SDL+FFMPEG視頻流程

1.定義結構體SDL_Overlay *bmp;  SDL_Surface *screen;  SDL_Rect rect;  SDL_Event event;  2.初始化SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER);3.建立screen ,設定顯示模式screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 0, 0);4.建立YUV顯示映像SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,          SDL_YV12_OVERLAY, screen);  5.鎖定映像SDL_LockYUVOverlay(bmp); 6.更新映像 AVPicture pict;                  pict.data[0] = bmp->pixels[0];                  pict.data[1] = bmp->pixels[2];                  pict.data[2] = bmp->pixels[1];                    pict.linesize[0] = bmp->pitches[0];                  pict.linesize[1] = bmp->pitches[2];                  pict.linesize[2] = bmp->pitches[1];  7.解鎖圖層SDL_UnlockYUVOverlay(bmp);8.重新整理映像SDL_DisplayYUVOverlay(bmp, &rect); 9.延遲SDL_Delay(40);