aboutsummaryrefslogtreecommitdiffstats
path: root/doc/examples/http_multiclient.c
blob: 831e89c60a496843fbe3b7f73122ea495728ff99 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*
 * Copyright (c) 2015 Stephan Holljes
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * @file
 * libavformat multi-client network API usage example.
 *
 * @example http_multiclient.c
 * This example will serve a file without decoding or demuxing it over http.
 * Multiple clients can connect and will receive the same file.
 */

#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include <unistd.h>

static void process_client(AVIOContext *client, const char *in_uri)
{
    AVIOContext *input = NULL;
    uint8_t buf[1024];
    int ret, n, reply_code;
    uint8_t *resource = NULL;
    while ((ret = avio_handshake(client)) > 0) {
        av_opt_get(client, "resource", AV_OPT_SEARCH_CHILDREN, &resource);
        // check for strlen(resource) is necessary, because av_opt_get()
        // may return empty string.
        if (resource && strlen(resource))
            break;
        av_freep(&resource);
    }
    if (ret < 0)
        goto end;
    av_log(client, AV_LOG_TRACE, "resource=%p\n", resource);
    if (resource && resource[0] == '/' && !strcmp((resource + 1), in_uri)) {
        reply_code = 200;
    } else {
        reply_code = AVERROR_HTTP_NOT_FOUND;
    }
    if ((ret = av_opt_set_int(client, "reply_code", reply_code, AV_OPT_SEARCH_CHILDREN)) < 0) {
        av_log(client, AV_LOG_ERROR, "Failed to set reply_code: %s.\n", av_err2str(ret));
        goto end;
    }
    av_log(client, AV_LOG_TRACE, "Set reply code to %d\n", reply_code);

    while ((ret = avio_handshake(client)) > 0);

    if (ret < 0)
        goto end;

    fprintf(stderr, "Handshake performed.\n");
    if (reply_code != 200)
        goto end;
    fprintf(stderr, "Opening input file.\n");
    if ((ret = avio_open2(&input, in_uri, AVIO_FLAG_READ, NULL, NULL)) < 0) {
        av_log(input, AV_LOG_ERROR, "Failed to open input: %s: %s.\n", in_uri,
               av_err2str(ret));
        goto end;
    }
    for(;;) {
        n = avio_read(input, buf, sizeof(buf));
        if (n < 0) {
            if (n == AVERROR_EOF)
                break;
            av_log(input, AV_LOG_ERROR, "Error reading from input: %s.\n",
                   av_err2str(n));
            break;
        }
        avio_write(client, buf, n);
        avio_flush(client);
    }
end:
    fprintf(stderr, "Flushing client\n");
    avio_flush(client);
    fprintf(stderr, "Closing client\n");
    avio_close(client);
    fprintf(stderr, "Closing input\n");
    avio_close(input);
    av_freep(&resource);
}

int main(int argc, char **argv)
{
    AVDictionary *options = NULL;
    AVIOContext *client = NULL, *server = NULL;
    const char *in_uri, *out_uri;
    int ret, pid;
    av_log_set_level(AV_LOG_TRACE);
    if (argc < 3) {
        printf("usage: %s input http://hostname[:port]\n"
               "API example program to serve http to multiple clients.\n"
               "\n", argv[0]);
        return 1;
    }

    in_uri = argv[1];
    out_uri = argv[2];

    avformat_network_init();

    if ((ret = av_dict_set(&options, "listen", "2", 0)) < 0) {
        fprintf(stderr, "Failed to set listen mode for server: %s\n", av_err2str(ret));
        return ret;
    }
    if ((ret = avio_open2(&server, out_uri, AVIO_FLAG_WRITE, NULL, &options)) < 0) {
        fprintf(stderr, "Failed to open server: %s\n", av_err2str(ret));
        return ret;
    }
    fprintf(stderr, "Entering main loop.\n");
    for(;;) {
        if ((ret = avio_accept(server, &client)) < 0)
            goto end;
        fprintf(stderr, "Accepted client, forking process.\n");
        // XXX: Since we don't reap our children and don't ignore signals
        //      this produces zombie processes.
        pid = fork();
        if (pid < 0) {
            perror("Fork failed");
            ret = AVERROR(errno);
            goto end;
        }
        if (pid == 0) {
            fprintf(stderr, "In child.\n");
            process_client(client, in_uri);
            avio_close(server);
            exit(0);
        }
        if (pid > 0)
            avio_close(client);
    }
end:
    avio_close(server);
    if (ret < 0 && ret != AVERROR_EOF) {
        fprintf(stderr, "Some errors occurred: %s\n", av_err2str(ret));
        return 1;
    }
    return 0;
}