SDL播放yuv数据

系统管理员 2022-08-03 13:43 195阅读 0赞

#include <stdio.h>
    
    extern "C"
    {
    #include "sdl/SDL.h";
    #include "sdl/SDL_thread.h";
    };
    
    
    int screen_w = 500, screen_h = 500;
    const int pixel_w = 320, pixel_h = 180;
    const int bpp = 12;
    unsigned char buffer[pixel_w*pixel_h*bpp/8];
    
    // refresh event
    #define REFRESH_EVENT (SDL_USEREVENT+1)
    int thread_exit = 0;
    
    int refresh_video(void *opaque)
    {
    	while (thread_exit==0)
    	{
    		SDL_Event event;
    		event.type = REFRESH_EVENT;
    		SDL_PushEvent(&event);
    		SDL_Delay(40);
    	}
    	return 0;
    }
    
    int main()
    {
    
    	if(SDL_Init(SDL_INIT_VIDEO)) 
    	{  
    		printf( "Could not initialize SDL - %s\n", SDL_GetError()); 
    		return -1;
    	} 
    
    	//create window
    	SDL_Window *screen;
    	screen = SDL_CreateWindow("Video player by 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\n", SDL_GetError());
    		return -1;
    	}
    
    	//create renderer
    	SDL_Renderer *sdlRenderer = SDL_CreateRenderer(screen, -1, 0);
    	
    	Uint32 pixformat = 0;
    	pixformat = SDL_PIXELFORMAT_IYUV;
    
    	//create texture
    	SDL_Texture *sdlTexture = SDL_CreateTexture(sdlRenderer, pixformat, SDL_TEXTUREACCESS_STREAMING, pixel_w, pixel_h);
    
    	//open file
    	FILE *fp = NULL;
    	fp = fopen("../test_yuv420p_320x180.yuv", "rb+");
    	if (fp==NULL)
    	{
    		printf("Can't open yuv file!\n");
    		return -1;
    	}
    
    	//create rect
    	SDL_Rect sdlRect;
    	SDL_Thread *refresh_thread = SDL_CreateThread(refresh_video, NULL, NULL);
    	SDL_Event event;
    	while (1)
    	{
    		//wait
    		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) //未能读取合适大小数据,重新读取
    			{
    				//loop
    				fseek(fp, 0, SEEK_SET);
    				fread(buffer, 1, pixel_w*pixel_h*bpp/8, fp);
    			}
    
    			//update yuv data
    			SDL_UpdateTexture(sdlTexture, NULL, buffer, pixel_w);
    			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);
    			//delay
    			SDL_Delay(40);
    		} else if (event.type==SDL_WINDOWEVENT) {
    			SDL_GetWindowSize(screen, &screen_w, &screen_h);
    		} else if (event.type==SDL_QUIT) {
    			break;
    		}
    	}
    
    	return 0;
    }

参考：http://blog.csdn.net/leixiaohua1020/article/details/40525591