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FFmpeg/libavformat/rtspdec.c

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  1. /*

  2.  * RTSP demuxer

  3.  * Copyright (c) 2002 Fabrice Bellard

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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(s, 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, rt->protocols, NULL);

  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.         return AVERROR_INVALIDDATA;

  372. 

  373.     if (linept - line > methodsize - 1) {

  374.         av_log(s, AV_LOG_ERROR, "Method string too long\n");

  375.         return AVERROR(EIO);

  376.     }

  377.     memcpy(method, line, linept - line);

  378.     method[linept - line] = '\0';

  379.     linept++;

  380.     if (!strcmp(method, "ANNOUNCE"))

  381.         *methodcode = ANNOUNCE;

  382.     else if (!strcmp(method, "OPTIONS"))

  383.         *methodcode = OPTIONS;

  384.     else if (!strcmp(method, "RECORD"))

  385.         *methodcode = RECORD;

  386.     else if (!strcmp(method, "SETUP"))

  387.         *methodcode = SETUP;

  388.     else if (!strcmp(method, "PAUSE"))

  389.         *methodcode = PAUSE;

  390.     else if (!strcmp(method, "TEARDOWN"))

  391.         *methodcode = TEARDOWN;

  392.     else

  393.         *methodcode = UNKNOWN;

  394.     /* Check method with the state  */

  395.     if (rt->state == RTSP_STATE_IDLE) {

  396.         if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {

  397.             av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",

  398.                    line);

  399.             return AVERROR_PROTOCOL_NOT_FOUND;

  400.         }

  401.     } else if (rt->state == RTSP_STATE_PAUSED) {

  402.         if ((*methodcode != OPTIONS) && (*methodcode != RECORD)

  403.             && (*methodcode != SETUP)) {

  404.             av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",

  405.                    line);

  406.             return AVERROR_PROTOCOL_NOT_FOUND;

  407.         }

  408.     } else if (rt->state == RTSP_STATE_STREAMING) {

  409.         if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)

  410.             && (*methodcode != TEARDOWN)) {

  411.             av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"

  412.                    " %s\n", line);

  413.             return AVERROR_PROTOCOL_NOT_FOUND;

  414.         }

  415.     } else {

  416.         av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);

  417.         return AVERROR_BUG;

  418.     }

  419. 

  420.     searchlinept = strchr(linept, ' ');

  421.     if (!searchlinept) {

  422.         av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");

  423.         return AVERROR_INVALIDDATA;

  424.     }

  425.     if (searchlinept - linept > urisize - 1) {

  426.         av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");

  427.         return AVERROR(EIO);

  428.     }

  429.     memcpy(uri, linept, searchlinept - linept);

  430.     uri[searchlinept - linept] = '\0';

  431.     if (strcmp(rt->control_uri, uri)) {

  432.         char host[128], path[512], auth[128];

  433.         int port;

  434.         char ctl_host[128], ctl_path[512], ctl_auth[128];

  435.         int ctl_port;

  436.         av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,

  437.                      path, sizeof(path), uri);

  438.         av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,

  439.                      sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),

  440.                      rt->control_uri);

  441.         if (strcmp(host, ctl_host))

  442.             av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",

  443.                    host, ctl_host);

  444.         if (strcmp(path, ctl_path) && *methodcode != SETUP)

  445.             av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"

  446.                    " %s\n", path, ctl_path);

  447.         if (*methodcode == ANNOUNCE) {

  448.             av_log(s, AV_LOG_INFO,

  449.                    "Updating control URI to %s\n", uri);

  450.             av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));

  451.         }

  452.     }

  453. 

  454.     linept = searchlinept + 1;

  455.     if (!av_strstart(linept, "RTSP/1.0", NULL)) {

  456.         av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");

  457.         return AVERROR_PROTOCOL_NOT_FOUND;

  458.     }

  459.     return 0;

  460. }

  461. 

  462. int ff_rtsp_parse_streaming_commands(AVFormatContext *s)

  463. {

  464.     RTSPState *rt = s->priv_data;

  465.     unsigned char rbuf[4096];

  466.     unsigned char method[10];

  467.     char uri[500];

  468.     int ret;

  469.     int rbuflen               = 0;

  470.     RTSPMessageHeader request = { 0 };

  471.     enum RTSPMethod methodcode;

  472. 

  473.     ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);

  474.     if (ret < 0)

  475.         return ret;

  476.     ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,

  477.                              sizeof(method), &methodcode);

  478.     if (ret) {

  479.         av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");

  480.         return ret;

  481.     }

  482. 

  483.     ret = rtsp_read_request(s, &request, method);

  484.     if (ret)

  485.         return ret;

  486.     rt->seq++;

  487.     if (methodcode == PAUSE) {

  488.         rt->state = RTSP_STATE_PAUSED;

  489.         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);

  490.         // TODO: Missing date header in response

  491.     } else if (methodcode == OPTIONS) {

  492.         ret = rtsp_send_reply(s, RTSP_STATUS_OK,

  493.                               "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "

  494.                               "RECORD\r\n", request.seq);

  495.     } else if (methodcode == TEARDOWN) {

  496.         rt->state = RTSP_STATE_IDLE;

  497.         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);

  498.         return 0;

  499.     }

  500.     return ret;

  501. }

  502. 

  503. static int rtsp_read_play(AVFormatContext *s)

  504. {

  505.     RTSPState *rt = s->priv_data;

  506.     RTSPMessageHeader reply1, *reply = &reply1;

  507.     int i;

  508.     char cmd[1024];

  509. 

  510.     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);

  511.     rt->nb_byes = 0;

  512. 

  513.     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP) {

  514.         for (i = 0; i < rt->nb_rtsp_streams; i++) {

  515.             RTSPStream *rtsp_st = rt->rtsp_streams[i];

  516.             /* Try to initialize the connection state in a

  517.              * potential NAT router by sending dummy packets.

  518.              * RTP/RTCP dummy packets are used for RDT, too.

  519.              */

  520.             if (rtsp_st->rtp_handle &&

  521.                 !(rt->server_type == RTSP_SERVER_WMS && i > 1))

  522.                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);

  523.         }

  524.     }

  525.     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {

  526.         if (rt->transport == RTSP_TRANSPORT_RTP) {

  527.             for (i = 0; i < rt->nb_rtsp_streams; i++) {

  528.                 RTSPStream *rtsp_st = rt->rtsp_streams[i];

  529.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  530.                 if (!rtpctx)

  531.                     continue;

  532.                 ff_rtp_reset_packet_queue(rtpctx);

  533.                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;

  534.                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;

  535.                 rtpctx->base_timestamp      = 0;

  536.                 rtpctx->timestamp           = 0;

  537.                 rtpctx->unwrapped_timestamp = 0;

  538.                 rtpctx->rtcp_ts_offset      = 0;

  539.             }

  540.         }

  541.         if (rt->state == RTSP_STATE_PAUSED) {

  542.             cmd[0] = 0;

  543.         } else {

  544.             snprintf(cmd, sizeof(cmd),

  545.                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",

  546.                      rt->seek_timestamp / AV_TIME_BASE,

  547.                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);

  548.         }

  549.         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);

  550.         if (reply->status_code != RTSP_STATUS_OK) {

  551.             return -1;

  552.         }

  553.         if (rt->transport == RTSP_TRANSPORT_RTP &&

  554.             reply->range_start != AV_NOPTS_VALUE) {

  555.             for (i = 0; i < rt->nb_rtsp_streams; i++) {

  556.                 RTSPStream *rtsp_st = rt->rtsp_streams[i];

  557.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  558.                 AVStream *st = NULL;

  559.                 if (!rtpctx || rtsp_st->stream_index < 0)

  560.                     continue;

  561.                 st = s->streams[rtsp_st->stream_index];

  562.                 rtpctx->range_start_offset =

  563.                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,

  564.                                  st->time_base);

  565.             }

  566.         }

  567.     }

  568.     rt->state = RTSP_STATE_STREAMING;

  569.     return 0;

  570. }

  571. 

  572. /* pause the stream */

  573. static int rtsp_read_pause(AVFormatContext *s)

  574. {

  575.     RTSPState *rt = s->priv_data;

  576.     RTSPMessageHeader reply1, *reply = &reply1;

  577. 

  578.     if (rt->state != RTSP_STATE_STREAMING)

  579.         return 0;

  580.     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {

  581.         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);

  582.         if (reply->status_code != RTSP_STATUS_OK) {

  583.             return -1;

  584.         }

  585.     }

  586.     rt->state = RTSP_STATE_PAUSED;

  587.     return 0;

  588. }

  589. 

  590. int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)

  591. {

  592.     RTSPState *rt = s->priv_data;

  593.     char cmd[1024];

  594.     unsigned char *content = NULL;

  595.     int ret;

  596. 

  597.     /* describe the stream */

  598.     snprintf(cmd, sizeof(cmd),

  599.              "Accept: application/sdp\r\n");

  600.     if (rt->server_type == RTSP_SERVER_REAL) {

  601.         /**

  602.          * The Require: attribute is needed for proper streaming from

  603.          * Realmedia servers.

  604.          */

  605.         av_strlcat(cmd,

  606.                    "Require: com.real.retain-entity-for-setup\r\n",

  607.                    sizeof(cmd));

  608.     }

  609.     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);

  610.     if (!content)

  611.         return AVERROR_INVALIDDATA;

  612.     if (reply->status_code != RTSP_STATUS_OK) {

  613.         av_freep(&content);

  614.         return AVERROR_INVALIDDATA;

  615.     }

  616. 

  617.     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);

  618.     /* now we got the SDP description, we parse it */

  619.     ret = ff_sdp_parse(s, (const char *)content);

  620.     av_freep(&content);

  621.     if (ret < 0)

  622.         return ret;

  623. 

  624.     return 0;

  625. }

  626. 

  627. static int rtsp_listen(AVFormatContext *s)

  628. {

  629.     RTSPState *rt = s->priv_data;

  630.     char proto[128], host[128], path[512], auth[128];

  631.     char uri[500];

  632.     int port;

  633.     int default_port = RTSP_DEFAULT_PORT;

  634.     char tcpname[500];

  635.     const char *lower_proto = "tcp";

  636.     unsigned char rbuf[4096];

  637.     unsigned char method[10];

  638.     int rbuflen = 0;

  639.     int ret;

  640.     enum RTSPMethod methodcode;

  641. 

  642.     if (!rt->protocols) {

  643.         rt->protocols = ffurl_get_protocols(s->protocol_whitelist,

  644.                                             s->protocol_blacklist);

  645.         if (!rt->protocols)

  646.             return AVERROR(ENOMEM);

  647.     }

  648. 

  649.     /* extract hostname and port */

  650.     av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),

  651.                  &port, path, sizeof(path), s->filename);

  652. 

  653.     /* ff_url_join. No authorization by now (NULL) */

  654.     ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,

  655.                 port, "%s", path);

  656. 

  657.     if (!strcmp(proto, "rtsps")) {

  658.         lower_proto  = "tls";

  659.         default_port = RTSPS_DEFAULT_PORT;

  660.     }

  661. 

  662.     if (port < 0)

  663.         port = default_port;

  664. 

  665.     /* Create TCP connection */

  666.     ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,

  667.                 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);

  668. 

  669.     if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,

  670.                          &s->interrupt_callback, NULL, rt->protocols, NULL)) {

  671.         av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");

  672.         return ret;

  673.     }

  674.     rt->state       = RTSP_STATE_IDLE;

  675.     rt->rtsp_hd_out = rt->rtsp_hd;

  676.     for (;;) { /* Wait for incoming RTSP messages */

  677.         ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);

  678.         if (ret < 0)

  679.             return ret;

  680.         ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,

  681.                                  sizeof(method), &methodcode);

  682.         if (ret) {

  683.             av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");

  684.             return ret;

  685.         }

  686. 

  687.         if (methodcode == ANNOUNCE) {

  688.             ret       = rtsp_read_announce(s);

  689.             rt->state = RTSP_STATE_PAUSED;

  690.         } else if (methodcode == OPTIONS) {

  691.             ret = rtsp_read_options(s);

  692.         } else if (methodcode == RECORD) {

  693.             ret = rtsp_read_record(s);

  694.             if (!ret)

  695.                 return 0; // We are ready for streaming

  696.         } else if (methodcode == SETUP)

  697.             ret = rtsp_read_setup(s, host, uri);

  698.         if (ret) {

  699.             ffurl_close(rt->rtsp_hd);

  700.             return AVERROR_INVALIDDATA;

  701.         }

  702.     }

  703. }

  704. 

  705. static int rtsp_probe(AVProbeData *p)

  706. {

  707.     if (

  708. #if CONFIG_TLS_PROTOCOL

  709.         av_strstart(p->filename, "rtsps:", NULL) ||

  710. #endif

  711.         av_strstart(p->filename, "rtsp:", NULL))

  712.         return AVPROBE_SCORE_MAX;

  713.     return 0;

  714. }

  715. 

  716. static int rtsp_read_header(AVFormatContext *s)

  717. {

  718.     RTSPState *rt = s->priv_data;

  719.     int ret;

  720. 

  721.     if (rt->initial_timeout > 0)

  722.         rt->rtsp_flags |= RTSP_FLAG_LISTEN;

  723. 

  724.     if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {

  725.         ret = rtsp_listen(s);

  726.         if (ret)

  727.             return ret;

  728.     } else {

  729.         ret = ff_rtsp_connect(s);

  730.         if (ret)

  731.             return ret;

  732. 

  733.         rt->real_setup_cache = !s->nb_streams ? NULL :

  734.             av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));

  735.         if (!rt->real_setup_cache && s->nb_streams)

  736.             return AVERROR(ENOMEM);

  737.         rt->real_setup = rt->real_setup_cache + s->nb_streams;

  738. 

  739.         if (rt->initial_pause) {

  740.             /* do not start immediately */

  741.         } else {

  742.             if (rtsp_read_play(s) < 0) {

  743.                 ff_rtsp_close_streams(s);

  744.                 ff_rtsp_close_connections(s);

  745.                 return AVERROR_INVALIDDATA;

  746.             }

  747.         }

  748.     }

  749. 

  750.     return 0;

  751. }

  752. 

  753. int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,

  754.                             uint8_t *buf, int buf_size)

  755. {

  756.     RTSPState *rt = s->priv_data;

  757.     int id, len, i, ret;

  758.     RTSPStream *rtsp_st;

  759. 

  760.     av_log(s, AV_LOG_TRACE, "tcp_read_packet:\n");

  761. redo:

  762.     for (;;) {

  763.         RTSPMessageHeader reply;

  764. 

  765.         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);

  766.         if (ret < 0)

  767.             return ret;

  768.         if (ret == 1) /* received '$' */

  769.             break;

  770.         /* XXX: parse message */

  771.         if (rt->state != RTSP_STATE_STREAMING)

  772.             return 0;

  773.     }

  774.     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);

  775.     if (ret != 3)

  776.         return -1;

  777.     id  = buf[0];

  778.     len = AV_RB16(buf + 1);

  779.     av_log(s, AV_LOG_TRACE, "id=%d len=%d\n", id, len);

  780.     if (len > buf_size || len < 12)

  781.         goto redo;

  782.     /* get the data */

  783.     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);

  784.     if (ret != len)

  785.         return -1;

  786.     if (rt->transport == RTSP_TRANSPORT_RDT &&

  787.         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)

  788.         return -1;

  789. 

  790.     /* find the matching stream */

  791.     for (i = 0; i < rt->nb_rtsp_streams; i++) {

  792.         rtsp_st = rt->rtsp_streams[i];

  793.         if (id >= rtsp_st->interleaved_min &&

  794.             id <= rtsp_st->interleaved_max)

  795.             goto found;

  796.     }

  797.     goto redo;

  798. found:

  799.     *prtsp_st = rtsp_st;

  800.     return len;

  801. }

  802. 

  803. static int resetup_tcp(AVFormatContext *s)

  804. {

  805.     RTSPState *rt = s->priv_data;

  806.     char host[1024];

  807.     int port;

  808. 

  809.     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,

  810.                  s->filename);

  811.     ff_rtsp_undo_setup(s, 0);

  812.     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,

  813.                                       rt->real_challenge);

  814. }

  815. 

  816. static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)

  817. {

  818.     RTSPState *rt = s->priv_data;

  819.     int ret;

  820.     RTSPMessageHeader reply1, *reply = &reply1;

  821.     char cmd[1024];

  822. 

  823. retry:

  824.     if (rt->server_type == RTSP_SERVER_REAL) {

  825.         int i;

  826. 

  827.         for (i = 0; i < s->nb_streams; i++)

  828.             rt->real_setup[i] = s->streams[i]->discard;

  829. 

  830.         if (!rt->need_subscription) {

  831.             if (memcmp (rt->real_setup, rt->real_setup_cache,

  832.                         sizeof(enum AVDiscard) * s->nb_streams)) {

  833.                 snprintf(cmd, sizeof(cmd),

  834.                          "Unsubscribe: %s\r\n",

  835.                          rt->last_subscription);

  836.                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,

  837.                                  cmd, reply, NULL);

  838.                 if (reply->status_code != RTSP_STATUS_OK)

  839.                     return AVERROR_INVALIDDATA;

  840.                 rt->need_subscription = 1;

  841.             }

  842.         }

  843. 

  844.         if (rt->need_subscription) {

  845.             int r, rule_nr, first = 1;

  846. 

  847.             memcpy(rt->real_setup_cache, rt->real_setup,

  848.                    sizeof(enum AVDiscard) * s->nb_streams);

  849.             rt->last_subscription[0] = 0;

  850. 

  851.             snprintf(cmd, sizeof(cmd),

  852.                      "Subscribe: ");

  853.             for (i = 0; i < rt->nb_rtsp_streams; i++) {

  854.                 rule_nr = 0;

  855.                 for (r = 0; r < s->nb_streams; r++) {

  856.                     if (s->streams[r]->id == i) {

  857.                         if (s->streams[r]->discard != AVDISCARD_ALL) {

  858.                             if (!first)

  859.                                 av_strlcat(rt->last_subscription, ",",

  860.                                            sizeof(rt->last_subscription));

  861.                             ff_rdt_subscribe_rule(

  862.                                 rt->last_subscription,

  863.                                 sizeof(rt->last_subscription), i, rule_nr);

  864.                             first = 0;

  865.                         }

  866.                         rule_nr++;

  867.                     }

  868.                 }

  869.             }

  870.             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);

  871.             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,

  872.                              cmd, reply, NULL);

  873.             if (reply->status_code != RTSP_STATUS_OK)

  874.                 return AVERROR_INVALIDDATA;

  875.             rt->need_subscription = 0;

  876. 

  877.             if (rt->state == RTSP_STATE_STREAMING)

  878.                 rtsp_read_play (s);

  879.         }

  880.     }

  881. 

  882.     ret = ff_rtsp_fetch_packet(s, pkt);

  883.     if (ret < 0) {

  884.         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {

  885.             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&

  886.                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {

  887.                 RTSPMessageHeader reply1, *reply = &reply1;

  888.                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");

  889.                 if (rtsp_read_pause(s) != 0)

  890.                     return -1;

  891.                 // TEARDOWN is required on Real-RTSP, but might make

  892.                 // other servers close the connection.

  893.                 if (rt->server_type == RTSP_SERVER_REAL)

  894.                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,

  895.                                      reply, NULL);

  896.                 rt->session_id[0] = '\0';

  897.                 if (resetup_tcp(s) == 0) {

  898.                     rt->state = RTSP_STATE_IDLE;

  899.                     rt->need_subscription = 1;

  900.                     if (rtsp_read_play(s) != 0)

  901.                         return -1;

  902.                     goto retry;

  903.                 }

  904.             }

  905.         }

  906.         return ret;

  907.     }

  908.     rt->packets++;

  909. 

  910.     if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {

  911.         /* send dummy request to keep TCP connection alive */

  912.         if ((av_gettime_relative() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||

  913.             rt->auth_state.stale) {

  914.             if (rt->server_type == RTSP_SERVER_WMS ||

  915.                 (rt->server_type != RTSP_SERVER_REAL &&

  916.                  rt->get_parameter_supported)) {

  917.                 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);

  918.             } else {

  919.                 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);

  920.             }

  921.             /* The stale flag should be reset when creating the auth response in

  922.              * ff_rtsp_send_cmd_async, but reset it here just in case we never

  923.              * called the auth code (if we didn't have any credentials set). */

  924.             rt->auth_state.stale = 0;

  925.         }

  926.     }

  927. 

  928.     return 0;

  929. }

  930. 

  931. static int rtsp_read_seek(AVFormatContext *s, int stream_index,

  932.                           int64_t timestamp, int flags)

  933. {

  934.     RTSPState *rt = s->priv_data;

  935. 

  936.     rt->seek_timestamp = av_rescale_q(timestamp,

  937.                                       s->streams[stream_index]->time_base,

  938.                                       AV_TIME_BASE_Q);

  939.     switch(rt->state) {

  940.     default:

  941.     case RTSP_STATE_IDLE:

  942.         break;

  943.     case RTSP_STATE_STREAMING:

  944.         if (rtsp_read_pause(s) != 0)

  945.             return -1;

  946.         rt->state = RTSP_STATE_SEEKING;

  947.         if (rtsp_read_play(s) != 0)

  948.             return -1;

  949.         break;

  950.     case RTSP_STATE_PAUSED:

  951.         rt->state = RTSP_STATE_IDLE;

  952.         break;

  953.     }

  954.     return 0;

  955. }

  956. 

  957. static const AVClass rtsp_demuxer_class = {

  958.     .class_name     = "RTSP demuxer",

  959.     .item_name      = av_default_item_name,

  960.     .option         = ff_rtsp_options,

  961.     .version        = LIBAVUTIL_VERSION_INT,

  962. };

  963. 

  964. AVInputFormat ff_rtsp_demuxer = {

  965.     .name           = "rtsp",

  966.     .long_name      = NULL_IF_CONFIG_SMALL("RTSP input"),

  967.     .priv_data_size = sizeof(RTSPState),

  968.     .read_probe     = rtsp_probe,

  969.     .read_header    = rtsp_read_header,

  970.     .read_packet    = rtsp_read_packet,

  971.     .read_close     = rtsp_read_close,

  972.     .read_seek      = rtsp_read_seek,

  973.     .flags          = AVFMT_NOFILE,

  974.     .read_play      = rtsp_read_play,

  975.     .read_pause     = rtsp_read_pause,

  976.     .priv_class     = &rtsp_demuxer_class,

  977. };