Right. And the likely reason is that such a differentiation doesn't help much.
I thought usage of this macro can tell applications that the PCM channels are not for surround sound.
But for this purpose, card configuration is better. Applications can get to know by seeking 'surround' PCM devices such like 'surround51'.
You can still use your device for driving 5.1 surround :)
It's not my intention. I'm considering about the way to prevent applications from using the devices for surround sound.
I don't prepare for card configuration. So devices which my drivers support have no 'surround' PCM devices.
So, I rather would like to keep them RIP. Maybe worth to remove it now.
Yes.
In the same reason, 'SND_PCM_SUBCLASS_MULTI_MIX' should be removed. As a result, 'SND_PCM_SUBCLASS_XXX', 'struct snd_pcm_info.dev_subclass' are also needless...
Thanks
Takashi Sakamoto o-takashi@sakamocchi.jp