sdl 播放yuv

LRESULT CVideoPlayerPropPage::OnInitSDL(WPARAM wParam,LPARAM lParam)

{

#ifdef _SDL_H

// 初始化 需要很多时间  会影响ocx 界面的显示

if( SDL_Init(SDL_INIT_EVERYTHING) == -1)

{

TTRACE("%s SDL_Init is failed \r\n", __FUNCTION__);

}

//用mfc窗口句柄创建一个sdl window

    m_pSDLWindow = SDL_CreateWindowFrom( (void *)(m_ImgWnd->m_hWnd) );

#endif

return TRUE;

}

void CVideoPlayerPropPage::PlayMediaYuvData( ST_YUV_VIDEO_DATA &stYuvData )

{

STRY;

#ifdef _SDL_H

m_nWidth = stYuvData.nWidth;

m_nHeight = stYuvData.nHeight;

//SDL  Show YUV data

if(m_nMagnification == 0) //正常播放  没有缩放

{

m_sdlSrcRect.h = stYuvData.nHeight;

m_sdlSrcRect.w = stYuvData.nWidth;

m_sdlSrcRect.x = 0;

m_sdlSrcRect.y = 0;

}

SDL_Rect srcRT;

    srcRT.h = stYuvData.nHeight;

    srcRT.w = stYuvData.nWidth;

    srcRT.x = 0;

    srcRT.y = 0;

    SDL_Rect dstRT;

    dstRT.h = stYuvData.nHeight;

    dstRT.w = stYuvData.nWidth;

    dstRT.x = 0;

    dstRT.y = 0;

    int iW = stYuvData.nWidth;

    int iH = stYuvData.nHeight;    

    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( m_pSDLWindow, &iWidth, &iHeight );

    dstRT.h = iHeight;

    dstRT.w = iWidth;   

    if(m_pSDLRender == NULL)

{

int nDriversCount = SDL_GetNumRenderDrivers();

//创建渲染器，第二个参数为选用的画图驱动，0代表d3d

m_pSDLRender = SDL_CreateRenderer( m_pSDLWindow, 0, SDL_RENDERER_ACCELERATED );

if(m_pSDLRender == NULL)

{

TTRACE("%s SDL_GetError() =%s ",__FUNCTION__,SDL_GetError());

}

SDL_RendererInfo info;

SDL_GetRendererInfo(m_pSDLRender, &info);

}

    //创建纹理

if(m_pSDLTexture == NULL)

{

m_pSDLTexture = SDL_CreateTexture( m_pSDLRender,SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, iW, iH ); 

}

int nRet = FALSE;

nRet = SDL_UpdateYUVTexture(m_pSDLTexture,&srcRT,stYuvData.pData[0],stYuvData.nLineSize[0],\

stYuvData.pData[1],stYuvData.nLineSize[1],stYuvData.pData[2],stYuvData.nLineSize[2]);

//nRet = SDL_UpdateTexture( m_pSDLTexture, &srcRT, stYuvData.pYuvbuf, iPitch );

nRet = SDL_RenderClear( m_pSDLRender );

//if( !m_bIsSpecilReToShow )//不是指定区域显示

{

if(m_bIsZoom)

{

m_bIsZoom = FALSE;

if(m_nMagnification > m_nOldMagnification)

{

if(m_nMagnification < stYuvData.nWidth)

{

m_sdlSrcRect.x += m_nMagnification;

}

if(m_nMagnification < stYuvData.nHeight )

{

m_sdlSrcRect.y += m_nMagnification;

}

if( (m_nMagnification*2 + m_sdlSrcRect.x ) < m_sdlSrcRect.w )

{

m_sdlSrcRect.w -= m_nMagnification;

m_sdlSrcRect.w -= m_nMagnification;

}

if( (m_nMagnification*2 + m_sdlSrcRect.y ) < m_sdlSrcRect.h )

{

m_sdlSrcRect.h -= m_nMagnification;

m_sdlSrcRect.h -= m_nMagnification;

}

//SetBrightness(stYuvData.pYuvbuf,m_nWidth,m_nHeight,g_nBrightness);

}

else

{

if(m_nMagnification < stYuvData.nWidth)

{

m_sdlSrcRect.x -= m_nMagnification;

}

if(m_nMagnification < stYuvData.nHeight )

{

m_sdlSrcRect.y -= m_nMagnification;

}

// if( (m_nMagnification + m_sdlSrcRect.x + 100) < m_sdlSrcRect.w )

{

m_sdlSrcRect.w += m_nMagnification;

m_sdlSrcRect.w += m_nMagnification;

}

// if( (m_nMagnification + m_sdlSrcRect.y + 100) < m_sdlSrcRect.h )

{

m_sdlSrcRect.h += m_nMagnification;

m_sdlSrcRect.h += m_nMagnification;

}

}

m_nOldMagnification = m_nMagnification;

/*

// if( (m_nMagnification + m_sdlSrcRect.x + 100) < m_sdlSrcRect.w )

{

srcRT.w -= m_nMagnification;

srcRT.w -= m_nMagnification;

m_sdlSrcRect.w =  srcRT.w;

}

// if( (m_nMagnification + m_sdlSrcRect.y + 100) < m_sdlSrcRect.h )

{

srcRT.h -= m_nMagnification;

srcRT.h -= m_nMagnification;

m_sdlSrcRect.h = srcRT.h;

}

*/

m_rectCurZoom.left = m_sdlSrcRect.x;

m_rectCurZoom.top = m_sdlSrcRect.y;

m_rectCurZoom.right = m_rectCurZoom.left + m_sdlSrcRect.w;

m_rectCurZoom.bottom = m_rectCurZoom.top + m_sdlSrcRect.h;

}

}

//else //指定区域显示

{

/*

   m_sdlSrcRect.x = m_rectCurZoom.left;

m_sdlSrcRect.y = m_rectCurZoom.right;

m_sdlSrcRect.w = m_rectCurZoom.Width();

m_sdlSrcRect.h = m_rectCurZoom.Height();

*/

}

SDL_RenderCopy( m_pSDLRender, m_pSDLTexture, &m_sdlSrcRect, &dstRT );

// SDL_RenderCopy( m_pSDLRender, m_pSDLTexture, &sdlRT, &dstRT );

SDL_RenderPresent( m_pSDLRender );

#endif

return;

SCATCH;

return;

}