can OpenGL convert YUV422P to RGB565,thanks
On 12月5日, 下午12时42分, Dave Sparks <[EMAIL PROTECTED]> wrote:
> The reference software implementation of SurfaceFlinger doesn't
> support YUV color conversion. It uses the Y plane for monochrome so
> that something is displayed.
>
> On Dec 4, 3:22 am, Shirish <[EMAIL PROTECTED]> wrote:
>
>
>
> > Hi,
>
> > I want to use the YUV format and its a different format. In that case
> > do I need to only change the Surface Flinger to use the Open GL
> > extension for YUV format. Is there some other module which needs to
> > change?
> > Does currently Android 1.0 Release has Open GL extensions for the YUV
> > format?
>
> > Thanks,
> > -Shirish
>
> > On Dec 4, 2:44 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
>
> > > yuv422 to rgb565 doesn't work well
>
> > > uint32_t mCoefTbl32[516];
> > > uint8_t *mCoefTbl = NULL;
> > > static void init_coff()
> > > {
> > > uint8_t *clip;
> > > int i;
> > > mCoefTbl = (uint8_t *)mCoefTbl32;
> > > *((uint32_t*)mCoefTbl) = (int)(65536*0.4681); //0.714);
> > > *((uint32_t*)(mCoefTbl+4)) = (int)(65536*1.5748);//1.402);
> > > *((uint32_t*)(mCoefTbl+8)) = (int)(65536*0.1873);//0.344);
> > > *((uint32_t*)(mCoefTbl+12)) = (int)(65536*1.8556);//1.772);
>
> > > clip = mCoefTbl + 400;
> > > /* do 5 bit conversion */
> > > memset( &clip[-384], 0, 385*sizeof( *clip));
> > > memset( &clip[ 640], 0, 385*sizeof( *clip));
>
> > > for (i=1; i<255; i++){ // range of (x>>3) between -24 and 56
> > > clip[i] = i>>3;
> > > clip[i+1024] = i>>2;
> > > }
> > > memset( &clip[255], 31, 385*sizeof( *clip));
> > > memset( &clip[1279], 63, 385*sizeof( *clip));
>
> > > }
>
> > > static int32_t cc16(uint16_t *pY,uint8_t *pCb, uint8_t *pCr, uint8_t
> > > *dst, int32_t *disp, uint8_t *coff_tbl)
> > > {
> > > #define OFFSET_5_0 2
> > > #define OFFSET_6_0 (1+1024)
> > > #define OFFSET_5_1 6
> > > #define OFFSET_6_1 (3+1024)
>
> > > uint16_t *pDst;
> > > int32_t src_pitch, dst_pitch, src_width;
> > > int32_t Y, Cb, Cr, Cg;
> > > int32_t deltaY, deltaDst, deltaCbCr;
> > > int32_t row, col;
> > > int32_t tmp0, tmp1, tmp2;
> > > uint32_t rgb;
> > > uint8_t *clip = coff_tbl+400;
> > > int32_t cc1 = (*((int32_t*)(clip - 400)));
> > > int32_t cc3 = (*((int32_t*)(clip - 396)));
> > > int32_t cc2 = (*((int32_t*)(clip - 392)));
> > > int32_t cc4 = (*((int32_t*)(clip - 388)));
>
> > > src_pitch = disp[0];
> > > dst_pitch = disp[1];
> > > src_width = disp[2];
>
> > > if(disp[6]) /* rotate 180 and flip */
> > > { /* move the starting point to the bottom-left corner of the
> > > picture */
> > > deltaY = src_pitch*(disp[3]-1);
> > > deltaY = (src_pitch>>1)*((disp[3]>>1)-1);
> > > deltaY = -src_width-(src_pitch<<1);
> > > deltaCbCr = -((src_width+src_pitch)>>1);
> > > src_pitch = -(src_pitch>>1);
> > > }
> > > else
> > > {
> > > deltaY = (src_pitch<<1)-src_width;
> > > deltaCbCr = (src_pitch-src_width)>>1;
> > > src_pitch >>= 1;
> > > }
>
> > > deltaDst = (dst_pitch<<1)-src_width;
> > > pDst = (uint16_t *)dst;
>
> > > for(row = disp[3]; row >0; row-=2){
>
> > > for(col = src_width-1; col >=0; col-=2){
>
> > > Cb = *pCb++; Cr = *pCr++;
> > > Y = pY[src_pitch];
>
> > > Cb -= 128; Cr -= 128;
> > > Cg = Cr*cc1;
> > > Cr *= cc3;
>
> > > Cg += Cb*cc2;
> > > Cb *= cc4;
>
> > > tmp0 = (Y & 0xFF); //Low endian left pixel
> > > tmp0 += OFFSET_5_0;
>
> > > tmp1 = tmp0 - (Cg>>16);
> > > tmp2 = tmp0 + (Cb>>16);
> > > tmp0 = tmp0 + (Cr>>16);
>
> > > tmp0 = clip[tmp0];
> > > tmp1 = clip[tmp1 + OFFSET_6_0 - OFFSET_5_0];
> > > tmp2 = clip[tmp2];
> > > //RGB_565
>
> > > rgb = tmp1|(tmp0<<6);
> > > rgb = tmp2|(rgb<<5);
>
> > > Y = (Y>>8) & 0xFF;
>
> > > Y += OFFSET_5_1;
> > > tmp1 = (Y) - (Cg>>16);
> > > tmp2 = (Y) + (Cb>>16);
> > > tmp0 = (Y) + (Cr>>16);
>
> > > tmp0 = clip[tmp0];
> > > tmp1 = clip[tmp1 + OFFSET_6_1 - OFFSET_5_1];
> > > tmp2 = clip[tmp2];
>
> > > //RGB_565
>
> > > tmp0 = tmp1|(tmp0<<6);
> > > tmp0 = tmp2|(tmp0<<5);
>
> > > rgb |= (tmp0<<16);
>
> > > *( (uint32_t*)(pDst+dst_pitch) ) = rgb;
>
> > > //load the top two pixels
> > > Y = *pY++;
>
> > > tmp0 = (Y & 0xFF); //Low endian left pixel
> > > tmp0 += OFFSET_5_1;
>
> > > tmp1 = tmp0 - (Cg>>16);
> > > tmp2 = tmp0 + (Cb>>16);
> > > tmp0 = tmp0 + (Cr>>16);
>
> > > tmp0 = clip[tmp0];
> > > tmp1 = clip[tmp1 + OFFSET_6_1 - OFFSET_5_1];
> > > tmp2 = clip[tmp2];
> > > //RGB_565
>
> > > rgb = tmp1|(tmp0<<6);
> > > rgb = tmp2|(rgb<<5);
>
> > > Y = (Y>>8) & 0xFF;
>
> > > Y += OFFSET_5_0;
> > > tmp1 = (Y) - (Cg>>16);
> > > tmp2 = (Y) + (Cb>>16);
> > > tmp0 = (Y) + (Cr>>16);
>
> > > tmp0 = clip[tmp0];
> > > tmp1 = clip[tmp1 + OFFSET_6_0 - OFFSET_5_0];
> > > tmp2 = clip[tmp2];
>
> > > //RGB_565
>
> > > tmp0 = tmp1|(tmp0<<6);
> > > tmp0 = tmp2|(tmp0<<5);
>
> > > rgb |= (tmp0<<16);
> > > *( (uint32_t *)pDst) = rgb; pDst+=2;
>
> > > }//end of COL
>
> > > pY += (deltaY>>1);
> > > pCb += deltaCbCr;
> > > pCr += deltaCbCr;
> > > pDst+= (deltaDst); //coz pDst defined as UINT *
> > > }
> > > return 1;
>
> > > }
>
> > > On 11月19日, 下午5时02分, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
>
> > > > thanks very much,cpu is pxa300,camera only provides yuv422 & RawRGB,
>
> > > > "On the G1 we use another code path to draw video frames" which
> > > > path,thanks~
>
> > > > On 11月19日, 下午4时07分, Mathias Agopian <[EMAIL PROTECTED]> wrote:
>
> > > > > Hi,
>
> > > > > On Tue, Nov 18, 2008 at 11:15 PM, [EMAIL PROTECTED]
>
> > > > > <[EMAIL PROTECTED]> wrote:
>
> > > > > > the camera provide yuv422 data,butopenGL"just show the Y plane of
> > > > > >YUVbuffers"(frameworks\base\libs\surfaceflinger\LayerBase.cpp
> > > > > > 624),must convert yuv422 to rgb565,camera preview is ok,a little
> > > > > > slow,why,thanks
>
> > > > > No,OpenGLdoesn't supportYUVtextures. That's just that.
>
> > > > > On the G1 we use another code path to draw video frames, it doesn't
> > > > > useOpenGLES, instead it uses the 2D engine. The code that you are
> > > > > referring to exists only so that theYUVvideo node will display
> > > > > "something" when used on the emulator or on a device that doesn't do
> > > > >YUV(in which case the video node should not try to produceYUV
> > > > > output). It's mostly there for debugging.
>
> > > > > Of course, *some*YUVextensions forOpenGLES exist, and the code
> > > > > in SurfaceFlinger doesn't make use of them at this time. Exercise left
> > > > > to the reader... or until real h/w with these capabilities falls into
> > > > > my hands.
>
> > > > > What h/w are you using?
>
> > > > > Mathias- 隐藏被引用文字 -
>
> > > > - 显示引用的文字 -- Hide quoted text -
>
> > > - Show quoted text -- 隐藏被引用文字 -
>
> - 显示引用的文字 -
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