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path: root/libavutil/imgutils.c (plain)
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1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/**
20 * @file
21 * misc image utilities
22 */
23
24#include "avassert.h"
25#include "common.h"
26#include "imgutils.h"
27#include "imgutils_internal.h"
28#include "internal.h"
29#include "intreadwrite.h"
30#include "log.h"
31#include "mathematics.h"
32#include "pixdesc.h"
33#include "rational.h"
34
35void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
36 const AVPixFmtDescriptor *pixdesc)
37{
38 int i;
39 memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
40 if (max_pixstep_comps)
41 memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
42
43 for (i = 0; i < 4; i++) {
44 const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
45 if (comp->step > max_pixsteps[comp->plane]) {
46 max_pixsteps[comp->plane] = comp->step;
47 if (max_pixstep_comps)
48 max_pixstep_comps[comp->plane] = i;
49 }
50 }
51}
52
53static inline
54int image_get_linesize(int width, int plane,
55 int max_step, int max_step_comp,
56 const AVPixFmtDescriptor *desc)
57{
58 int s, shifted_w, linesize;
59
60 if (!desc)
61 return AVERROR(EINVAL);
62
63 if (width < 0)
64 return AVERROR(EINVAL);
65 s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0;
66 shifted_w = ((width + (1 << s) - 1)) >> s;
67 if (shifted_w && max_step > INT_MAX / shifted_w)
68 return AVERROR(EINVAL);
69 linesize = max_step * shifted_w;
70
71 if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)
72 linesize = (linesize + 7) >> 3;
73 return linesize;
74}
75
76int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
77{
78 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
79 int max_step [4]; /* max pixel step for each plane */
80 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
81
82 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
83 return AVERROR(EINVAL);
84
85 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
86 return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc);
87}
88
89int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
90{
91 int i, ret;
92 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
93 int max_step [4]; /* max pixel step for each plane */
94 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
95
96 memset(linesizes, 0, 4*sizeof(linesizes[0]));
97
98 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
99 return AVERROR(EINVAL);
100
101 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
102 for (i = 0; i < 4; i++) {
103 if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0)
104 return ret;
105 linesizes[i] = ret;
106 }
107
108 return 0;
109}
110
111int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
112 uint8_t *ptr, const int linesizes[4])
113{
114 int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 };
115
116 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
117 memset(data , 0, sizeof(data[0])*4);
118
119 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
120 return AVERROR(EINVAL);
121
122 data[0] = ptr;
123 if (linesizes[0] > (INT_MAX - 1024) / height)
124 return AVERROR(EINVAL);
125 size[0] = linesizes[0] * height;
126
127 if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
128 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
129 data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
130 return size[0] + 256 * 4;
131 }
132
133 for (i = 0; i < 4; i++)
134 has_plane[desc->comp[i].plane] = 1;
135
136 total_size = size[0];
137 for (i = 1; i < 4 && has_plane[i]; i++) {
138 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
139 data[i] = data[i-1] + size[i-1];
140 h = (height + (1 << s) - 1) >> s;
141 if (linesizes[i] > INT_MAX / h)
142 return AVERROR(EINVAL);
143 size[i] = h * linesizes[i];
144 if (total_size > INT_MAX - size[i])
145 return AVERROR(EINVAL);
146 total_size += size[i];
147 }
148
149 return total_size;
150}
151
152int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
153{
154 int i;
155
156 for (i = 0; i < 256; i++) {
157 int r, g, b;
158
159 switch (pix_fmt) {
160 case AV_PIX_FMT_RGB8:
161 r = (i>>5 )*36;
162 g = ((i>>2)&7)*36;
163 b = (i&3 )*85;
164 break;
165 case AV_PIX_FMT_BGR8:
166 b = (i>>6 )*85;
167 g = ((i>>3)&7)*36;
168 r = (i&7 )*36;
169 break;
170 case AV_PIX_FMT_RGB4_BYTE:
171 r = (i>>3 )*255;
172 g = ((i>>1)&3)*85;
173 b = (i&1 )*255;
174 break;
175 case AV_PIX_FMT_BGR4_BYTE:
176 b = (i>>3 )*255;
177 g = ((i>>1)&3)*85;
178 r = (i&1 )*255;
179 break;
180 case AV_PIX_FMT_GRAY8:
181 r = b = g = i;
182 break;
183 default:
184 return AVERROR(EINVAL);
185 }
186 pal[i] = b + (g << 8) + (r << 16) + (0xFFU << 24);
187 }
188
189 return 0;
190}
191
192int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
193 int w, int h, enum AVPixelFormat pix_fmt, int align)
194{
195 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
196 int i, ret;
197 uint8_t *buf;
198
199 if (!desc)
200 return AVERROR(EINVAL);
201
202 if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
203 return ret;
204 if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0)
205 return ret;
206
207 for (i = 0; i < 4; i++)
208 linesizes[i] = FFALIGN(linesizes[i], align);
209
210 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
211 return ret;
212 buf = av_malloc(ret + align);
213 if (!buf)
214 return AVERROR(ENOMEM);
215 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
216 av_free(buf);
217 return ret;
218 }
219 if (desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
220 avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
221 if (align < 4) {
222 av_log(NULL, AV_LOG_ERROR, "Formats with a palette require a minimum alignment of 4\n");
223 return AVERROR(EINVAL);
224 }
225 }
226
227 if ((desc->flags & AV_PIX_FMT_FLAG_PAL ||
228 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) &&
229 pointers[1] - pointers[0] > linesizes[0] * h) {
230 /* zero-initialize the padding before the palette */
231 memset(pointers[0] + linesizes[0] * h, 0,
232 pointers[1] - pointers[0] - linesizes[0] * h);
233 }
234
235 return ret;
236}
237
238typedef struct ImgUtils {
239 const AVClass *class;
240 int log_offset;
241 void *log_ctx;
242} ImgUtils;
243
244static const AVClass imgutils_class = {
245 .class_name = "IMGUTILS",
246 .item_name = av_default_item_name,
247 .version = LIBAVUTIL_VERSION_INT,
248 .log_level_offset_offset = offsetof(ImgUtils, log_offset),
249 .parent_log_context_offset = offsetof(ImgUtils, log_ctx),
250};
251
252int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
253{
254 ImgUtils imgutils = {
255 .class = &imgutils_class,
256 .log_offset = log_offset,
257 .log_ctx = log_ctx,
258 };
259 int64_t stride = av_image_get_linesize(pix_fmt, w, 0);
260 if (stride <= 0)
261 stride = 8LL*w;
262 stride += 128*8;
263
264 if ((int)w<=0 || (int)h<=0 || stride >= INT_MAX || stride*(uint64_t)(h+128) >= INT_MAX) {
265 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
266 return AVERROR(EINVAL);
267 }
268
269 if (max_pixels < INT64_MAX) {
270 if (w*(int64_t)h > max_pixels) {
271 av_log(&imgutils, AV_LOG_ERROR,
272 "Picture size %ux%u exceeds specified max pixel count %"PRId64", see the documentation if you wish to increase it\n",
273 w, h, max_pixels);
274 return AVERROR(EINVAL);
275 }
276 }
277
278 return 0;
279}
280
281int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
282{
283 return av_image_check_size2(w, h, INT64_MAX, AV_PIX_FMT_NONE, log_offset, log_ctx);
284}
285
286int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
287{
288 int64_t scaled_dim;
289
290 if (sar.den <= 0 || sar.num < 0)
291 return AVERROR(EINVAL);
292
293 if (!sar.num || sar.num == sar.den)
294 return 0;
295
296 if (sar.num < sar.den)
297 scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO);
298 else
299 scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO);
300
301 if (scaled_dim > 0)
302 return 0;
303
304 return AVERROR(EINVAL);
305}
306
307static void image_copy_plane(uint8_t *dst, ptrdiff_t dst_linesize,
308 const uint8_t *src, ptrdiff_t src_linesize,
309 ptrdiff_t bytewidth, int height)
310{
311 if (!dst || !src)
312 return;
313 av_assert0(abs(src_linesize) >= bytewidth);
314 av_assert0(abs(dst_linesize) >= bytewidth);
315 for (;height > 0; height--) {
316 memcpy(dst, src, bytewidth);
317 dst += dst_linesize;
318 src += src_linesize;
319 }
320}
321
322static void image_copy_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize,
323 const uint8_t *src, ptrdiff_t src_linesize,
324 ptrdiff_t bytewidth, int height)
325{
326 int ret = -1;
327
328#if ARCH_X86
329 ret = ff_image_copy_plane_uc_from_x86(dst, dst_linesize, src, src_linesize,
330 bytewidth, height);
331#endif
332
333 if (ret < 0)
334 image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
335}
336
337void av_image_copy_plane(uint8_t *dst, int dst_linesize,
338 const uint8_t *src, int src_linesize,
339 int bytewidth, int height)
340{
341 image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
342}
343
344static void image_copy(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4],
345 const uint8_t *src_data[4], const ptrdiff_t src_linesizes[4],
346 enum AVPixelFormat pix_fmt, int width, int height,
347 void (*copy_plane)(uint8_t *, ptrdiff_t, const uint8_t *,
348 ptrdiff_t, ptrdiff_t, int))
349{
350 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
351
352 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
353 return;
354
355 if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
356 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
357 copy_plane(dst_data[0], dst_linesizes[0],
358 src_data[0], src_linesizes[0],
359 width, height);
360 /* copy the palette */
361 memcpy(dst_data[1], src_data[1], 4*256);
362 } else {
363 int i, planes_nb = 0;
364
365 for (i = 0; i < desc->nb_components; i++)
366 planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
367
368 for (i = 0; i < planes_nb; i++) {
369 int h = height;
370 ptrdiff_t bwidth = av_image_get_linesize(pix_fmt, width, i);
371 if (bwidth < 0) {
372 av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n");
373 return;
374 }
375 if (i == 1 || i == 2) {
376 h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h);
377 }
378 copy_plane(dst_data[i], dst_linesizes[i],
379 src_data[i], src_linesizes[i],
380 bwidth, h);
381 }
382 }
383}
384
385void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
386 const uint8_t *src_data[4], const int src_linesizes[4],
387 enum AVPixelFormat pix_fmt, int width, int height)
388{
389 ptrdiff_t dst_linesizes1[4], src_linesizes1[4];
390 int i;
391
392 for (i = 0; i < 4; i++) {
393 dst_linesizes1[i] = dst_linesizes[i];
394 src_linesizes1[i] = src_linesizes[i];
395 }
396
397 image_copy(dst_data, dst_linesizes1, src_data, src_linesizes1, pix_fmt,
398 width, height, image_copy_plane);
399}
400
401void av_image_copy_uc_from(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4],
402 const uint8_t *src_data[4], const ptrdiff_t src_linesizes[4],
403 enum AVPixelFormat pix_fmt, int width, int height)
404{
405 image_copy(dst_data, dst_linesizes, src_data, src_linesizes, pix_fmt,
406 width, height, image_copy_plane_uc_from);
407}
408
409int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
410 const uint8_t *src, enum AVPixelFormat pix_fmt,
411 int width, int height, int align)
412{
413 int ret, i;
414
415 ret = av_image_check_size(width, height, 0, NULL);
416 if (ret < 0)
417 return ret;
418
419 ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width);
420 if (ret < 0)
421 return ret;
422
423 for (i = 0; i < 4; i++)
424 dst_linesize[i] = FFALIGN(dst_linesize[i], align);
425
426 return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize);
427}
428
429int av_image_get_buffer_size(enum AVPixelFormat pix_fmt,
430 int width, int height, int align)
431{
432 uint8_t *data[4];
433 int linesize[4];
434 int ret;
435 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
436 if (!desc)
437 return AVERROR(EINVAL);
438
439 ret = av_image_check_size(width, height, 0, NULL);
440 if (ret < 0)
441 return ret;
442
443 // do not include palette for these pseudo-paletted formats
444 if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
445 return FFALIGN(width, align) * height;
446
447 return av_image_fill_arrays(data, linesize, NULL, pix_fmt,
448 width, height, align);
449}
450
451int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
452 const uint8_t * const src_data[4],
453 const int src_linesize[4],
454 enum AVPixelFormat pix_fmt,
455 int width, int height, int align)
456{
457 int i, j, nb_planes = 0, linesize[4];
458 int size = av_image_get_buffer_size(pix_fmt, width, height, align);
459 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
460 int ret;
461
462 if (size > dst_size || size < 0 || !desc)
463 return AVERROR(EINVAL);
464
465 for (i = 0; i < desc->nb_components; i++)
466 nb_planes = FFMAX(desc->comp[i].plane, nb_planes);
467
468 nb_planes++;
469
470 ret = av_image_fill_linesizes(linesize, pix_fmt, width);
471 av_assert0(ret >= 0); // was checked previously
472
473 for (i = 0; i < nb_planes; i++) {
474 int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
475 const uint8_t *src = src_data[i];
476 h = (height + (1 << shift) - 1) >> shift;
477
478 for (j = 0; j < h; j++) {
479 memcpy(dst, src, linesize[i]);
480 dst += FFALIGN(linesize[i], align);
481 src += src_linesize[i];
482 }
483 }
484
485 if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
486 uint32_t *d32 = (uint32_t *)dst;
487
488 for (i = 0; i<256; i++)
489 AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i));
490 }
491
492 return size;
493}
494
generated by cgit at 2024-05-18 04:42:37 (GMT)