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path: root/libavfilter/vf_vignette.c (plain)
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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
32static 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
43enum 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
54enum EvalMode {
55 EVAL_MODE_INIT,
56 EVAL_MODE_FRAME,
57 EVAL_MODE_NB
58};
59
60typedef struct {
61 const AVClass *class;
62 const AVPixFmtDescriptor *desc;
63 int backward;
64 int eval_mode; ///< EvalMode
65#define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name
66 DEF_EXPR_FIELDS(angle);
67 DEF_EXPR_FIELDS(x0);
68 DEF_EXPR_FIELDS(y0);
69 double var_values[VAR_NB];
70 float *fmap;
71 int fmap_linesize;
72 double dmax;
73 float xscale, yscale;
74 uint32_t dither;
75 int do_dither;
76 AVRational aspect;
77 AVRational scale;
78} VignetteContext;
79
80#define OFFSET(x) offsetof(VignetteContext, x)
81#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
82static const AVOption vignette_options[] = {
83 { "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
84 { "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
85 { "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS },
86 { "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS },
87 { "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, "mode" },
88 { "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, "mode"},
89 { "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, "mode"},
90 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
91 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
92 { "frame", "eval expressions for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
93 { "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
94 { "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS },
95 { NULL }
96};
97
98AVFILTER_DEFINE_CLASS(vignette);
99
100static av_cold int init(AVFilterContext *ctx)
101{
102 VignetteContext *s = ctx->priv;
103
104#define PARSE_EXPR(name) do { \
105 int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \
106 NULL, NULL, NULL, NULL, 0, ctx); \
107 if (ret < 0) { \
108 av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \
109 AV_STRINGIFY(name) "'\n"); \
110 return ret; \
111 } \
112} while (0)
113
114 PARSE_EXPR(angle);
115 PARSE_EXPR(x0);
116 PARSE_EXPR(y0);
117 return 0;
118}
119
120static av_cold void uninit(AVFilterContext *ctx)
121{
122 VignetteContext *s = ctx->priv;
123 av_freep(&s->fmap);
124 av_expr_free(s->angle_pexpr);
125 av_expr_free(s->x0_pexpr);
126 av_expr_free(s->y0_pexpr);
127}
128
129static int query_formats(AVFilterContext *ctx)
130{
131 static const enum AVPixelFormat pix_fmts[] = {
132 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
133 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
134 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
135 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
136 AV_PIX_FMT_GRAY8,
137 AV_PIX_FMT_NONE
138 };
139 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
140 if (!fmts_list)
141 return AVERROR(ENOMEM);
142 return ff_set_common_formats(ctx, fmts_list);
143}
144
145static double get_natural_factor(const VignetteContext *s, int x, int y)
146{
147 const int xx = (x - s->x0) * s->xscale;
148 const int yy = (y - s->y0) * s->yscale;
149 const double dnorm = hypot(xx, yy) / s->dmax;
150 if (dnorm > 1) {
151 return 0;
152 } else {
153 const double c = cos(s->angle * dnorm);
154 return (c*c)*(c*c); // do not remove braces, it helps compilers
155 }
156}
157
158#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
159#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb))
160
161static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame)
162{
163 int x, y;
164 float *dst = s->fmap;
165 int dst_linesize = s->fmap_linesize;
166
167 if (frame) {
168 s->var_values[VAR_N] = inlink->frame_count_out;
169 s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base);
170 s->var_values[VAR_PTS] = TS2D(frame->pts);
171 } else {
172 s->var_values[VAR_N] = NAN;
173 s->var_values[VAR_T] = NAN;
174 s->var_values[VAR_PTS] = NAN;
175 }
176
177 s->angle = av_expr_eval(s->angle_pexpr, s->var_values, NULL);
178 s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL);
179 s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL);
180
181 if (isnan(s->x0) || isnan(s->y0) || isnan(s->angle))
182 s->eval_mode = EVAL_MODE_FRAME;
183
184 s->angle = av_clipf(s->angle, 0, M_PI_2);
185
186 if (s->backward) {
187 for (y = 0; y < inlink->h; y++) {
188 for (x = 0; x < inlink->w; x++)
189 dst[x] = 1. / get_natural_factor(s, x, y);
190 dst += dst_linesize;
191 }
192 } else {
193 for (y = 0; y < inlink->h; y++) {
194 for (x = 0; x < inlink->w; x++)
195 dst[x] = get_natural_factor(s, x, y);
196 dst += dst_linesize;
197 }
198 }
199}
200
201static inline double get_dither_value(VignetteContext *s)
202{
203 double dv = 0;
204 if (s->do_dither) {
205 dv = s->dither / (double)(1LL<<32);
206 s->dither = s->dither * 1664525 + 1013904223;
207 }
208 return dv;
209}
210
211static int filter_frame(AVFilterLink *inlink, AVFrame *in)
212{
213 unsigned x, y, direct = 0;
214 AVFilterContext *ctx = inlink->dst;
215 VignetteContext *s = ctx->priv;
216 AVFilterLink *outlink = ctx->outputs[0];
217 AVFrame *out;
218
219 if (av_frame_is_writable(in)) {
220 direct = 1;
221 out = in;
222 } else {
223 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
224 if (!out) {
225 av_frame_free(&in);
226 return AVERROR(ENOMEM);
227 }
228 av_frame_copy_props(out, in);
229 }
230
231 if (s->eval_mode == EVAL_MODE_FRAME)
232 update_context(s, inlink, in);
233
234 if (s->desc->flags & AV_PIX_FMT_FLAG_RGB) {
235 uint8_t *dst = out->data[0];
236 const uint8_t *src = in ->data[0];
237 const float *fmap = s->fmap;
238 const int dst_linesize = out->linesize[0];
239 const int src_linesize = in ->linesize[0];
240 const int fmap_linesize = s->fmap_linesize;
241
242 for (y = 0; y < inlink->h; y++) {
243 uint8_t *dstp = dst;
244 const uint8_t *srcp = src;
245
246 for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) {
247 const float f = fmap[x];
248
249 dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s));
250 dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s));
251 dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s));
252 }
253 dst += dst_linesize;
254 src += src_linesize;
255 fmap += fmap_linesize;
256 }
257 } else {
258 int plane;
259
260 for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
261 uint8_t *dst = out->data[plane];
262 const uint8_t *src = in ->data[plane];
263 const float *fmap = s->fmap;
264 const int dst_linesize = out->linesize[plane];
265 const int src_linesize = in ->linesize[plane];
266 const int fmap_linesize = s->fmap_linesize;
267 const int chroma = plane == 1 || plane == 2;
268 const int hsub = chroma ? s->desc->log2_chroma_w : 0;
269 const int vsub = chroma ? s->desc->log2_chroma_h : 0;
270 const int w = AV_CEIL_RSHIFT(inlink->w, hsub);
271 const int h = AV_CEIL_RSHIFT(inlink->h, vsub);
272
273 for (y = 0; y < h; y++) {
274 uint8_t *dstp = dst;
275 const uint8_t *srcp = src;
276
277 for (x = 0; x < w; x++) {
278 const double dv = get_dither_value(s);
279 if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv);
280 else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv);
281 }
282 dst += dst_linesize;
283 src += src_linesize;
284 fmap += fmap_linesize << vsub;
285 }
286 }
287 }
288
289 if (!direct)
290 av_frame_free(&in);
291 return ff_filter_frame(outlink, out);
292}
293
294static int config_props(AVFilterLink *inlink)
295{
296 VignetteContext *s = inlink->dst->priv;
297 AVRational sar = inlink->sample_aspect_ratio;
298
299 s->desc = av_pix_fmt_desc_get(inlink->format);
300 s->var_values[VAR_W] = inlink->w;
301 s->var_values[VAR_H] = inlink->h;
302 s->var_values[VAR_TB] = av_q2d(inlink->time_base);
303 s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
304 NAN : av_q2d(inlink->frame_rate);
305
306 if (!sar.num || !sar.den)
307 sar.num = sar.den = 1;
308 if (sar.num > sar.den) {
309 s->xscale = av_q2d(av_div_q(sar, s->aspect));
310 s->yscale = 1;
311 } else {
312 s->yscale = av_q2d(av_div_q(s->aspect, sar));
313 s->xscale = 1;
314 }
315 s->dmax = hypot(inlink->w / 2., inlink->h / 2.);
316 av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n",
317 s->xscale, s->yscale, s->dmax);
318
319 s->fmap_linesize = FFALIGN(inlink->w, 32);
320 s->fmap = av_malloc_array(s->fmap_linesize, inlink->h * sizeof(*s->fmap));
321 if (!s->fmap)
322 return AVERROR(ENOMEM);
323
324 if (s->eval_mode == EVAL_MODE_INIT)
325 update_context(s, inlink, NULL);
326
327 return 0;
328}
329
330static const AVFilterPad vignette_inputs[] = {
331 {
332 .name = "default",
333 .type = AVMEDIA_TYPE_VIDEO,
334 .filter_frame = filter_frame,
335 .config_props = config_props,
336 },
337 { NULL }
338};
339
340static const AVFilterPad vignette_outputs[] = {
341 {
342 .name = "default",
343 .type = AVMEDIA_TYPE_VIDEO,
344 },
345 { NULL }
346};
347
348AVFilter ff_vf_vignette = {
349 .name = "vignette",
350 .description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."),
351 .priv_size = sizeof(VignetteContext),
352 .init = init,
353 .uninit = uninit,
354 .query_formats = query_formats,
355 .inputs = vignette_inputs,
356 .outputs = vignette_outputs,
357 .priv_class = &vignette_class,
358 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
359};
360
generated by cgit at 2024-05-17 03:28:49 (GMT)