1 /*
2 * Copyright (c) 2014 Stefano Sabatini
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 */
22
23 /**
24 * @file
25 * libavformat AVIOContext API example.
26 *
27 * Make libavformat demuxer access media content through a custom
28 * AVIOContext read callback.
29 * @example avio_reading.c
30 */
31
36
39 size_t size;
///< size left in the buffer
40 };
41
43 {
46
47 printf(
"ptr:%p size:%zu\n", bd->
ptr, bd->
size);
48
49 /* copy internal buffer data to buf */
50 memcpy(buf, bd->
ptr, buf_size);
53
54 return buf_size;
55 }
56
57 int main(
int argc,
char *argv[])
58 {
62 size_t buffer_size, avio_ctx_buffer_size = 4096;
66
67 if (argc != 2) {
68 fprintf(stderr, "usage: %s input_file\n"
69 "API example program to show how to read from a custom buffer "
70 "accessed through AVIOContext.\n", argv[0]);
71 return 1;
72 }
73 input_filename = argv[1];
74
75 /* register codecs and formats and other lavf/lavc components*/
77
78 /* slurp file content into buffer */
80 if (ret < 0)
82
83 /* fill opaque structure used by the AVIOContext read callback */
85 bd.
size = buffer_size;
86
90 }
91
92 avio_ctx_buffer =
av_malloc(avio_ctx_buffer_size);
93 if (!avio_ctx_buffer) {
96 }
99 if (!avio_ctx) {
102 }
103 fmt_ctx->
pb = avio_ctx;
104
106 if (ret < 0) {
107 fprintf(stderr, "Could not open input\n");
109 }
110
112 if (ret < 0) {
113 fprintf(stderr, "Could not find stream information\n");
115 }
116
118
121 /* note: the internal buffer could have changed, and be != avio_ctx_buffer */
122 if (avio_ctx) {
125 }
127
128 if (ret < 0) {
129 fprintf(stderr,
"Error occurred: %s\n",
av_err2str(ret));
130 return 1;
131 }
132
133 return 0;
134 }