30 Oct
2014
30 Oct
'14
5:08 a.m.
As I learn't in this mailng list, a device can typically handle only one
stream at a time unless it supports hardware mixing which's exposed via subdevices in ALSA
What does subdevice mean for input device? Do they mark physical ports
for input? If not how do I record from a specific input port? Is it automatically selected by the card?
And what's 'input source' in ALSA mixer?
'Input source' usually found in those desktop using hda codec with two or more ADC since hda support multistreaming
Most sound card only support one analog capture device with 'Capture Source' control
Most notebook with hda codec have auto mic enabled by default, the capture source is determined by jack detection