| 1 | /* |
| 2 | * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
| 3 | * Copyright (c) 2012 Jeremy Tran |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Apply a smartblur filter to the input video |
| 25 | * Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer. |
| 26 | */ |
| 27 | |
| 28 | #include "libavutil/opt.h" |
| 29 | #include "libavutil/pixdesc.h" |
| 30 | #include "libswscale/swscale.h" |
| 31 | |
| 32 | #include "avfilter.h" |
| 33 | #include "formats.h" |
| 34 | #include "internal.h" |
| 35 | |
| 36 | #define RADIUS_MIN 0.1 |
| 37 | #define RADIUS_MAX 5.0 |
| 38 | |
| 39 | #define STRENGTH_MIN -1.0 |
| 40 | #define STRENGTH_MAX 1.0 |
| 41 | |
| 42 | #define THRESHOLD_MIN -30 |
| 43 | #define THRESHOLD_MAX 30 |
| 44 | |
| 45 | typedef struct { |
| 46 | float radius; |
| 47 | float strength; |
| 48 | int threshold; |
| 49 | float quality; |
| 50 | struct SwsContext *filter_context; |
| 51 | } FilterParam; |
| 52 | |
| 53 | typedef struct { |
| 54 | const AVClass *class; |
| 55 | FilterParam luma; |
| 56 | FilterParam chroma; |
| 57 | int hsub; |
| 58 | int vsub; |
| 59 | unsigned int sws_flags; |
| 60 | } SmartblurContext; |
| 61 | |
| 62 | #define OFFSET(x) offsetof(SmartblurContext, x) |
| 63 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 64 | |
| 65 | static const AVOption smartblur_options[] = { |
| 66 | { "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
| 67 | { "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
| 68 | { "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
| 69 | { "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
| 70 | { "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
| 71 | { "lt", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
| 72 | |
| 73 | { "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
| 74 | { "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
| 75 | { "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
| 76 | { "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
| 77 | { "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
| 78 | { "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
| 79 | |
| 80 | { NULL } |
| 81 | }; |
| 82 | |
| 83 | AVFILTER_DEFINE_CLASS(smartblur); |
| 84 | |
| 85 | static av_cold int init(AVFilterContext *ctx) |
| 86 | { |
| 87 | SmartblurContext *sblur = ctx->priv; |
| 88 | |
| 89 | /* make chroma default to luma values, if not explicitly set */ |
| 90 | if (sblur->chroma.radius < RADIUS_MIN) |
| 91 | sblur->chroma.radius = sblur->luma.radius; |
| 92 | if (sblur->chroma.strength < STRENGTH_MIN) |
| 93 | sblur->chroma.strength = sblur->luma.strength; |
| 94 | if (sblur->chroma.threshold < THRESHOLD_MIN) |
| 95 | sblur->chroma.threshold = sblur->luma.threshold; |
| 96 | |
| 97 | sblur->luma.quality = sblur->chroma.quality = 3.0; |
| 98 | sblur->sws_flags = SWS_BICUBIC; |
| 99 | |
| 100 | av_log(ctx, AV_LOG_VERBOSE, |
| 101 | "luma_radius:%f luma_strength:%f luma_threshold:%d " |
| 102 | "chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n", |
| 103 | sblur->luma.radius, sblur->luma.strength, sblur->luma.threshold, |
| 104 | sblur->chroma.radius, sblur->chroma.strength, sblur->chroma.threshold); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static av_cold void uninit(AVFilterContext *ctx) |
| 110 | { |
| 111 | SmartblurContext *sblur = ctx->priv; |
| 112 | |
| 113 | sws_freeContext(sblur->luma.filter_context); |
| 114 | sws_freeContext(sblur->chroma.filter_context); |
| 115 | } |
| 116 | |
| 117 | static int query_formats(AVFilterContext *ctx) |
| 118 | { |
| 119 | static const enum AVPixelFormat pix_fmts[] = { |
| 120 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
| 121 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
| 122 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
| 123 | AV_PIX_FMT_GRAY8, |
| 124 | AV_PIX_FMT_NONE |
| 125 | }; |
| 126 | |
| 127 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags) |
| 133 | { |
| 134 | SwsVector *vec; |
| 135 | SwsFilter sws_filter; |
| 136 | |
| 137 | vec = sws_getGaussianVec(f->radius, f->quality); |
| 138 | |
| 139 | if (!vec) |
| 140 | return AVERROR(EINVAL); |
| 141 | |
| 142 | sws_scaleVec(vec, f->strength); |
| 143 | vec->coeff[vec->length / 2] += 1.0 - f->strength; |
| 144 | sws_filter.lumH = sws_filter.lumV = vec; |
| 145 | sws_filter.chrH = sws_filter.chrV = NULL; |
| 146 | f->filter_context = sws_getCachedContext(NULL, |
| 147 | width, height, AV_PIX_FMT_GRAY8, |
| 148 | width, height, AV_PIX_FMT_GRAY8, |
| 149 | flags, &sws_filter, NULL, NULL); |
| 150 | |
| 151 | sws_freeVec(vec); |
| 152 | |
| 153 | if (!f->filter_context) |
| 154 | return AVERROR(EINVAL); |
| 155 | |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | static int config_props(AVFilterLink *inlink) |
| 160 | { |
| 161 | SmartblurContext *sblur = inlink->dst->priv; |
| 162 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| 163 | |
| 164 | sblur->hsub = desc->log2_chroma_w; |
| 165 | sblur->vsub = desc->log2_chroma_h; |
| 166 | |
| 167 | alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->sws_flags); |
| 168 | alloc_sws_context(&sblur->chroma, |
| 169 | FF_CEIL_RSHIFT(inlink->w, sblur->hsub), |
| 170 | FF_CEIL_RSHIFT(inlink->h, sblur->vsub), |
| 171 | sblur->sws_flags); |
| 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | static void blur(uint8_t *dst, const int dst_linesize, |
| 177 | const uint8_t *src, const int src_linesize, |
| 178 | const int w, const int h, const int threshold, |
| 179 | struct SwsContext *filter_context) |
| 180 | { |
| 181 | int x, y; |
| 182 | int orig, filtered; |
| 183 | int diff; |
| 184 | /* Declare arrays of 4 to get aligned data */ |
| 185 | const uint8_t* const src_array[4] = {src}; |
| 186 | uint8_t *dst_array[4] = {dst}; |
| 187 | int src_linesize_array[4] = {src_linesize}; |
| 188 | int dst_linesize_array[4] = {dst_linesize}; |
| 189 | |
| 190 | sws_scale(filter_context, src_array, src_linesize_array, |
| 191 | 0, h, dst_array, dst_linesize_array); |
| 192 | |
| 193 | if (threshold > 0) { |
| 194 | for (y = 0; y < h; ++y) { |
| 195 | for (x = 0; x < w; ++x) { |
| 196 | orig = src[x + y * src_linesize]; |
| 197 | filtered = dst[x + y * dst_linesize]; |
| 198 | diff = orig - filtered; |
| 199 | |
| 200 | if (diff > 0) { |
| 201 | if (diff > 2 * threshold) |
| 202 | dst[x + y * dst_linesize] = orig; |
| 203 | else if (diff > threshold) |
| 204 | /* add 'diff' and subtract 'threshold' from 'filtered' */ |
| 205 | dst[x + y * dst_linesize] = orig - threshold; |
| 206 | } else { |
| 207 | if (-diff > 2 * threshold) |
| 208 | dst[x + y * dst_linesize] = orig; |
| 209 | else if (-diff > threshold) |
| 210 | /* add 'diff' and 'threshold' to 'filtered' */ |
| 211 | dst[x + y * dst_linesize] = orig + threshold; |
| 212 | } |
| 213 | } |
| 214 | } |
| 215 | } else if (threshold < 0) { |
| 216 | for (y = 0; y < h; ++y) { |
| 217 | for (x = 0; x < w; ++x) { |
| 218 | orig = src[x + y * src_linesize]; |
| 219 | filtered = dst[x + y * dst_linesize]; |
| 220 | diff = orig - filtered; |
| 221 | |
| 222 | if (diff > 0) { |
| 223 | if (diff <= -threshold) |
| 224 | dst[x + y * dst_linesize] = orig; |
| 225 | else if (diff <= -2 * threshold) |
| 226 | /* subtract 'diff' and 'threshold' from 'orig' */ |
| 227 | dst[x + y * dst_linesize] = filtered - threshold; |
| 228 | } else { |
| 229 | if (diff >= threshold) |
| 230 | dst[x + y * dst_linesize] = orig; |
| 231 | else if (diff >= 2 * threshold) |
| 232 | /* add 'threshold' and subtract 'diff' from 'orig' */ |
| 233 | dst[x + y * dst_linesize] = filtered + threshold; |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) |
| 241 | { |
| 242 | SmartblurContext *sblur = inlink->dst->priv; |
| 243 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
| 244 | AVFrame *outpic; |
| 245 | int cw = FF_CEIL_RSHIFT(inlink->w, sblur->hsub); |
| 246 | int ch = FF_CEIL_RSHIFT(inlink->h, sblur->vsub); |
| 247 | |
| 248 | outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 249 | if (!outpic) { |
| 250 | av_frame_free(&inpic); |
| 251 | return AVERROR(ENOMEM); |
| 252 | } |
| 253 | av_frame_copy_props(outpic, inpic); |
| 254 | |
| 255 | blur(outpic->data[0], outpic->linesize[0], |
| 256 | inpic->data[0], inpic->linesize[0], |
| 257 | inlink->w, inlink->h, sblur->luma.threshold, |
| 258 | sblur->luma.filter_context); |
| 259 | |
| 260 | if (inpic->data[2]) { |
| 261 | blur(outpic->data[1], outpic->linesize[1], |
| 262 | inpic->data[1], inpic->linesize[1], |
| 263 | cw, ch, sblur->chroma.threshold, |
| 264 | sblur->chroma.filter_context); |
| 265 | blur(outpic->data[2], outpic->linesize[2], |
| 266 | inpic->data[2], inpic->linesize[2], |
| 267 | cw, ch, sblur->chroma.threshold, |
| 268 | sblur->chroma.filter_context); |
| 269 | } |
| 270 | |
| 271 | av_frame_free(&inpic); |
| 272 | return ff_filter_frame(outlink, outpic); |
| 273 | } |
| 274 | |
| 275 | static const AVFilterPad smartblur_inputs[] = { |
| 276 | { |
| 277 | .name = "default", |
| 278 | .type = AVMEDIA_TYPE_VIDEO, |
| 279 | .filter_frame = filter_frame, |
| 280 | .config_props = config_props, |
| 281 | }, |
| 282 | { NULL } |
| 283 | }; |
| 284 | |
| 285 | static const AVFilterPad smartblur_outputs[] = { |
| 286 | { |
| 287 | .name = "default", |
| 288 | .type = AVMEDIA_TYPE_VIDEO, |
| 289 | }, |
| 290 | { NULL } |
| 291 | }; |
| 292 | |
| 293 | AVFilter ff_vf_smartblur = { |
| 294 | .name = "smartblur", |
| 295 | .description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."), |
| 296 | .priv_size = sizeof(SmartblurContext), |
| 297 | .init = init, |
| 298 | .uninit = uninit, |
| 299 | .query_formats = query_formats, |
| 300 | .inputs = smartblur_inputs, |
| 301 | .outputs = smartblur_outputs, |
| 302 | .priv_class = &smartblur_class, |
| 303 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| 304 | }; |