[Live-devel] IncreaseSendBufferTo / RTSP_PARAM_STRING_MAX / dynamic rtp payload types

[Rawling, Stuart]

I was investigating an issue where I was capturing an outgoing stream from
my RtspServer, and I noticed there were missing packets when I captured
using tcpdump.   I increased the send buffer size using
increaseSendBufferTo, and this helped the issue.

However, I was curious as to what is the difference between
increaseSendBufferTo and setSendBufferSize? (And the appropriate
ReceiveBuffer calls)
(setSendBufferTo does not seem to be called).

On a separate point. can we set the RTSP_PARAM_STRING_MAX to something
larger than 100?  I use 256, but  is there any reason it cannot be PATH_MAX
(which is OS indepenedent ­ tho I am not sure if this is defined on all
systems).  I use a larger size to allow more url parameters on the streams
on my server.

Another thing I have noticed is that there are certain non conforming
devices that can change their RTP payload midstream.  To handle this on my
client end I added the abilility to ignore the rtp payload type being
dynamic.  I did this by not checking the payload type if the expected type
was set to zero:
--- vendor/liveMedia/MultiFramedRTPSource.cpp
+++ custom/liveMedia/MultiFramedRTPSource.cpp
@@ -263,7 +263,10 @@
       bPacket->removePadding(numPaddingBytes);
     }
     // Check the Payload Type.
-    if ((unsigned char)((rtpHdr&0x007F0000)>>16)
+    //  Handle a payload type of 0
+    // Which means do not worry about the payload type
+    if (0 != source->rtpPayloadFormat() &&
+        (unsigned char)((rtpHdr&0x007F0000)>>16)
     != source->rtpPayloadFormat()) {
       break;
     }


Regards,
Stuart


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