转：使用FFMpeg进行H264编码 .

CFile file[5];
 BYTE *szTxt[5];
 
 int nWidth = 0;
 int nHeight= 0;
 
 int nDataLen=0;
 
 int nLen;
 
 CString csFileName;
 for (int fileI = 1; fileI <= 5; fileI ++)
 {
   csFileName.Format("e:\\pics\\%d.bmp", fileI);
   file[fileI - 1].Open(csFileName,CFile::modeRead | CFile::typeBinary);
   nLen = file[fileI - 1].GetLength();
 
   szTxt[fileI -1] = new BYTE[nLen];
   file[fileI - 1].Read(szTxt[fileI - 1], nLen);
   file[fileI - 1].Close();
 
   //BMP bmi;//BITMAPINFO bmi;
   //int nHeadLen = sizeof(BMP);
   BITMAPFILEHEADER bmpFHeader;
   BITMAPINFOHEADER bmpIHeader;
   memcpy(&bmpFHeader,szTxt[fileI -1],sizeof(BITMAPFILEHEADER));
 
   int nHeadLen = bmpFHeader.bfOffBits - sizeof(BITMAPFILEHEADER);
   memcpy(&bmpIHeader,szTxt[fileI - 1]+sizeof(BITMAPFILEHEADER),nHeadLen);
 
 nWidth = bmpIHeader.biWidth;// 464;// bmi.bmpInfo.bmiHeader.biWidth;// ;
   nHeight = bmpIHeader.biHeight;//362;// bmi.bmpInfo.bmiHeader.biHeight;// ;
 
   szTxt[fileI - 1] += bmpFHeader.bfOffBits;
   nDataLen = nLen-bmpFHeader.bfOffBits;
 }
 
 av_register_all();
 avcodec_register_all();
 AVFrame *m_pRGBFrame =  new AVFrame[1];  //RGB帧数据  
 AVFrame *m_pYUVFrame = new AVFrame[1];;  //YUV帧数据
 AVCodecContext *c= NULL;
 AVCodecContext *in_c= NULL;
 AVCodec *pCodecH264; //编码器
 uint8_t * yuv_buff;//
 
 //查找h264编码器
 pCodecH264 = avcodec_find_encoder(CODEC_ID_H264);
 if(!pCodecH264)
 {
   fprintf(stderr, "h264 codec not found\n");
   exit(1);
 }
 
 c= avcodec_alloc_context3(pCodecH264);
 c->bit_rate = 3000000;// put sample parameters
 c->width =nWidth;//
 c->height = nHeight;//
 
 // frames per second
 AVRational rate;
 rate.num = 1;
 rate.den = 25;
 c->time_base= rate;//(AVRational){1,25};
 c->gop_size = 10; // emit one intra frame every ten frames
 c->max_b_frames=1;
 c->thread_count = 1;
 c->pix_fmt = PIX_FMT_YUV420P;//PIX_FMT_RGB24;
 
 //av_opt_set(c->priv_data, /*"preset"*/"libvpx-1080p.ffpreset", /*"slow"*/NULL, 0);
 //打开编码器
 if(avcodec_open2(c,pCodecH264,NULL)<0)
   TRACE("不能打开编码库");
 
 int size = c->width * c->height;
 
 yuv_buff = (uint8_t *) malloc((size * 3) / 2); // size for YUV 420
 
 //将rgb图像数据填充rgb帧
 uint8_t * rgb_buff = new uint8_t[nDataLen];
 
 //图象编码
 int outbuf_size=100000;
 uint8_t * outbuf= (uint8_t*)malloc(outbuf_size);
 int u_size = 0;
 FILE *f=NULL;
 char * filename = "e:\\pics\\myData.h264";
 f = fopen(filename, "wb");
 if (!f)
 {
   TRACE( "could not open %s\n", filename);
   exit(1);
 }
 
 //初始化SwsContext
 SwsContext * scxt = sws_getContext(c->width,c->height,PIX_FMT_BGR24,c->width,c->height,PIX_FMT_YUV420P,SWS_POINT,NULL,NULL,NULL);
 
 AVPacket avpkt;
 
 //AVFrame *pTFrame=new AVFrame
 for (int i=0;i<250;++i)
 {
 
   //AVFrame *m_pYUVFrame = new AVFrame[1];
   
   int index = (i / 25) % 5;
   memcpy(rgb_buff,szTxt[index],nDataLen);
 
   avpicture_fill((AVPicture*)m_pRGBFrame, (uint8_t*)rgb_buff, PIX_FMT_RGB24, nWidth, nHeight);
   
   //将YUV buffer 填充YUV Frame
   avpicture_fill((AVPicture*)m_pYUVFrame, (uint8_t*)yuv_buff, PIX_FMT_YUV420P, nWidth, nHeight);
 
   // 翻转RGB图像
   m_pRGBFrame->data[0]  += m_pRGBFrame->linesize[0] * (nHeight - 1);
   m_pRGBFrame->linesize[0] *= -1;                   
   m_pRGBFrame->data[1]  += m_pRGBFrame->linesize[1] * (nHeight / 2 - 1);
   m_pRGBFrame->linesize[1] *= -1;
   m_pRGBFrame->data[2]  += m_pRGBFrame->linesize[2] * (nHeight / 2 - 1);
   m_pRGBFrame->linesize[2] *= -1;
 
 
   //将RGB转化为YUV
   sws_scale(scxt,m_pRGBFrame->data,m_pRGBFrame->linesize,0,c->height,m_pYUVFrame->data,m_pYUVFrame->linesize);
   
   int got_packet_ptr = 0;
   av_init_packet(&avpkt);
   avpkt.data = outbuf;
   avpkt.size = outbuf_size;
   u_size = avcodec_encode_video2(c, &avpkt, m_pYUVFrame, &got_packet_ptr);
   if (u_size == 0)
   {
    fwrite(avpkt.data, 1, avpkt.size, f);
   }
 }
 
 fclose(f);
 delete []m_pRGBFrame;
 delete []m_pYUVFrame;
 delete []rgb_buff;
 free(outbuf);
 avcodec_close(c);
 av_free(c);