At Sat, 24 Aug 2002 03:41:56 -0500,
Mark Rages wrote:
>
> On Sat, Aug 24, 2002 at 02:54:46AM -0500, Mark Rages wrote:
> > A quick question, as I'm tired of reading source:
> >
> > I can adjust the volume of my driver with either alsamixer or aumix.
> >
> > Using the OSS output plugin for XMMS, however, the volume control on XMMS
> > has no effect.
> >
> > Besides trading XMMS for Alsaplayer, what can I do to fix this? The same
> > setup works fine with my AWE32. (I referred to the sb_mixer code when
> > adding the volume control)
> >
> > Does the OSS mixer emulation look for the first control to emulate as
> > master volume? Else, how does it choose?
>
> Following up:
>
> This card has two stereo PCM outputs.
>
> After a little experimentation, I find that if I name one mixer "PCM" and
> the other "Master" I get the desired operation.
>
> However, I want them to show as "PCM 1+2" and "PCM 3+4" in alsamixer etc.
you can use the different indices for the same control name.
this is the common case.
> Is there some way to hint the alsa oss mixer emulation code?
so far, no. i'm thinking of adding it, too...
on the current cvs code, you can change this mapping via proc file.
(please see my recent post)
> Also, I have code like this (borrowed from sb_mixer.c):
>
> static snd_kcontrol_new_t snd_wave4_controls_double[] = {
> { iface: SNDRV_CTL_ELEM_IFACE_MIXER,
> name: "PCM",
> info: snd_wave4_mixer_info_double,
> get: snd_wave4_mixer_get_double,
> put: snd_wave4_mixer_put_double,
> private_value: 0
> },
> { iface: SNDRV_CTL_ELEM_IFACE_MIXER,
> name: "Master",
> info: snd_wave4_mixer_info_double,
> get: snd_wave4_mixer_get_double,
> put: snd_wave4_mixer_put_double,
> private_value: 1
> }
> };
>
> static int snd_wave4_mixer_init_double(wave4_t *wave4, char *name) {
> int i, err;
>
> for (i = 0; i < 2; i++) {
> if ((err = snd_ctl_add(wave4->card,
> snd_ctl_new1(&snd_wave4_controls_double[i],
> wave4))) < 0)
> return err;
> }
>
> snd_component_add(wave4->card, name);
> strcpy(wave4->card->mixername, name);
>
> return 0;
> }
>
> So what are all these names? Can I use different names to get what I want?
> - The one in snd_kcontrol_t
this appears as a control (e.g. mixer) element.
> - the one passed to snd_component_add
this is used to check the validity of components when a card consists
of sevaral different parts.
you can use a unique string id for each part. for example, ac97 codec
adds a component "AC97".
> - the one in card->mixername
the name of mixer chip.
inquired via snd_ctl_card_info_get_mixername() in alsa-lib api.
Takashi
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