| 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 "internal.h" |
| 28 | #include "intreadwrite.h" |
| 29 | #include "log.h" |
| 30 | #include "mathematics.h" |
| 31 | #include "pixdesc.h" |
| 32 | #include "rational.h" |
| 33 | |
| 34 | void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], |
| 35 | const AVPixFmtDescriptor *pixdesc) |
| 36 | { |
| 37 | int i; |
| 38 | memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0])); |
| 39 | if (max_pixstep_comps) |
| 40 | memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0])); |
| 41 | |
| 42 | for (i = 0; i < 4; i++) { |
| 43 | const AVComponentDescriptor *comp = &(pixdesc->comp[i]); |
| 44 | if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) { |
| 45 | max_pixsteps[comp->plane] = comp->step_minus1+1; |
| 46 | if (max_pixstep_comps) |
| 47 | max_pixstep_comps[comp->plane] = i; |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | static inline |
| 53 | int image_get_linesize(int width, int plane, |
| 54 | int max_step, int max_step_comp, |
| 55 | const AVPixFmtDescriptor *desc) |
| 56 | { |
| 57 | int s, shifted_w, linesize; |
| 58 | |
| 59 | if (!desc) |
| 60 | return AVERROR(EINVAL); |
| 61 | |
| 62 | if (width < 0) |
| 63 | return AVERROR(EINVAL); |
| 64 | s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0; |
| 65 | shifted_w = ((width + (1 << s) - 1)) >> s; |
| 66 | if (shifted_w && max_step > INT_MAX / shifted_w) |
| 67 | return AVERROR(EINVAL); |
| 68 | linesize = max_step * shifted_w; |
| 69 | |
| 70 | if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) |
| 71 | linesize = (linesize + 7) >> 3; |
| 72 | return linesize; |
| 73 | } |
| 74 | |
| 75 | int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane) |
| 76 | { |
| 77 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); |
| 78 | int max_step [4]; /* max pixel step for each plane */ |
| 79 | int max_step_comp[4]; /* the component for each plane which has the max pixel step */ |
| 80 | |
| 81 | if ((unsigned)pix_fmt >= AV_PIX_FMT_NB || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) |
| 82 | return AVERROR(EINVAL); |
| 83 | |
| 84 | av_image_fill_max_pixsteps(max_step, max_step_comp, desc); |
| 85 | return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc); |
| 86 | } |
| 87 | |
| 88 | int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width) |
| 89 | { |
| 90 | int i, ret; |
| 91 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); |
| 92 | int max_step [4]; /* max pixel step for each plane */ |
| 93 | int max_step_comp[4]; /* the component for each plane which has the max pixel step */ |
| 94 | |
| 95 | memset(linesizes, 0, 4*sizeof(linesizes[0])); |
| 96 | |
| 97 | if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) |
| 98 | return AVERROR(EINVAL); |
| 99 | |
| 100 | av_image_fill_max_pixsteps(max_step, max_step_comp, desc); |
| 101 | for (i = 0; i < 4; i++) { |
| 102 | if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0) |
| 103 | return ret; |
| 104 | linesizes[i] = ret; |
| 105 | } |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height, |
| 111 | uint8_t *ptr, const int linesizes[4]) |
| 112 | { |
| 113 | int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 }; |
| 114 | |
| 115 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); |
| 116 | memset(data , 0, sizeof(data[0])*4); |
| 117 | |
| 118 | if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) |
| 119 | return AVERROR(EINVAL); |
| 120 | |
| 121 | data[0] = ptr; |
| 122 | if (linesizes[0] > (INT_MAX - 1024) / height) |
| 123 | return AVERROR(EINVAL); |
| 124 | size[0] = linesizes[0] * height; |
| 125 | |
| 126 | if (desc->flags & AV_PIX_FMT_FLAG_PAL || |
| 127 | desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) { |
| 128 | size[0] = (size[0] + 3) & ~3; |
| 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 | |
| 152 | int 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 | |
| 192 | int 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 | |
| 222 | return ret; |
| 223 | } |
| 224 | |
| 225 | typedef struct ImgUtils { |
| 226 | const AVClass *class; |
| 227 | int log_offset; |
| 228 | void *log_ctx; |
| 229 | } ImgUtils; |
| 230 | |
| 231 | static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) }; |
| 232 | |
| 233 | int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx) |
| 234 | { |
| 235 | ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx }; |
| 236 | |
| 237 | if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8) |
| 238 | return 0; |
| 239 | |
| 240 | av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h); |
| 241 | return AVERROR(EINVAL); |
| 242 | } |
| 243 | |
| 244 | int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar) |
| 245 | { |
| 246 | int64_t scaled_dim; |
| 247 | |
| 248 | if (!sar.den) |
| 249 | return AVERROR(EINVAL); |
| 250 | |
| 251 | if (!sar.num || sar.num == sar.den) |
| 252 | return 0; |
| 253 | |
| 254 | if (sar.num < sar.den) |
| 255 | scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO); |
| 256 | else |
| 257 | scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO); |
| 258 | |
| 259 | if (scaled_dim > 0) |
| 260 | return 0; |
| 261 | |
| 262 | return AVERROR(EINVAL); |
| 263 | } |
| 264 | |
| 265 | void av_image_copy_plane(uint8_t *dst, int dst_linesize, |
| 266 | const uint8_t *src, int src_linesize, |
| 267 | int bytewidth, int height) |
| 268 | { |
| 269 | if (!dst || !src) |
| 270 | return; |
| 271 | av_assert0(abs(src_linesize) >= bytewidth); |
| 272 | av_assert0(abs(dst_linesize) >= bytewidth); |
| 273 | for (;height > 0; height--) { |
| 274 | memcpy(dst, src, bytewidth); |
| 275 | dst += dst_linesize; |
| 276 | src += src_linesize; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], |
| 281 | const uint8_t *src_data[4], const int src_linesizes[4], |
| 282 | enum AVPixelFormat pix_fmt, int width, int height) |
| 283 | { |
| 284 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); |
| 285 | |
| 286 | if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL) |
| 287 | return; |
| 288 | |
| 289 | if (desc->flags & AV_PIX_FMT_FLAG_PAL || |
| 290 | desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) { |
| 291 | av_image_copy_plane(dst_data[0], dst_linesizes[0], |
| 292 | src_data[0], src_linesizes[0], |
| 293 | width, height); |
| 294 | /* copy the palette */ |
| 295 | memcpy(dst_data[1], src_data[1], 4*256); |
| 296 | } else { |
| 297 | int i, planes_nb = 0; |
| 298 | |
| 299 | for (i = 0; i < desc->nb_components; i++) |
| 300 | planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1); |
| 301 | |
| 302 | for (i = 0; i < planes_nb; i++) { |
| 303 | int h = height; |
| 304 | int bwidth = av_image_get_linesize(pix_fmt, width, i); |
| 305 | if (bwidth < 0) { |
| 306 | av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n"); |
| 307 | return; |
| 308 | } |
| 309 | if (i == 1 || i == 2) { |
| 310 | h = FF_CEIL_RSHIFT(height, desc->log2_chroma_h); |
| 311 | } |
| 312 | av_image_copy_plane(dst_data[i], dst_linesizes[i], |
| 313 | src_data[i], src_linesizes[i], |
| 314 | bwidth, h); |
| 315 | } |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], |
| 320 | const uint8_t *src, |
| 321 | enum AVPixelFormat pix_fmt, int width, int height, int align) |
| 322 | { |
| 323 | int ret, i; |
| 324 | |
| 325 | if ((ret = av_image_check_size(width, height, 0, NULL)) < 0) |
| 326 | return ret; |
| 327 | |
| 328 | if ((ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width)) < 0) |
| 329 | return ret; |
| 330 | |
| 331 | for (i = 0; i < 4; i++) |
| 332 | dst_linesize[i] = FFALIGN(dst_linesize[i], align); |
| 333 | |
| 334 | return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize); |
| 335 | } |
| 336 | |
| 337 | int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align) |
| 338 | { |
| 339 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); |
| 340 | uint8_t *data[4]; |
| 341 | int linesize[4]; |
| 342 | |
| 343 | if (!desc) |
| 344 | return AVERROR(EINVAL); |
| 345 | if (av_image_check_size(width, height, 0, NULL) < 0) |
| 346 | return AVERROR(EINVAL); |
| 347 | if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) |
| 348 | // do not include palette for these pseudo-paletted formats |
| 349 | return width * height; |
| 350 | return av_image_fill_arrays(data, linesize, NULL, pix_fmt, width, height, align); |
| 351 | } |
| 352 | |
| 353 | int av_image_copy_to_buffer(uint8_t *dst, int dst_size, |
| 354 | const uint8_t * const src_data[4], const int src_linesize[4], |
| 355 | enum AVPixelFormat pix_fmt, int width, int height, int align) |
| 356 | { |
| 357 | int i, j, nb_planes = 0, linesize[4]; |
| 358 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); |
| 359 | int size = av_image_get_buffer_size(pix_fmt, width, height, align); |
| 360 | |
| 361 | if (size > dst_size || size < 0) |
| 362 | return AVERROR(EINVAL); |
| 363 | |
| 364 | for (i = 0; i < desc->nb_components; i++) |
| 365 | nb_planes = FFMAX(desc->comp[i].plane, nb_planes); |
| 366 | nb_planes++; |
| 367 | |
| 368 | av_image_fill_linesizes(linesize, pix_fmt, width); |
| 369 | for (i = 0; i < nb_planes; i++) { |
| 370 | int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0; |
| 371 | const uint8_t *src = src_data[i]; |
| 372 | h = (height + (1 << shift) - 1) >> shift; |
| 373 | |
| 374 | for (j = 0; j < h; j++) { |
| 375 | memcpy(dst, src, linesize[i]); |
| 376 | dst += FFALIGN(linesize[i], align); |
| 377 | src += src_linesize[i]; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | if (desc->flags & AV_PIX_FMT_FLAG_PAL) { |
| 382 | uint32_t *d32 = (uint32_t *)(((size_t)dst + 3) & ~3); |
| 383 | for (i = 0; i<256; i++) |
| 384 | AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i)); |
| 385 | } |
| 386 | |
| 387 | return size; |
| 388 | } |