I use the faad2 library:
https://github.com/knik0/faac/

It works perfectly to decode + play via Portaudio aac files.

The plan now is to do, like for libmpg123 and libopus, web streaming of aac files.

I did try with this site but others give the same result:
https://radiorecord.hostingradio.ru/ps96.aacp
The connection to the url file is ok and done via pipe-stream.

NeAACDecOpen() is ok.

NeAACDecSetConfiguration() was set with:
defObjectType = LC and defSampleRate = 44100

NeAACDecInit(), using the buffer of the pipe is ok and gives:
SampleRate = 44100 and Channels = 2.

But with NeAACDecDecode(), using buffer (minimum 4096 ko) from pipe, nothing is decoded and the result of frame_info is:

frame_info.channels = 1536
frame_info.error = 0
frame_info.samplerate = 0

What did I wrong?

Thanks.