libavutil/detection_bbox.c

   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 #include "detection_bbox.h"
  20 #include "mem.h"
  21
  22 AVDetectionBBoxHeader *av_detection_bbox_alloc(uint32_t nb_bboxes, size_t *out_size)
  23 {
  24     size_t size;
  25     struct BBoxContext {
  26         AVDetectionBBoxHeader header;
  27         AVDetectionBBox boxes;
  28     };
  29     const size_t bboxes_offset = offsetof(struct BBoxContext, boxes);
  30     const size_t bbox_size = sizeof(AVDetectionBBox);
  31     AVDetectionBBoxHeader *header;
  32
  33     size = bboxes_offset;
  34     if (nb_bboxes > (SIZE_MAX - size) / bbox_size)
  35         return NULL;
  36     size += bbox_size * nb_bboxes;
  37
  38     header = av_mallocz(size);
  39     if (!header)
  40         return NULL;
  41
  42     header->nb_bboxes     = nb_bboxes;
  43     header->bbox_size     = bbox_size;
  44     header->bboxes_offset = bboxes_offset;
  45
  46     if (out_size)
  47         *out_size = size;
  48
  49     return header;
  50 }
  51
  52 AVDetectionBBoxHeader *av_detection_bbox_create_side_data(AVFrame *frame, uint32_t nb_bboxes)
  53 {
  54     AVBufferRef         *buf;
  55     AVDetectionBBoxHeader *header;
  56     size_t size;
  57
  58     header = av_detection_bbox_alloc(nb_bboxes, &size);
  59     if (!header)
  60         return NULL;
  61     buf = av_buffer_create((uint8_t *)header, size, NULL, NULL, 0);
  62     if (!buf) {
  63         av_freep(&header);
  64         return NULL;
  65     }
  66
  67     if (!av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_DETECTION_BBOXES, buf)) {
  68         av_buffer_unref(&buf);
  69         return NULL;
  70     }
  71
  72     return header;
  73 }