[MPlayer-dev-eng] Some minor patches (for RTSP/RTP streaming)

[Ross Finlayson]

These patches do the following:
1/ Fix a bug that causes mplayer to crash if "-dumpstream" is used with a 
RTP stream.
2/ Tell the RTSP client code to use the string "mplayer" in RTSP 
"User-Agent:" fields.  NOTE: This requires an up-to-date version of the 
LIVE.COM Streaming Media libraries.
3/ Fix a bug that could cause mplayer to crash on exit if a "rtsp://" URL 
was bad.

	Ross.

--- mplayer.c.old       Thu Aug 29 03:10:19 2002
+++ mplayer.c   Thu Aug 29 03:10:50 2002
@@ -1032,7 +1032,7 @@
    }
  #endif

-if(stream_dump_type==5){
+if(stream_dump_type==5 && stream->fd >= 0){
    unsigned char buf[4096];
    int len;
    FILE *f;

--- demux_rtp.cpp.old   Thu Aug 29 02:16:51 2002
+++ demux_rtp.cpp       Thu Aug 29 02:17:32 2002
@@ -111,7 +111,7 @@
        char const* url = demuxer->stream->streaming_ctrl->url->url;

        extern int verbose;
-      rtspClient = RTSPClient::createNew(*env, verbose);
+      rtspClient = RTSPClient::createNew(*env, verbose, "mplayer");
        if (rtspClient == NULL) {
         fprintf(stderr, "Failed to create RTSP client: %s\n",
                 env->getResultMsg());
@@ -310,6 +310,8 @@

    // Get the RTP state that was stored in the demuxer's 'priv' field:
    RTPState* rtpState = (RTPState*)(demuxer->priv);
+  if (rtpState == NULL) return;
+
    UsageEnvironment* env = NULL;
    TaskScheduler* scheduler = NULL;
    if (rtpState->mediaSession != NULL) {