SDL視窗拉伸時顯示YUV

2021-09-27 06:39:08 字數 3287 閱讀 9203

（本部落格旨在個人總結回顧）

本例子是在雷神的sdl例子基礎上改的，發現雷神的例子上實現yuv資料顯示時進行視窗拉伸，發現顯示異常。

效果：

關鍵原始碼：

// testsdl.cpp : 定義控制台應用程式的入口點。


//#include "stdafx.h"


#ifdef __cplusplus


extern "c"


;#endif


#pragma comment(lib, "sdl2.lib")


#pragma comment(lib, "sdl2main.lib")


//refresh event


#define refresh_event (sdl_userevent + 1)


//break


#define break_event (sdl_userevent + 2)


int g_ntheadexit = 0;


bool g_bresize = false;


sdl_mutex* g_psdlmutex = sdl_createmutex();


sdl_window* g_pscreen = null;


struct threaddata


;int refreshvideo(void* popaque)


while (0 == g_ntheadexit)


if (fread(buffer, 1, npixelwidth*npixelheight*nbpp / 8, pfile) != npixelwidth*npixelheight*nbpp / 8)


sdl_getwindowsize(psdlthreaddate->psdlwindow, &nscreenwidth, &nscreenheight);


//sdl_setwindowsize(psdlthreaddate->psdlwindow, nscreenwidth, nscreenheight);


//設定紋理資料


int ret = sdl_updatetexture(psdlthreaddate->psdltexture, null, buffer, npixelwidth);


ret = sdl_renderclear(psdlthreaddate->psdlrenderer);


sdl_rect sdlrect;


sdlrect.x = 0;


sdlrect.y = 0;


sdlrect.w = 640;


sdlrect.h = 360;


cout << nscreenwidth << "x" << nscreenheight << endl;


//將紋理拷貝給渲染器


ret = sdl_rendercopy(psdlthreaddate->psdlrenderer, psdlthreaddate->psdltexture, null, &sdlrect);


//cout << __line__ << endl;


//顯示


sdl_renderpresent(psdlthreaddate->psdlrenderer);


sdl_unlockmutex(psdlthreaddate->psdlmutex);


cout << "refresh video!" << endl;


sdl_event sdlevent;


sdlevent.type = refresh_event;


sdl_pushevent(&sdlevent);


}g_ntheadexit = 0;


sdl_event tmpsdlevent;


tmpsdlevent.type = break_event;


sdl_pushevent(&tmpsdlevent);


return 0;


}int mysdleventfilter(void *userdata, sdl_event * event)


}return 1;


}int _tmain(int argc, _tchar* ar**)


sdl_seteventfilter(mysdleventfilter, null);


//建立視窗


g_pscreen = sdl_createwindow("******st video play sdl2", sdl_windowpos_undefined, sdl_windowpos_undefined,


nscreenwidth, nscreenheight, sdl_window_resizable);


if (!g_pscreen)


//建立渲染器


sdl_renderer* psdlrenderer = sdl_createrenderer(g_pscreen, -1, 0);


uint32 unpixformat = 0;


//iyuv: y + u + v (3 planes)


//yv12: y + v + u (3 planes)


unpixformat = sdl_pixelformat_iyuv;


//建立紋理


sdl_texture* psdltexture = sdl_createtexture(psdlrenderer, unpixformat, sdl_textureaccess_streaming, npixelwidth, npixelheight);


threaddata threaddate;


threaddate.psdlwindow = g_pscreen;


threaddate.psdltexture = psdltexture;


threaddate.psdlrenderer = psdlrenderer;


threaddate.psdlmutex = g_psdlmutex;


sdl_thread* prefreshthread = sdl_createthread(refreshvideo, null, &threaddate);


sdl_event sdlevent;


while (true)


}sdl_destroywindow(g_pscreen);


sdl_destroyrenderer(psdlrenderer);


sdl_destroytexture(psdltexture);


sdl_destroymutex(g_psdlmutex);


sdl_quit();


return 0;


}

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