FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_hue.c
Date: 2026-05-01 13:04:54
Exec Total Coverage
Lines: 149 201 74.1%
Functions: 11 13 84.6%
Branches: 71 126 56.3%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2003 Michael Niedermayer
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
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (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 GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Apply a hue/saturation filter to the input video
25 * Ported from MPlayer libmpcodecs/vf_hue.c.
26 */
27
28 #include <float.h>
29 #include "libavutil/eval.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34
35 #include "avfilter.h"
36 #include "filters.h"
37 #include "video.h"
38
39 #define SAT_MIN_VAL -10
40 #define SAT_MAX_VAL 10
41
42 static const char *const var_names[] = {
43 "n", // frame count
44 "pts", // presentation timestamp expressed in AV_TIME_BASE units
45 "r", // frame rate
46 "t", // timestamp expressed in seconds
47 "tb", // timebase
48 NULL
49 };
50
51 enum var_name {
52 VAR_N,
53 VAR_PTS,
54 VAR_R,
55 VAR_T,
56 VAR_TB,
57 VAR_NB
58 };
59
60 typedef struct HueContext {
61 const AVClass *class;
62 float hue_deg; /* hue expressed in degrees */
63 float hue; /* hue expressed in radians */
64 char *hue_deg_expr;
65 char *hue_expr;
66 AVExpr *hue_deg_pexpr;
67 AVExpr *hue_pexpr;
68 float saturation;
69 char *saturation_expr;
70 AVExpr *saturation_pexpr;
71 float brightness;
72 char *brightness_expr;
73 AVExpr *brightness_pexpr;
74 int hsub;
75 int vsub;
76 int is_first;
77 int32_t hue_sin;
78 int32_t hue_cos;
79 double var_values[VAR_NB];
80 uint8_t lut_l[256];
81 uint8_t lut_u[256][256];
82 uint8_t lut_v[256][256];
83 uint16_t lut_l16[65536];
84 uint16_t lut_u10[1024][1024];
85 uint16_t lut_v10[1024][1024];
86 } HueContext;
87
88 #define OFFSET(x) offsetof(HueContext, x)
89 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
90 static const AVOption hue_options[] = {
91 { "h", "set the hue angle degrees expression", OFFSET(hue_deg_expr), AV_OPT_TYPE_STRING,
92 { .str = NULL }, .flags = FLAGS },
93 { "s", "set the saturation expression", OFFSET(saturation_expr), AV_OPT_TYPE_STRING,
94 { .str = "1" }, .flags = FLAGS },
95 { "H", "set the hue angle radians expression", OFFSET(hue_expr), AV_OPT_TYPE_STRING,
96 { .str = NULL }, .flags = FLAGS },
97 { "b", "set the brightness expression", OFFSET(brightness_expr), AV_OPT_TYPE_STRING,
98 { .str = "0" }, .flags = FLAGS },
99 { NULL }
100 };
101
102 AVFILTER_DEFINE_CLASS(hue);
103
104 92 static inline void compute_sin_and_cos(HueContext *hue)
105 {
106 /*
107 * Scale the value to the norm of the resulting (U,V) vector, that is
108 * the saturation.
109 * This will be useful in the apply_lut function.
110 */
111 92 hue->hue_sin = lrint(sin(hue->hue) * (1 << 16) * hue->saturation);
112 92 hue->hue_cos = lrint(cos(hue->hue) * (1 << 16) * hue->saturation);
113 92 }
114
115 23 static inline void create_luma_lut(HueContext *h)
116 {
117 23 const float b = h->brightness;
118 int i;
119
120
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 5911 for (i = 0; i < 256; i++) {
121 5888 h->lut_l[i] = av_clip_uint8(i + b * 25.5);
122 }
123
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 1507351 for (i = 0; i < 65536; i++) {
124 1507328 h->lut_l16[i] = av_clip_uintp2(i + b * 102.4, 10);
125 }
126 23 }
127
128 64 static inline void create_chrominance_lut(HueContext *h, const int32_t c,
129 const int32_t s)
130 {
131 int32_t i, j, u, v, new_u, new_v;
132
133 /*
134 * If we consider U and V as the components of a 2D vector then its angle
135 * is the hue and the norm is the saturation
136 */
137
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138
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 4210688 for (j = 0; j < 256; j++) {
139 /* Normalize the components from range [16;240] to [-112;112] */
140 4194304 u = i - 128;
141 4194304 v = j - 128;
142 /*
143 * Apply the rotation of the vector : (c * u) - (s * v)
144 * (s * u) + (c * v)
145 * De-normalize the components (without forgetting to scale 128
146 * by << 16)
147 * Finally scale back the result by >> 16
148 */
149 4194304 new_u = ((c * u) - (s * v) + (1 << 15) + (128 << 16)) >> 16;
150 4194304 new_v = ((s * u) + (c * v) + (1 << 15) + (128 << 16)) >> 16;
151
152 /* Prevent a potential overflow */
153 4194304 h->lut_u[i][j] = av_clip_uint8(new_u);
154 4194304 h->lut_v[i][j] = av_clip_uint8(new_v);
155 }
156 }
157
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158
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159 67108864 u = i - 512;
160 67108864 v = j - 512;
161 /*
162 * Apply the rotation of the vector : (c * u) - (s * v)
163 * (s * u) + (c * v)
164 * De-normalize the components (without forgetting to scale 512
165 * by << 16)
166 * Finally scale back the result by >> 16
167 */
168 67108864 new_u = ((c * u) - (s * v) + (1 << 15) + (512 << 16)) >> 16;
169 67108864 new_v = ((s * u) + (c * v) + (1 << 15) + (512 << 16)) >> 16;
170
171 /* Prevent a potential overflow */
172 67108864 h->lut_u10[i][j] = av_clip_uintp2(new_u, 10);
173 67108864 h->lut_v10[i][j] = av_clip_uintp2(new_v, 10);
174 }
175 }
176 64 }
177
178 20 static int set_expr(AVExpr **pexpr_ptr, char **expr_ptr,
179 const char *expr, const char *option, void *log_ctx)
180 {
181 int ret;
182 AVExpr *new_pexpr;
183 char *new_expr;
184
185 20 new_expr = av_strdup(expr);
186
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 20 if (!new_expr)
187 ✗ return AVERROR(ENOMEM);
188 20 ret = av_expr_parse(&new_pexpr, expr, var_names,
189 NULL, NULL, NULL, NULL, 0, log_ctx);
190
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 20 if (ret < 0) {
191 ✗ av_log(log_ctx, AV_LOG_ERROR,
192 "Error when evaluating the expression '%s' for %s\n",
193 expr, option);
194 ✗ av_free(new_expr);
195 ✗ return ret;
196 }
197
198
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 20 if (*pexpr_ptr)
199 ✗ av_expr_free(*pexpr_ptr);
200 20 *pexpr_ptr = new_pexpr;
201 20 av_freep(expr_ptr);
202 20 *expr_ptr = new_expr;
203
204 20 return 0;
205 }
206
207 8 static av_cold int init(AVFilterContext *ctx)
208 {
209 8 HueContext *hue = ctx->priv;
210 int ret;
211
212
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 8 if (hue->hue_expr && hue->hue_deg_expr) {
213 ✗ av_log(ctx, AV_LOG_ERROR,
214 "H and h options are incompatible and cannot be specified "
215 "at the same time\n");
216 ✗ return AVERROR(EINVAL);
217 }
218
219 #define SET_EXPR(expr, option) \
220 if (hue->expr##_expr) do { \
221 ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
222 hue->expr##_expr, option, ctx); \
223 if (ret < 0) \
224 return ret; \
225 } while (0)
226
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 8 SET_EXPR(brightness, "b");
227
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 8 SET_EXPR(saturation, "s");
228
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 8 SET_EXPR(hue_deg, "h");
229
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 8 SET_EXPR(hue, "H");
230 #undef SET_EXPR
231
232 8 av_log(ctx, AV_LOG_VERBOSE,
233 "H_expr:%s h_deg_expr:%s s_expr:%s b_expr:%s\n",
234 hue->hue_expr, hue->hue_deg_expr, hue->saturation_expr, hue->brightness_expr);
235 8 compute_sin_and_cos(hue);
236 8 hue->is_first = 1;
237
238 8 return 0;
239 }
240
241 8 static av_cold void uninit(AVFilterContext *ctx)
242 {
243 8 HueContext *hue = ctx->priv;
244
245 8 av_expr_free(hue->brightness_pexpr);
246 8 av_expr_free(hue->hue_deg_pexpr);
247 8 av_expr_free(hue->hue_pexpr);
248 8 av_expr_free(hue->saturation_pexpr);
249 8 }
250
251 static const enum AVPixelFormat pix_fmts[] = {
252 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
253 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
254 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
255 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
256 AV_PIX_FMT_YUVA420P,
257 AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10,
258 AV_PIX_FMT_YUV420P10,
259 AV_PIX_FMT_YUV440P10,
260 AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10,
261 AV_PIX_FMT_YUVA420P10,
262 AV_PIX_FMT_NONE
263 };
264
265 4 static int config_props(AVFilterLink *inlink)
266 {
267 4 HueContext *hue = inlink->dst->priv;
268 4 FilterLink *l = ff_filter_link(inlink);
269 4 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
270
271 4 hue->hsub = desc->log2_chroma_w;
272 4 hue->vsub = desc->log2_chroma_h;
273
274 4 hue->var_values[VAR_N] = 0;
275 4 hue->var_values[VAR_TB] = av_q2d(inlink->time_base);
276
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 4 hue->var_values[VAR_R] = l->frame_rate.num == 0 || l->frame_rate.den == 0 ?
277
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 8 NAN : av_q2d(l->frame_rate);
278
279 4 return 0;
280 }
281
282 20 static void apply_luma_lut(HueContext *s,
283 uint8_t *ldst, const int dst_linesize,
284 uint8_t *lsrc, const int src_linesize,
285 int w, int h)
286 {
287 int i;
288
289
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 5780 while (h--) {
290
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 2033280 for (i = 0; i < w; i++)
291 2027520 ldst[i] = s->lut_l[lsrc[i]];
292
293 5760 lsrc += src_linesize;
294 5760 ldst += dst_linesize;
295 }
296 20 }
297
298 ✗ static void apply_luma_lut10(HueContext *s,
299 uint16_t *ldst, const int dst_linesize,
300 uint16_t *lsrc, const int src_linesize,
301 int w, int h)
302 {
303 int i;
304
305 ✗ while (h--) {
306 ✗ for (i = 0; i < w; i++)
307 ✗ ldst[i] = s->lut_l16[lsrc[i]];
308
309 ✗ lsrc += src_linesize;
310 ✗ ldst += dst_linesize;
311 }
312 ✗ }
313
314 63 static void apply_lut(HueContext *s,
315 uint8_t *udst, uint8_t *vdst, const int dst_linesize,
316 uint8_t *usrc, uint8_t *vsrc, const int src_linesize,
317 int w, int h)
318 {
319 int i;
320
321
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 9135 while (h--) {
322
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 1605744 for (i = 0; i < w; i++) {
323 1596672 const int u = usrc[i];
324 1596672 const int v = vsrc[i];
325
326 1596672 udst[i] = s->lut_u[u][v];
327 1596672 vdst[i] = s->lut_v[u][v];
328 }
329
330 9072 usrc += src_linesize;
331 9072 vsrc += src_linesize;
332 9072 udst += dst_linesize;
333 9072 vdst += dst_linesize;
334 }
335 63 }
336
337 21 static void apply_lut10(HueContext *s,
338 uint16_t *udst, uint16_t *vdst, const int dst_linesize,
339 uint16_t *usrc, uint16_t *vsrc, const int src_linesize,
340 int w, int h)
341 {
342 int i;
343
344
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 6069 while (h--) {
345
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 1070496 for (i = 0; i < w; i++) {
346 1064448 const int u = av_clip_uintp2(usrc[i], 10);
347 1064448 const int v = av_clip_uintp2(vsrc[i], 10);
348
349 1064448 udst[i] = s->lut_u10[u][v];
350 1064448 vdst[i] = s->lut_v10[u][v];
351 }
352
353 6048 usrc += src_linesize;
354 6048 vsrc += src_linesize;
355 6048 udst += dst_linesize;
356 6048 vdst += dst_linesize;
357 }
358 21 }
359
360 84 static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
361 {
362 84 FilterLink *inl = ff_filter_link(inlink);
363 84 HueContext *hue = inlink->dst->priv;
364 84 AVFilterLink *outlink = inlink->dst->outputs[0];
365 AVFrame *outpic;
366 84 const int32_t old_hue_sin = hue->hue_sin, old_hue_cos = hue->hue_cos;
367 84 const float old_brightness = hue->brightness;
368 84 int direct = 0;
369 84 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
370
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 84 const int bps = desc->comp[0].depth > 8 ? 2 : 1;
371
372
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 84 if (av_frame_is_writable(inpic)) {
373 84 direct = 1;
374 84 outpic = inpic;
375 } else {
376 ✗ outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
377 ✗ if (!outpic) {
378 ✗ av_frame_free(&inpic);
379 ✗ return AVERROR(ENOMEM);
380 }
381 ✗ av_frame_copy_props(outpic, inpic);
382 }
383
384 84 hue->var_values[VAR_N] = inl->frame_count_out;
385
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 84 hue->var_values[VAR_T] = TS2T(inpic->pts, inlink->time_base);
386
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 84 hue->var_values[VAR_PTS] = TS2D(inpic->pts);
387
388
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 84 if (hue->saturation_expr) {
389 84 hue->saturation = av_expr_eval(hue->saturation_pexpr, hue->var_values, NULL);
390
391
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 84 if (hue->saturation < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) {
392 ✗ hue->saturation = av_clip(hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL);
393 ✗ av_log(inlink->dst, AV_LOG_WARNING,
394 "Saturation value not in range [%d,%d]: clipping value to %0.1f\n",
395 ✗ SAT_MIN_VAL, SAT_MAX_VAL, hue->saturation);
396 }
397 }
398
399
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 84 if (hue->brightness_expr) {
400 84 hue->brightness = av_expr_eval(hue->brightness_pexpr, hue->var_values, NULL);
401
402
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 84 if (hue->brightness < -10 || hue->brightness > 10) {
403 ✗ hue->brightness = av_clipf(hue->brightness, -10, 10);
404 ✗ av_log(inlink->dst, AV_LOG_WARNING,
405 "Brightness value not in range [%d,%d]: clipping value to %0.1f\n",
406 ✗ -10, 10, hue->brightness);
407 }
408 }
409
410
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 84 if (hue->hue_deg_expr) {
411 42 hue->hue_deg = av_expr_eval(hue->hue_deg_pexpr, hue->var_values, NULL);
412 42 hue->hue = hue->hue_deg * M_PI / 180;
413
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 42 } else if (hue->hue_expr) {
414 ✗ hue->hue = av_expr_eval(hue->hue_pexpr, hue->var_values, NULL);
415 ✗ hue->hue_deg = hue->hue * 180 / M_PI;
416 }
417
418 84 av_log(inlink->dst, AV_LOG_DEBUG,
419 "H:%0.1f*PI h:%0.1f s:%0.1f b:%0.f t:%0.1f n:%d\n",
420 84 hue->hue/M_PI, hue->hue_deg, hue->saturation, hue->brightness,
421 84 hue->var_values[VAR_T], (int)hue->var_values[VAR_N]);
422
423 84 compute_sin_and_cos(hue);
424
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 84 if (hue->is_first || (old_hue_sin != hue->hue_sin || old_hue_cos != hue->hue_cos))
425 64 create_chrominance_lut(hue, hue->hue_cos, hue->hue_sin);
426
427
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 84 if (hue->is_first || (old_brightness != hue->brightness && hue->brightness))
428 23 create_luma_lut(hue);
429
430
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 84 if (!direct) {
431 ✗ if (!hue->brightness)
432 ✗ av_image_copy_plane(outpic->data[0], outpic->linesize[0],
433 ✗ inpic->data[0], inpic->linesize[0],
434 ✗ inlink->w * bps, inlink->h);
435 ✗ if (inpic->data[3])
436 ✗ av_image_copy_plane(outpic->data[3], outpic->linesize[3],
437 ✗ inpic->data[3], inpic->linesize[3],
438 ✗ inlink->w * bps, inlink->h);
439 }
440
441
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 84 if (bps > 1) {
442 21 apply_lut10(hue, (uint16_t*)outpic->data[1], (uint16_t*)outpic->data[2], outpic->linesize[1]/2,
443 21 (uint16_t*) inpic->data[1], (uint16_t*) inpic->data[2], inpic->linesize[1]/2,
444 21 AV_CEIL_RSHIFT(inlink->w, hue->hsub),
445 21 AV_CEIL_RSHIFT(inlink->h, hue->vsub));
446
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 21 if (hue->brightness)
447 ✗ apply_luma_lut10(hue, (uint16_t*)outpic->data[0], outpic->linesize[0]/2,
448 ✗ (uint16_t*) inpic->data[0], inpic->linesize[0]/2, inlink->w, inlink->h);
449 } else {
450 63 apply_lut(hue, outpic->data[1], outpic->data[2], outpic->linesize[1],
451 63 inpic->data[1], inpic->data[2], inpic->linesize[1],
452 63 AV_CEIL_RSHIFT(inlink->w, hue->hsub),
453 63 AV_CEIL_RSHIFT(inlink->h, hue->vsub));
454
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 63 if (hue->brightness)
455 20 apply_luma_lut(hue, outpic->data[0], outpic->linesize[0],
456 20 inpic->data[0], inpic->linesize[0], inlink->w, inlink->h);
457 }
458
459
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 84 if (!direct)
460 ✗ av_frame_free(&inpic);
461
462 84 hue->is_first = 0;
463 84 return ff_filter_frame(outlink, outpic);
464 }
465
466 ✗ static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
467 char *res, int res_len, int flags)
468 {
469 ✗ HueContext *hue = ctx->priv;
470 int ret;
471
472 #define SET_EXPR(expr, option) \
473 do { \
474 ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
475 args, option, ctx); \
476 if (ret < 0) \
477 return ret; \
478 } while (0)
479
480 ✗ if (!strcmp(cmd, "h")) {
481 ✗ SET_EXPR(hue_deg, "h");
482 ✗ av_freep(&hue->hue_expr);
483 ✗ } else if (!strcmp(cmd, "H")) {
484 ✗ SET_EXPR(hue, "H");
485 ✗ av_freep(&hue->hue_deg_expr);
486 ✗ } else if (!strcmp(cmd, "s")) {
487 ✗ SET_EXPR(saturation, "s");
488 ✗ } else if (!strcmp(cmd, "b")) {
489 ✗ SET_EXPR(brightness, "b");
490 } else
491 ✗ return AVERROR(ENOSYS);
492
493 ✗ return 0;
494 }
495
496 static const AVFilterPad hue_inputs[] = {
497 {
498 .name = "default",
499 .type = AVMEDIA_TYPE_VIDEO,
500 .filter_frame = filter_frame,
501 .config_props = config_props,
502 },
503 };
504
505 const FFFilter ff_vf_hue = {
506 .p.name = "hue",
507 .p.description = NULL_IF_CONFIG_SMALL("Adjust the hue and saturation of the input video."),
508 .p.priv_class = &hue_class,
509 .p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
510 .priv_size = sizeof(HueContext),
511 .init = init,
512 .uninit = uninit,
513 .process_command = process_command,
514 FILTER_INPUTS(hue_inputs),
515 FILTER_OUTPUTS(ff_video_default_filterpad),
516 FILTER_PIXFMTS_ARRAY(pix_fmts),
517 };
518