X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Frtspdec.c;h=856be5678893e1f0eb670918ccddb8ec7692e59a;hb=bc426827492f6c741608af37e2eaab6c8072815d;hp=9c7df96a8fd9854100eda0d5b7e6f0a59d204596;hpb=b536e2facfa0872adeb6aaae4189f9b90d907e36;p=ffmpeg diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c index 9c7df96a8fd..856be567889 100644 --- a/libavformat/rtspdec.c +++ b/libavformat/rtspdec.c @@ -22,6 +22,8 @@ #include "libavutil/avstring.h" #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" +#include "libavutil/random_seed.h" +#include "libavutil/time.h" #include "avformat.h" #include "internal.h" @@ -31,6 +33,462 @@ #include "rdt.h" #include "url.h" +static const struct RTSPStatusMessage { + enum RTSPStatusCode code; + const char *message; +} status_messages[] = { + { RTSP_STATUS_OK, "OK" }, + { RTSP_STATUS_METHOD, "Method Not Allowed" }, + { RTSP_STATUS_BANDWIDTH, "Not Enough Bandwidth" }, + { RTSP_STATUS_SESSION, "Session Not Found" }, + { RTSP_STATUS_STATE, "Method Not Valid in This State" }, + { RTSP_STATUS_AGGREGATE, "Aggregate operation not allowed" }, + { RTSP_STATUS_ONLY_AGGREGATE, "Only aggregate operation allowed" }, + { RTSP_STATUS_TRANSPORT, "Unsupported transport" }, + { RTSP_STATUS_INTERNAL, "Internal Server Error" }, + { RTSP_STATUS_SERVICE, "Service Unavailable" }, + { RTSP_STATUS_VERSION, "RTSP Version not supported" }, + { 0, "NULL" } +}; + +static int rtsp_read_close(AVFormatContext *s) +{ + RTSPState *rt = s->priv_data; + + if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) + ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL); + + ff_rtsp_close_streams(s); + ff_rtsp_close_connections(s); + ff_network_close(); + rt->real_setup = NULL; + av_freep(&rt->real_setup_cache); + return 0; +} + +static inline int read_line(AVFormatContext *s, char *rbuf, const int rbufsize, + int *rbuflen) +{ + RTSPState *rt = s->priv_data; + int idx = 0; + int ret = 0; + *rbuflen = 0; + + do { + ret = ffurl_read_complete(rt->rtsp_hd, rbuf + idx, 1); + if (ret < 0) + return ret; + if (rbuf[idx] == '\r') { + /* Ignore */ + } else if (rbuf[idx] == '\n') { + rbuf[idx] = '\0'; + *rbuflen = idx; + return 0; + } else + idx++; + } while (idx < rbufsize); + av_log(s, AV_LOG_ERROR, "Message too long\n"); + return AVERROR(EIO); +} + +static int rtsp_send_reply(AVFormatContext *s, enum RTSPStatusCode code, + const char *extracontent, uint16_t seq) +{ + RTSPState *rt = s->priv_data; + char message[4096]; + int index = 0; + while (status_messages[index].code) { + if (status_messages[index].code == code) { + snprintf(message, sizeof(message), "RTSP/1.0 %d %s\r\n", + code, status_messages[index].message); + break; + } + index++; + } + if (!status_messages[index].code) + return AVERROR(EINVAL); + av_strlcatf(message, sizeof(message), "CSeq: %d\r\n", seq); + av_strlcatf(message, sizeof(message), "Server: %s\r\n", LIBAVFORMAT_IDENT); + if (extracontent) + av_strlcat(message, extracontent, sizeof(message)); + av_strlcat(message, "\r\n", sizeof(message)); + av_dlog(s, "Sending response:\n%s", message); + ffurl_write(rt->rtsp_hd, message, strlen(message)); + + return 0; +} + +static inline int check_sessionid(AVFormatContext *s, + RTSPMessageHeader *request) +{ + RTSPState *rt = s->priv_data; + unsigned char *session_id = rt->session_id; + if (!session_id[0]) { + av_log(s, AV_LOG_WARNING, "There is no session-id at the moment\n"); + return 0; + } + if (strcmp(session_id, request->session_id)) { + av_log(s, AV_LOG_ERROR, "Unexpected session-id %s\n", + request->session_id); + rtsp_send_reply(s, RTSP_STATUS_SESSION, NULL, request->seq); + return AVERROR_STREAM_NOT_FOUND; + } + return 0; +} + +static inline int rtsp_read_request(AVFormatContext *s, + RTSPMessageHeader *request, + const char *method) +{ + RTSPState *rt = s->priv_data; + char rbuf[1024]; + int rbuflen, ret; + do { + ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen); + if (ret) + return ret; + if (rbuflen > 1) { + av_dlog(s, "Parsing[%d]: %s\n", rbuflen, rbuf); + ff_rtsp_parse_line(request, rbuf, rt, method); + } + } while (rbuflen > 0); + if (request->seq != rt->seq + 1) { + av_log(s, AV_LOG_ERROR, "Unexpected Sequence number %d\n", + request->seq); + return AVERROR(EINVAL); + } + if (rt->session_id[0] && strcmp(method, "OPTIONS")) { + ret = check_sessionid(s, request); + if (ret) + return ret; + } + + return 0; +} + +static int rtsp_read_announce(AVFormatContext *s) +{ + RTSPState *rt = s->priv_data; + RTSPMessageHeader request = { 0 }; + char sdp[4096]; + int ret; + + ret = rtsp_read_request(s, &request, "ANNOUNCE"); + if (ret) + return ret; + rt->seq++; + if (strcmp(request.content_type, "application/sdp")) { + av_log(s, AV_LOG_ERROR, "Unexpected content type %s\n", + request.content_type); + rtsp_send_reply(s, RTSP_STATUS_SERVICE, NULL, request.seq); + return AVERROR_OPTION_NOT_FOUND; + } + if (request.content_length && request.content_length < sizeof(sdp) - 1) { + /* Read SDP */ + if (ffurl_read_complete(rt->rtsp_hd, sdp, request.content_length) + < request.content_length) { + av_log(s, AV_LOG_ERROR, + "Unable to get complete SDP Description in ANNOUNCE\n"); + rtsp_send_reply(s, RTSP_STATUS_INTERNAL, NULL, request.seq); + return AVERROR(EIO); + } + sdp[request.content_length] = '\0'; + av_log(s, AV_LOG_VERBOSE, "SDP: %s\n", sdp); + ret = ff_sdp_parse(s, sdp); + if (ret) + return ret; + rtsp_send_reply(s, RTSP_STATUS_OK, NULL, request.seq); + return 0; + } + av_log(s, AV_LOG_ERROR, + "Content-Length header value exceeds sdp allocated buffer (4KB)\n"); + rtsp_send_reply(s, RTSP_STATUS_INTERNAL, + "Content-Length exceeds buffer size", request.seq); + return AVERROR(EIO); +} + +static int rtsp_read_options(AVFormatContext *s) +{ + RTSPState *rt = s->priv_data; + RTSPMessageHeader request = { 0 }; + int ret = 0; + + /* Parsing headers */ + ret = rtsp_read_request(s, &request, "OPTIONS"); + if (ret) + return ret; + rt->seq++; + /* Send Reply */ + rtsp_send_reply(s, RTSP_STATUS_OK, + "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, RECORD\r\n", + request.seq); + return 0; +} + +static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl) +{ + RTSPState *rt = s->priv_data; + RTSPMessageHeader request = { 0 }; + int ret = 0; + char url[1024]; + RTSPStream *rtsp_st; + char responseheaders[1024]; + int localport = -1; + int transportidx = 0; + int streamid = 0; + + ret = rtsp_read_request(s, &request, "SETUP"); + if (ret) + return ret; + rt->seq++; + if (!request.nb_transports) { + av_log(s, AV_LOG_ERROR, "No transport defined in SETUP\n"); + return AVERROR_INVALIDDATA; + } + for (transportidx = 0; transportidx < request.nb_transports; + transportidx++) { + if (!request.transports[transportidx].mode_record || + (request.transports[transportidx].lower_transport != + RTSP_LOWER_TRANSPORT_UDP && + request.transports[transportidx].lower_transport != + RTSP_LOWER_TRANSPORT_TCP)) { + av_log(s, AV_LOG_ERROR, "mode=record/receive not set or transport" + " protocol not supported (yet)\n"); + return AVERROR_INVALIDDATA; + } + } + if (request.nb_transports > 1) + av_log(s, AV_LOG_WARNING, "More than one transport not supported, " + "using first of all\n"); + for (streamid = 0; streamid < rt->nb_rtsp_streams; streamid++) { + if (!strcmp(rt->rtsp_streams[streamid]->control_url, + controlurl)) + break; + } + if (streamid == rt->nb_rtsp_streams) { + av_log(s, AV_LOG_ERROR, "Unable to find requested track\n"); + return AVERROR_STREAM_NOT_FOUND; + } + rtsp_st = rt->rtsp_streams[streamid]; + localport = rt->rtp_port_min; + + if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) { + rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP; + if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) { + rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq); + return ret; + } + rtsp_st->interleaved_min = request.transports[0].interleaved_min; + rtsp_st->interleaved_max = request.transports[0].interleaved_max; + snprintf(responseheaders, sizeof(responseheaders), "Transport: " + "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d" + "\r\n", request.transports[0].interleaved_min, + request.transports[0].interleaved_max); + } else { + do { + ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL); + av_dlog(s, "Opening: %s", url); + ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE, + &s->interrupt_callback, NULL); + if (ret) + localport += 2; + } while (ret || localport > rt->rtp_port_max); + if (localport > rt->rtp_port_max) { + rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq); + return ret; + } + + av_dlog(s, "Listening on: %d", + ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle)); + if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) { + rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq); + return ret; + } + + localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle); + snprintf(responseheaders, sizeof(responseheaders), "Transport: " + "RTP/AVP/UDP;unicast;mode=receive;source=%s;" + "client_port=%d-%d;server_port=%d-%d\r\n", + host, request.transports[0].client_port_min, + request.transports[0].client_port_max, localport, + localport + 1); + } + + /* Establish sessionid if not previously set */ + /* Put this in a function? */ + /* RFC 2326: session id must be at least 8 digits */ + while (strlen(rt->session_id) < 8) + av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed()); + + av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n", + rt->session_id); + /* Send Reply */ + rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq); + + rt->state = RTSP_STATE_PAUSED; + return 0; +} + +static int rtsp_read_record(AVFormatContext *s) +{ + RTSPState *rt = s->priv_data; + RTSPMessageHeader request = { 0 }; + int ret = 0; + char responseheaders[1024]; + + ret = rtsp_read_request(s, &request, "RECORD"); + if (ret) + return ret; + ret = check_sessionid(s, &request); + if (ret) + return ret; + rt->seq++; + snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n", + rt->session_id); + rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq); + + rt->state = RTSP_STATE_STREAMING; + return 0; +} + +static inline int parse_command_line(AVFormatContext *s, const char *line, + int linelen, char *uri, int urisize, + char *method, int methodsize, + enum RTSPMethod *methodcode) +{ + RTSPState *rt = s->priv_data; + const char *linept, *searchlinept; + linept = strchr(line, ' '); + if (linept - line > methodsize - 1) { + av_log(s, AV_LOG_ERROR, "Method string too long\n"); + return AVERROR(EIO); + } + memcpy(method, line, linept - line); + method[linept - line] = '\0'; + linept++; + if (!strcmp(method, "ANNOUNCE")) + *methodcode = ANNOUNCE; + else if (!strcmp(method, "OPTIONS")) + *methodcode = OPTIONS; + else if (!strcmp(method, "RECORD")) + *methodcode = RECORD; + else if (!strcmp(method, "SETUP")) + *methodcode = SETUP; + else if (!strcmp(method, "PAUSE")) + *methodcode = PAUSE; + else if (!strcmp(method, "TEARDOWN")) + *methodcode = TEARDOWN; + else + *methodcode = UNKNOWN; + /* Check method with the state */ + if (rt->state == RTSP_STATE_IDLE) { + if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) { + av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n", + line); + return AVERROR_PROTOCOL_NOT_FOUND; + } + } else if (rt->state == RTSP_STATE_PAUSED) { + if ((*methodcode != OPTIONS) && (*methodcode != RECORD) + && (*methodcode != SETUP)) { + av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n", + line); + return AVERROR_PROTOCOL_NOT_FOUND; + } + } else if (rt->state == RTSP_STATE_STREAMING) { + if ((*methodcode != PAUSE) && (*methodcode != OPTIONS) + && (*methodcode != TEARDOWN)) { + av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State" + " %s\n", line); + return AVERROR_PROTOCOL_NOT_FOUND; + } + } else { + av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state); + return AVERROR_BUG; + } + + searchlinept = strchr(linept, ' '); + if (searchlinept == NULL) { + av_log(s, AV_LOG_ERROR, "Error parsing message URI\n"); + return AVERROR_INVALIDDATA; + } + if (searchlinept - linept > urisize - 1) { + av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n"); + return AVERROR(EIO); + } + memcpy(uri, linept, searchlinept - linept); + uri[searchlinept - linept] = '\0'; + if (strcmp(rt->control_uri, uri)) { + char host[128], path[512], auth[128]; + int port; + char ctl_host[128], ctl_path[512], ctl_auth[128]; + int ctl_port; + av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port, + path, sizeof(path), uri); + av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host, + sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path), + rt->control_uri); + if (strcmp(host, ctl_host)) + av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n", + host, ctl_host); + if (strcmp(path, ctl_path) && *methodcode != SETUP) + av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected" + " %s\n", path, ctl_path); + if (*methodcode == ANNOUNCE) { + av_log(s, AV_LOG_INFO, + "Updating control URI to %s\n", uri); + strcpy(rt->control_uri, uri); + } + } + + linept = searchlinept + 1; + if (!av_strstart(linept, "RTSP/1.0", NULL)) { + av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n"); + return AVERROR_PROTOCOL_NOT_FOUND; + } + return 0; +} + +int ff_rtsp_parse_streaming_commands(AVFormatContext *s) +{ + RTSPState *rt = s->priv_data; + unsigned char rbuf[4096]; + unsigned char method[10]; + char uri[500]; + int ret; + int rbuflen = 0; + RTSPMessageHeader request = { 0 }; + enum RTSPMethod methodcode; + + ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen); + if (ret < 0) + return ret; + ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method, + sizeof(method), &methodcode); + if (ret) { + av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n"); + return ret; + } + + ret = rtsp_read_request(s, &request, method); + if (ret) + return ret; + rt->seq++; + if (methodcode == PAUSE) { + rt->state = RTSP_STATE_PAUSED; + ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq); + // TODO: Missing date header in response + } else if (methodcode == OPTIONS) { + ret = rtsp_send_reply(s, RTSP_STATUS_OK, + "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, " + "RECORD\r\n", request.seq); + } else if (methodcode == TEARDOWN) { + rt->state = RTSP_STATE_IDLE; + ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq); + return 0; + } + return ret; +} + static int rtsp_read_play(AVFormatContext *s) { RTSPState *rt = s->priv_data; @@ -143,6 +601,67 @@ int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply) return 0; } +static int rtsp_listen(AVFormatContext *s) +{ + RTSPState *rt = s->priv_data; + char host[128], path[512], auth[128]; + char uri[500]; + int port; + char tcpname[500]; + unsigned char rbuf[4096]; + unsigned char method[10]; + int rbuflen = 0; + int ret; + enum RTSPMethod methodcode; + + /* extract hostname and port */ + av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port, + path, sizeof(path), s->filename); + + /* ff_url_join. No authorization by now (NULL) */ + ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL, host, + port, "%s", path); + /* Create TCP connection */ + ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, + "?listen&listen_timeout=%d", rt->initial_timeout * 1000); + + if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE, + &s->interrupt_callback, NULL)) { + av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n"); + return ret; + } + rt->state = RTSP_STATE_IDLE; + rt->rtsp_hd_out = rt->rtsp_hd; + for (;;) { /* Wait for incoming RTSP messages */ + ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen); + if (ret < 0) + return ret; + ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method, + sizeof(method), &methodcode); + if (ret) { + av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n"); + return ret; + } + + if (methodcode == ANNOUNCE) { + ret = rtsp_read_announce(s); + rt->state = RTSP_STATE_PAUSED; + } else if (methodcode == OPTIONS) { + ret = rtsp_read_options(s); + } else if (methodcode == RECORD) { + ret = rtsp_read_record(s); + if (!ret) + return 0; // We are ready for streaming + } else if (methodcode == SETUP) + ret = rtsp_read_setup(s, host, uri); + if (ret) { + ffurl_close(rt->rtsp_hd); + return AVERROR_INVALIDDATA; + } + } + return 0; +} + static int rtsp_probe(AVProbeData *p) { if (av_strstart(p->filename, "rtsp:", NULL)) @@ -155,23 +674,32 @@ static int rtsp_read_header(AVFormatContext *s) RTSPState *rt = s->priv_data; int ret; - ret = ff_rtsp_connect(s); - if (ret) - return ret; - - rt->real_setup_cache = !s->nb_streams ? NULL : - av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache)); - if (!rt->real_setup_cache && s->nb_streams) - return AVERROR(ENOMEM); - rt->real_setup = rt->real_setup_cache + s->nb_streams; + if (rt->initial_timeout > 0) + rt->rtsp_flags |= RTSP_FLAG_LISTEN; - if (rt->initial_pause) { - /* do not start immediately */ + if (rt->rtsp_flags & RTSP_FLAG_LISTEN) { + ret = rtsp_listen(s); + if (ret) + return ret; } else { - if (rtsp_read_play(s) < 0) { - ff_rtsp_close_streams(s); - ff_rtsp_close_connections(s); - return AVERROR_INVALIDDATA; + ret = ff_rtsp_connect(s); + if (ret) + return ret; + + rt->real_setup_cache = !s->nb_streams ? NULL : + av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache)); + if (!rt->real_setup_cache && s->nb_streams) + return AVERROR(ENOMEM); + rt->real_setup = rt->real_setup_cache + s->nb_streams; + + if (rt->initial_pause) { + /* do not start immediately */ + } else { + if (rtsp_read_play(s) < 0) { + ff_rtsp_close_streams(s); + ff_rtsp_close_connections(s); + return AVERROR_INVALIDDATA; + } } } @@ -335,20 +863,22 @@ retry: } rt->packets++; - /* send dummy request to keep TCP connection alive */ - if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 || - rt->auth_state.stale) { - if (rt->server_type == RTSP_SERVER_WMS || - (rt->server_type != RTSP_SERVER_REAL && - rt->get_parameter_supported)) { - ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL); - } else { - ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL); + if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) { + /* send dummy request to keep TCP connection alive */ + if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 || + rt->auth_state.stale) { + if (rt->server_type == RTSP_SERVER_WMS || + (rt->server_type != RTSP_SERVER_REAL && + rt->get_parameter_supported)) { + ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL); + } else { + ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL); + } + /* The stale flag should be reset when creating the auth response in + * ff_rtsp_send_cmd_async, but reset it here just in case we never + * called the auth code (if we didn't have any credentials set). */ + rt->auth_state.stale = 0; } - /* The stale flag should be reset when creating the auth response in - * ff_rtsp_send_cmd_async, but reset it here just in case we never - * called the auth code (if we didn't have any credentials set). */ - rt->auth_state.stale = 0; } return 0; @@ -380,20 +910,6 @@ static int rtsp_read_seek(AVFormatContext *s, int stream_index, return 0; } -static int rtsp_read_close(AVFormatContext *s) -{ - RTSPState *rt = s->priv_data; - - ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL); - - ff_rtsp_close_streams(s); - ff_rtsp_close_connections(s); - ff_network_close(); - rt->real_setup = NULL; - av_freep(&rt->real_setup_cache); - return 0; -} - static const AVClass rtsp_demuxer_class = { .class_name = "RTSP demuxer", .item_name = av_default_item_name, @@ -403,7 +919,7 @@ static const AVClass rtsp_demuxer_class = { AVInputFormat ff_rtsp_demuxer = { .name = "rtsp", - .long_name = NULL_IF_CONFIG_SMALL("RTSP input format"), + .long_name = NULL_IF_CONFIG_SMALL("RTSP input"), .priv_data_size = sizeof(RTSPState), .read_probe = rtsp_probe, .read_header = rtsp_read_header,