Editor hudby pre programy v pascale

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Kategória: KMP (Klub mladých programátorov)

Autor: Martin Koleček
Program: Editsnd.pas,  Speaker.pas
Potrebné: Manual_snd.txt

S programem EditSnd.exe je mozne generovat soubory s priponou SND. Tyto soubory maji slouzit k ozvuceni programu na profesionalni urovni pomoci PC Speakeru. Vyuziva se k tomu preruseni od casovace nastavene na 100Hz tzn. vzorkovaci frekvence prehravanych zvuku je 100Hz. Nedochazi ke zhrouceni hodin vse je osetreno tak aby sly prehravat zvuky, aby spravne sly hodiny a zaroven aby program mohl vykonavat jine ulohy. Vse bezi na pozadi pres int8 viz. unit speaker.pas.
{ SPEAKER.PAS                          Copyright (c) Martin Kolecek }
{ Tato unita nastavuje novou obsluhu preruseni 8 (timer) a nastavuje}
{ frekvenci timeru na 100Hz. Pak na pozadi hraje hudbu pres speaker.}
{                                                                   }
{ Author: Martin Kolecek                                            }
{ Datum: 18.05.2009                           http://www.trsek.com  }
 
Unit Speaker;
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Interface
 
  Procedure InitSound;
  Procedure ShutdownSound;
  Procedure LoadSNDFile(Filename:String);
  Procedure PlaySound(Sample:Byte);
  Function  FPS2s: Boolean; {pomoc pri vypoctu fps pomoci timeru}
 
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Implementation
Uses Crt,Dos;
{$F+}
Var
  BIOSTimerHandler: procedure;
  clock_ticks,counter: longint;
  F: File;
  SoundData: array[0..1999] of Word;
  ZvukTab: array[0..99] of Word;
  PrehravatZvuk: Boolean;
  CisloZvuku:Byte;
  Posuv: Word;
  fps_helper: Byte;
 
 
Procedure TimerHandler; Interrupt;
Begin
  {prehravani}
  If PrehravatZvuk=True then
  Begin
    If SoundData[ZvukTab[CisloZvuku*2]+Posuv]>0
    then Sound(SoundData[ZvukTab[CisloZvuku*2]+Posuv])
    else NoSound;
    Inc(Posuv);
    If Posuv>ZvukTab[CisloZvuku*2+1] then {prehrali jsme celou delku zvuku}
    Begin
      PrehravatZvuk:=False;
      Posuv:=0;
      NoSound;
    End
  End;
 
  {helper pro vypocet fps kazde 2 sekundy}
  If fps_helper<200 then Inc(fps_helper)
                    else fps_helper:=0;
 
  clock_ticks:=clock_ticks+counter;
  {volat BIOS obsluhu preruseni ?}
  If clock_ticks>=$10000 then
    Begin
      clock_ticks:=clock_ticks-$10000;
      asm pushf end;
      BIOSTimerHandler;
    End
    else Port[$20]:=$20; {konec preruseni}
End;
 
 
Procedure InitSound;
Begin
  fps_helper:=0;
  clock_ticks:=0;
  counter:=$1234DD div 100;
  GetIntVec(8,@BIOSTimerHandler);
  SetIntVec(8,Addr(TimerHandler));
  Port[$43]:=$34;
  Port[$40]:=counter mod 256;
  Port[$40]:=counter div 256;
  PrehravatZvuk:=False;
End;
 
 
Procedure ShutdownSound;
Begin
  Port[$43]:=$34;
  Port[$40]:=0;
  Port[$40]:=0;
  SetIntVec(8, @BIOSTimerHandler);
  PrehravatZvuk:=False;
End;
 
 
Procedure LoadSNDFile(Filename:String);
Begin
  Assign(F,Filename);
  Reset(F,1);
  BlockRead(F,SoundData,4000);
  BlockRead(F,ZvukTab,200);
  Close(F);
End;
 
 
Procedure PlaySound(Sample:Byte);
Begin
  PrehravatZvuk:=True; {sdelime handleru int8 ze chceme prehravat}
  CisloZvuku:=Sample;  {predame ktery zvuk se ma hrat}
  Posuv:=0;            {nastavime na zacatek zvuku}
End;
 
 
Function FPS2s: Boolean;
Begin
  If fps_helper<100 then FPS2s:=False {false v prvni vterine}
                    else FPS2s:=True; {true ve druhe vterine}
End;
 
 
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Begin End.