[alsa-devel] [PATCH 07/11] ucm: docs: Add CaptureChannelMap

[Jaroslav Kysela]

Dne 07. 11. 19 v 2:58 Curtis Malainey napsal(a):
> Add ucm value to tell userspace to remap channels. This is useful for
> systems with DMICs where there may be more channels than active
> channels.
> 
> Signed-off-by: Curtis Malainey <cujomalainey at chromium.org>
> ---
>   include/use-case.h | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/include/use-case.h b/include/use-case.h
> index 1aeaf9d4..31f9e4be 100644
> --- a/include/use-case.h
> +++ b/include/use-case.h
> @@ -301,6 +301,10 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
>    *      - name of capture mixer
>    *   - CaptureMixerID
>    *      - mixer capture ID
> + *   - CaptureChannelMap
> + *      - Remap channels using ALSA PCM channel mapping API notation
> + *        E.g. "2 3 0 1 -1 -1 -1 -1 -1 -1 -1" means, FL takes channel 2,
> + *        FR takes channel 3, RL takes channel 0, RL takes channel 1.
>    *   - EDIDFile
>    *      - Path to EDID file for HDMI devices
>    *   - JackControl, JackDev, JackHWMute
> 

I see a room for the improvement to have a better and complete mapping 
description like:

CaptureChannelMap "FR=0 RL=1 TC=2"

The location names should follow SND_CHMAP defines.

					Jaroslav

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