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
    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);
{ Private declarations }
  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.

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