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
42 static int read_packet(
void *opaque, uint8_t *buf,
int buf_size)
43 {
46
47 if (!buf_size)
50
51 /* copy internal buffer data to buf */
52 memcpy(buf, bd->
ptr, buf_size);
55
56 return buf_size;
57 }
58
59 int main(
int argc,
char *argv[])
60 {
64 size_t buffer_size, avio_ctx_buffer_size = 4096;
68
69 if (argc != 2) {
70 fprintf(stderr, "usage: %s input_file\n"
71 "API example program to show how to read from a custom buffer "
72 "accessed through AVIOContext.\n", argv[0]);
73 return 1;
74 }
76
77 /* slurp file content into buffer */
80 goto end;
81
82 /* fill opaque structure used by the AVIOContext read callback */
84 bd.
size = buffer_size;
85
88 goto end;
89 }
90
91 avio_ctx_buffer =
av_malloc(avio_ctx_buffer_size);
92 if (!avio_ctx_buffer) {
94 goto end;
95 }
98 if (!avio_ctx) {
100 goto end;
101 }
103
106 fprintf(stderr, "Could not open input\n");
107 goto end;
108 }
109
112 fprintf(stderr, "Could not find stream information\n");
113 goto end;
114 }
115
117
118 end:
120
121 /* note: the internal buffer could have changed, and be != avio_ctx_buffer */
122 if (avio_ctx)
125
127
130 return 1;
131 }
132
133 return 0;
134 }