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.