On 4/10/19, Boris <ndjorebo...@gmail.com> wrote: > Le mar. 9 avr. 2019 à 17:44, Simon Brown <simon.k.br...@gmail.com> a écrit > : > >> >>> Thanks, >>> If I understand what you said, I have to proccess like this : >>> >>> //Declaration of yuv arrays >>> uint16_t yval[mb_height * mb_width][256]; >>> uint16_t uval[mb_height * mb_width][256]; >>> uint16_t vval[mb_height * mb_width][256]; >>> >>> for(int mby=0; mby<mb_height; mby++) >>> { >>> for(int mbx=0; mbx <mb_width ;mbx++) >>> { >>> //Now for this 16x16 macroblock >>> for(int y=0; y<16;y++) >>> { >>> for(int x=0; x<16;x++) >>> { >>> yval[mby*mb_width + mbx][y*16+x] = >>> data[0][linesize[0]*y*16+x]; or yval[mby*mb_width + mbx][y*16+x] = >>> data[0][y*16+x]??? >>> uval[mby*mb_width + mbx][(y/2)*16+x/2] = >>> data[1][linesize[1]*(y/2)*16+x/2]; >>> uval[mby*mb_width + mbx][(y/2)*16+x/2] = >>> data[2][linesize[2]*(y/2)*16+x/2]; >>> //Setting of Yuv arrays >>> >>> } >>> } >>> //Let's go to an other macroblock >>> } >>> } >>> >>> Regards >>> >>>> >>>> Not quite - the data in data[0] is arranged by pixels, so your >> coordinate into that array must include all the pixels, not just the >> current macroblock. So you need: >> yval[mby*mb_width + mbx][y*16+x] = data[0][ linesize[0]*(mby*16 + y) + >> (mbx*16 + x) ] >> so you skip all lines up to the one you're processing, including all >> previous macroblocks and all lines already processed in the current >> macroblock using "linesize[0]*(mby*16 + y)" and then all the pixels in >> the >> current line up to the macroblock you're interested in, and any pixels >> already processed in that macroblock with "mbx*16 + x". >> >> I hope that makes sense. >> >> Regards, >> Simon >> > > Hello Simon, > > I do like you tell me but data[0][ linesize[0]*(mby*16 + y) + (mbx*16 + x) > ] gives me some negatives pixel's values. > Is it normal ? > For exemple data[0][ linesize[0]*(mby*16 + y) + (mbx*16 + x) ] = > -62 > -65 > -72 > My question is to know if it is normal to have negatives pixel's value ( y > = -a; u=-b; v=-c) where a, b and c are integers.
Doesn't make sense, post full code. _______________________________________________ Libav-user mailing list Libav-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/libav-user To unsubscribe, visit link above, or email libav-user-requ...@ffmpeg.org with subject "unsubscribe".