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25 * libavformat multi-client network API usage example.
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.
32 #include <libavformat/avformat.h>
33 #include <libavutil/opt.h>
36 static void process_client(AVIOContext *client, const char *in_uri)
38 AVIOContext *input = NULL;
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))
52 av_log(client, AV_LOG_TRACE, "resource=%p\n", resource);
53 if (resource && resource[0] == '/' && !strcmp((resource + 1), in_uri)) {
56 reply_code = AVERROR_HTTP_NOT_FOUND;
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));
62 av_log(client, AV_LOG_TRACE, "Set reply code to %d\n", reply_code);
64 while ((ret = avio_handshake(client)) > 0);
69 fprintf(stderr, "Handshake performed.\n");
70 if (reply_code != 200)
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,
79 n = avio_read(input, buf, sizeof(buf));
83 av_log(input, AV_LOG_ERROR, "Error reading from input: %s.\n",
87 avio_write(client, buf, n);
91 fprintf(stderr, "Flushing client\n");
93 fprintf(stderr, "Closing client\n");
95 fprintf(stderr, "Closing input\n");
100 int main(int argc, char **argv)
102 AVDictionary *options = NULL;
103 AVIOContext *client = NULL, *server = NULL;
104 const char *in_uri, *out_uri;
106 av_log_set_level(AV_LOG_TRACE);
108 printf("usage: %s input http://hostname[:port]\n"
109 "API example program to serve http to multiple clients.\n"
118 avformat_network_init();
120 if ((ret = av_dict_set(&options, "listen", "2", 0)) < 0) {
121 fprintf(stderr, "Failed to set listen mode for server: %s\n", av_err2str(ret));
124 if ((ret = avio_open2(&server, out_uri, AVIO_FLAG_WRITE, NULL, &options)) < 0) {
125 fprintf(stderr, "Failed to open server: %s\n", av_err2str(ret));
128 fprintf(stderr, "Entering main loop.\n");
130 if ((ret = avio_accept(server, &client)) < 0)
132 fprintf(stderr, "Accepted client, forking process.\n");
133 // XXX: Since we don't reap our children and don't ignore signals
134 // this produces zombie processes.
137 perror("Fork failed");
138 ret = AVERROR(errno);
142 fprintf(stderr, "In child.\n");
143 process_client(client, in_uri);
152 if (ret < 0 && ret != AVERROR_EOF) {
153 fprintf(stderr, "Some errors occurred: %s\n", av_err2str(ret));