imgutils.c 8.6 KB

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