FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_pad.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 144 188 76.6%
Functions: 7 7 100.0%
Branches: 67 130 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
75 105 static int query_formats(const AVFilterContext *ctx,
76 AVFilterFormatsConfig **cfg_in,
77 AVFilterFormatsConfig **cfg_out)
78 {
79 105 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
108 104 static int config_input(AVFilterLink *inlink)
109 {
110 104 AVFilterContext *ctx = inlink->dst;
111 104 PadContext *s = ctx->priv;
112 104 AVRational adjusted_aspect = s->aspect;
113 int ret;
114 double var_values[VARS_NB], res;
115 char *expr;
116
117 104 ff_draw_init2(&s->draw, inlink->format, inlink->colorspace, inlink->color_range, 0);
118 104 ff_draw_color(&s->draw, &s->color, s->rgba_color);
119
120 104 var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
121 104 var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
122 104 var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
123 104 var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
124 104 var_values[VAR_A] = (double) inlink->w / inlink->h;
125 208 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
126
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 104 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
127 104 var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
128 104 var_values[VAR_HSUB] = 1 << s->draw.hsub_max;
129 104 var_values[VAR_VSUB] = 1 << s->draw.vsub_max;
130
131 /* evaluate width and height */
132 104 av_expr_parse_and_eval(&res, (expr = s->w_expr),
133 var_names, var_values,
134 NULL, NULL, NULL, NULL, NULL, 0, ctx);
135 104 s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
136
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 104 if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
137 var_names, var_values,
138 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
139 ✗ goto eval_fail;
140 104 s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
141
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 104 if (!s->h)
142 ✗ var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h = inlink->h;
143
144 /* evaluate the width again, as it may depend on the evaluated output height */
145
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 104 if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
146 var_names, var_values,
147 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
148 ✗ goto eval_fail;
149 104 s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
150
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 104 if (!s->w)
151 ✗ var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w = inlink->w;
152
153
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 104 if (adjusted_aspect.num && adjusted_aspect.den) {
154 ✗ adjusted_aspect = av_div_q(adjusted_aspect, inlink->sample_aspect_ratio);
155 ✗ if (s->h < av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num)) {
156 ✗ s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num);
157 } else {
158 ✗ s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = av_rescale(s->h, adjusted_aspect.num, adjusted_aspect.den);
159 }
160 }
161
162 /* evaluate x and y */
163 104 av_expr_parse_and_eval(&res, (expr = s->x_expr),
164 var_names, var_values,
165 NULL, NULL, NULL, NULL, NULL, 0, ctx);
166 104 s->x = var_values[VAR_X] = res;
167
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 104 if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
168 var_names, var_values,
169 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
170 ✗ goto eval_fail;
171 104 s->y = var_values[VAR_Y] = res;
172 /* evaluate x again, as it may depend on the evaluated y value */
173
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 104 if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
174 var_names, var_values,
175 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
176 ✗ goto eval_fail;
177 104 s->x = var_values[VAR_X] = res;
178
179
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 104 if (s->x < 0 || s->x + inlink->w > s->w)
180 ✗ s->x = var_values[VAR_X] = (s->w - inlink->w) / 2;
181
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 104 if (s->y < 0 || s->y + inlink->h > s->h)
182 ✗ s->y = var_values[VAR_Y] = (s->h - inlink->h) / 2;
183
184 104 s->w = ff_draw_round_to_sub(&s->draw, 0, -1, s->w);
185 104 s->h = ff_draw_round_to_sub(&s->draw, 1, -1, s->h);
186 /* sanity check params */
187
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 104 if (s->w < inlink->w || s->h < inlink->h) {
188 ✗ av_log(ctx, AV_LOG_ERROR, "Padded dimensions cannot be smaller than input dimensions.\n");
189 ✗ return AVERROR(EINVAL);
190 }
191
192 104 s->x = ff_draw_round_to_sub(&s->draw, 0, -1, s->x);
193 104 s->y = ff_draw_round_to_sub(&s->draw, 1, -1, s->y);
194 104 s->in_w = ff_draw_round_to_sub(&s->draw, 0, -1, inlink->w);
195 104 s->in_h = ff_draw_round_to_sub(&s->draw, 1, -1, inlink->h);
196 104 s->inlink_w = inlink->w;
197 104 s->inlink_h = inlink->h;
198
199 104 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",
200 inlink->w, inlink->h, s->w, s->h, s->x, s->y,
201 104 s->rgba_color[0], s->rgba_color[1], s->rgba_color[2], s->rgba_color[3]);
202
203
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 104 if (s->x < 0 || s->y < 0 ||
204
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 104 s->w <= 0 || s->h <= 0 ||
205
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 104 (unsigned)s->x + (unsigned)inlink->w > s->w ||
206
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 104 (unsigned)s->y + (unsigned)inlink->h > s->h) {
207 ✗ av_log(ctx, AV_LOG_ERROR,
208 "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
209 ✗ s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->h);
210 ✗ return AVERROR(EINVAL);
211 }
212
213 104 return 0;
214
215 ✗ eval_fail:
216 ✗ av_log(ctx, AV_LOG_ERROR,
217 "Error when evaluating the expression '%s'\n", expr);
218 ✗ return ret;
219
220 }
221
222 104 static int config_output(AVFilterLink *outlink)
223 {
224 104 PadContext *s = outlink->src->priv;
225
226 104 outlink->w = s->w;
227 104 outlink->h = s->h;
228 104 return 0;
229 }
230
231 426 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
232 {
233 426 PadContext *s = inlink->dst->priv;
234 AVFrame *frame;
235 int plane;
236
237
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 426 if (s->inlink_w <= 0)
238 ✗ return NULL;
239
240 426 frame = ff_get_video_buffer(inlink->dst->outputs[0],
241 426 w + (s->w - s->in_w),
242 426 h + (s->h - s->in_h) + (s->x > 0));
243
244
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 426 if (!frame)
245 ✗ return NULL;
246
247 426 frame->width = w;
248 426 frame->height = h;
249
250
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 1809 for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
251 1383 int hsub = s->draw.hsub[plane];
252 1383 int vsub = s->draw.vsub[plane];
253 1383 frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] +
254 1383 (s->y >> vsub) * frame->linesize[plane];
255 }
256
257 426 return frame;
258 }
259
260 /* check whether each plane in this buffer can be padded without copying */
261 1395 static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
262 {
263 1395 int planes[4] = { -1, -1, -1, -1}, *p = planes;
264 int i, j;
265
266 /* get all planes in this buffer */
267
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 6478 for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) {
268
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 5083 if (av_frame_get_plane_buffer(frame, i) == buf)
269 1395 *p++ = i;
270 }
271
272 /* for each plane in this buffer, check that it can be padded without
273 * going over buffer bounds or other planes */
274
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 2778 for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) {
275 1395 int hsub = s->draw.hsub[planes[i]];
276 1395 int vsub = s->draw.vsub[planes[i]];
277
278 1395 uint8_t *start = frame->data[planes[i]];
279 1395 uint8_t *end = start + (frame->height >> vsub) *
280 1395 frame->linesize[planes[i]];
281
282 /* amount of free space needed before the start and after the end
283 * of the plane */
284 1395 ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] +
285 1395 (s->y >> vsub) * frame->linesize[planes[i]];
286 1395 ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) *
287 1395 s->draw.pixelstep[planes[i]] +
288 1395 ((s->h - s->y - frame->height) >> vsub) * frame->linesize[planes[i]];
289
290
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 1395 if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]])
291 12 return 1;
292
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 1383 if (start - buf->data < req_start ||
293
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 1383 (buf->data + buf->size) - end < req_end)
294 ✗ return 1;
295
296
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 2766 for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {
297 1383 int vsub1 = s->draw.vsub[planes[j]];
298 1383 uint8_t *start1 = frame->data[planes[j]];
299 1383 uint8_t *end1 = start1 + (frame->height >> vsub1) *
300 1383 frame->linesize[planes[j]];
301
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 1383 if (i == j)
302 1383 continue;
303
304 ✗ if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) ||
305 ✗ FFSIGN(end - start1) != FFSIGN(end - start1 + req_end))
306 ✗ return 1;
307 }
308 }
309
310 1383 return 0;
311 }
312
313 438 static int frame_needs_copy(PadContext *s, AVFrame *frame)
314 {
315 int i;
316
317
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 438 if (!av_frame_is_writable(frame))
318 ✗ return 1;
319
320
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 1821 for (i = 0; i < 4 && frame->buf[i]; i++)
321
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 1395 if (buffer_needs_copy(s, frame, frame->buf[i]))
322 12 return 1;
323 426 return 0;
324 }
325
326 438 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
327 {
328 438 PadContext *s = inlink->dst->priv;
329 438 AVFilterLink *outlink = inlink->dst->outputs[0];
330 AVFrame *out;
331 int needs_copy;
332
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 438 if(s->eval_mode == EVAL_MODE_FRAME && (
333 ✗ in->width != s->inlink_w
334 ✗ || in->height != s->inlink_h
335 ✗ || in->format != outlink->format
336 ✗ || in->sample_aspect_ratio.den != outlink->sample_aspect_ratio.den || in->sample_aspect_ratio.num != outlink->sample_aspect_ratio.num)) {
337 int ret;
338
339 ✗ inlink->dst->inputs[0]->format = in->format;
340 ✗ inlink->dst->inputs[0]->w = in->width;
341 ✗ inlink->dst->inputs[0]->h = in->height;
342
343 ✗ inlink->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
344 ✗ inlink->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
345
346
347 ✗ if ((ret = config_input(inlink)) < 0) {
348 ✗ s->inlink_w = -1;
349 ✗ return ret;
350 }
351 ✗ if ((ret = config_output(outlink)) < 0) {
352 ✗ s->inlink_w = -1;
353 ✗ return ret;
354 }
355 }
356
357 438 needs_copy = frame_needs_copy(s, in);
358
359
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 438 if (needs_copy) {
360 12 av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
361 12 out = ff_get_video_buffer(outlink,
362 12 FFMAX(inlink->w, s->w),
363 12 FFMAX(inlink->h, s->h));
364
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 12 if (!out) {
365 ✗ av_frame_free(&in);
366 ✗ return AVERROR(ENOMEM);
367 }
368
369 12 av_frame_copy_props(out, in);
370 } else {
371 int i;
372
373 426 out = in;
374
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 1809 for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) {
375 1383 int hsub = s->draw.hsub[i];
376 1383 int vsub = s->draw.vsub[i];
377 1383 out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] +
378 1383 (s->y >> vsub) * out->linesize[i];
379 }
380 }
381
382 /* top bar */
383
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 438 if (s->y) {
384 438 ff_fill_rectangle(&s->draw, &s->color,
385 438 out->data, out->linesize,
386 0, 0, s->w, s->y);
387 }
388
389 /* bottom bar */
390
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 438 if (s->h > s->y + s->in_h) {
391 412 ff_fill_rectangle(&s->draw, &s->color,
392 412 out->data, out->linesize,
393 412 0, s->y + s->in_h, s->w, s->h - s->y - s->in_h);
394 }
395
396 /* left border */
397 438 ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
398 438 0, s->y, s->x, in->height);
399
400
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 438 if (needs_copy) {
401 12 ff_copy_rectangle2(&s->draw,
402 12 out->data, out->linesize, in->data, in->linesize,
403 12 s->x, s->y, 0, 0, in->width, in->height);
404 }
405
406 /* right border */
407 438 ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
408 438 s->x + s->in_w, s->y, s->w - s->x - s->in_w,
409 438 in->height);
410
411 438 out->width = s->w;
412 438 out->height = s->h;
413
414
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 438 if (in != out)
415 12 av_frame_free(&in);
416 438 return ff_filter_frame(outlink, out);
417 }
418
419 #define OFFSET(x) offsetof(PadContext, x)
420 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
421
422 static const AVOption pad_options[] = {
423 { "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
424 { "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
425 { "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
426 { "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
427 { "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
428 { "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
429 { "color", "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
430 { "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" },
431 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
432 { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
433 { "aspect", "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, DBL_MAX, FLAGS },
434 { NULL }
435 };
436
437 AVFILTER_DEFINE_CLASS(pad);
438
439 static const AVFilterPad avfilter_vf_pad_inputs[] = {
440 {
441 .name = "default",
442 .type = AVMEDIA_TYPE_VIDEO,
443 .config_props = config_input,
444 .get_buffer.video = get_video_buffer,
445 .filter_frame = filter_frame,
446 },
447 };
448
449 static const AVFilterPad avfilter_vf_pad_outputs[] = {
450 {
451 .name = "default",
452 .type = AVMEDIA_TYPE_VIDEO,
453 .config_props = config_output,
454 },
455 };
456
457 const AVFilter ff_vf_pad = {
458 .name = "pad",
459 .description = NULL_IF_CONFIG_SMALL("Pad the input video."),
460 .priv_size = sizeof(PadContext),
461 .priv_class = &pad_class,
462 FILTER_INPUTS(avfilter_vf_pad_inputs),
463 FILTER_OUTPUTS(avfilter_vf_pad_outputs),
464 FILTER_QUERY_FUNC2(query_formats),
465 };
466