From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jaroslav Kysela <perex@perex.cz>
Subject: Re: PCM extra attributes
Date: Thu, 25 Jul 2013 10:06:52 +0200
Message-ID: <51F0DC9C.5090008@perex.cz>
References: <20130724170919.GD18642@intel.com>
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To: Vinod Koul <vinod.koul@intel.com>
Cc: Takashi Iwai <tiwai@suse.de>, alsa-devel@alsa-project.org, "Vinnakota,
 Lakshmi N <lakshmi.n.vinnakota@intel.com>"@vkoul-udesk3.iind.intel.com
List-Id: alsa-devel@alsa-project.org

Date 24.7.2013 19:09, Vinod Koul wrote:
> Hey Takashi,
> 
> We were looking to find the substream index in the userspace for the device
> opened (in case we support multiple substreams and mix them). Since we also
> wanted to have some specific alsa controls for each substream the problem of not
> knowing substream in usermode make stuff interesting!

The substream/subdevice index is in the snd_pcm_info field, so you can
correlate the PCM with the controls from the control API.

snd_pcm_info_get_subdevice()

					Jaroslav

-- 
Jaroslav Kysela <perex@perex.cz>
Linux Kernel Sound Maintainer
ALSA Project; Red Hat, Inc.