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

   1 /*
   2  * Copyright (c) 2018 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 /*
  22  * Based on paper: A Simple and Efficient Deblocking Algorithm for Low Bit-Rate Video Coding.
  23  */
  24
  25 #include "libavutil/imgutils.h"
  26 #include "libavutil/opt.h"
  27 #include "libavutil/pixdesc.h"
  28
  29 #include "avfilter.h"
  30 #include "formats.h"
  31 #include "internal.h"
  32 #include "video.h"
  33
  34 enum FilterType { WEAK, STRONG, NB_FILTER };
  35
  36 typedef struct DeblockContext {
  37     const AVClass *class;
  38     const AVPixFmtDescriptor *desc;
  39     int filter;
  40     int block;
  41     int planes;
  42     float alpha;
  43     float beta;
  44     float gamma;
  45     float delta;
  46
  47     int ath;
  48     int bth;
  49     int gth;
  50     int dth;
  51     int max;
  52     int depth;
  53     int bpc;
  54     int nb_planes;
  55     int planewidth[4];
  56     int planeheight[4];
  57
  58     void (*deblockh)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
  59                      int ath, int bth, int gth, int dth, int max);
  60     void (*deblockv)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
  61                      int ath, int bth, int gth, int dth, int max);
  62 } DeblockContext;
  63
  64 static int query_formats(AVFilterContext *ctx)
  65 {
  66     static const enum AVPixelFormat pixel_fmts[] = {
  67         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
  68         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
  69         AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
  70         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
  71         AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
  72         AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
  73         AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
  74         AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
  75         AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
  76         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
  77         AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
  78         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
  79         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
  80         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
  81         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
  82         AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
  83         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
  84         AV_PIX_FMT_NONE
  85     };
  86     AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
  87     if (!formats)
  88         return AVERROR(ENOMEM);
  89     return ff_set_common_formats(ctx, formats);
  90 }
  91
  92 #define WEAK_HFILTER(name, type, ldiv)                                              \
  93 static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
  94                                   int ath, int bth, int gth, int dth, int max)      \
  95 {                                                                                   \
  96     type *dst;                                                                      \
  97     int x;                                                                          \
  98                                                                                     \
  99     dst = (type *)dstp;                                                             \
 100     dst_linesize /= ldiv;                                                           \
 101                                                                                     \
 102     for (x = 0; x < block; x++) {                                                   \
 103         int delta = dst[x] - dst[x - dst_linesize];                                 \
 104         int A, B, C, D, a, b, c, d;                                                 \
 105                                                                                     \
 106         if (FFABS(delta) >= ath ||                                                  \
 107             FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth ||  \
 108             FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= gth)    \
 109             continue;                                                               \
 110                                                                                     \
 111         A = dst[x - 2 * dst_linesize];                                              \
 112         B = dst[x - 1 * dst_linesize];                                              \
 113         C = dst[x + 0 * dst_linesize];                                              \
 114         D = dst[x + 1 * dst_linesize];                                              \
 115                                                                                     \
 116         a = A + delta / 8;                                                          \
 117         b = B + delta / 2;                                                          \
 118         c = C - delta / 2;                                                          \
 119         d = D - delta / 8;                                                          \
 120                                                                                     \
 121         dst[x - 2 * dst_linesize] = av_clip(a, 0, max);                             \
 122         dst[x - 1 * dst_linesize] = av_clip(b, 0, max);                             \
 123         dst[x + 0 * dst_linesize] = av_clip(c, 0, max);                             \
 124         dst[x + 1 * dst_linesize] = av_clip(d, 0, max);                             \
 125     }                                                                               \
 126 }
 127
 128 WEAK_HFILTER(8, uint8_t, 1)
 129 WEAK_HFILTER(16, uint16_t, 2)
 130
 131 #define WEAK_VFILTER(name, type, ldiv)                                              \
 132 static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
 133                                   int ath, int bth, int gth, int dth, int max)      \
 134 {                                                                                   \
 135     type *dst;                                                                      \
 136     int y;                                                                          \
 137                                                                                     \
 138     dst = (type *)dstp;                                                             \
 139     dst_linesize /= ldiv;                                                           \
 140                                                                                     \
 141     for (y = 0; y < block; y++) {                                                   \
 142         int delta = dst[0] - dst[-1];                                               \
 143         int A, B, C, D, a, b, c, d;                                                 \
 144                                                                                     \
 145         if (FFABS(delta) >= ath ||                                                  \
 146             FFABS(dst[-1] - dst[-2]) >= bth ||                                      \
 147             FFABS(dst[0] - dst[1]) >= gth)                                          \
 148             continue;                                                               \
 149                                                                                     \
 150         A = dst[-2];                                                                \
 151         B = dst[-1];                                                                \
 152         C = dst[+0];                                                                \
 153         D = dst[+1];                                                                \
 154                                                                                     \
 155         a = A + delta / 8;                                                          \
 156         b = B + delta / 2;                                                          \
 157         c = C - delta / 2;                                                          \
 158         d = D - delta / 8;                                                          \
 159                                                                                     \
 160         dst[-2] = av_clip(a, 0, max);                                               \
 161         dst[-1] = av_clip(b, 0, max);                                               \
 162         dst[+0] = av_clip(c, 0, max);                                               \
 163         dst[+1] = av_clip(d, 0, max);                                               \
 164                                                                                     \
 165         dst += dst_linesize;                                                        \
 166     }                                                                               \
 167 }
 168
 169 WEAK_VFILTER(8, uint8_t, 1)
 170 WEAK_VFILTER(16, uint16_t, 2)
 171
 172 #define STRONG_HFILTER(name, type, ldiv)                                           \
 173 static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
 174                                     int ath, int bth, int gth, int dth, int max)   \
 175 {                                                                                  \
 176     type *dst;                                                                     \
 177     int x;                                                                         \
 178                                                                                    \
 179     dst = (type *)dstp;                                                            \
 180     dst_linesize /= ldiv;                                                          \
 181                                                                                    \
 182     for (x = 0; x < block; x++) {                                                  \
 183         int A, B, C, D, E, F, a, b, c, d, e, f;                                    \
 184         int delta = dst[x] - dst[x - dst_linesize];                                \
 185                                                                                    \
 186         if (FFABS(delta) >= ath ||                                                 \
 187             FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
 188             FFABS(dst[x + 1 * dst_linesize] - dst[x + 2 * dst_linesize]) >= gth || \
 189             FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= dth)   \
 190             continue;                                                              \
 191                                                                                    \
 192         A = dst[x - 3 * dst_linesize];                                             \
 193         B = dst[x - 2 * dst_linesize];                                             \
 194         C = dst[x - 1 * dst_linesize];                                             \
 195         D = dst[x + 0 * dst_linesize];                                             \
 196         E = dst[x + 1 * dst_linesize];                                             \
 197         F = dst[x + 2 * dst_linesize];                                             \
 198                                                                                    \
 199         a = A + delta / 8;                                                         \
 200         b = B + delta / 4;                                                         \
 201         c = C + delta / 2;                                                         \
 202         d = D - delta / 2;                                                         \
 203         e = E - delta / 4;                                                         \
 204         f = F - delta / 8;                                                         \
 205                                                                                    \
 206         dst[x - 3 * dst_linesize] = av_clip(a, 0, max);                            \
 207         dst[x - 2 * dst_linesize] = av_clip(b, 0, max);                            \
 208         dst[x - 1 * dst_linesize] = av_clip(c, 0, max);                            \
 209         dst[x + 0 * dst_linesize] = av_clip(d, 0, max);                            \
 210         dst[x + 1 * dst_linesize] = av_clip(e, 0, max);                            \
 211         dst[x + 2 * dst_linesize] = av_clip(f, 0, max);                            \
 212     }                                                                              \
 213 }
 214
 215 STRONG_HFILTER(8, uint8_t, 1)
 216 STRONG_HFILTER(16, uint16_t, 2)
 217
 218 #define STRONG_VFILTER(name, type, ldiv)                                           \
 219 static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
 220                                     int ath, int bth, int gth, int dth, int max)   \
 221 {                                                                                  \
 222     type *dst;                                                                     \
 223     int y;                                                                         \
 224                                                                                    \
 225     dst = (type *)dstp;                                                            \
 226     dst_linesize /= ldiv;                                                          \
 227                                                                                    \
 228     for (y = 0; y < block; y++) {                                                  \
 229         int A, B, C, D, E, F, a, b, c, d, e, f;                                    \
 230         int delta = dst[0] - dst[-1];                                              \
 231                                                                                    \
 232         if (FFABS(delta) >= ath ||                                                 \
 233             FFABS(dst[-1] - dst[-2]) >= bth ||                                     \
 234             FFABS(dst[+1] - dst[+2]) >= gth ||                                     \
 235             FFABS(dst[+0] - dst[+1]) >= dth)                                       \
 236             continue;                                                              \
 237                                                                                    \
 238         A = dst[-3];                                                               \
 239         B = dst[-2];                                                               \
 240         C = dst[-1];                                                               \
 241         D = dst[+0];                                                               \
 242         E = dst[+1];                                                               \
 243         F = dst[+2];                                                               \
 244                                                                                    \
 245         a = A + delta / 8;                                                         \
 246         b = B + delta / 4;                                                         \
 247         c = C + delta / 2;                                                         \
 248         d = D - delta / 2;                                                         \
 249         e = E - delta / 4;                                                         \
 250         f = F - delta / 8;                                                         \
 251                                                                                    \
 252         dst[-3] = av_clip(a, 0, max);                                              \
 253         dst[-2] = av_clip(b, 0, max);                                              \
 254         dst[-1] = av_clip(c, 0, max);                                              \
 255         dst[+0] = av_clip(d, 0, max);                                              \
 256         dst[+1] = av_clip(e, 0, max);                                              \
 257         dst[+2] = av_clip(f, 0, max);                                              \
 258                                                                                    \
 259         dst += dst_linesize;                                                       \
 260     }                                                                              \
 261 }
 262
 263 STRONG_VFILTER(8, uint8_t, 1)
 264 STRONG_VFILTER(16, uint16_t, 2)
 265
 266 static int config_output(AVFilterLink *outlink)
 267 {
 268     AVFilterContext *ctx = outlink->src;
 269     DeblockContext *s = ctx->priv;
 270     AVFilterLink *inlink = ctx->inputs[0];
 271
 272     s->desc = av_pix_fmt_desc_get(outlink->format);
 273     if (!s->desc)
 274         return AVERROR_BUG;
 275     s->nb_planes = av_pix_fmt_count_planes(outlink->format);
 276     s->depth = s->desc->comp[0].depth;
 277     s->bpc = (s->depth + 7) / 8;
 278     s->max = (1 << s->depth) - 1;
 279     s->ath = s->alpha * s->max;
 280     s->bth = s->beta  * s->max;
 281     s->gth = s->gamma * s->max;
 282     s->dth = s->delta * s->max;
 283
 284     if (s->depth <= 8 && s->filter == WEAK) {
 285         s->deblockh = deblockh8_weak;
 286         s->deblockv = deblockv8_weak;
 287     } else if (s->depth >= 8 && s->filter == WEAK) {
 288         s->deblockh = deblockh16_weak;
 289         s->deblockv = deblockv16_weak;
 290     }
 291     if (s->depth <= 8 && s->filter == STRONG) {
 292         s->deblockh = deblockh8_strong;
 293         s->deblockv = deblockv8_strong;
 294     } else if (s->depth >= 8 && s->filter == STRONG) {
 295         s->deblockh = deblockh16_strong;
 296         s->deblockv = deblockv16_strong;
 297     }
 298
 299     s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
 300     s->planewidth[0] = s->planewidth[3] = inlink->w;
 301
 302     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
 303     s->planeheight[0] = s->planeheight[3] = inlink->h;
 304
 305     return 0;
 306 }
 307
 308 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 309 {
 310     AVFilterContext *ctx = inlink->dst;
 311     AVFilterLink *outlink = ctx->outputs[0];
 312     DeblockContext *s = ctx->priv;
 313     const int block = s->block;
 314     AVFrame *out;
 315     int plane, x, y;
 316
 317     if (av_frame_is_writable(in)) {
 318         out = in;
 319     } else {
 320         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 321         if (!out) {
 322             av_frame_free(&in);
 323             return AVERROR(ENOMEM);
 324         }
 325         av_frame_copy_props(out, in);
 326     }
 327
 328     for (plane = 0; plane < s->nb_planes; plane++) {
 329         const int width = s->planewidth[plane];
 330         const int height = s->planeheight[plane];
 331         const uint8_t *src = (const uint8_t *)in->data[plane];
 332         uint8_t *dst = (uint8_t *)out->data[plane];
 333
 334         if (in != out)
 335             av_image_copy_plane(dst, out->linesize[plane],
 336                                 src, in->linesize[plane],
 337                                 width * s->bpc, height);
 338
 339         if (!((1 << plane) & s->planes))
 340             continue;
 341
 342         for (x = block; x < width; x += block)
 343             s->deblockv(dst + x * s->bpc, out->linesize[plane],
 344                         FFMIN(block, height), s->ath, s->bth, s->gth, s->dth, s->max);
 345
 346         for (y = block; y < height; y += block) {
 347             dst += out->linesize[plane] * block;
 348
 349             s->deblockh(dst, out->linesize[plane],
 350                         FFMIN(block, width),
 351                         s->ath, s->bth, s->gth, s->dth, s->max);
 352
 353             for (x = block; x < width; x += block) {
 354                 s->deblockh(dst + x * s->bpc, out->linesize[plane],
 355                             FFMIN(block, width - x),
 356                             s->ath, s->bth, s->gth, s->dth, s->max);
 357                 s->deblockv(dst + x * s->bpc, out->linesize[plane],
 358                             FFMIN(block, height - y),
 359                             s->ath, s->bth, s->gth, s->dth, s->max);
 360             }
 361         }
 362     }
 363
 364     if (in != out)
 365         av_frame_free(&in);
 366     return ff_filter_frame(outlink, out);
 367 }
 368
 369 #define OFFSET(x) offsetof(DeblockContext, x)
 370 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
 371
 372 static const AVOption deblock_options[] = {
 373     { "filter",    "set type of filter",          OFFSET(filter),    AV_OPT_TYPE_INT,   {.i64=STRONG},0, 1,  FLAGS, "filter" },
 374     { "weak",      0,                             0,                 AV_OPT_TYPE_CONST, {.i64=WEAK},  0, 0,  FLAGS, "filter" },
 375     { "strong",    0,                             0,                 AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0,  FLAGS, "filter" },
 376     { "block",     "set size of block",           OFFSET(block),     AV_OPT_TYPE_INT,   {.i64=8},    4, 512, FLAGS },
 377     { "alpha",     "set 1st detection threshold", OFFSET(alpha),     AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0,  1,  FLAGS },
 378     { "beta",      "set 2nd detection threshold", OFFSET(beta),      AV_OPT_TYPE_FLOAT, {.dbl=.05},  0,  1,  FLAGS },
 379     { "gamma",     "set 3rd detection threshold", OFFSET(gamma),     AV_OPT_TYPE_FLOAT, {.dbl=.05},  0,  1,  FLAGS },
 380     { "delta",     "set 4th detection threshold", OFFSET(delta),     AV_OPT_TYPE_FLOAT, {.dbl=.05},  0,  1,  FLAGS },
 381     { "planes",    "set planes to filter",        OFFSET(planes),    AV_OPT_TYPE_INT,   {.i64=15},   0, 15,  FLAGS },
 382     { NULL },
 383 };
 384
 385 static const AVFilterPad inputs[] = {
 386     {
 387         .name           = "default",
 388         .type           = AVMEDIA_TYPE_VIDEO,
 389         .filter_frame   = filter_frame,
 390     },
 391     { NULL }
 392 };
 393
 394 static const AVFilterPad outputs[] = {
 395     {
 396         .name          = "default",
 397         .type          = AVMEDIA_TYPE_VIDEO,
 398         .config_props  = config_output,
 399     },
 400     { NULL }
 401 };
 402
 403 AVFILTER_DEFINE_CLASS(deblock);
 404
 405 AVFilter ff_vf_deblock = {
 406     .name          = "deblock",
 407     .description   = NULL_IF_CONFIG_SMALL("Deblock video."),
 408     .priv_size     = sizeof(DeblockContext),
 409     .priv_class    = &deblock_class,
 410     .query_formats = query_formats,
 411     .inputs        = inputs,
 412     .outputs       = outputs,
 413     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
 414 };