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_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane)
29 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
30 int max_step [4]; /* max pixel step for each plane */
31 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
34 if (desc->flags & PIX_FMT_BITSTREAM)
35 return (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
37 memset(max_step , 0, sizeof(max_step ));
38 memset(max_step_comp, 0, sizeof(max_step_comp));
39 for (i = 0; i < 4; i++) {
40 const AVComponentDescriptor *comp = &(desc->comp[i]);
41 if ((comp->step_minus1+1) > max_step[comp->plane]) {
42 max_step [comp->plane] = comp->step_minus1+1;
43 max_step_comp[comp->plane] = i;
47 s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0;
48 return max_step[plane] * (((width + (1 << s) - 1)) >> s);
51 int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
54 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
55 int max_step [4]; /* max pixel step for each plane */
56 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
58 memset(linesizes, 0, 4*sizeof(linesizes[0]));
60 if (desc->flags & PIX_FMT_HWACCEL)
61 return AVERROR(EINVAL);
63 if (desc->flags & PIX_FMT_BITSTREAM) {
64 linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
68 memset(max_step , 0, sizeof(max_step ));
69 memset(max_step_comp, 0, sizeof(max_step_comp));
70 for (i = 0; i < 4; i++) {
71 const AVComponentDescriptor *comp = &(desc->comp[i]);
72 if ((comp->step_minus1+1) > max_step[comp->plane]) {
73 max_step [comp->plane] = comp->step_minus1+1;
74 max_step_comp[comp->plane] = i;
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);