soundkarte ohne bass.dll

[igel457]

mache es so:

Delphi-Quellcode:

  const
    Mono       : Word = $0001;
    RiffId     : string = 'RIFF';
    WaveId     : string = 'WAVE';
    FmtId      : string = 'fmt ';
    DataId     : string = 'data';

type
  TWaveFile = class
    WaveFormatEx : TWaveFormatEx;
    MS           : TMemoryStream;
    TempInt,
    DataCount,
    RiffCount    : integer;
    SoundValue   : byte;
    w            : double; // omega ( 2 * pi * frequency)
    duration     : integer;
    samplerate   : integer;
  constructor Create;
  procedure AddHeader(HSampleRate,HDuration:Integer);
  procedure AddData  (Freq,HDuration:Integer);
  procedure SaveToFile(FileName:String);
  procedure Play;
  destructor Free;
end;

constructor TWaveFile.Create;
begin
  inherited Create;
  MS := TMemoryStream.Create;
  samplerate := 11025;
end;

destructor TWaveFIle.Free;
begin
    MS.Free;
end;

procedure TWaveFile.AddHeader(HSampleRate,HDuration:integer);
begin
  duration := hduration;
  samplerate := HSampleRate;
  with WaveFormatEx do begin
    wFormatTag := WAVE_FORMAT_PCM;
    nChannels := Mono;
    nSamplesPerSec := SampleRate;
    wBitsPerSample := $0008;
    nAvgBytesPerSec := nSamplesPerSec * nBlockAlign;
    nBlockAlign := (nChannels * wBitsPerSample) div 8;
    cbSize := 0;
  end;
  with MS do begin

    {Calculate length of sound data and of file data}
    DataCount := (Duration *  SampleRate) div 1000;  // sound data
    RiffCount := Length(WaveId)
                 + Length(FmtId) + SizeOf(DWord)
                 + SizeOf(TWaveFormatEx)
                 + Length(DataId) + SizeOf(DWord)
                 + DataCount; // file data
    {write out the wave header}
    Write(RiffId[1], 4);                        // 'RIFF'
    Write(RiffCount, SizeOf(DWord));            // file data size
    Write(WaveId[1], Length(WaveId));           // 'WAVE'
    Write(FmtId[1], Length(FmtId));             // 'fmt '
    TempInt := SizeOf(TWaveFormatEx);
    Write(TempInt, SizeOf(DWord));              // TWaveFormat data size
    Write(WaveFormatEx, SizeOf(TWaveFormatEx)); // WaveFormatEx record
    Write(DataId[1], Length(DataId));           // 'data'
    Write(DataCount, SizeOf(DWord));            // sound data size
  end;
end;

procedure TWaveFile.AddData(Freq,HDuration:integer);
var i :integer;
begin
    w := 2 * Pi * Freq;  // omega
    for i := 0 to hduration*samplerate div 1000 - 1 do begin
      // wt = w *i /SampleRate
      SoundValue := 127 + trunc(127 * sin(i * w / SampleRate));
      MS.Write(SoundValue, SizeOf(Byte));
    end;
end;

procedure TWavefile.SaveToFile(FileName:String);
begin
    MS.Seek(0, soFromBeginning);
    MS.SaveToFile(Filename);
end;

procedure TWaveFile.Play;
begin
    sndPlaySound(MS.Memory, SND_MEMORY or SND_SYNC);
end;

Ein Beispiel:
Du möchtest eine Frequenz erzeugen von 400 hz und 1 sekunde dann

Delphi-Quellcode:

  wavefile := TWaveFile.Create;
  wavefile.addheader(44100,1000);
  wavefile.adddata(400,1000);
  wavefile.play;

ich hoffe das ist was du meinst!

Was willst du genau machen?