Głośność ogólna

0

Jak odczytać poziom ogólnej głośności i jak nim sterować czyli nadać cicho lub w cale itp :)

0

Po wygooglowaniu linku do http://www.swissdelphicenter.ch/en/showcode.php?id=1630 tam jest poszukałem
na google "delphi setmastervolume" i znalazłem stronę o poniższym adresie, na której jest kod i wszystkie
procedury działają, a przynajmniej pod XP i Delphi 7 sprawdziłem. Miłego regulowania głośności ;)

http://www.delphi-forum.de/to[...]b2d02b24b5be4bfcf3b47c150768c

function InitMixer: HMixer;
var
  Err: MMRESULT;
begin
  Err := mixerOpen(@Result, 0, 0, 0, 0);
  if Err <> MMSYSERR_NOERROR then
    Result := 0;
end;

function GetMasterVolumeControl(Mixer: hMixerObj;
                                var Control: TMixerControl): MMResult;
var
  Line     : TMixerLine;
  Controls : TMixerLineControls;
begin
  ZeroMemory(@Line, SizeOf(Line));
  Line.cbStruct := SizeOf(Line);
  Line.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
  Result := mixerGetLineInfo(Mixer,
                             @Line,
                             MIXER_GETLINEINFOF_COMPONENTTYPE);
  if Result = MMSYSERR_NOERROR then begin
    ZeroMemory(@Controls, SizeOf(Controls));
    Controls.cbStruct := SizeOf(Controls);
    Controls.dwLineID := Line.dwLineID;
    Controls.cControls := 1;
    Controls.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
    Controls.cbmxctrl := SizeOf(Control);
    Controls.pamxctrl := @Control;
    Result := mixerGetLineControls(Mixer,
                                   @Controls,
                                   MIXER_GETLINECONTROLSF_ONEBYTYPE);
  end;
end;

function SetMasterVolume(Value: Cardinal) : boolean;
var
  MasterVolume    : TMixerControl;
  Details         : TMixerControlDetails;
  UnsignedDetails : TMixerControlDetailsUnsigned;
  Code            : MMResult;
  Mixer           : hMixerObj;
begin
  Mixer := InitMixer;
  Result := false;
  Code := GetMasterVolumeControl(Mixer, MasterVolume);
  if(Code = MMSYSERR_NOERROR)then begin
    with Details do begin
      cbStruct := SizeOf(Details);
      dwControlID := MasterVolume.dwControlID;
      cChannels := 1;  // set all channels
      cMultipleItems := 0;
      cbDetails := SizeOf(UnsignedDetails);
      paDetails := @UnsignedDetails;
    end;
    UnsignedDetails.dwValue := Value;
    if(mixerSetControlDetails(Mixer,
                              @Details,
                              MIXER_SETCONTROLDETAILSF_VALUE) = MMSYSERR_NOERROR)then
      Result := true;
  end;
end;

function GetMasterVolume : Cardinal;
var
  MasterVolume    : TMixerControl;
  Details         : TMixerControlDetails;
  UnsignedDetails : TMixerControlDetailsUnsigned;
  Code            : MMResult;
  Mixer           : hMixerObj;
begin
  Mixer := InitMixer;
  Result := 0;
  Code := GetMasterVolumeControl(Mixer, MasterVolume);
  if(Code = MMSYSERR_NOERROR)then begin
    with Details do begin
      cbStruct := SizeOf(Details);
      dwControlID := MasterVolume.dwControlID;
      cChannels := 1;  // set all channels
      cMultipleItems := 0;
      cbDetails := SizeOf(UnsignedDetails);
      paDetails := @UnsignedDetails;

    end;
    if(mixerGetControlDetails(Mixer,
                              @Details,
                              MIXER_GETCONTROLDETAILSF_VALUE) = MMSYSERR_NOERROR)then
      result := UnsignedDetails.dwValue;
  end;
end;

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