1/* 2 * This file is part of Libav. 3 * 4 * Libav 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 * Libav 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 Libav; 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 "imgutils.h" 25#include "internal.h" 26#include "log.h" 27#include "pixdesc.h" 28 29void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], 30 const AVPixFmtDescriptor *pixdesc) 31{ 32 int i; 33 memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0])); 34 if (max_pixstep_comps) 35 memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0])); 36 37 for (i = 0; i < 4; i++) { 38 const AVComponentDescriptor *comp = &(pixdesc->comp[i]); 39 if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) { 40 max_pixsteps[comp->plane] = comp->step_minus1+1; 41 if (max_pixstep_comps) 42 max_pixstep_comps[comp->plane] = i; 43 } 44 } 45} 46 47int av_image_get_linesize(enum PixelFormat pix_fmt, int width, int plane) 48{ 49 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; 50 int max_step [4]; /* max pixel step for each plane */ 51 int max_step_comp[4]; /* the component for each plane which has the max pixel step */ 52 int s; 53 54 if (desc->flags & PIX_FMT_BITSTREAM) 55 return (width * (desc->comp[0].step_minus1+1) + 7) >> 3; 56 57 av_image_fill_max_pixsteps(max_step, max_step_comp, desc); 58 s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0; 59 return max_step[plane] * (((width + (1 << s) - 1)) >> s); 60} 61 62int av_image_fill_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width) 63{ 64 int i; 65 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; 66 int max_step [4]; /* max pixel step for each plane */ 67 int max_step_comp[4]; /* the component for each plane which has the max pixel step */ 68 69 memset(linesizes, 0, 4*sizeof(linesizes[0])); 70 71 if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) 72 return AVERROR(EINVAL); 73 74 if (desc->flags & PIX_FMT_BITSTREAM) { 75 if (width > (INT_MAX -7) / (desc->comp[0].step_minus1+1)) 76 return AVERROR(EINVAL); 77 linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3; 78 return 0; 79 } 80 81 av_image_fill_max_pixsteps(max_step, max_step_comp, desc); 82 for (i = 0; i < 4; i++) { 83 int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0; 84 int shifted_w = ((width + (1 << s) - 1)) >> s; 85 if (max_step[i] > INT_MAX / shifted_w) 86 return AVERROR(EINVAL); 87 linesizes[i] = max_step[i] * shifted_w; 88 } 89 90 return 0; 91} 92 93int av_image_fill_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height, 94 uint8_t *ptr, const int linesizes[4]) 95{ 96 int i, total_size, size[4], has_plane[4]; 97 98 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; 99 memset(data , 0, sizeof(data[0])*4); 100 memset(size , 0, sizeof(size)); 101 memset(has_plane, 0, sizeof(has_plane)); 102 103 if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) 104 return AVERROR(EINVAL); 105 106 data[0] = ptr; 107 if (linesizes[0] > (INT_MAX - 1024) / height) 108 return AVERROR(EINVAL); 109 size[0] = linesizes[0] * height; 110 111 if (desc->flags & PIX_FMT_PAL) { 112 size[0] = (size[0] + 3) & ~3; 113 data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */ 114 return size[0] + 256 * 4; 115 } 116 117 for (i = 0; i < 4; i++) 118 has_plane[desc->comp[i].plane] = 1; 119 120 total_size = size[0]; 121 for (i = 1; i < 4 && has_plane[i]; i++) { 122 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0; 123 data[i] = data[i-1] + size[i-1]; 124 h = (height + (1 << s) - 1) >> s; 125 if (linesizes[i] > INT_MAX / h) 126 return AVERROR(EINVAL); 127 size[i] = h * linesizes[i]; 128 if (total_size > INT_MAX - size[i]) 129 return AVERROR(EINVAL); 130 total_size += size[i]; 131 } 132 133 return total_size; 134} 135 136int ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt) 137{ 138 int i; 139 140 for (i = 0; i < 256; i++) { 141 int r, g, b; 142 143 switch (pix_fmt) { 144 case PIX_FMT_RGB8: 145 r = (i>>5 )*36; 146 g = ((i>>2)&7)*36; 147 b = (i&3 )*85; 148 break; 149 case PIX_FMT_BGR8: 150 b = (i>>6 )*85; 151 g = ((i>>3)&7)*36; 152 r = (i&7 )*36; 153 break; 154 case PIX_FMT_RGB4_BYTE: 155 r = (i>>3 )*255; 156 g = ((i>>1)&3)*85; 157 b = (i&1 )*255; 158 break; 159 case PIX_FMT_BGR4_BYTE: 160 b = (i>>3 )*255; 161 g = ((i>>1)&3)*85; 162 r = (i&1 )*255; 163 break; 164 case PIX_FMT_GRAY8: 165 r = b = g = i; 166 break; 167 default: 168 return AVERROR(EINVAL); 169 } 170 pal[i] = b + (g<<8) + (r<<16); 171 } 172 173 return 0; 174} 175 176int av_image_alloc(uint8_t *pointers[4], int linesizes[4], 177 int w, int h, enum PixelFormat pix_fmt, int align) 178{ 179 int i, ret; 180 uint8_t *buf; 181 182 if ((ret = av_image_check_size(w, h, 0, NULL)) < 0) 183 return ret; 184 if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, w)) < 0) 185 return ret; 186 187 for (i = 0; i < 4; i++) 188 linesizes[i] = FFALIGN(linesizes[i], align); 189 190 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0) 191 return ret; 192 buf = av_malloc(ret + align); 193 if (!buf) 194 return AVERROR(ENOMEM); 195 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) { 196 av_free(buf); 197 return ret; 198 } 199 if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PAL) 200 ff_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt); 201 202 return ret; 203} 204 205typedef struct ImgUtils { 206 const AVClass *class; 207 int log_offset; 208 void *log_ctx; 209} ImgUtils; 210 211static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) }; 212 213int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx) 214{ 215 ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx }; 216 217 if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8) 218 return 0; 219 220 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h); 221 return AVERROR(EINVAL); 222} 223 224void av_image_copy_plane(uint8_t *dst, int dst_linesize, 225 const uint8_t *src, int src_linesize, 226 int bytewidth, int height) 227{ 228 if (!dst || !src) 229 return; 230 for (;height > 0; height--) { 231 memcpy(dst, src, bytewidth); 232 dst += dst_linesize; 233 src += src_linesize; 234 } 235} 236 237void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], 238 const uint8_t *src_data[4], const int src_linesizes[4], 239 enum PixelFormat pix_fmt, int width, int height) 240{ 241 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; 242 243 if (desc->flags & PIX_FMT_HWACCEL) 244 return; 245 246 if (desc->flags & PIX_FMT_PAL) { 247 av_image_copy_plane(dst_data[0], dst_linesizes[0], 248 src_data[0], src_linesizes[0], 249 width, height); 250 /* copy the palette */ 251 memcpy(dst_data[1], src_data[1], 4*256); 252 } else { 253 int i, planes_nb = 0; 254 255 for (i = 0; i < desc->nb_components; i++) 256 planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1); 257 258 for (i = 0; i < planes_nb; i++) { 259 int h = height; 260 int bwidth = av_image_get_linesize(pix_fmt, width, i); 261 if (i == 1 || i == 2) { 262 h= -((-height)>>desc->log2_chroma_h); 263 } 264 av_image_copy_plane(dst_data[i], dst_linesizes[i], 265 src_data[i], src_linesizes[i], 266 bwidth, h); 267 } 268 } 269} 270