D2: Win95 + Speaker + Sound := possible

最新推荐文章于 2024-08-15 00:30:33 发布

最新推荐文章于 2024-08-15 00:30:33 发布 · 109 阅读

本文深入探讨了音视频处理领域的关键技术，包括图像色彩空间、视频编解码算法、音频编解码算法等，并介绍了FFmpeg音视频编解码、硬件编解码、音频处理滤波等实际应用。

procedure Sound(Freq : Word);
var B : Byte;
begin if Freq > 18 then begin Freq := Word(1193181 div LongInt(Freq));
 B := Byte(GetPort($61));
 if (B and 3) = 0 then begin SetPort($61, Word(B or 3));
 SetPort($43, $B6);
 end;
 SetPort($42, Freq);
 SetPort($42, Freq shr 8);
 end;
end;
procedure NoSound;
var Value: Word;
begin Value := GetPort($61) and $FC;
 SetPort($61, Value);
end;
procedure SetPort(address, Value:Word);
var bValue: byte;
begin bValue := trunc(Value and 255);
 asm mov dx, address mov al, bValue out dx, al end;
end;
function GetPort(address:word):word;
var bValue: byte;
begin asm mov dx, address in al, dx mov bValue, al end;
 GetPort := bValue;
end;