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_YUVA422P12, AV_PIX_FMT_YUVA444P12,
  80         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
  81         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
  82         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
  83         AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
  84         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
  85         AV_PIX_FMT_NONE
  86     };
  87     AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
  88     if (!formats)
  89         return AVERROR(ENOMEM);
  90     return ff_set_common_formats(ctx, formats);
  91 }
  92
  93 #define WEAK_HFILTER(name, type, ldiv)                                              \
  94 static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
  95                                   int ath, int bth, int gth, int dth, int max)      \
  96 {                                                                                   \
  97     type *dst;                                                                      \
  98     int x;                                                                          \
  99                                                                                     \
 100     dst = (type *)dstp;                                                             \
 101     dst_linesize /= ldiv;                                                           \
 102                                                                                     \
 103     for (x = 0; x < block; x++) {                                                   \
 104         int delta = dst[x] - dst[x - dst_linesize];                                 \
 105         int A, B, C, D, a, b, c, d;                                                 \
 106                                                                                     \
 107         if (FFABS(delta) >= ath ||                                                  \
 108             FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth ||  \
 109             FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= gth)    \
 110             continue;                                                               \
 111                                                                                     \
 112         A = dst[x - 2 * dst_linesize];                                              \
 113         B = dst[x - 1 * dst_linesize];                                              \
 114         C = dst[x + 0 * dst_linesize];                                              \
 115         D = dst[x + 1 * dst_linesize];                                              \
 116                                                                                     \
 117         a = A + delta / 8;                                                          \
 118         b = B + delta / 2;                                                          \
 119         c = C - delta / 2;                                                          \
 120         d = D - delta / 8;                                                          \
 121                                                                                     \
 122         dst[x - 2 * dst_linesize] = av_clip(a, 0, max);                             \
 123         dst[x - 1 * dst_linesize] = av_clip(b, 0, max);                             \
 124         dst[x + 0 * dst_linesize] = av_clip(c, 0, max);                             \
 125         dst[x + 1 * dst_linesize] = av_clip(d, 0, max);                             \
 126     }                                                                               \
 127 }
 128
 129 WEAK_HFILTER(8, uint8_t, 1)
 130 WEAK_HFILTER(16, uint16_t, 2)
 131
 132 #define WEAK_VFILTER(name, type, ldiv)                                              \
 133 static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
 134                                   int ath, int bth, int gth, int dth, int max)      \
 135 {                                                                                   \
 136     type *dst;                                                                      \
 137     int y;                                                                          \
 138                                                                                     \
 139     dst = (type *)dstp;                                                             \
 140     dst_linesize /= ldiv;                                                           \
 141                                                                                     \
 142     for (y = 0; y < block; y++) {                                                   \
 143         int delta = dst[0] - dst[-1];                                               \
 144         int A, B, C, D, a, b, c, d;                                                 \
 145                                                                                     \
 146         if (FFABS(delta) >= ath ||                                                  \
 147             FFABS(dst[-1] - dst[-2]) >= bth ||                                      \
 148             FFABS(dst[0] - dst[1]) >= gth)                                          \
 149             continue;                                                               \
 150                                                                                     \
 151         A = dst[-2];                                                                \
 152         B = dst[-1];                                                                \
 153         C = dst[+0];                                                                \
 154         D = dst[+1];                                                                \
 155                                                                                     \
 156         a = A + delta / 8;                                                          \
 157         b = B + delta / 2;                                                          \
 158         c = C - delta / 2;                                                          \
 159         d = D - delta / 8;                                                          \
 160                                                                                     \
 161         dst[-2] = av_clip(a, 0, max);                                               \
 162         dst[-1] = av_clip(b, 0, max);                                               \
 163         dst[+0] = av_clip(c, 0, max);                                               \
 164         dst[+1] = av_clip(d, 0, max);                                               \
 165                                                                                     \
 166         dst += dst_linesize;                                                        \
 167     }                                                                               \
 168 }
 169
 170 WEAK_VFILTER(8, uint8_t, 1)
 171 WEAK_VFILTER(16, uint16_t, 2)
 172
 173 #define STRONG_HFILTER(name, type, ldiv)                                           \
 174 static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
 175                                     int ath, int bth, int gth, int dth, int max)   \
 176 {                                                                                  \
 177     type *dst;                                                                     \
 178     int x;                                                                         \
 179                                                                                    \
 180     dst = (type *)dstp;                                                            \
 181     dst_linesize /= ldiv;                                                          \
 182                                                                                    \
 183     for (x = 0; x < block; x++) {                                                  \
 184         int A, B, C, D, E, F, a, b, c, d, e, f;                                    \
 185         int delta = dst[x] - dst[x - dst_linesize];                                \
 186                                                                                    \
 187         if (FFABS(delta) >= ath ||                                                 \
 188             FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
 189             FFABS(dst[x + 1 * dst_linesize] - dst[x + 2 * dst_linesize]) >= gth || \
 190             FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= dth)   \
 191             continue;                                                              \
 192                                                                                    \
 193         A = dst[x - 3 * dst_linesize];                                             \
 194         B = dst[x - 2 * dst_linesize];                                             \
 195         C = dst[x - 1 * dst_linesize];                                             \
 196         D = dst[x + 0 * dst_linesize];                                             \
 197         E = dst[x + 1 * dst_linesize];                                             \
 198         F = dst[x + 2 * dst_linesize];                                             \
 199                                                                                    \
 200         a = A + delta / 8;                                                         \
 201         b = B + delta / 4;                                                         \
 202         c = C + delta / 2;                                                         \
 203         d = D - delta / 2;                                                         \
 204         e = E - delta / 4;                                                         \
 205         f = F - delta / 8;                                                         \
 206                                                                                    \
 207         dst[x - 3 * dst_linesize] = av_clip(a, 0, max);                            \
 208         dst[x - 2 * dst_linesize] = av_clip(b, 0, max);                            \
 209         dst[x - 1 * dst_linesize] = av_clip(c, 0, max);                            \
 210         dst[x + 0 * dst_linesize] = av_clip(d, 0, max);                            \
 211         dst[x + 1 * dst_linesize] = av_clip(e, 0, max);                            \
 212         dst[x + 2 * dst_linesize] = av_clip(f, 0, max);                            \
 213     }                                                                              \
 214 }
 215
 216 STRONG_HFILTER(8, uint8_t, 1)
 217 STRONG_HFILTER(16, uint16_t, 2)
 218
 219 #define STRONG_VFILTER(name, type, ldiv)                                           \
 220 static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
 221                                     int ath, int bth, int gth, int dth, int max)   \
 222 {                                                                                  \
 223     type *dst;                                                                     \
 224     int y;                                                                         \
 225                                                                                    \
 226     dst = (type *)dstp;                                                            \
 227     dst_linesize /= ldiv;                                                          \
 228                                                                                    \
 229     for (y = 0; y < block; y++) {                                                  \
 230         int A, B, C, D, E, F, a, b, c, d, e, f;                                    \
 231         int delta = dst[0] - dst[-1];                                              \
 232                                                                                    \
 233         if (FFABS(delta) >= ath ||                                                 \
 234             FFABS(dst[-1] - dst[-2]) >= bth ||                                     \
 235             FFABS(dst[+1] - dst[+2]) >= gth ||                                     \
 236             FFABS(dst[+0] - dst[+1]) >= dth)                                       \
 237             continue;                                                              \
 238                                                                                    \
 239         A = dst[-3];                                                               \
 240         B = dst[-2];                                                               \
 241         C = dst[-1];                                                               \
 242         D = dst[+0];                                                               \
 243         E = dst[+1];                                                               \
 244         F = dst[+2];                                                               \
 245                                                                                    \
 246         a = A + delta / 8;                                                         \
 247         b = B + delta / 4;                                                         \
 248         c = C + delta / 2;                                                         \
 249         d = D - delta / 2;                                                         \
 250         e = E - delta / 4;                                                         \
 251         f = F - delta / 8;                                                         \
 252                                                                                    \
 253         dst[-3] = av_clip(a, 0, max);                                              \
 254         dst[-2] = av_clip(b, 0, max);                                              \
 255         dst[-1] = av_clip(c, 0, max);                                              \
 256         dst[+0] = av_clip(d, 0, max);                                              \
 257         dst[+1] = av_clip(e, 0, max);                                              \
 258         dst[+2] = av_clip(f, 0, max);                                              \
 259                                                                                    \
 260         dst += dst_linesize;                                                       \
 261     }                                                                              \
 262 }
 263
 264 STRONG_VFILTER(8, uint8_t, 1)
 265 STRONG_VFILTER(16, uint16_t, 2)
 266
 267 static int config_output(AVFilterLink *outlink)
 268 {
 269     AVFilterContext *ctx = outlink->src;
 270     DeblockContext *s = ctx->priv;
 271     AVFilterLink *inlink = ctx->inputs[0];
 272
 273     s->desc = av_pix_fmt_desc_get(outlink->format);
 274     if (!s->desc)
 275         return AVERROR_BUG;
 276     s->nb_planes = av_pix_fmt_count_planes(outlink->format);
 277     s->depth = s->desc->comp[0].depth;
 278     s->bpc = (s->depth + 7) / 8;
 279     s->max = (1 << s->depth) - 1;
 280     s->ath = s->alpha * s->max;
 281     s->bth = s->beta  * s->max;
 282     s->gth = s->gamma * s->max;
 283     s->dth = s->delta * s->max;
 284
 285     if (s->depth <= 8 && s->filter == WEAK) {
 286         s->deblockh = deblockh8_weak;
 287         s->deblockv = deblockv8_weak;
 288     } else if (s->depth > 8 && s->filter == WEAK) {
 289         s->deblockh = deblockh16_weak;
 290         s->deblockv = deblockv16_weak;
 291     }
 292     if (s->depth <= 8 && s->filter == STRONG) {
 293         s->deblockh = deblockh8_strong;
 294         s->deblockv = deblockv8_strong;
 295     } else if (s->depth > 8 && s->filter == STRONG) {
 296         s->deblockh = deblockh16_strong;
 297         s->deblockv = deblockv16_strong;
 298     }
 299
 300     s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
 301     s->planewidth[0] = s->planewidth[3] = inlink->w;
 302
 303     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
 304     s->planeheight[0] = s->planeheight[3] = inlink->h;
 305
 306     return 0;
 307 }
 308
 309 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 310 {
 311     AVFilterContext *ctx = inlink->dst;
 312     AVFilterLink *outlink = ctx->outputs[0];
 313     DeblockContext *s = ctx->priv;
 314     const int block = s->block;
 315     AVFrame *out;
 316     int plane, x, y;
 317
 318     if (av_frame_is_writable(in)) {
 319         out = in;
 320     } else {
 321         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 322         if (!out) {
 323             av_frame_free(&in);
 324             return AVERROR(ENOMEM);
 325         }
 326         av_frame_copy_props(out, in);
 327     }
 328
 329     for (plane = 0; plane < s->nb_planes; plane++) {
 330         const int width = s->planewidth[plane];
 331         const int height = s->planeheight[plane];
 332         const uint8_t *src = (const uint8_t *)in->data[plane];
 333         uint8_t *dst = (uint8_t *)out->data[plane];
 334
 335         if (in != out)
 336             av_image_copy_plane(dst, out->linesize[plane],
 337                                 src, in->linesize[plane],
 338                                 width * s->bpc, height);
 339
 340         if (!((1 << plane) & s->planes))
 341             continue;
 342
 343         for (x = block; x < width; x += block)
 344             s->deblockv(dst + x * s->bpc, out->linesize[plane],
 345                         FFMIN(block, height), s->ath, s->bth, s->gth, s->dth, s->max);
 346
 347         for (y = block; y < height; y += block) {
 348             dst += out->linesize[plane] * block;
 349
 350             s->deblockh(dst, out->linesize[plane],
 351                         FFMIN(block, width),
 352                         s->ath, s->bth, s->gth, s->dth, s->max);
 353
 354             for (x = block; x < width; x += block) {
 355                 s->deblockh(dst + x * s->bpc, out->linesize[plane],
 356                             FFMIN(block, width - x),
 357                             s->ath, s->bth, s->gth, s->dth, s->max);
 358                 s->deblockv(dst + x * s->bpc, out->linesize[plane],
 359                             FFMIN(block, height - y),
 360                             s->ath, s->bth, s->gth, s->dth, s->max);
 361             }
 362         }
 363     }
 364
 365     if (in != out)
 366         av_frame_free(&in);
 367     return ff_filter_frame(outlink, out);
 368 }
 369
 370 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
 371                            char *res, int res_len, int flags)
 372 {
 373     int ret;
 374
 375     ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
 376     if (ret < 0)
 377         return ret;
 378
 379     return config_output(ctx->outputs[0]);
 380 }
 381
 382 #define OFFSET(x) offsetof(DeblockContext, x)
 383 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
 384
 385 static const AVOption deblock_options[] = {
 386     { "filter",    "set type of filter",          OFFSET(filter),    AV_OPT_TYPE_INT,   {.i64=STRONG},0, 1,  FLAGS, "filter" },
 387     { "weak",      0,                             0,                 AV_OPT_TYPE_CONST, {.i64=WEAK},  0, 0,  FLAGS, "filter" },
 388     { "strong",    0,                             0,                 AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0,  FLAGS, "filter" },
 389     { "block",     "set size of block",           OFFSET(block),     AV_OPT_TYPE_INT,   {.i64=8},    4, 512, FLAGS },
 390     { "alpha",     "set 1st detection threshold", OFFSET(alpha),     AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0,  1,  FLAGS },
 391     { "beta",      "set 2nd detection threshold", OFFSET(beta),      AV_OPT_TYPE_FLOAT, {.dbl=.05},  0,  1,  FLAGS },
 392     { "gamma",     "set 3rd detection threshold", OFFSET(gamma),     AV_OPT_TYPE_FLOAT, {.dbl=.05},  0,  1,  FLAGS },
 393     { "delta",     "set 4th detection threshold", OFFSET(delta),     AV_OPT_TYPE_FLOAT, {.dbl=.05},  0,  1,  FLAGS },
 394     { "planes",    "set planes to filter",        OFFSET(planes),    AV_OPT_TYPE_INT,   {.i64=15},   0, 15,  FLAGS },
 395     { NULL },
 396 };
 397
 398 static const AVFilterPad inputs[] = {
 399     {
 400         .name           = "default",
 401         .type           = AVMEDIA_TYPE_VIDEO,
 402         .filter_frame   = filter_frame,
 403     },
 404     { NULL }
 405 };
 406
 407 static const AVFilterPad outputs[] = {
 408     {
 409         .name          = "default",
 410         .type          = AVMEDIA_TYPE_VIDEO,
 411         .config_props  = config_output,
 412     },
 413     { NULL }
 414 };
 415
 416 AVFILTER_DEFINE_CLASS(deblock);
 417
 418 AVFilter ff_vf_deblock = {
 419     .name          = "deblock",
 420     .description   = NULL_IF_CONFIG_SMALL("Deblock video."),
 421     .priv_size     = sizeof(DeblockContext),
 422     .priv_class    = &deblock_class,
 423     .query_formats = query_formats,
 424     .inputs        = inputs,
 425     .outputs       = outputs,
 426     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
 427     .process_command = process_command,
 428 };