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

  371.         return AVERROR_INVALIDDATA;

  372.     }

  373. 

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

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

  376.         return AVERROR(EIO);

  377.     }

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

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

  380.     linept++;

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

  382.         *methodcode = ANNOUNCE;

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

  384.         *methodcode = OPTIONS;

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

  386.         *methodcode = RECORD;

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

  388.         *methodcode = SETUP;

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

  390.         *methodcode = PAUSE;

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

  392.         *methodcode = TEARDOWN;

  393.     else

  394.         *methodcode = UNKNOWN;

  395.     /* Check method with the state  */

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

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

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

  399.                    line);

  400.             return AVERROR_PROTOCOL_NOT_FOUND;

  401.         }

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

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

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

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

  406.                    line);

  407.             return AVERROR_PROTOCOL_NOT_FOUND;

  408.         }

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

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

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

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

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

  414.             return AVERROR_PROTOCOL_NOT_FOUND;

  415.         }

  416.     } else {

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

  418.         return AVERROR_BUG;

  419.     }

  420. 

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

  422.     if (!searchlinept) {

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

  424.         return AVERROR_INVALIDDATA;

  425.     }

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

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

  428.         return AVERROR(EIO);

  429.     }

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

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

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

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

  434.         int port;

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

  436.         int ctl_port;

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

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

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

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

  441.                      rt->control_uri);

  442.         if (strcmp(host, ctl_host))

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

  444.                    host, ctl_host);

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

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

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

  448.         if (*methodcode == ANNOUNCE) {

  449.             av_log(s, AV_LOG_INFO,

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

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

  452.         }

  453.     }

  454. 

  455.     linept = searchlinept + 1;

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

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

  458.         return AVERROR_PROTOCOL_NOT_FOUND;

  459.     }

  460.     return 0;

  461. }

  462. 

  463. int ff_rtsp_parse_streaming_commands(AVFormatContext *s)

  464. {

  465.     RTSPState *rt = s->priv_data;

  466.     unsigned char rbuf[4096];

  467.     unsigned char method[10];

  468.     char uri[500];

  469.     int ret;

  470.     int rbuflen               = 0;

  471.     RTSPMessageHeader request = { 0 };

  472.     enum RTSPMethod methodcode;

  473. 

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

  475.     if (ret < 0)

  476.         return ret;

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

  478.                              sizeof(method), &methodcode);

  479.     if (ret) {

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

  481.         return ret;

  482.     }

  483. 

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

  485.     if (ret)

  486.         return ret;

  487.     rt->seq++;

  488.     if (methodcode == PAUSE) {

  489.         rt->state = RTSP_STATE_PAUSED;

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

  491.         // TODO: Missing date header in response

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

  493.         ret = rtsp_send_reply(s, RTSP_STATUS_OK,

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

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

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

  497.         rt->state = RTSP_STATE_IDLE;

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

  499.         return 0;

  500.     }

  501.     return ret;

  502. }

  503. 

  504. static int rtsp_read_play(AVFormatContext *s)

  505. {

  506.     RTSPState *rt = s->priv_data;

  507.     RTSPMessageHeader reply1, *reply = &reply1;

  508.     int i;

  509.     char cmd[1024];

  510. 

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

  512.     rt->nb_byes = 0;

  513. 

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

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

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

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

  518.              * potential NAT router by sending dummy packets.

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

  520.              */

  521.             if (rtsp_st->rtp_handle &&

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

  523.                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);

  524.         }

  525.     }

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

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

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

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

  530.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  531.                 if (!rtpctx)

  532.                     continue;

  533.                 ff_rtp_reset_packet_queue(rtpctx);

  534.                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;

  535.                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;

  536.                 rtpctx->base_timestamp      = 0;

  537.                 rtpctx->timestamp           = 0;

  538.                 rtpctx->unwrapped_timestamp = 0;

  539.                 rtpctx->rtcp_ts_offset      = 0;

  540.             }

  541.         }

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

  543.             cmd[0] = 0;

  544.         } else {

  545.             snprintf(cmd, sizeof(cmd),

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

  547.                      rt->seek_timestamp / AV_TIME_BASE,

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

  549.         }

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

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

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

  553.         }

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

  555.             reply->range_start != AV_NOPTS_VALUE) {

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

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

  558.                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;

  559.                 AVStream *st = NULL;

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

  561.                     continue;

  562. 

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

  564.                 rtpctx->range_start_offset =

  565.                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,

  566.                                  st->time_base);

  567.             }

  568.         }

  569.     }

  570.     rt->state = RTSP_STATE_STREAMING;

  571.     return 0;

  572. }

  573. 

  574. /* pause the stream */

  575. static int rtsp_read_pause(AVFormatContext *s)

  576. {

  577.     RTSPState *rt = s->priv_data;

  578.     RTSPMessageHeader reply1, *reply = &reply1;

  579. 

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

  581.         return 0;

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

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

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

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

  586.         }

  587.     }

  588.     rt->state = RTSP_STATE_PAUSED;

  589.     return 0;

  590. }

  591. 

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

  593. {

  594.     RTSPState *rt = s->priv_data;

  595.     char cmd[1024];

  596.     unsigned char *content = NULL;

  597.     int ret;

  598. 

  599.     /* describe the stream */

  600.     snprintf(cmd, sizeof(cmd),

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

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

  603.         /**

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

  605.          * Realmedia servers.

  606.          */

  607.         av_strlcat(cmd,

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

  609.                    sizeof(cmd));

  610.     }

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

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

  613.         av_freep(&content);

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

  615.     }

  616.     if (!content)

  617.         return AVERROR_INVALIDDATA;

  618. 

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

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

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

  622.     av_freep(&content);

  623.     if (ret < 0)

  624.         return ret;

  625. 

  626.     return 0;

  627. }

  628. 

  629. static int rtsp_listen(AVFormatContext *s)

  630. {

  631.     RTSPState *rt = s->priv_data;

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

  633.     char uri[500];

  634.     int port;

  635.     int default_port = RTSP_DEFAULT_PORT;

  636.     char tcpname[500];

  637.     const char *lower_proto = "tcp";

  638.     unsigned char rbuf[4096];

  639.     unsigned char method[10];

  640.     int rbuflen = 0;

  641.     int ret;

  642.     enum RTSPMethod methodcode;

  643. 

  644.     /* extract hostname and port */

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

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

  647. 

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

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

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

  651. 

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

  653.         lower_proto  = "tls";

  654.         default_port = RTSPS_DEFAULT_PORT;

  655.     }

  656. 

  657.     if (port < 0)

  658.         port = default_port;

  659. 

  660.     /* Create TCP connection */

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

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

  663. 

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

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

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

  667.         return ret;

  668.     }

  669.     rt->state       = RTSP_STATE_IDLE;

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

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

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

  673.         if (ret < 0)

  674.             return ret;

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

  676.                                  sizeof(method), &methodcode);

  677.         if (ret) {

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

  679.             return ret;

  680.         }

  681. 

  682.         if (methodcode == ANNOUNCE) {

  683.             ret       = rtsp_read_announce(s);

  684.             rt->state = RTSP_STATE_PAUSED;

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

  686.             ret = rtsp_read_options(s);

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

  688.             ret = rtsp_read_record(s);

  689.             if (!ret)

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

  691.         } else if (methodcode == SETUP)

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

  693.         if (ret) {

  694.             ffurl_close(rt->rtsp_hd);

  695.             return AVERROR_INVALIDDATA;

  696.         }

  697.     }

  698.     return 0;

  699. }

  700. 

  701. static int rtsp_probe(AVProbeData *p)

  702. {

  703.     if (

  704. #if CONFIG_TLS_PROTOCOL

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

  706. #endif

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

  708.         return AVPROBE_SCORE_MAX;

  709.     return 0;

  710. }

  711. 

  712. static int rtsp_read_header(AVFormatContext *s)

  713. {

  714.     RTSPState *rt = s->priv_data;

  715.     int ret;

  716. 

  717.     if (rt->initial_timeout > 0)

  718.         rt->rtsp_flags |= RTSP_FLAG_LISTEN;

  719. 

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

  721.         ret = rtsp_listen(s);

  722.         if (ret)

  723.             return ret;

  724.     } else {

  725.         ret = ff_rtsp_connect(s);

  726.         if (ret)

  727.             return ret;

  728. 

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

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

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

  732.             return AVERROR(ENOMEM);

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

  734. 

  735.         if (rt->initial_pause) {

  736.             /* do not start immediately */

  737.         } else {

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

  739.                 ff_rtsp_close_streams(s);

  740.                 ff_rtsp_close_connections(s);

  741.                 return ret;

  742.             }

  743.         }

  744.     }

  745. 

  746.     return 0;

  747. }

  748. 

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

  750.                             uint8_t *buf, int buf_size)

  751. {

  752.     RTSPState *rt = s->priv_data;

  753.     int id, len, i, ret;

  754.     RTSPStream *rtsp_st;

  755. 

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

  757. redo:

  758.     for (;;) {

  759.         RTSPMessageHeader reply;

  760. 

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

  762.         if (ret < 0)

  763.             return ret;

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

  765.             break;

  766.         /* XXX: parse message */

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

  768.             return 0;

  769.     }

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

  771.     if (ret != 3)

  772.         return -1;

  773.     id  = buf[0];

  774.     len = AV_RB16(buf + 1);

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

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

  777.         goto redo;

  778.     /* get the data */

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

  780.     if (ret != len)

  781.         return -1;

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

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

  784.         return -1;

  785. 

  786.     /* find the matching stream */

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

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

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

  790.             id <= rtsp_st->interleaved_max)

  791.             goto found;

  792.     }

  793.     goto redo;

  794. found:

  795.     *prtsp_st = rtsp_st;

  796.     return len;

  797. }

  798. 

  799. static int resetup_tcp(AVFormatContext *s)

  800. {

  801.     RTSPState *rt = s->priv_data;

  802.     char host[1024];

  803.     int port;

  804. 

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

  806.                  s->filename);

  807.     ff_rtsp_undo_setup(s, 0);

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

  809.                                       rt->real_challenge);

  810. }

  811. 

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

  813. {

  814.     RTSPState *rt = s->priv_data;

  815.     int ret;

  816.     RTSPMessageHeader reply1, *reply = &reply1;

  817.     char cmd[1024];

  818. 

  819. retry:

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

  821.         int i;

  822. 

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

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

  825. 

  826.         if (!rt->need_subscription) {

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

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

  829.                 snprintf(cmd, sizeof(cmd),

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

  831.                          rt->last_subscription);

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

  833.                                  cmd, reply, NULL);

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

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

  836.                 rt->need_subscription = 1;

  837.             }

  838.         }

  839. 

  840.         if (rt->need_subscription) {

  841.             int r, rule_nr, first = 1;

  842. 

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

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

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

  846. 

  847.             snprintf(cmd, sizeof(cmd),

  848.                      "Subscribe: ");

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

  850.                 rule_nr = 0;

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

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

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

  854.                             if (!first)

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

  856.                                            sizeof(rt->last_subscription));

  857.                             ff_rdt_subscribe_rule(

  858.                                 rt->last_subscription,

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

  860.                             first = 0;

  861.                         }

  862.                         rule_nr++;

  863.                     }

  864.                 }

  865.             }

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

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

  868.                              cmd, reply, NULL);

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

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

  871.             rt->need_subscription = 0;

  872. 

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

  874.                 rtsp_read_play (s);

  875.         }

  876.     }

  877. 

  878.     ret = ff_rtsp_fetch_packet(s, pkt);

  879.     if (ret < 0) {

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

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

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

  883.                 RTSPMessageHeader reply1, *reply = &reply1;

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

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

  886.                     return -1;

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

  888.                 // other servers close the connection.

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

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

  891.                                      reply, NULL);

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

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

  894.                     rt->state = RTSP_STATE_IDLE;

  895.                     rt->need_subscription = 1;

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

  897.                         return -1;

  898.                     goto retry;

  899.                 }

  900.             }

  901.         }

  902.         return ret;

  903.     }

  904.     rt->packets++;

  905. 

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

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

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

  909.             rt->auth_state.stale) {

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

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

  912.                  rt->get_parameter_supported)) {

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

  914.             } else {

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

  916.             }

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

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

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

  920.             rt->auth_state.stale = 0;

  921.         }

  922.     }

  923. 

  924.     return 0;

  925. }

  926. 

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

  928.                           int64_t timestamp, int flags)

  929. {

  930.     RTSPState *rt = s->priv_data;

  931.     int ret;

  932. 

  933.     rt->seek_timestamp = av_rescale_q(timestamp,

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

  935.                                       AV_TIME_BASE_Q);

  936.     switch(rt->state) {

  937.     default:

  938.     case RTSP_STATE_IDLE:

  939.         break;

  940.     case RTSP_STATE_STREAMING:

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

  942.             return ret;

  943.         rt->state = RTSP_STATE_SEEKING;

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

  945.             return ret;

  946.         break;

  947.     case RTSP_STATE_PAUSED:

  948.         rt->state = RTSP_STATE_IDLE;

  949.         break;

  950.     }

  951.     return 0;

  952. }

  953. 

  954. static const AVClass rtsp_demuxer_class = {

  955.     .class_name     = "RTSP demuxer",

  956.     .item_name      = av_default_item_name,

  957.     .option         = ff_rtsp_options,

  958.     .version        = LIBAVUTIL_VERSION_INT,

  959. };

  960. 

  961. AVInputFormat ff_rtsp_demuxer = {

  962.     .name           = "rtsp",

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

  964.     .priv_data_size = sizeof(RTSPState),

  965.     .read_probe     = rtsp_probe,

  966.     .read_header    = rtsp_read_header,

  967.     .read_packet    = rtsp_read_packet,

  968.     .read_close     = rtsp_read_close,

  969.     .read_seek      = rtsp_read_seek,

  970.     .flags          = AVFMT_NOFILE,

  971.     .read_play      = rtsp_read_play,

  972.     .read_pause     = rtsp_read_pause,

  973.     .priv_class     = &rtsp_demuxer_class,

  974. };