1 /*
2 * Copyright (c) 2015 Stephan Holljes
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 multi-client network API usage example.
26 *
27 * @example http_multiclient.c
28 * This example will serve a file without decoding or demuxing it over http.
29 * Multiple clients can connect and will receive the same file.
30 */
31
32 #include <libavformat/avformat.h>
33 #include <libavutil/opt.h>
34 #include <unistd.h>
35
process_client(AVIOContext * client,const char * in_uri)36 static void process_client(AVIOContext *client, const char *in_uri)
37 {
38 AVIOContext *input = NULL;
39 uint8_t buf[1024];
40 int ret, n, reply_code;
41 uint8_t *resource = NULL;
42 while ((ret = avio_handshake(client)) > 0) {
43 av_opt_get(client, "resource", AV_OPT_SEARCH_CHILDREN, &resource);
44 // check for strlen(resource) is necessary, because av_opt_get()
45 // may return empty string.
46 if (resource && strlen(resource))
47 break;
48 av_freep(&resource);
49 }
50 if (ret < 0)
51 goto end;
52 av_log(client, AV_LOG_TRACE, "resource=%p\n", resource);
53 if (resource && resource[0] == '/' && !strcmp((resource + 1), in_uri)) {
54 reply_code = 200;
55 } else {
56 reply_code = AVERROR_HTTP_NOT_FOUND;
57 }
58 if ((ret = av_opt_set_int(client, "reply_code", reply_code, AV_OPT_SEARCH_CHILDREN)) < 0) {
59 av_log(client, AV_LOG_ERROR, "Failed to set reply_code: %s.\n", av_err2str(ret));
60 goto end;
61 }
62 av_log(client, AV_LOG_TRACE, "Set reply code to %d\n", reply_code);
63
64 while ((ret = avio_handshake(client)) > 0);
65
66 if (ret < 0)
67 goto end;
68
69 fprintf(stderr, "Handshake performed.\n");
70 if (reply_code != 200)
71 goto end;
72 fprintf(stderr, "Opening input file.\n");
73 if ((ret = avio_open2(&input, in_uri, AVIO_FLAG_READ, NULL, NULL)) < 0) {
74 av_log(input, AV_LOG_ERROR, "Failed to open input: %s: %s.\n", in_uri,
75 av_err2str(ret));
76 goto end;
77 }
78 for(;;) {
79 n = avio_read(input, buf, sizeof(buf));
80 if (n < 0) {
81 if (n == AVERROR_EOF)
82 break;
83 av_log(input, AV_LOG_ERROR, "Error reading from input: %s.\n",
84 av_err2str(n));
85 break;
86 }
87 avio_write(client, buf, n);
88 avio_flush(client);
89 }
90 end:
91 fprintf(stderr, "Flushing client\n");
92 avio_flush(client);
93 fprintf(stderr, "Closing client\n");
94 avio_close(client);
95 fprintf(stderr, "Closing input\n");
96 avio_close(input);
97 av_freep(&resource);
98 }
99
main(int argc,char ** argv)100 int main(int argc, char **argv)
101 {
102 AVDictionary *options = NULL;
103 AVIOContext *client = NULL, *server = NULL;
104 const char *in_uri, *out_uri;
105 int ret, pid;
106 av_log_set_level(AV_LOG_TRACE);
107 if (argc < 3) {
108 printf("usage: %s input http://hostname[:port]\n"
109 "API example program to serve http to multiple clients.\n"
110 "\n", argv[0]);
111 return 1;
112 }
113
114 in_uri = argv[1];
115 out_uri = argv[2];
116
117 avformat_network_init();
118
119 if ((ret = av_dict_set(&options, "listen", "2", 0)) < 0) {
120 fprintf(stderr, "Failed to set listen mode for server: %s\n", av_err2str(ret));
121 return ret;
122 }
123 if ((ret = avio_open2(&server, out_uri, AVIO_FLAG_WRITE, NULL, &options)) < 0) {
124 fprintf(stderr, "Failed to open server: %s\n", av_err2str(ret));
125 return ret;
126 }
127 fprintf(stderr, "Entering main loop.\n");
128 for(;;) {
129 if ((ret = avio_accept(server, &client)) < 0)
130 goto end;
131 fprintf(stderr, "Accepted client, forking process.\n");
132 // XXX: Since we don't reap our children and don't ignore signals
133 // this produces zombie processes.
134 pid = fork();
135 if (pid < 0) {
136 perror("Fork failed");
137 ret = AVERROR(errno);
138 goto end;
139 }
140 if (pid == 0) {
141 fprintf(stderr, "In child.\n");
142 process_client(client, in_uri);
143 avio_close(server);
144 exit(0);
145 }
146 if (pid > 0)
147 avio_close(client);
148 }
149 end:
150 avio_close(server);
151 if (ret < 0 && ret != AVERROR_EOF) {
152 fprintf(stderr, "Some errors occurred: %s\n", av_err2str(ret));
153 return 1;
154 }
155 return 0;
156 }
157