Re: [Alsa-user] Help on specifying 'chmap' in asound.conf

[Sergei S. <ste...@li...>]

For that matter, which ALSA source files do the parsing ? From my 
old/distant memories, ALSA is silent about mistakes made by user when 
the user provides various configuration files. So, there must be a way 
to resolve the issue of silent ignoring of user mistakes.

A possible temporary solution would be to "trace" (e.g. by inserting 
diagnostic print statements) parsing of provided by user configuration 
files, and to implement this one has to know where to insert the 
diagnostic print statements, and that's why I'm asking the question.

--Sergei.

On 7/16/24 18:57, Takashi Iwai wrote:
> On Tue, 16 Jul 2024 08:09:21 +0200,
> Xinhui Zhou wrote:
>> Dear all,
>>
>>     I am having a question regarding how to specify 'champ' for a
>> plugin.  I do not see any examples of this. I tried many ways to
>> specify but failed.
>>
>>    As indicated by the link below,   I can specify the MAP as a string
>> array.   Can someone provide one example on how exactly this    [chmap
>> MAP]  can be specified?
>>
>> "
>> pcm.name {
>>          type cras
>>      [chmap MAP]     # Provide channel maps; MAP is a string array
>> }
>> "
>> https://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html
>>
>>
>> I can something like these, but none of these work for me.
>>
>> chmap LFE
>> chmap "LFE"
>> chmap FR,FL,LFE
>> champ "FR,FL,LFE"
> You need to define a composite array, e.g. pass like
>      chmap [ "FL,FR" ]
> instead.
>
> For multiple configurations, you can put more items such as
>      chmap [ "FC" "FL,FR" "FL,FR,FC,LFE" ]
>
>
> HTH,
>
> Takashi
>
>
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