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delphi2007:"Invalid floating point operation" 错误的解决方法

2011-08-01 09:11 495 查看
这两天用使用海思的库hi_h264dec_w.dll(版本v2.2.2.0.2)解码时,在直接拷贝时出现"Invalid floating point operation.”的错误;

目前根据网络资料,屏蔽FPU错误,由于功能正常,因此具体原因还没有去分析,代码如下:

function TVideoDecoder.DecodeVideoFrame(var frame: H264_frame): boolean;

var

fOutFrame: H264_DEC_FRAME_S; //解码帧

iy, iuv: integer; //yuv长度,u的长度

Saved8087CW: Word;//Default 8087 control word. FPU control register is set to this value.

begin

Saved8087CW := Get8087CW; //保存当前

try

Set8087CW($133F); { Disable all fpu exceptions. }

result := DecodeVideoFrame(fOutFrame);

if not result then exit;

frame.FrameNo := fDecFrameCount;

frame.Width := foutframe.uWidth;

frame.Height := foutframe.uHeight;

frame.FrameRate := 25; //默认

frame.PicType := fDecAttr.uPictureFormat;

//拷贝 I420的yuv数据

iy := foutframe.uHeight * foutframe.uYStride;

iuv := foutframe.uHeight * foutframe.uUVStride div 2;

frame.datalen := iy + 2 * iuv;

getmem(frame.data, frame.datalen + 10);

copymemory(frame.data, foutframe.pY, iy);//不设置FPU,那么这句会报错

copymemory(frame.data + iy, foutframe.pu, iuv);

copymemory(frame.data + iy + iuv, foutframe.pv, iuv);

{$IFDEF __SaveH264}

if result then

fYuvStream.Write(frame.data[0], frame.datalen);

{$ENDIF}

finally

Set8087CW(Saved8087CW); //恢复

end;

end;

关于FPU的设置,有几个建议:

1)It is recommend that you disable all floating-point exceptions when using OpenGL to render 3D graphics;

2)如果在程序中使用了SceneControl.LoadSxFile载入了3D文档,那么必须在程序退出时,在Set8087CW之前调用IScene的ClearLayers方法清除图层,否则程序在退出时会出现异常。参考代码为:SceneControl1.Scene.ClearLayers;

参考文档(非常感谢以下文章):

1) http://www.langjisky.com/netdown/?type=detail&id=99

2) /article/5780507.html
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