Audio to speaker is elongated, prob. because 2-channel OPUS going to 1-channel SDL (macos arm)

[fwaris]

https://github.com/sipsorcery-org/SIPSorceryMedia.SDL2/blob/f93f40afe091fbc002a69ac7d67db18113036235/src/SDL2AudioEndPoint.cs#L94C17-L94C83

I think the number of channels should come from the selected audio format, rather than being hardcoded to 1.

[fwaris]

In copy of the class, I changed the line to get the channel count from the selected audio format and now the audio seems to be fine.

Please update source when you get a chance.