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   源码介绍

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基于ffmpeg库的视频播放源码，使用QT5.12以上编译环境。

int main(int argc, char *argv[])
{
    MediaState *pMedia;

    av_log_set_flags(AV_LOG_SKIP_REPEATED);

    //avdevice_register_all();
    avformat_network_init();

    av_init_packet(&flush_pkt);
    flush_pkt.data = (uint8_t *)&flush_pkt;

    input_filename = "./test.mpg";

/* 初始化SDL子系统 */
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER))
{
av_log(NULL, AV_LOG_FATAL, "Could not initialize SDL - %s\n", SDL_GetError());
av_log(NULL, AV_LOG_FATAL, "(Did you set the DISPLAY variable?)\n");
        //exit(1);
}

//设置事件的处理状态，以下两种事件将自动从事件队列中删除
SDL_EventState(SDL_SYSWMEVENT, SDL_IGNORE);
SDL_EventState(SDL_USEREVENT, SDL_IGNORE);

/* 以默认宽高建立窗口 */
window = SDL_CreateWindow("OnePlayer", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
default_width, default_height, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
//设置缩放的算法级别
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
//创建渲染器
if (window) 
{
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (!renderer) 
{
av_log(NULL, AV_LOG_WARNING, "Failed to initialize a hardware accelerated renderer: %s\n", SDL_GetError());
renderer = SDL_CreateRenderer(window, -1, 0);
}
if (renderer) 
{
if (!SDL_GetRendererInfo(renderer, &renderer_info))
av_log(NULL, AV_LOG_VERBOSE, "Initialized %s renderer.\n", renderer_info.name);
}
}
if (!window || !renderer || !renderer_info.num_texture_formats) 
{
av_log(NULL, AV_LOG_FATAL, "Failed to create window or renderer: %s", SDL_GetError());
do_exit(NULL);
}


// 打开流
    pMedia = stream_open(input_filename);
    if (!pMedia)
{
av_log(NULL, AV_LOG_FATAL, "Failed to initialize MediaState!\n");
do_exit(NULL);
}

//进入事件循环
    event_loop(pMedia);

return 0;
}