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  1. /*
  2.  * Session Announcement Protocol (RFC 2974) muxer
  3.  * Copyright (c) 2010 Martin Storsjo
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "avformat.h"
  23. #include "libavutil/parseutils.h"
  24. #include "libavutil/random_seed.h"
  25. #include "libavutil/avstring.h"
  26. #include "libavutil/dict.h"
  27. #include "libavutil/intreadwrite.h"
  28. #include "libavutil/time.h"
  29. #include "internal.h"
  30. #include "network.h"
  31. #include "os_support.h"
  32. #include "rtpenc_chain.h"
  33. #include "url.h"
  34.  
  35. struct SAPState {
  36.     uint8_t    *ann;
  37.     int         ann_size;
  38.     URLContext *ann_fd;
  39.     int64_t     last_time;
  40. };
  41.  
  42. static int sap_write_close(AVFormatContext *s)
  43. {
  44.     struct SAPState *sap = s->priv_data;
  45.     int i;
  46.  
  47.     for (i = 0; i < s->nb_streams; i++) {
  48.         AVFormatContext *rtpctx = s->streams[i]->priv_data;
  49.         if (!rtpctx)
  50.             continue;
  51.         av_write_trailer(rtpctx);
  52.         avio_closep(&rtpctx->pb);
  53.         avformat_free_context(rtpctx);
  54.         s->streams[i]->priv_data = NULL;
  55.     }
  56.  
  57.     if (sap->last_time && sap->ann && sap->ann_fd) {
  58.         sap->ann[0] |= 4; /* Session deletion*/
  59.         ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);
  60.     }
  61.  
  62.     av_freep(&sap->ann);
  63.     if (sap->ann_fd)
  64.         ffurl_close(sap->ann_fd);
  65.     ff_network_close();
  66.     return 0;
  67. }
  68.  
  69. static int sap_write_header(AVFormatContext *s)
  70. {
  71.     struct SAPState *sap = s->priv_data;
  72.     char host[1024], path[1024], url[1024], announce_addr[50] = "";
  73.     char *option_list;
  74.     int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255;
  75.     AVFormatContext **contexts = NULL;
  76.     int ret = 0;
  77.     struct sockaddr_storage localaddr;
  78.     socklen_t addrlen = sizeof(localaddr);
  79.     int udp_fd;
  80.     AVDictionaryEntry* title = av_dict_get(s->metadata, "title", NULL, 0);
  81.  
  82.     if (!ff_network_init())
  83.         return AVERROR(EIO);
  84.  
  85.     /* extract hostname and port */
  86.     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port,
  87.                  path, sizeof(path), s->filename);
  88.     if (base_port < 0)
  89.         base_port = 5004;
  90.  
  91.     /* search for options */
  92.     option_list = strrchr(path, '?');
  93.     if (option_list) {
  94.         char buf[50];
  95.         if (av_find_info_tag(buf, sizeof(buf), "announce_port", option_list)) {
  96.             port = strtol(buf, NULL, 10);
  97.         }
  98.         if (av_find_info_tag(buf, sizeof(buf), "same_port", option_list)) {
  99.             same_port = strtol(buf, NULL, 10);
  100.         }
  101.         if (av_find_info_tag(buf, sizeof(buf), "ttl", option_list)) {
  102.             ttl = strtol(buf, NULL, 10);
  103.         }
  104.         if (av_find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) {
  105.             av_strlcpy(announce_addr, buf, sizeof(announce_addr));
  106.         }
  107.     }
  108.  
  109.     if (!announce_addr[0]) {
  110.         struct addrinfo hints = { 0 }, *ai = NULL;
  111.         hints.ai_family = AF_UNSPEC;
  112.         if (getaddrinfo(host, NULL, &hints, &ai)) {
  113.             av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host);
  114.             ret = AVERROR(EIO);
  115.             goto fail;
  116.         }
  117.         if (ai->ai_family == AF_INET) {
  118.             /* Also known as sap.mcast.net */
  119.             av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr));
  120. #if HAVE_STRUCT_SOCKADDR_IN6
  121.         } else if (ai->ai_family == AF_INET6) {
  122.             /* With IPv6, you can use the same destination in many different
  123.              * multicast subnets, to choose how far you want it routed.
  124.              * This one is intended to be routed globally. */
  125.             av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr));
  126. #endif
  127.         } else {
  128.             freeaddrinfo(ai);
  129.             av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported "
  130.                                     "address family\n", host);
  131.             ret = AVERROR(EIO);
  132.             goto fail;
  133.         }
  134.         freeaddrinfo(ai);
  135.     }
  136.  
  137.     contexts = av_mallocz_array(s->nb_streams, sizeof(AVFormatContext*));
  138.     if (!contexts) {
  139.         ret = AVERROR(ENOMEM);
  140.         goto fail;
  141.     }
  142.  
  143.     if (s->start_time_realtime == 0  ||  s->start_time_realtime == AV_NOPTS_VALUE)
  144.         s->start_time_realtime = av_gettime();
  145.     for (i = 0; i < s->nb_streams; i++) {
  146.         URLContext *fd;
  147.  
  148.         ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port,
  149.                     "?ttl=%d", ttl);
  150.         if (!same_port)
  151.             base_port += 2;
  152.         ret = ffurl_open(&fd, url, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
  153.         if (ret) {
  154.             ret = AVERROR(EIO);
  155.             goto fail;
  156.         }
  157.         ret = ff_rtp_chain_mux_open(&contexts[i], s, s->streams[i], fd, 0, i);
  158.         if (ret < 0)
  159.             goto fail;
  160.         s->streams[i]->priv_data = contexts[i];
  161.         s->streams[i]->time_base = contexts[i]->streams[0]->time_base;
  162.         av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename));
  163.     }
  164.  
  165.     if (s->nb_streams > 0 && title)
  166.         av_dict_set(&contexts[0]->metadata, "title", title->value, 0);
  167.  
  168.     ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,
  169.                 "?ttl=%d&connect=1", ttl);
  170.     ret = ffurl_open(&sap->ann_fd, url, AVIO_FLAG_WRITE,
  171.                      &s->interrupt_callback, NULL);
  172.     if (ret) {
  173.         ret = AVERROR(EIO);
  174.         goto fail;
  175.     }
  176.  
  177.     udp_fd = ffurl_get_file_handle(sap->ann_fd);
  178.     if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) {
  179.         ret = AVERROR(EIO);
  180.         goto fail;
  181.     }
  182.     if (localaddr.ss_family != AF_INET
  183. #if HAVE_STRUCT_SOCKADDR_IN6
  184.         && localaddr.ss_family != AF_INET6
  185. #endif
  186.         ) {
  187.         av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n");
  188.         ret = AVERROR(EIO);
  189.         goto fail;
  190.     }
  191.     sap->ann_size = 8192;
  192.     sap->ann = av_mallocz(sap->ann_size);
  193.     if (!sap->ann) {
  194.         ret = AVERROR(EIO);
  195.         goto fail;
  196.     }
  197.     sap->ann[pos] = (1 << 5);
  198. #if HAVE_STRUCT_SOCKADDR_IN6
  199.     if (localaddr.ss_family == AF_INET6)
  200.         sap->ann[pos] |= 0x10;
  201. #endif
  202.     pos++;
  203.     sap->ann[pos++] = 0; /* Authentication length */
  204.     AV_WB16(&sap->ann[pos], av_get_random_seed());
  205.     pos += 2;
  206.     if (localaddr.ss_family == AF_INET) {
  207.         memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr,
  208.                sizeof(struct in_addr));
  209.         pos += sizeof(struct in_addr);
  210. #if HAVE_STRUCT_SOCKADDR_IN6
  211.     } else {
  212.         memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr,
  213.                sizeof(struct in6_addr));
  214.         pos += sizeof(struct in6_addr);
  215. #endif
  216.     }
  217.  
  218.     av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos);
  219.     pos += strlen(&sap->ann[pos]) + 1;
  220.  
  221.     if (av_sdp_create(contexts, s->nb_streams, &sap->ann[pos],
  222.                       sap->ann_size - pos)) {
  223.         ret = AVERROR_INVALIDDATA;
  224.         goto fail;
  225.     }
  226.     av_freep(&contexts);
  227.     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
  228.     pos += strlen(&sap->ann[pos]);
  229.     sap->ann_size = pos;
  230.  
  231.     if (sap->ann_size > sap->ann_fd->max_packet_size) {
  232.         av_log(s, AV_LOG_ERROR, "Announcement too large to send in one "
  233.                                 "packet\n");
  234.         goto fail;
  235.     }
  236.  
  237.     return 0;
  238.  
  239. fail:
  240.     av_free(contexts);
  241.     sap_write_close(s);
  242.     return ret;
  243. }
  244.  
  245. static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)
  246. {
  247.     AVFormatContext *rtpctx;
  248.     struct SAPState *sap = s->priv_data;
  249.     int64_t now = av_gettime_relative();
  250.  
  251.     if (!sap->last_time || now - sap->last_time > 5000000) {
  252.         int ret = ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);
  253.         /* Don't abort even if we get "Destination unreachable" */
  254.         if (ret < 0 && ret != AVERROR(ECONNREFUSED))
  255.             return ret;
  256.         sap->last_time = now;
  257.     }
  258.     rtpctx = s->streams[pkt->stream_index]->priv_data;
  259.     return ff_write_chained(rtpctx, 0, pkt, s, 0);
  260. }
  261.  
  262. AVOutputFormat ff_sap_muxer = {
  263.     .name              = "sap",
  264.     .long_name         = NULL_IF_CONFIG_SMALL("SAP output"),
  265.     .priv_data_size    = sizeof(struct SAPState),
  266.     .audio_codec       = AV_CODEC_ID_AAC,
  267.     .video_codec       = AV_CODEC_ID_MPEG4,
  268.     .write_header      = sap_write_header,
  269.     .write_packet      = sap_write_packet,
  270.     .write_trailer     = sap_write_close,
  271.     .flags             = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
  272. };
  273.