Re: [Xen-devel] [PATCH v5] sndif: add ABI for Para-virtual sound

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

On Thu, Jan 22, 2015 at 5:41 PM, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Oleksandr Dmytryshyn writes ("[PATCH v5] sndif: add ABI for Para-virtual 
> sound"):
>> This is ABI for the two halves of a Para-virtual
>> sound driver to communicate with each to other.
> ...
>> + * Request open - open an pcm stream for playback or capture:
>
> So "channels" here is "stereo", "mono", etc.
>
> There doesn't seem to be anything in this interface that distinguishes
> different input/output devices.
>
> So for example, much real hardware will have a headphone output and
> also built-in speakers, and a mic input and built-in microphone.
>
> How is this to be exposed to the guest ?
Every stream handled in the own thread in the frontend driver.
Frontend sends command (read or write, etc) to the backend and
this is blocking command (within current stream). So I just
use different streams for playback and capture. In case if we have
headphone output and also built-in speakers, and a mic input and
built-in microphone we will use one stream for the headphone output,
one stream for the built-in speakers and one stream for the mic input.
And in this time all devices will be able to work simultaneously.


> Ian.

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