imgutils.c 9.6 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306
  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. * @file
  20. * misc image utilities
  21. */
  22. #include "imgutils.h"
  23. #include "internal.h"
  24. #include "log.h"
  25. #include "pixdesc.h"
  26. void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
  27. const AVPixFmtDescriptor *pixdesc)
  28. {
  29. int i;
  30. memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
  31. if (max_pixstep_comps)
  32. memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
  33. for (i = 0; i < 4; i++) {
  34. const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
  35. if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) {
  36. max_pixsteps[comp->plane] = comp->step_minus1+1;
  37. if (max_pixstep_comps)
  38. max_pixstep_comps[comp->plane] = i;
  39. }
  40. }
  41. }
  42. static inline
  43. int image_get_linesize(int width, int plane,
  44. int max_step, int max_step_comp,
  45. const AVPixFmtDescriptor *desc)
  46. {
  47. int s, shifted_w, linesize;
  48. if (width < 0)
  49. return AVERROR(EINVAL);
  50. s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0;
  51. shifted_w = ((width + (1 << s) - 1)) >> s;
  52. if (shifted_w && max_step > INT_MAX / shifted_w)
  53. return AVERROR(EINVAL);
  54. linesize = max_step * shifted_w;
  55. if (desc->flags & PIX_FMT_BITSTREAM)
  56. linesize = (linesize + 7) >> 3;
  57. return linesize;
  58. }
  59. int av_image_get_linesize(enum PixelFormat pix_fmt, int width, int plane)
  60. {
  61. const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
  62. int max_step [4]; /* max pixel step for each plane */
  63. int max_step_comp[4]; /* the component for each plane which has the max pixel step */
  64. if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
  65. return AVERROR(EINVAL);
  66. av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
  67. return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc);
  68. }
  69. int av_image_fill_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
  70. {
  71. int i, ret;
  72. const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
  73. int max_step [4]; /* max pixel step for each plane */
  74. int max_step_comp[4]; /* the component for each plane which has the max pixel step */
  75. memset(linesizes, 0, 4*sizeof(linesizes[0]));
  76. if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
  77. return AVERROR(EINVAL);
  78. av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
  79. for (i = 0; i < 4; i++) {
  80. if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0)
  81. return ret;
  82. linesizes[i] = ret;
  83. }
  84. return 0;
  85. }
  86. int av_image_fill_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
  87. uint8_t *ptr, const int linesizes[4])
  88. {
  89. int i, total_size, size[4], has_plane[4];
  90. const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
  91. memset(data , 0, sizeof(data[0])*4);
  92. memset(size , 0, sizeof(size));
  93. memset(has_plane, 0, sizeof(has_plane));
  94. if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
  95. return AVERROR(EINVAL);
  96. data[0] = ptr;
  97. if (linesizes[0] > (INT_MAX - 1024) / height)
  98. return AVERROR(EINVAL);
  99. size[0] = linesizes[0] * height;
  100. if (desc->flags & PIX_FMT_PAL) {
  101. size[0] = (size[0] + 3) & ~3;
  102. data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
  103. return size[0] + 256 * 4;
  104. }
  105. for (i = 0; i < 4; i++)
  106. has_plane[desc->comp[i].plane] = 1;
  107. total_size = size[0];
  108. for (i = 1; i < 4 && has_plane[i]; i++) {
  109. int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
  110. data[i] = data[i-1] + size[i-1];
  111. h = (height + (1 << s) - 1) >> s;
  112. if (linesizes[i] > INT_MAX / h)
  113. return AVERROR(EINVAL);
  114. size[i] = h * linesizes[i];
  115. if (total_size > INT_MAX - size[i])
  116. return AVERROR(EINVAL);
  117. total_size += size[i];
  118. }
  119. return total_size;
  120. }
  121. int ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt)
  122. {
  123. int i;
  124. for (i = 0; i < 256; i++) {
  125. int r, g, b;
  126. switch (pix_fmt) {
  127. case PIX_FMT_RGB8:
  128. r = (i>>5 )*36;
  129. g = ((i>>2)&7)*36;
  130. b = (i&3 )*85;
  131. break;
  132. case PIX_FMT_BGR8:
  133. b = (i>>6 )*85;
  134. g = ((i>>3)&7)*36;
  135. r = (i&7 )*36;
  136. break;
  137. case PIX_FMT_RGB4_BYTE:
  138. r = (i>>3 )*255;
  139. g = ((i>>1)&3)*85;
  140. b = (i&1 )*255;
  141. break;
  142. case PIX_FMT_BGR4_BYTE:
  143. b = (i>>3 )*255;
  144. g = ((i>>1)&3)*85;
  145. r = (i&1 )*255;
  146. break;
  147. case PIX_FMT_GRAY8:
  148. r = b = g = i;
  149. break;
  150. default:
  151. return AVERROR(EINVAL);
  152. }
  153. pal[i] = b + (g<<8) + (r<<16);
  154. }
  155. return 0;
  156. }
  157. int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
  158. int w, int h, enum PixelFormat pix_fmt, int align)
  159. {
  160. int i, ret;
  161. uint8_t *buf;
  162. if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
  163. return ret;
  164. if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, w)) < 0)
  165. return ret;
  166. for (i = 0; i < 4; i++)
  167. linesizes[i] = FFALIGN(linesizes[i], align);
  168. if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
  169. return ret;
  170. buf = av_malloc(ret + align);
  171. if (!buf)
  172. return AVERROR(ENOMEM);
  173. if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
  174. av_free(buf);
  175. return ret;
  176. }
  177. if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PAL)
  178. ff_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
  179. return ret;
  180. }
  181. typedef struct ImgUtils {
  182. const AVClass *class;
  183. int log_offset;
  184. void *log_ctx;
  185. } ImgUtils;
  186. static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
  187. int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
  188. {
  189. ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
  190. if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
  191. return 0;
  192. av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
  193. return AVERROR(EINVAL);
  194. }
  195. void av_image_copy_plane(uint8_t *dst, int dst_linesize,
  196. const uint8_t *src, int src_linesize,
  197. int bytewidth, int height)
  198. {
  199. if (!dst || !src)
  200. return;
  201. for (;height > 0; height--) {
  202. memcpy(dst, src, bytewidth);
  203. dst += dst_linesize;
  204. src += src_linesize;
  205. }
  206. }
  207. void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
  208. const uint8_t *src_data[4], const int src_linesizes[4],
  209. enum PixelFormat pix_fmt, int width, int height)
  210. {
  211. const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
  212. if (desc->flags & PIX_FMT_HWACCEL)
  213. return;
  214. if (desc->flags & PIX_FMT_PAL) {
  215. av_image_copy_plane(dst_data[0], dst_linesizes[0],
  216. src_data[0], src_linesizes[0],
  217. width, height);
  218. /* copy the palette */
  219. memcpy(dst_data[1], src_data[1], 4*256);
  220. } else {
  221. int i, planes_nb = 0;
  222. for (i = 0; i < desc->nb_components; i++)
  223. planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
  224. for (i = 0; i < planes_nb; i++) {
  225. int h = height;
  226. int bwidth = av_image_get_linesize(pix_fmt, width, i);
  227. if (i == 1 || i == 2) {
  228. h= -((-height)>>desc->log2_chroma_h);
  229. }
  230. av_image_copy_plane(dst_data[i], dst_linesizes[i],
  231. src_data[i], src_linesizes[i],
  232. bwidth, h);
  233. }
  234. }
  235. }
  236. #if FF_API_OLD_IMAGE_NAMES
  237. void av_fill_image_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
  238. const AVPixFmtDescriptor *pixdesc)
  239. {
  240. av_image_fill_max_pixsteps(max_pixsteps, max_pixstep_comps, pixdesc);
  241. }
  242. int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane)
  243. {
  244. return av_image_get_linesize(pix_fmt, width, plane);
  245. }
  246. int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
  247. {
  248. return av_image_fill_linesizes(linesizes, pix_fmt, width);
  249. }
  250. int av_fill_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
  251. uint8_t *ptr, const int linesizes[4])
  252. {
  253. return av_image_fill_pointers(data, pix_fmt, height, ptr, linesizes);
  254. }
  255. int av_check_image_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
  256. {
  257. return av_image_check_size(w, h, log_offset, log_ctx);
  258. }
  259. #endif