Draw frame from FFMpeg
lazarus / 70-OpenGL

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RedCat · 2020-04-19 11:56

Kind time of the day, the question of drawing using OpenGL means a
frame received from the ffmpeg decoder (continuation of this topic:htt
ps://forum.lazarus.freepascal.org/index.php/topic,49196.msg356348.html
#msg356348) I listened to the tips that were given to me and tried to
manually copy the bytes, it seemed to work better than with direct
rendering of data from the decoder, but still it is not drawn as it
should and I used pixel-by-pixel copying, which is very slow
here is the code:Code: Pascal  [Select][+][-]window.onload =
function(){var x1 = document.getElementById("main_content_section");
if (x1) { var x = document.getElementsByClassName("geshi");for (var i
= 0; i procedure SwapTB(dataIN,dataOUT : Pointer;SizeX,SizeY :
Integer);var  x,y:GLint;  temp1,temp2,temp3: GLbyte;beginfor y := 0 to
(SizeY*SizeX)-2 do   begin      With TWrap(DataIN^)[SizeY*SizeX-y*4]
do     begin       TWrap(DataOUT^)[y].R:=R+y*SizeX*4;     
 TWrap(DataOUT^)[y].G:=G+y*SizeX*4;     
 TWrap(DataOUT^)[y].B:=B+y*SizeX*4;     end;   end; end;  //........sw
s_scale(img_convert_context,@frame^.data,@frame^.linesize,0,codec_cont
ext^.height,@pFrameYUV420P^.data,@pFrameYUV420P^.linesize); SwapTB(pFr
ameYUV420P^.data[0],pData,codec_context^.width,codec_context^.height);
 //.......gluBuild2DMipmaps(GL_TEXTURE_2D, 3, Width, Height, GL_RGB,
GL_UNSIGNED_BYTE, pData);//.......   please tell me the normal way to
draw frames from ffmpeg (avcodec) to opengl texture
the rendering result is also attached
rendermustbe - original frame
renderresult -  direct rendering of data from a decoder
renderresultnew -  rendering by copying pixels