On 01/03/2017 04:09 AM, Mengdong Lin wrote:
On 01/03/2017 04:21 PM, Vinod Koul wrote:
On Tue, Jan 03, 2017 at 02:09:18PM +0800,
mengdong.lin@xxxxxxxxxxxxxxx wrote:
From: Mengdong Lin <mengdong.lin@xxxxxxxxxxxxxxx>
Users can provide prosition info of audio devices as a device value.
This
will help the sound server to choose an audio devices from some
candidates
based on the their locations and the status of the machine.
This is good thing to have but some bits are bit unclear to me atm.
When you
say device, do you mean sound card?
No, the device here does not mean a sound card, but mean an I/O device
like speaker or dmic, defined by 'SectionDevice'.
For me, position makes sense for dmics and speakers. So can you help
me out
by understanding how we can describe these...
For example, if there are two DMICs, one is in the front and one on
the back, we can define their positions as below:
SectionDevice."MainMIC" {
...
EnableSequence [
...
]
DisableSequence [
...
]
Value {
Position "Front"
}
}
SectionDevice."SecondaryMIC" {
...
EnableSequence [
...
]
DisableSequence [
...
]
Value {
Position "Back"
}
}
What is the entity that will make use of the position information? For
what purpose? This type of information needs to be known at a lower
level (typically a DSP), I wonder what UCM would do with it?
Also it can be tricky to define left and right for a tablet which works
in all possible orientations, you'd need sensor information to refine
the position. And last if you have a mic or speaker array you'd need to
provide geometrical information?
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