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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 "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_log(s, AV_LOG_TRACE, "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_log(s, AV_LOG_TRACE, "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.             AVDictionary *opts = NULL;

  291.             char buf[256];

  292.             snprintf(buf, sizeof(buf), "%d", rt->buffer_size);

  293.             av_dict_set(&opts, "buffer_size", buf, 0);

  294.             ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);

  295.             av_log(s, AV_LOG_TRACE, "Opening: %s", url);

  296.             ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,

  297.                              &s->interrupt_callback, &opts);

  298.             av_dict_free(&opts);

  299.             if (ret)

  300.                 localport += 2;

  301.         } while (ret || localport > rt->rtp_port_max);

  302.         if (localport > rt->rtp_port_max) {

  303.             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);

  304.             return ret;

  305.         }

  306. 

  307.         av_log(s, AV_LOG_TRACE, "Listening on: %d",

  308.                 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));

  309.         if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {

  310.             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);

  311.             return ret;

  312.         }

  313. 

  314.         localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);

  315.         snprintf(responseheaders, sizeof(responseheaders), "Transport: "

  316.                  "RTP/AVP/UDP;unicast;mode=receive;source=%s;"

  317.                  "client_port=%d-%d;server_port=%d-%d\r\n",

  318.                  host, request.transports[0].client_port_min,

  319.                  request.transports[0].client_port_max, localport,

  320.                  localport + 1);

  321.     }

  322. 

  323.     /* Establish sessionid if not previously set */

  324.     /* Put this in a function? */

  325.     /* RFC 2326: session id must be at least 8 digits */

  326.     while (strlen(rt->session_id) < 8)

  327.         av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());

  328. 

  329.     av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",

  330.                 rt->session_id);

  331.     /* Send Reply */

  332.     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);

  333. 

  334.     rt->state = RTSP_STATE_PAUSED;

  335.     return 0;

  336. }

  337. 

  338. static int rtsp_read_record(AVFormatContext *s)

  339. {

  340.     RTSPState *rt             = s->priv_data;

  341.     RTSPMessageHeader request = { 0 };

  342.     int ret                   = 0;

  343.     char responseheaders[1024];

  344. 

  345.     ret = rtsp_read_request(s, &request, "RECORD");

  346.     if (ret)

  347.         return ret;

  348.     ret = check_sessionid(s, &request);

  349.     if (ret)

  350.         return ret;

  351.     rt->seq++;

  352.     snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",

  353.              rt->session_id);

  354.     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);

  355. 

  356.     rt->state = RTSP_STATE_STREAMING;

  357.     return 0;

  358. }

  359. 

  360. static inline int parse_command_line(AVFormatContext *s, const char *line,

  361.                                      int linelen, char *uri, int urisize,

  362.                                      char *method, int methodsize,

  363.                                      enum RTSPMethod *methodcode)

  364. {

  365.     RTSPState *rt = s->priv_data;

  366.     const char *linept, *searchlinept;

  367.     linept = strchr(line, ' ');

  368. 

  369.     if (!linept)

  370.         return AVERROR_INVALIDDATA;

  371. 

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

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

  374.         return AVERROR(EIO);

  375.     }

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

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

  378.     linept++;

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

  380.         *methodcode = ANNOUNCE;

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

  382.         *methodcode = OPTIONS;

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

  384.         *methodcode = RECORD;

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

  386.         *methodcode = SETUP;

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

  388.         *methodcode = PAUSE;

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

  390.         *methodcode = TEARDOWN;

  391.     else

  392.         *methodcode = UNKNOWN;

  393.     /* Check method with the state  */

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

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

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

  397.                    line);

  398.             return AVERROR_PROTOCOL_NOT_FOUND;

  399.         }

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

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

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

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

  404.                    line);

  405.             return AVERROR_PROTOCOL_NOT_FOUND;

  406.         }

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

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

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

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

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

  412.             return AVERROR_PROTOCOL_NOT_FOUND;

  413.         }

  414.     } else {

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

  416.         return AVERROR_BUG;

  417.     }

  418. 

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

  420.     if (!searchlinept) {

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

  422.         return AVERROR_INVALIDDATA;

  423.     }

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

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

  426.         return AVERROR(EIO);

  427.     }

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

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

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

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

  432.         int port;

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

  434.         int ctl_port;

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

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

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

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

  439.                      rt->control_uri);

  440.         if (strcmp(host, ctl_host))

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

  442.                    host, ctl_host);

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

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

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

  446.         if (*methodcode == ANNOUNCE) {

  447.             av_log(s, AV_LOG_INFO,

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

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

  450.         }

  451.     }

  452. 

  453.     linept = searchlinept + 1;

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

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

  456.         return AVERROR_PROTOCOL_NOT_FOUND;

  457.     }

  458.     return 0;

  459. }

  460. 

  461. int ff_rtsp_parse_streaming_commands(AVFormatContext *s)

  462. {

  463.     RTSPState *rt = s->priv_data;

  464.     unsigned char rbuf[4096];

  465.     unsigned char method[10];

  466.     char uri[500];

  467.     int ret;

  468.     int rbuflen               = 0;

  469.     RTSPMessageHeader request = { 0 };

  470.     enum RTSPMethod methodcode;

  471. 

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

  473.     if (ret < 0)

  474.         return ret;

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

  476.                              sizeof(method), &methodcode);

  477.     if (ret) {

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

  479.         return ret;

  480.     }

  481. 

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

  483.     if (ret)

  484.         return ret;

  485.     rt->seq++;

  486.     if (methodcode == PAUSE) {

  487.         rt->state = RTSP_STATE_PAUSED;

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

  489.         // TODO: Missing date header in response

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

  491.         ret = rtsp_send_reply(s, RTSP_STATUS_OK,

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

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

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

  495.         rt->state = RTSP_STATE_IDLE;

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

  497.         return 0;

  498.     }

  499.     return ret;

  500. }

  501. 

  502. static int rtsp_read_play(AVFormatContext *s)

  503. {

  504.     RTSPState *rt = s->priv_data;

  505.     RTSPMessageHeader reply1, *reply = &reply1;

  506.     int i;

  507.     char cmd[1024];

  508. 

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

  510.     rt->nb_byes = 0;

  511. 

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

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

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

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

  516.              * potential NAT router by sending dummy packets.

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

  518.              */

  519.             if (rtsp_st->rtp_handle &&

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

  521.                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);

  522.         }

  523.     }

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

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

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

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

  528.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  529.                 if (!rtpctx)

  530.                     continue;

  531.                 ff_rtp_reset_packet_queue(rtpctx);

  532.                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;

  533.                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;

  534.                 rtpctx->base_timestamp      = 0;

  535.                 rtpctx->timestamp           = 0;

  536.                 rtpctx->unwrapped_timestamp = 0;

  537.                 rtpctx->rtcp_ts_offset      = 0;

  538.             }

  539.         }

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

  541.             cmd[0] = 0;

  542.         } else {

  543.             snprintf(cmd, sizeof(cmd),

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

  545.                      rt->seek_timestamp / AV_TIME_BASE,

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

  547.         }

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

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

  550.             return -1;

  551.         }

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

  553.             reply->range_start != AV_NOPTS_VALUE) {

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

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

  556.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  557.                 AVStream *st = NULL;

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

  559.                     continue;

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

  561.                 rtpctx->range_start_offset =

  562.                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,

  563.                                  st->time_base);

  564.             }

  565.         }

  566.     }

  567.     rt->state = RTSP_STATE_STREAMING;

  568.     return 0;

  569. }

  570. 

  571. /* pause the stream */

  572. static int rtsp_read_pause(AVFormatContext *s)

  573. {

  574.     RTSPState *rt = s->priv_data;

  575.     RTSPMessageHeader reply1, *reply = &reply1;

  576. 

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

  578.         return 0;

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

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

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

  582.             return -1;

  583.         }

  584.     }

  585.     rt->state = RTSP_STATE_PAUSED;

  586.     return 0;

  587. }

  588. 

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

  590. {

  591.     RTSPState *rt = s->priv_data;

  592.     char cmd[1024];

  593.     unsigned char *content = NULL;

  594.     int ret;

  595. 

  596.     /* describe the stream */

  597.     snprintf(cmd, sizeof(cmd),

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

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

  600.         /**

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

  602.          * Realmedia servers.

  603.          */

  604.         av_strlcat(cmd,

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

  606.                    sizeof(cmd));

  607.     }

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

  609.     if (!content)

  610.         return AVERROR_INVALIDDATA;

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

  612.         av_freep(&content);

  613.         return AVERROR_INVALIDDATA;

  614.     }

  615. 

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

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

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

  619.     av_freep(&content);

  620.     if (ret < 0)

  621.         return ret;

  622. 

  623.     return 0;

  624. }

  625. 

  626. static int rtsp_listen(AVFormatContext *s)

  627. {

  628.     RTSPState *rt = s->priv_data;

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

  630.     char uri[500];

  631.     int port;

  632.     int default_port = RTSP_DEFAULT_PORT;

  633.     char tcpname[500];

  634.     const char *lower_proto = "tcp";

  635.     unsigned char rbuf[4096];

  636.     unsigned char method[10];

  637.     int rbuflen = 0;

  638.     int ret;

  639.     enum RTSPMethod methodcode;

  640. 

  641.     /* extract hostname and port */

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

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

  644. 

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

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

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

  648. 

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

  650.         lower_proto  = "tls";

  651.         default_port = RTSPS_DEFAULT_PORT;

  652.     }

  653. 

  654.     if (port < 0)

  655.         port = default_port;

  656. 

  657.     /* Create TCP connection */

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

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

  660. 

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

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

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

  664.         return ret;

  665.     }

  666.     rt->state       = RTSP_STATE_IDLE;

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

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

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

  670.         if (ret < 0)

  671.             return ret;

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

  673.                                  sizeof(method), &methodcode);

  674.         if (ret) {

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

  676.             return ret;

  677.         }

  678. 

  679.         if (methodcode == ANNOUNCE) {

  680.             ret       = rtsp_read_announce(s);

  681.             rt->state = RTSP_STATE_PAUSED;

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

  683.             ret = rtsp_read_options(s);

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

  685.             ret = rtsp_read_record(s);

  686.             if (!ret)

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

  688.         } else if (methodcode == SETUP)

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

  690.         if (ret) {

  691.             ffurl_close(rt->rtsp_hd);

  692.             return AVERROR_INVALIDDATA;

  693.         }

  694.     }

  695.     return 0;

  696. }

  697. 

  698. static int rtsp_probe(AVProbeData *p)

  699. {

  700.     if (

  701. #if CONFIG_TLS_PROTOCOL

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

  703. #endif

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

  705.         return AVPROBE_SCORE_MAX;

  706.     return 0;

  707. }

  708. 

  709. static int rtsp_read_header(AVFormatContext *s)

  710. {

  711.     RTSPState *rt = s->priv_data;

  712.     int ret;

  713. 

  714.     if (rt->initial_timeout > 0)

  715.         rt->rtsp_flags |= RTSP_FLAG_LISTEN;

  716. 

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

  718.         ret = rtsp_listen(s);

  719.         if (ret)

  720.             return ret;

  721.     } else {

  722.         ret = ff_rtsp_connect(s);

  723.         if (ret)

  724.             return ret;

  725. 

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

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

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

  729.             return AVERROR(ENOMEM);

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

  731. 

  732.         if (rt->initial_pause) {

  733.             /* do not start immediately */

  734.         } else {

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

  736.                 ff_rtsp_close_streams(s);

  737.                 ff_rtsp_close_connections(s);

  738.                 return AVERROR_INVALIDDATA;

  739.             }

  740.         }

  741.     }

  742. 

  743.     return 0;

  744. }

  745. 

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

  747.                             uint8_t *buf, int buf_size)

  748. {

  749.     RTSPState *rt = s->priv_data;

  750.     int id, len, i, ret;

  751.     RTSPStream *rtsp_st;

  752. 

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

  754. redo:

  755.     for (;;) {

  756.         RTSPMessageHeader reply;

  757. 

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

  759.         if (ret < 0)

  760.             return ret;

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

  762.             break;

  763.         /* XXX: parse message */

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

  765.             return 0;

  766.     }

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

  768.     if (ret != 3)

  769.         return -1;

  770.     id  = buf[0];

  771.     len = AV_RB16(buf + 1);

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

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

  774.         goto redo;

  775.     /* get the data */

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

  777.     if (ret != len)

  778.         return -1;

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

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

  781.         return -1;

  782. 

  783.     /* find the matching stream */

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

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

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

  787.             id <= rtsp_st->interleaved_max)

  788.             goto found;

  789.     }

  790.     goto redo;

  791. found:

  792.     *prtsp_st = rtsp_st;

  793.     return len;

  794. }

  795. 

  796. static int resetup_tcp(AVFormatContext *s)

  797. {

  798.     RTSPState *rt = s->priv_data;

  799.     char host[1024];

  800.     int port;

  801. 

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

  803.                  s->filename);

  804.     ff_rtsp_undo_setup(s, 0);

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

  806.                                       rt->real_challenge);

  807. }

  808. 

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

  810. {

  811.     RTSPState *rt = s->priv_data;

  812.     int ret;

  813.     RTSPMessageHeader reply1, *reply = &reply1;

  814.     char cmd[1024];

  815. 

  816. retry:

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

  818.         int i;

  819. 

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

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

  822. 

  823.         if (!rt->need_subscription) {

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

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

  826.                 snprintf(cmd, sizeof(cmd),

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

  828.                          rt->last_subscription);

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

  830.                                  cmd, reply, NULL);

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

  832.                     return AVERROR_INVALIDDATA;

  833.                 rt->need_subscription = 1;

  834.             }

  835.         }

  836. 

  837.         if (rt->need_subscription) {

  838.             int r, rule_nr, first = 1;

  839. 

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

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

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

  843. 

  844.             snprintf(cmd, sizeof(cmd),

  845.                      "Subscribe: ");

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

  847.                 rule_nr = 0;

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

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

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

  851.                             if (!first)

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

  853.                                            sizeof(rt->last_subscription));

  854.                             ff_rdt_subscribe_rule(

  855.                                 rt->last_subscription,

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

  857.                             first = 0;

  858.                         }

  859.                         rule_nr++;

  860.                     }

  861.                 }

  862.             }

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

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

  865.                              cmd, reply, NULL);

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

  867.                 return AVERROR_INVALIDDATA;

  868.             rt->need_subscription = 0;

  869. 

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

  871.                 rtsp_read_play (s);

  872.         }

  873.     }

  874. 

  875.     ret = ff_rtsp_fetch_packet(s, pkt);

  876.     if (ret < 0) {

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

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

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

  880.                 RTSPMessageHeader reply1, *reply = &reply1;

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

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

  883.                     return -1;

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

  885.                 // other servers close the connection.

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

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

  888.                                      reply, NULL);

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

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

  891.                     rt->state = RTSP_STATE_IDLE;

  892.                     rt->need_subscription = 1;

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

  894.                         return -1;

  895.                     goto retry;

  896.                 }

  897.             }

  898.         }

  899.         return ret;

  900.     }

  901.     rt->packets++;

  902. 

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

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

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

  906.             rt->auth_state.stale) {

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

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

  909.                  rt->get_parameter_supported)) {

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

  911.             } else {

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

  913.             }

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

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

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

  917.             rt->auth_state.stale = 0;

  918.         }

  919.     }

  920. 

  921.     return 0;

  922. }

  923. 

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

  925.                           int64_t timestamp, int flags)

  926. {

  927.     RTSPState *rt = s->priv_data;

  928. 

  929.     rt->seek_timestamp = av_rescale_q(timestamp,

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

  931.                                       AV_TIME_BASE_Q);

  932.     switch(rt->state) {

  933.     default:

  934.     case RTSP_STATE_IDLE:

  935.         break;

  936.     case RTSP_STATE_STREAMING:

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

  938.             return -1;

  939.         rt->state = RTSP_STATE_SEEKING;

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

  941.             return -1;

  942.         break;

  943.     case RTSP_STATE_PAUSED:

  944.         rt->state = RTSP_STATE_IDLE;

  945.         break;

  946.     }

  947.     return 0;

  948. }

  949. 

  950. static const AVClass rtsp_demuxer_class = {

  951.     .class_name     = "RTSP demuxer",

  952.     .item_name      = av_default_item_name,

  953.     .option         = ff_rtsp_options,

  954.     .version        = LIBAVUTIL_VERSION_INT,

  955. };

  956. 

  957. AVInputFormat ff_rtsp_demuxer = {

  958.     .name           = "rtsp",

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

  960.     .priv_data_size = sizeof(RTSPState),

  961.     .read_probe     = rtsp_probe,

  962.     .read_header    = rtsp_read_header,

  963.     .read_packet    = rtsp_read_packet,

  964.     .read_close     = rtsp_read_close,

  965.     .read_seek      = rtsp_read_seek,

  966.     .flags          = AVFMT_NOFILE,

  967.     .read_play      = rtsp_read_play,

  968.     .read_pause     = rtsp_read_pause,

  969.     .priv_class     = &rtsp_demuxer_class,

  970. };