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path: root/libavfilter/vf_eq.c (plain)
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1/*
2 * Original MPlayer filters by Richard Felker, Hampa Hug, Daniel Moreno,
3 * and Michael Niedermeyer.
4 *
5 * Copyright (c) 2014 James Darnley <james.darnley@gmail.com>
6 * Copyright (c) 2015 Arwa Arif <arwaarif1994@gmail.com>
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 */
24
25/**
26 * @file
27 * very simple video equalizer
28 */
29
30#include "libavfilter/internal.h"
31#include "libavutil/common.h"
32#include "libavutil/imgutils.h"
33#include "libavutil/opt.h"
34#include "libavutil/pixdesc.h"
35#include "vf_eq.h"
36
37static void create_lut(EQParameters *param)
38{
39 int i;
40 double g = 1.0 / param->gamma;
41 double lw = 1.0 - param->gamma_weight;
42
43 for (i = 0; i < 256; i++) {
44 double v = i / 255.0;
45 v = param->contrast * (v - 0.5) + 0.5 + param->brightness;
46
47 if (v <= 0.0) {
48 param->lut[i] = 0;
49 } else {
50 v = v * lw + pow(v, g) * param->gamma_weight;
51
52 if (v >= 1.0)
53 param->lut[i] = 255;
54 else
55 param->lut[i] = 256.0 * v;
56 }
57 }
58
59 param->lut_clean = 1;
60}
61
62static void apply_lut(EQParameters *param, uint8_t *dst, int dst_stride,
63 const uint8_t *src, int src_stride, int w, int h)
64{
65 int x, y;
66
67 if (!param->lut_clean)
68 create_lut(param);
69
70 for (y = 0; y < h; y++) {
71 for (x = 0; x < w; x++) {
72 dst[y * dst_stride + x] = param->lut[src[y * src_stride + x]];
73 }
74 }
75}
76
77static void process_c(EQParameters *param, uint8_t *dst, int dst_stride,
78 const uint8_t *src, int src_stride, int w, int h)
79{
80 int x, y, pel;
81
82 int contrast = (int) (param->contrast * 256 * 16);
83 int brightness = ((int) (100.0 * param->brightness + 100.0) * 511) / 200 - 128 - contrast / 32;
84
85 for (y = 0; y < h; y++) {
86 for (x = 0; x < w; x++) {
87 pel = ((src[y * src_stride + x] * contrast) >> 12) + brightness;
88
89 if (pel & ~255)
90 pel = (-pel) >> 31;
91
92 dst[y * dst_stride + x] = pel;
93 }
94 }
95}
96
97static void check_values(EQParameters *param, EQContext *eq)
98{
99 if (param->contrast == 1.0 && param->brightness == 0.0 && param->gamma == 1.0)
100 param->adjust = NULL;
101 else if (param->gamma == 1.0 && fabs(param->contrast) < 7.9)
102 param->adjust = eq->process;
103 else
104 param->adjust = apply_lut;
105}
106
107static void set_contrast(EQContext *eq)
108{
109 eq->contrast = av_clipf(av_expr_eval(eq->contrast_pexpr, eq->var_values, eq), -1000.0, 1000.0);
110 eq->param[0].contrast = eq->contrast;
111 eq->param[0].lut_clean = 0;
112 check_values(&eq->param[0], eq);
113}
114
115static void set_brightness(EQContext *eq)
116{
117 eq->brightness = av_clipf(av_expr_eval(eq->brightness_pexpr, eq->var_values, eq), -1.0, 1.0);
118 eq->param[0].brightness = eq->brightness;
119 eq->param[0].lut_clean = 0;
120 check_values(&eq->param[0], eq);
121}
122
123static void set_gamma(EQContext *eq)
124{
125 int i;
126
127 eq->gamma = av_clipf(av_expr_eval(eq->gamma_pexpr, eq->var_values, eq), 0.1, 10.0);
128 eq->gamma_r = av_clipf(av_expr_eval(eq->gamma_r_pexpr, eq->var_values, eq), 0.1, 10.0);
129 eq->gamma_g = av_clipf(av_expr_eval(eq->gamma_g_pexpr, eq->var_values, eq), 0.1, 10.0);
130 eq->gamma_b = av_clipf(av_expr_eval(eq->gamma_b_pexpr, eq->var_values, eq), 0.1, 10.0);
131 eq->gamma_weight = av_clipf(av_expr_eval(eq->gamma_weight_pexpr, eq->var_values, eq), 0.0, 1.0);
132
133 eq->param[0].gamma = eq->gamma * eq->gamma_g;
134 eq->param[1].gamma = sqrt(eq->gamma_b / eq->gamma_g);
135 eq->param[2].gamma = sqrt(eq->gamma_r / eq->gamma_g);
136
137 for (i = 0; i < 3; i++) {
138 eq->param[i].gamma_weight = eq->gamma_weight;
139 eq->param[i].lut_clean = 0;
140 check_values(&eq->param[i], eq);
141 }
142}
143
144static void set_saturation(EQContext *eq)
145{
146 int i;
147
148 eq->saturation = av_clipf(av_expr_eval(eq->saturation_pexpr, eq->var_values, eq), 0.0, 3.0);
149
150 for (i = 1; i < 3; i++) {
151 eq->param[i].contrast = eq->saturation;
152 eq->param[i].lut_clean = 0;
153 check_values(&eq->param[i], eq);
154 }
155}
156
157static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
158{
159 int ret;
160 AVExpr *old = NULL;
161
162 if (*pexpr)
163 old = *pexpr;
164 ret = av_expr_parse(pexpr, expr, var_names, NULL, NULL, NULL, NULL, 0, log_ctx);
165 if (ret < 0) {
166 av_log(log_ctx, AV_LOG_ERROR,
167 "Error when parsing the expression '%s' for %s\n",
168 expr, option);
169 *pexpr = old;
170 return ret;
171 }
172
173 av_expr_free(old);
174 return 0;
175}
176
177static int initialize(AVFilterContext *ctx)
178{
179 EQContext *eq = ctx->priv;
180 int ret;
181
182 eq->process = process_c;
183
184 if ((ret = set_expr(&eq->contrast_pexpr, eq->contrast_expr, "contrast", ctx)) < 0 ||
185 (ret = set_expr(&eq->brightness_pexpr, eq->brightness_expr, "brightness", ctx)) < 0 ||
186 (ret = set_expr(&eq->saturation_pexpr, eq->saturation_expr, "saturation", ctx)) < 0 ||
187 (ret = set_expr(&eq->gamma_pexpr, eq->gamma_expr, "gamma", ctx)) < 0 ||
188 (ret = set_expr(&eq->gamma_r_pexpr, eq->gamma_r_expr, "gamma_r", ctx)) < 0 ||
189 (ret = set_expr(&eq->gamma_g_pexpr, eq->gamma_g_expr, "gamma_g", ctx)) < 0 ||
190 (ret = set_expr(&eq->gamma_b_pexpr, eq->gamma_b_expr, "gamma_b", ctx)) < 0 ||
191 (ret = set_expr(&eq->gamma_weight_pexpr, eq->gamma_weight_expr, "gamma_weight", ctx)) < 0 )
192 return ret;
193
194 if (ARCH_X86)
195 ff_eq_init_x86(eq);
196
197 if (eq->eval_mode == EVAL_MODE_INIT) {
198 set_gamma(eq);
199 set_contrast(eq);
200 set_brightness(eq);
201 set_saturation(eq);
202 }
203
204 return 0;
205}
206
207static void uninit(AVFilterContext *ctx)
208{
209 EQContext *eq = ctx->priv;
210
211 av_expr_free(eq->contrast_pexpr); eq->contrast_pexpr = NULL;
212 av_expr_free(eq->brightness_pexpr); eq->brightness_pexpr = NULL;
213 av_expr_free(eq->saturation_pexpr); eq->saturation_pexpr = NULL;
214 av_expr_free(eq->gamma_pexpr); eq->gamma_pexpr = NULL;
215 av_expr_free(eq->gamma_weight_pexpr); eq->gamma_weight_pexpr = NULL;
216 av_expr_free(eq->gamma_r_pexpr); eq->gamma_r_pexpr = NULL;
217 av_expr_free(eq->gamma_g_pexpr); eq->gamma_g_pexpr = NULL;
218 av_expr_free(eq->gamma_b_pexpr); eq->gamma_b_pexpr = NULL;
219}
220
221static int config_props(AVFilterLink *inlink)
222{
223 EQContext *eq = inlink->dst->priv;
224
225 eq->var_values[VAR_N] = 0;
226 eq->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
227 NAN : av_q2d(inlink->frame_rate);
228
229 return 0;
230}
231
232static int query_formats(AVFilterContext *ctx)
233{
234 static const enum AVPixelFormat pixel_fmts_eq[] = {
235 AV_PIX_FMT_GRAY8,
236 AV_PIX_FMT_YUV410P,
237 AV_PIX_FMT_YUV411P,
238 AV_PIX_FMT_YUV420P,
239 AV_PIX_FMT_YUV422P,
240 AV_PIX_FMT_YUV444P,
241 AV_PIX_FMT_NONE
242 };
243 AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_eq);
244 if (!fmts_list)
245 return AVERROR(ENOMEM);
246 return ff_set_common_formats(ctx, fmts_list);
247}
248
249#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb))
250
251static int filter_frame(AVFilterLink *inlink, AVFrame *in)
252{
253 AVFilterContext *ctx = inlink->dst;
254 AVFilterLink *outlink = inlink->dst->outputs[0];
255 EQContext *eq = ctx->priv;
256 AVFrame *out;
257 int64_t pos = av_frame_get_pkt_pos(in);
258 const AVPixFmtDescriptor *desc;
259 int i;
260
261 out = ff_get_video_buffer(outlink, inlink->w, inlink->h);
262 if (!out)
263 return AVERROR(ENOMEM);
264
265 av_frame_copy_props(out, in);
266 desc = av_pix_fmt_desc_get(inlink->format);
267
268 eq->var_values[VAR_N] = inlink->frame_count_out;
269 eq->var_values[VAR_POS] = pos == -1 ? NAN : pos;
270 eq->var_values[VAR_T] = TS2T(in->pts, inlink->time_base);
271
272 if (eq->eval_mode == EVAL_MODE_FRAME) {
273 set_gamma(eq);
274 set_contrast(eq);
275 set_brightness(eq);
276 set_saturation(eq);
277 }
278
279 for (i = 0; i < desc->nb_components; i++) {
280 int w = inlink->w;
281 int h = inlink->h;
282
283 if (i == 1 || i == 2) {
284 w = AV_CEIL_RSHIFT(w, desc->log2_chroma_w);
285 h = AV_CEIL_RSHIFT(h, desc->log2_chroma_h);
286 }
287
288 if (eq->param[i].adjust)
289 eq->param[i].adjust(&eq->param[i], out->data[i], out->linesize[i],
290 in->data[i], in->linesize[i], w, h);
291 else
292 av_image_copy_plane(out->data[i], out->linesize[i],
293 in->data[i], in->linesize[i], w, h);
294 }
295
296 av_frame_free(&in);
297 return ff_filter_frame(outlink, out);
298}
299
300static inline int set_param(AVExpr **pexpr, const char *args, const char *cmd,
301 void (*set_fn)(EQContext *eq), AVFilterContext *ctx)
302{
303 EQContext *eq = ctx->priv;
304 int ret;
305 if ((ret = set_expr(pexpr, args, cmd, ctx)) < 0)
306 return ret;
307 if (eq->eval_mode == EVAL_MODE_INIT)
308 set_fn(eq);
309 return 0;
310}
311
312static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
313 char *res, int res_len, int flags)
314{
315 EQContext *eq = ctx->priv;
316
317#define SET_PARAM(param_name, set_fn_name) \
318 if (!strcmp(cmd, #param_name)) return set_param(&eq->param_name##_pexpr, args, cmd, set_##set_fn_name, ctx);
319
320 SET_PARAM(contrast, contrast)
321 else SET_PARAM(brightness, brightness)
322 else SET_PARAM(saturation, saturation)
323 else SET_PARAM(gamma, gamma)
324 else SET_PARAM(gamma_r, gamma)
325 else SET_PARAM(gamma_g, gamma)
326 else SET_PARAM(gamma_b, gamma)
327 else SET_PARAM(gamma_weight, gamma)
328 else return AVERROR(ENOSYS);
329}
330
331static const AVFilterPad eq_inputs[] = {
332 {
333 .name = "default",
334 .type = AVMEDIA_TYPE_VIDEO,
335 .filter_frame = filter_frame,
336 .config_props = config_props,
337 },
338 { NULL }
339};
340
341static const AVFilterPad eq_outputs[] = {
342 {
343 .name = "default",
344 .type = AVMEDIA_TYPE_VIDEO,
345 },
346 { NULL }
347};
348
349#define OFFSET(x) offsetof(EQContext, x)
350#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
351
352static const AVOption eq_options[] = {
353 { "contrast", "set the contrast adjustment, negative values give a negative image",
354 OFFSET(contrast_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
355 { "brightness", "set the brightness adjustment",
356 OFFSET(brightness_expr), AV_OPT_TYPE_STRING, {.str = "0.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
357 { "saturation", "set the saturation adjustment",
358 OFFSET(saturation_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
359 { "gamma", "set the initial gamma value",
360 OFFSET(gamma_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
361 { "gamma_r", "gamma value for red",
362 OFFSET(gamma_r_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
363 { "gamma_g", "gamma value for green",
364 OFFSET(gamma_g_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
365 { "gamma_b", "gamma value for blue",
366 OFFSET(gamma_b_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
367 { "gamma_weight", "set the gamma weight which reduces the effect of gamma on bright areas",
368 OFFSET(gamma_weight_expr), AV_OPT_TYPE_STRING, {.str = "1.0"}, CHAR_MIN, CHAR_MAX, FLAGS },
369 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
370 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
371 { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
372 { NULL }
373};
374
375AVFILTER_DEFINE_CLASS(eq);
376
377AVFilter ff_vf_eq = {
378 .name = "eq",
379 .description = NULL_IF_CONFIG_SMALL("Adjust brightness, contrast, gamma, and saturation."),
380 .priv_size = sizeof(EQContext),
381 .priv_class = &eq_class,
382 .inputs = eq_inputs,
383 .outputs = eq_outputs,
384 .process_command = process_command,
385 .query_formats = query_formats,
386 .init = initialize,
387 .uninit = uninit,
388 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
389};
390
generated by cgit at 2024-05-17 05:05:17 (GMT)