welle.io Integration

[AlbrechtL]

Thanks for the great library!

I tried to integrate v3beta into welle.io to replace the code of qt-dab. You can find the code inside the welle.io branch sdrdab-test. The first prototype is working roughly under Linux and the Windows version compiles. Binaries can be found here.

I ran into the following issues:

• The rtl-sdr AGC in rtl_data_feeder.c is not working for strong signals (if the ADC run into saturation). I solved it by implementing an adapter class which makes it possible to use the original welle.io input sources.
• During the station change sdrdab freezes sometimes or crashes.
• Channel (frequency) change is not possible because sdrdab Scheduler::Stop() method doesn't cleanup the Scheduler successfully. If the method Scheduler::Start() is called after a Stop() sdrdab freezes.
• It seems that sdrdab has problem to sync with low SNR signals. I have IQ recordings that can be successfully decoded by qt-dab/welle.io master but not by sdrdab.
• Under Windows sdrdab freezes immediately after Scheduler::Start()

To integrate sdrdab into welle.io the following changes inside sdrdab where necessary:

• Replaced gstreamer with libfaad and QMultimedia
• Added possibility to display error counter (super frame, RS, CRC)
• Added possibility to display the spectrum

A discussion about the integration can be found at issue: https://github.com/AlbrechtL/welle.io/issues/102

It would be nice if you can help to integrate sdrdab into welle.io.

[AlbrechtL]

I renamed the branch to sdrdab-test and I updated the above post.