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  1. /*
  2.  * RTSP demuxer
  3.  * Copyright (c) 2002 Fabrice Bellard
  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 "libavutil/avstring.h"
  23. #include "libavutil/intreadwrite.h"
  24. #include "libavutil/mathematics.h"
  25. #include "libavutil/random_seed.h"
  26. #include "libavutil/time.h"
  27. #include "avformat.h"
  28.  
  29. #include "internal.h"
  30. #include "network.h"
  31. #include "os_support.h"
  32. #include "rtpproto.h"
  33. #include "rtsp.h"
  34. #include "rdt.h"
  35. #include "tls.h"
  36. #include "url.h"
  37.  
  38. static const struct RTSPStatusMessage {
  39.     enum RTSPStatusCode code;
  40.     const char *message;
  41. } status_messages[] = {
  42.     { RTSP_STATUS_OK,             "OK"                               },
  43.     { RTSP_STATUS_METHOD,         "Method Not Allowed"               },
  44.     { RTSP_STATUS_BANDWIDTH,      "Not Enough Bandwidth"             },
  45.     { RTSP_STATUS_SESSION,        "Session Not Found"                },
  46.     { RTSP_STATUS_STATE,          "Method Not Valid in This State"   },
  47.     { RTSP_STATUS_AGGREGATE,      "Aggregate operation not allowed"  },
  48.     { RTSP_STATUS_ONLY_AGGREGATE, "Only aggregate operation allowed" },
  49.     { RTSP_STATUS_TRANSPORT,      "Unsupported transport"            },
  50.     { RTSP_STATUS_INTERNAL,       "Internal Server Error"            },
  51.     { RTSP_STATUS_SERVICE,        "Service Unavailable"              },
  52.     { RTSP_STATUS_VERSION,        "RTSP Version not supported"       },
  53.     { 0,                          "NULL"                             }
  54. };
  55.  
  56. static int rtsp_read_close(AVFormatContext *s)
  57. {
  58.     RTSPState *rt = s->priv_data;
  59.  
  60.     if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN))
  61.         ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
  62.  
  63.     ff_rtsp_close_streams(s);
  64.     ff_rtsp_close_connections(s);
  65.     ff_network_close();
  66.     rt->real_setup = NULL;
  67.     av_freep(&rt->real_setup_cache);
  68.     return 0;
  69. }
  70.  
  71. static inline int read_line(AVFormatContext *s, char *rbuf, const int rbufsize,
  72.                             int *rbuflen)
  73. {
  74.     RTSPState *rt = s->priv_data;
  75.     int idx       = 0;
  76.     int ret       = 0;
  77.     *rbuflen      = 0;
  78.  
  79.     do {
  80.         ret = ffurl_read_complete(rt->rtsp_hd, rbuf + idx, 1);
  81.         if (ret <= 0)
  82.             return ret ? ret : AVERROR_EOF;
  83.         if (rbuf[idx] == '\r') {
  84.             /* Ignore */
  85.         } else if (rbuf[idx] == '\n') {
  86.             rbuf[idx] = '\0';
  87.             *rbuflen  = idx;
  88.             return 0;
  89.         } else
  90.             idx++;
  91.     } while (idx < rbufsize);
  92.     av_log(s, AV_LOG_ERROR, "Message too long\n");
  93.     return AVERROR(EIO);
  94. }
  95.  
  96. static int rtsp_send_reply(AVFormatContext *s, enum RTSPStatusCode code,
  97.                            const char *extracontent, uint16_t seq)
  98. {
  99.     RTSPState *rt = s->priv_data;
  100.     char message[4096];
  101.     int index = 0;
  102.     while (status_messages[index].code) {
  103.         if (status_messages[index].code == code) {
  104.             snprintf(message, sizeof(message), "RTSP/1.0 %d %s\r\n",
  105.                      code, status_messages[index].message);
  106.             break;
  107.         }
  108.         index++;
  109.     }
  110.     if (!status_messages[index].code)
  111.         return AVERROR(EINVAL);
  112.     av_strlcatf(message, sizeof(message), "CSeq: %d\r\n", seq);
  113.     av_strlcatf(message, sizeof(message), "Server: %s\r\n", LIBAVFORMAT_IDENT);
  114.     if (extracontent)
  115.         av_strlcat(message, extracontent, sizeof(message));
  116.     av_strlcat(message, "\r\n", sizeof(message));
  117.     av_log(s, AV_LOG_TRACE, "Sending response:\n%s", message);
  118.     ffurl_write(rt->rtsp_hd_out, message, strlen(message));
  119.  
  120.     return 0;
  121. }
  122.  
  123. static inline int check_sessionid(AVFormatContext *s,
  124.                                   RTSPMessageHeader *request)
  125. {
  126.     RTSPState *rt = s->priv_data;
  127.     unsigned char *session_id = rt->session_id;
  128.     if (!session_id[0]) {
  129.         av_log(s, AV_LOG_WARNING, "There is no session-id at the moment\n");
  130.         return 0;
  131.     }
  132.     if (strcmp(session_id, request->session_id)) {
  133.         av_log(s, AV_LOG_ERROR, "Unexpected session-id %s\n",
  134.                request->session_id);
  135.         rtsp_send_reply(s, RTSP_STATUS_SESSION, NULL, request->seq);
  136.         return AVERROR_STREAM_NOT_FOUND;
  137.     }
  138.     return 0;
  139. }
  140.  
  141. static inline int rtsp_read_request(AVFormatContext *s,
  142.                                     RTSPMessageHeader *request,
  143.                                     const char *method)
  144. {
  145.     RTSPState *rt = s->priv_data;
  146.     char rbuf[1024];
  147.     int rbuflen, ret;
  148.     do {
  149.         ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
  150.         if (ret)
  151.             return ret;
  152.         if (rbuflen > 1) {
  153.             av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);
  154.             ff_rtsp_parse_line(request, rbuf, rt, method);
  155.         }
  156.     } while (rbuflen > 0);
  157.     if (request->seq != rt->seq + 1) {
  158.         av_log(s, AV_LOG_ERROR, "Unexpected Sequence number %d\n",
  159.                request->seq);
  160.         return AVERROR(EINVAL);
  161.     }
  162.     if (rt->session_id[0] && strcmp(method, "OPTIONS")) {
  163.         ret = check_sessionid(s, request);
  164.         if (ret)
  165.             return ret;
  166.     }
  167.  
  168.     return 0;
  169. }
  170.  
  171. static int rtsp_read_announce(AVFormatContext *s)
  172. {
  173.     RTSPState *rt             = s->priv_data;
  174.     RTSPMessageHeader request = { 0 };
  175.     char sdp[4096];
  176.     int  ret;
  177.  
  178.     ret = rtsp_read_request(s, &request, "ANNOUNCE");
  179.     if (ret)
  180.         return ret;
  181.     rt->seq++;
  182.     if (strcmp(request.content_type, "application/sdp")) {
  183.         av_log(s, AV_LOG_ERROR, "Unexpected content type %s\n",
  184.                request.content_type);
  185.         rtsp_send_reply(s, RTSP_STATUS_SERVICE, NULL, request.seq);
  186.         return AVERROR_OPTION_NOT_FOUND;
  187.     }
  188.     if (request.content_length && request.content_length < sizeof(sdp) - 1) {
  189.         /* Read SDP */
  190.         if (ffurl_read_complete(rt->rtsp_hd, sdp, request.content_length)
  191.             < request.content_length) {
  192.             av_log(s, AV_LOG_ERROR,
  193.                    "Unable to get complete SDP Description in ANNOUNCE\n");
  194.             rtsp_send_reply(s, RTSP_STATUS_INTERNAL, NULL, request.seq);
  195.             return AVERROR(EIO);
  196.         }
  197.         sdp[request.content_length] = '\0';
  198.         av_log(s, AV_LOG_VERBOSE, "SDP: %s\n", sdp);
  199.         ret = ff_sdp_parse(s, sdp);
  200.         if (ret)
  201.             return ret;
  202.         rtsp_send_reply(s, RTSP_STATUS_OK, NULL, request.seq);
  203.         return 0;
  204.     }
  205.     av_log(s, AV_LOG_ERROR,
  206.            "Content-Length header value exceeds sdp allocated buffer (4KB)\n");
  207.     rtsp_send_reply(s, RTSP_STATUS_INTERNAL,
  208.                     "Content-Length exceeds buffer size", request.seq);
  209.     return AVERROR(EIO);
  210. }
  211.  
  212. static int rtsp_read_options(AVFormatContext *s)
  213. {
  214.     RTSPState *rt             = s->priv_data;
  215.     RTSPMessageHeader request = { 0 };
  216.     int ret                   = 0;
  217.  
  218.     /* Parsing headers */
  219.     ret = rtsp_read_request(s, &request, "OPTIONS");
  220.     if (ret)
  221.         return ret;
  222.     rt->seq++;
  223.     /* Send Reply */
  224.     rtsp_send_reply(s, RTSP_STATUS_OK,
  225.                     "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, RECORD\r\n",
  226.                     request.seq);
  227.     return 0;
  228. }
  229.  
  230. static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
  231. {
  232.     RTSPState *rt             = s->priv_data;
  233.     RTSPMessageHeader request = { 0 };
  234.     int ret                   = 0;
  235.     char url[1024];
  236.     RTSPStream *rtsp_st;
  237.     char responseheaders[1024];
  238.     int localport    = -1;
  239.     int transportidx = 0;
  240.     int streamid     = 0;
  241.  
  242.     ret = rtsp_read_request(s, &request, "SETUP");
  243.     if (ret)
  244.         return ret;
  245.     rt->seq++;
  246.     if (!request.nb_transports) {
  247.         av_log(s, AV_LOG_ERROR, "No transport defined in SETUP\n");
  248.         return AVERROR_INVALIDDATA;
  249.     }
  250.     for (transportidx = 0; transportidx < request.nb_transports;
  251.          transportidx++) {
  252.         if (!request.transports[transportidx].mode_record ||
  253.             (request.transports[transportidx].lower_transport !=
  254.              RTSP_LOWER_TRANSPORT_UDP &&
  255.              request.transports[transportidx].lower_transport !=
  256.              RTSP_LOWER_TRANSPORT_TCP)) {
  257.             av_log(s, AV_LOG_ERROR, "mode=record/receive not set or transport"
  258.                    " protocol not supported (yet)\n");
  259.             return AVERROR_INVALIDDATA;
  260.         }
  261.     }
  262.     if (request.nb_transports > 1)
  263.         av_log(s, AV_LOG_WARNING, "More than one transport not supported, "
  264.                "using first of all\n");
  265.     for (streamid = 0; streamid < rt->nb_rtsp_streams; streamid++) {
  266.         if (!strcmp(rt->rtsp_streams[streamid]->control_url,
  267.                     controlurl))
  268.             break;
  269.     }
  270.     if (streamid == rt->nb_rtsp_streams) {
  271.         av_log(s, AV_LOG_ERROR, "Unable to find requested track\n");
  272.         return AVERROR_STREAM_NOT_FOUND;
  273.     }
  274.     rtsp_st   = rt->rtsp_streams[streamid];
  275.     localport = rt->rtp_port_min;
  276.  
  277.     if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
  278.         rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
  279.         if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
  280.             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
  281.             return ret;
  282.         }
  283.         rtsp_st->interleaved_min = request.transports[0].interleaved_min;
  284.         rtsp_st->interleaved_max = request.transports[0].interleaved_max;
  285.         snprintf(responseheaders, sizeof(responseheaders), "Transport: "
  286.                  "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d"
  287.                  "\r\n", request.transports[0].interleaved_min,
  288.                  request.transports[0].interleaved_max);
  289.     } else {
  290.         do {
  291.             AVDictionary *opts = NULL;
  292.             char buf[256];
  293.             snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
  294.             av_dict_set(&opts, "buffer_size", buf, 0);
  295.             ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
  296.             av_log(s, AV_LOG_TRACE, "Opening: %s", url);
  297.             ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
  298.                              &s->interrupt_callback, &opts);
  299.             av_dict_free(&opts);
  300.             if (ret)
  301.                 localport += 2;
  302.         } while (ret || localport > rt->rtp_port_max);
  303.         if (localport > rt->rtp_port_max) {
  304.             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
  305.             return ret;
  306.         }
  307.  
  308.         av_log(s, AV_LOG_TRACE, "Listening on: %d",
  309.                 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
  310.         if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
  311.             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
  312.             return ret;
  313.         }
  314.  
  315.         localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
  316.         snprintf(responseheaders, sizeof(responseheaders), "Transport: "
  317.                  "RTP/AVP/UDP;unicast;mode=receive;source=%s;"
  318.                  "client_port=%d-%d;server_port=%d-%d\r\n",
  319.                  host, request.transports[0].client_port_min,
  320.                  request.transports[0].client_port_max, localport,
  321.                  localport + 1);
  322.     }
  323.  
  324.     /* Establish sessionid if not previously set */
  325.     /* Put this in a function? */
  326.     /* RFC 2326: session id must be at least 8 digits */
  327.     while (strlen(rt->session_id) < 8)
  328.         av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
  329.  
  330.     av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
  331.                 rt->session_id);
  332.     /* Send Reply */
  333.     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
  334.  
  335.     rt->state = RTSP_STATE_PAUSED;
  336.     return 0;
  337. }
  338.  
  339. static int rtsp_read_record(AVFormatContext *s)
  340. {
  341.     RTSPState *rt             = s->priv_data;
  342.     RTSPMessageHeader request = { 0 };
  343.     int ret                   = 0;
  344.     char responseheaders[1024];
  345.  
  346.     ret = rtsp_read_request(s, &request, "RECORD");
  347.     if (ret)
  348.         return ret;
  349.     ret = check_sessionid(s, &request);
  350.     if (ret)
  351.         return ret;
  352.     rt->seq++;
  353.     snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
  354.              rt->session_id);
  355.     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
  356.  
  357.     rt->state = RTSP_STATE_STREAMING;
  358.     return 0;
  359. }
  360.  
  361. static inline int parse_command_line(AVFormatContext *s, const char *line,
  362.                                      int linelen, char *uri, int urisize,
  363.                                      char *method, int methodsize,
  364.                                      enum RTSPMethod *methodcode)
  365. {
  366.     RTSPState *rt = s->priv_data;
  367.     const char *linept, *searchlinept;
  368.     linept = strchr(line, ' ');
  369.  
  370.     if (!linept) {
  371.         av_log(s, AV_LOG_ERROR, "Error parsing method string\n");
  372.         return AVERROR_INVALIDDATA;
  373.     }
  374.  
  375.     if (linept - line > methodsize - 1) {
  376.         av_log(s, AV_LOG_ERROR, "Method string too long\n");
  377.         return AVERROR(EIO);
  378.     }
  379.     memcpy(method, line, linept - line);
  380.     method[linept - line] = '\0';
  381.     linept++;
  382.     if (!strcmp(method, "ANNOUNCE"))
  383.         *methodcode = ANNOUNCE;
  384.     else if (!strcmp(method, "OPTIONS"))
  385.         *methodcode = OPTIONS;
  386.     else if (!strcmp(method, "RECORD"))
  387.         *methodcode = RECORD;
  388.     else if (!strcmp(method, "SETUP"))
  389.         *methodcode = SETUP;
  390.     else if (!strcmp(method, "PAUSE"))
  391.         *methodcode = PAUSE;
  392.     else if (!strcmp(method, "TEARDOWN"))
  393.         *methodcode = TEARDOWN;
  394.     else
  395.         *methodcode = UNKNOWN;
  396.     /* Check method with the state  */
  397.     if (rt->state == RTSP_STATE_IDLE) {
  398.         if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
  399.             av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
  400.                    line);
  401.             return AVERROR_PROTOCOL_NOT_FOUND;
  402.         }
  403.     } else if (rt->state == RTSP_STATE_PAUSED) {
  404.         if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
  405.             && (*methodcode != SETUP)) {
  406.             av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
  407.                    line);
  408.             return AVERROR_PROTOCOL_NOT_FOUND;
  409.         }
  410.     } else if (rt->state == RTSP_STATE_STREAMING) {
  411.         if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
  412.             && (*methodcode != TEARDOWN)) {
  413.             av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
  414.                    " %s\n", line);
  415.             return AVERROR_PROTOCOL_NOT_FOUND;
  416.         }
  417.     } else {
  418.         av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
  419.         return AVERROR_BUG;
  420.     }
  421.  
  422.     searchlinept = strchr(linept, ' ');
  423.     if (!searchlinept) {
  424.         av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
  425.         return AVERROR_INVALIDDATA;
  426.     }
  427.     if (searchlinept - linept > urisize - 1) {
  428.         av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
  429.         return AVERROR(EIO);
  430.     }
  431.     memcpy(uri, linept, searchlinept - linept);
  432.     uri[searchlinept - linept] = '\0';
  433.     if (strcmp(rt->control_uri, uri)) {
  434.         char host[128], path[512], auth[128];
  435.         int port;
  436.         char ctl_host[128], ctl_path[512], ctl_auth[128];
  437.         int ctl_port;
  438.         av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
  439.                      path, sizeof(path), uri);
  440.         av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
  441.                      sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
  442.                      rt->control_uri);
  443.         if (strcmp(host, ctl_host))
  444.             av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
  445.                    host, ctl_host);
  446.         if (strcmp(path, ctl_path) && *methodcode != SETUP)
  447.             av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
  448.                    " %s\n", path, ctl_path);
  449.         if (*methodcode == ANNOUNCE) {
  450.             av_log(s, AV_LOG_INFO,
  451.                    "Updating control URI to %s\n", uri);
  452.             av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
  453.         }
  454.     }
  455.  
  456.     linept = searchlinept + 1;
  457.     if (!av_strstart(linept, "RTSP/1.0", NULL)) {
  458.         av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
  459.         return AVERROR_PROTOCOL_NOT_FOUND;
  460.     }
  461.     return 0;
  462. }
  463.  
  464. int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
  465. {
  466.     RTSPState *rt = s->priv_data;
  467.     unsigned char rbuf[4096];
  468.     unsigned char method[10];
  469.     char uri[500];
  470.     int ret;
  471.     int rbuflen               = 0;
  472.     RTSPMessageHeader request = { 0 };
  473.     enum RTSPMethod methodcode;
  474.  
  475.     ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
  476.     if (ret < 0)
  477.         return ret;
  478.     ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
  479.                              sizeof(method), &methodcode);
  480.     if (ret) {
  481.         av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
  482.         return ret;
  483.     }
  484.  
  485.     ret = rtsp_read_request(s, &request, method);
  486.     if (ret)
  487.         return ret;
  488.     rt->seq++;
  489.     if (methodcode == PAUSE) {
  490.         rt->state = RTSP_STATE_PAUSED;
  491.         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
  492.         // TODO: Missing date header in response
  493.     } else if (methodcode == OPTIONS) {
  494.         ret = rtsp_send_reply(s, RTSP_STATUS_OK,
  495.                               "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
  496.                               "RECORD\r\n", request.seq);
  497.     } else if (methodcode == TEARDOWN) {
  498.         rt->state = RTSP_STATE_IDLE;
  499.         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
  500.         return 0;
  501.     }
  502.     return ret;
  503. }
  504.  
  505. static int rtsp_read_play(AVFormatContext *s)
  506. {
  507.     RTSPState *rt = s->priv_data;
  508.     RTSPMessageHeader reply1, *reply = &reply1;
  509.     int i;
  510.     char cmd[1024];
  511.  
  512.     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
  513.     rt->nb_byes = 0;
  514.  
  515.     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
  516.         for (i = 0; i < rt->nb_rtsp_streams; i++) {
  517.             RTSPStream *rtsp_st = rt->rtsp_streams[i];
  518.             /* Try to initialize the connection state in a
  519.              * potential NAT router by sending dummy packets.
  520.              * RTP/RTCP dummy packets are used for RDT, too.
  521.              */
  522.             if (rtsp_st->rtp_handle &&
  523.                 !(rt->server_type == RTSP_SERVER_WMS && i > 1))
  524.                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
  525.         }
  526.     }
  527.     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
  528.         if (rt->transport == RTSP_TRANSPORT_RTP) {
  529.             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  530.                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  531.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  532.                 if (!rtpctx)
  533.                     continue;
  534.                 ff_rtp_reset_packet_queue(rtpctx);
  535.                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
  536.                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
  537.                 rtpctx->base_timestamp      = 0;
  538.                 rtpctx->timestamp           = 0;
  539.                 rtpctx->unwrapped_timestamp = 0;
  540.                 rtpctx->rtcp_ts_offset      = 0;
  541.             }
  542.         }
  543.         if (rt->state == RTSP_STATE_PAUSED) {
  544.             cmd[0] = 0;
  545.         } else {
  546.             snprintf(cmd, sizeof(cmd),
  547.                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
  548.                      rt->seek_timestamp / AV_TIME_BASE,
  549.                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
  550.         }
  551.         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
  552.         if (reply->status_code != RTSP_STATUS_OK) {
  553.             return ff_rtsp_averror(reply->status_code, -1);
  554.         }
  555.         if (rt->transport == RTSP_TRANSPORT_RTP &&
  556.             reply->range_start != AV_NOPTS_VALUE) {
  557.             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  558.                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  559.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  560.                 AVStream *st = NULL;
  561.                 if (!rtpctx || rtsp_st->stream_index < 0)
  562.                     continue;
  563.  
  564.                 st = s->streams[rtsp_st->stream_index];
  565.                 rtpctx->range_start_offset =
  566.                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
  567.                                  st->time_base);
  568.             }
  569.         }
  570.     }
  571.     rt->state = RTSP_STATE_STREAMING;
  572.     return 0;
  573. }
  574.  
  575. /* pause the stream */
  576. static int rtsp_read_pause(AVFormatContext *s)
  577. {
  578.     RTSPState *rt = s->priv_data;
  579.     RTSPMessageHeader reply1, *reply = &reply1;
  580.  
  581.     if (rt->state != RTSP_STATE_STREAMING)
  582.         return 0;
  583.     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
  584.         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
  585.         if (reply->status_code != RTSP_STATUS_OK) {
  586.             return ff_rtsp_averror(reply->status_code, -1);
  587.         }
  588.     }
  589.     rt->state = RTSP_STATE_PAUSED;
  590.     return 0;
  591. }
  592.  
  593. int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
  594. {
  595.     RTSPState *rt = s->priv_data;
  596.     char cmd[1024];
  597.     unsigned char *content = NULL;
  598.     int ret;
  599.  
  600.     /* describe the stream */
  601.     snprintf(cmd, sizeof(cmd),
  602.              "Accept: application/sdp\r\n");
  603.     if (rt->server_type == RTSP_SERVER_REAL) {
  604.         /**
  605.          * The Require: attribute is needed for proper streaming from
  606.          * Realmedia servers.
  607.          */
  608.         av_strlcat(cmd,
  609.                    "Require: com.real.retain-entity-for-setup\r\n",
  610.                    sizeof(cmd));
  611.     }
  612.     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
  613.     if (reply->status_code != RTSP_STATUS_OK) {
  614.         av_freep(&content);
  615.         return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
  616.     }
  617.     if (!content)
  618.         return AVERROR_INVALIDDATA;
  619.  
  620.     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
  621.     /* now we got the SDP description, we parse it */
  622.     ret = ff_sdp_parse(s, (const char *)content);
  623.     av_freep(&content);
  624.     if (ret < 0)
  625.         return ret;
  626.  
  627.     return 0;
  628. }
  629.  
  630. static int rtsp_listen(AVFormatContext *s)
  631. {
  632.     RTSPState *rt = s->priv_data;
  633.     char proto[128], host[128], path[512], auth[128];
  634.     char uri[500];
  635.     int port;
  636.     int default_port = RTSP_DEFAULT_PORT;
  637.     char tcpname[500];
  638.     const char *lower_proto = "tcp";
  639.     unsigned char rbuf[4096];
  640.     unsigned char method[10];
  641.     int rbuflen = 0;
  642.     int ret;
  643.     enum RTSPMethod methodcode;
  644.  
  645.     /* extract hostname and port */
  646.     av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
  647.                  &port, path, sizeof(path), s->filename);
  648.  
  649.     /* ff_url_join. No authorization by now (NULL) */
  650.     ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
  651.                 port, "%s", path);
  652.  
  653.     if (!strcmp(proto, "rtsps")) {
  654.         lower_proto  = "tls";
  655.         default_port = RTSPS_DEFAULT_PORT;
  656.     }
  657.  
  658.     if (port < 0)
  659.         port = default_port;
  660.  
  661.     /* Create TCP connection */
  662.     ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,
  663.                 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
  664.  
  665.     if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
  666.                          &s->interrupt_callback, NULL)) {
  667.         av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
  668.         return ret;
  669.     }
  670.     rt->state       = RTSP_STATE_IDLE;
  671.     rt->rtsp_hd_out = rt->rtsp_hd;
  672.     for (;;) { /* Wait for incoming RTSP messages */
  673.         ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
  674.         if (ret < 0)
  675.             return ret;
  676.         ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
  677.                                  sizeof(method), &methodcode);
  678.         if (ret) {
  679.             av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
  680.             return ret;
  681.         }
  682.  
  683.         if (methodcode == ANNOUNCE) {
  684.             ret       = rtsp_read_announce(s);
  685.             rt->state = RTSP_STATE_PAUSED;
  686.         } else if (methodcode == OPTIONS) {
  687.             ret = rtsp_read_options(s);
  688.         } else if (methodcode == RECORD) {
  689.             ret = rtsp_read_record(s);
  690.             if (!ret)
  691.                 return 0; // We are ready for streaming
  692.         } else if (methodcode == SETUP)
  693.             ret = rtsp_read_setup(s, host, uri);
  694.         if (ret) {
  695.             ffurl_close(rt->rtsp_hd);
  696.             return AVERROR_INVALIDDATA;
  697.         }
  698.     }
  699.     return 0;
  700. }
  701.  
  702. static int rtsp_probe(AVProbeData *p)
  703. {
  704.     if (
  705. #if CONFIG_TLS_PROTOCOL
  706.         av_strstart(p->filename, "rtsps:", NULL) ||
  707. #endif
  708.         av_strstart(p->filename, "rtsp:", NULL))
  709.         return AVPROBE_SCORE_MAX;
  710.     return 0;
  711. }
  712.  
  713. static int rtsp_read_header(AVFormatContext *s)
  714. {
  715.     RTSPState *rt = s->priv_data;
  716.     int ret;
  717.  
  718.     if (rt->initial_timeout > 0)
  719.         rt->rtsp_flags |= RTSP_FLAG_LISTEN;
  720.  
  721.     if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
  722.         ret = rtsp_listen(s);
  723.         if (ret)
  724.             return ret;
  725.     } else {
  726.         ret = ff_rtsp_connect(s);
  727.         if (ret)
  728.             return ret;
  729.  
  730.         rt->real_setup_cache = !s->nb_streams ? NULL :
  731.             av_mallocz_array(s->nb_streams, 2 * sizeof(*rt->real_setup_cache));
  732.         if (!rt->real_setup_cache && s->nb_streams)
  733.             return AVERROR(ENOMEM);
  734.         rt->real_setup = rt->real_setup_cache + s->nb_streams;
  735.  
  736.         if (rt->initial_pause) {
  737.             /* do not start immediately */
  738.         } else {
  739.             if ((ret = rtsp_read_play(s)) < 0) {
  740.                 ff_rtsp_close_streams(s);
  741.                 ff_rtsp_close_connections(s);
  742.                 return ret;
  743.             }
  744.         }
  745.     }
  746.  
  747.     return 0;
  748. }
  749.  
  750. int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
  751.                             uint8_t *buf, int buf_size)
  752. {
  753.     RTSPState *rt = s->priv_data;
  754.     int id, len, i, ret;
  755.     RTSPStream *rtsp_st;
  756.  
  757.     av_log(s, AV_LOG_TRACE, "tcp_read_packet:\n");
  758. redo:
  759.     for (;;) {
  760.         RTSPMessageHeader reply;
  761.  
  762.         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
  763.         if (ret < 0)
  764.             return ret;
  765.         if (ret == 1) /* received '$' */
  766.             break;
  767.         /* XXX: parse message */
  768.         if (rt->state != RTSP_STATE_STREAMING)
  769.             return 0;
  770.     }
  771.     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
  772.     if (ret != 3)
  773.         return -1;
  774.     id  = buf[0];
  775.     len = AV_RB16(buf + 1);
  776.     av_log(s, AV_LOG_TRACE, "id=%d len=%d\n", id, len);
  777.     if (len > buf_size || len < 8)
  778.         goto redo;
  779.     /* get the data */
  780.     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
  781.     if (ret != len)
  782.         return -1;
  783.     if (rt->transport == RTSP_TRANSPORT_RDT &&
  784.         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
  785.         return -1;
  786.  
  787.     /* find the matching stream */
  788.     for (i = 0; i < rt->nb_rtsp_streams; i++) {
  789.         rtsp_st = rt->rtsp_streams[i];
  790.         if (id >= rtsp_st->interleaved_min &&
  791.             id <= rtsp_st->interleaved_max)
  792.             goto found;
  793.     }
  794.     goto redo;
  795. found:
  796.     *prtsp_st = rtsp_st;
  797.     return len;
  798. }
  799.  
  800. static int resetup_tcp(AVFormatContext *s)
  801. {
  802.     RTSPState *rt = s->priv_data;
  803.     char host[1024];
  804.     int port;
  805.  
  806.     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
  807.                  s->filename);
  808.     ff_rtsp_undo_setup(s, 0);
  809.     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
  810.                                       rt->real_challenge);
  811. }
  812.  
  813. static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
  814. {
  815.     RTSPState *rt = s->priv_data;
  816.     int ret;
  817.     RTSPMessageHeader reply1, *reply = &reply1;
  818.     char cmd[1024];
  819.  
  820. retry:
  821.     if (rt->server_type == RTSP_SERVER_REAL) {
  822.         int i;
  823.  
  824.         for (i = 0; i < s->nb_streams; i++)
  825.             rt->real_setup[i] = s->streams[i]->discard;
  826.  
  827.         if (!rt->need_subscription) {
  828.             if (memcmp (rt->real_setup, rt->real_setup_cache,
  829.                         sizeof(enum AVDiscard) * s->nb_streams)) {
  830.                 snprintf(cmd, sizeof(cmd),
  831.                          "Unsubscribe: %s\r\n",
  832.                          rt->last_subscription);
  833.                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
  834.                                  cmd, reply, NULL);
  835.                 if (reply->status_code != RTSP_STATUS_OK)
  836.                     return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
  837.                 rt->need_subscription = 1;
  838.             }
  839.         }
  840.  
  841.         if (rt->need_subscription) {
  842.             int r, rule_nr, first = 1;
  843.  
  844.             memcpy(rt->real_setup_cache, rt->real_setup,
  845.                    sizeof(enum AVDiscard) * s->nb_streams);
  846.             rt->last_subscription[0] = 0;
  847.  
  848.             snprintf(cmd, sizeof(cmd),
  849.                      "Subscribe: ");
  850.             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  851.                 rule_nr = 0;
  852.                 for (r = 0; r < s->nb_streams; r++) {
  853.                     if (s->streams[r]->id == i) {
  854.                         if (s->streams[r]->discard != AVDISCARD_ALL) {
  855.                             if (!first)
  856.                                 av_strlcat(rt->last_subscription, ",",
  857.                                            sizeof(rt->last_subscription));
  858.                             ff_rdt_subscribe_rule(
  859.                                 rt->last_subscription,
  860.                                 sizeof(rt->last_subscription), i, rule_nr);
  861.                             first = 0;
  862.                         }
  863.                         rule_nr++;
  864.                     }
  865.                 }
  866.             }
  867.             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
  868.             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
  869.                              cmd, reply, NULL);
  870.             if (reply->status_code != RTSP_STATUS_OK)
  871.                 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
  872.             rt->need_subscription = 0;
  873.  
  874.             if (rt->state == RTSP_STATE_STREAMING)
  875.                 rtsp_read_play (s);
  876.         }
  877.     }
  878.  
  879.     ret = ff_rtsp_fetch_packet(s, pkt);
  880.     if (ret < 0) {
  881.         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
  882.             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
  883.                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
  884.                 RTSPMessageHeader reply1, *reply = &reply1;
  885.                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
  886.                 if (rtsp_read_pause(s) != 0)
  887.                     return -1;
  888.                 // TEARDOWN is required on Real-RTSP, but might make
  889.                 // other servers close the connection.
  890.                 if (rt->server_type == RTSP_SERVER_REAL)
  891.                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
  892.                                      reply, NULL);
  893.                 rt->session_id[0] = '\0';
  894.                 if (resetup_tcp(s) == 0) {
  895.                     rt->state = RTSP_STATE_IDLE;
  896.                     rt->need_subscription = 1;
  897.                     if (rtsp_read_play(s) != 0)
  898.                         return -1;
  899.                     goto retry;
  900.                 }
  901.             }
  902.         }
  903.         return ret;
  904.     }
  905.     rt->packets++;
  906.  
  907.     if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
  908.         /* send dummy request to keep TCP connection alive */
  909.         if ((av_gettime_relative() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
  910.             rt->auth_state.stale) {
  911.             if (rt->server_type == RTSP_SERVER_WMS ||
  912.                 (rt->server_type != RTSP_SERVER_REAL &&
  913.                  rt->get_parameter_supported)) {
  914.                 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
  915.             } else {
  916.                 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
  917.             }
  918.             /* The stale flag should be reset when creating the auth response in
  919.              * ff_rtsp_send_cmd_async, but reset it here just in case we never
  920.              * called the auth code (if we didn't have any credentials set). */
  921.             rt->auth_state.stale = 0;
  922.         }
  923.     }
  924.  
  925.     return 0;
  926. }
  927.  
  928. static int rtsp_read_seek(AVFormatContext *s, int stream_index,
  929.                           int64_t timestamp, int flags)
  930. {
  931.     RTSPState *rt = s->priv_data;
  932.     int ret;
  933.  
  934.     rt->seek_timestamp = av_rescale_q(timestamp,
  935.                                       s->streams[stream_index]->time_base,
  936.                                       AV_TIME_BASE_Q);
  937.     switch(rt->state) {
  938.     default:
  939.     case RTSP_STATE_IDLE:
  940.         break;
  941.     case RTSP_STATE_STREAMING:
  942.         if ((ret = rtsp_read_pause(s)) != 0)
  943.             return ret;
  944.         rt->state = RTSP_STATE_SEEKING;
  945.         if ((ret = rtsp_read_play(s)) != 0)
  946.             return ret;
  947.         break;
  948.     case RTSP_STATE_PAUSED:
  949.         rt->state = RTSP_STATE_IDLE;
  950.         break;
  951.     }
  952.     return 0;
  953. }
  954.  
  955. static const AVClass rtsp_demuxer_class = {
  956.     .class_name     = "RTSP demuxer",
  957.     .item_name      = av_default_item_name,
  958.     .option         = ff_rtsp_options,
  959.     .version        = LIBAVUTIL_VERSION_INT,
  960. };
  961.  
  962. AVInputFormat ff_rtsp_demuxer = {
  963.     .name           = "rtsp",
  964.     .long_name      = NULL_IF_CONFIG_SMALL("RTSP input"),
  965.     .priv_data_size = sizeof(RTSPState),
  966.     .read_probe     = rtsp_probe,
  967.     .read_header    = rtsp_read_header,
  968.     .read_packet    = rtsp_read_packet,
  969.     .read_close     = rtsp_read_close,
  970.     .read_seek      = rtsp_read_seek,
  971.     .flags          = AVFMT_NOFILE,
  972.     .read_play      = rtsp_read_play,
  973.     .read_pause     = rtsp_read_pause,
  974.     .priv_class     = &rtsp_demuxer_class,
  975. };
  976.