[Live-devel] Retrieving stats for ProxyServerMediaSession

[Andy Hawkins]

Hi,

I can't pass a non-const pointer into getRTPSinkandRTCP as it will fail to compile:

error: no matching function for call to ‘ServerMediaSubsession::getRTPSinkandRTCP(void*&, RTPSink*&, const RTCPInstance*&)’
   fStreamStates[count].subsession->getRTPSinkandRTCP(fStreamStates[count].streamToken, Sink, Instance);
                                                                                                      ^
note: candidate is:
ServerMediaSubsession::getRTPSinkandRTCP(void*, const RTPSink*&, const RTCPInstance*&)

I've worked around it at the moment by using a const_cast on the returned RTPSink pointer to remove the 'const'-ness of it. This isn't ideal though.

Andy


From: live-devel <live-devel-bounces at us.live555.com> on behalf of Ross Finlayson <finlayson at live555.com>
Sent: 08 November 2023 09:33
To: LIVE555 Streaming Media - development & use <live-devel at us.live555.com>
Subject: Re: [Live-devel] Retrieving stats for ProxyServerMediaSession



> On Nov 8, 2023, at 1:23 AM, Andy Hawkins <Andy.Hawkins at uniguest.com> wrote:
>
> Hi,
>
> Thanks again, that's very helpful.
>
> One remaining issue, the 'getRTPSinkandRTCP' method in returns *const*​ pointers, but the RTPSink member 'getTotalBitrate' is not a const method, so can't be called from these pointers.

Correct.  “getTotalBitrate()” modifies the state of the object (to reset the ‘last called time’ and counter), so it can’t be const.

So, in the pseudo code I included in my last email, the declaration of “rtpSink” should have been
        RTPSink* rtpSink;
(at least, if you want to call “getTotalBitrate()”


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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