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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 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_out, 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. 

  364.     if (!linept) {

  365.         av_log(s, AV_LOG_ERROR, "Error parsing method string\n");

  366.         return AVERROR_INVALIDDATA;

  367.     }

  368. 

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

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

  371.         return AVERROR(EIO);

  372.     }

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

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

  375.     linept++;

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

  377.         *methodcode = ANNOUNCE;

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

  379.         *methodcode = OPTIONS;

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

  381.         *methodcode = RECORD;

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

  383.         *methodcode = SETUP;

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

  385.         *methodcode = PAUSE;

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

  387.         *methodcode = TEARDOWN;

  388.     else

  389.         *methodcode = UNKNOWN;

  390.     /* Check method with the state  */

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

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

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

  394.                    line);

  395.             return AVERROR_PROTOCOL_NOT_FOUND;

  396.         }

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

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

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

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

  401.                    line);

  402.             return AVERROR_PROTOCOL_NOT_FOUND;

  403.         }

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

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

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

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

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

  409.             return AVERROR_PROTOCOL_NOT_FOUND;

  410.         }

  411.     } else {

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

  413.         return AVERROR_BUG;

  414.     }

  415. 

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

  417.     if (!searchlinept) {

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

  419.         return AVERROR_INVALIDDATA;

  420.     }

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

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

  423.         return AVERROR(EIO);

  424.     }

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

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

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

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

  429.         int port;

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

  431.         int ctl_port;

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

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

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

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

  436.                      rt->control_uri);

  437.         if (strcmp(host, ctl_host))

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

  439.                    host, ctl_host);

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

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

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

  443.         if (*methodcode == ANNOUNCE) {

  444.             av_log(s, AV_LOG_INFO,

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

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

  447.         }

  448.     }

  449. 

  450.     linept = searchlinept + 1;

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

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

  453.         return AVERROR_PROTOCOL_NOT_FOUND;

  454.     }

  455.     return 0;

  456. }

  457. 

  458. int ff_rtsp_parse_streaming_commands(AVFormatContext *s)

  459. {

  460.     RTSPState *rt = s->priv_data;

  461.     unsigned char rbuf[4096];

  462.     unsigned char method[10];

  463.     char uri[500];

  464.     int ret;

  465.     int rbuflen               = 0;

  466.     RTSPMessageHeader request = { 0 };

  467.     enum RTSPMethod methodcode;

  468. 

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

  470.     if (ret < 0)

  471.         return ret;

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

  473.                              sizeof(method), &methodcode);

  474.     if (ret) {

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

  476.         return ret;

  477.     }

  478. 

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

  480.     if (ret)

  481.         return ret;

  482.     rt->seq++;

  483.     if (methodcode == PAUSE) {

  484.         rt->state = RTSP_STATE_PAUSED;

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

  486.         // TODO: Missing date header in response

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

  488.         ret = rtsp_send_reply(s, RTSP_STATUS_OK,

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

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

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

  492.         rt->state = RTSP_STATE_IDLE;

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

  494.         return 0;

  495.     }

  496.     return ret;

  497. }

  498. 

  499. static int rtsp_read_play(AVFormatContext *s)

  500. {

  501.     RTSPState *rt = s->priv_data;

  502.     RTSPMessageHeader reply1, *reply = &reply1;

  503.     int i;

  504.     char cmd[1024];

  505. 

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

  507.     rt->nb_byes = 0;

  508. 

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

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

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

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

  513.              * potential NAT router by sending dummy packets.

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

  515.              */

  516.             if (rtsp_st->rtp_handle &&

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

  518.                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);

  519.         }

  520.     }

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

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

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

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

  525.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  526.                 if (!rtpctx)

  527.                     continue;

  528.                 ff_rtp_reset_packet_queue(rtpctx);

  529.                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;

  530.                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;

  531.                 rtpctx->base_timestamp      = 0;

  532.                 rtpctx->timestamp           = 0;

  533.                 rtpctx->unwrapped_timestamp = 0;

  534.                 rtpctx->rtcp_ts_offset      = 0;

  535.             }

  536.         }

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

  538.             cmd[0] = 0;

  539.         } else {

  540.             snprintf(cmd, sizeof(cmd),

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

  542.                      rt->seek_timestamp / AV_TIME_BASE,

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

  544.         }

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

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

  547.             return ff_rtsp_averror(reply->status_code, -1);

  548.         }

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

  550.             reply->range_start != AV_NOPTS_VALUE) {

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

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

  553.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  554.                 AVStream *st = NULL;

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

  556.                     continue;

  557. 

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

  559.                 rtpctx->range_start_offset =

  560.                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,

  561.                                  st->time_base);

  562.             }

  563.         }

  564.     }

  565.     rt->state = RTSP_STATE_STREAMING;

  566.     return 0;

  567. }

  568. 

  569. /* pause the stream */

  570. static int rtsp_read_pause(AVFormatContext *s)

  571. {

  572.     RTSPState *rt = s->priv_data;

  573.     RTSPMessageHeader reply1, *reply = &reply1;

  574. 

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

  576.         return 0;

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

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

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

  580.             return ff_rtsp_averror(reply->status_code, -1);

  581.         }

  582.     }

  583.     rt->state = RTSP_STATE_PAUSED;

  584.     return 0;

  585. }

  586. 

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

  588. {

  589.     RTSPState *rt = s->priv_data;

  590.     char cmd[1024];

  591.     unsigned char *content = NULL;

  592.     int ret;

  593. 

  594.     /* describe the stream */

  595.     snprintf(cmd, sizeof(cmd),

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

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

  598.         /**

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

  600.          * Realmedia servers.

  601.          */

  602.         av_strlcat(cmd,

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

  604.                    sizeof(cmd));

  605.     }

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

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

  608.         av_freep(&content);

  609.         return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);

  610.     }

  611.     if (!content)

  612.         return AVERROR_INVALIDDATA;

  613. 

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

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

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

  617.     av_freep(&content);

  618.     if (ret < 0)

  619.         return ret;

  620. 

  621.     return 0;

  622. }

  623. 

  624. static int rtsp_listen(AVFormatContext *s)

  625. {

  626.     RTSPState *rt = s->priv_data;

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

  628.     char uri[500];

  629.     int port;

  630.     int default_port = RTSP_DEFAULT_PORT;

  631.     char tcpname[500];

  632.     const char *lower_proto = "tcp";

  633.     unsigned char rbuf[4096];

  634.     unsigned char method[10];

  635.     int rbuflen = 0;

  636.     int ret;

  637.     enum RTSPMethod methodcode;

  638. 

  639.     /* extract hostname and port */

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

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

  642. 

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

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

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

  646. 

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

  648.         lower_proto  = "tls";

  649.         default_port = RTSPS_DEFAULT_PORT;

  650.     }

  651. 

  652.     if (port < 0)

  653.         port = default_port;

  654. 

  655.     /* Create TCP connection */

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

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

  658. 

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

  660.                          &s->interrupt_callback, NULL)) {

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

  662.         return ret;

  663.     }

  664.     rt->state       = RTSP_STATE_IDLE;

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

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

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

  668.         if (ret < 0)

  669.             return ret;

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

  671.                                  sizeof(method), &methodcode);

  672.         if (ret) {

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

  674.             return ret;

  675.         }

  676. 

  677.         if (methodcode == ANNOUNCE) {

  678.             ret       = rtsp_read_announce(s);

  679.             rt->state = RTSP_STATE_PAUSED;

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

  681.             ret = rtsp_read_options(s);

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

  683.             ret = rtsp_read_record(s);

  684.             if (!ret)

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

  686.         } else if (methodcode == SETUP)

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

  688.         if (ret) {

  689.             ffurl_close(rt->rtsp_hd);

  690.             return AVERROR_INVALIDDATA;

  691.         }

  692.     }

  693.     return 0;

  694. }

  695. 

  696. static int rtsp_probe(AVProbeData *p)

  697. {

  698.     if (

  699. #if CONFIG_TLS_PROTOCOL

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

  701. #endif

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

  703.         return AVPROBE_SCORE_MAX;

  704.     return 0;

  705. }

  706. 

  707. static int rtsp_read_header(AVFormatContext *s)

  708. {

  709.     RTSPState *rt = s->priv_data;

  710.     int ret;

  711. 

  712.     if (rt->initial_timeout > 0)

  713.         rt->rtsp_flags |= RTSP_FLAG_LISTEN;

  714. 

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

  716.         ret = rtsp_listen(s);

  717.         if (ret)

  718.             return ret;

  719.     } else {

  720.         ret = ff_rtsp_connect(s);

  721.         if (ret)

  722.             return ret;

  723. 

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

  725.             av_mallocz_array(s->nb_streams, 2 * sizeof(*rt->real_setup_cache));

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

  727.             return AVERROR(ENOMEM);

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

  729. 

  730.         if (rt->initial_pause) {

  731.             /* do not start immediately */

  732.         } else {

  733.             if ((ret = rtsp_read_play(s)) < 0) {

  734.                 ff_rtsp_close_streams(s);

  735.                 ff_rtsp_close_connections(s);

  736.                 return ret;

  737.             }

  738.         }

  739.     }

  740. 

  741.     return 0;

  742. }

  743. 

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

  745.                             uint8_t *buf, int buf_size)

  746. {

  747.     RTSPState *rt = s->priv_data;

  748.     int id, len, i, ret;

  749.     RTSPStream *rtsp_st;

  750. 

  751.     av_dlog(s, "tcp_read_packet:\n");

  752. redo:

  753.     for (;;) {

  754.         RTSPMessageHeader reply;

  755. 

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

  757.         if (ret < 0)

  758.             return ret;

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

  760.             break;

  761.         /* XXX: parse message */

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

  763.             return 0;

  764.     }

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

  766.     if (ret != 3)

  767.         return -1;

  768.     id  = buf[0];

  769.     len = AV_RB16(buf + 1);

  770.     av_dlog(s, "id=%d len=%d\n", id, len);

  771.     if (len > buf_size || len < 8)

  772.         goto redo;

  773.     /* get the data */

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

  775.     if (ret != len)

  776.         return -1;

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

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

  779.         return -1;

  780. 

  781.     /* find the matching stream */

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

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

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

  785.             id <= rtsp_st->interleaved_max)

  786.             goto found;

  787.     }

  788.     goto redo;

  789. found:

  790.     *prtsp_st = rtsp_st;

  791.     return len;

  792. }

  793. 

  794. static int resetup_tcp(AVFormatContext *s)

  795. {

  796.     RTSPState *rt = s->priv_data;

  797.     char host[1024];

  798.     int port;

  799. 

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

  801.                  s->filename);

  802.     ff_rtsp_undo_setup(s, 0);

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

  804.                                       rt->real_challenge);

  805. }

  806. 

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

  808. {

  809.     RTSPState *rt = s->priv_data;

  810.     int ret;

  811.     RTSPMessageHeader reply1, *reply = &reply1;

  812.     char cmd[1024];

  813. 

  814. retry:

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

  816.         int i;

  817. 

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

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

  820. 

  821.         if (!rt->need_subscription) {

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

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

  824.                 snprintf(cmd, sizeof(cmd),

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

  826.                          rt->last_subscription);

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

  828.                                  cmd, reply, NULL);

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

  830.                     return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);

  831.                 rt->need_subscription = 1;

  832.             }

  833.         }

  834. 

  835.         if (rt->need_subscription) {

  836.             int r, rule_nr, first = 1;

  837. 

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

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

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

  841. 

  842.             snprintf(cmd, sizeof(cmd),

  843.                      "Subscribe: ");

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

  845.                 rule_nr = 0;

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

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

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

  849.                             if (!first)

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

  851.                                            sizeof(rt->last_subscription));

  852.                             ff_rdt_subscribe_rule(

  853.                                 rt->last_subscription,

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

  855.                             first = 0;

  856.                         }

  857.                         rule_nr++;

  858.                     }

  859.                 }

  860.             }

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

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

  863.                              cmd, reply, NULL);

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

  865.                 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);

  866.             rt->need_subscription = 0;

  867. 

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

  869.                 rtsp_read_play (s);

  870.         }

  871.     }

  872. 

  873.     ret = ff_rtsp_fetch_packet(s, pkt);

  874.     if (ret < 0) {

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

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

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

  878.                 RTSPMessageHeader reply1, *reply = &reply1;

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

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

  881.                     return -1;

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

  883.                 // other servers close the connection.

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

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

  886.                                      reply, NULL);

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

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

  889.                     rt->state = RTSP_STATE_IDLE;

  890.                     rt->need_subscription = 1;

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

  892.                         return -1;

  893.                     goto retry;

  894.                 }

  895.             }

  896.         }

  897.         return ret;

  898.     }

  899.     rt->packets++;

  900. 

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

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

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

  904.             rt->auth_state.stale) {

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

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

  907.                  rt->get_parameter_supported)) {

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

  909.             } else {

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

  911.             }

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

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

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

  915.             rt->auth_state.stale = 0;

  916.         }

  917.     }

  918. 

  919.     return 0;

  920. }

  921. 

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

  923.                           int64_t timestamp, int flags)

  924. {

  925.     RTSPState *rt = s->priv_data;

  926.     int ret;

  927. 

  928.     rt->seek_timestamp = av_rescale_q(timestamp,

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

  930.                                       AV_TIME_BASE_Q);

  931.     switch(rt->state) {

  932.     default:

  933.     case RTSP_STATE_IDLE:

  934.         break;

  935.     case RTSP_STATE_STREAMING:

  936.         if ((ret = rtsp_read_pause(s)) != 0)

  937.             return ret;

  938.         rt->state = RTSP_STATE_SEEKING;

  939.         if ((ret = rtsp_read_play(s)) != 0)

  940.             return ret;

  941.         break;

  942.     case RTSP_STATE_PAUSED:

  943.         rt->state = RTSP_STATE_IDLE;

  944.         break;

  945.     }

  946.     return 0;

  947. }

  948. 

  949. static const AVClass rtsp_demuxer_class = {

  950.     .class_name     = "RTSP demuxer",

  951.     .item_name      = av_default_item_name,

  952.     .option         = ff_rtsp_options,

  953.     .version        = LIBAVUTIL_VERSION_INT,

  954. };

  955. 

  956. AVInputFormat ff_rtsp_demuxer = {

  957.     .name           = "rtsp",

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

  959.     .priv_data_size = sizeof(RTSPState),

  960.     .read_probe     = rtsp_probe,

  961.     .read_header    = rtsp_read_header,

  962.     .read_packet    = rtsp_read_packet,

  963.     .read_close     = rtsp_read_close,

  964.     .read_seek      = rtsp_read_seek,

  965.     .flags          = AVFMT_NOFILE,

  966.     .read_play      = rtsp_read_play,

  967.     .read_pause     = rtsp_read_pause,

  968.     .priv_class     = &rtsp_demuxer_class,

  969. };