2 * This file is part of FFmpeg.
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.
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.
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
21 * misc image utilities
25 #include "libavutil/pixdesc.h"
27 int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
30 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
31 int max_step [4]; /* max pixel step for each plane */
32 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
34 memset(linesizes, 0, 4*sizeof(linesizes[0]));
36 if (desc->flags & PIX_FMT_HWACCEL)
37 return AVERROR(EINVAL);
39 if (desc->flags & PIX_FMT_BITSTREAM) {
40 linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
44 memset(max_step , 0, sizeof(max_step ));
45 memset(max_step_comp, 0, sizeof(max_step_comp));
46 for (i = 0; i < 4; i++) {
47 const AVComponentDescriptor *comp = &(desc->comp[i]);
48 if ((comp->step_minus1+1) > max_step[comp->plane]) {
49 max_step [comp->plane] = comp->step_minus1+1;
50 max_step_comp[comp->plane] = i;
54 for (i = 0; i < 4; i++) {
55 int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
56 linesizes[i] = max_step[i] * (((width + (1 << s) - 1)) >> s);
62 int av_fill_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
63 uint8_t *ptr, const int linesizes[4])
65 int i, total_size, size[4], has_plane[4];
67 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
68 memset(data , 0, sizeof(data[0])*4);
69 memset(size , 0, sizeof(size));
70 memset(has_plane, 0, sizeof(has_plane));
72 if (desc->flags & PIX_FMT_HWACCEL)
73 return AVERROR(EINVAL);
76 size[0] = linesizes[0] * height;
78 if (desc->flags & PIX_FMT_PAL) {
79 size[0] = (size[0] + 3) & ~3;
80 data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
81 return size[0] + 256 * 4;
84 for (i = 0; i < 4; i++)
85 has_plane[desc->comp[i].plane] = 1;
88 for (i = 1; has_plane[i] && i < 4; i++) {
89 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
90 data[i] = data[i-1] + size[i-1];
91 h = (height + (1 << s) - 1) >> s;
92 size[i] = h * linesizes[i];
93 total_size += size[i];
99 typedef struct ImgUtils {
100 const AVClass *class;
105 static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
107 int av_check_image_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
109 ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
111 if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
114 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
115 return AVERROR(EINVAL);