Q:codec based config file?

Q:codec based config file?

["Tien, C.L. - 田承禮"]

Hi,

There are chip-based config file in /usr/share/alsa/cards, but they are based on driver name.
For example all USB audio will need to search USB-Audio.conf, while AC97 codec with ICH4
will need to search ICH4.conf.

Since more and more codecs (USB, AC97 and HDA) can appear on the same bus, can this be changed
to support config file based on the codec id? There are many codecs with different
capabilities that may needs separate config files.

Sincerely,
ChenLi Tien


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Re: Q:codec based config file?

[Takashi Iwai]

At Thu, 3 Mar 2005 06:40:22 +0800,
Tien, C.L. wrote:
> 
> Hi,
> 
> There are chip-based config file in /usr/share/alsa/cards, but they are based on driver name.
> For example all USB audio will need to search USB-Audio.conf, while AC97 codec with ICH4
> will need to search ICH4.conf.
> 
> Since more and more codecs (USB, AC97 and HDA) can appear on the same bus, can this be changed
> to support config file based on the codec id? There are many codecs with different
> capabilities that may needs separate config files.

Yes, that's a problem right now.

The usb, ac97 and hda-codec drivers already add an ID string to
card_info.components list so that user-space lib/app can look at it.
So, we'll need just a few hook up in alsa-lib to look up the ID and
checks the preferred device/codec-specific config in prior to the card
(driver name) config.

I thought I'll work on this issue after 1.0.9 release, but of course,
pathes are always welcome ;)


Takashi


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