SDL2.0在mfc窗口中显示yuv 数据

转载
http://airmanisvip.blog.163.com/blog/static/18058158201261015741216/

SDL2.0在mfc窗口中显示yuv的一种方法

2012-07-10 14:08:57| 分类： SDL|举报|字号 订阅





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DWORD ThreadFun()

{

//用mfc窗口句柄创建一个sdl window

SDL_Window * pWindow = SDL_CreateWindowFrom( (void *)( GetDlgItem(IDC_STATIC1)->GetSafeHwnd() ) );

SDL_Rect sdlRT;

sdlRT.h = 288;

sdlRT.w = 352;

sdlRT.x = 0;

sdlRT.y = 0;

SDL_Rect dstRT;

dstRT.h = 288;

dstRT.w = 352;

dstRT.x = 0;

dstRT.y = 0;

int iW = 352;

int iH = 288;

char szData[352*288*2] = {0};

char szPrint[256] = {0};

//计算yuv一行数据占的字节数

int iPitch = iW*SDL_BYTESPERPIXEL(SDL_PIXELFORMAT_YV12);

int iWidth = 0;

int iHeight = 0;

SDL_GetWindowSize( pWindow, &iWidth, &iHeight );

dstRT.h = iHeight;

dstRT.w = iWidth;

//获取当前可用画图驱动 window中有3个，第一个为d3d，第二个为opengl，第三个为software

int iii = SDL_GetNumRenderDrivers();

//创建渲染器，第二个参数为选用的画图驱动，0代表d3d

SDL_Renderer * pRender = SDL_CreateRenderer( pWindow, 0, SDL_RENDERER_ACCELERATED );

sprintf( szPrint, "%s", SDL_GetError());

SDL_RendererInfo info;

SDL_GetRendererInfo(pRender, &info);

SDL_GetRenderDriverInfo(0, &info); //d3d

SDL_GetRenderDriverInfo(1, &info); //opgl

SDL_GetRenderDriverInfo(2, &info); //software

char szInfo[256] = {0};

sprintf(szInfo, "%s", info.name);

sprintf( szPrint, "%s", SDL_GetError());

//创建纹理

SDL_Texture * pTexture = SDL_CreateTexture( pRender,SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, iW, iH );

FILE * pFile = fopen( "d:\\cap1.yuv", "rb" );

if ( pFile == NULL )

{

int u = 0;

}

//读yuv文件，该文件中存放的数据尺寸为 352*288的yv12数据

while ( fread( szData, 1, iW*iH*3/2, pFile ) != NULL )

{

int i = SDL_UpdateTexture( pTexture, &sdlRT, szData, iPitch );

SDL_RenderClear( pRender );

SDL_RenderCopy( pRender, pTexture, &sdlRT, &dstRT );

SDL_RenderPresent( pRender );

Sleep(40);

}

fclose(pFile);

if ( pTexture != NULL )

{

SDL_DestroyTexture( pTexture );

pTexture = NULL ;

}

if ( pRender != NULL )

{

SDL_DestroyRenderer( pRender );

pRender = NULL;

}

if ( NULL != pWindow )

{

SDL_DestroyWindow( pWindow );

pWindow = NULL;

}

}

注意在SDL_CreateWindowFrom中sdl将窗口的消息处理函数地址给改写成sdl的函数了（在sdl源文件中SetupWindowData（）此函数内修改），



同时在SDL_Destroy函数中会恢复hwnd默认消息处理函数，如果不希望sdl参与消息处理，可将SetWindowLongPtr注销掉

对SDL的使用还在摸索中，不能保证上述知识全部正确，如哪位仁兄发现问题，请留言更正，再次谢过了！