Как прочитать заголовок wav файла?

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 4 bytes
  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;

With this structure you can get all the information's about a wave file you want to.
After this header following the wave data which contains the data for playing the wave file.
Now we trying to get the information's from a wave file. To be sure it's really a wave file, we test the information's:

function GetWaveHeader(FileName: TFilename): TWaveHeader;

const

 riff = 'RIFF';

 wave = 'WAVE';

var

 f: TFileStream;

 w: TWaveHeader;

begin

 if not FileExists(Filename) then

  exit; //exit the function if the file does not exists

 try

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

  f.Read(w, Sizeof(w)); //Reading the file header

  if w.ident1 <> riff then

  begin //Test if it is a RIFF file, otherwise exit

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

  exit;

  end;

  if w.ident2 <> wave then

  begin //Test if it is a wave file, otherwise exit

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

  exit;

  end;

 finally

  f.free;

 end;

 Result := w;

end;

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

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