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unit Main;

{
  The simple demo of DTFM decode
  Author:  Eugen Tarasov

  There is main unit.
  This demo uses dspDTMF unit.

  Last modified - May, 2003

  Please send all suggestions and comments to author.

  e-mail: dsplab@teworks.com
  http://www.teworks.com
}

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Wave, dspDTMF;

type
  TfmMain = class(TForm)
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    Label1: TLabel;
    Edit1: TEdit;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure FormDestroy(Sender: TObject);

  private
    DTMF: TdspDTMF; // DTMF decoder (see the dspDTMF unit)
    procedure OnTone(Sender: TObject; Tone: Char);
  end;

var
  fmMain: TfmMain;

implementation

{$R *.dfm}

procedure TfmMain.FormCreate(Sender: TObject);
begin
  Caption:= Application.Title;
  DTMF:= TdspDTMF.Create;
  DTMF.OnTone:= OnTone;
end;

procedure TfmMain.FormDestroy(Sender: TObject);
begin
  DTMF.Free;
end;


procedure TfmMain.Button1Click(Sender: TObject);
var
  B: Byte;
  S: SmallInt;
  Wave: TWaveFileStream;
begin
  if OpenDialog1.Execute then
  begin
    Edit1.Text:= '';
    Wave:= TWaveFileStream.Create(OpenDialog1.FileName, fmOpenRead);
    try
      Wave.Open(false);
      if Wave.Format.nChannels <> 1 then
      begin
        MessageDlg('This demo supports Mono files only', mtWarning, [mbCancel], 0);
        Edit1.Text:= 'Format not supported';
        Exit;
      end;

      DTMF.SampleRate:= Wave.Format.nSamplesPerSec;
      DTMF.Initialize;

      Caption:= 'Searching for tones...';
      Application.ProcessMessages;
      try
        if Wave.Format.wBitsPerSample = 8 then
        begin
          DTMF.Threshold:= 1; // Set amplitude threshold
          while Wave.Read(B, 1) = 1 do DTMF.Put(B)
        end else
        begin
          DTMF.Threshold:= 100; // Set amplitude threshold
          while Wave.Read(S, 2) = 2 do DTMF.Put(S);
        end;

        DTMF.Finilize;
      finally
        Caption:= Application.Title;
      end;
    finally
      Wave.Free;
      if Edit1.Text = '' then Edit1.Text:= 'not found...';
    end;
  end;
end;


procedure TfmMain.OnTone(Sender: TObject; Tone: Char);
begin
  Edit1.Text:= Edit1.Text + Tone;
end;

end.