tonylight2016

ffmpeg 多客户端http服务

Nov 30th, 2020
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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.  * @file
  24.  * libavformat multi-client network API usage example.
  25.  *
  26.  * @example http_multiclient.c
  27.  * This example will serve a file without decoding or demuxing it over http.
  28.  * Multiple clients can connect and will receive the same file.
  29.  */
  30. #include <libavformat/avformat.h>
  31. #include <libavutil/opt.h>
  32. #include <unistd.h>
  33. static void process_client(AVIOContext *client, const char *in_uri)
  34. {
  35.     AVIOContext *input = NULL;
  36.     uint8_t buf[1024];
  37.     int ret, n, reply_code;
  38.     uint8_t *resource = NULL;
  39.     while ((ret = avio_handshake(client)) > 0) {
  40.         av_opt_get(client, "resource", AV_OPT_SEARCH_CHILDREN, &resource);
  41.         // check for strlen(resource) is necessary, because av_opt_get()
  42.         // may return empty string.
  43.         if (resource && strlen(resource))
  44.             break;
  45.         av_freep(&resource);
  46.     }
  47.     if (ret < 0)
  48.         goto end;
  49.     av_log(client, AV_LOG_TRACE, "resource=%p\n", resource);
  50.     if (resource && resource[0] == '/' && !strcmp((resource + 1), in_uri)) {
  51.         reply_code = 200;
  52.     } else {
  53.         reply_code = AVERROR_HTTP_NOT_FOUND;
  54.     }
  55.     if ((ret = av_opt_set_int(client, "reply_code", reply_code, AV_OPT_SEARCH_CHILDREN)) < 0) {
  56.         av_log(client, AV_LOG_ERROR, "Failed to set reply_code: %s.\n", av_err2str(ret));
  57.         goto end;
  58.     }
  59.     av_log(client, AV_LOG_TRACE, "Set reply code to %d\n", reply_code);
  60.     while ((ret = avio_handshake(client)) > 0);
  61.     if (ret < 0)
  62.         goto end;
  63.     fprintf(stderr, "Handshake performed.\n");
  64.     if (reply_code != 200)
  65.         goto end;
  66.     fprintf(stderr, "Opening input file.\n");
  67.     if ((ret = avio_open2(&input, in_uri, AVIO_FLAG_READ, NULL, NULL)) < 0) {
  68.         av_log(input, AV_LOG_ERROR, "Failed to open input: %s: %s.\n", in_uri,
  69.                av_err2str(ret));
  70.         goto end;
  71.     }
  72.     for(;;) {
  73.         n = avio_read(input, buf, sizeof(buf));
  74.         if (n < 0) {
  75.             if (n == AVERROR_EOF)
  76.                 break;
  77.             av_log(input, AV_LOG_ERROR, "Error reading from input: %s.\n",
  78.                    av_err2str(n));
  79.             break;
  80.         }
  81.         avio_write(client, buf, n);
  82.         avio_flush(client);
  83.     }
  84. end:
  85.     fprintf(stderr, "Flushing client\n");
  86.     avio_flush(client);
  87.     fprintf(stderr, "Closing client\n");
  88.     avio_close(client);
  89.     fprintf(stderr, "Closing input\n");
  90.     avio_close(input);
  91.     av_freep(&resource);
  92. }
  93. int main(int argc, char **argv)
  94. {
  95.     AVDictionary *options = NULL;
  96.     AVIOContext *client = NULL, *server = NULL;
  97.     const char *in_uri, *out_uri;
  98.     int ret, pid;
  99.     av_log_set_level(AV_LOG_TRACE);
  100.     if (argc < 3) {
  101.         printf("usage: %s input http://hostname[:port]\n"
  102.                "API example program to serve http to multiple clients.\n"
  103.                "\n", argv[0]);
  104.         return 1;
  105.     }
  106.     in_uri = argv[1];
  107.     out_uri = argv[2];
  108.     avformat_network_init();
  109.     if ((ret = av_dict_set(&options, "listen", "2", 0)) < 0) {
  110.         fprintf(stderr, "Failed to set listen mode for server: %s\n", av_err2str(ret));
  111.         return ret;
  112.     }
  113.     if ((ret = avio_open2(&server, out_uri, AVIO_FLAG_WRITE, NULL, &options)) < 0) {
  114.         fprintf(stderr, "Failed to open server: %s\n", av_err2str(ret));
  115.         return ret;
  116.     }
  117.     fprintf(stderr, "Entering main loop.\n");
  118.     for(;;) {
  119.         if ((ret = avio_accept(server, &client)) < 0)
  120.             goto end;
  121.         fprintf(stderr, "Accepted client, forking process.\n");
  122.         // XXX: Since we don't reap our children and don't ignore signals
  123.         //      this produces zombie processes.
  124.         pid = fork();
  125.         if (pid < 0) {
  126.             perror("Fork failed");
  127.             ret = AVERROR(errno);
  128.             goto end;
  129.         }
  130.         if (pid == 0) {
  131.             fprintf(stderr, "In child.\n");
  132.             process_client(client, in_uri);
  133.             avio_close(server);
  134.             exit(0);
  135.         }
  136.         if (pid > 0)
  137.             avio_close(client);
  138.     }
  139. end:
  140.     avio_close(server);
  141.     if (ret < 0 && ret != AVERROR_EOF) {
  142.         fprintf(stderr, "Some errors occurred: %s\n", av_err2str(ret));
  143.         return 1;
  144.     }
  145.     return 0;
  146. }
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