SDL 使用

                                                                                      http://www.libsdl.org/

                 

// 代码是雷神写的 我只是拿过来使用而已 

#include "stdafx.h"
#include <string.h>
#include <iostream>

extern "C"
{
 #include "SDL.h"
};


#undef main   // 注意这个 不然SDL库报一个错误

const int bpp = 12;
int screen_w = 500, screen_h = 500;
const int pixel_w = 320, pixel_h = 180;

unsigned char buffer[pixel_w*pixel_h*bpp / 8];

//Refresh Event
#define REFRESH_EVENT  (SDL_USEREVENT + 1)
//Break
#define BREAK_EVENT  (SDL_USEREVENT + 2)

int thread_exit = 0;

//每隔40毫秒向SDL系统发送一个REFRESH_EVENT事件
int refresh_video(void *opaque) {
    thread_exit = 0;
    while (thread_exit == 0) {
        SDL_Event event;
        event.type = REFRESH_EVENT;
        SDL_PushEvent(&event);
        SDL_Delay(40);
    }
    thread_exit = 0;
    //Break
    SDL_Event event;
    event.type = BREAK_EVENT;
    SDL_PushEvent(&event);
    return 0;
}

int main(int argc, char* argv[])
{
    if (SDL_Init(SDL_INIT_VIDEO)) {
        printf("Could not initialize SDL - %s
", SDL_GetError());
        return -1;
    }

    SDL_Window *screen;
    //SDL 2.0 Support for multiple windows
    screen = SDL_CreateWindow("Simplest Video Play SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
        screen_w, screen_h, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
    if (!screen) {
        printf("SDL: could not create window - exiting:%s
", SDL_GetError());
        return -1;
    }
    SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0);

    Uint32 pixformat = 0;
    //IYUV: Y + U + V  (3 planes)
    //YV12: Y + V + U  (3 planes)
    pixformat = SDL_PIXELFORMAT_IYUV;

    SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer, pixformat, SDL_TEXTUREACCESS_STREAMING, pixel_w, pixel_h);

    FILE *fp = NULL;
    fp = fopen("D:\pthread\Pre-built.2\111.yuv", "rb+");

    if (fp == NULL) {
        while(1)
        { 
            printf("cannot open this file
");
        }
        
        return -1;
    }

    SDL_Rect sdlRect;

    SDL_Thread *refresh_thread = SDL_CreateThread(refresh_video, NULL, NULL);
    SDL_Event event;
    while (1) {
        //收取SDL系统里面的事件
        SDL_WaitEvent(&event);
        if (event.type == REFRESH_EVENT) {
            if (fread(buffer, 1, pixel_w*pixel_h*bpp / 8, fp) != pixel_w*pixel_h*bpp / 8) {
                // Loop
                fseek(fp, 0, SEEK_SET);
                fread(buffer, 1, pixel_w*pixel_h*bpp / 8, fp);
            }

            SDL_UpdateTexture(sdlTexture, NULL, buffer, pixel_w);

            //FIX: If window is resize
            sdlRect.x = 0;
            sdlRect.y = 0;
            sdlRect.w = screen_w;
            sdlRect.h = screen_h;

            SDL_RenderClear(sdlRenderer);
            SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, &sdlRect);
            SDL_RenderPresent(sdlRenderer);

        }
        else if (event.type == SDL_WINDOWEVENT) {
            //If Resize
            SDL_GetWindowSize(screen, &screen_w, &screen_h);
        }
        else if (event.type == SDL_QUIT) {
            thread_exit = 1;
        }
        else if (event.type == BREAK_EVENT) {
            break;
        }
    }
    SDL_Quit();
    return 0;
}