From: dE <de.techno@gmail.com>
To: Alsa-devel@alsa-project.org
Subject: Re: What are subdevices?
Date: Mon, 27 Oct 2014 23:32:23 +0530 [thread overview]
Message-ID: <544E88AF.8090705@gmail.com> (raw)
In-Reply-To: <544CC58C.3080800@gmail.com>
On 10/26/14 15:27, dE wrote:
> On 10/26/14 14:41, Clemens Ladisch wrote:
>> dE wrote:
>>> A device seems like the output streams the sound card supports. Like
>>> HDMI, DP, analog etc...
>>>
>>> So what's a subdevice?
>> A subdevice is an output streams the sound card supports.
>>
>> Typically, a device has multiple subdevices if the card supports
>> hardware mixing; all
>> the subdevices end up at the same physical output.
>>
>>
>> Regards,
>> Clemens
>
> Ok, so a device list is a list of different streams the card can
> supports simultaneously and they'll be output via different channels
> without mixing.
>
> Thanks for clarifying this.
>
> But, typically cards have a single analog device but support
> multichannel output. So how does this work at the software level? If
> ALSA can't send multiple streams of audio to one device, then how does
> ALSA send separate output to different channels of the device?
>
> Is the PCM sent to the sound card codified? Is this the same way how
> stereo work?
No one knows?
next prev parent reply other threads:[~2014-10-27 18:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-26 8:14 What are subdevices? dE
2014-10-26 9:11 ` Clemens Ladisch
2014-10-26 9:57 ` dE
2014-10-27 18:02 ` dE [this message]
2014-10-27 19:46 ` Clemens Ladisch
2014-10-28 3:17 ` dE
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