合并两个格式相同的WAV文件

合并两个格式相同的WAV文件

时间:2011-6-2来源:yang 作者: peng点击: 6次

type
  TWavFormat = packed record
    ChunkID: array[0..3] of Char; //‘RIFF‘
    ChunkSize: Longword; // file size - 8 [bytes]
    Format: array[0..3] of Char; // ‘WAVE‘
    SubChunk1ID: array[0..3] of Char; // ‘fmt ‘   mind the space!
    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 [bytes]
    BitsPerSample: Word; // BytesperSample *8
    SubChunk2ID: array[0..3] of Char; //‘data‘
    SubChunk2Size: Longword; //number of data bytes
  end;
 
function ConcatWavFile(AWavFile1, AWavFile2, ANewFile: string): Boolean;
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(PChar(AWavFile1), OF_READ or OF_SHARE_DENY_NONE);
  vFileHandle2 := _lopen(PChar(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; //格式不相同
    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; { ConcatWavFile }
 
procedure TForm1.Button1Click(Sender: TObject);
begin
  ConcatWavFile(‘c:\windows\media\chord.wav‘, ‘c:\windows\media\chimes.wav‘,
    ‘c:\temp\temp.wav‘);
end;