使用SDL播放一张YUV图片

代码

sdl2_demo.c

#include <stdio.h>
#include <SDL2/SDL.h>

// 显示窗口大小
int WINDOW_W = 640;
int WINDOW_H = 480;

int thread_exit = 0;

int refresh_video(void *opaque)
{
    while(thread_exit == 0)
    {
        SDL_Event event;
        event.type = SDL_USEREVENT + 1;
        SDL_PushEvent(&event);
        SDL_Delay(40);
    }
    printf("exit refresh video thread.\n");
    return 0;
}

int main()
{
    SDL_Init(SDL_INIT_VIDEO);

    SDL_Window *window = SDL_CreateWindow("SDL Demo", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WINDOW_W, WINDOW_H, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);

    SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);

    SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, WINDOW_W, WINDOW_H);

    FILE *fp = fopen("test.iyuv", "rb");
    if (!fp)
    {
        printf("Cannot open the file.\n");
        return -1;
    }

    // 图片的宽高
    const int IMG_W = 640;
    const int IMG_H = 480;

    uint8_t buff[IMG_W * IMG_H * 3 / 2];
    fread(buff, 1, IMG_W * IMG_H * 3 / 2, fp);
    fclose(fp);

    SDL_Thread *thread = SDL_CreateThread(refresh_video, NULL, NULL);

    SDL_Event event;
    SDL_Rect rect;

    while (1)
    {
        SDL_WaitEvent(&event);
        if (event.type == SDL_USEREVENT + 1)
        {
            SDL_UpdateTexture(texture, NULL, buff, IMG_W);

            rect.x = 0;
            rect.y = 0;
            rect.w = WINDOW_W;
            rect.h = WINDOW_H;

            SDL_RenderClear(renderer);
            SDL_RenderCopy(renderer, texture, NULL, &rect);
            SDL_RenderPresent(renderer);

            SDL_Delay(40);
        }
        else if(event.type == SDL_WINDOWEVENT)
        {
            SDL_GetWindowSize(window, &WINDOW_W, &WINDOW_H);
            printf("window resize, w=%d h=%d\n", WINDOW_W, WINDOW_H);
        }
        else if(event.type == SDL_QUIT)
        {
            printf("Exit.\n");
            break;
        }
    }

    return 0;
}

编译

新建编译脚本，如build.sh

内容如下，SDL2的安装目录$PREFIX根据实际情况修改

#!/bin/bash
PREFIX=/usr/local
gcc sdl_demo.c -o sdl_demo -I $PREFIX/include -L $PREFIX/lib -lSDL2

执行脚本即可编译。

上述代码下载

• https://github.com/630381030/SDL2-Demo/tree/master/%E6%92%AD%E6%94%BE%E4%B8%80%E5%BC%A0YUV%E5%9B%BE%E7%89%87

参考

• 最简单的视音频播放示例7：SDL2播放RGB/YUV