GF_EXPORT
GF_Err gf_rtsp_get_command(GF_RTSPSession *sess, GF_RTSPCommand *com)
{
GF_Err e;
u32 BodyStart, size;
if (!sess || !com) return GF_BAD_PARAM;
//reset the command
gf_rtsp_command_reset(com);
//if no connection, we have sent a "Connection: Close"
if (!sess->connection) return GF_IP_CONNECTION_CLOSED;
//lock
gf_mx_p(sess->mx);
//fill TCP buffer
e = gf_rtsp_fill_buffer(sess);
if (e) goto exit;
//this is upcoming, interleaved data
if (strncmp(sess->TCPBuffer+sess->CurrentPos, "RTSP", 4)) {
e = GF_IP_NETWORK_EMPTY;
goto exit;
}
e = gf_rtsp_read_reply(sess);
if (e) goto exit;
gf_rtsp_get_body_info(sess, &BodyStart, &size);
e = RTSP_ParseCommandHeader(sess, com, BodyStart);
//before returning an error we MUST reset the TCP buffer
//copy the body if any
if (!e && com->Content_Length) {
com->body = (char *) gf_malloc(sizeof(char) * (com->Content_Length));
memcpy(com->body, sess->TCPBuffer+sess->CurrentPos + BodyStart, com->Content_Length);
}
//reset TCP buffer
sess->CurrentPos += BodyStart + com->Content_Length;
if (!com->CSeq) com->StatusCode = NC_RTSP_Bad_Request;
if (e || (com->StatusCode != NC_RTSP_OK)) goto exit;
//NB: there is no "session state" in our lib when acting at the server side, as it depends
//on the server implementation. We cannot block responses / announcement to be sent
//dynamically, nor reset the session ourselves as we don't know the details of the session
//(eg TEARDOWN may keep resources up or not, ...)
//we also have the same pb for CSeq, as nothing forbids a server to buffer commands (and it
//happens during aggregation of PLAY/PAUSE with overlapping ranges)
//however store the last CSeq in case for client checking
if (!sess->CSeq) {
sess->CSeq = com->CSeq;
}
//check we're in the right range
else {
if (sess->CSeq >= com->CSeq)
com->StatusCode = NC_RTSP_Header_Field_Not_Valid;
else
sess->CSeq = com->CSeq;
}
//
//if a connection closed is signal, check this is the good session
// and reset it (the client is no longer connected)
if (sess->last_session_id && com->Session && !strcmp(com->Session, sess->last_session_id)
&& com->Connection && !stricmp(com->Connection, "Close")) {
gf_rtsp_session_reset(sess, 0);
//destroy the socket
if (sess->connection) gf_sk_del(sess->connection);
sess->connection = NULL;
//destroy the http tunnel if any
if (sess->HasTunnel && sess->http) {
gf_sk_del(sess->http);
sess->http = NULL;
}
}
exit:
gf_mx_v(sess->mx);
return e;
}
M4Err RTSP_GetRequest(RTSPSession *sess, RTSPCommand *com)
{
M4Err e;
u32 BodyStart, size;
if (!sess || !com) return M4BadParam;
//reset the command
RTSP_ResetCommand(com);
//if no connection, we have sent a "Connection: Close"
if (!sess->connection) return M4ConnectionClosed;
//lock
MX_P(sess->mx);
//fill TCP buffer
e = RTSP_FillTCPBuffer(sess);
if (e) goto exit;
//this is upcoming, interleaved data
if (strncmp(sess->TCPBuffer+sess->CurrentPos, "RTSP", 4)) {
e = M4NetworkEmpty;
goto exit;
}
e = RTSP_ReadReply(sess);
if (e) goto exit;
RTSP_GetBodyInfo(sess, &BodyStart, &size);
e = RTSP_ParseCommandHeader(sess, com, BodyStart);
//before returning an error we MUST reset the TCP buffer
//copy the body if any
if (!e && com->Content_Length) {
com->body = malloc(sizeof(char) * (com->Content_Length));
memcpy(com->body, sess->TCPBuffer+sess->CurrentPos + BodyStart, com->Content_Length);
}
//reset TCP buffer
sess->CurrentPos += BodyStart + com->Content_Length;
if (!com->CSeq) com->StatusCode = NC_RTSP_Bad_Request;
if (e || (com->StatusCode != NC_RTSP_OK)) goto exit;
//NB: there is no "session state" in our lib when acting at the server side, as it depends
//on the server implementation. We cannot block responses / announcement to be sent
//dynamically, nor reset the session ourselves as we don't know the details of the session
//(eg TEARDOWN may keep resources up or not, ...)
//we also have the same pb for CSeq, as nothing forbids a server to buffer commands (and it
//happens during aggregation of PLAY/PAUSE with overlapping ranges)
//however store the last CSeq in case for client checking
if (!sess->CSeq) {
sess->CSeq = com->CSeq;
}
//check we're in the right range
else {
if (sess->CSeq >= com->CSeq)
com->StatusCode = NC_RTSP_Header_Field_Not_Valid;
else
sess->CSeq = com->CSeq;
}
//
//if a connection closed is signal, check this is the good session
// and reset it (the client is no longer connected)
if (sess->SessionID && com->Session && !strcmp(com->Session, sess->SessionID)
&& com->Connection && !stricmp(com->Connection, "Close")) {
RTSP_ResetSession(sess, 0);
//destroy the socket
if (sess->connection) SK_Delete(sess->connection);
sess->connection = NULL;
//destroy the http tunnel if any
if (sess->HasTunnel && sess->http) {
SK_Delete(sess->http);
sess->http = NULL;
}
}
exit:
MX_V(sess->mx);
return e;
}
