IQ input?

[windytan]

Reading IQ signals is currently a little complicated, and you need some external tools like csdr which is not actively maintained. Would it be useful to have an IQ input format?

On first thought, it could be as simple as adding something like --input iq_i16 and --input iq_f32. But these things would need to be sorted out first:

• Should the filter be adjustable or not
• How do we deal with the problem of "zero Hz peak" in some radios, or is it even a problem
• If user wants to read IQ from a WAV file, how do we tell apart MPX and IQ WAV files in a user-friendly way
• Redsea is single-threaded, so very slow computers may not be able to decode high-bandwidth IQ in real time; in this case an external tool is always better, if you have multiple cores