合并两个 Wav 文件的函数

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



{合并两个 Wav 文件的函数}

function ConWavFile(AWavFile1, AWavFile2, ANewFile: string): Boolean;

type

  TWavFormat = packed record

    ChunkID: array[0..3] of AnsiChar;     {'RIFF'}

    ChunkSize: Longword;                  {size-8}

    Format: array[0..3] of AnsiChar;      {'WAVE'}

    SubChunk1ID: array[0..3] of AnsiChar; {'fmt '}

    SubChunk1Size: Longword;              {hex10}

    AudioFormat: Word;                    {hex 01}

    NumOfChannels: Word;                  {1 mono, 2 stereo}

    SampleRate: Longword;                 {number of samples/sec}

    ByteRate: Longword;                   {samplerate* num of channels*bytes per (mono) sample}

    BytesperSample: Word;                 {size of (mono) sample}

    BitsPerSample: Word;                  {BytesperSample *8}

    SubChunk2ID: array[0..3] of AnsiChar; {'data'}

    SubChunk2Size: Longword;              {number of data bytes}

  end;

var

  vWavFormat1: TWavFormat;

  vWavFormat2: TWavFormat;

  vFileHandle1: THandle;

  vFileHandle2: THandle;

  vFileStream1: TFileStream;

  vFileStream2: TFileStream;

  vChunkSize1, vChunkSize2: Integer;

begin

  Result := False;

  if not FileExists(AWavFile1) then Exit;

  if not FileExists(AWavFile2) then Exit;



  vFileHandle1 := _lopen(PAnsiChar(AnsiString(AWavFile1)), OF_READ or OF_SHARE_DENY_NONE);

  vFileHandle2 := _lopen(PAnsiChar(AnsiString(AWavFile2)), OF_READ or OF_SHARE_DENY_NONE);



  if (Integer(vFileHandle1) <= 0) or (Integer(vFileHandle2) <= 0) then

  begin

    _lclose(vFileHandle1);

    _lclose(vFileHandle2);

    Exit;

  end;



  vFileStream1 := TFileStream.Create(vFileHandle1);

  vFileStream2 := TFileStream.Create(vFileHandle2);

  try

    if vFileStream1.Read(vWavFormat1, SizeOf(TWavFormat)) <> SizeOf(TWavFormat) then Exit;

    if vFileStream2.Read(vWavFormat2, SizeOf(TWavFormat)) <> SizeOf(TWavFormat) then Exit;

    if vWavFormat1.ChunkID <> 'RIFF' then Exit;

    if vWavFormat1.SubChunk2ID <> 'data' then Exit;

    vChunkSize1 := vWavFormat1.SubChunk2Size;

    vChunkSize2 := vWavFormat2.SubChunk2Size;

    vWavFormat1.ChunkSize := 0;

    vWavFormat1.SubChunk2Size := 0;

    vWavFormat2.ChunkSize := 0;

    vWavFormat2.SubChunk2Size := 0;

    if not CompareMem(@vWavFormat1, @vWavFormat2, SizeOf(TWavFormat)) then Exit; {格式不同}

    with TMemoryStream.Create do try

      vWavFormat1.ChunkSize := vChunkSize1 + vChunkSize2 + SizeOf(vWavFormat1) - 8;

      vWavFormat1.SubChunk2Size := vChunkSize1 + vChunkSize2;

      Write(vWavFormat1, SizeOf(TWavFormat));

      CopyFrom(vFileStream1, vChunkSize1);

      CopyFrom(vFileStream2, vChunkSize2);

      try

        SaveToFile(ANewFile);

      except

        Exit;

      end;

    finally

      Free;

    end;

  finally

    vFileStream1.Free;

    vFileStream2.Free;

  end;

  Result := True;

end; { ConWavFile End}





{测试}

procedure TForm1.Button1Click(Sender: TObject);

var

  Wav1,Wav2,WavDest: string;

begin

  Wav1 := 'c:\temp\1.wav';

  Wav2 := 'c:\temp\2.wav';

  WavDest := 'c:\temp\12.wav';

  if ConWavFile(Wav1, Wav2, WavDest) then

    ShowMessageFmt('''%s'' 和 ''%s'' 已成功合并到 ''%s''', [Wav1,Wav2,WavDest]);

end;



end.