Master Volume Control

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2 total messages Started by Davide Puccioni Thu, 20 Jun 2002 07:27

#919

Author: Davide Puccioni
Date: Thu, 20 Jun 2002 07:27

9 lines
1169 bytes

Hi, everybody!
I've taken full control of wave volume, but how can I take control over 
Master Volume Control?

TIA.

Regards.

Davide Puccioni

Re: Master Volume Control

#920

Author: Michael Warner
Date: Thu, 20 Jun 2002 08:24

32 lines
2086 bytes

On Thu, 20 Jun 2002 09:27:06 +0200, Davide Puccioni
<davide.puccioni@audiodevices.com> wrote:

>Hi, everybody!
>I've taken full control of wave volume, but how can I take control over 
>Master Volume Control?

You need the dreaded audio mixer - see the multimedia help. There's
no substitute for understanding how it works, but here's some code
which locates the master volume control:

// master volume details
  ml.cbStruct = sizeof(ml);
  ml.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
  if
(mixerGetLineInfo(MixerHandle,&ml,MIXER_GETLINEINFOF_COMPONENTTYPE)) {
    mixerClose(MixerHandle); return false;       // no wave out line
  }
//  mlc.cbStruct = sizeof(mlc);
  mlc.dwLineID = ml.dwLineID;
//  mlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
//  mlc.cControls = 1;
//  mlc.cbmxctrl = sizeof(mc);
//  mlc.pamxctrl = &mc;
  if
(mixerGetLineControls(MixerHandle,&mlc,MIXER_GETLINECONTROLSF_ONEBYTYPE))
{
    mixerClose(MixerHandle); return false;       // no wave out line
  }
  MasterID = mc.dwControlID;
	mmax = mc.Bounds.dwReserved[1];      // compiler doesn't like
dxMaximum!

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