| 1 | /* |
| 2 | * Copyright (c) 2013 Clément Bœsch |
| 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 <float.h> /* DBL_MAX */ |
| 22 | |
| 23 | #include "libavutil/opt.h" |
| 24 | #include "libavutil/eval.h" |
| 25 | #include "libavutil/avassert.h" |
| 26 | #include "libavutil/pixdesc.h" |
| 27 | #include "avfilter.h" |
| 28 | #include "formats.h" |
| 29 | #include "internal.h" |
| 30 | #include "video.h" |
| 31 | |
| 32 | static const char *const var_names[] = { |
| 33 | "w", // stream width |
| 34 | "h", // stream height |
| 35 | "n", // frame count |
| 36 | "pts", // presentation timestamp expressed in AV_TIME_BASE units |
| 37 | "r", // frame rate |
| 38 | "t", // timestamp expressed in seconds |
| 39 | "tb", // timebase |
| 40 | NULL |
| 41 | }; |
| 42 | |
| 43 | enum var_name { |
| 44 | VAR_W, |
| 45 | VAR_H, |
| 46 | VAR_N, |
| 47 | VAR_PTS, |
| 48 | VAR_R, |
| 49 | VAR_T, |
| 50 | VAR_TB, |
| 51 | VAR_NB |
| 52 | }; |
| 53 | |
| 54 | typedef struct { |
| 55 | const AVClass *class; |
| 56 | const AVPixFmtDescriptor *desc; |
| 57 | int backward; |
| 58 | enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode; |
| 59 | #define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name |
| 60 | DEF_EXPR_FIELDS(angle); |
| 61 | DEF_EXPR_FIELDS(x0); |
| 62 | DEF_EXPR_FIELDS(y0); |
| 63 | double var_values[VAR_NB]; |
| 64 | float *fmap; |
| 65 | int fmap_linesize; |
| 66 | double dmax; |
| 67 | float xscale, yscale; |
| 68 | uint32_t dither; |
| 69 | int do_dither; |
| 70 | AVRational aspect; |
| 71 | AVRational scale; |
| 72 | } VignetteContext; |
| 73 | |
| 74 | #define OFFSET(x) offsetof(VignetteContext, x) |
| 75 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 76 | static const AVOption vignette_options[] = { |
| 77 | { "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS }, |
| 78 | { "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS }, |
| 79 | { "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS }, |
| 80 | { "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS }, |
| 81 | { "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, "mode" }, |
| 82 | { "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, "mode"}, |
| 83 | { "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, "mode"}, |
| 84 | { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" }, |
| 85 | { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" }, |
| 86 | { "frame", "eval expressions for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" }, |
| 87 | { "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, FLAGS }, |
| 88 | { "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS }, |
| 89 | { NULL } |
| 90 | }; |
| 91 | |
| 92 | AVFILTER_DEFINE_CLASS(vignette); |
| 93 | |
| 94 | static av_cold int init(AVFilterContext *ctx) |
| 95 | { |
| 96 | VignetteContext *s = ctx->priv; |
| 97 | |
| 98 | #define PARSE_EXPR(name) do { \ |
| 99 | int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \ |
| 100 | NULL, NULL, NULL, NULL, 0, ctx); \ |
| 101 | if (ret < 0) { \ |
| 102 | av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \ |
| 103 | AV_STRINGIFY(name) "'\n"); \ |
| 104 | return ret; \ |
| 105 | } \ |
| 106 | } while (0) |
| 107 | |
| 108 | PARSE_EXPR(angle); |
| 109 | PARSE_EXPR(x0); |
| 110 | PARSE_EXPR(y0); |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static av_cold void uninit(AVFilterContext *ctx) |
| 115 | { |
| 116 | VignetteContext *s = ctx->priv; |
| 117 | av_freep(&s->fmap); |
| 118 | av_expr_free(s->angle_pexpr); |
| 119 | av_expr_free(s->x0_pexpr); |
| 120 | av_expr_free(s->y0_pexpr); |
| 121 | } |
| 122 | |
| 123 | static int query_formats(AVFilterContext *ctx) |
| 124 | { |
| 125 | static const enum AVPixelFormat pix_fmts[] = { |
| 126 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
| 127 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
| 128 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
| 129 | AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, |
| 130 | AV_PIX_FMT_GRAY8, |
| 131 | AV_PIX_FMT_NONE |
| 132 | }; |
| 133 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static double get_natural_factor(const VignetteContext *s, int x, int y) |
| 138 | { |
| 139 | const int xx = (x - s->x0) * s->xscale; |
| 140 | const int yy = (y - s->y0) * s->yscale; |
| 141 | const double dnorm = hypot(xx, yy) / s->dmax; |
| 142 | if (dnorm > 1) { |
| 143 | return 0; |
| 144 | } else { |
| 145 | const double c = cos(s->angle * dnorm); |
| 146 | return (c*c)*(c*c); // do not remove braces, it helps compilers |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) |
| 151 | #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb)) |
| 152 | |
| 153 | static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame) |
| 154 | { |
| 155 | int x, y; |
| 156 | float *dst = s->fmap; |
| 157 | int dst_linesize = s->fmap_linesize; |
| 158 | |
| 159 | if (frame) { |
| 160 | s->var_values[VAR_N] = inlink->frame_count; |
| 161 | s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base); |
| 162 | s->var_values[VAR_PTS] = TS2D(frame->pts); |
| 163 | } else { |
| 164 | s->var_values[VAR_N] = 0; |
| 165 | s->var_values[VAR_T] = NAN; |
| 166 | s->var_values[VAR_PTS] = NAN; |
| 167 | } |
| 168 | |
| 169 | s->angle = av_clipf(av_expr_eval(s->angle_pexpr, s->var_values, NULL), 0, M_PI_2); |
| 170 | s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL); |
| 171 | s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL); |
| 172 | |
| 173 | if (s->backward) { |
| 174 | for (y = 0; y < inlink->h; y++) { |
| 175 | for (x = 0; x < inlink->w; x++) |
| 176 | dst[x] = 1. / get_natural_factor(s, x, y); |
| 177 | dst += dst_linesize; |
| 178 | } |
| 179 | } else { |
| 180 | for (y = 0; y < inlink->h; y++) { |
| 181 | for (x = 0; x < inlink->w; x++) |
| 182 | dst[x] = get_natural_factor(s, x, y); |
| 183 | dst += dst_linesize; |
| 184 | } |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | static inline double get_dither_value(VignetteContext *s) |
| 189 | { |
| 190 | double dv = 0; |
| 191 | if (s->do_dither) { |
| 192 | dv = s->dither / (double)(1LL<<32); |
| 193 | s->dither = s->dither * 1664525 + 1013904223; |
| 194 | } |
| 195 | return dv; |
| 196 | } |
| 197 | |
| 198 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| 199 | { |
| 200 | unsigned x, y, direct = 0; |
| 201 | AVFilterContext *ctx = inlink->dst; |
| 202 | VignetteContext *s = ctx->priv; |
| 203 | AVFilterLink *outlink = ctx->outputs[0]; |
| 204 | AVFrame *out; |
| 205 | |
| 206 | if (av_frame_is_writable(in)) { |
| 207 | direct = 1; |
| 208 | out = in; |
| 209 | } else { |
| 210 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 211 | if (!out) { |
| 212 | av_frame_free(&in); |
| 213 | return AVERROR(ENOMEM); |
| 214 | } |
| 215 | av_frame_copy_props(out, in); |
| 216 | } |
| 217 | |
| 218 | if (s->eval_mode == EVAL_MODE_FRAME) |
| 219 | update_context(s, inlink, in); |
| 220 | |
| 221 | if (s->desc->flags & AV_PIX_FMT_FLAG_RGB) { |
| 222 | uint8_t *dst = out->data[0]; |
| 223 | const uint8_t *src = in ->data[0]; |
| 224 | const float *fmap = s->fmap; |
| 225 | const int dst_linesize = out->linesize[0]; |
| 226 | const int src_linesize = in ->linesize[0]; |
| 227 | const int fmap_linesize = s->fmap_linesize; |
| 228 | |
| 229 | for (y = 0; y < inlink->h; y++) { |
| 230 | uint8_t *dstp = dst; |
| 231 | const uint8_t *srcp = src; |
| 232 | |
| 233 | for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) { |
| 234 | const float f = fmap[x]; |
| 235 | |
| 236 | dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s)); |
| 237 | dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s)); |
| 238 | dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s)); |
| 239 | } |
| 240 | dst += dst_linesize; |
| 241 | src += src_linesize; |
| 242 | fmap += fmap_linesize; |
| 243 | } |
| 244 | } else { |
| 245 | int plane; |
| 246 | |
| 247 | for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) { |
| 248 | uint8_t *dst = out->data[plane]; |
| 249 | const uint8_t *src = in ->data[plane]; |
| 250 | const float *fmap = s->fmap; |
| 251 | const int dst_linesize = out->linesize[plane]; |
| 252 | const int src_linesize = in ->linesize[plane]; |
| 253 | const int fmap_linesize = s->fmap_linesize; |
| 254 | const int chroma = plane == 1 || plane == 2; |
| 255 | const int hsub = chroma ? s->desc->log2_chroma_w : 0; |
| 256 | const int vsub = chroma ? s->desc->log2_chroma_h : 0; |
| 257 | const int w = FF_CEIL_RSHIFT(inlink->w, hsub); |
| 258 | const int h = FF_CEIL_RSHIFT(inlink->h, vsub); |
| 259 | |
| 260 | for (y = 0; y < h; y++) { |
| 261 | uint8_t *dstp = dst; |
| 262 | const uint8_t *srcp = src; |
| 263 | |
| 264 | for (x = 0; x < w; x++) { |
| 265 | const double dv = get_dither_value(s); |
| 266 | if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv); |
| 267 | else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv); |
| 268 | } |
| 269 | dst += dst_linesize; |
| 270 | src += src_linesize; |
| 271 | fmap += fmap_linesize << vsub; |
| 272 | } |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | if (!direct) |
| 277 | av_frame_free(&in); |
| 278 | return ff_filter_frame(outlink, out); |
| 279 | } |
| 280 | |
| 281 | static int config_props(AVFilterLink *inlink) |
| 282 | { |
| 283 | VignetteContext *s = inlink->dst->priv; |
| 284 | AVRational sar = inlink->sample_aspect_ratio; |
| 285 | |
| 286 | s->desc = av_pix_fmt_desc_get(inlink->format); |
| 287 | s->var_values[VAR_W] = inlink->w; |
| 288 | s->var_values[VAR_H] = inlink->h; |
| 289 | s->var_values[VAR_TB] = av_q2d(inlink->time_base); |
| 290 | s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ? |
| 291 | NAN : av_q2d(inlink->frame_rate); |
| 292 | |
| 293 | if (!sar.num || !sar.den) |
| 294 | sar.num = sar.den = 1; |
| 295 | if (sar.num > sar.den) { |
| 296 | s->xscale = av_q2d(av_div_q(sar, s->aspect)); |
| 297 | s->yscale = 1; |
| 298 | } else { |
| 299 | s->yscale = av_q2d(av_div_q(s->aspect, sar)); |
| 300 | s->xscale = 1; |
| 301 | } |
| 302 | s->dmax = hypot(inlink->w / 2., inlink->h / 2.); |
| 303 | av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n", |
| 304 | s->xscale, s->yscale, s->dmax); |
| 305 | |
| 306 | s->fmap_linesize = FFALIGN(inlink->w, 32); |
| 307 | s->fmap = av_malloc_array(s->fmap_linesize, inlink->h * sizeof(*s->fmap)); |
| 308 | if (!s->fmap) |
| 309 | return AVERROR(ENOMEM); |
| 310 | |
| 311 | if (s->eval_mode == EVAL_MODE_INIT) |
| 312 | update_context(s, inlink, NULL); |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static const AVFilterPad vignette_inputs[] = { |
| 318 | { |
| 319 | .name = "default", |
| 320 | .type = AVMEDIA_TYPE_VIDEO, |
| 321 | .filter_frame = filter_frame, |
| 322 | .config_props = config_props, |
| 323 | }, |
| 324 | { NULL } |
| 325 | }; |
| 326 | |
| 327 | static const AVFilterPad vignette_outputs[] = { |
| 328 | { |
| 329 | .name = "default", |
| 330 | .type = AVMEDIA_TYPE_VIDEO, |
| 331 | }, |
| 332 | { NULL } |
| 333 | }; |
| 334 | |
| 335 | AVFilter ff_vf_vignette = { |
| 336 | .name = "vignette", |
| 337 | .description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."), |
| 338 | .priv_size = sizeof(VignetteContext), |
| 339 | .init = init, |
| 340 | .uninit = uninit, |
| 341 | .query_formats = query_formats, |
| 342 | .inputs = vignette_inputs, |
| 343 | .outputs = vignette_outputs, |
| 344 | .priv_class = &vignette_class, |
| 345 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| 346 | }; |