Как разрезать wav файл?

type
 TWaveHeader = record
  ident1: array[0..3] of Char; // Must be "RIFF"
  len: DWORD; // remaining length after this header
  ident2: array[0..3] of Char; // Must be "WAVE"
  ident3: array[0..3] of Char; // Must be "fmt "
  reserv: DWORD; // Reserved Size
  wFormatTag: Word; // format type
  nChannels: Word; // number of channels (i.e. mono, stereo, etc.)
  nSamplesPerSec: DWORD; //sample rate
  nAvgBytesPerSec: DWORD; //for buffer estimation
  nBlockAlign: Word; //block size of data
  wBitsPerSample: Word; //number of bits per sample of mono data
  cbSize: Word; //the count in bytes of the size of
  ident4: array[0..3] of Char; //Must be "data"
end;

You can load the file header with this function:

function GetWaveHeader(FileName: TFilename): TWaveHeader;

const

 riff = 'RIFF';

 wave = 'WAVE';

var

 f: TFileStream;

 w: TWaveHeader;

begin

 if not FileExists(Filename) then

  exit;

 try

  f := TFileStream.create(Filename, fmOpenRead);

  f.Read(w, Sizeof(w));

  if w.ident1 <> riff then

  begin

  Showmessage('This is not a RIFF File');

  exit;

  end;

  if w.ident2 <> wave then

  begin

  Showmessage('This is not a valid wave file');

  exit;

  end;

 finally

  f.free;

 end;

 Result := w;

end;

Now we have all for creating the code for spliting the wave file:

function SplitWave(Source, Dest1, Dest2: TFileName; Pos: Integer): Boolean;

var

 f1, f2, f3: TfileStream;

 w: TWaveHeader;

 p: Integer;

begin

 Result:=False

 if not FileExists(Source) then

  exit;

 try

  w := GetWaveHeader(Source);

  p := Pos - Sizeof(TWaveHeader);

  f1 := TFileStream.create(Source, fmOpenRead);

  f2 := TFileStream.create(Dest1, fmCreate);

  f3 := TFileStream.create(Dest2, fmCreate);

  {++++++++++Create file 1 ++++++++++++++++}

  w.len := p;

  f2.Write(w, Sizeof(w));

  f1.position := Sizeof(w);

  f2.CopyFrom(f1, p);

  {++++++++++++++++++++++++++++++++++++++++}

  {+++++++++++Create file 2 +++++++++++++++}

  w.len := f1.size - Pos;

  f3.write(w, Sizeof(w));

  f1.position := Pos;

  f3.CopyFrom(f1, f1.size - pos);

  {++++++++++++++++++++++++++++++++++++++++}

 finally

  f1.free;

  f2.free;

  f3.free;

 end;

 Result:=True;

end;

Взято с Delphi Knowledge Base: http://www.baltsoft.com/

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