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How to use Opus codec in iOS

I am working on a simple voip application for iOS and need to use opus codec. As far as I know opus codec is only available in C. There seems to be no way in Xcode to compile opus codec for iOS platform. How can I use opus codec in my iOS project? Do I need to compile everything from the source using cmake? And if so, does Xcode have cmake support?
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by nmd007.
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Adding 3rd party C/C++ libraries to clang's path permanently

homebrew for m1 Macs installs C/C++ libraries under /opt/homebrew/include and /opt/homebrew/lib - which are not recognized by clang on m1 macs. I tried exporting CFLAGS as an environment variable as follows: export CFLAGS=-I/opt/homebrew/include to make clang see 3rd party libraries. clang still doesn't recognize the path. So what's the solution?
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by nmd007.
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C library to access speakers and microphone.

I need a low-latency framework/library for accessing microphone and speakers in a Mac. There are several frameworks/libraries available by Apple. My problem is these libraries seem to work either with Objective-C or Swift. I need a library/framework that works with plain C to access speakers and microphone. Something like ALSA in Linux. Thanks,
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by nmd007.
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