1 /*
2 * Copyright (c) 2020 Paul B Mahol
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 "avfilter.h"
22 #include "filters.h"
23 #include "formats.h"
24 #include "video.h"
25 #include "internal.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/parseutils.h"
30 #include "libavutil/lfg.h"
31 #include "libavutil/random_seed.h"
32 #include <float.h>
33 #include <math.h>
34
35 typedef struct GradientsContext {
36 const AVClass *class;
37 int w, h;
38 int type;
39 AVRational frame_rate;
40 int64_t pts;
41 int64_t duration; ///< duration expressed in microseconds
42 float speed;
43
44 uint8_t color_rgba[8][4];
45 int nb_colors;
46 int x0, y0, x1, y1;
47 float fx0, fy0, fx1, fy1;
48
49 int64_t seed;
50
51 AVLFG lfg;
52 int (*draw_slice)(AVFilterContext *ctx, void *arg, int job, int nb_jobs);
53 } GradientsContext;
54
55 #define OFFSET(x) offsetof(GradientsContext, x)
56 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
57
58 static const AVOption gradients_options[] = {
59 {"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
60 {"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
61 {"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
62 {"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
63 {"c0", "set 1st color", OFFSET(color_rgba[0]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
64 {"c1", "set 2nd color", OFFSET(color_rgba[1]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
65 {"c2", "set 3rd color", OFFSET(color_rgba[2]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
66 {"c3", "set 4th color", OFFSET(color_rgba[3]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
67 {"c4", "set 5th color", OFFSET(color_rgba[4]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
68 {"c5", "set 6th color", OFFSET(color_rgba[5]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
69 {"c6", "set 7th color", OFFSET(color_rgba[6]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
70 {"c7", "set 8th color", OFFSET(color_rgba[7]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
71 {"x0", "set gradient line source x0", OFFSET(x0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
72 {"y0", "set gradient line source y0", OFFSET(y0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
73 {"x1", "set gradient line destination x1", OFFSET(x1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
74 {"y1", "set gradient line destination y1", OFFSET(y1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
75 {"nb_colors", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
76 {"n", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
77 {"seed", "set the seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
78 {"duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\
79 {"d", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\
80 {"speed", "set gradients rotation speed", OFFSET(speed), AV_OPT_TYPE_FLOAT,{.dbl=0.01}, 0.00001, 1, FLAGS },\
81 {NULL},
82 };
83
84 AVFILTER_DEFINE_CLASS(gradients);
85
query_formats(AVFilterContext * ctx)86 static int query_formats(AVFilterContext *ctx)
87 {
88 static const enum AVPixelFormat pix_fmts[] = {
89 AV_PIX_FMT_RGBA,
90 AV_PIX_FMT_RGBA64,
91 AV_PIX_FMT_NONE
92 };
93
94 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
95 if (!fmts_list)
96 return AVERROR(ENOMEM);
97 return ff_set_common_formats(ctx, fmts_list);
98 }
99
lerp_color(uint8_t c0[4],uint8_t c1[4],float x)100 static uint32_t lerp_color(uint8_t c0[4], uint8_t c1[4], float x)
101 {
102 const float y = 1.f - x;
103
104 return (lrintf(c0[0] * y + c1[0] * x)) << 0 |
105 (lrintf(c0[1] * y + c1[1] * x)) << 8 |
106 (lrintf(c0[2] * y + c1[2] * x)) << 16 |
107 (lrintf(c0[3] * y + c1[3] * x)) << 24;
108 }
109
lerp_color16(uint8_t c0[4],uint8_t c1[4],float x)110 static uint64_t lerp_color16(uint8_t c0[4], uint8_t c1[4], float x)
111 {
112 const float y = 1.f - x;
113
114 return (llrintf((c0[0] * y + c1[0] * x) * 256)) << 0 |
115 (llrintf((c0[1] * y + c1[1] * x) * 256)) << 16 |
116 (llrintf((c0[2] * y + c1[2] * x) * 256)) << 32 |
117 (llrintf((c0[3] * y + c1[3] * x) * 256)) << 48;
118 }
119
lerp_colors(uint8_t arr[3][4],int nb_colors,float step)120 static uint32_t lerp_colors(uint8_t arr[3][4], int nb_colors, float step)
121 {
122 float scl;
123 int i;
124
125 if (nb_colors == 1 || step <= 0.0) {
126 return arr[0][0] | (arr[0][1] << 8) | (arr[0][2] << 16) | (arr[0][3] << 24);
127 } else if (step >= 1.0) {
128 i = nb_colors - 1;
129 return arr[i][0] | (arr[i][1] << 8) | (arr[i][2] << 16) | (arr[i][3] << 24);
130 }
131
132 scl = step * (nb_colors - 1);
133 i = floorf(scl);
134
135 return lerp_color(arr[i], arr[i + 1], scl - i);
136 }
137
lerp_colors16(uint8_t arr[3][4],int nb_colors,float step)138 static uint64_t lerp_colors16(uint8_t arr[3][4], int nb_colors, float step)
139 {
140 float scl;
141 int i;
142
143 if (nb_colors == 1 || step <= 0.0) {
144 return ((uint64_t)arr[0][0] << 8) | ((uint64_t)arr[0][1] << 24) | ((uint64_t)arr[0][2] << 40) | ((uint64_t)arr[0][3] << 56);
145 } else if (step >= 1.0) {
146 i = nb_colors - 1;
147 return ((uint64_t)arr[i][0] << 8) | ((uint64_t)arr[i][1] << 24) | ((uint64_t)arr[i][2] << 40) | ((uint64_t)arr[i][3] << 56);
148 }
149
150 scl = step * (nb_colors - 1);
151 i = floorf(scl);
152
153 return lerp_color16(arr[i], arr[i + 1], scl - i);
154 }
155
project(float origin_x,float origin_y,float dest_x,float dest_y,int point_x,int point_y)156 static float project(float origin_x, float origin_y,
157 float dest_x, float dest_y,
158 int point_x, int point_y)
159 {
160 // Rise and run of line.
161 float od_x = dest_x - origin_x;
162 float od_y = dest_y - origin_y;
163
164 // Distance-squared of line.
165 float od_s_q = od_x * od_x + od_y * od_y;
166
167 // Rise and run of projection.
168 float op_x = point_x - origin_x;
169 float op_y = point_y - origin_y;
170 float op_x_od = op_x * od_x + op_y * od_y;
171
172 // Normalize and clamp range.
173 return av_clipf(op_x_od / od_s_q, 0.f, 1.f);
174 }
175
draw_gradients_slice(AVFilterContext * ctx,void * arg,int job,int nb_jobs)176 static int draw_gradients_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
177 {
178 GradientsContext *s = ctx->priv;
179 AVFrame *frame = arg;
180 const int width = frame->width;
181 const int height = frame->height;
182 const int start = (height * job ) / nb_jobs;
183 const int end = (height * (job+1)) / nb_jobs;
184 const int linesize = frame->linesize[0] / 4;
185 uint32_t *dst = (uint32_t *)frame->data[0] + start * linesize;
186
187 for (int y = start; y < end; y++) {
188 for (int x = 0; x < width; x++) {
189 float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y);
190 dst[x] = lerp_colors(s->color_rgba, s->nb_colors, factor);
191 }
192
193 dst += linesize;
194 }
195
196 return 0;
197 }
198
draw_gradients_slice16(AVFilterContext * ctx,void * arg,int job,int nb_jobs)199 static int draw_gradients_slice16(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
200 {
201 GradientsContext *s = ctx->priv;
202 AVFrame *frame = arg;
203 const int width = frame->width;
204 const int height = frame->height;
205 const int start = (height * job ) / nb_jobs;
206 const int end = (height * (job+1)) / nb_jobs;
207 const int linesize = frame->linesize[0] / 8;
208 uint64_t *dst = (uint64_t *)frame->data[0] + start * linesize;
209
210 for (int y = start; y < end; y++) {
211 for (int x = 0; x < width; x++) {
212 float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y);
213 dst[x] = lerp_colors16(s->color_rgba, s->nb_colors, factor);
214 }
215
216 dst += linesize;
217 }
218
219 return 0;
220 }static int config_output(AVFilterLink *inlink)
221 {
222 AVFilterContext *ctx = inlink->src;
223 GradientsContext *s = ctx->priv;
224 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
225
226 if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
227 return AVERROR(EINVAL);
228
229 inlink->w = s->w;
230 inlink->h = s->h;
231 inlink->time_base = av_inv_q(s->frame_rate);
232 inlink->sample_aspect_ratio = (AVRational) {1, 1};
233 if (s->seed == -1)
234 s->seed = av_get_random_seed();
235 av_lfg_init(&s->lfg, s->seed);
236
237 s->draw_slice = desc->comp[0].depth == 16 ? draw_gradients_slice16 : draw_gradients_slice;
238
239 if (s->x0 < 0 || s->x0 >= s->w)
240 s->x0 = av_lfg_get(&s->lfg) % s->w;
241 if (s->y0 < 0 || s->y0 >= s->h)
242 s->y0 = av_lfg_get(&s->lfg) % s->h;
243 if (s->x1 < 0 || s->x1 >= s->w)
244 s->x1 = av_lfg_get(&s->lfg) % s->w;
245 if (s->y1 < 0 || s->y1 >= s->h)
246 s->y1 = av_lfg_get(&s->lfg) % s->h;
247
248 return 0;
249 }
250
activate(AVFilterContext * ctx)251 static int activate(AVFilterContext *ctx)
252 {
253 GradientsContext *s = ctx->priv;
254 AVFilterLink *outlink = ctx->outputs[0];
255
256 if (s->duration >= 0 &&
257 av_rescale_q(s->pts, outlink->time_base, AV_TIME_BASE_Q) >= s->duration) {
258 ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
259 return 0;
260 }
261
262 if (ff_outlink_frame_wanted(outlink)) {
263 AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h);
264 float angle = fmodf(s->pts * s->speed, 2.f * M_PI);
265 const float w2 = s->w / 2.f;
266 const float h2 = s->h / 2.f;
267
268 s->fx0 = (s->x0 - w2) * cosf(angle) - (s->y0 - h2) * sinf(angle) + w2;
269 s->fy0 = (s->x0 - w2) * sinf(angle) + (s->y0 - h2) * cosf(angle) + h2;
270
271 s->fx1 = (s->x1 - w2) * cosf(angle) - (s->y1 - h2) * sinf(angle) + w2;
272 s->fy1 = (s->x1 - w2) * sinf(angle) + (s->y1 - h2) * cosf(angle) + h2;
273
274 if (!frame)
275 return AVERROR(ENOMEM);
276
277 frame->key_frame = 1;
278 frame->interlaced_frame = 0;
279 frame->pict_type = AV_PICTURE_TYPE_I;
280 frame->sample_aspect_ratio = (AVRational) {1, 1};
281 frame->pts = s->pts++;
282
283 ctx->internal->execute(ctx, s->draw_slice, frame, NULL,
284 FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
285
286 return ff_filter_frame(outlink, frame);
287 }
288
289 return FFERROR_NOT_READY;
290 }
291
292 static const AVFilterPad gradients_outputs[] = {
293 {
294 .name = "default",
295 .type = AVMEDIA_TYPE_VIDEO,
296 .config_props = config_output,
297 },
298 { NULL }
299 };
300
301 AVFilter ff_vsrc_gradients = {
302 .name = "gradients",
303 .description = NULL_IF_CONFIG_SMALL("Draw a gradients."),
304 .priv_size = sizeof(GradientsContext),
305 .priv_class = &gradients_class,
306 .query_formats = query_formats,
307 .inputs = NULL,
308 .outputs = gradients_outputs,
309 .activate = activate,
310 .flags = AVFILTER_FLAG_SLICE_THREADS,
311 };
312