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  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.  
  36. 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.     char *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.     }
  49.     if (ret < 0)
  50.         goto end;
  51.     av_log(client, AV_LOG_TRACE, "resource=%p\n", resource);
  52.     if (resource && resource[0] == '/' && !strcmp((resource + 1), in_uri)) {
  53.         reply_code = 200;
  54.     } else {
  55.         reply_code = AVERROR_HTTP_NOT_FOUND;
  56.     }
  57.     if ((ret = av_opt_set_int(client, "reply_code", reply_code, AV_OPT_SEARCH_CHILDREN)) < 0) {
  58.         av_log(client, AV_LOG_ERROR, "Failed to set reply_code: %s.\n", av_err2str(ret));
  59.         goto end;
  60.     }
  61.     av_log(client, AV_LOG_TRACE, "Set reply code to %d\n", reply_code);
  62.  
  63.     while ((ret = avio_handshake(client)) > 0);
  64.  
  65.     if (ret < 0)
  66.         goto end;
  67.  
  68.     fprintf(stderr, "Handshake performed.\n");
  69.     if (reply_code != 200)
  70.         goto end;
  71.     fprintf(stderr, "Opening input file.\n");
  72.     if ((ret = avio_open2(&input, in_uri, AVIO_FLAG_READ, NULL, NULL)) < 0) {
  73.         av_log(input, AV_LOG_ERROR, "Failed to open input: %s: %s.\n", in_uri,
  74.                av_err2str(ret));
  75.         goto end;
  76.     }
  77.     for(;;) {
  78.         n = avio_read(input, buf, sizeof(buf));
  79.         if (n < 0) {
  80.             if (n == AVERROR_EOF)
  81.                 break;
  82.             av_log(input, AV_LOG_ERROR, "Error reading from input: %s.\n",
  83.                    av_err2str(n));
  84.             break;
  85.         }
  86.         avio_write(client, buf, n);
  87.         avio_flush(client);
  88.     }
  89. end:
  90.     fprintf(stderr, "Flushing client\n");
  91.     avio_flush(client);
  92.     fprintf(stderr, "Closing client\n");
  93.     avio_close(client);
  94.     fprintf(stderr, "Closing input\n");
  95.     avio_close(input);
  96. }
  97.  
  98. int main(int argc, char **argv)
  99. {
  100.     av_log_set_level(AV_LOG_TRACE);
  101.     AVDictionary *options = NULL;
  102.     AVIOContext *client = NULL, *server = NULL;
  103.     const char *in_uri, *out_uri;
  104.     int ret, pid;
  105.     if (argc < 3) {
  106.         printf("usage: %s input http://hostname[:port]\n"
  107.                "API example program to serve http to multiple clients.\n"
  108.                "\n", argv[0]);
  109.         return 1;
  110.     }
  111.  
  112.     in_uri = argv[1];
  113.     out_uri = argv[2];
  114.  
  115.     av_register_all();
  116.     avformat_network_init();
  117.  
  118.     if ((ret = av_dict_set(&options, "listen", "2", 0)) < 0) {
  119.         fprintf(stderr, "Failed to set listen mode for server: %s\n", av_err2str(ret));
  120.         return ret;
  121.     }
  122.     if ((ret = avio_open2(&server, out_uri, AVIO_FLAG_WRITE, NULL, &options)) < 0) {
  123.         fprintf(stderr, "Failed to open server: %s\n", av_err2str(ret));
  124.         return ret;
  125.     }
  126.     fprintf(stderr, "Entering main loop.\n");
  127.     for(;;) {
  128.         if ((ret = avio_accept(server, &client)) < 0)
  129.             goto end;
  130.         fprintf(stderr, "Accepted client, forking process.\n");
  131.         // XXX: Since we don't reap our children and don't ignore signals
  132.         //      this produces zombie processes.
  133.         pid = fork();
  134.         if (pid < 0) {
  135.             perror("Fork failed");
  136.             ret = AVERROR(errno);
  137.             goto end;
  138.         }
  139.         if (pid == 0) {
  140.             fprintf(stderr, "In child.\n");
  141.             process_client(client, in_uri);
  142.             avio_close(server);
  143.             exit(0);
  144.         }
  145.         if (pid > 0)
  146.             avio_close(client);
  147.     }
  148. end:
  149.     avio_close(server);
  150.     if (ret < 0 && ret != AVERROR_EOF) {
  151.         fprintf(stderr, "Some errors occurred: %s\n", av_err2str(ret));
  152.         return 1;
  153.     }
  154.     return 0;
  155. }
  156.