Пример использования DirectSound на Delphi

Рабочий пример использования DirectSound на Delphi + несколько полезных процедур. В этом примере создается один первичный SoundBuffer и 2 статических, вторичных; в них загружаются 2 WAV файла. Первичный буфер создается процедурой AppCreateWritePrimaryBuffer, а любой вторичный - AppCreateWritePrimaryBuffer. Так как вторичный буфер связан с WAV файлом, то при создании буфера нужно определить его параметры в соответствии со звуковым файлом, эти характеристики (Samples, Bits, IsStereo) задаются в виде параметров процедуры. Time - время WAV'файла в секундах (округление в сторону увеличения).
unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Classes, Graphics, Controls,
 Forms, Dialogs, DSound, MMSystem, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
 Button1: TButton;
 Timer1: TTimer;
 procedure FormCreate(Sender: TObject);
 procedure FormDestroy(Sender: TObject);
 procedure Button1Click(Sender: TObject);
 private
 { Private declarations }
 DirectSound: IDirectSound;
 DirectSoundBuffer: IDirectSoundBuffer;
 SecondarySoundBuffer: array[0..1] of IDirectSoundBuffer;
 procedure AppCreateWritePrimaryBuffer;
 procedure AppCreateWriteSecondaryBuffer(var Buffer: IDirectSoundBuffer;
 SamplesPerSec: Integer;
 Bits: Word;
 isStereo: Boolean;
 Time: Integer);
 procedure AppWriteDataToBuffer(Buffer: IDirectSoundBuffer;
 OffSet: DWord; var SoundData;
 SoundBytes: DWord);
 procedure CopyWAVToBuffer(Name: PChar; var Buffer: IDirectSoundBuffer);
 public
 { Public declarations }
 end;
var
 Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.FormCreate(Sender: TObject);
begin
 if DirectSoundCreate(nil, DirectSound, nil) <> DS_OK then
 raise Exception.Create('Failed to create IDirectSound object');
 AppCreateWritePrimaryBuffer();
 AppCreateWriteSecondaryBuffer(SecondarySoundBuffer[0], 22050, 8, False, 10);
 AppCreateWriteSecondaryBuffer(SecondarySoundBuffer[1], 22050, 16, True, 1);
end;
procedure TForm1.FormDestroy(Sender: TObject);
var
 i: ShortInt;
begin
 if Assigned(DirectSoundBuffer) then DirectSoundBuffer.Release;
 for i := 0 to 1 do
 if Assigned(SecondarySoundBuffer[i]) then SecondarySoundBuffer[i].Release;
 if Assigned(DirectSound) then DirectSound.Release;
end;
procedure TForm1.AppWriteDataToBuffer;
var
 AudioPtr1, AudioPtr2: Pointer;
 AudioBytes1, AudioBytes2: DWord;
 h: HResult;
 Temp: Pointer;
begin
 H := Buffer.Lock(OffSet, SoundBytes, AudioPtr1, AudioBytes1, AudioPtr2, AudioBytes2, 0);
 if H = DSERR_BUFFERLOST then
 begin
 Buffer.Restore();
 if Buffer.Lock(OffSet, SoundBytes, AudioPtr1, AudioBytes1, AudioPtr2, AudioBytes2, 0) <> DS_OK then
 raise Exception.Create('Unable to Lock Sound Buffer');
 end
 else if H <> DS_OK then
 raise Exception.Create('Unable to Lock Sound Buffer');
 Temp := @SoundData;
 Move(Temp^, AudioPtr1^, AudioBytes1);
 if AudioPtr2 <> nil then
 begin
 Temp := @SoundData; Inc(Integer(Temp), AudioBytes1);
 Move(Temp^, AudioPtr2^, AudioBytes2);
 end;
 if Buffer.UnLock(AudioPtr1, AudioBytes1, AudioPtr2, AudioBytes2) <> DS_OK
 then raise Exception.Create('Unable to UnLock Sound Buffer');
end;
procedure TForm1.AppCreateWritePrimaryBuffer;
var
 BufferDesc: DSBUFFERDESC;
 Caps: DSBCaps;
 PCM: TWaveFormatEx;
begin
 FillChar(BufferDesc, SizeOf(DSBUFFERDESC), 0);
 FillChar(PCM, SizeOf(TWaveFormatEx), 0);
 with BufferDesc do
 begin
 PCM.wFormatTag := WAVE_FORMAT_PCM;
 PCM.nChannels := 2;
 PCM.nSamplesPerSec := 22050;
 PCM.nBlockAlign := 4;
 PCM.nAvgBytesPerSec := PCM.nSamplesPerSec
 PCM.wBitsPerSample := 16;
 PCM.cbSize := 0;
 dwSize := SizeOf(DSBUFFERDESC);
 dwFlags := DSBCAPS_PRIMARYBUFFER;
 dwBufferBytes := 0;
 lpwfxFormat := nil;
 end;
 if DirectSound.SetCooperativeLevel(Handle, DSSCL_WRITEPRIMARY) <> DS_OK then
 raise Exception.Create('Unable to set Coopeative Level');
 if DirectSound.CreateSoundBuffer(BufferDesc, DirectSoundBuffer, nil) <> DS_OK then
 raise Exception.Create('Create Sound Buffer failed');
 if DirectSoundBuffer.SetFormat(PCM) <> DS_OK then
 raise Exception.Create('Unable to Set Format ');
 if DirectSound.SetCooperativeLevel(Handle, DSSCL_NORMAL) <> DS_OK then
 raise Exception.Create('Unable to set Coopeative Level');
end;
procedure TForm1.AppCreateWriteSecondaryBuffer;
var
 BufferDesc: DSBUFFERDESC;
 Caps: DSBCaps;
 PCM: TWaveFormatEx;
begin
 FillChar(BufferDesc, SizeOf(DSBUFFERDESC), 0);
 FillChar(PCM, SizeOf(TWaveFormatEx), 0);
 with BufferDesc do
 begin
 PCM.wFormatTag := WAVE_FORMAT_PCM;
 if isStereo then
 PCM.nChannels := 2
 else
 PCM.nChannels := 1;
 PCM.nSamplesPerSec := SamplesPerSec;
 PCM.nBlockAlign := (Bits div 8) * PCM.nChannels;
 PCM.nAvgBytesPerSec := PCM.nSamplesPerSec * PCM.nBlockAlign;
 PCM.wBitsPerSample := Bits;
 PCM.cbSize := 0;
 dwSize := SizeOf(DSBUFFERDESC);
 dwFlags := DSBCAPS_STATIC;
 dwBufferBytes := Time * PCM.nAvgBytesPerSec;
 lpwfxFormat := @PCM;
 end;
 if DirectSound.CreateSoundBuffer(BufferDesc, Buffer, nil) <> DS_OK then
 raise Exception.Create('Create Sound Buffer failed');
end;
procedure TForm1.CopyWAVToBuffer;
var
 Data: PChar;
 FName: TFileStream;
 DataSize: DWord;
 Chunk: string[4];
 Pos: Integer;
begin
 FName := TFileStream.Create(Name, fmOpenRead);
 Pos := 24;
 SetLength(Chunk, 4);
 repeat
 FName.Seek(Pos, soFromBeginning);
 FName.Read(Chunk[1], 4);
 Inc(Pos);
 until Chunk = 'data';
 FName.Seek(Pos + 3, soFromBeginning);
 FName.Read(DataSize, SizeOf(DWord));
 GetMem(Data, DataSize);
 FName.Read(Data^, DataSize);
 FName.Free();
 AppWriteDataToBuffer(Buffer, 0, Data^, DataSize);
 FreeMem(Data, DataSize);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
 CopyWAVToBuffer('1.wav', SecondarySoundBuffer[0]);
 CopyWAVToBuffer('flip.wav', SecondarySoundBuffer[1]);
 if SecondarySoundBuffer[0].Play(0, 0, 0) <> DS_OK then
 ShowMessage('Can not play the Sound');
 if SecondarySoundBuffer[1].Play(0, 0, 0) <> DS_OK then
 ShowMessage('Can not play the Sound');
end;
end.
Source: http://blackman.wp-club.net/
ID: 03595
Category:Звук