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Send dummy requests over the TCP connection (WMS wants GET_PARAMETER,
Real wants OPTIONS) while the connection is idle, otherwise it will be aborted after a short period (usually a minute). See the thread "[PATCH] rtsp.c: keep-alive" on the mailinglist. Originally committed as revision 18525 to svn://svn.ffmpeg.org/ffmpeg/trunk
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888505df22
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@ -682,7 +682,12 @@ void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
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/* NOTE: we do case independent match for broken servers */
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p = buf;
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if (av_stristart(p, "Session:", &p)) {
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int t;
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get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
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if (av_stristart(p, ";timeout=", &p) &&
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(t = strtol(p, NULL, 10)) > 0) {
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reply->timeout = t;
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}
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} else if (av_stristart(p, "Content-Length:", &p)) {
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reply->content_length = strtol(p, NULL, 10);
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} else if (av_stristart(p, "Transport:", &p)) {
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@ -837,7 +842,7 @@ rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
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return 0;
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}
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static void rtsp_send_cmd(AVFormatContext *s,
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static void rtsp_send_cmd_async (AVFormatContext *s,
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const char *cmd, RTSPMessageHeader *reply,
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unsigned char **content_ptr)
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{
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@ -857,6 +862,14 @@ static void rtsp_send_cmd(AVFormatContext *s,
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printf("Sending:\n%s--\n", buf);
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#endif
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url_write(rt->rtsp_hd, buf, strlen(buf));
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rt->last_cmd_time = av_gettime();
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}
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static void rtsp_send_cmd (AVFormatContext *s,
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const char *cmd, RTSPMessageHeader *reply,
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unsigned char **content_ptr)
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{
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rtsp_send_cmd_async(s, cmd, reply, content_ptr);
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rtsp_read_reply(s, reply, content_ptr, 0);
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}
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@ -943,6 +956,9 @@ make_setup_request (AVFormatContext *s, const char *host, int port,
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else
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trans_pref = "RTP/AVP";
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/* default timeout: 1 minute */
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rt->timeout = 60;
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/* for each stream, make the setup request */
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/* XXX: we assume the same server is used for the control of each
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RTSP stream */
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@ -1123,6 +1139,9 @@ make_setup_request (AVFormatContext *s, const char *host, int port,
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goto fail;
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}
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if (reply->timeout > 0)
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rt->timeout = reply->timeout;
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if (rt->server_type == RTSP_SERVER_REAL)
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rt->need_subscription = 1;
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@ -1403,12 +1422,12 @@ static int rtsp_read_packet(AVFormatContext *s,
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RTSPStream *rtsp_st;
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int ret, len;
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uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
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RTSPMessageHeader reply1, *reply = &reply1;
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char cmd[1024];
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if (rt->server_type == RTSP_SERVER_REAL) {
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int i;
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RTSPMessageHeader reply1, *reply = &reply1;
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enum AVDiscard cache[MAX_STREAMS];
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char cmd[1024];
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for (i = 0; i < s->nb_streams; i++)
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cache[i] = s->streams[i]->discard;
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@ -1508,6 +1527,22 @@ static int rtsp_read_packet(AVFormatContext *s,
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/* more packets may follow, so we save the RTP context */
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rt->cur_transport_priv = rtsp_st->transport_priv;
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}
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/* send dummy request to keep TCP connection alive */
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if ((rt->server_type == RTSP_SERVER_WMS ||
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rt->server_type == RTSP_SERVER_REAL) &&
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(av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
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if (rt->server_type == RTSP_SERVER_WMS) {
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snprintf(cmd, sizeof(cmd) - 1,
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"GET_PARAMETER %s RTSP/1.0\r\n",
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s->filename);
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rtsp_send_cmd_async(s, cmd, reply, NULL);
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} else {
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rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n",
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reply, NULL);
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}
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}
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return 0;
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}
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@ -132,6 +132,14 @@ typedef struct RTSPMessageHeader {
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* (RealServer compatible)" or "RealServer Version v.e.r.sion (platform)",
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* where platform is the output of $uname -msr | sed 's/ /-/g'. */
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char server[64];
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/** The "timeout" comes as part of the server response to the "SETUP"
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* command, in the "Session: <xyz>[;timeout=<value>]" line. It is the
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* time, in seconds, that the server will go without traffic over the
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* RTSP/TCP connection before it closes the connection. To prevent
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* this, sent dummy requests (e.g. OPTIONS) with intervals smaller
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* than this value. */
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int timeout;
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} RTSPMessageHeader;
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/**
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@ -192,6 +200,16 @@ typedef struct RTSPState {
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* identifier that the client should re-transmit in each RTSP command */
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char session_id[512];
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/** copy of RTSPMessageHeader->timeout, i.e. the time (in seconds) that
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* the server will go without traffic on the RTSP/TCP line before it
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* closes the connection. */
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int timeout;
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/** timestamp of the last RTSP command that we sent to the RTSP server.
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* This is used to calculate when to send dummy commands to keep the
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* connection alive, in conjunction with \p timeout. */
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int64_t last_cmd_time;
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/** the negotiated data/packet transport protocol; e.g. RTP or RDT */
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enum RTSPTransport transport;
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