More mixer questions

More mixer questions

[Adrian McMenamin]

Sorry to hit the list with another question about the mixer/control
stuff, but I'm pretty puzzled as to what I am getting wrong.

I am using mpg123 compiled to only hack oss, so I am reliant on oss
emulation.

I have the control code attached below, which defines both master and
pcm functions (mapped together as the device only plays PCM).

By default I get this:

/ # cat /proc/asound/card0/oss_mixer
VOLUME "" 0
BASS "" 0
TREBLE "" 0
SYNTH "" 0
PCM "" 0
SPEAKER "" 0
LINE "" 0
MIC "" 0
CD "" 0
IMIX "" 0
ALTPCM "" 0
RECLEV "" 0
IGAIN "" 0
OGAIN "" 0
LINE1 "" 0
LINE2 "" 0
LINE3 "" 0
DIGITAL1 "" 0
DIGITAL2 "" 0
DIGITAL3 "" 0
PHONEIN "" 0
PHONEOUT "" 0
VIDEO "" 0
RADIO "" 0
MONITOR "" 0

ie nothing mapped against oss. But if I do this:
echo 'VOLUME "PCM" 0' > /proc/asound/card0/oss_mixer
or
echo 'VOLUME "Master" 0' > /proc/asound/card0/oss_mixer

Then I get control of gain... so why doesn't the mapping work by
default?


/* Mixer controls */
static int aica_pcmswitch_info(snd_kcontrol_t * kcontrol,
			       snd_ctl_elem_info_t * uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 1;
	return 0;
}

static int aica_pcmswitch_get(snd_kcontrol_t * kcontrol,
			      snd_ctl_elem_value_t * ucontrol)
{
	ucontrol->value.integer.value[0] = 1;	/* TO DO: Fix me */
	return 0;
}

static int aica_pcmswitch_put(snd_kcontrol_t * kcontrol,
			      snd_ctl_elem_value_t * ucontrol)
{
	if (ucontrol->value.integer.value[0] == 1)
		return 0;	/* TO DO: Fix me */
	else
		aica_chn_halt();
	return 0;
}

static snd_kcontrol_new_t snd_aica_masterswitch_control __devinitdata =
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Master Playback Switch",
	.info = aica_pcmswitch_info,
	.get = aica_pcmswitch_get,
	.put = aica_pcmswitch_put
};

static snd_kcontrol_new_t snd_aica_pcmswitch_control __devinitdata = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Playback Switch",
	.index = 0,
	.info = aica_pcmswitch_info,
	.get = aica_pcmswitch_get,
	.put = aica_pcmswitch_put
};




static int aica_pcmvolume_info(snd_kcontrol_t * kcontrol,
			       snd_ctl_elem_info_t * uinfo)
{

	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 0xFF;

	return 0;
}

static int aica_pcmvolume_get(snd_kcontrol_t * kcontrol,
			      snd_ctl_elem_value_t * ucontrol)
{
	if (!channel)
		return -ETXTBSY;	/* we've not yet been set up */
	ucontrol->value.integer.value[0] = channel->vol;
	return 0;
}

static int aica_pcmvolume_put(snd_kcontrol_t * kcontrol,
			      snd_ctl_elem_value_t * ucontrol)
{
	if (!channel) {
		snd_printk("No channel yet\n");
		return -ETXTBSY;	/* too soon */
	}

	else if (channel->vol == ucontrol->value.integer.value[0])
		return 0;

	else {
		channel->vol = ucontrol->value.integer.value[0];
		dreamcastcard->master_volume = ucontrol->value.integer.value[0];
		spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
			    (uint8_t *) channel, sizeof(aica_channel_t));
	}
	return 1;
}

static snd_kcontrol_new_t snd_aica_mastervolume_control __devinitdata =
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Master Playback Volume",
	.info = aica_pcmvolume_info,
	.get = aica_pcmvolume_get,
	.put = aica_pcmvolume_put
};

static snd_kcontrol_new_t snd_aica_pcmvolume_control __devinitdata = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Playback Volume",
	.index = 0,
	.info = aica_pcmvolume_info,
	.get = aica_pcmvolume_get,
	.put = aica_pcmvolume_put
};






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Re: More mixer questions

[Lee Revell]

On Sun, 2006-04-02 at 00:18 +0100, Adrian McMenamin wrote:
> Sorry to hit the list with another question about the mixer/control
> stuff, but I'm pretty puzzled as to what I am getting wrong.
> 
> I am using mpg123 compiled to only hack oss, so I am reliant on oss
> emulation.
> 
> I have the control code attached below, which defines both master and
> pcm functions (mapped together as the device only plays PCM).

Where's your __devinit snd_aica_mixer() routine that actually creates
the mixer controls, with snd_ctl_new1()?

Look at snd_emu10k1_mixer in alsa-kernel/pci/emu10k1/emumixer.c for
example...

Lee



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Re: More mixer questions

[Adrian McMenamin]

On Sat, 2006-04-01 at 22:09 -0500, Lee Revell wrote:
> On Sun, 2006-04-02 at 00:18 +0100, Adrian McMenamin wrote:
> > Sorry to hit the list with another question about the mixer/control
> > stuff, but I'm pretty puzzled as to what I am getting wrong.
> > 
> > I am using mpg123 compiled to only hack oss, so I am reliant on oss
> > emulation.
> > 
> > I have the control code attached below, which defines both master and
> > pcm functions (mapped together as the device only plays PCM).
> 
> Where's your __devinit snd_aica_mixer() routine that actually creates
> the mixer controls, with snd_ctl_new1()?

The controls do work though, and they are being created - the code
fragment is below (with lots of printks for debugging)

static int __devinit add_aicamixer_controls()
{
	int err;
	err = snd_ctl_add
	     (dreamcastcard->card,
	      snd_ctl_new1(&snd_aica_pcmvolume_control,
			   dreamcastcard));
	     if (err < 0){
		snd_printk("pcmvolume failed\n");
		return err;
	     }
	    
	    err= snd_ctl_add
	     (dreamcastcard->card,
	      snd_ctl_new1(&snd_aica_pcmswitch_control,
			   dreamcastcard));
	     if (err < 0){
		snd_printk("pcmswitch failed\n");
		return err;
	     }

	    
	    err = snd_ctl_add
	     (dreamcastcard->card,
	      snd_ctl_new1(&snd_aica_mastervolume_control,
			   dreamcastcard));
	     if (err < 0){
		snd_printk("mastervolume failed\n");
		return err;
	     }

	    
	    err = snd_ctl_add
	     (dreamcastcard->card,
	      snd_ctl_new1(&snd_aica_masterswitch_control,
			   dreamcastcard));
	     if (err < 0){
		snd_printk("masterswitch failed\n");
		return err;
	     }

	    
	  
	/* succeeded */
	return 0;
}





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