Qt加SDL示例开发指南
渲染BMP
#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
int main(int argc, char *argv[])
{
SDL_Surface *screen;
SDL_Surface *loadbmp;
SDL_Event event;
SDL_Rect* SRCrect=0;
SDL_Rect* DSTrect=0;
int isRun=1;
SDL_Init(SDL_INIT_VIDEO);
screen=SDL_SetVideoMode(400, 400, 32, SDL_SWSURFACE);
loadbmp=SDL_LoadBMP("sample.bmp");
SDL_BlitSurface(loadbmp,SRCrect,screen,DSTrect);
SDL_Flip(screen);
while(isRun)
{
SDL_WaitEvent(&event);
switch (event.type)
{
case SDL_QUIT:
isRun=0;
break;
}
}
SDL_FreeSurface(screen);
SDL_FreeSurface(loadbmp);
return(0);
}
渲染YUV
#include <iostream>
#include <fstream>
#include "SDL.h"
#include <windows.h>
#pragma comment(lib, "SDL.lib")
#pragma comment(lib, "SDLmain.lib")
using namespace std;
void useage();
bool flip( unsigned char * src, int width, int height);
SDL_Surface *pscreen;
SDL_Overlay *poverlay;
int main(int argc, char **argv)
{
if(argc != 4)
{
useage();
return 1;
}
int readsize;
int width = 0, height = 0;
width = atoi(argv[2]);
height = atoi(argv[3]);
readsize = width * height *3 /2;
unsigned char *yuvframe = new unsigned char[readsize];
cout << "2010.12.12 显示 yuv 420的程序" << endl;
cout << "open "<< argv[1] <<": "<< width <<" x " << height << endl;
cout << "readsize: " << readsize << endl;
atexit(SDL_Quit);
//初始化SDL子系统
if(SDL_Init(SDL_INIT_VIDEO) < 0)
{
cout << "Unable to init SDL:" << SDL_GetError() << endl;
system("pause");
exit(1);
}
pscreen = SDL_SetVideoMode(width, height,24, SDL_SWSURFACE);
if(pscreen == NULL)
{
cout << "error at setvideomode" << endl;
}
poverlay = SDL_CreateYUVOverlay(width,height,SDL_YV12_OVERLAY,pscreen);
if(poverlay == NULL)
{
cout << "error at ppoverlay" << endl;
}
//打开文件
FILE *fyuv;
fyuv = fopen(argv[1],"rb");
if(fyuv == NULL)
{
cout << "can not open "<< argv[1] << endl;
return -1;
}
while(true)
{
//读取yuv数据
int rsize = fread(yuvframe,sizeof(char), readsize,fyuv);
if(rsize > 0)
{
static int num =0;
num ++;
flip(yuvframe, width, height);
char pnum[10];
sprintf(pnum,"#%d",num);
SDL_WM_SetCaption(pnum,NULL);
}
SDL_Delay(40);
//SDL事件处理
SDL_Event sdl_event;
while(SDL_PollEvent(&sdl_event))
{
switch(sdl_event.type)
{
case SDL_KEYDOWN:
break;
case SDL_KEYUP:
if(sdl_event.key.keysym.sym == SDLK_q)
{
return 0;
}
break;
case SDL_QUIT:
return 0;
default:
break;
}
}
}
return 0;
}
void useage()
{
cout << "play_yuv420 yuvfilename width height /n" << endl;
}
//显示（弹出flip）screen surface到屏幕上
bool flip( unsigned char * src, int width, int height)
{
unsigned char *outy,*outu,*outv,*out_buffer,*op[3];
SDL_Rect rect;
rect.w = width;
rect.h = height;
rect.x = 0;
rect.y = 0;
out_buffer = src;
SDL_LockSurface(pscreen);
SDL_LockYUVOverlay(poverlay);
outy = out_buffer;
outu = out_buffer+width*height*5/4;
outv = out_buffer+width*height;
for(int y=0;y<pscreen->h && y<poverlay->h;y++)
{
op[0]=poverlay->pixels[0]+poverlay->pitches[0]*y;
op[1]=poverlay->pixels[1]+poverlay->pitches[1]*(y/2);
op[2]=poverlay->pixels[2]+poverlay->pitches[2]*(y/2);
memcpy(op[0],outy+y*width,width);
if(y%2 == 0)
{
memcpy(op[1],outu+width/2*y/2,width/2);
memcpy(op[2],outv+width/2*y/2,width/2);
}
}
SDL_UnlockYUVOverlay(poverlay);
SDL_UnlockSurface(pscreen);
SDL_DisplayYUVOverlay(poverlay, &rect);
return 0;
}
/*-------------------------------------------------------- * * QThread Demo * * Copyright (C) 2010, dbzhang800 * modified by leoluopy 2014 * email: [email protected] * All rights reserved. * --------------------------------------------------------*/ #include <QtCore/QCoreApplication> #include <QtCore/QObject> #include <QtCore/QThread> #include <QtCore/QDebug> class Dummy:public QObject { Q_OBJECT public: Dummy(){} public slots: void emitsig() { emit sig(); } signals: void sig(); }; class Thread:public QThread { Q_OBJECT public: Thread(QObject* parent=0) :QThread(parent),m_slot_called_num(0) { //moveToThread(this); } public slots: void slot_main() { qDebug()<<"from thread slot_main:" <<currentThreadId(); printf("slots_called_num:%d\n",m_slot_called_num); m_slot_called_num++; } private: unsigned int m_slot_called_num ; protected: void run() { qDebug()<<"thread thread:"<<currentThreadId(); exec(); } }; #include "main.moc" //generate cmd: moc -o main.moc main.cpp int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); qDebug()<<"main thread:"<<QThread::currentThreadId(); Thread thread; Dummy dummy; QObject::connect(&dummy, SIGNAL(sig()), &thread, SLOT(slot_main())); thread.start(); dummy.emitsig(); dummy.emitsig(); dummy.emitsig(); return a.exec(); }
SDL展示封装类：
SDL_Displayer_c::SDL_Displayer_c()
{
}
SDL_Displayer_c::~SDL_Displayer_c()
{
}
void SDL_Displayer_c::InitEnv(int WindowWidth,int WindowHeight,int layer_width,int layer_height,long WinID)
{
// We could get a resize event at any time, so clean previous mode
SDL_QuitSubSystem(SDL_INIT_VIDEO);
/*set sdl env*/
char variable[64];
#ifdef Q_OS_WIN
sprintf(variable, "SDL_WINDOWID=0x%lx", frame_pre->winId());
#else
sprintf(variable, "SDL_WINDOWID=0x%lx", WinID);
#endif
putenv(variable);
printf("SDL env variable : %s\n",variable);
if ( SDL_InitSubSystem(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
return;
}
pscreen = SDL_SetVideoMode(WindowWidth, WindowHeight,24, SDL_SWSURFACE);
if ( ! pscreen ) {
fprintf(stderr, "Unable to set video mode: %s\n", SDL_GetError());
return;
}
printf("SDL Video Window Set OK !\n");
poverlay = SDL_CreateYUVOverlay(layer_width,layer_height,SDL_YV12_OVERLAY,pscreen);
if(poverlay == NULL){
printf("error at ppoverlay");
return ;
}
}
int SDL_Displayer_c::flip( unsigned char * src, int width, int height,int display_x,int display_y)
{
unsigned char *outy,*outu,*outv,*out_buffer,*op[3];int y=0 ;
SDL_Rect rect;
rect.w = width;
rect.h = height;
rect.x = display_x;
rect.y = display_y;
out_buffer = src;
SDL_LockSurface(pscreen);
SDL_LockYUVOverlay(poverlay);
outy = out_buffer;
outu = out_buffer+width*height*5/4;
outv = out_buffer+width*height;
for( y=0;y<pscreen->h && y<poverlay->h;y++)
{
op[0]=poverlay->pixels[0]+poverlay->pitches[0]*y;
op[1]=poverlay->pixels[1]+poverlay->pitches[1]*(y/2);
op[2]=poverlay->pixels[2]+poverlay->pitches[2]*(y/2);
memcpy(op[0],outy+y*width,width);
if(y%2 == 0)
{
memcpy(op[1],outu+width/2*y/2,width/2);
memcpy(op[2],outv+width/2*y/2,width/2);
}
}
SDL_UnlockYUVOverlay(poverlay);
SDL_UnlockSurface(pscreen);
SDL_DisplayYUVOverlay(poverlay, &rect);
return 0;
}
void SDL_Displayer_c::sdl_play(unsigned int width,unsigned int height,int display_x,int display_y,long WinID)
{
// int readsize;
// int width = 0, height = 0;
// width = 176;
// height =144;
// readsize = width * height *3 /2;
// unsigned char *yuvframe = (unsigned char*)malloc(readsize);
// //打开文件
// FILE *fyuv;
// fyuv = fopen("./resource/raw/BUS_176x144_15_avc_96.yuv","rb");
// if(fyuv == NULL)
// {
// fyuv = fopen("../resource/raw/BUS_176x144_15_avc_96.yuv","rb");
// if(fyuv == NULL){
// printf("can't load yuv file\n");
// exit(1);
// }
// }
// //读取yuv数据
// while(fread(yuvframe,sizeof(char), readsize,fyuv)){
// static int num =0;
// num ++;
// flip(yuvframe, width, height,display_x,display_y);
// char pnum[10];
// sprintf(pnum,"#%d",num);
// SDL_WM_SetCaption(pnum,NULL);
// SDL_Delay(40);
// }
static int num =0;
num ++;
flip(dummy.ImgBuf, width, height,display_x,display_y);
char pnum[10];
sprintf(pnum,"#%d",num);
SDL_WM_SetCaption(pnum,NULL);
}
头文件：
#include <SDL/SDL.h>
class SDL_Displayer_c
{
public:
SDL_Displayer_c();
void InitEnv(int WindowWidth,int WindowHeight,int layer_width,int layer_height,long WinID);
int flip( unsigned char * src, int width, int height,int display_x,int display_y);
void sdl_play(unsigned int width,unsigned int height,int display_x,int display_y,long WinID);
~SDL_Displayer_c();
private:
SDL_Surface *pscreen;
SDL_Overlay *poverlay;
protected:
};
Qmessage弹出的提示消息：
int ret = QMessageBox::warning(this, tr("Application"), tr("The document has been modified. ""Do you want to save your changes?"),
QMessageBox::Yes | QMessageBox::Default, QMessageBox::No, QMessageBox::Cancel | QMessageBox::Escape);
参考文章：
Qthread与QObject
http://blog.csdn.net/sydnash/article/details/7425947
yuv播放SDL：
http://blog.csdn.net/pafone/article/details/6072711
qt嵌入SDL：
http://mobile.51cto.com/symbian-271066.htm
qt关闭事件捕捉：
http://no001.blog.51cto.com/1142339/282807
Qt线程基础：
http://blog.csdn.net/dbzhang800/article/details/6554104
Qt中关于undefined reference to `vtable for故障总结
http://www.cnblogs.com/qianyuming/archive/2011/03/09/1978910.html
QMessage的示例消息：
http://blog.const.net.cn/a/8744.htm
Qt布局管理器：
http://my.oschina.net/laopiao/blog/83851
SDL中YUV任意尺寸缩放
http://hi.baidu.com/deyaliu/item/5d40bb993e5f84d67b7f019d
数字图像插值算法
http://blog.csdn.net/qiqi5521/article/details/2207562
使用ffmpeg进行图像格式转换及缩放
http://blog.csdn.net/skys_broyal/article/details/10337147
AVFrame和AVPicture对比：
http://yul100887.blog.163.com/blog/static/200336135201211143525930/
Qt初始化最大窗口：
http://www.cnblogs.com/qq78292959/archive/2012/08/12/2634298.html
捕捉窗体变化信号：
http://www.myexception.cn/qt/555086.html
Boost线程管理：
http://www.cnblogs.com/tears-of-ramos/archive/2013/01/21/2870367.html