Thank you for reply.

I mean, I create input with pa_simple_new(NULL, "MyApp", PA_STREAM_RECORD, NULL, device, "record", &m_format, NULL, NULL, &error), where m_format and error are some variables and device (type: const char*) is THE device. If it is NULL, it is default and all works, if it is string identifying device (for example "source.hw1.monitor"), it doesn't work like I described above. That was mine point.

GStreamer - ok, that is next library I'll try if this won't work, thank you for suggesting. (But first I'll try to figure out how to do it with PA, because I'm really running out of time and I have not so much time to learn yet another library :3.)