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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 "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[MAX_URL_SIZE];

  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[MAX_URL_SIZE];

  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[SDP_MAX_SIZE];

  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[MAX_URL_SIZE];

  236.     RTSPStream *rtsp_st;

  237.     char responseheaders[MAX_URL_SIZE];

  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.     /* check if the stream has already been setup */

  278.     if (rtsp_st->transport_priv) {

  279.         if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT)

  280.             ff_rdt_parse_close(rtsp_st->transport_priv);

  281.         else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RTP)

  282.             ff_rtp_parse_close(rtsp_st->transport_priv);

  283.         rtsp_st->transport_priv = NULL;

  284.     }

  285.     if (rtsp_st->rtp_handle)

  286.         ffurl_closep(&rtsp_st->rtp_handle);

  287. 

  288.     if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {

  289.         rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;

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

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

  292.             return ret;

  293.         }

  294.         rtsp_st->interleaved_min = request.transports[0].interleaved_min;

  295.         rtsp_st->interleaved_max = request.transports[0].interleaved_max;

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

  297.                  "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d"

  298.                  "\r\n", request.transports[0].interleaved_min,

  299.                  request.transports[0].interleaved_max);

  300.     } else {

  301.         do {

  302.             AVDictionary *opts = NULL;

  303.             av_dict_set_int(&opts, "buffer_size", rt->buffer_size, 0);

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

  305.             av_log(s, AV_LOG_TRACE, "Opening: %s\n", url);

  306.             ret = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,

  307.                                        &s->interrupt_callback, &opts,

  308.                                        s->protocol_whitelist, s->protocol_blacklist, NULL);

  309.             av_dict_free(&opts);

  310.             if (ret)

  311.                 localport += 2;

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

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

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

  315.             return ret;

  316.         }

  317. 

  318.         av_log(s, AV_LOG_TRACE, "Listening on: %d\n",

  319.                 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));

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

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

  322.             return ret;

  323.         }

  324. 

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

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

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

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

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

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

  331.                  localport + 1);

  332.     }

  333. 

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

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

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

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

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

  339. 

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

  341.                 rt->session_id);

  342.     /* Send Reply */

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

  344. 

  345.     rt->state = RTSP_STATE_PAUSED;

  346.     return 0;

  347. }

  348. 

  349. static int rtsp_read_record(AVFormatContext *s)

  350. {

  351.     RTSPState *rt             = s->priv_data;

  352.     RTSPMessageHeader request = { 0 };

  353.     int ret                   = 0;

  354.     char responseheaders[MAX_URL_SIZE];

  355. 

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

  357.     if (ret)

  358.         return ret;

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

  360.     if (ret)

  361.         return ret;

  362.     rt->seq++;

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

  364.              rt->session_id);

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

  366. 

  367.     rt->state = RTSP_STATE_STREAMING;

  368.     return 0;

  369. }

  370. 

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

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

  373.                                      char *method, int methodsize,

  374.                                      enum RTSPMethod *methodcode)

  375. {

  376.     RTSPState *rt = s->priv_data;

  377.     const char *linept, *searchlinept;

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

  379. 

  380.     if (!linept) {

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

  382.         return AVERROR_INVALIDDATA;

  383.     }

  384. 

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

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

  387.         return AVERROR(EIO);

  388.     }

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

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

  391.     linept++;

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

  393.         *methodcode = ANNOUNCE;

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

  395.         *methodcode = OPTIONS;

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

  397.         *methodcode = RECORD;

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

  399.         *methodcode = SETUP;

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

  401.         *methodcode = PAUSE;

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

  403.         *methodcode = TEARDOWN;

  404.     else

  405.         *methodcode = UNKNOWN;

  406.     /* Check method with the state  */

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

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

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

  410.                    line);

  411.             return AVERROR_PROTOCOL_NOT_FOUND;

  412.         }

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

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

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

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

  417.                    line);

  418.             return AVERROR_PROTOCOL_NOT_FOUND;

  419.         }

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

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

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

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

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

  425.             return AVERROR_PROTOCOL_NOT_FOUND;

  426.         }

  427.     } else {

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

  429.         return AVERROR_BUG;

  430.     }

  431. 

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

  433.     if (!searchlinept) {

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

  435.         return AVERROR_INVALIDDATA;

  436.     }

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

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

  439.         return AVERROR(EIO);

  440.     }

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

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

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

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

  445.         int port;

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

  447.         int ctl_port;

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

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

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

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

  452.                      rt->control_uri);

  453.         if (strcmp(host, ctl_host))

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

  455.                    host, ctl_host);

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

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

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

  459.         if (*methodcode == ANNOUNCE) {

  460.             av_log(s, AV_LOG_INFO,

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

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

  463.         }

  464.     }

  465. 

  466.     linept = searchlinept + 1;

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

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

  469.         return AVERROR_PROTOCOL_NOT_FOUND;

  470.     }

  471.     return 0;

  472. }

  473. 

  474. int ff_rtsp_parse_streaming_commands(AVFormatContext *s)

  475. {

  476.     RTSPState *rt = s->priv_data;

  477.     unsigned char rbuf[MAX_URL_SIZE];

  478.     unsigned char method[10];

  479.     char uri[500];

  480.     int ret;

  481.     int rbuflen               = 0;

  482.     RTSPMessageHeader request = { 0 };

  483.     enum RTSPMethod methodcode;

  484. 

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

  486.     if (ret < 0)

  487.         return ret;

  488.     av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);

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

  490.                              sizeof(method), &methodcode);

  491.     if (ret) {

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

  493.         return ret;

  494.     }

  495. 

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

  497.     if (ret)

  498.         return ret;

  499.     rt->seq++;

  500.     if (methodcode == PAUSE) {

  501.         rt->state = RTSP_STATE_PAUSED;

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

  503.         // TODO: Missing date header in response

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

  505.         ret = rtsp_send_reply(s, RTSP_STATUS_OK,

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

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

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

  509.         rt->state = RTSP_STATE_IDLE;

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

  511.     }

  512.     return ret;

  513. }

  514. 

  515. static int rtsp_read_play(AVFormatContext *s)

  516. {

  517.     RTSPState *rt = s->priv_data;

  518.     RTSPMessageHeader reply1, *reply = &reply1;

  519.     int i;

  520.     char cmd[MAX_URL_SIZE];

  521. 

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

  523.     rt->nb_byes = 0;

  524. 

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

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

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

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

  529.              * potential NAT router by sending dummy packets.

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

  531.              */

  532.             if (rtsp_st->rtp_handle &&

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

  534.                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);

  535.         }

  536.     }

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

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

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

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

  541.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  542.                 if (!rtpctx)

  543.                     continue;

  544.                 ff_rtp_reset_packet_queue(rtpctx);

  545.                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;

  546.                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;

  547.                 rtpctx->base_timestamp      = 0;

  548.                 rtpctx->timestamp           = 0;

  549.                 rtpctx->unwrapped_timestamp = 0;

  550.                 rtpctx->rtcp_ts_offset      = 0;

  551.             }

  552.         }

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

  554.             cmd[0] = 0;

  555.         } else {

  556.             snprintf(cmd, sizeof(cmd),

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

  558.                      rt->seek_timestamp / AV_TIME_BASE,

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

  560.         }

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

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

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

  564.         }

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

  566.             reply->range_start != AV_NOPTS_VALUE) {

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

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

  569.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  570.                 AVStream *st = NULL;

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

  572.                     continue;

  573. 

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

  575.                 rtpctx->range_start_offset =

  576.                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,

  577.                                  st->time_base);

  578.             }

  579.         }

  580.     }

  581.     rt->state = RTSP_STATE_STREAMING;

  582.     return 0;

  583. }

  584. 

  585. /* pause the stream */

  586. static int rtsp_read_pause(AVFormatContext *s)

  587. {

  588.     RTSPState *rt = s->priv_data;

  589.     RTSPMessageHeader reply1, *reply = &reply1;

  590. 

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

  592.         return 0;

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

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

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

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

  597.         }

  598.     }

  599.     rt->state = RTSP_STATE_PAUSED;

  600.     return 0;

  601. }

  602. 

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

  604. {

  605.     RTSPState *rt = s->priv_data;

  606.     char cmd[MAX_URL_SIZE];

  607.     unsigned char *content = NULL;

  608.     int ret;

  609. 

  610.     /* describe the stream */

  611.     snprintf(cmd, sizeof(cmd),

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

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

  614.         /**

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

  616.          * Realmedia servers.

  617.          */

  618.         av_strlcat(cmd,

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

  620.                    sizeof(cmd));

  621.     }

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

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

  624.         av_freep(&content);

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

  626.     }

  627.     if (!content)

  628.         return AVERROR_INVALIDDATA;

  629. 

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

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

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

  633.     av_freep(&content);

  634.     if (ret < 0)

  635.         return ret;

  636. 

  637.     return 0;

  638. }

  639. 

  640. static int rtsp_listen(AVFormatContext *s)

  641. {

  642.     RTSPState *rt = s->priv_data;

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

  644.     char uri[500];

  645.     int port;

  646.     int default_port = RTSP_DEFAULT_PORT;

  647.     char tcpname[500];

  648.     const char *lower_proto = "tcp";

  649.     unsigned char rbuf[MAX_URL_SIZE];

  650.     unsigned char method[10];

  651.     int rbuflen = 0;

  652.     int ret;

  653.     enum RTSPMethod methodcode;

  654. 

  655.     if (!ff_network_init())

  656.         return AVERROR(EIO);

  657. 

  658.     /* extract hostname and port */

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

  660.                  &port, path, sizeof(path), s->url);

  661. 

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

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

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

  665. 

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

  667.         lower_proto  = "tls";

  668.         default_port = RTSPS_DEFAULT_PORT;

  669.     }

  670. 

  671.     if (port < 0)

  672.         port = default_port;

  673. 

  674.     /* Create TCP connection */

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

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

  677. 

  678.     if (ret = ffurl_open_whitelist(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,

  679.                                    &s->interrupt_callback, NULL,

  680.                                    s->protocol_whitelist, s->protocol_blacklist, NULL)) {

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

  682.         goto fail;

  683.     }

  684.     rt->state       = RTSP_STATE_IDLE;

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

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

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

  688.         if (ret < 0)

  689.             goto fail;

  690.         av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);

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

  692.                                  sizeof(method), &methodcode);

  693.         if (ret) {

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

  695.             goto fail;

  696.         }

  697. 

  698.         if (methodcode == ANNOUNCE) {

  699.             ret       = rtsp_read_announce(s);

  700.             rt->state = RTSP_STATE_PAUSED;

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

  702.             ret = rtsp_read_options(s);

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

  704.             ret = rtsp_read_record(s);

  705.             if (!ret)

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

  707.         } else if (methodcode == SETUP)

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

  709.         if (ret) {

  710.             ret = AVERROR_INVALIDDATA;

  711.             goto fail;

  712.         }

  713.     }

  714. fail:

  715.     ff_rtsp_close_streams(s);

  716.     ff_rtsp_close_connections(s);

  717.     ff_network_close();

  718.     return ret;

  719. }

  720. 

  721. static int rtsp_probe(const AVProbeData *p)

  722. {

  723.     if (

  724. #if CONFIG_TLS_PROTOCOL

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

  726. #endif

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

  728.         return AVPROBE_SCORE_MAX;

  729.     return 0;

  730. }

  731. 

  732. static int rtsp_read_header(AVFormatContext *s)

  733. {

  734.     RTSPState *rt = s->priv_data;

  735.     int ret;

  736. 

  737.     if (rt->initial_timeout > 0)

  738.         rt->rtsp_flags |= RTSP_FLAG_LISTEN;

  739. 

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

  741.         ret = rtsp_listen(s);

  742.         if (ret)

  743.             return ret;

  744.     } else {

  745.         ret = ff_rtsp_connect(s);

  746.         if (ret)

  747.             return ret;

  748. 

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

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

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

  752.             ret = AVERROR(ENOMEM);

  753.             goto fail;

  754.         }

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

  756. 

  757.         if (rt->initial_pause) {

  758.             /* do not start immediately */

  759.         } else {

  760.             ret = rtsp_read_play(s);

  761.             if (ret < 0)

  762.                 goto fail;

  763.         }

  764.     }

  765. 

  766.     return 0;

  767. 

  768. fail:

  769.     rtsp_read_close(s);

  770.     return ret;

  771. }

  772. 

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

  774.                             uint8_t *buf, int buf_size)

  775. {

  776.     RTSPState *rt = s->priv_data;

  777.     int id, len, i, ret;

  778.     RTSPStream *rtsp_st;

  779. 

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

  781. redo:

  782.     for (;;) {

  783.         RTSPMessageHeader reply;

  784. 

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

  786.         if (ret < 0)

  787.             return ret;

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

  789.             break;

  790.         /* XXX: parse message */

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

  792.             return 0;

  793.     }

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

  795.     if (ret != 3)

  796.         return AVERROR(EIO);

  797.     id  = buf[0];

  798.     len = AV_RB16(buf + 1);

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

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

  801.         goto redo;

  802.     /* get the data */

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

  804.     if (ret != len)

  805.         return AVERROR(EIO);

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

  807.         (ret = ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL)) < 0)

  808.         return ret;

  809. 

  810.     /* find the matching stream */

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

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

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

  814.             id <= rtsp_st->interleaved_max)

  815.             goto found;

  816.     }

  817.     goto redo;

  818. found:

  819.     *prtsp_st = rtsp_st;

  820.     return len;

  821. }

  822. 

  823. static int resetup_tcp(AVFormatContext *s)

  824. {

  825.     RTSPState *rt = s->priv_data;

  826.     char host[1024];

  827.     int port;

  828. 

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

  830.                  s->url);

  831.     ff_rtsp_undo_setup(s, 0);

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

  833.                                       rt->real_challenge);

  834. }

  835. 

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

  837. {

  838.     RTSPState *rt = s->priv_data;

  839.     int ret;

  840.     RTSPMessageHeader reply1, *reply = &reply1;

  841.     char cmd[MAX_URL_SIZE];

  842. 

  843. retry:

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

  845.         int i;

  846. 

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

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

  849. 

  850.         if (!rt->need_subscription) {

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

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

  853.                 snprintf(cmd, sizeof(cmd),

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

  855.                          rt->last_subscription);

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

  857.                                  cmd, reply, NULL);

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

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

  860.                 rt->need_subscription = 1;

  861.             }

  862.         }

  863. 

  864.         if (rt->need_subscription) {

  865.             int r, rule_nr, first = 1;

  866. 

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

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

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

  870. 

  871.             snprintf(cmd, sizeof(cmd),

  872.                      "Subscribe: ");

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

  874.                 rule_nr = 0;

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

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

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

  878.                             if (!first)

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

  880.                                            sizeof(rt->last_subscription));

  881.                             ff_rdt_subscribe_rule(

  882.                                 rt->last_subscription,

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

  884.                             first = 0;

  885.                         }

  886.                         rule_nr++;

  887.                     }

  888.                 }

  889.             }

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

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

  892.                              cmd, reply, NULL);

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

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

  895.             rt->need_subscription = 0;

  896. 

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

  898.                 rtsp_read_play (s);

  899.         }

  900.     }

  901. 

  902.     ret = ff_rtsp_fetch_packet(s, pkt);

  903.     if (ret < 0) {

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

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

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

  907.                 RTSPMessageHeader reply1, *reply = &reply1;

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

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

  910.                     return -1;

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

  912.                 // other servers close the connection.

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

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

  915.                                      reply, NULL);

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

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

  918.                     rt->state = RTSP_STATE_IDLE;

  919.                     rt->need_subscription = 1;

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

  921.                         return -1;

  922.                     goto retry;

  923.                 }

  924.             }

  925.         }

  926.         return ret;

  927.     }

  928.     rt->packets++;

  929. 

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

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

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

  933.             rt->auth_state.stale) {

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

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

  936.                  rt->get_parameter_supported)) {

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

  938.             } else {

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

  940.             }

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

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

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

  944.             rt->auth_state.stale = 0;

  945.         }

  946.     }

  947. 

  948.     return 0;

  949. }

  950. 

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

  952.                           int64_t timestamp, int flags)

  953. {

  954.     RTSPState *rt = s->priv_data;

  955.     int ret;

  956. 

  957.     rt->seek_timestamp = av_rescale_q(timestamp,

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

  959.                                       AV_TIME_BASE_Q);

  960.     switch(rt->state) {

  961.     default:

  962.     case RTSP_STATE_IDLE:

  963.         break;

  964.     case RTSP_STATE_STREAMING:

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

  966.             return ret;

  967.         rt->state = RTSP_STATE_SEEKING;

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

  969.             return ret;

  970.         break;

  971.     case RTSP_STATE_PAUSED:

  972.         rt->state = RTSP_STATE_IDLE;

  973.         break;

  974.     }

  975.     return 0;

  976. }

  977. 

  978. static const AVClass rtsp_demuxer_class = {

  979.     .class_name     = "RTSP demuxer",

  980.     .item_name      = av_default_item_name,

  981.     .option         = ff_rtsp_options,

  982.     .version        = LIBAVUTIL_VERSION_INT,

  983. };

  984. 

  985. AVInputFormat ff_rtsp_demuxer = {

  986.     .name           = "rtsp",

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

  988.     .priv_data_size = sizeof(RTSPState),

  989.     .read_probe     = rtsp_probe,

  990.     .read_header    = rtsp_read_header,

  991.     .read_packet    = rtsp_read_packet,

  992.     .read_close     = rtsp_read_close,

  993.     .read_seek      = rtsp_read_seek,

  994.     .flags          = AVFMT_NOFILE,

  995.     .read_play      = rtsp_read_play,

  996.     .read_pause     = rtsp_read_pause,

  997.     .priv_class     = &rtsp_demuxer_class,

  998. };