git.sesse.net Git - ffmpeg/blob - libavfilter/vf_shufflepixels.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/avassert.h"
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/common.h"
  24 #include "libavutil/internal.h"
  25 #include "libavutil/imgutils.h"
  26 #include "libavutil/lfg.h"
  27 #include "libavutil/opt.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "libavutil/random_seed.h"
  30
  31 #include "avfilter.h"
  32 #include "internal.h"
  33 #include "video.h"
  34
  35 typedef struct ShufflePixelsContext {
  36     const AVClass *class;
  37
  38     int block_w, block_h;
  39     int mode;
  40     int direction;
  41     int64_t seed;
  42
  43     int depth;
  44     int nb_planes;
  45     int linesize[4];
  46     int planewidth[4];
  47     int planeheight[4];
  48
  49     int nb_blocks;
  50
  51     uint8_t *used;
  52     int32_t *map;
  53
  54     AVLFG c;
  55
  56     int (*shuffle_pixels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
  57 } ShufflePixelsContext;
  58
  59 static int query_formats(AVFilterContext *ctx)
  60 {
  61     static const enum AVPixelFormat pix_fmts[] = {
  62         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
  63         AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P,
  64         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10,
  65         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
  66         AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GBRAP,
  67         AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUVA444P10,
  68         AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUVA444P16,
  69         AV_PIX_FMT_NONE
  70     };
  71     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
  72     if (!fmts_list)
  73         return AVERROR(ENOMEM);
  74     return ff_set_common_formats(ctx, fmts_list);
  75 }
  76
  77 static void make_horizontal_map(AVFilterContext *ctx)
  78 {
  79     ShufflePixelsContext *s = ctx->priv;
  80     const int nb_blocks = s->nb_blocks;
  81     AVLFG *c = &s->c;
  82     uint8_t *used = s->used;
  83     int32_t *map = s->map;
  84
  85     for (int x = 0; x < s->planewidth[0];) {
  86         int rand = av_lfg_get(c) % nb_blocks;
  87
  88         if (used[rand] == 0) {
  89             int width;
  90
  91             if (s->direction) {
  92                 width = FFMIN(s->block_w, s->planewidth[0] - x);
  93                 map[rand * s->block_w] = x;
  94             } else {
  95                 width = FFMIN(s->block_w, s->planewidth[0] - rand * s->block_w);
  96                 map[x] = rand * s->block_w;
  97             }
  98             used[rand] = 1;
  99
 100             if (s->direction) {
 101                 for (int i = 1; i < width; i++) {
 102                     map[rand * s->block_w + i] = map[rand * s->block_w] + i;
 103                 }
 104             } else {
 105                 for (int i = 1; i < width; i++) {
 106                     map[x + i] = map[x] + i;
 107                 }
 108             }
 109
 110             x += width;
 111         }
 112     }
 113 }
 114
 115 static void make_vertical_map(AVFilterContext *ctx)
 116 {
 117     ShufflePixelsContext *s = ctx->priv;
 118     const int nb_blocks = s->nb_blocks;
 119     AVLFG *c = &s->c;
 120     uint8_t *used = s->used;
 121     int32_t *map = s->map;
 122
 123     for (int y = 0; y < s->planeheight[0];) {
 124         int rand = av_lfg_get(c) % nb_blocks;
 125
 126         if (used[rand] == 0) {
 127             int height;
 128
 129             if (s->direction) {
 130                 height = FFMIN(s->block_h, s->planeheight[0] - y);
 131                 map[rand * s->block_h] = y;
 132             } else {
 133                 height = FFMIN(s->block_h, s->planeheight[0] - rand * s->block_h);
 134                 map[y] = rand * s->block_h;
 135             }
 136             used[rand] = 1;
 137
 138             if (s->direction) {
 139                 for (int i = 1; i < height; i++) {
 140                     map[rand * s->block_h + i] = map[rand * s->block_h] + i;
 141                 }
 142             } else {
 143                 for (int i = 1; i < height; i++) {
 144                     map[y + i] = map[y] + i;
 145                 }
 146             }
 147
 148             y += height;
 149         }
 150     }
 151 }
 152
 153 static void make_block_map(AVFilterContext *ctx)
 154 {
 155     ShufflePixelsContext *s = ctx->priv;
 156     const int nb_blocks = s->nb_blocks;
 157     int nb_blocks_w = s->planewidth[0]  / s->block_w;
 158     AVLFG *c = &s->c;
 159     uint8_t *used = s->used;
 160     int32_t *map = s->map;
 161
 162     for (int i = 0; i < nb_blocks;) {
 163         int rand = av_lfg_get(c) % nb_blocks;
 164
 165         if (used[rand] == 0) {
 166             int yin = i / nb_blocks_w;
 167             int xin = i % nb_blocks_w;
 168             int in = yin * s->block_h * s->planewidth[0] + xin * s->block_w;
 169             int yout = rand / nb_blocks_w;
 170             int xout = rand % nb_blocks_w;
 171             int out = yout * s->block_h * s->planewidth[0] + xout * s->block_w;
 172
 173             if (s->direction) {
 174                 map[out] = in;
 175             } else {
 176                 map[in] = out;
 177             }
 178             used[rand] = 1;
 179
 180             if (s->direction) {
 181                 for (int y = 0; y < s->block_h; y++) {
 182                     for (int x = 0; x < s->block_w; x++) {
 183                         map[out + y * s->planewidth[0] + x] = map[out] + x + y * s->planewidth[0];
 184                     }
 185                 }
 186             } else {
 187                 for (int y = 0; y < s->block_h; y++) {
 188                     for (int x = 0; x < s->block_w; x++) {
 189                         map[in + y * s->planewidth[0] + x] = map[in] + x + y * s->planewidth[0];
 190                     }
 191                 }
 192             }
 193
 194             i++;
 195         }
 196     }
 197 }
 198
 199 typedef struct ThreadData {
 200     AVFrame *in, *out;
 201 } ThreadData;
 202
 203
 204 #define SHUFFLE_HORIZONTAL(name, type)                                       \
 205 static int shuffle_horizontal## name(AVFilterContext *ctx, void *arg,        \
 206                                      int jobnr, int nb_jobs)                 \
 207 {                                                                            \
 208     ShufflePixelsContext *s = ctx->priv;                                     \
 209     ThreadData *td = arg;                                                    \
 210     AVFrame *in = td->in;                                                    \
 211     AVFrame *out = td->out;                                                  \
 212                                                                              \
 213     for (int p = 0; p < s->nb_planes; p++) {                                 \
 214         const int slice_start = (s->planeheight[p] * jobnr) / nb_jobs;       \
 215         const int slice_end = (s->planeheight[p] * (jobnr+1)) / nb_jobs;     \
 216         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
 217         const type *src = (const type *)(in->data[p] +                       \
 218                                          slice_start * in->linesize[p]);     \
 219         const int32_t *map = s->map;                                         \
 220                                                                              \
 221         for (int y = slice_start; y < slice_end; y++) {                      \
 222             for (int x = 0; x < s->planewidth[p]; x++) {                     \
 223                 dst[x] = src[map[x]];                                        \
 224             }                                                                \
 225                                                                              \
 226             dst += out->linesize[p] / sizeof(type);                          \
 227             src += in->linesize[p] / sizeof(type);                           \
 228         }                                                                    \
 229     }                                                                        \
 230                                                                              \
 231     return 0;                                                                \
 232 }
 233
 234 SHUFFLE_HORIZONTAL(8, uint8_t)
 235 SHUFFLE_HORIZONTAL(16, uint16_t)
 236
 237 #define SHUFFLE_VERTICAL(name, type)                                         \
 238 static int shuffle_vertical## name(AVFilterContext *ctx, void *arg,          \
 239                             int jobnr, int nb_jobs)                          \
 240 {                                                                            \
 241     ShufflePixelsContext *s = ctx->priv;                                     \
 242     ThreadData *td = arg;                                                    \
 243     AVFrame *in = td->in;                                                    \
 244     AVFrame *out = td->out;                                                  \
 245                                                                              \
 246     for (int p = 0; p < s->nb_planes; p++) {                                 \
 247         const int slice_start = (s->planeheight[p] * jobnr) / nb_jobs;       \
 248         const int slice_end = (s->planeheight[p] * (jobnr+1)) / nb_jobs;     \
 249         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
 250         const int32_t *map = s->map;                                         \
 251                                                                              \
 252         for (int y = slice_start; y < slice_end; y++) {                      \
 253             const type *src = (const type *)(in->data[p] +                   \
 254                                              map[y] * in->linesize[p]);      \
 255                                                                              \
 256             memcpy(dst, src, s->linesize[p]);                                \
 257             dst += out->linesize[p] / sizeof(type);                          \
 258         }                                                                    \
 259     }                                                                        \
 260                                                                              \
 261     return 0;                                                                \
 262 }
 263
 264 SHUFFLE_VERTICAL(8, uint8_t)
 265 SHUFFLE_VERTICAL(16, uint16_t)
 266
 267 #define SHUFFLE_BLOCK(name, type)                                            \
 268 static int shuffle_block## name(AVFilterContext *ctx, void *arg,             \
 269                          int jobnr, int nb_jobs)                             \
 270 {                                                                            \
 271     ShufflePixelsContext *s = ctx->priv;                                     \
 272     ThreadData *td = arg;                                                    \
 273     AVFrame *in = td->in;                                                    \
 274     AVFrame *out = td->out;                                                  \
 275                                                                              \
 276     for (int p = 0; p < s->nb_planes; p++) {                                 \
 277         const int slice_start = (s->planeheight[p] * jobnr) / nb_jobs;       \
 278         const int slice_end = (s->planeheight[p] * (jobnr+1)) / nb_jobs;     \
 279         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
 280         const type *src = (const type *)in->data[p];                         \
 281         const int32_t *map = s->map + slice_start * s->planewidth[p];        \
 282                                                                              \
 283         for (int y = slice_start; y < slice_end; y++) {                      \
 284             for (int x = 0; x < s->planewidth[p]; x++) {                     \
 285                 int ymap = map[x] / s->planewidth[p];                        \
 286                 int xmap = map[x] % s->planewidth[p];                        \
 287                                                                              \
 288                 dst[x] = src[xmap + ymap * in->linesize[p] / sizeof(type)];  \
 289             }                                                                \
 290                                                                              \
 291             dst += out->linesize[p] / sizeof(type);                          \
 292             map += s->planewidth[p];                                         \
 293         }                                                                    \
 294     }                                                                        \
 295                                                                              \
 296     return 0;                                                                \
 297 }
 298
 299 SHUFFLE_BLOCK(8, uint8_t)
 300 SHUFFLE_BLOCK(16, uint16_t)
 301
 302 static int config_output(AVFilterLink *outlink)
 303 {
 304     AVFilterContext *ctx = outlink->src;
 305     ShufflePixelsContext *s = ctx->priv;
 306     AVFilterLink *inlink = ctx->inputs[0];
 307     const AVPixFmtDescriptor *desc;
 308     int ret;
 309
 310     if (s->seed == -1)
 311         s->seed = av_get_random_seed();
 312     av_lfg_init(&s->c, s->seed);
 313
 314     desc = av_pix_fmt_desc_get(outlink->format);
 315     if (!desc)
 316         return AVERROR_BUG;
 317     s->nb_planes = av_pix_fmt_count_planes(outlink->format);
 318     s->depth = desc->comp[0].depth;
 319
 320     if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
 321         return ret;
 322
 323     s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
 324     s->planewidth[0] = s->planewidth[3] = inlink->w;
 325
 326     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
 327     s->planeheight[0] = s->planeheight[3] = inlink->h;
 328
 329     s->map = av_calloc(inlink->w * inlink->h, sizeof(*s->map));
 330     if (!s->map)
 331         return AVERROR(ENOMEM);
 332
 333     switch (s->mode) {
 334     case 0:
 335         s->shuffle_pixels = s->depth <= 8 ? shuffle_horizontal8 : shuffle_horizontal16;
 336         s->nb_blocks = (s->planewidth[0] + s->block_w - 1) / s->block_w;
 337         break;
 338     case 1:
 339         s->shuffle_pixels = s->depth <= 8 ? shuffle_vertical8 : shuffle_vertical16;
 340         s->nb_blocks = (s->planeheight[0] + s->block_h - 1) / s->block_h;
 341         break;
 342     case 2:
 343         s->shuffle_pixels = s->depth <= 8 ? shuffle_block8 : shuffle_block16;
 344         s->nb_blocks = (s->planeheight[0] / s->block_h) *
 345                        (s->planewidth[0]  / s->block_w);
 346         break;
 347     default:
 348         av_assert0(0);
 349     }
 350
 351     s->used = av_calloc(s->nb_blocks, sizeof(*s->used));
 352     if (!s->used)
 353         return AVERROR(ENOMEM);
 354
 355     switch (s->mode) {
 356     case 0:
 357         make_horizontal_map(ctx);
 358         break;
 359     case 1:
 360         make_vertical_map(ctx);
 361         break;
 362     case 2:
 363         make_block_map(ctx);
 364         break;
 365     default:
 366         av_assert0(0);
 367     }
 368
 369     return 0;
 370 }
 371
 372 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 373 {
 374     AVFilterContext *ctx = inlink->dst;
 375     ShufflePixelsContext *s = ctx->priv;
 376     AVFrame *out = ff_get_video_buffer(ctx->outputs[0], in->width, in->height);
 377     ThreadData td;
 378     int ret;
 379
 380     ret = av_frame_copy_props(out, in);
 381     if (ret < 0) {
 382         av_frame_free(&out);
 383         goto fail;
 384     }
 385
 386     td.out = out;
 387     td.in = in;
 388     ctx->internal->execute(ctx, s->shuffle_pixels, &td, NULL, FFMIN(s->planeheight[1], ff_filter_get_nb_threads(ctx)));
 389
 390     av_frame_free(&in);
 391     return ff_filter_frame(ctx->outputs[0], out);
 392 fail:
 393     av_frame_free(&in);
 394     return ret;
 395 }
 396
 397 static av_cold void uninit(AVFilterContext *ctx)
 398 {
 399     ShufflePixelsContext *s = ctx->priv;
 400
 401     av_freep(&s->map);
 402     av_freep(&s->used);
 403 }
 404
 405 #define OFFSET(x) offsetof(ShufflePixelsContext, x)
 406 #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
 407 static const AVOption shufflepixels_options[] = {
 408     { "direction",  "set shuffle direction",  OFFSET(direction), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "dir" },
 409     { "d",          "set shuffle direction",  OFFSET(direction), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "dir" },
 410     {  "forward",    0,  0,  AV_OPT_TYPE_CONST,     {.i64=0}, 0,  0, FLAGS, "dir" },
 411     {  "inverse",    0,  0,  AV_OPT_TYPE_CONST,     {.i64=1}, 0,  0, FLAGS, "dir" },
 412     { "mode",       "set shuffle mode",  OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "mode" },
 413     { "m",          "set shuffle mode",  OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "mode" },
 414     {  "horizontal",  0,  0,  AV_OPT_TYPE_CONST,     {.i64=0}, 0,  0, FLAGS, "mode" },
 415     {  "vertical",    0,  0,  AV_OPT_TYPE_CONST,     {.i64=1}, 0,  0, FLAGS, "mode" },
 416     {  "block",       0,  0,  AV_OPT_TYPE_CONST,     {.i64=2}, 0,  0, FLAGS, "mode" },
 417     { "width",      "set block width",  OFFSET(block_w), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
 418     { "w",          "set block width",  OFFSET(block_w), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
 419     { "height",     "set block height", OFFSET(block_h), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
 420     { "h",          "set block height", OFFSET(block_h), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
 421     { "seed",       "set random seed",  OFFSET(seed),   AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT_MAX, FLAGS },
 422     { "s",          "set random seed",  OFFSET(seed),   AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT_MAX, FLAGS },
 423     { NULL },
 424 };
 425
 426 AVFILTER_DEFINE_CLASS(shufflepixels);
 427
 428 static const AVFilterPad shufflepixels_inputs[] = {
 429     {
 430         .name         = "default",
 431         .type         = AVMEDIA_TYPE_VIDEO,
 432         .filter_frame = filter_frame,
 433     },
 434     { NULL },
 435 };
 436
 437 static const AVFilterPad shufflepixels_outputs[] = {
 438     {
 439         .name          = "default",
 440         .type          = AVMEDIA_TYPE_VIDEO,
 441         .config_props  = config_output,
 442     },
 443     { NULL },
 444 };
 445
 446 AVFilter ff_vf_shufflepixels = {
 447     .name          = "shufflepixels",
 448     .description   = NULL_IF_CONFIG_SMALL("Shuffle video pixels."),
 449     .priv_size     = sizeof(ShufflePixelsContext),
 450     .priv_class    = &shufflepixels_class,
 451     .query_formats = query_formats,
 452     .uninit        = uninit,
 453     .inputs        = shufflepixels_inputs,
 454     .outputs       = shufflepixels_outputs,
 455     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
 456 };