Изменить громкость
Изменить громкость
Эта программа увеличивает громкость выбранного канала на 1000:
usesMMSystem;
procedure TForm1.Button1Click(Sender: TObject);
var
vol: longint;
LVol, RVol: integer;
begin
AuxGetVolume(ListBox1.ItemIndex, @Vol);
LVol := Vol shr 16;
if LVol < MaxWord - 1000 then
LVol := LVol + 1000
else
LVol := MaxWord;
RVol := (Vol shl 16) shr 16;
if RVol < MaxWord - 1000 then
RVol := RVol + 1000
else
RVol := MaxWord;
AuxSetVolume(ListBox1.ItemIndex, LVol shl 16 + RVol);
end;
procedure TForm1.FormCreate(Sender: TObject);
var
i: integer;
cap: TAuxCaps;
begin
for i := 0 to auxGetNumDevs - 1 do
begin
auxGetDevCaps(i, Addr(cap), SizeOf(cap));
ListBox1.Items.Add(cap.szPname)
end;
end;
procedure SetVolume(X: Word);
var
iErr: Integer;
i: integer;
a: TAuxCaps;
begin
for i := 0 to auxGetNumDevs do
begin
auxGetDevCaps(i, Addr(a), SizeOf(a));
if a.wTechnology = AUXCAPS_CDAUDIO then
break;
end;
// Устанавливаем одинаковую громкость для левого и правого каналов.
// VOLUME := LEFT*$10000 + RIGHT*1
iErr := auxSetVolume(i, (X * $10001));
if (iErr‹›0) then
ShowMessage('No audio devices are available!');
end;
function GetVolume: Word;
var
iErr: Integer;
i: integer;
a: TAuxCaps;
vol: word;
begin
for i := 0 to auxGetNumDevs do
begin
auxGetDevCaps(i, Addr(a), SizeOf(a));
if a.wTechnology = AUXCAPS_CDAUDIO then
break;
end;
iErr := auxGetVolume(i, addr(vol));
GetVolume := vol;
if (iErr‹›0) then
ShowMessage('No audio devices are available!');
end;
unit Volumes;
interface
uses
Windows, Messages, Classes, ExtCtrls, ComCtrls, MMSystem;
const
CDVolume = 0;
WaveVolume = 1;
MidiVolume = 2;
type
TVolumeControl = class(TComponent)
private
FDevices : array[0..2] of Integer;
FTrackBars : array[0..2] of TTrackBar;
FTimer : TTimer;
function GetInterval: Integer;
procedure SetInterval(AInterval: Integer);
function GetVolume(AIndex: Integer): Byte;
procedure SetVolume(AIndex: Integer; aVolume: Byte);
procedure InitVolume;
procedure SetTrackBar(AIndex: Integer; ATrackBar: TTrackBar);
{ Private declarations }
procedure Update(Sender: TObject);
procedure Changed(Sender: TObject);
protected
{ Protected declarations }
procedure Notification(AComponent: TComponent; AOperation:
TOperation); override;
public
{ Public declarations }
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
published
{ Published declarations }
property Interval: Integer read GetInterval write SetInterval default
500;
property CDVolume: Byte index 0 read GetVolume write SetVolume stored
False;
property CDTrackBar: TTrackBar index 0 read FTrackBars[0] write
SetTrackBar;
property WaveVolume: Byte index 1 read GetVolume write SetVolume
stored False;
property WaveTrackBar: TTrackBar index 1 read FTrackBars[1] write
SetTrackBar;
property MidiVolume: Byte index 2 read GetVolume write SetVolume
stored False;
property MidiTrackBar: TTrackBar index 2 read FTrackBars[2] write
SetTrackBar;
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('Any', [TVolumeControl]);
end;
type
TVolumeRec = record
case Integer of
0: (LongVolume: Longint);
1: (LeftVolume,
RightVolume : Word);
end;
function TVolumeControl.GetInterval: Integer;
begin
Result := FTimer.Interval;
end;
procedure TVolumeControl.SetInterval(AInterval: Integer);
begin
FTimer.Interval := AInterval;
end;
function TVolumeControl.GetVolume(AIndex: Integer): Byte;
var Vol: TVolumeRec;
begin
Vol.LongVolume := 0;
if FDevices[AIndex] < > -1 then
case AIndex of
0: auxGetVolume(FDevices[AIndex], @Vol.LongVolume);
1: waveOutGetVolume(FDevices[AIndex], @Vol.LongVolume);
2: midiOutGetVolume(FDevices[AIndex], @Vol.LongVolume);
end;
Result := (Vol.LeftVolume + Vol.RightVolume) shr 9;
end;
procedure TVolumeControl.SetVolume(aIndex: Integer; aVolume: Byte);
var Vol: TVolumeRec;
begin
if FDevices[AIndex] < > -1 then
begin
Vol.LeftVolume := aVolume shl 8;
Vol.RightVolume := Vol.LeftVolume;
case AIndex of
0: auxSetVolume(FDevices[AIndex], Vol.LongVolume);
1: waveOutSetVolume(FDevices[AIndex], Vol.LongVolume);
2: midiOutSetVolume(FDevices[AIndex], Vol.LongVolume);
end;
end;
end;
procedure TVolumeControl.SetTrackBar(AIndex: Integer; ATrackBar:
TTrackBar);
begin
if ATrackBar < > FTrackBars[AIndex] then
begin
FTrackBars[AIndex] := ATrackBar;
Update(Self);
end;
end;
AOperation: TOperation);
var I: Integer;
begin
inherited Notification(AComponent, AOperation);
if (AOperation = opRemove) then
for I := 0 to 2 do if (AComponent = FTrackBars[I])
then FTrackBars[I] := Nil;
end;
procedure TVolumeControl.Update(Sender: TObject);
var I: Integer;
begin
for I := 0 to 2 do
if Assigned(FTrackBars[I]) then
with FTrackBars[I] do
begin
Min := 0;
Max := 255;
if Orientation = trVertical
then Position := 255 - GetVolume(I)
else Position := GetVolume(I);
OnChange := Self.Changed;
end;
end;
constructor TVolumeControl.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FTimer := TTimer.Create(Self);
FTimer.OnTimer := Update;
FTimer.Interval := 500;
InitVolume;
end;
destructor TVolumeControl.Destroy;
var I: Integer;
begin
FTimer.Free;
for I := 0 to 2 do
if Assigned(FTrackBars[I]) then
FTrackBars[I].OnChange := Nil;
inherited Destroy;
end;
procedure TVolumeControl.Changed(Sender: TObject);
var I: Integer;
begin
for I := 0 to 2 do
if Sender = FTrackBars[I] then
with FTrackBars[I] do
begin
if Orientation = trVertical
then SetVolume(I, 255 - Position)
else SetVolume(I, Position);
end;
end;
procedure TVolumeControl.InitVolume;
var AuxCaps : TAuxCaps;
WaveOutCaps : TWaveOutCaps;
MidiOutCaps : TMidiOutCaps;
I,J : Integer;
begin
FDevices[0] := -1;
for I := 0 to auxGetNumDevs - 1 do
begin
auxGetDevCaps(I, @AuxCaps, SizeOf(AuxCaps));
if (AuxCaps.dwSupport and AUXCAPS_VOLUME) < > 0 then
begin
FTimer.Enabled := True;
FDevices[0] := I;
break;
end;
end;
FDevices[1] := -1;
for I := 0 to waveOutGetNumDevs - 1 do
begin
waveOutGetDevCaps(I, @WaveOutCaps, SizeOf(WaveOutCaps));
if (WaveOutCaps.dwSupport and WAVECAPS_VOLUME) < > 0 then
begin
FTimer.Enabled := True;
FDevices[1] := I;
break;
end;
end;
FDevices[2] := -1;
for I := 0 to midiOutGetNumDevs - 1 do
begin
MidiOutGetDevCaps(I, @MidiOutCaps, SizeOf(MidiOutCaps));
if (MidiOutCaps.dwSupport and MIDICAPS_VOLUME) < > 0 then
begin
FTimer.Enabled := True;
FDevices[2] := I;
break;
end;
end;
end;
end.
Выставь на форму 2 тракбара и двигай их. Если у тебя звучит музыка, ты должен услышать изменения громкости правого и левого каналов.
procedure TForm1.TrackBar1Change(Sender: TObject);
var
s: dword;
a,b: word;
h: hWnd;
begin
a:=trackbar1.position;
b:=trackbar2.position;
s:=(a shl 16) or b;
waveOutSetVolume(h,s);
end;
свойство Max в каждом TrackBar'e должно равняться 65535 (то есть MaxWord)
