RGB24转YUV420P

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void CVideoEncoder::RGB24ToYUV420(int Width,int Height,uint8_t* RgbBuffer,uint8_t*YuvBuffer){ uint8_t* yuvBuf=YuvBuffer;//YUV空间int nWidth=Width;int nHeight=Height;/////////////////////下面转换算法是网上查到的int i, j; uint8_t*bufY = yuvBuf; uint8_t*bufU = yuvBuf + nWidth * nHeight; uint8_t*bufV = bufU + (nWidth* nHeight* 1/4); uint8_t*Y=bufY;uint8_t*U=bufU;uint8_t*V=bufV;uint8_t*bufRGB;unsigned char y, u, v, r, g, b,testu,testv;if (NULL==pRGBBuffer){   return ;}for (j = 0; j<nHeight;j++){bufRGB = RgbBuffer + nWidth * (nHeight - 1-j) * 3 ; for (i = 0;i<nWidth;i++){int pos = nWidth * i + j;r= *(bufRGB++);g = *(bufRGB++);b = *(bufRGB++);y =(unsigned char)(( 66 * r + 129 * g +  25 * b + 128) >>8) + 16;//16v = (unsigned char)((-38 * r -  74 * g + 112 * b + 128) >>8) +128  ; //128          u = (unsigned char)((112 * r -  94 * g -  18 * b + 128) >> 8) + 128 ;*(bufY++)=max(0,min(y, 255 ));if (j%2==0&&i%2 ==0){if (u>255){u=255;}if (u<0){u = 0;}*(bufU++) =u;//存u分量}else{//存v分量if (i%2==0){if (v>255){v = 255;}if (v<0){v = 0;}*(bufV++) =v;}}}}}

//YUV对应到datapVideoEncoder->m_pYUVFrame->data[0]=pVideoEncoder->yuv_buff;pVideoEncoder->m_pYUVFrame->data[1]=pVideoEncoder->yuv_buff+y_size;pVideoEncoder->m_pYUVFrame->data[2]=pVideoEncoder->yuv_buff+(y_size*5)/4;

//第二种方法 用FFMPEGuint8_t *rgb_src[3]= {rgb, NULL, NULL};int rgb_stride[3]={3*biWidth, 0, 0};AVFrame picture;avpicture_alloc((AVPicture*)(&picture), AV_PIX_FMT_YUV420P,biWidth,biHeight);SwsContext *yuvContext=sws_getContext(biWidth,biHeight,AV_PIX_FMT_BGR24,biWidth,biHeight,AV_PIX_FMT_YUV420P,SWS_BICUBIC, NULL, NULL, NULL);sws_scale(yuvContext,rgb_src, rgb_stride, 0, biHeight, picture.data, picture.linesize);

//注意如果转换后出现倒立，请安下面方式更正

picture.data[0] += picture.linesize[0] * (biHeight - 1);picture.linesize[0] *= -1;                      picture.data[1] += picture.linesize[1] * (biHeight / 2 - 1);picture.linesize[1] *= -1;picture.data[2] += picture.linesize[2] * (biHeight/ 2 - 1);picture.linesize[2] *= -1;

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