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 void av_fill_image_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
28 const AVPixFmtDescriptor *pixdesc)
31 memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
32 if (max_pixstep_comps)
33 memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
35 for (i = 0; i < 4; i++) {
36 const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
37 if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) {
38 max_pixsteps[comp->plane] = comp->step_minus1+1;
39 if (max_pixstep_comps)
40 max_pixstep_comps[comp->plane] = i;
45 int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane)
47 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
48 int max_step [4]; /* max pixel step for each plane */
49 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
52 if (desc->flags & PIX_FMT_BITSTREAM)
53 return (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
55 av_fill_image_max_pixsteps(max_step, max_step_comp, desc);
56 s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0;
57 return max_step[plane] * (((width + (1 << s) - 1)) >> s);
60 int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
63 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
64 int max_step [4]; /* max pixel step for each plane */
65 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
67 memset(linesizes, 0, 4*sizeof(linesizes[0]));
69 if (desc->flags & PIX_FMT_HWACCEL)
70 return AVERROR(EINVAL);
72 if (desc->flags & PIX_FMT_BITSTREAM) {
73 linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
77 av_fill_image_max_pixsteps(max_step, max_step_comp, desc);
78 for (i = 0; i < 4; i++) {
79 int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
80 linesizes[i] = max_step[i] * (((width + (1 << s) - 1)) >> s);
86 int av_fill_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
87 uint8_t *ptr, const int linesizes[4])
89 int i, total_size, size[4], has_plane[4];
91 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
92 memset(data , 0, sizeof(data[0])*4);
93 memset(size , 0, sizeof(size));
94 memset(has_plane, 0, sizeof(has_plane));
96 if (desc->flags & PIX_FMT_HWACCEL)
97 return AVERROR(EINVAL);
100 size[0] = linesizes[0] * height;
102 if (desc->flags & PIX_FMT_PAL) {
103 size[0] = (size[0] + 3) & ~3;
104 data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
105 return size[0] + 256 * 4;
108 for (i = 0; i < 4; i++)
109 has_plane[desc->comp[i].plane] = 1;
111 total_size = size[0];
112 for (i = 1; has_plane[i] && i < 4; i++) {
113 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
114 data[i] = data[i-1] + size[i-1];
115 h = (height + (1 << s) - 1) >> s;
116 size[i] = h * linesizes[i];
117 total_size += size[i];
123 typedef struct ImgUtils {
124 const AVClass *class;
129 static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
131 int av_check_image_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
133 ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
135 if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
138 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
139 return AVERROR(EINVAL);