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

   1 /*
   2  * Copyright (c) 2021 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/avstring.h"
  22 #include "libavutil/opt.h"
  23 #include "libavutil/intreadwrite.h"
  24 #include "libavutil/parseutils.h"
  25 #include "libavutil/pixdesc.h"
  26
  27 #include "avfilter.h"
  28 #include "drawutils.h"
  29 #include "internal.h"
  30 #include "video.h"
  31
  32 #include <float.h>
  33
  34 typedef struct ShearContext {
  35     const AVClass *class;
  36
  37     float shx, shy;
  38     int interp;
  39
  40     uint8_t fillcolor[4];   ///< color expressed either in YUVA or RGBA colorspace for the padding area
  41     char *fillcolor_str;
  42     int fillcolor_enable;
  43     int nb_planes;
  44     int depth;
  45     FFDrawContext draw;
  46     FFDrawColor color;
  47
  48     int hsub, vsub;
  49     int planewidth[4];
  50     int planeheight[4];
  51
  52     int (*filter_slice[2])(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
  53 } ShearContext;
  54
  55 typedef struct ThreadData {
  56     AVFrame *in, *out;
  57 } ThreadData;
  58
  59 #define OFFSET(x) offsetof(ShearContext, x)
  60 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
  61
  62 static const AVOption shear_options[] = {
  63     { "shx",       "set x shear factor",        OFFSET(shx),           AV_OPT_TYPE_FLOAT,  {.dbl=0.},     -2, 2, .flags=FLAGS },
  64     { "shy",       "set y shear factor",        OFFSET(shy),           AV_OPT_TYPE_FLOAT,  {.dbl=0.},     -2, 2, .flags=FLAGS },
  65     { "fillcolor", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, 0, 0, .flags=FLAGS },
  66     { "c",         "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, 0, 0, .flags=FLAGS },
  67     { "interp",    "set interpolation",         OFFSET(interp),        AV_OPT_TYPE_INT,    {.i64=1},       0, 1, .flags=FLAGS, "interp" },
  68     {  "nearest",  "nearest neighbour",         0,                     AV_OPT_TYPE_CONST,  {.i64=0},       0, 0, .flags=FLAGS, "interp" },
  69     {  "bilinear", "bilinear",                  0,                     AV_OPT_TYPE_CONST,  {.i64=1},       0, 0, .flags=FLAGS, "interp" },
  70     { NULL }
  71 };
  72
  73 AVFILTER_DEFINE_CLASS(shear);
  74
  75 static av_cold int init(AVFilterContext *ctx)
  76 {
  77     ShearContext *s = ctx->priv;
  78
  79     if (!strcmp(s->fillcolor_str, "none"))
  80         s->fillcolor_enable = 0;
  81     else if (av_parse_color(s->fillcolor, s->fillcolor_str, -1, ctx) >= 0)
  82         s->fillcolor_enable = 1;
  83     else
  84         return AVERROR(EINVAL);
  85     return 0;
  86 }
  87
  88 static int query_formats(AVFilterContext *ctx)
  89 {
  90     static const enum AVPixelFormat pix_fmts[] = {
  91         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
  92         AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
  93         AV_PIX_FMT_GRAY16,
  94         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
  95         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
  96         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
  97         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
  98         AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
  99         AV_PIX_FMT_YUVJ411P,
 100         AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
 101         AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
 102         AV_PIX_FMT_YUV440P10,
 103         AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
 104         AV_PIX_FMT_YUV440P12,
 105         AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
 106         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
 107         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
 108         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
 109         AV_PIX_FMT_YUVA420P,  AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA444P,
 110         AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
 111         AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
 112         AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
 113         AV_PIX_FMT_GBRAP,     AV_PIX_FMT_GBRAP10,    AV_PIX_FMT_GBRAP12,    AV_PIX_FMT_GBRAP16,
 114         AV_PIX_FMT_NONE
 115     };
 116
 117     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
 118     if (!fmts_list)
 119         return AVERROR(ENOMEM);
 120     return ff_set_common_formats(ctx, fmts_list);
 121 }
 122
 123 #define NN(type, name)                                                       \
 124 static int filter_slice_nn##name(AVFilterContext *ctx, void *arg, int jobnr, \
 125                                  int nb_jobs)                                \
 126 {                                                                            \
 127     ThreadData *td = arg;                                                    \
 128     AVFrame *in = td->in;                                                    \
 129     AVFrame *out = td->out;                                                  \
 130     ShearContext *s = ctx->priv;                                             \
 131     const float shx = s->shx;                                                \
 132     const float shy = s->shy;                                                \
 133                                                                              \
 134     for (int p = 0; p < s->nb_planes; p++) {                                 \
 135         const int hsub = (p == 1 || p == 2) ? s->hsub: 1;                    \
 136         const int vsub = (p == 1 || p == 2) ? s->vsub: 1;                    \
 137         const int width = s->planewidth[p];                                  \
 138         const int height = s->planeheight[p];                                \
 139         const int wx = vsub * shx * height * 0.5f / hsub;                    \
 140         const int wy = hsub * shy * width  * 0.5f / vsub;                    \
 141         const int slice_start = (height * jobnr) / nb_jobs;                  \
 142         const int slice_end = (height * (jobnr+1)) / nb_jobs;                \
 143         const int src_linesize = in->linesize[p] / sizeof(type);             \
 144         const int dst_linesize = out->linesize[p] / sizeof(type);            \
 145         const type *src = (const type *)in->data[p];                         \
 146         type *dst = (type *)out->data[p] + slice_start * dst_linesize;       \
 147                                                                              \
 148         for (int y = slice_start; y < slice_end; y++) {                      \
 149             for (int x = 0; x < width; x++) {                                \
 150                 int sx = x + vsub * shx * y / hsub - wx;                     \
 151                 int sy = y + hsub * shy * x / vsub - wy;                     \
 152                                                                              \
 153                 if (sx >= 0 && sx < width - 1 &&                             \
 154                     sy >= 0 && sy < height - 1) {                            \
 155                     dst[x] = src[sy * src_linesize + sx];                    \
 156                 }                                                            \
 157             }                                                                \
 158                                                                              \
 159             dst += dst_linesize;                                             \
 160         }                                                                    \
 161     }                                                                        \
 162                                                                              \
 163     return 0;                                                                \
 164 }
 165
 166 NN(uint8_t, 8)
 167 NN(uint16_t, 16)
 168
 169 #define BL(type, name)                                                       \
 170 static int filter_slice_bl##name(AVFilterContext *ctx, void *arg, int jobnr, \
 171                                  int nb_jobs)                                \
 172 {                                                                            \
 173     ThreadData *td = arg;                                                    \
 174     AVFrame *in = td->in;                                                    \
 175     AVFrame *out = td->out;                                                  \
 176     ShearContext *s = ctx->priv;                                             \
 177     const int depth = s->depth;                                              \
 178     const float shx = s->shx;                                                \
 179     const float shy = s->shy;                                                \
 180                                                                              \
 181     for (int p = 0; p < s->nb_planes; p++) {                                 \
 182         const int hsub = (p == 1 || p == 2) ? s->hsub: 1;                    \
 183         const int vsub = (p == 1 || p == 2) ? s->vsub: 1;                    \
 184         const int width = s->planewidth[p];                                  \
 185         const int height = s->planeheight[p];                                \
 186         const float wx = vsub * shx * height * 0.5f / hsub;                  \
 187         const float wy = hsub * shy * width  * 0.5f / vsub;                  \
 188         const int slice_start = (height * jobnr) / nb_jobs;                  \
 189         const int slice_end = (height * (jobnr+1)) / nb_jobs;                \
 190         const int src_linesize = in->linesize[p] / sizeof(type);             \
 191         const int dst_linesize = out->linesize[p] / sizeof(type);            \
 192         const type *src = (const type *)in->data[p];                         \
 193         type *dst = (type *)out->data[p] + slice_start * dst_linesize;       \
 194                                                                              \
 195         for (int y = slice_start; y < slice_end; y++) {                      \
 196             for (int x = 0; x < width; x++) {                                \
 197                 const float sx = x + vsub * shx * y / hsub - wx;             \
 198                 const float sy = y + hsub * shy * x / vsub - wy;             \
 199                                                                              \
 200                 if (sx >= 0 && sx < width - 1 &&                             \
 201                     sy >= 0 && sy < height - 1) {                            \
 202                     float sum = 0.f;                                         \
 203                     int ax = floorf(sx);                                     \
 204                     int ay = floorf(sy);                                     \
 205                     float du = sx - ax;                                      \
 206                     float dv = sy - ay;                                      \
 207                     int bx = FFMIN(ax + 1, width - 1);                       \
 208                     int by = FFMIN(ay + 1, height - 1);                      \
 209                                                                              \
 210                     sum += (1.f - du) * (1.f - dv) * src[ay * src_linesize + ax];\
 211                     sum += (      du) * (1.f - dv) * src[ay * src_linesize + bx];\
 212                     sum += (1.f - du) * (      dv) * src[by * src_linesize + ax];\
 213                     sum += (      du) * (      dv) * src[by * src_linesize + bx];\
 214                     dst[x] = av_clip_uintp2_c(lrintf(sum), depth);           \
 215                 }                                                            \
 216             }                                                                \
 217                                                                              \
 218             dst += dst_linesize;                                             \
 219         }                                                                    \
 220     }                                                                        \
 221                                                                              \
 222     return 0;                                                                \
 223 }
 224
 225 BL(uint8_t, 8)
 226 BL(uint16_t, 16)
 227
 228 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 229 {
 230     AVFilterContext *ctx = inlink->dst;
 231     ShearContext *s = ctx->priv;
 232     AVFilterLink *outlink = ctx->outputs[0];
 233     ThreadData td;
 234     AVFrame *out;
 235
 236     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 237     if (!out) {
 238         av_frame_free(&in);
 239         return AVERROR(ENOMEM);
 240     }
 241     av_frame_copy_props(out, in);
 242
 243     /* fill background */
 244     if (s->fillcolor_enable)
 245         ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
 246                           0, 0, outlink->w, outlink->h);
 247
 248     td.in = in, td.out = out;
 249     ctx->internal->execute(ctx, s->filter_slice[s->interp], &td, NULL, FFMIN(s->planeheight[1], ff_filter_get_nb_threads(ctx)));
 250
 251     av_frame_free(&in);
 252     return ff_filter_frame(outlink, out);
 253 }
 254
 255 static int config_output(AVFilterLink *outlink)
 256 {
 257     AVFilterContext *ctx = outlink->src;
 258     ShearContext *s = ctx->priv;
 259     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
 260
 261     s->nb_planes = av_pix_fmt_count_planes(outlink->format);
 262     s->depth = desc->comp[0].depth;
 263     s->hsub = 1 << desc->log2_chroma_w;
 264     s->vsub = 1 << desc->log2_chroma_h;
 265     s->planewidth[1]  = s->planewidth[2] = AV_CEIL_RSHIFT(ctx->inputs[0]->w, desc->log2_chroma_w);
 266     s->planewidth[0]  = s->planewidth[3] = ctx->inputs[0]->w;
 267     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(ctx->inputs[0]->h, desc->log2_chroma_h);
 268     s->planeheight[0] = s->planeheight[3] = ctx->inputs[0]->h;
 269
 270     ff_draw_init(&s->draw, outlink->format, 0);
 271     ff_draw_color(&s->draw, &s->color, s->fillcolor);
 272
 273     s->filter_slice[0] = s->depth <= 8 ? filter_slice_nn8 : filter_slice_nn16;
 274     s->filter_slice[1] = s->depth <= 8 ? filter_slice_bl8 : filter_slice_bl16;
 275
 276     return 0;
 277 }
 278
 279 static int process_command(AVFilterContext *ctx,
 280                            const char *cmd,
 281                            const char *arg,
 282                            char *res,
 283                            int res_len,
 284                            int flags)
 285 {
 286     ShearContext *s = ctx->priv;
 287     int ret;
 288
 289     ret = ff_filter_process_command(ctx, cmd, arg, res, res_len, flags);
 290     if (ret < 0)
 291         return ret;
 292
 293     ret = init(ctx);
 294     if (ret < 0)
 295         return ret;
 296     ff_draw_color(&s->draw, &s->color, s->fillcolor);
 297
 298     return 0;
 299 }
 300
 301 static const AVFilterPad inputs[] = {
 302     {
 303         .name         = "default",
 304         .type         = AVMEDIA_TYPE_VIDEO,
 305         .filter_frame = filter_frame,
 306     },
 307     { NULL }
 308 };
 309
 310 static const AVFilterPad outputs[] = {
 311     {
 312         .name         = "default",
 313         .type         = AVMEDIA_TYPE_VIDEO,
 314         .config_props = config_output,
 315     },
 316     { NULL }
 317 };
 318
 319 const AVFilter ff_vf_shear = {
 320     .name            = "shear",
 321     .description     = NULL_IF_CONFIG_SMALL("Shear transform the input image."),
 322     .priv_size       = sizeof(ShearContext),
 323     .init            = init,
 324     .query_formats   = query_formats,
 325     .inputs          = inputs,
 326     .outputs         = outputs,
 327     .priv_class      = &shear_class,
 328     .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
 329     .process_command = process_command,
 330 };