FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_pad.c
Date: 2026-04-22 18:56:46
Exec Total Coverage
Lines: 145 191 75.9%
Functions: 7 7 100.0%
Branches: 68 132 51.5%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2008 vmrsss
3 * Copyright (c) 2009 Stefano Sabatini
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 * video padding filter
25 */
26
27 #include <float.h> /* DBL_MAX */
28
29 #include "avfilter.h"
30 #include "filters.h"
31 #include "formats.h"
32 #include "video.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/common.h"
35 #include "libavutil/eval.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavutil/colorspace.h"
38 #include "libavutil/imgutils.h"
39 #include "libavutil/parseutils.h"
40 #include "libavutil/mathematics.h"
41 #include "libavutil/opt.h"
42
43 #include "drawutils.h"
44
45 static const char *const var_names[] = {
46 "in_w", "iw",
47 "in_h", "ih",
48 "out_w", "ow",
49 "out_h", "oh",
50 "x",
51 "y",
52 "a",
53 "sar",
54 "dar",
55 "hsub",
56 "vsub",
57 NULL
58 };
59
60 enum var_name {
61 VAR_IN_W, VAR_IW,
62 VAR_IN_H, VAR_IH,
63 VAR_OUT_W, VAR_OW,
64 VAR_OUT_H, VAR_OH,
65 VAR_X,
66 VAR_Y,
67 VAR_A,
68 VAR_SAR,
69 VAR_DAR,
70 VAR_HSUB,
71 VAR_VSUB,
72 VARS_NB
73 };
74
75 110 static int query_formats(const AVFilterContext *ctx,
76 AVFilterFormatsConfig **cfg_in,
77 AVFilterFormatsConfig **cfg_out)
78 {
79 110 return ff_set_common_formats2(ctx, cfg_in, cfg_out,
80 ff_draw_supported_pixel_formats(0));
81 }
82
83 enum EvalMode {
84 EVAL_MODE_INIT,
85 EVAL_MODE_FRAME,
86 EVAL_MODE_NB
87 };
88
89 typedef struct PadContext {
90 const AVClass *class;
91 int w, h; ///< output dimensions, a value of 0 will result in the input size
92 int x, y; ///< offsets of the input area with respect to the padded area
93 int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
94 int inlink_w, inlink_h;
95 AVRational aspect;
96
97 char *w_expr; ///< width expression string
98 char *h_expr; ///< height expression string
99 char *x_expr; ///< width expression string
100 char *y_expr; ///< height expression string
101 uint8_t rgba_color[4]; ///< color for the padding area
102 FFDrawContext draw;
103 FFDrawColor color;
104
105 int eval_mode; ///< expression evaluation mode
106 } PadContext;
107
108 109 static int config_input(AVFilterLink *inlink)
109 {
110 109 AVFilterContext *ctx = inlink->dst;
111 109 PadContext *s = ctx->priv;
112 109 AVRational adjusted_aspect = s->aspect;
113 int ret;
114 double var_values[VARS_NB], res;
115 char *expr;
116
117 109 ret = ff_draw_init_from_link(&s->draw, inlink, 0);
118
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 109 if (ret < 0) {
119 ✗ av_log(ctx, AV_LOG_ERROR, "Failed to initialize FFDrawContext\n");
120 ✗ return ret;
121 }
122 109 ff_draw_color(&s->draw, &s->color, s->rgba_color);
123
124 109 var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
125 109 var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
126 109 var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
127 109 var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
128 109 var_values[VAR_A] = (double) inlink->w / inlink->h;
129 218 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
130
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 109 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
131 109 var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
132 109 var_values[VAR_HSUB] = 1 << s->draw.hsub_max;
133 109 var_values[VAR_VSUB] = 1 << s->draw.vsub_max;
134
135 /* evaluate width and height */
136 109 av_expr_parse_and_eval(&res, (expr = s->w_expr),
137 var_names, var_values,
138 NULL, NULL, NULL, NULL, NULL, 0, ctx);
139 109 s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
140
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 109 if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
141 var_names, var_values,
142 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
143 ✗ goto eval_fail;
144 109 s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
145
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 109 if (!s->h)
146 ✗ var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h = inlink->h;
147
148 /* evaluate the width again, as it may depend on the evaluated output height */
149
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 109 if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
150 var_names, var_values,
151 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
152 ✗ goto eval_fail;
153 109 s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
154
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 109 if (!s->w)
155 ✗ var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w = inlink->w;
156
157
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 109 if (adjusted_aspect.num && adjusted_aspect.den) {
158 ✗ adjusted_aspect = av_div_q(adjusted_aspect, inlink->sample_aspect_ratio);
159 ✗ if (s->h < av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num)) {
160 ✗ s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num);
161 } else {
162 ✗ s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = av_rescale(s->h, adjusted_aspect.num, adjusted_aspect.den);
163 }
164 }
165
166 /* evaluate x and y */
167 109 av_expr_parse_and_eval(&res, (expr = s->x_expr),
168 var_names, var_values,
169 NULL, NULL, NULL, NULL, NULL, 0, ctx);
170 109 s->x = var_values[VAR_X] = res;
171
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 109 if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
172 var_names, var_values,
173 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
174 ✗ goto eval_fail;
175 109 s->y = var_values[VAR_Y] = res;
176 /* evaluate x again, as it may depend on the evaluated y value */
177
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 109 if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
178 var_names, var_values,
179 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
180 ✗ goto eval_fail;
181 109 s->x = var_values[VAR_X] = res;
182
183
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 109 if (s->x < 0 || s->x + inlink->w > s->w)
184 ✗ s->x = var_values[VAR_X] = (s->w - inlink->w) / 2;
185
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 109 if (s->y < 0 || s->y + inlink->h > s->h)
186 ✗ s->y = var_values[VAR_Y] = (s->h - inlink->h) / 2;
187
188 109 s->w = ff_draw_round_to_sub(&s->draw, 0, -1, s->w);
189 109 s->h = ff_draw_round_to_sub(&s->draw, 1, -1, s->h);
190 /* sanity check params */
191
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 109 if (s->w < inlink->w || s->h < inlink->h) {
192 ✗ av_log(ctx, AV_LOG_ERROR, "Padded dimensions cannot be smaller than input dimensions.\n");
193 ✗ return AVERROR(EINVAL);
194 }
195
196 109 s->x = ff_draw_round_to_sub(&s->draw, 0, -1, s->x);
197 109 s->y = ff_draw_round_to_sub(&s->draw, 1, -1, s->y);
198 109 s->in_w = ff_draw_round_to_sub(&s->draw, 0, -1, inlink->w);
199 109 s->in_h = ff_draw_round_to_sub(&s->draw, 1, -1, inlink->h);
200 109 s->inlink_w = inlink->w;
201 109 s->inlink_h = inlink->h;
202
203 109 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X\n",
204 inlink->w, inlink->h, s->w, s->h, s->x, s->y,
205 109 s->rgba_color[0], s->rgba_color[1], s->rgba_color[2], s->rgba_color[3]);
206
207
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 109 if (s->x < 0 || s->y < 0 ||
208
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 109 s->w <= 0 || s->h <= 0 ||
209
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 109 (unsigned)s->x + (unsigned)inlink->w > s->w ||
210
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 109 (unsigned)s->y + (unsigned)inlink->h > s->h) {
211 ✗ av_log(ctx, AV_LOG_ERROR,
212 "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
213 ✗ s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->h);
214 ✗ return AVERROR(EINVAL);
215 }
216
217 109 return 0;
218
219 ✗ eval_fail:
220 ✗ av_log(ctx, AV_LOG_ERROR,
221 "Error when evaluating the expression '%s'\n", expr);
222 ✗ return ret;
223
224 }
225
226 109 static int config_output(AVFilterLink *outlink)
227 {
228 109 PadContext *s = outlink->src->priv;
229
230 109 outlink->w = s->w;
231 109 outlink->h = s->h;
232 109 return 0;
233 }
234
235 532 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
236 {
237 532 PadContext *s = inlink->dst->priv;
238 AVFrame *frame;
239 int plane;
240
241
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 532 if (s->inlink_w <= 0)
242 ✗ return NULL;
243
244 532 frame = ff_get_video_buffer(inlink->dst->outputs[0],
245 532 w + (s->w - s->in_w),
246 532 h + (s->h - s->in_h) + (s->x > 0));
247
248
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 532 if (!frame)
249 ✗ return NULL;
250
251 532 frame->width = w;
252 532 frame->height = h;
253
254
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 2186 for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
255 1654 int hsub = s->draw.hsub[plane];
256 1654 int vsub = s->draw.vsub[plane];
257 1654 frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] +
258 1654 (s->y >> vsub) * frame->linesize[plane];
259 }
260
261 532 return frame;
262 }
263
264 /* check whether each plane in this buffer can be padded without copying */
265 1662 static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
266 {
267 1662 int planes[4] = { -1, -1, -1, -1}, *p = planes;
268 int i, j;
269
270 /* get all planes in this buffer */
271
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 7540 for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) {
272
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 5878 if (av_frame_get_plane_buffer(frame, i) == buf)
273 1662 *p++ = i;
274 }
275
276 /* for each plane in this buffer, check that it can be padded without
277 * going over buffer bounds or other planes */
278
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 3310 for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) {
279 1662 int hsub = s->draw.hsub[planes[i]];
280 1662 int vsub = s->draw.vsub[planes[i]];
281
282 1662 uint8_t *start = frame->data[planes[i]];
283 1662 uint8_t *end = start + (frame->height >> vsub) *
284 1662 frame->linesize[planes[i]];
285
286 /* amount of free space needed before the start and after the end
287 * of the plane */
288 1662 ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] +
289 1662 (s->y >> vsub) * frame->linesize[planes[i]];
290 1662 ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) *
291 1662 s->draw.pixelstep[planes[i]] +
292 1662 ((s->h - s->y - frame->height) >> vsub) * frame->linesize[planes[i]];
293
294
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 1662 if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]])
295 14 return 1;
296
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 1648 if (start - buf->data < req_start ||
297
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 1648 (buf->data + buf->size) - end < req_end)
298 ✗ return 1;
299
300
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 3296 for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {
301 1648 int vsub1 = s->draw.vsub[planes[j]];
302 1648 uint8_t *start1 = frame->data[planes[j]];
303 1648 uint8_t *end1 = start1 + (frame->height >> vsub1) *
304 1648 frame->linesize[planes[j]];
305
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 1648 if (i == j)
306 1648 continue;
307
308 ✗ if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) ||
309 ✗ FFSIGN(end - start1) != FFSIGN(end - start1 + req_end))
310 ✗ return 1;
311 }
312 }
313
314 1648 return 0;
315 }
316
317 544 static int frame_needs_copy(PadContext *s, AVFrame *frame)
318 {
319 int i;
320
321
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 544 if (!av_frame_is_writable(frame))
322 ✗ return 1;
323
324
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 2192 for (i = 0; i < 4 && frame->buf[i]; i++)
325
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 1662 if (buffer_needs_copy(s, frame, frame->buf[i]))
326 14 return 1;
327 530 return 0;
328 }
329
330 544 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
331 {
332 544 PadContext *s = inlink->dst->priv;
333 544 AVFilterLink *outlink = inlink->dst->outputs[0];
334 AVFrame *out;
335 int needs_copy;
336
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 544 if(s->eval_mode == EVAL_MODE_FRAME && (
337 ✗ in->width != s->inlink_w
338 ✗ || in->height != s->inlink_h
339 ✗ || in->format != outlink->format
340 ✗ || in->sample_aspect_ratio.den != outlink->sample_aspect_ratio.den || in->sample_aspect_ratio.num != outlink->sample_aspect_ratio.num)) {
341 int ret;
342
343 ✗ inlink->dst->inputs[0]->format = in->format;
344 ✗ inlink->dst->inputs[0]->w = in->width;
345 ✗ inlink->dst->inputs[0]->h = in->height;
346
347 ✗ inlink->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
348 ✗ inlink->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
349
350
351 ✗ if ((ret = config_input(inlink)) < 0) {
352 ✗ s->inlink_w = -1;
353 ✗ return ret;
354 }
355 ✗ if ((ret = config_output(outlink)) < 0) {
356 ✗ s->inlink_w = -1;
357 ✗ return ret;
358 }
359 }
360
361 544 needs_copy = frame_needs_copy(s, in);
362
363
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 544 if (needs_copy) {
364 14 av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
365 14 out = ff_get_video_buffer(outlink,
366 14 FFMAX(inlink->w, s->w),
367 14 FFMAX(inlink->h, s->h));
368
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 14 if (!out) {
369 ✗ av_frame_free(&in);
370 ✗ return AVERROR(ENOMEM);
371 }
372
373 14 av_frame_copy_props(out, in);
374 } else {
375 int i;
376
377 530 out = in;
378
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 2178 for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) {
379 1648 int hsub = s->draw.hsub[i];
380 1648 int vsub = s->draw.vsub[i];
381 1648 out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] +
382 1648 (s->y >> vsub) * out->linesize[i];
383 }
384 }
385
386 /* top bar */
387
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 544 if (s->y) {
388 544 ff_fill_rectangle(&s->draw, &s->color,
389 544 out->data, out->linesize,
390 0, 0, s->w, s->y);
391 }
392
393 /* bottom bar */
394
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 544 if (s->h > s->y + s->in_h) {
395 518 ff_fill_rectangle(&s->draw, &s->color,
396 518 out->data, out->linesize,
397 518 0, s->y + s->in_h, s->w, s->h - s->y - s->in_h);
398 }
399
400 /* left border */
401 544 ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
402 544 0, s->y, s->x, in->height);
403
404
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 544 if (needs_copy) {
405 14 ff_copy_rectangle2(&s->draw,
406 14 out->data, out->linesize, in->data, in->linesize,
407 14 s->x, s->y, 0, 0, in->width, in->height);
408 }
409
410 /* right border */
411 544 ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
412 544 s->x + s->in_w, s->y, s->w - s->x - s->in_w,
413 544 in->height);
414
415 544 out->width = s->w;
416 544 out->height = s->h;
417
418
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 544 if (in != out)
419 14 av_frame_free(&in);
420 544 return ff_filter_frame(outlink, out);
421 }
422
423 #define OFFSET(x) offsetof(PadContext, x)
424 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
425
426 static const AVOption pad_options[] = {
427 { "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
428 { "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
429 { "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
430 { "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
431 { "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
432 { "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
433 { "color", "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
434 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, .unit = "eval" },
435 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
436 { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
437 { "aspect", "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, DBL_MAX, FLAGS },
438 { NULL }
439 };
440
441 AVFILTER_DEFINE_CLASS(pad);
442
443 static const AVFilterPad avfilter_vf_pad_inputs[] = {
444 {
445 .name = "default",
446 .type = AVMEDIA_TYPE_VIDEO,
447 .config_props = config_input,
448 .get_buffer.video = get_video_buffer,
449 .filter_frame = filter_frame,
450 },
451 };
452
453 static const AVFilterPad avfilter_vf_pad_outputs[] = {
454 {
455 .name = "default",
456 .type = AVMEDIA_TYPE_VIDEO,
457 .config_props = config_output,
458 },
459 };
460
461 const FFFilter ff_vf_pad = {
462 .p.name = "pad",
463 .p.description = NULL_IF_CONFIG_SMALL("Pad the input video."),
464 .p.priv_class = &pad_class,
465 .priv_size = sizeof(PadContext),
466 FILTER_INPUTS(avfilter_vf_pad_inputs),
467 FILTER_OUTPUTS(avfilter_vf_pad_outputs),
468 FILTER_QUERY_FUNC2(query_formats),
469 };
470