| 1 | /* |
| 2 | * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (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 |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * @file |
| 23 | * Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c |
| 24 | */ |
| 25 | |
| 26 | #include "libavutil/opt.h" |
| 27 | #include "libavutil/pixdesc.h" |
| 28 | #include "libswscale/swscale.h" |
| 29 | |
| 30 | #include "avfilter.h" |
| 31 | #include "formats.h" |
| 32 | #include "internal.h" |
| 33 | |
| 34 | typedef struct { |
| 35 | float radius; |
| 36 | float pre_filter_radius; |
| 37 | float strength; |
| 38 | float quality; |
| 39 | struct SwsContext *pre_filter_context; |
| 40 | uint8_t *pre_filter_buf; |
| 41 | int pre_filter_linesize; |
| 42 | int dist_width; |
| 43 | int dist_linesize; |
| 44 | int *dist_coeff; |
| 45 | #define COLOR_DIFF_COEFF_SIZE 512 |
| 46 | int color_diff_coeff[COLOR_DIFF_COEFF_SIZE]; |
| 47 | } FilterParam; |
| 48 | |
| 49 | typedef struct { |
| 50 | const AVClass *class; |
| 51 | FilterParam luma; |
| 52 | FilterParam chroma; |
| 53 | int hsub; |
| 54 | int vsub; |
| 55 | unsigned int sws_flags; |
| 56 | } SabContext; |
| 57 | |
| 58 | static int query_formats(AVFilterContext *ctx) |
| 59 | { |
| 60 | static const enum AVPixelFormat pix_fmts[] = { |
| 61 | AV_PIX_FMT_YUV420P, |
| 62 | AV_PIX_FMT_YUV410P, |
| 63 | AV_PIX_FMT_YUV444P, |
| 64 | AV_PIX_FMT_YUV422P, |
| 65 | AV_PIX_FMT_YUV411P, |
| 66 | AV_PIX_FMT_NONE |
| 67 | }; |
| 68 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | #define RADIUS_MIN 0.1 |
| 74 | #define RADIUS_MAX 4.0 |
| 75 | |
| 76 | #define PRE_FILTER_RADIUS_MIN 0.1 |
| 77 | #define PRE_FILTER_RADIUS_MAX 2.0 |
| 78 | |
| 79 | #define STRENGTH_MIN 0.1 |
| 80 | #define STRENGTH_MAX 100.0 |
| 81 | |
| 82 | #define OFFSET(x) offsetof(SabContext, x) |
| 83 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 84 | |
| 85 | static const AVOption sab_options[] = { |
| 86 | { "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
| 87 | { "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
| 88 | { "luma_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
| 89 | { "lpfr", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
| 90 | { "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
| 91 | { "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
| 92 | |
| 93 | { "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
| 94 | { "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
| 95 | { "chroma_pre_filter_radius", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, |
| 96 | PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
| 97 | { "cpfr", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, |
| 98 | PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
| 99 | { "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
| 100 | { "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
| 101 | |
| 102 | { NULL } |
| 103 | }; |
| 104 | |
| 105 | AVFILTER_DEFINE_CLASS(sab); |
| 106 | |
| 107 | static av_cold int init(AVFilterContext *ctx) |
| 108 | { |
| 109 | SabContext *sab = ctx->priv; |
| 110 | |
| 111 | /* make chroma default to luma values, if not explicitly set */ |
| 112 | if (sab->chroma.radius < RADIUS_MIN) |
| 113 | sab->chroma.radius = sab->luma.radius; |
| 114 | if (sab->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN) |
| 115 | sab->chroma.pre_filter_radius = sab->luma.pre_filter_radius; |
| 116 | if (sab->chroma.strength < STRENGTH_MIN) |
| 117 | sab->chroma.strength = sab->luma.strength; |
| 118 | |
| 119 | sab->luma.quality = sab->chroma.quality = 3.0; |
| 120 | sab->sws_flags = SWS_POINT; |
| 121 | |
| 122 | av_log(ctx, AV_LOG_VERBOSE, |
| 123 | "luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f " |
| 124 | "chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n", |
| 125 | sab->luma .radius, sab->luma .pre_filter_radius, sab->luma .strength, |
| 126 | sab->chroma.radius, sab->chroma.pre_filter_radius, sab->chroma.strength); |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | static void close_filter_param(FilterParam *f) |
| 131 | { |
| 132 | if (f->pre_filter_context) { |
| 133 | sws_freeContext(f->pre_filter_context); |
| 134 | f->pre_filter_context = NULL; |
| 135 | } |
| 136 | av_freep(&f->pre_filter_buf); |
| 137 | av_freep(&f->dist_coeff); |
| 138 | } |
| 139 | |
| 140 | static av_cold void uninit(AVFilterContext *ctx) |
| 141 | { |
| 142 | SabContext *sab = ctx->priv; |
| 143 | |
| 144 | close_filter_param(&sab->luma); |
| 145 | close_filter_param(&sab->chroma); |
| 146 | } |
| 147 | |
| 148 | static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags) |
| 149 | { |
| 150 | SwsVector *vec; |
| 151 | SwsFilter sws_f; |
| 152 | int i, x, y; |
| 153 | int linesize = FFALIGN(width, 8); |
| 154 | |
| 155 | f->pre_filter_buf = av_malloc(linesize * height); |
| 156 | if (!f->pre_filter_buf) |
| 157 | return AVERROR(ENOMEM); |
| 158 | |
| 159 | f->pre_filter_linesize = linesize; |
| 160 | vec = sws_getGaussianVec(f->pre_filter_radius, f->quality); |
| 161 | sws_f.lumH = sws_f.lumV = vec; |
| 162 | sws_f.chrH = sws_f.chrV = NULL; |
| 163 | f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8, |
| 164 | width, height, AV_PIX_FMT_GRAY8, |
| 165 | sws_flags, &sws_f, NULL, NULL); |
| 166 | sws_freeVec(vec); |
| 167 | |
| 168 | vec = sws_getGaussianVec(f->strength, 5.0); |
| 169 | for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) { |
| 170 | double d; |
| 171 | int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2; |
| 172 | |
| 173 | if (index < 0 || index >= vec->length) d = 0.0; |
| 174 | else d = vec->coeff[index]; |
| 175 | |
| 176 | f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5); |
| 177 | } |
| 178 | sws_freeVec(vec); |
| 179 | |
| 180 | vec = sws_getGaussianVec(f->radius, f->quality); |
| 181 | f->dist_width = vec->length; |
| 182 | f->dist_linesize = FFALIGN(vec->length, 8); |
| 183 | f->dist_coeff = av_malloc_array(f->dist_width, f->dist_linesize * sizeof(*f->dist_coeff)); |
| 184 | if (!f->dist_coeff) { |
| 185 | sws_freeVec(vec); |
| 186 | return AVERROR(ENOMEM); |
| 187 | } |
| 188 | |
| 189 | for (y = 0; y < vec->length; y++) { |
| 190 | for (x = 0; x < vec->length; x++) { |
| 191 | double d = vec->coeff[x] * vec->coeff[y]; |
| 192 | f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5); |
| 193 | } |
| 194 | } |
| 195 | sws_freeVec(vec); |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static int config_props(AVFilterLink *inlink) |
| 201 | { |
| 202 | SabContext *sab = inlink->dst->priv; |
| 203 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| 204 | int ret; |
| 205 | |
| 206 | sab->hsub = desc->log2_chroma_w; |
| 207 | sab->vsub = desc->log2_chroma_h; |
| 208 | |
| 209 | close_filter_param(&sab->luma); |
| 210 | ret = open_filter_param(&sab->luma, inlink->w, inlink->h, sab->sws_flags); |
| 211 | if (ret < 0) |
| 212 | return ret; |
| 213 | |
| 214 | close_filter_param(&sab->chroma); |
| 215 | ret = open_filter_param(&sab->chroma, |
| 216 | FF_CEIL_RSHIFT(inlink->w, sab->hsub), |
| 217 | FF_CEIL_RSHIFT(inlink->h, sab->vsub), sab->sws_flags); |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | #define NB_PLANES 4 |
| 222 | |
| 223 | static void blur(uint8_t *dst, const int dst_linesize, |
| 224 | const uint8_t *src, const int src_linesize, |
| 225 | const int w, const int h, FilterParam *fp) |
| 226 | { |
| 227 | int x, y; |
| 228 | FilterParam f = *fp; |
| 229 | const int radius = f.dist_width/2; |
| 230 | |
| 231 | const uint8_t * const src2[NB_PLANES] = { src }; |
| 232 | int src2_linesize[NB_PLANES] = { src_linesize }; |
| 233 | uint8_t *dst2[NB_PLANES] = { f.pre_filter_buf }; |
| 234 | int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize }; |
| 235 | |
| 236 | sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize); |
| 237 | |
| 238 | #define UPDATE_FACTOR do { \ |
| 239 | int factor; \ |
| 240 | factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \ |
| 241 | f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \ |
| 242 | sum += src[ix + iy*src_linesize] * factor; \ |
| 243 | div += factor; \ |
| 244 | } while (0) |
| 245 | |
| 246 | for (y = 0; y < h; y++) { |
| 247 | for (x = 0; x < w; x++) { |
| 248 | int sum = 0; |
| 249 | int div = 0; |
| 250 | int dy; |
| 251 | const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize]; |
| 252 | if (x >= radius && x < w - radius) { |
| 253 | for (dy = 0; dy < radius*2 + 1; dy++) { |
| 254 | int dx; |
| 255 | int iy = y+dy - radius; |
| 256 | if (iy < 0) iy = -iy; |
| 257 | else if (iy >= h) iy = h+h-iy-1; |
| 258 | |
| 259 | for (dx = 0; dx < radius*2 + 1; dx++) { |
| 260 | const int ix = x+dx - radius; |
| 261 | UPDATE_FACTOR; |
| 262 | } |
| 263 | } |
| 264 | } else { |
| 265 | for (dy = 0; dy < radius*2+1; dy++) { |
| 266 | int dx; |
| 267 | int iy = y+dy - radius; |
| 268 | if (iy < 0) iy = -iy; |
| 269 | else if (iy >= h) iy = h+h-iy-1; |
| 270 | |
| 271 | for (dx = 0; dx < radius*2 + 1; dx++) { |
| 272 | int ix = x+dx - radius; |
| 273 | if (ix < 0) ix = -ix; |
| 274 | else if (ix >= w) ix = w+w-ix-1; |
| 275 | UPDATE_FACTOR; |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | dst[x + y*dst_linesize] = (sum + div/2) / div; |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) |
| 285 | { |
| 286 | SabContext *sab = inlink->dst->priv; |
| 287 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
| 288 | AVFrame *outpic; |
| 289 | |
| 290 | outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 291 | if (!outpic) { |
| 292 | av_frame_free(&inpic); |
| 293 | return AVERROR(ENOMEM); |
| 294 | } |
| 295 | av_frame_copy_props(outpic, inpic); |
| 296 | |
| 297 | blur(outpic->data[0], outpic->linesize[0], inpic->data[0], inpic->linesize[0], |
| 298 | inlink->w, inlink->h, &sab->luma); |
| 299 | if (inpic->data[2]) { |
| 300 | int cw = FF_CEIL_RSHIFT(inlink->w, sab->hsub); |
| 301 | int ch = FF_CEIL_RSHIFT(inlink->h, sab->vsub); |
| 302 | blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &sab->chroma); |
| 303 | blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &sab->chroma); |
| 304 | } |
| 305 | |
| 306 | av_frame_free(&inpic); |
| 307 | return ff_filter_frame(outlink, outpic); |
| 308 | } |
| 309 | |
| 310 | static const AVFilterPad sab_inputs[] = { |
| 311 | { |
| 312 | .name = "default", |
| 313 | .type = AVMEDIA_TYPE_VIDEO, |
| 314 | .filter_frame = filter_frame, |
| 315 | .config_props = config_props, |
| 316 | }, |
| 317 | { NULL } |
| 318 | }; |
| 319 | |
| 320 | static const AVFilterPad sab_outputs[] = { |
| 321 | { |
| 322 | .name = "default", |
| 323 | .type = AVMEDIA_TYPE_VIDEO, |
| 324 | }, |
| 325 | { NULL } |
| 326 | }; |
| 327 | |
| 328 | AVFilter ff_vf_sab = { |
| 329 | .name = "sab", |
| 330 | .description = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."), |
| 331 | .priv_size = sizeof(SabContext), |
| 332 | .init = init, |
| 333 | .uninit = uninit, |
| 334 | .query_formats = query_formats, |
| 335 | .inputs = sab_inputs, |
| 336 | .outputs = sab_outputs, |
| 337 | .priv_class = &sab_class, |
| 338 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| 339 | }; |