//////////////////////////////////////////////////////////////////////
//                                                                  //
// observerSound.pas: Sound waveform observer                       //
//                                                                  //
// The contents of this file are subject to the Bottled Light       //
// Public License Version 1.0 (the "License"); you may not use this //
// file except in compliance with the License. You may obtain a     //
// copy of the License at http://www.bottledlight.com/BLPL/         //
//                                                                  //
// Software distributed under the License is distributed on an      //
// "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or   //
// implied. See the License for the specific language governing     //
// rights and limitations under the License.                        //
//                                                                  //
// The Original Code is the Mappy VM User Interface, released       //
// April 1st, 2003. The Initial Developer of the Original Code is   //
// Bottled Light, Inc. Portions created by Bottled Light, Inc. are  //
// Copyright (C) 2001-2003 Bottled Light, Inc. All Rights Reserved. //
//                                                                  //
// Author(s):                                                       //
//   Michael Noland (joat), michael@bottledlight.com                //
//                                                                  //
// Changelog:                                                       //
//   1.0: First public release (April 1st, 2003)                    //
//                                                                  //
// Notes:                                                           //
//   This was intended only for debugging purposes, it is not       //
//   robust enough for production code as-is.                       //
//                                                                  //
//////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////
unit observerSound; //////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////
interface ////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, CheckLst, cpuObservers, console, ExtCtrls,
  Math, nexus, platformSound, AddressSpace;

//////////////////////////////////////////////////////////////////////

const
  BUFFER_SIZE = 44100 * 4;

type
  TjdevSoundViewer = class(TCpuObserver)
    procedure FormCreate(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure FormPaint(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    myData: array[0..BUFFER_SIZE-1] of uint8;
    myDataSize: integer;
  public
    procedure UpdateObserver; override;
    class function OCaption: string; override;
    procedure OnMoreSound(data: pointer; length: integer);
  end;

//////////////////////////////////////////////////////////////////////

var
  jdevSoundViewer: TjdevSoundViewer;

//////////////////////////////////////////////////////////////////////
implementation ///////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////

{$R *.DFM}

//////////////////////////////////////////////////////////////////////
// TjdevSoundViewer //////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////

class function TjdevSoundViewer.OCaption: string;
begin
  Result := 'Sound Viewer';
end;

//////////////////////////////////////////////////////////////////////

procedure TjdevSoundViewer.UpdateObserver;
var
  i: integer;
  s, h: single;
begin
  if (myDataSize > 0) and (ClientWidth > 0) and (ClientHeight > 0) then begin
    h := -ClientHeight / 256;
    s := ClientHeight;
    Canvas.Brush.Color := clBlack;
    Canvas.FillRect(Rect(0, 0, ClientWidth, ClientHeight));

    Canvas.Pen.Color := clBlue;
    Canvas.MoveTo(0, Trunc(s+h*myData[0]));
    for i := 0 to ClientWidth - 1 do begin
      Canvas.LineTo(i, Trunc(s+h*myData[Trunc(i/ClientWidth*myDataSize/2)*2]));
    end;

    Canvas.Pen.Color := clGreen;
    Canvas.MoveTo(0, Trunc(s+h*myData[1]));
    for i := 0 to ClientWidth - 1 do begin
      Canvas.LineTo(i, Trunc(s+h*myData[Trunc(i/ClientWidth*myDataSize/2)*2+1]));
    end;
  end;
  myDataSize := 0;
end;

//////////////////////////////////////////////////////////////////////

procedure TjdevSoundViewer.FormCreate(Sender: TObject);
begin
  HelpContext := LinkHelp('sound_viewer.html');
  myDataSize := 0;
  soundObserverCallback := OnMoreSound;
end;

//////////////////////////////////////////////////////////////////////

procedure TjdevSoundViewer.FormShow(Sender: TObject);
begin
  // Load the translation
  LoadTranslation(self, translation);
end;

//////////////////////////////////////////////////////////////////////

procedure TjdevSoundViewer.FormPaint(Sender: TObject);
begin
  updateObserver;
end;

//////////////////////////////////////////////////////////////////////

procedure TjdevSoundViewer.OnMoreSound(data: pointer; length: integer);
var
  oldSize: integer;
begin
  oldSize := myDataSize;
  myDataSize := Min(length*2, BUFFER_SIZE);
  Move(data^, myData[oldSize], myDataSize-oldSize);
end;

//////////////////////////////////////////////////////////////////////

procedure TjdevSoundViewer.FormDestroy(Sender: TObject);
begin
  soundObserverCallback := nil;
end;

//////////////////////////////////////////////////////////////////////

initialization
  RegisterViewer(TjdevSoundViewer);
end.

//////////////////////////////////////////////////////////////////////