[alsa-devel] Correct way to set NONAUDIO flag

Hello, I'm trying to figure out the right way to set the NONAUDIO flag on an iec958 device. The idea is that when we get a new stream in PulseAudio that signals a non-PCM format, we'd like to set the NONAUDIO flag to let receivers know that this isn't PCM data. I tried doing what iecset does in the PA alsa-sink code but this fails.

As far as I can tell, this happens because: (a) if I set the flag before snd_pcm_open(), the AES0 value from iec958.conf gets used, and (b) if I set the flag after snd_pcm_open(), changing the value is no longer permitted.

Any help/pointers would be appreciated.

Thanks, Arun