imgutils.c (23329B)
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 "intreadwrite.h" 29 #include "log.h" 30 #include "mathematics.h" 31 #include "mem.h" 32 #include "pixdesc.h" 33 #include "rational.h" 34 35 void 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 53 static inline 54 int 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 76 int 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 89 int 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 } 110 111 int av_image_fill_plane_sizes(size_t sizes[4], enum AVPixelFormat pix_fmt, 112 int height, const ptrdiff_t linesizes[4]) 113 { 114 int i, has_plane[4] = { 0 }; 115 116 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); 117 memset(sizes , 0, sizeof(sizes[0])*4); 118 119 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) 120 return AVERROR(EINVAL); 121 122 if (linesizes[0] > SIZE_MAX / height) 123 return AVERROR(EINVAL); 124 sizes[0] = linesizes[0] * (size_t)height; 125 126 if (desc->flags & AV_PIX_FMT_FLAG_PAL) { 127 sizes[1] = 256 * 4; /* palette is stored here as 256 32 bits words */ 128 return 0; 129 } 130 131 for (i = 0; i < 4; i++) 132 has_plane[desc->comp[i].plane] = 1; 133 134 for (i = 1; i < 4 && has_plane[i]; i++) { 135 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0; 136 h = (height + (1 << s) - 1) >> s; 137 if (linesizes[i] > SIZE_MAX / h) 138 return AVERROR(EINVAL); 139 sizes[i] = (size_t)h * linesizes[i]; 140 } 141 142 return 0; 143 } 144 145 int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height, 146 uint8_t *ptr, const int linesizes[4]) 147 { 148 int i, ret; 149 ptrdiff_t linesizes1[4]; 150 size_t sizes[4]; 151 152 memset(data , 0, sizeof(data[0])*4); 153 154 for (i = 0; i < 4; i++) 155 linesizes1[i] = linesizes[i]; 156 157 ret = av_image_fill_plane_sizes(sizes, pix_fmt, height, linesizes1); 158 if (ret < 0) 159 return ret; 160 161 ret = 0; 162 for (i = 0; i < 4; i++) { 163 if (sizes[i] > INT_MAX - ret) 164 return AVERROR(EINVAL); 165 ret += sizes[i]; 166 } 167 168 if (!ptr) 169 return ret; 170 171 data[0] = ptr; 172 for (i = 1; i < 4 && sizes[i]; i++) 173 data[i] = data[i - 1] + sizes[i - 1]; 174 175 return ret; 176 } 177 178 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt) 179 { 180 int i; 181 182 for (i = 0; i < 256; i++) { 183 int r, g, b; 184 185 switch (pix_fmt) { 186 case AV_PIX_FMT_RGB8: 187 r = (i>>5 )*36; 188 g = ((i>>2)&7)*36; 189 b = (i&3 )*85; 190 break; 191 case AV_PIX_FMT_BGR8: 192 b = (i>>6 )*85; 193 g = ((i>>3)&7)*36; 194 r = (i&7 )*36; 195 break; 196 case AV_PIX_FMT_RGB4_BYTE: 197 r = (i>>3 )*255; 198 g = ((i>>1)&3)*85; 199 b = (i&1 )*255; 200 break; 201 case AV_PIX_FMT_BGR4_BYTE: 202 b = (i>>3 )*255; 203 g = ((i>>1)&3)*85; 204 r = (i&1 )*255; 205 break; 206 case AV_PIX_FMT_GRAY8: 207 r = b = g = i; 208 break; 209 default: 210 return AVERROR(EINVAL); 211 } 212 pal[i] = b + (g << 8) + (r << 16) + (0xFFU << 24); 213 } 214 215 return 0; 216 } 217 218 int av_image_alloc(uint8_t *pointers[4], int linesizes[4], 219 int w, int h, enum AVPixelFormat pix_fmt, int align) 220 { 221 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); 222 int i, ret; 223 ptrdiff_t linesizes1[4]; 224 size_t total_size, sizes[4]; 225 uint8_t *buf; 226 227 if (!desc) 228 return AVERROR(EINVAL); 229 230 if ((ret = av_image_check_size(w, h, 0, NULL)) < 0) 231 return ret; 232 if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0) 233 return ret; 234 235 for (i = 0; i < 4; i++) { 236 linesizes[i] = FFALIGN(linesizes[i], align); 237 linesizes1[i] = linesizes[i]; 238 } 239 240 if ((ret = av_image_fill_plane_sizes(sizes, pix_fmt, h, linesizes1)) < 0) 241 return ret; 242 total_size = align; 243 for (i = 0; i < 4; i++) { 244 if (total_size > SIZE_MAX - sizes[i]) 245 return AVERROR(EINVAL); 246 total_size += sizes[i]; 247 } 248 buf = av_malloc(total_size); 249 if (!buf) 250 return AVERROR(ENOMEM); 251 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) { 252 av_free(buf); 253 return ret; 254 } 255 if (desc->flags & AV_PIX_FMT_FLAG_PAL) { 256 avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt); 257 if (align < 4) { 258 av_log(NULL, AV_LOG_ERROR, "Formats with a palette require a minimum alignment of 4\n"); 259 av_free(buf); 260 return AVERROR(EINVAL); 261 } 262 } 263 264 if (desc->flags & AV_PIX_FMT_FLAG_PAL && pointers[1] && 265 pointers[1] - pointers[0] > linesizes[0] * h) { 266 /* zero-initialize the padding before the palette */ 267 memset(pointers[0] + linesizes[0] * h, 0, 268 pointers[1] - pointers[0] - linesizes[0] * h); 269 } 270 271 return ret; 272 } 273 274 typedef struct ImgUtils { 275 const AVClass *class; 276 int log_offset; 277 void *log_ctx; 278 } ImgUtils; 279 280 static const AVClass imgutils_class = { 281 .class_name = "IMGUTILS", 282 .item_name = av_default_item_name, 283 .option = NULL, 284 .version = LIBAVUTIL_VERSION_INT, 285 .log_level_offset_offset = offsetof(ImgUtils, log_offset), 286 .parent_log_context_offset = offsetof(ImgUtils, log_ctx), 287 }; 288 289 int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx) 290 { 291 ImgUtils imgutils = { 292 .class = &imgutils_class, 293 .log_offset = log_offset, 294 .log_ctx = log_ctx, 295 }; 296 int64_t stride = av_image_get_linesize(pix_fmt, w, 0); 297 if (stride <= 0) 298 stride = 8LL*w; 299 stride += 128*8; 300 301 if (w==0 || h==0 || w > INT32_MAX || h > INT32_MAX || stride >= INT_MAX || stride*(h + 128ULL) >= INT_MAX) { 302 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h); 303 return AVERROR(EINVAL); 304 } 305 306 if (max_pixels < INT64_MAX) { 307 if (w*(int64_t)h > max_pixels) { 308 av_log(&imgutils, AV_LOG_ERROR, 309 "Picture size %ux%u exceeds specified max pixel count %"PRId64", see the documentation if you wish to increase it\n", 310 w, h, max_pixels); 311 return AVERROR(EINVAL); 312 } 313 } 314 315 return 0; 316 } 317 318 int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx) 319 { 320 return av_image_check_size2(w, h, INT64_MAX, AV_PIX_FMT_NONE, log_offset, log_ctx); 321 } 322 323 int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar) 324 { 325 int64_t scaled_dim; 326 327 if (sar.den <= 0 || sar.num < 0) 328 return AVERROR(EINVAL); 329 330 if (!sar.num || sar.num == sar.den) 331 return 0; 332 333 if (sar.num < sar.den) 334 scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO); 335 else 336 scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO); 337 338 if (scaled_dim > 0) 339 return 0; 340 341 return AVERROR(EINVAL); 342 } 343 344 static void image_copy_plane(uint8_t *dst, ptrdiff_t dst_linesize, 345 const uint8_t *src, ptrdiff_t src_linesize, 346 ptrdiff_t bytewidth, int height) 347 { 348 if (!dst || !src) 349 return; 350 av_assert0(FFABS(src_linesize) >= bytewidth); 351 av_assert0(FFABS(dst_linesize) >= bytewidth); 352 for (;height > 0; height--) { 353 memcpy(dst, src, bytewidth); 354 dst += dst_linesize; 355 src += src_linesize; 356 } 357 } 358 359 void av_image_copy_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize, 360 const uint8_t *src, ptrdiff_t src_linesize, 361 ptrdiff_t bytewidth, int height) 362 { 363 int ret = -1; 364 365 #if ARCH_X86 366 ret = ff_image_copy_plane_uc_from_x86(dst, dst_linesize, src, src_linesize, 367 bytewidth, height); 368 #endif 369 370 if (ret < 0) 371 image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height); 372 } 373 374 void av_image_copy_plane(uint8_t *dst, int dst_linesize, 375 const uint8_t *src, int src_linesize, 376 int bytewidth, int height) 377 { 378 image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height); 379 } 380 381 static void image_copy(uint8_t *const dst_data[4], const ptrdiff_t dst_linesizes[4], 382 const uint8_t *const src_data[4], const ptrdiff_t src_linesizes[4], 383 enum AVPixelFormat pix_fmt, int width, int height, 384 void (*copy_plane)(uint8_t *, ptrdiff_t, const uint8_t *, 385 ptrdiff_t, ptrdiff_t, int)) 386 { 387 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); 388 389 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) 390 return; 391 392 if (desc->flags & AV_PIX_FMT_FLAG_PAL) { 393 copy_plane(dst_data[0], dst_linesizes[0], 394 src_data[0], src_linesizes[0], 395 width, height); 396 /* copy the palette */ 397 if ((desc->flags & AV_PIX_FMT_FLAG_PAL) || (dst_data[1] && src_data[1])) 398 memcpy(dst_data[1], src_data[1], 4*256); 399 } else { 400 int i, planes_nb = 0; 401 402 for (i = 0; i < desc->nb_components; i++) 403 planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1); 404 405 for (i = 0; i < planes_nb; i++) { 406 int h = height; 407 ptrdiff_t bwidth = av_image_get_linesize(pix_fmt, width, i); 408 if (bwidth < 0) { 409 av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n"); 410 return; 411 } 412 if (i == 1 || i == 2) { 413 h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h); 414 } 415 copy_plane(dst_data[i], dst_linesizes[i], 416 src_data[i], src_linesizes[i], 417 bwidth, h); 418 } 419 } 420 } 421 422 void av_image_copy(uint8_t *const dst_data[4], const int dst_linesizes[4], 423 const uint8_t * const src_data[4], const int src_linesizes[4], 424 enum AVPixelFormat pix_fmt, int width, int height) 425 { 426 ptrdiff_t dst_linesizes1[4], src_linesizes1[4]; 427 int i; 428 429 for (i = 0; i < 4; i++) { 430 dst_linesizes1[i] = dst_linesizes[i]; 431 src_linesizes1[i] = src_linesizes[i]; 432 } 433 434 image_copy(dst_data, dst_linesizes1, src_data, src_linesizes1, pix_fmt, 435 width, height, image_copy_plane); 436 } 437 438 void av_image_copy_uc_from(uint8_t * const dst_data[4], const ptrdiff_t dst_linesizes[4], 439 const uint8_t * const src_data[4], const ptrdiff_t src_linesizes[4], 440 enum AVPixelFormat pix_fmt, int width, int height) 441 { 442 image_copy(dst_data, dst_linesizes, src_data, src_linesizes, pix_fmt, 443 width, height, av_image_copy_plane_uc_from); 444 } 445 446 int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], 447 const uint8_t *src, enum AVPixelFormat pix_fmt, 448 int width, int height, int align) 449 { 450 int ret, i; 451 452 ret = av_image_check_size(width, height, 0, NULL); 453 if (ret < 0) 454 return ret; 455 456 ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width); 457 if (ret < 0) 458 return ret; 459 460 for (i = 0; i < 4; i++) 461 dst_linesize[i] = FFALIGN(dst_linesize[i], align); 462 463 return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize); 464 } 465 466 int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, 467 int width, int height, int align) 468 { 469 int ret, i; 470 int linesize[4]; 471 ptrdiff_t aligned_linesize[4]; 472 size_t sizes[4]; 473 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); 474 if (!desc) 475 return AVERROR(EINVAL); 476 477 ret = av_image_check_size(width, height, 0, NULL); 478 if (ret < 0) 479 return ret; 480 481 ret = av_image_fill_linesizes(linesize, pix_fmt, width); 482 if (ret < 0) 483 return ret; 484 485 for (i = 0; i < 4; i++) 486 aligned_linesize[i] = FFALIGN(linesize[i], align); 487 488 ret = av_image_fill_plane_sizes(sizes, pix_fmt, height, aligned_linesize); 489 if (ret < 0) 490 return ret; 491 492 ret = 0; 493 for (i = 0; i < 4; i++) { 494 if (sizes[i] > INT_MAX - ret) 495 return AVERROR(EINVAL); 496 ret += sizes[i]; 497 } 498 return ret; 499 } 500 501 int av_image_copy_to_buffer(uint8_t *dst, int dst_size, 502 const uint8_t * const src_data[4], 503 const int src_linesize[4], 504 enum AVPixelFormat pix_fmt, 505 int width, int height, int align) 506 { 507 int i, j, nb_planes = 0, linesize[4]; 508 int size = av_image_get_buffer_size(pix_fmt, width, height, align); 509 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); 510 int ret; 511 512 if (size > dst_size || size < 0 || !desc) 513 return AVERROR(EINVAL); 514 515 for (i = 0; i < desc->nb_components; i++) 516 nb_planes = FFMAX(desc->comp[i].plane, nb_planes); 517 518 nb_planes++; 519 520 ret = av_image_fill_linesizes(linesize, pix_fmt, width); 521 av_assert0(ret >= 0); // was checked previously 522 523 for (i = 0; i < nb_planes; i++) { 524 int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0; 525 const uint8_t *src = src_data[i]; 526 h = (height + (1 << shift) - 1) >> shift; 527 528 for (j = 0; j < h; j++) { 529 memcpy(dst, src, linesize[i]); 530 dst += FFALIGN(linesize[i], align); 531 src += src_linesize[i]; 532 } 533 } 534 535 if (desc->flags & AV_PIX_FMT_FLAG_PAL) { 536 uint32_t *d32 = (uint32_t *)dst; 537 538 for (i = 0; i<256; i++) 539 AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i)); 540 } 541 542 return size; 543 } 544 545 // Fill dst[0..dst_size] with the bytes in clear[0..clear_size]. The clear 546 // bytes are repeated until dst_size is reached. If dst_size is unaligned (i.e. 547 // dst_size%clear_size!=0), the remaining data will be filled with the beginning 548 // of the clear data only. 549 static void memset_bytes(uint8_t *dst, size_t dst_size, uint8_t *clear, 550 size_t clear_size) 551 { 552 int same = 1; 553 int i; 554 555 if (!clear_size) 556 return; 557 558 // Reduce to memset() if possible. 559 for (i = 0; i < clear_size; i++) { 560 if (clear[i] != clear[0]) { 561 same = 0; 562 break; 563 } 564 } 565 if (same) 566 clear_size = 1; 567 568 if (clear_size == 1) { 569 memset(dst, clear[0], dst_size); 570 } else { 571 if (clear_size > dst_size) 572 clear_size = dst_size; 573 memcpy(dst, clear, clear_size); 574 av_memcpy_backptr(dst + clear_size, clear_size, dst_size - clear_size); 575 } 576 } 577 578 // Maximum size in bytes of a plane element (usually a pixel, or multiple pixels 579 // if it's a subsampled packed format). 580 #define MAX_BLOCK_SIZE 32 581 582 int av_image_fill_color(uint8_t * const dst_data[4], const ptrdiff_t dst_linesize[4], 583 enum AVPixelFormat pix_fmt, const uint32_t color[4], 584 int width, int height, int flags) 585 { 586 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); 587 int nb_planes = av_pix_fmt_count_planes(pix_fmt); 588 // A pixel or a group of pixels on each plane, with a value that represents the color. 589 // Consider e.g. AV_PIX_FMT_UYVY422 for non-trivial cases. 590 uint8_t clear_block[4][MAX_BLOCK_SIZE] = {{0}}; // clear padding with 0 591 int clear_block_size[4] = {0}; 592 ptrdiff_t plane_line_bytes[4] = {0}; 593 int bitstream; 594 int plane, c; 595 596 if (!desc || nb_planes < 1 || nb_planes > 4 || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) 597 return AVERROR(EINVAL); 598 599 bitstream = !!(desc->flags & AV_PIX_FMT_FLAG_BITSTREAM); 600 601 for (c = 0; c < desc->nb_components; c++) { 602 const AVComponentDescriptor comp = desc->comp[c]; 603 604 // We try to operate on entire non-subsampled pixel groups (for 605 // AV_PIX_FMT_UYVY422 this would mean two consecutive pixels). 606 clear_block_size[comp.plane] = FFMAX(clear_block_size[comp.plane], comp.step); 607 608 if (clear_block_size[comp.plane] > MAX_BLOCK_SIZE) 609 return AVERROR(EINVAL); 610 } 611 612 // Create a byte array for clearing 1 pixel (sometimes several pixels). 613 for (c = 0; c < desc->nb_components; c++) { 614 const AVComponentDescriptor comp = desc->comp[c]; 615 // (Multiple pixels happen e.g. with AV_PIX_FMT_UYVY422.) 616 int w = (bitstream ? 8 : 1) * clear_block_size[comp.plane] / comp.step; 617 uint8_t *c_data[4]; 618 const int c_linesize[4] = {0}; 619 uint32_t src_array[MAX_BLOCK_SIZE]; 620 int x; 621 622 if (comp.depth > 32) 623 return AVERROR(EINVAL); 624 if (w < 1) 625 return AVERROR(EINVAL); 626 627 for (x = 0; x < w; x++) 628 src_array[x] = color[c]; 629 630 for (x = 0; x < 4; x++) 631 c_data[x] = &clear_block[x][0]; 632 633 av_write_image_line2(src_array, c_data, c_linesize, desc, 0, 0, c, w, 4); 634 } 635 636 for (plane = 0; plane < nb_planes; plane++) { 637 plane_line_bytes[plane] = av_image_get_linesize(pix_fmt, width, plane); 638 if (plane_line_bytes[plane] < 0) 639 return AVERROR(EINVAL); 640 } 641 642 if (!dst_data) 643 return 0; 644 645 for (plane = 0; plane < nb_planes; plane++) { 646 size_t bytewidth = plane_line_bytes[plane]; 647 uint8_t *data = dst_data[plane]; 648 int chroma_div = plane == 1 || plane == 2 ? desc->log2_chroma_h : 0; 649 int plane_h = ((height + ( 1 << chroma_div) - 1)) >> chroma_div; 650 651 for (; plane_h > 0; plane_h--) { 652 memset_bytes(data, bytewidth, &clear_block[plane][0], clear_block_size[plane]); 653 data += dst_linesize[plane]; 654 } 655 } 656 657 return 0; 658 } 659 660 int av_image_fill_black(uint8_t * const dst_data[4], const ptrdiff_t dst_linesize[4], 661 enum AVPixelFormat pix_fmt, enum AVColorRange range, 662 int width, int height) 663 { 664 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); 665 int nb_planes = av_pix_fmt_count_planes(pix_fmt); 666 int rgb, xyz, pal, limited, alpha, fltp; 667 uint32_t colors[4] = {0}; 668 669 if (!desc || nb_planes < 1 || nb_planes > 4 || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) 670 return AVERROR(EINVAL); 671 672 rgb = !!(desc->flags & AV_PIX_FMT_FLAG_RGB); 673 xyz = !!(desc->flags & AV_PIX_FMT_FLAG_XYZ); 674 pal = !!(desc->flags & AV_PIX_FMT_FLAG_PAL); 675 limited = !rgb && !xyz && !pal && range != AVCOL_RANGE_JPEG; 676 alpha = !pal && !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA); 677 fltp = !!(desc->flags & AV_PIX_FMT_FLAG_FLOAT); 678 679 for (int c = 0; c < desc->nb_components; c++) { 680 const AVComponentDescriptor comp = desc->comp[c]; 681 uint32_t color = 0; 682 683 if (comp.depth > 32) 684 return AVERROR(EINVAL); 685 686 if (pix_fmt == AV_PIX_FMT_MONOWHITE) { 687 color = 1; 688 } else if (c + 1 == desc->nb_components && alpha) { 689 // (Assume even limited YUV uses full range alpha.) 690 if (fltp) { 691 if (comp.depth != 16 && comp.depth != 32) 692 return AVERROR(EINVAL); 693 color = (comp.depth == 16 ? 0x3C00 : 0x3F800000); // 1.0 694 } else { 695 color = (comp.depth == 32 ? 0 : (1 << comp.depth)) - 1; 696 } 697 } else if (c == 0 && limited && comp.depth > 1) { 698 if (comp.depth < 8 || (fltp && comp.depth != 16 && comp.depth != 32)) 699 return AVERROR(EINVAL); 700 if (fltp) 701 color = (comp.depth == 16 ? 0x2C00 : 0x3D800000); // 0.0625 702 else 703 color = 16 << (comp.depth - 8); 704 } else if ((c == 1 || c == 2) && !rgb && !xyz) { 705 if (comp.depth < 8 || fltp && comp.depth != 16 && comp.depth != 32) 706 return AVERROR(EINVAL); 707 if (fltp) 708 color = (comp.depth == 16 ? 0x3800 : 0x3F000000); // 0.5 709 else 710 color = 128 << (comp.depth - 8); 711 } 712 713 colors[c] = color; 714 } 715 716 return av_image_fill_color(dst_data, dst_linesize, pix_fmt, colors, width, height, 0); 717 }