
 757         for (int x = 0; x < width; x++) {                                            \
 758             for (int p = 0; p < s->nb_planes; p++) {                                 \
 759                 const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);   \
 760                 const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);   \
 761                 type *dst = (type *)(out->data[p] + y * out->linesize[p]);           \
 762                                                                                      \
 763                 dst[x] = mix(xf1[x], xf0[x], smoothstep(0.f, 1.f, smooth));          \
 764             }                                                                        \
 765         }                                                                            \
 766     }                                                                                \
 767 }
 768
 769 SMOOTHUP_TRANSITION(8, uint8_t, 1)
 770 SMOOTHUP_TRANSITION(16, uint16_t, 2)
 771
 772 #define SMOOTHDOWN_TRANSITION(name, type, div)                                       \
 773 static void smoothdown##name##_transition(AVFilterContext *ctx,                      \
 774                             const AVFrame *a, const AVFrame *b, AVFrame *out,        \
 775                             float progress,                                          \
 776                             int slice_start, int slice_end, int jobnr)               \
 777 {                                                                                    \
 778     XFadeContext *s = ctx->priv;                                                     \
 779     const int width = out->width;                                                    \
 780     const float h = out->height;                                                     \
 781                                                                                      \
 782     for (int y = slice_start; y < slice_end; y++) {                                  \
 783         const float smooth = 1.f + (h - 1 - y) / h - progress * 2.f;                 \
 784         for (int x = 0; x < width; x++) {                                            \
 785             for (int p = 0; p < s->nb_planes; p++) {                                 \
 786                 const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]);   \
 787                 const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]);   \
 788                 type *dst = (type *)(out->data[p] + y * out->linesize[p]);           \
 789                                                                                      \
 790                 dst[x] = mix(xf1[x], xf0[x], smoothstep(0.f, 1.f, smooth));          \
 791             }                                                                        \
 792         }                                                                            \
 793     }                                                                                \
 794 }
 795
 796 SMOOTHDOWN_TRANSITION(8, uint8_t, 1)
 797 SMOOTHDOWN_TRANSITION(16, uint16_t, 2)
 798
 799 static inline double getpix(void *priv, double x, double y, int plane, int nb)
 800 {
 801     XFadeContext *s = priv;
 802     AVFrame *in = s->xf[nb];
 803     const uint8_t *src = in->data[FFMIN(plane, s->nb_planes - 1)];
 804     int linesize = in->linesize[FFMIN(plane, s->nb_planes - 1)];
 805     const int w = in->width;
 806     const int h = in->height;
 807
 808     int xi, yi;
 809
 810     xi = av_clipd(x, 0, w - 1);
 811     yi = av_clipd(y, 0, h - 1);
 812
 813     if (s->depth > 8) {
 814         const uint16_t *src16 = (const uint16_t*)src;
 815
 816         linesize /= 2;
 817         return src16[xi + yi * linesize];
 818     } else {
 819         return src[xi + yi * linesize];
 820     }
 821 }
 822
 823 static double a0(void *priv, double x, double y) { return getpix(priv, x, y, 0, 0); }
 824 static double a1(void *priv, double x, double y) { return getpix(priv, x, y, 1, 0); }
 825 static double a2(void *priv, double x, double y) { return getpix(priv, x, y, 2, 0); }
 826 static double a3(void *priv, double x, double y) { return getpix(priv, x, y, 3, 0); }
 827
 828 static double b0(void *priv, double x, double y) { return getpix(priv, x, y, 0, 1); }
 829 static double b1(void *priv, double x, double y) { return getpix(priv, x, y, 1, 1); }
 830 static double b2(void *priv, double x, double y) { return getpix(priv, x, y, 2, 1); }
 831 static double b3(void *priv, double x, double y) { return getpix(priv, x, y, 3, 1); }
 832
 833 static int config_output(AVFilterLink *outlink)
 834 {
 835     AVFilterContext *ctx = outlink->src;
 836     AVFilterLink *inlink0 = ctx->inputs[0];
 837     AVFilterLink *inlink1 = ctx->inputs[1];
 838     XFadeContext *s = ctx->priv;
 839     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink0->format);
 840     int is_rgb;
 841
 842     if (inlink0->format != inlink1->format) {
 843         av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
 844         return AVERROR(EINVAL);
 845     }
 846     if (inlink0->w != inlink1->w || inlink0->h != inlink1->h) {
 847         av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
 848                "(size %dx%d) do not match the corresponding "
 849                "second input link %s parameters (size %dx%d)\n",
 850                ctx->input_pads[0].name, inlink0->w, inlink0->h,
 851                ctx->input_pads[1].name, inlink1->w, inlink1->h);
 852         return AVERROR(EINVAL);
 853     }
 854
 855     if (inlink0->time_base.num != inlink1->time_base.num ||
 856         inlink0->time_base.den != inlink1->time_base.den) {
 857         av_log(ctx, AV_LOG_ERROR, "First input link %s timebase "
 858                "(%d/%d) do not match the corresponding "
 859                "second input link %s timebase (%d/%d)\n",
 860                ctx->input_pads[0].name, inlink0->time_base.num, inlink0->time_base.den,
 861                ctx->input_pads[1].name, inlink1->time_base.num, inlink1->time_base.den);
 862         return AVERROR(EINVAL);
 863     }
 864
 865     outlink->w = inlink0->w;
 866     outlink->h = inlink0->h;
 867     outlink->time_base = inlink0->time_base;
 868     outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
 869     outlink->frame_rate = inlink0->frame_rate;
 870
 871     s->depth = pix_desc->comp[0].depth;
 872     is_rgb = !!(pix_desc->flags & AV_PIX_FMT_FLAG_RGB);
 873     s->nb_planes = av_pix_fmt_count_planes(inlink0->format);
 874     s->max_value = (1 << s->depth) - 1;
 875     s->black[0] = 0;
 876     s->black[1] = s->black[2] = is_rgb ? 0 : s->max_value / 2;
 877     s->black[3] = s->max_value;
 878     s->white[0] = s->white[3] = s->max_value;
 879     s->white[1] = s->white[2] = is_rgb ? s->max_value : s->max_value / 2;
 880
 881     s->first_pts = s->last_pts = s->pts = AV_NOPTS_VALUE;
 882
 883     if (s->duration)
 884         s->duration_pts = av_rescale_q(s->duration, AV_TIME_BASE_Q, outlink->time_base);
 885     if (s->offset)
 886         s->offset_pts = av_rescale_q(s->offset, AV_TIME_BASE_Q, outlink->time_base);
 887
 888     switch (s->transition) {
 889     case CUSTOM:     s->transitionf = s->depth <= 8 ? custom8_transition     : custom16_transition;     break;
 890     case FADE:       s->transitionf = s->depth <= 8 ? fade8_transition       : fade16_transition;       break;
 891     case WIPELEFT:   s->transitionf = s->depth <= 8 ? wipeleft8_transition   : wipeleft16_transition;   break;
 892     case WIPERIGHT:  s->transitionf = s->depth <= 8 ? wiperight8_transition  : wiperight16_transition;  break;
 893     case WIPEUP:     s->transitionf = s->depth <= 8 ? wipeup8_transition     : wipeup16_transition;     break;
 894     case WIPEDOWN:   s->transitionf = s->depth <= 8 ? wipedown8_transition   : wipedown16_transition;   break;
 895     case SLIDELEFT:  s->transitionf = s->depth <= 8 ? slideleft8_transition  : slideleft16_transition;  break;
 896     case SLIDERIGHT: s->transitionf = s->depth <= 8 ? slideright8_transition : slideright16_transition; break;
 897     case SLIDEUP:    s->transitionf = s->depth <= 8 ? slideup8_transition    : slideup16_transition;    break;
 898     case SLIDEDOWN:  s->transitionf = s->depth <= 8 ? slidedown8_transition  : slidedown16_transition;  break;
 899     case CIRCLECROP: s->transitionf = s->depth <= 8 ? circlecrop8_transition : circlecrop16_transition; break;
 900     case RECTCROP:   s->transitionf = s->depth <= 8 ? rectcrop8_transition   : rectcrop16_transition;   break;
 901     case DISTANCE:   s->transitionf = s->depth <= 8 ? distance8_transition   : distance16_transition;   break;
 902     case FADEBLACK:  s->transitionf = s->depth <= 8 ? fadeblack8_transition  : fadeblack16_transition;  break;
 903     case FADEWHITE:  s->transitionf = s->depth <= 8 ? fadewhite8_transition  : fadewhite16_transition;  break;
 904     case RADIAL:     s->transitionf = s->depth <= 8 ? radial8_transition     : radial16_transition;     break;
 905     case SMOOTHLEFT: s->transitionf = s->depth <= 8 ? smoothleft8_transition : smoothleft16_transition; break;
 906     case SMOOTHRIGHT:s->transitionf = s->depth <= 8 ? smoothright8_transition: smoothright16_transition;break;
 907     case SMOOTHUP:   s->transitionf = s->depth <= 8 ? smoothup8_transition   : smoothup16_transition;   break;
 908     case SMOOTHDOWN: s->transitionf = s->depth <= 8 ? smoothdown8_transition : smoothdown16_transition; break;
 909     }
 910
 911     if (s->transition == CUSTOM) {
 912         static const char *const func2_names[]    = {
 913             "a0", "a1", "a2", "a3",
 914             "b0", "b1", "b2", "b3",
 915             NULL
 916         };
 917         double (*func2[])(void *, double, double) = {
 918             a0, a1, a2, a3,
 919             b0, b1, b2, b3,
 920             NULL };
 921         int ret;
 922
 923         if (!s->custom_str)
 924             return AVERROR(EINVAL);
 925         ret = av_expr_parse(&s->e, s->custom_str, var_names,
 926                             NULL, NULL, func2_names, func2, 0, ctx);
 927         if (ret < 0)
 928             return ret;
 929     }
 930
 931     return 0;
 932 }
 933
 934 static int xfade_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 935 {
 936     XFadeContext *s = ctx->priv;
 937     AVFilterLink *outlink = ctx->outputs[0];
 938     ThreadData *td = arg;
 939     int slice_start = (outlink->h *  jobnr   ) / nb_jobs;
 940     int slice_end   = (outlink->h * (jobnr+1)) / nb_jobs;
 941
 942     s->transitionf(ctx, td->xf[0], td->xf[1], td->out, td->progress, slice_start, slice_end, jobnr);
 943
 944     return 0;
 945 }
 946
 947 static int xfade_frame(AVFilterContext *ctx, AVFrame *a, AVFrame *b)
 948 {
 949     XFadeContext *s = ctx->priv;
 950     AVFilterLink *outlink = ctx->outputs[0];
 951     float progress = av_clipf(1.f - ((float)(s->pts - s->first_pts - s->offset_pts) / s->duration_pts), 0.f, 1.f);
 952     ThreadData td;
 953     AVFrame *out;
 954
 955     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 956     if (!out)
 957         return AVERROR(ENOMEM);
 958
 959     td.xf[0] = a, td.xf[1] = b, td.out = out, td.progress = progress;
 960     ctx->internal->execute(ctx, xfade_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
 961
 962     out->pts = s->pts;
 963
 964     return ff_filter_frame(outlink, out);
 965 }
 966
 967 static int xfade_activate(AVFilterContext *ctx)
 968 {
 969     XFadeContext *s = ctx->priv;
 970     AVFilterLink *outlink = ctx->outputs[0];
 971     AVFrame *in = NULL;
 972     int ret = 0, status;
 973     int64_t pts;
 974
 975     FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
 976
 977     if (s->xfade_is_over) {
 978         ret = ff_inlink_consume_frame(ctx->inputs[1], &in);
 979         if (ret < 0) {
 980             return ret;
 981         } else if (ret > 0) {
 982             in->pts = (in->pts - s->last_pts) + s->pts;
 983             return ff_filter_frame(outlink, in);
 984         } else if (ff_inlink_acknowledge_status(ctx->inputs[1], &status, &pts)) {
 985             ff_outlink_set_status(outlink, status, s->pts);
 986             return 0;
 987         } else if (!ret) {
 988             if (ff_outlink_frame_wanted(outlink)) {
 989                 ff_inlink_request_frame(ctx->inputs[1]);
 990                 return 0;
 991             }
 992         }
 993     }
 994
 995     if (ff_inlink_queued_frames(ctx->inputs[0]) > 0) {
 996         s->xf[0] = ff_inlink_peek_frame(ctx->inputs[0], 0);
 997         if (s->xf[0]) {
 998             if (s->first_pts == AV_NOPTS_VALUE) {
 999                 s->first_pts = s->xf[0]->pts;
1000             }
1001             s->pts = s->xf[0]->pts;
1002             if (s->first_pts + s->offset_pts > s->xf[0]->pts) {
1003                 s->xf[0] = NULL;
1004                 s->need_second = 0;
1005                 ff_inlink_consume_frame(ctx->inputs[0], &in);
1006                 return ff_filter_frame(outlink, in);
1007             }
1008
1009             s->need_second = 1;
1010         }
1011     }
1012
1013     if (s->xf[0] && ff_inlink_queued_frames(ctx->inputs[1]) > 0) {
1014         ff_inlink_consume_frame(ctx->inputs[0], &s->xf[0]);
1015         ff_inlink_consume_frame(ctx->inputs[1], &s->xf[1]);
1016
1017         s->last_pts = s->xf[1]->pts;
1018         s->pts = s->xf[0]->pts;
1019         if (s->xf[0]->pts - (s->first_pts + s->offset_pts) > s->duration_pts)
1020             s->xfade_is_over = 1;
1021         ret = xfade_frame(ctx, s->xf[0], s->xf[1]);
1022         av_frame_free(&s->xf[0]);
1023         av_frame_free(&s->xf[1]);
1024         return ret;
1025     }
1026
1027     if (ff_inlink_queued_frames(ctx->inputs[0]) > 0 &&
1028         ff_inlink_queued_frames(ctx->inputs[1]) > 0) {
1029         ff_filter_set_ready(ctx, 100);
1030         return 0;
1031     }
1032
1033     if (ff_outlink_frame_wanted(outlink)) {
1034         if (!s->eof[0] && ff_outlink_get_status(ctx->inputs[0])) {
1035             s->eof[0] = 1;
1036             s->xfade_is_over = 1;
1037         }
1038         if (!s->eof[1] && ff_outlink_get_status(ctx->inputs[1])) {
1039             s->eof[1] = 1;
1040         }
1041         if (!s->eof[0] && !s->xf[0])
1042             ff_inlink_request_frame(ctx->inputs[0]);
1043         if (!s->eof[1] && (s->need_second || s->eof[0]))
1044             ff_inlink_request_frame(ctx->inputs[1]);
1045         if (s->eof[0] && s->eof[1] && (
1046             ff_inlink_queued_frames(ctx->inputs[0]) <= 0 ||
1047             ff_inlink_queued_frames(ctx->inputs[1]) <= 0))
1048             ff_outlink_set_status(outlink, AVERROR_EOF, AV_NOPTS_VALUE);
1049         return 0;
1050     }
1051
1052     return FFERROR_NOT_READY;
1053 }
1054
1055 static const AVFilterPad xfade_inputs[] = {
1056     {
1057         .name          = "main",
1058         .type          = AVMEDIA_TYPE_VIDEO,
1059     },
1060     {
1061         .name          = "xfade",
1062         .type          = AVMEDIA_TYPE_VIDEO,
1063     },
1064     { NULL }
1065 };
1066
1067 static const AVFilterPad xfade_outputs[] = {
1068     {
1069         .name          = "default",
1070         .type          = AVMEDIA_TYPE_VIDEO,
1071         .config_props  = config_output,
1072     },
1073     { NULL }
1074 };
1075
1076 AVFilter ff_vf_xfade = {
1077     .name          = "xfade",
1078     .description   = NULL_IF_CONFIG_SMALL("Cross fade one video with another video."),
1079     .priv_size     = sizeof(XFadeContext),
1080     .priv_class    = &xfade_class,
1081     .query_formats = query_formats,
1082     .activate      = xfade_activate,
1083     .uninit        = uninit,
1084     .inputs        = xfade_inputs,
1085     .outputs       = xfade_outputs,
1086     .flags         = AVFILTER_FLAG_SLICE_THREADS,
1087 };