Date: Mon, 18 Sep 2000 01:20:07 +0100 From: "Cameron Grant" <gandalf@vilnya.demon.co.uk> To: "Doug Ambrisko" <ambrisko@whistle.com>, "Taku YAMAMOTO" <taku@cent.saitama-u.ac.jp> Cc: "Doug Ambrisko" <ambrisko@whistle.com>, <multimedia@FreeBSD.ORG> Subject: Re: AC97_MIXER_MONO (was Re: Anyone with i810 hardware?) Message-ID: <006e01c02106$33389340$0504020a@haveblue> References: <200009161948.MAA43474@whistle.com>
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> | How about mapping SOUND_MIXER_PHONEOUT to AC97_MIX_MONO?
> | With having SOUND_MIXER_PHONEOUT initial value in
> | snd_mixerdefaults[] (/sys/dev/sound/pcm/mixer.c) will work.
>
> Actually I have done that, and should work however it would require
> application level support, for example "mixer" doesn't support
> modifying that parameter:
please see ac97.c rev 1.11. support is added for all channels handled by
the codec. AC97_MIX_MONO is mapped to SOUND_MIXER_PHONEOUT, AC97_MIX_PHONE
to SOUND_MIXER_PHONEIN, anD AC97_MIX_PHONES to SOUND_MIXER_MONITOR. 'mixer'
does support all of these.
> It is something that I considered and may do however it requires
application
> changes. Just mapping AC97_MIX_MONO to SOUND_MIXER_VOLUME then lets
> me adjust things via "mixer vol" and requires no application changes
> (but does require a small kernel change).
>
> Also the reason that I like the idea of using ac97mixtable_entry for
> everything is that it gives a clean consistant point of reference.
> I found in ac97.c that uses both the AC97_MIX_MASTER and
> ac97mixtable_entry[SOUND_MIXER_VOLUME]. It was a trivial change
> to switch AC97_MIX_MASTER to be ac97mixtable_entry[SOUND_MIXER_VOLUME].reg
> and then get rid of AC97_MIX_MASTER in the code.
drivers should only be using the functions listed in ac97.h to control the
codec, never writing directly to it.
-cg
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