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