unit AMixer;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
MMSystem
(* TAudioMixer v1.1 (FREEWARE component)
* ----------------
* Released 16 Nov 1998
* e-mail: vkovalcik@iname.com
* WWW: http://www.geocities.com/SiliconValley/Hills/1335/
so be sure to check TAudioMixer.MixerCount first. *)
type
TAudioMixer=class;
TPListFreeItemNotify=procedure (Pntr
ointer) of object;
TMixerChange=procedure (Sender:TObject;MixerH:HMixer;ID:Integer) of object;
TPointerList=class(TObject)
private
FOnFreeItem:TPListFreeItemNotify;
Items:Tlist;
protected
function GetPointer (Ind:Integer)
ointer;
function GetCount :integer;
public
constructor Create;
destructor Destroy;
override;
procedure Clear;
procedure Add (Pntr
ointer);
property Count:Integer read GetCount;
property Pointer[Ind:Integer]
ointer read GetPointer;
default;
property OnFreeItem:TPListFreeItemNotify read FOnFreeItem write FOnFreeItem;
end;
TMixerControls=class(TObject)
private
heap
ointer;
FControls:TPointerList;
protected
function GetControl (Ind:Integer)
MixerControl;
function GetCount:Integer;
public
constructor Create (AMixer:TAudioMixer;AData:TMixerLine);
destructor Destroy;
override;
property Control[Ind:Integer]
MixerControl read GetControl;
default;
property Count:Integer read GetCount;
end;
TMixerConnection=class(TObject)
private
XMixer:TAudioMixer;
FData:TMixerLine;
FControls:TMixerControls;
public
constructor Create (AMixer:TAudioMixer;AData:TMixerLine);
destructor Destroy;
override;
property Controls:TMixerControls read FControls;
property Data:TMixerLine read FData;
end;
TMixerConnections=class(TObject)
private
XMixer:TAudioMixer;
FConnections:TPointerList;
protected
proceduredo
FreeItem (Pntr
ointer);
function GetConnection (Ind:Integer):TMixerConnection;
function GetCount:Integer;
public
constructor Create (AMixer:TAudioMixer;AData:TMixerLine);
destructor Destroy;
override;
property Connection[Ind:Integer]:TMixerConnection read GetConnection;
default;
property Count:Integer read GetCount;
end;
TMixerDestination=class(TObject)
private
XMixer:TAudioMixer;
FData:TMixerLine;
FControls:TMixerControls;
FConnections:TMixerConnections;
public
constructor Create (AMixer:TAudioMixer;AData:TMixerLine);
destructor Destroy;
override;
property Connections:TMixerConnections read FConnections;
property Controls:TMixerControls read FControls;
property Data:TMixerLine read FData;
end;
TMixerDestinations=class(TObject)
private
FDestinations:TPointerList;
protected
function GetDestination (Ind:Integer):TMixerDestination;
proceduredo
FreeItem (Pntr
ointer);
function GetCount:Integer;
public
constructor Create (AMixer:TAudioMixer);
destructor Destroy;
override;
property Count:Integer read GetCount;
property Destination[Ind:Integer]:TMixerDestination read GetDestination;
default;
end;
TAudioMixer = class(TComponent)
private
XWndHandle:HWnd;
FDestinations:TMixerDestinations;
FMixersCount:Integer;
FMixerHandle:HMixer;
FMixerID:Integer;
FMixerCaps:TMixerCaps;
FOnLineChange:TMixerChange;
FOnControlChange:TMixerChange;
protected
procedure SetMixerID (Value:Integer);
procedure MixerCallBack (var Msg:TMessage);
procedure CloseMixer;
published
constructor Create (AOwner:TComponent);
override;
destructor Destroy;
override;
property MixerID:Integer read FMixerID write SetMixerID;
{Opened mixer - value must be in range 0..MixersCount-1
If no mixer is opened this value is -1}
property OnLineChange:TMixerChange read FOnLineChange write FOnLineChange;
property OnControlChange:TMixerChange read FOnControlChange write FOnControlChange;
public
function GetVolume (ADestination,AConnection:Integer;var LeftVol,RightVol,Mute:Integer;var VolDisabled,MuteDisabled:Boolean):Boolean;
{This function return volume of selected Destination and Connection.
ADestination must be from range 0..Destinations.Count-1
AConnection must be in range 0..Destinations[ADestination].Connections.Count-1
If you want to read master volume of some Destination, you have to
set AConnection to -1.
If LeftVol, RightVol or Mute is not supported by queried connection,
it's return value will be -1.
LeftVol and RightVol are in range 0..65536
If Mute is non-zero then
the connection is silent.
If specified line is recording source then
Mute specifies if programs will
record from this connection (it is copy of "Select" Checkbox in
standard Windows Volume Control program)
VolDisabled or MuteDisabled is True when you cannot apply settings to this
control (but can read it).
Return value of the function is True if no error has occured,
otherwise it returns False.}
function SetVolume (ADestination,AConnection:Integer;LeftVol,RightVol,Mute:Integer):Boolean;
{This function sets volume.
If you set RightVol to -1 and connection is stereo then
LeftVol will be
copied to RightVol.
If LeftVol or Mute is -1 then
this value will not be set.
Return value is True if ADestination and AConnection ar correct, otherwise False.}
property Destinations:TMixerDestinations read FDestinations;
{Ind must be in range 0..DestinationsCount-1}
property MixerCaps:TMixerCaps read FMixerCaps;
property MixerCount:Integer read FMixersCount;
{Number of mixers present in system;
mostly 1}
property MixerHandle:HMixer read FMixerHandle;
{Handle of opened mixer}
end;
procedure Register;
implementation
{------------}
{TPointerList}
{------------}
constructor TPointerList.Create;
begin
items:=tlist.create;
end;
destructor TPointerList.Destroy;
begin
Clear;
items.destroy;
end;
procedure TPointerList.Add (Pntr
ointer);
begin
items.add(Pntr);
end;
function TPointerList.GetPointer (Ind:Integer)
ointer;
begin
result:=items[Ind];
end;
procedure TPointerList.Clear;
var i:integer;
begin
for i:=0 to items.count-1do
begin
If Assigned (FOnFreeItem) then
FOnFreeItem (items
)
end;
items.clear;
end;
function TPointerList.GetCount:Integer;
begin
result:=items.count;
end;
{--------------}
{TMixerControls}
{--------------}
constructor TMixerControls.Create (AMixer:TAudioMixer;AData:TMixerLine);
var MLC:TMixerLineControls;
A,B:Integer;
PMixerControl;
begin
FControls:=TPointerList.Create;
MLC.cbStruct:=SizeOf(MLC);
MLC.dwLineID:=AData.dwLineID;
MLC.cControls:=AData.cControls;
MLC.cbmxctrl:=SizeOf(TMixerControl);
GetMem (P,SizeOf(TMixerControl)*AData.cControls);
heap:=P;
MLC.pamxctrl:=P;
A:=MixerGetLineControls(AMixer.MixerHandle,@MLC, MIXER_GETLINECONTROLSF_ALL);
If A=MMSYSERR_NOERROR then
begin
For B:=0 to AData.cControls-1do
begin
FControls.Add (P);
Inc (P);
end;
end;
end;
destructor TMixerControls.Destroy;
begin
FControls.free;
freemem(heap);
inherited;
end;
function TMixerControls.GetControl (Ind:Integer)MixerControl;
begin
Result:=FControls.Pointer[Ind];
end;
function TMixerControls.GetCount:Integer;
begin
Result:=FControls.Count;
end;
{----------------}
{TMixerConnection}
{----------------}
constructor TMixerConnection.Create (AMixer:TAudioMixer;AData:TMixerLine);
begin
FData:=AData;
XMixer:=AMixer;
FControls:=TMixerControls.Create (AMixer,AData);
end;
destructor TMixerConnection.Destroy;
begin
FControls.Free;
inherited;
end;
{-----------------}
{TMixerConnections}
{-----------------}
constructor TMixerConnections.Create (AMixer:TAudioMixer;AData:TMixerLine);
var A,B:Integer;
ML:TMixerLine;
begin
XMixer:=AMixer;
FConnections:=TPointerList.Create;
FConnections.OnFreeItem:=Dofreeitem;
ML.cbStruct:=SizeOf(TMixerLine);
ML.dwDestination:=AData.dwDestination;
For A:=0 to AData.cConnections-1do
begin
ML.dwSource:=A;
B:=MixerGetLineInfo (AMixer.MixerHandle,@ML,MIXER_GETLINEINFOF_SOURCE);
If B=MMSYSERR_NOERROR then
FConnections.Add(Pointer(TMixerConnection.Create (XMixer,ML)));
end;
end;
destructor TMixerConnections.Destroy;
begin
FConnections.Free;
inherited;
end;
procedure TMixerConnections.DoFreeItem (Pntrointer);
begin
TMixerConnection(Pntr).Free;
end;
function TMixerConnections.GetConnection (Ind:Integer):TMixerConnection;
begin
Result:=FConnections.Pointer[Ind];
end;
function TMixerConnections.GetCount:Integer;
begin
Result:=FConnections.Count;
end;
{-----------------}
{TMixerDestination}
{-----------------}
constructor TMixerDestination.Create (AMixer:TAudioMixer;AData:TMixerLine);
begin
FData:=AData;
XMixer:=AMixer;
FConnections:=TMixerConnections.Create (XMixer,FData);
FControls:=TMixerControls.Create (XMixer,AData);
end;
destructor TMixerDestination.Destroy;
begin
Fcontrols.free;
FConnections.Free;
inherited;
end;
{------------------}
{TMixerDestinations}
{------------------}
constructor TMixerDestinations.Create (AMixer:TAudioMixer);
var A,B:Integer;
ML:TMixerLine;
begin
FDestinations:=TPointerList.Create;
FDestinations.OnFreeItem:=DoFreeItem;
For A:=0 to AMixer.MixerCaps.cDestinations-1do
begin
ML.cbStruct:=SizeOf(TMixerLine);
ML.dwDestination:=A;
B:=MixerGetLineInfo (AMixer.MixerHandle,@ML,MIXER_GETLINEINFOF_DESTINATION);
If B=MMSYSERR_NOERROR then
FDestinations.Add(Pointer(TMixerDestination.Create (AMixer,ML)));
end;
end;
procedure TMixerDestinations.DoFreeItem (Pntrointer);
begin
TMixerDestination(Pntr).Free;
end;
destructor TMixerDestinations.Destroy;
begin
FDestinations.Free;
inherited;
end;
function TMixerDestinations.GetDestination (Ind:Integer):TMixerDestination;
begin
Result:=FDestinations.Pointer[Ind];
end;
function TMixerDestinations.GetCount:Integer;
begin
Result:=FDestinations.Count;
end;
{-----------}
{TAudioMixer}
{-----------}
constructor TAudioMixer.Create (AOwner:TComponent);
begin
inherited Create (AOwner);
FDestinations:=nil;
XWndHandle:=AllocateHWnd (MixerCallBack);
FMixersCount:=mixerGetNumDevs;
FMixerID:=-1;
If FMixersCount>0 then
SetMixerID (0);
end;
destructor TAudioMixer.Destroy;
begin
closemixer;
if XWndHandle<>0 then
DeAllocateHwnd(XWndHandle);
inherited;
end;
procedure TAudioMixer.CloseMixer;
begin
If FMixerID>=0 then
begin
mixerClose (FMixerHandle);
FMixerID:=-1;
end;
FDestinations.Free;
FDestinations:=nil;
end;
procedure TAudioMixer.SetMixerID (Value:Integer);
begin
If Value>=FMixersCount then
Exit;
CloseMixer;
If Value>=0 then
If mixerOpen (@FMixerHandle,Value,XWndHandle,0,CALLBACK_WINDOW OR MIXER_OBJECTF_MIXER)=MMSYSERR_NOERROR then
begin
FMixerID:=Value;
mixerGetDevCaps (MixerID,@FMixerCaps,SizeOf (TMixerCaps));
FDestinations:=TMixerDestinations.Create (Self);
end;
end;
procedure TAudioMixer.MixerCallBack (var Msg:TMessage);
begin
case Msg.Msg of
MM_MIXM_LINE_CHANGE:
If Assigned (OnLineChange) then
OnLineChange (Self,Msg.wParam,Msg.lParam);
MM_MIXM_CONTROL_CHANGE:
If Assigned (OnControlChange) then
OnControlChange (Self,Msg.wParam,Msg.lParam);
end;
end;
function TAudioMixer.GetVolume (ADestination,AConnection:Integer;var LeftVol,RightVol,Mute:Integer;var VolDisabled,MuteDisabled:Boolean):Boolean;
var MD:TMixerDestination;
MC:TMixerConnection;
Cntrls:TMixerControls;
MCD:TMixerControlDetails;
CntrlMixerControl;
A,B:Integer;
ML:TMixerLine;
details:array [0..30] of Integer;
begin
Result:=False;
MD:=Destinations[ADestination];
If MD<>nil then
begin
If AConnection=-1 then
begin
Cntrls:=MD.Controls;
ML:=MD.Data;
end
else
begin
MC:=MD.Connections[AConnection];
If MC<>nil then
begin
Cntrls:=MC.Controls;
ML:=MC.Data;
end
else
Cntrls:=nil;
end;
If Cntrls<>nil then
begin
A:=0;
Result:=True;
LeftVol:=-1;
RightVol:=-1;
Mute:=-1;
while ((LeftVol=-1) OR (Mute=-1)) AND (A<Cntrls.Count)do
begin
Cntrl:=Cntrls[A];
If Cntrl<>nil then
begin
If ((Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_VOLUME) OR
(Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_MUTE)) AND
(Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_MULTIPLE<>MIXERCONTROL_CONTROLF_MULTIPLE)
then
begin
MCD.cbStruct:=SizeOf(TMixerControlDetails);
MCD.dwControlID:=Cntrl.dwControlID;
If Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_UNIFORM>0 then
MCD.cChannels:=1
else
MCD.cChannels:=ML.cChannels;
MCD.cMultipleItems:=0;
MCD.cbDetails:=SizeOf(Integer);
MCD.paDetails:=@details;
B:=mixerGetControlDetails (FMixerHandle,@MCD,MIXER_GETCONTROLDETAILSF_VALUE);
If B=MMSYSERR_NOERROR then
begin
If (Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_VOLUME) AND (LeftVol=-1) then
begin
VolDisabled:=Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_DISABLED>0;
If not VolDisabled then
begin
LeftVol:=details[0];
If MCD.cChannels>1 then
RightVol:=Details[1];
end;
end
else
If (Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_MUTE) AND (Mute=-1) then
begin
MuteDisabled:=Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_DISABLED>0;
If not MuteDisabled then
begin
If Details[0]<>0 then
Mute:=1
else
Mute:=0;
end;
end;
end;
end;
end;
Inc (A);
end;
If Mute=-1 then
begin
If AConnection<>-1 then
begin
Cntrls:=MD.Controls;
ML:=MD.Data;
If Cntrls<>nil then
begin
A:=0;
while (Mute=-1) AND (A<Cntrls.Count)do
begin
Cntrl:=Cntrls[A];
If Cntrl.dwControlType AND MIXERCONTROL_CONTROLTYPE_MIXER=MIXERCONTROL_CONTROLTYPE_MIXER then
begin
MCD.cbStruct:=SizeOf(TMixerControlDetails);
MCD.dwControlID:=Cntrl.dwControlID;
If Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_UNIFORM>0 then
MCD.cChannels:=1
else
MCD.cChannels:=ML.cChannels;
If Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_MULTIPLE=MIXERCONTROL_CONTROLF_MULTIPLE then
MCD.cMultipleItems:=Cntrl.cMultipleItems
else
MCD.cMultipleItems:=0;
MCD.cbDetails:=4;
MCD.paDetails:=@Details;
B:=mixerGetControlDetails (FMixerHandle,@MCD,MIXER_GETCONTROLDETAILSF_VALUE);
If B=MMSYSERR_NOERROR then
Mute:=Details[AConnection];
end;
Inc (A);
end;
end;
end;
end;
If LeftVol=-1 then
VoldIsabled:=True;
If Mute=-1 then
MuteDisabled:=True;
end;
end;
end;
function TAudioMixer.SetVolume (ADestination,AConnection:Integer;LeftVol,RightVol,Mute:Integer):Boolean;
var MD:TMixerDestination;
MC:TMixerConnection;
Cntrls:TMixerControls;
MCD:TMixerControlDetails;
CntrlMixerControl;
A:Integer;
ML:TMixerLine;
details:array [0..30] of Integer;
VolSet,MuteSet:Boolean;
begin
Result:=False;
MD:=Destinations[ADestination];
If MD<>nil then
begin
If AConnection=-1 then
begin
Cntrls:=MD.Controls;
ML:=MD.Data;
end
else
begin
MC:=MD.Connections[AConnection];
If MC<>nil then
begin
Cntrls:=MC.Controls;
ML:=MC.Data;
end
else
Cntrls:=nil;
end;
If Cntrls<>nil then
begin
A:=0;
VolSet:=LeftVol=-1;
MuteSet:=Mute=-1;
Result:=True;
while (not VolSet OR not MuteSet) AND (A<Cntrls.Count)do
begin
Cntrl:=Cntrls[A];
If Cntrl<>nil then
begin
If ((Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_VOLUME) OR
(Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_MUTE)) AND
(Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_MULTIPLE<>MIXERCONTROL_CONTROLF_MULTIPLE)
then
begin
MCD.cbStruct:=SizeOf(TMixerControlDetails);
MCD.dwControlID:=Cntrl.dwControlID;
If Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_UNIFORM>0 then
MCD.cChannels:=1
else
MCD.cChannels:=ML.cChannels;
MCD.cMultipleItems:=0;
MCD.cbDetails:=SizeOf(Integer);
MCD.paDetails:=@Details;
If (Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_VOLUME) AND not VolSet then
begin
Details[0]:=LeftVol;
If RightVol=-1 then
Details[1]:=LeftVol
else
Details[1]:=RightVol;
VolSet:=True;
end
else
If (Cntrl.dwControlType=MIXERCONTROL_CONTROLTYPE_MUTE) AND not MuteSet then
begin
Details[0]:=Mute;
MuteSet:=True;
end;
mixerSetControlDetails (FMixerHandle,@MCD,MIXER_GETCONTROLDETAILSF_VALUE);
end;
end;
Inc (A);
end;
If not MuteSet then
begin
If AConnection<>-1 then
begin
Cntrls:=MD.Controls;
ML:=MD.Data;
If Cntrls<>nil then
begin
A:=0;
while not MuteSet AND (A<Cntrls.Count)do
begin
Cntrl:=Cntrls[A];
If Cntrl.dwControlType AND MIXERCONTROL_CONTROLTYPE_MIXER=MIXERCONTROL_CONTROLTYPE_MIXER then
begin
MCD.cbStruct:=SizeOf(TMixerControlDetails);
MCD.dwControlID:=Cntrl.dwControlID;
If Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_UNIFORM>0 then
MCD.cChannels:=1
else
MCD.cChannels:=ML.cChannels;
If Cntrl.fdwControl AND MIXERCONTROL_CONTROLF_MULTIPLE=MIXERCONTROL_CONTROLF_MULTIPLE then
MCD.cMultipleItems:=Cntrl.cMultipleItems
else
MCD.cMultipleItems:=0;
MCD.cbDetails:=4;
MCD.paDetails:=@Details;
MuteSet:=True;
mixerGetControlDetails (FMixerHandle,@MCD,MIXER_GETCONTROLDETAILSF_VALUE);
Details[AConnection]:=Mute;
mixerSetControlDetails (FMixerHandle,@MCD,MIXER_GETCONTROLDETAILSF_VALUE);
end;
Inc (A);
end;
end;
end;
end;
end;
end;
end;
procedure Register;
begin
RegisterComponents('Samples', [TAudioMixer]);
end;
end.
