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 <stddef.h>
20 #include <stdint.h>
21
22 #include "buffer.h"
23 #include "frame.h"
24 #include "mem.h"
25 #include "video_enc_params.h"
26
av_video_enc_params_alloc(enum AVVideoEncParamsType type,unsigned int nb_blocks,size_t * out_size)27 AVVideoEncParams *av_video_enc_params_alloc(enum AVVideoEncParamsType type,
28 unsigned int nb_blocks, size_t *out_size)
29 {
30 const size_t blocks_offset = offsetof(
31 struct {
32 AVVideoEncParams p;
33 AVVideoBlockParams b;
34 }, b);
35 size_t size = blocks_offset;
36 AVVideoEncParams *par;
37
38 if (nb_blocks > (SIZE_MAX - size) / sizeof(AVVideoBlockParams))
39 return NULL;
40 size += sizeof(AVVideoBlockParams) * nb_blocks;
41
42 par = av_mallocz(size);
43 if (!par)
44 return NULL;
45
46 par->type = type;
47 par->nb_blocks = nb_blocks;
48 par->block_size = sizeof(AVVideoBlockParams);
49 par->blocks_offset = blocks_offset;
50
51 if (out_size)
52 *out_size = size;
53
54 return par;
55 }
56
57 AVVideoEncParams*
av_video_enc_params_create_side_data(AVFrame * frame,enum AVVideoEncParamsType type,unsigned int nb_blocks)58 av_video_enc_params_create_side_data(AVFrame *frame, enum AVVideoEncParamsType type,
59 unsigned int nb_blocks)
60 {
61 AVBufferRef *buf;
62 AVVideoEncParams *par;
63 size_t size;
64
65 par = av_video_enc_params_alloc(type, nb_blocks, &size);
66 if (!par)
67 return NULL;
68 buf = av_buffer_create((uint8_t *)par, size, NULL, NULL, 0);
69 if (!buf) {
70 av_freep(&par);
71 return NULL;
72 }
73
74 if (!av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_VIDEO_ENC_PARAMS, buf)) {
75 av_buffer_unref(&buf);
76 return NULL;
77 }
78
79 return par;
80 }
81