for #133, finish rtsp sdp, start rtp.

@@ -68,7 +68,7 @@ SrsRtspConn::SrsRtspConn(SrsRtspCaster* c, st_netfd_t fd, std::string o)
 {
     output = o;
 
-    session = "O9EaZ4bf"; // TODO: FIXME: generate session id.
+    session = "";
     video_rtp = NULL;
     audio_rtp = NULL;
 
@@ -118,7 +118,9 @@ int SrsRtspConn::do_cycle()
         srs_info("rtsp: got rtsp request");
 
         if (req->is_options()) {
-            if ((ret = rtsp->send_message(new SrsRtspOptionsResponse(req->seq))) != ERROR_SUCCESS) {
+            SrsRtspOptionsResponse* res = new SrsRtspOptionsResponse(req->seq);
+            res->session = session;
+            if ((ret = rtsp->send_message(res)) != ERROR_SUCCESS) {
                 if (!srs_is_client_gracefully_close(ret)) {
                     srs_error("rtsp: send OPTIONS response failed. ret=%d", ret);
                 }
@@ -136,7 +138,10 @@ int SrsRtspConn::do_cycle()
                 req->sdp->audio_stream_id.c_str(), req->sdp->audio_codec.c_str(), 
                 req->sdp->audio_sample_rate.c_str(), req->sdp->audio_channel.c_str()
             );
-            if ((ret = rtsp->send_message(new SrsRtspResponse(req->seq))) != ERROR_SUCCESS) {
+
+            SrsRtspResponse* res = new SrsRtspResponse(req->seq);
+            res->session = session;
+            if ((ret = rtsp->send_message(res)) != ERROR_SUCCESS) {
                 if (!srs_is_client_gracefully_close(ret)) {
                     srs_error("rtsp: send ANNOUNCE response failed. ret=%d", ret);
                 }
@@ -164,6 +169,11 @@ int SrsRtspConn::do_cycle()
             }
             srs_trace("rtsp: rtp listen at port=%d ok.", lpm);
 
+            // create session.
+            if (session.empty()) {
+                session = "O9EaZ4bf"; // TODO: FIXME: generate session id.
+            }
+
             SrsRtspSetupResponse* res = new SrsRtspSetupResponse(req->seq);
             res->client_port_min = req->transport->client_port_min;
             res->client_port_max = req->transport->client_port_max;
@@ -176,6 +186,15 @@ int SrsRtspConn::do_cycle()
                 }
                 return ret;
             }
+        } else if (req->is_record()) {
+            SrsRtspResponse* res = new SrsRtspResponse(req->seq);
+            res->session = session;
+            if ((ret = rtsp->send_message(res)) != ERROR_SUCCESS) {
+                if (!srs_is_client_gracefully_close(ret)) {
+                    srs_error("rtsp: send SETUP response failed. ret=%d", ret);
+                }
+                return ret;
+            }
         }
     }
 

@@ -486,6 +486,11 @@ bool SrsRtspRequest::is_setup()
     return method == __SRS_METHOD_SETUP;
 }
 
+bool SrsRtspRequest::is_record()
+{
+    return method == __SRS_METHOD_RECORD;
+}
+
 SrsRtspResponse::SrsRtspResponse(int cseq)
 {
     seq = cseq;
@@ -513,6 +518,11 @@ int SrsRtspResponse::encode(stringstream& ss)
         << "Pragma: no-cache" << __SRS_RTSP_CRLF
         << "Server: " << RTMP_SIG_SRS_SERVER << __SRS_RTSP_CRLF;
 
+    // session if specified.
+    if (!session.empty()) {
+        ss << __SRS_TOKEN_SESSION << ":" << session << __SRS_RTSP_CRLF;
+    }
+
     if ((ret = encode_header(ss)) != ERROR_SUCCESS) {
         srs_error("rtsp: encode header failed. ret=%d", ret);
         return ret;
@@ -730,6 +740,13 @@ int SrsRtspStack::do_recv_message(SrsRtspRequest* req)
                 srs_error("rtsp: parse transport failed, transport=%s. ret=%d", transport.c_str(), ret);
                 return ret;
             }
+        } else if (token == __SRS_TOKEN_SESSION) {
+            if ((ret = recv_token_eof(req->session)) != ERROR_SUCCESS) {
+                if (!srs_is_client_gracefully_close(ret)) {
+                    srs_error("rtsp: parse %s failed. ret=%d", __SRS_TOKEN_SESSION, ret);
+                }
+                return ret;
+            }
         } else {
             // unknown header name, parse util EOF.
             SrsRtspTokenState state = SrsRtspTokenStateNormal;

@@ -337,6 +337,10 @@ public:
     * assumed. It is interpreted according to [H14.14].
     */
     long content_length;
+    /**
+    * the session id.
+    */
+    std::string session;
 
     /**
     * the sdp in announce, NULL for no sdp.
@@ -357,6 +361,7 @@ public:
     virtual bool is_options();
     virtual bool is_announce();
     virtual bool is_setup();
+    virtual bool is_record();
 };
 
 /**
@@ -401,6 +406,10 @@ public:
     * for retransmissions of the same request).
     */
     long seq;
+    /**
+    * the session id.
+    */
+    std::string session;
 public:
     SrsRtspResponse(int cseq);
     virtual ~SrsRtspResponse();