yading@11: /*
yading@11:  * RTSP demuxer
yading@11:  * Copyright (c) 2002 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/mathematics.h"
yading@11: #include "libavutil/random_seed.h"
yading@11: #include "libavutil/time.h"
yading@11: #include "avformat.h"
yading@11: 
yading@11: #include "internal.h"
yading@11: #include "network.h"
yading@11: #include "os_support.h"
yading@11: #include "rtsp.h"
yading@11: #include "rdt.h"
yading@11: #include "url.h"
yading@11: 
yading@11: static const struct RTSPStatusMessage {
yading@11:     enum RTSPStatusCode code;
yading@11:     const char *message;
yading@11: } status_messages[] = {
yading@11:     { RTSP_STATUS_OK,             "OK"                               },
yading@11:     { RTSP_STATUS_METHOD,         "Method Not Allowed"               },
yading@11:     { RTSP_STATUS_BANDWIDTH,      "Not Enough Bandwidth"             },
yading@11:     { RTSP_STATUS_SESSION,        "Session Not Found"                },
yading@11:     { RTSP_STATUS_STATE,          "Method Not Valid in This State"   },
yading@11:     { RTSP_STATUS_AGGREGATE,      "Aggregate operation not allowed"  },
yading@11:     { RTSP_STATUS_ONLY_AGGREGATE, "Only aggregate operation allowed" },
yading@11:     { RTSP_STATUS_TRANSPORT,      "Unsupported transport"            },
yading@11:     { RTSP_STATUS_INTERNAL,       "Internal Server Error"            },
yading@11:     { RTSP_STATUS_SERVICE,        "Service Unavailable"              },
yading@11:     { RTSP_STATUS_VERSION,        "RTSP Version not supported"       },
yading@11:     { 0,                          "NULL"                             }
yading@11: };
yading@11: 
yading@11: static int rtsp_read_close(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11: 
yading@11:     if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN))
yading@11:         ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
yading@11: 
yading@11:     ff_rtsp_close_streams(s);
yading@11:     ff_rtsp_close_connections(s);
yading@11:     ff_network_close();
yading@11:     rt->real_setup = NULL;
yading@11:     av_freep(&rt->real_setup_cache);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static inline int read_line(AVFormatContext *s, char *rbuf, const int rbufsize,
yading@11:                             int *rbuflen)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     int idx       = 0;
yading@11:     int ret       = 0;
yading@11:     *rbuflen      = 0;
yading@11: 
yading@11:     do {
yading@11:         ret = ffurl_read_complete(rt->rtsp_hd, rbuf + idx, 1);
yading@11:         if (ret <= 0)
yading@11:             return ret ? ret : AVERROR_EOF;
yading@11:         if (rbuf[idx] == '\r') {
yading@11:             /* Ignore */
yading@11:         } else if (rbuf[idx] == '\n') {
yading@11:             rbuf[idx] = '\0';
yading@11:             *rbuflen  = idx;
yading@11:             return 0;
yading@11:         } else
yading@11:             idx++;
yading@11:     } while (idx < rbufsize);
yading@11:     av_log(s, AV_LOG_ERROR, "Message too long\n");
yading@11:     return AVERROR(EIO);
yading@11: }
yading@11: 
yading@11: static int rtsp_send_reply(AVFormatContext *s, enum RTSPStatusCode code,
yading@11:                            const char *extracontent, uint16_t seq)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     char message[4096];
yading@11:     int index = 0;
yading@11:     while (status_messages[index].code) {
yading@11:         if (status_messages[index].code == code) {
yading@11:             snprintf(message, sizeof(message), "RTSP/1.0 %d %s\r\n",
yading@11:                      code, status_messages[index].message);
yading@11:             break;
yading@11:         }
yading@11:         index++;
yading@11:     }
yading@11:     if (!status_messages[index].code)
yading@11:         return AVERROR(EINVAL);
yading@11:     av_strlcatf(message, sizeof(message), "CSeq: %d\r\n", seq);
yading@11:     av_strlcatf(message, sizeof(message), "Server: %s\r\n", LIBAVFORMAT_IDENT);
yading@11:     if (extracontent)
yading@11:         av_strlcat(message, extracontent, sizeof(message));
yading@11:     av_strlcat(message, "\r\n", sizeof(message));
yading@11:     av_dlog(s, "Sending response:\n%s", message);
yading@11:     ffurl_write(rt->rtsp_hd, message, strlen(message));
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static inline int check_sessionid(AVFormatContext *s,
yading@11:                                   RTSPMessageHeader *request)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     unsigned char *session_id = rt->session_id;
yading@11:     if (!session_id[0]) {
yading@11:         av_log(s, AV_LOG_WARNING, "There is no session-id at the moment\n");
yading@11:         return 0;
yading@11:     }
yading@11:     if (strcmp(session_id, request->session_id)) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unexpected session-id %s\n",
yading@11:                request->session_id);
yading@11:         rtsp_send_reply(s, RTSP_STATUS_SESSION, NULL, request->seq);
yading@11:         return AVERROR_STREAM_NOT_FOUND;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static inline int rtsp_read_request(AVFormatContext *s,
yading@11:                                     RTSPMessageHeader *request,
yading@11:                                     const char *method)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     char rbuf[1024];
yading@11:     int rbuflen, ret;
yading@11:     do {
yading@11:         ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
yading@11:         if (ret)
yading@11:             return ret;
yading@11:         if (rbuflen > 1) {
yading@11:             av_dlog(s, "Parsing[%d]: %s\n", rbuflen, rbuf);
yading@11:             ff_rtsp_parse_line(request, rbuf, rt, method);
yading@11:         }
yading@11:     } while (rbuflen > 0);
yading@11:     if (request->seq != rt->seq + 1) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unexpected Sequence number %d\n",
yading@11:                request->seq);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11:     if (rt->session_id[0] && strcmp(method, "OPTIONS")) {
yading@11:         ret = check_sessionid(s, request);
yading@11:         if (ret)
yading@11:             return ret;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rtsp_read_announce(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt             = s->priv_data;
yading@11:     RTSPMessageHeader request = { 0 };
yading@11:     char sdp[4096];
yading@11:     int  ret;
yading@11: 
yading@11:     ret = rtsp_read_request(s, &request, "ANNOUNCE");
yading@11:     if (ret)
yading@11:         return ret;
yading@11:     rt->seq++;
yading@11:     if (strcmp(request.content_type, "application/sdp")) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unexpected content type %s\n",
yading@11:                request.content_type);
yading@11:         rtsp_send_reply(s, RTSP_STATUS_SERVICE, NULL, request.seq);
yading@11:         return AVERROR_OPTION_NOT_FOUND;
yading@11:     }
yading@11:     if (request.content_length && request.content_length < sizeof(sdp) - 1) {
yading@11:         /* Read SDP */
yading@11:         if (ffurl_read_complete(rt->rtsp_hd, sdp, request.content_length)
yading@11:             < request.content_length) {
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "Unable to get complete SDP Description in ANNOUNCE\n");
yading@11:             rtsp_send_reply(s, RTSP_STATUS_INTERNAL, NULL, request.seq);
yading@11:             return AVERROR(EIO);
yading@11:         }
yading@11:         sdp[request.content_length] = '\0';
yading@11:         av_log(s, AV_LOG_VERBOSE, "SDP: %s\n", sdp);
yading@11:         ret = ff_sdp_parse(s, sdp);
yading@11:         if (ret)
yading@11:             return ret;
yading@11:         rtsp_send_reply(s, RTSP_STATUS_OK, NULL, request.seq);
yading@11:         return 0;
yading@11:     }
yading@11:     av_log(s, AV_LOG_ERROR,
yading@11:            "Content-Length header value exceeds sdp allocated buffer (4KB)\n");
yading@11:     rtsp_send_reply(s, RTSP_STATUS_INTERNAL,
yading@11:                     "Content-Length exceeds buffer size", request.seq);
yading@11:     return AVERROR(EIO);
yading@11: }
yading@11: 
yading@11: static int rtsp_read_options(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt             = s->priv_data;
yading@11:     RTSPMessageHeader request = { 0 };
yading@11:     int ret                   = 0;
yading@11: 
yading@11:     /* Parsing headers */
yading@11:     ret = rtsp_read_request(s, &request, "OPTIONS");
yading@11:     if (ret)
yading@11:         return ret;
yading@11:     rt->seq++;
yading@11:     /* Send Reply */
yading@11:     rtsp_send_reply(s, RTSP_STATUS_OK,
yading@11:                     "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, RECORD\r\n",
yading@11:                     request.seq);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
yading@11: {
yading@11:     RTSPState *rt             = s->priv_data;
yading@11:     RTSPMessageHeader request = { 0 };
yading@11:     int ret                   = 0;
yading@11:     char url[1024];
yading@11:     RTSPStream *rtsp_st;
yading@11:     char responseheaders[1024];
yading@11:     int localport    = -1;
yading@11:     int transportidx = 0;
yading@11:     int streamid     = 0;
yading@11: 
yading@11:     ret = rtsp_read_request(s, &request, "SETUP");
yading@11:     if (ret)
yading@11:         return ret;
yading@11:     rt->seq++;
yading@11:     if (!request.nb_transports) {
yading@11:         av_log(s, AV_LOG_ERROR, "No transport defined in SETUP\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     for (transportidx = 0; transportidx < request.nb_transports;
yading@11:          transportidx++) {
yading@11:         if (!request.transports[transportidx].mode_record ||
yading@11:             (request.transports[transportidx].lower_transport !=
yading@11:              RTSP_LOWER_TRANSPORT_UDP &&
yading@11:              request.transports[transportidx].lower_transport !=
yading@11:              RTSP_LOWER_TRANSPORT_TCP)) {
yading@11:             av_log(s, AV_LOG_ERROR, "mode=record/receive not set or transport"
yading@11:                    " protocol not supported (yet)\n");
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:     }
yading@11:     if (request.nb_transports > 1)
yading@11:         av_log(s, AV_LOG_WARNING, "More than one transport not supported, "
yading@11:                "using first of all\n");
yading@11:     for (streamid = 0; streamid < rt->nb_rtsp_streams; streamid++) {
yading@11:         if (!strcmp(rt->rtsp_streams[streamid]->control_url,
yading@11:                     controlurl))
yading@11:             break;
yading@11:     }
yading@11:     if (streamid == rt->nb_rtsp_streams) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unable to find requested track\n");
yading@11:         return AVERROR_STREAM_NOT_FOUND;
yading@11:     }
yading@11:     rtsp_st   = rt->rtsp_streams[streamid];
yading@11:     localport = rt->rtp_port_min;
yading@11: 
yading@11:     if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
yading@11:         rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
yading@11:         if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
yading@11:             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
yading@11:             return ret;
yading@11:         }
yading@11:         rtsp_st->interleaved_min = request.transports[0].interleaved_min;
yading@11:         rtsp_st->interleaved_max = request.transports[0].interleaved_max;
yading@11:         snprintf(responseheaders, sizeof(responseheaders), "Transport: "
yading@11:                  "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d"
yading@11:                  "\r\n", request.transports[0].interleaved_min,
yading@11:                  request.transports[0].interleaved_max);
yading@11:     } else {
yading@11:         do {
yading@11:             ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
yading@11:             av_dlog(s, "Opening: %s", url);
yading@11:             ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
yading@11:                              &s->interrupt_callback, NULL);
yading@11:             if (ret)
yading@11:                 localport += 2;
yading@11:         } while (ret || localport > rt->rtp_port_max);
yading@11:         if (localport > rt->rtp_port_max) {
yading@11:             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
yading@11:             return ret;
yading@11:         }
yading@11: 
yading@11:         av_dlog(s, "Listening on: %d",
yading@11:                 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
yading@11:         if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
yading@11:             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
yading@11:             return ret;
yading@11:         }
yading@11: 
yading@11:         localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
yading@11:         snprintf(responseheaders, sizeof(responseheaders), "Transport: "
yading@11:                  "RTP/AVP/UDP;unicast;mode=receive;source=%s;"
yading@11:                  "client_port=%d-%d;server_port=%d-%d\r\n",
yading@11:                  host, request.transports[0].client_port_min,
yading@11:                  request.transports[0].client_port_max, localport,
yading@11:                  localport + 1);
yading@11:     }
yading@11: 
yading@11:     /* Establish sessionid if not previously set */
yading@11:     /* Put this in a function? */
yading@11:     /* RFC 2326: session id must be at least 8 digits */
yading@11:     while (strlen(rt->session_id) < 8)
yading@11:         av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
yading@11: 
yading@11:     av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
yading@11:                 rt->session_id);
yading@11:     /* Send Reply */
yading@11:     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
yading@11: 
yading@11:     rt->state = RTSP_STATE_PAUSED;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rtsp_read_record(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt             = s->priv_data;
yading@11:     RTSPMessageHeader request = { 0 };
yading@11:     int ret                   = 0;
yading@11:     char responseheaders[1024];
yading@11: 
yading@11:     ret = rtsp_read_request(s, &request, "RECORD");
yading@11:     if (ret)
yading@11:         return ret;
yading@11:     ret = check_sessionid(s, &request);
yading@11:     if (ret)
yading@11:         return ret;
yading@11:     rt->seq++;
yading@11:     snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
yading@11:              rt->session_id);
yading@11:     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
yading@11: 
yading@11:     rt->state = RTSP_STATE_STREAMING;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static inline int parse_command_line(AVFormatContext *s, const char *line,
yading@11:                                      int linelen, char *uri, int urisize,
yading@11:                                      char *method, int methodsize,
yading@11:                                      enum RTSPMethod *methodcode)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     const char *linept, *searchlinept;
yading@11:     linept = strchr(line, ' ');
yading@11:     if (linept - line > methodsize - 1) {
yading@11:         av_log(s, AV_LOG_ERROR, "Method string too long\n");
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     memcpy(method, line, linept - line);
yading@11:     method[linept - line] = '\0';
yading@11:     linept++;
yading@11:     if (!strcmp(method, "ANNOUNCE"))
yading@11:         *methodcode = ANNOUNCE;
yading@11:     else if (!strcmp(method, "OPTIONS"))
yading@11:         *methodcode = OPTIONS;
yading@11:     else if (!strcmp(method, "RECORD"))
yading@11:         *methodcode = RECORD;
yading@11:     else if (!strcmp(method, "SETUP"))
yading@11:         *methodcode = SETUP;
yading@11:     else if (!strcmp(method, "PAUSE"))
yading@11:         *methodcode = PAUSE;
yading@11:     else if (!strcmp(method, "TEARDOWN"))
yading@11:         *methodcode = TEARDOWN;
yading@11:     else
yading@11:         *methodcode = UNKNOWN;
yading@11:     /* Check method with the state  */
yading@11:     if (rt->state == RTSP_STATE_IDLE) {
yading@11:         if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
yading@11:             av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
yading@11:                    line);
yading@11:             return AVERROR_PROTOCOL_NOT_FOUND;
yading@11:         }
yading@11:     } else if (rt->state == RTSP_STATE_PAUSED) {
yading@11:         if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
yading@11:             && (*methodcode != SETUP)) {
yading@11:             av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
yading@11:                    line);
yading@11:             return AVERROR_PROTOCOL_NOT_FOUND;
yading@11:         }
yading@11:     } else if (rt->state == RTSP_STATE_STREAMING) {
yading@11:         if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
yading@11:             && (*methodcode != TEARDOWN)) {
yading@11:             av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
yading@11:                    " %s\n", line);
yading@11:             return AVERROR_PROTOCOL_NOT_FOUND;
yading@11:         }
yading@11:     } else {
yading@11:         av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
yading@11:         return AVERROR_BUG;
yading@11:     }
yading@11: 
yading@11:     searchlinept = strchr(linept, ' ');
yading@11:     if (searchlinept == NULL) {
yading@11:         av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     if (searchlinept - linept > urisize - 1) {
yading@11:         av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     memcpy(uri, linept, searchlinept - linept);
yading@11:     uri[searchlinept - linept] = '\0';
yading@11:     if (strcmp(rt->control_uri, uri)) {
yading@11:         char host[128], path[512], auth[128];
yading@11:         int port;
yading@11:         char ctl_host[128], ctl_path[512], ctl_auth[128];
yading@11:         int ctl_port;
yading@11:         av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
yading@11:                      path, sizeof(path), uri);
yading@11:         av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
yading@11:                      sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
yading@11:                      rt->control_uri);
yading@11:         if (strcmp(host, ctl_host))
yading@11:             av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
yading@11:                    host, ctl_host);
yading@11:         if (strcmp(path, ctl_path) && *methodcode != SETUP)
yading@11:             av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
yading@11:                    " %s\n", path, ctl_path);
yading@11:         if (*methodcode == ANNOUNCE) {
yading@11:             av_log(s, AV_LOG_INFO,
yading@11:                    "Updating control URI to %s\n", uri);
yading@11:             av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     linept = searchlinept + 1;
yading@11:     if (!av_strstart(linept, "RTSP/1.0", NULL)) {
yading@11:         av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
yading@11:         return AVERROR_PROTOCOL_NOT_FOUND;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     unsigned char rbuf[4096];
yading@11:     unsigned char method[10];
yading@11:     char uri[500];
yading@11:     int ret;
yading@11:     int rbuflen               = 0;
yading@11:     RTSPMessageHeader request = { 0 };
yading@11:     enum RTSPMethod methodcode;
yading@11: 
yading@11:     ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11:     ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
yading@11:                              sizeof(method), &methodcode);
yading@11:     if (ret) {
yading@11:         av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
yading@11:         return ret;
yading@11:     }
yading@11: 
yading@11:     ret = rtsp_read_request(s, &request, method);
yading@11:     if (ret)
yading@11:         return ret;
yading@11:     rt->seq++;
yading@11:     if (methodcode == PAUSE) {
yading@11:         rt->state = RTSP_STATE_PAUSED;
yading@11:         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
yading@11:         // TODO: Missing date header in response
yading@11:     } else if (methodcode == OPTIONS) {
yading@11:         ret = rtsp_send_reply(s, RTSP_STATUS_OK,
yading@11:                               "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
yading@11:                               "RECORD\r\n", request.seq);
yading@11:     } else if (methodcode == TEARDOWN) {
yading@11:         rt->state = RTSP_STATE_IDLE;
yading@11:         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
yading@11:         return 0;
yading@11:     }
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int rtsp_read_play(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     RTSPMessageHeader reply1, *reply = &reply1;
yading@11:     int i;
yading@11:     char cmd[1024];
yading@11: 
yading@11:     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
yading@11:     rt->nb_byes = 0;
yading@11: 
yading@11:     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
yading@11:         if (rt->transport == RTSP_TRANSPORT_RTP) {
yading@11:             for (i = 0; i < rt->nb_rtsp_streams; i++) {
yading@11:                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
yading@11:                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
yading@11:                 if (!rtpctx)
yading@11:                     continue;
yading@11:                 ff_rtp_reset_packet_queue(rtpctx);
yading@11:                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
yading@11:                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
yading@11:                 rtpctx->base_timestamp      = 0;
yading@11:                 rtpctx->timestamp           = 0;
yading@11:                 rtpctx->unwrapped_timestamp = 0;
yading@11:                 rtpctx->rtcp_ts_offset      = 0;
yading@11:             }
yading@11:         }
yading@11:         if (rt->state == RTSP_STATE_PAUSED) {
yading@11:             cmd[0] = 0;
yading@11:         } else {
yading@11:             snprintf(cmd, sizeof(cmd),
yading@11:                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
yading@11:                      rt->seek_timestamp / AV_TIME_BASE,
yading@11:                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
yading@11:         }
yading@11:         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
yading@11:         if (reply->status_code != RTSP_STATUS_OK) {
yading@11:             return -1;
yading@11:         }
yading@11:         if (rt->transport == RTSP_TRANSPORT_RTP &&
yading@11:             reply->range_start != AV_NOPTS_VALUE) {
yading@11:             for (i = 0; i < rt->nb_rtsp_streams; i++) {
yading@11:                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
yading@11:                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
yading@11:                 AVStream *st = NULL;
yading@11:                 if (!rtpctx || rtsp_st->stream_index < 0)
yading@11:                     continue;
yading@11:                 st = s->streams[rtsp_st->stream_index];
yading@11:                 rtpctx->range_start_offset =
yading@11:                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
yading@11:                                  st->time_base);
yading@11:             }
yading@11:         }
yading@11:     }
yading@11:     rt->state = RTSP_STATE_STREAMING;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: /* pause the stream */
yading@11: static int rtsp_read_pause(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     RTSPMessageHeader reply1, *reply = &reply1;
yading@11: 
yading@11:     if (rt->state != RTSP_STATE_STREAMING)
yading@11:         return 0;
yading@11:     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
yading@11:         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
yading@11:         if (reply->status_code != RTSP_STATUS_OK) {
yading@11:             return -1;
yading@11:         }
yading@11:     }
yading@11:     rt->state = RTSP_STATE_PAUSED;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     char cmd[1024];
yading@11:     unsigned char *content = NULL;
yading@11:     int ret;
yading@11: 
yading@11:     /* describe the stream */
yading@11:     snprintf(cmd, sizeof(cmd),
yading@11:              "Accept: application/sdp\r\n");
yading@11:     if (rt->server_type == RTSP_SERVER_REAL) {
yading@11:         /**
yading@11:          * The Require: attribute is needed for proper streaming from
yading@11:          * Realmedia servers.
yading@11:          */
yading@11:         av_strlcat(cmd,
yading@11:                    "Require: com.real.retain-entity-for-setup\r\n",
yading@11:                    sizeof(cmd));
yading@11:     }
yading@11:     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
yading@11:     if (!content)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     if (reply->status_code != RTSP_STATUS_OK) {
yading@11:         av_freep(&content);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
yading@11:     /* now we got the SDP description, we parse it */
yading@11:     ret = ff_sdp_parse(s, (const char *)content);
yading@11:     av_freep(&content);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rtsp_listen(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     char host[128], path[512], auth[128];
yading@11:     char uri[500];
yading@11:     int port;
yading@11:     char tcpname[500];
yading@11:     unsigned char rbuf[4096];
yading@11:     unsigned char method[10];
yading@11:     int rbuflen = 0;
yading@11:     int ret;
yading@11:     enum RTSPMethod methodcode;
yading@11: 
yading@11:     /* extract hostname and port */
yading@11:     av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
yading@11:                  path, sizeof(path), s->filename);
yading@11: 
yading@11:     /* ff_url_join. No authorization by now (NULL) */
yading@11:     ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL, host,
yading@11:                 port, "%s", path);
yading@11: 
yading@11:     if (port < 0)
yading@11:         port = RTSP_DEFAULT_PORT;
yading@11: 
yading@11:     /* Create TCP connection */
yading@11:     ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port,
yading@11:                 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
yading@11: 
yading@11:     if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
yading@11:                          &s->interrupt_callback, NULL)) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
yading@11:         return ret;
yading@11:     }
yading@11:     rt->state       = RTSP_STATE_IDLE;
yading@11:     rt->rtsp_hd_out = rt->rtsp_hd;
yading@11:     for (;;) { /* Wait for incoming RTSP messages */
yading@11:         ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
yading@11:         if (ret < 0)
yading@11:             return ret;
yading@11:         ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
yading@11:                                  sizeof(method), &methodcode);
yading@11:         if (ret) {
yading@11:             av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
yading@11:             return ret;
yading@11:         }
yading@11: 
yading@11:         if (methodcode == ANNOUNCE) {
yading@11:             ret       = rtsp_read_announce(s);
yading@11:             rt->state = RTSP_STATE_PAUSED;
yading@11:         } else if (methodcode == OPTIONS) {
yading@11:             ret = rtsp_read_options(s);
yading@11:         } else if (methodcode == RECORD) {
yading@11:             ret = rtsp_read_record(s);
yading@11:             if (!ret)
yading@11:                 return 0; // We are ready for streaming
yading@11:         } else if (methodcode == SETUP)
yading@11:             ret = rtsp_read_setup(s, host, uri);
yading@11:         if (ret) {
yading@11:             ffurl_close(rt->rtsp_hd);
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rtsp_probe(AVProbeData *p)
yading@11: {
yading@11:     if (av_strstart(p->filename, "rtsp:", NULL))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rtsp_read_header(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     int ret;
yading@11: 
yading@11:     if (rt->initial_timeout > 0)
yading@11:         rt->rtsp_flags |= RTSP_FLAG_LISTEN;
yading@11: 
yading@11:     if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
yading@11:         ret = rtsp_listen(s);
yading@11:         if (ret)
yading@11:             return ret;
yading@11:     } else {
yading@11:         ret = ff_rtsp_connect(s);
yading@11:         if (ret)
yading@11:             return ret;
yading@11: 
yading@11:         rt->real_setup_cache = !s->nb_streams ? NULL :
yading@11:             av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
yading@11:         if (!rt->real_setup_cache && s->nb_streams)
yading@11:             return AVERROR(ENOMEM);
yading@11:         rt->real_setup = rt->real_setup_cache + s->nb_streams;
yading@11: 
yading@11:         if (rt->initial_pause) {
yading@11:             /* do not start immediately */
yading@11:         } else {
yading@11:             if (rtsp_read_play(s) < 0) {
yading@11:                 ff_rtsp_close_streams(s);
yading@11:                 ff_rtsp_close_connections(s);
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
yading@11:                             uint8_t *buf, int buf_size)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     int id, len, i, ret;
yading@11:     RTSPStream *rtsp_st;
yading@11: 
yading@11:     av_dlog(s, "tcp_read_packet:\n");
yading@11: redo:
yading@11:     for (;;) {
yading@11:         RTSPMessageHeader reply;
yading@11: 
yading@11:         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
yading@11:         if (ret < 0)
yading@11:             return ret;
yading@11:         if (ret == 1) /* received '$' */
yading@11:             break;
yading@11:         /* XXX: parse message */
yading@11:         if (rt->state != RTSP_STATE_STREAMING)
yading@11:             return 0;
yading@11:     }
yading@11:     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
yading@11:     if (ret != 3)
yading@11:         return -1;
yading@11:     id  = buf[0];
yading@11:     len = AV_RB16(buf + 1);
yading@11:     av_dlog(s, "id=%d len=%d\n", id, len);
yading@11:     if (len > buf_size || len < 8)
yading@11:         goto redo;
yading@11:     /* get the data */
yading@11:     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
yading@11:     if (ret != len)
yading@11:         return -1;
yading@11:     if (rt->transport == RTSP_TRANSPORT_RDT &&
yading@11:         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
yading@11:         return -1;
yading@11: 
yading@11:     /* find the matching stream */
yading@11:     for (i = 0; i < rt->nb_rtsp_streams; i++) {
yading@11:         rtsp_st = rt->rtsp_streams[i];
yading@11:         if (id >= rtsp_st->interleaved_min &&
yading@11:             id <= rtsp_st->interleaved_max)
yading@11:             goto found;
yading@11:     }
yading@11:     goto redo;
yading@11: found:
yading@11:     *prtsp_st = rtsp_st;
yading@11:     return len;
yading@11: }
yading@11: 
yading@11: static int resetup_tcp(AVFormatContext *s)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     char host[1024];
yading@11:     int port;
yading@11: 
yading@11:     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
yading@11:                  s->filename);
yading@11:     ff_rtsp_undo_setup(s);
yading@11:     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
yading@11:                                       rt->real_challenge);
yading@11: }
yading@11: 
yading@11: static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11:     int ret;
yading@11:     RTSPMessageHeader reply1, *reply = &reply1;
yading@11:     char cmd[1024];
yading@11: 
yading@11: retry:
yading@11:     if (rt->server_type == RTSP_SERVER_REAL) {
yading@11:         int i;
yading@11: 
yading@11:         for (i = 0; i < s->nb_streams; i++)
yading@11:             rt->real_setup[i] = s->streams[i]->discard;
yading@11: 
yading@11:         if (!rt->need_subscription) {
yading@11:             if (memcmp (rt->real_setup, rt->real_setup_cache,
yading@11:                         sizeof(enum AVDiscard) * s->nb_streams)) {
yading@11:                 snprintf(cmd, sizeof(cmd),
yading@11:                          "Unsubscribe: %s\r\n",
yading@11:                          rt->last_subscription);
yading@11:                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
yading@11:                                  cmd, reply, NULL);
yading@11:                 if (reply->status_code != RTSP_STATUS_OK)
yading@11:                     return AVERROR_INVALIDDATA;
yading@11:                 rt->need_subscription = 1;
yading@11:             }
yading@11:         }
yading@11: 
yading@11:         if (rt->need_subscription) {
yading@11:             int r, rule_nr, first = 1;
yading@11: 
yading@11:             memcpy(rt->real_setup_cache, rt->real_setup,
yading@11:                    sizeof(enum AVDiscard) * s->nb_streams);
yading@11:             rt->last_subscription[0] = 0;
yading@11: 
yading@11:             snprintf(cmd, sizeof(cmd),
yading@11:                      "Subscribe: ");
yading@11:             for (i = 0; i < rt->nb_rtsp_streams; i++) {
yading@11:                 rule_nr = 0;
yading@11:                 for (r = 0; r < s->nb_streams; r++) {
yading@11:                     if (s->streams[r]->id == i) {
yading@11:                         if (s->streams[r]->discard != AVDISCARD_ALL) {
yading@11:                             if (!first)
yading@11:                                 av_strlcat(rt->last_subscription, ",",
yading@11:                                            sizeof(rt->last_subscription));
yading@11:                             ff_rdt_subscribe_rule(
yading@11:                                 rt->last_subscription,
yading@11:                                 sizeof(rt->last_subscription), i, rule_nr);
yading@11:                             first = 0;
yading@11:                         }
yading@11:                         rule_nr++;
yading@11:                     }
yading@11:                 }
yading@11:             }
yading@11:             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
yading@11:             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
yading@11:                              cmd, reply, NULL);
yading@11:             if (reply->status_code != RTSP_STATUS_OK)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             rt->need_subscription = 0;
yading@11: 
yading@11:             if (rt->state == RTSP_STATE_STREAMING)
yading@11:                 rtsp_read_play (s);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     ret = ff_rtsp_fetch_packet(s, pkt);
yading@11:     if (ret < 0) {
yading@11:         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
yading@11:             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
yading@11:                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
yading@11:                 RTSPMessageHeader reply1, *reply = &reply1;
yading@11:                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
yading@11:                 if (rtsp_read_pause(s) != 0)
yading@11:                     return -1;
yading@11:                 // TEARDOWN is required on Real-RTSP, but might make
yading@11:                 // other servers close the connection.
yading@11:                 if (rt->server_type == RTSP_SERVER_REAL)
yading@11:                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
yading@11:                                      reply, NULL);
yading@11:                 rt->session_id[0] = '\0';
yading@11:                 if (resetup_tcp(s) == 0) {
yading@11:                     rt->state = RTSP_STATE_IDLE;
yading@11:                     rt->need_subscription = 1;
yading@11:                     if (rtsp_read_play(s) != 0)
yading@11:                         return -1;
yading@11:                     goto retry;
yading@11:                 }
yading@11:             }
yading@11:         }
yading@11:         return ret;
yading@11:     }
yading@11:     rt->packets++;
yading@11: 
yading@11:     if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
yading@11:         /* send dummy request to keep TCP connection alive */
yading@11:         if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
yading@11:             rt->auth_state.stale) {
yading@11:             if (rt->server_type == RTSP_SERVER_WMS ||
yading@11:                 (rt->server_type != RTSP_SERVER_REAL &&
yading@11:                  rt->get_parameter_supported)) {
yading@11:                 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
yading@11:             } else {
yading@11:                 ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
yading@11:             }
yading@11:             /* The stale flag should be reset when creating the auth response in
yading@11:              * ff_rtsp_send_cmd_async, but reset it here just in case we never
yading@11:              * called the auth code (if we didn't have any credentials set). */
yading@11:             rt->auth_state.stale = 0;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rtsp_read_seek(AVFormatContext *s, int stream_index,
yading@11:                           int64_t timestamp, int flags)
yading@11: {
yading@11:     RTSPState *rt = s->priv_data;
yading@11: 
yading@11:     rt->seek_timestamp = av_rescale_q(timestamp,
yading@11:                                       s->streams[stream_index]->time_base,
yading@11:                                       AV_TIME_BASE_Q);
yading@11:     switch(rt->state) {
yading@11:     default:
yading@11:     case RTSP_STATE_IDLE:
yading@11:         break;
yading@11:     case RTSP_STATE_STREAMING:
yading@11:         if (rtsp_read_pause(s) != 0)
yading@11:             return -1;
yading@11:         rt->state = RTSP_STATE_SEEKING;
yading@11:         if (rtsp_read_play(s) != 0)
yading@11:             return -1;
yading@11:         break;
yading@11:     case RTSP_STATE_PAUSED:
yading@11:         rt->state = RTSP_STATE_IDLE;
yading@11:         break;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static const AVClass rtsp_demuxer_class = {
yading@11:     .class_name     = "RTSP demuxer",
yading@11:     .item_name      = av_default_item_name,
yading@11:     .option         = ff_rtsp_options,
yading@11:     .version        = LIBAVUTIL_VERSION_INT,
yading@11: };
yading@11: 
yading@11: AVInputFormat ff_rtsp_demuxer = {
yading@11:     .name           = "rtsp",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("RTSP input"),
yading@11:     .priv_data_size = sizeof(RTSPState),
yading@11:     .read_probe     = rtsp_probe,
yading@11:     .read_header    = rtsp_read_header,
yading@11:     .read_packet    = rtsp_read_packet,
yading@11:     .read_close     = rtsp_read_close,
yading@11:     .read_seek      = rtsp_read_seek,
yading@11:     .flags          = AVFMT_NOFILE,
yading@11:     .read_play      = rtsp_read_play,
yading@11:     .read_pause     = rtsp_read_pause,
yading@11:     .priv_class     = &rtsp_demuxer_class,
yading@11: };