乐山网站营销推广哪家公司好,wordpress修改页面,优化官网咨询,网站设计中遇到的问题01-SDL简介
官网#xff1a;https://www.libsdl.org/ 文档#xff1a;http://wiki.libsdl.org/Introduction SDL#xff08;Simple DirectMedia Layer#xff09;是一套开放源代码的跨平台多媒体开发库#xff0c;使用C语言写成。SDL提供了数种控制图像、声音、输出入的函…01-SDL简介
官网https://www.libsdl.org/ 文档http://wiki.libsdl.org/Introduction SDLSimple DirectMedia Layer是一套开放源代码的跨平台多媒体开发库使用C语言写成。SDL提供了数种控制图像、声音、输出入的函数让开发者只要用相同或是相似的代码就可以开发出跨多个平台Linux、Windows、Mac OS X等的应用软件。目前SDL多用于开发游戏、模拟器、媒体播放器等多媒体应用领域。
02-Windows环境搭建
下载地址https://www.libsdl.org/download-2.0.php
先直接下载dll和lib使用 MinGWMinimalist GNU for Windows
案例 将SDL2-2.0.10拷贝到工程目录 将 SDL2-2.0.10\lib\x86 下的 SDL2.dll 拷贝到工程目录
.prcwin32 {INCLUDEPATH $$PWD/SDL2-2.0.10/includeLIBS $$PWD/SDL2-2.0.10/lib/x86/SDL2.lib
}main.c#include stdio.h#include SDL.h#undef mainint main()
{printf(Hello World!\n);SDL_Window *window NULL; // 声明窗口SDL_Init(SDL_INIT_VIDEO); // 初始化SDL// 创建SDL Windowwindow SDL_CreateWindow(Basic Window, // 标题SDL_WINDOWPOS_UNDEFINED, // xSDL_WINDOWPOS_UNDEFINED, // y640, // 宽480, // 高SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);// 类型if(!window) // 检测是否创建成功{printf(创建 window 失败, err:%s\n, SDL_GetError());return 1;}SDL_Delay(10000); // 延迟10000msSDL_DestroyWindow(window); // 销毁窗口SDL_Quit(); // 释放资源return 0;
}03-Linux环境搭建
下载地址https://www.libsdl.org/download-2.0.php
下载SDL源码库SDL2-2.0.10.tar.gz解压然后依次执行命令 ./configure make sudo make install.如果出现Could not initialize SDL - No available video device(Did you set the DISPLAY variable?)错误 说明系统中没有安装x11的库文件因此编译出来的SDL库实际上不能用。 下载安装 sudo apt-get install libx11-dev sudo apt-get install xorg-dev
04-SDL子系统
SDL将功能分成下列数个子系统subsystem ◼ SDL_INIT_TIMER定时器 ◼ SDL_INIT_AUDIO音频 ◼ SDL_INIT_VIDEO视频 ◼ SDL_INIT_JOYSTICK摇杆 ◼ SDL_INIT_HAPTIC触摸屏 ◼ SDL_INIT_GAMECONTROLLER游戏控制器 ◼ SDL_INIT_EVENTS事件 ◼ SDL_INIT_EVERYTHING包含上述所有选项
05-SDL Window显示SDL视频显示函数简介
◼ SDL_Init()初始化SDL系统 ◼ SDL_CreateWindow()创建窗口SDL_Window ◼ SDL_CreateRenderer()创建渲染器SDL_Renderer ◼ SDL_CreateTexture()创建纹理SDL_Texture ◼ SDL_UpdateTexture()设置纹理的数据 ◼ SDL_RenderCopy()将纹理的数据拷贝给渲染器 ◼ SDL_RenderPresent()显示 ◼ SDL_Delay()工具函数用于延时 ◼ SDL_Quit()退出SDL系统
06-SDL Windows显示SDL数据结构简介
◼ SDL_Window 代表了一个“窗口” ◼ SDL_Renderer 代表了一个“渲染器” ◼ SDL_Texture 代表了一个“纹理” ◼ SDL_Rect 一个简单的矩形结构
存储RGB和存储纹理的区别 比如一个从左到右由红色渐变到蓝色的矩形用存储RGB的话就需要把矩形中每个点的具体颜色值存储下来而纹理只是一些描述信息比如记录了矩形的大小、起始颜色、终止颜色等信息显卡可以通过这些信息推算出矩形块的详细信息。 所以相对于存储RGB而已存储纹理占用的内存要少的多。 案例
新建工程 02-sdl-window 将SDL2-2.0.10拷贝到工程目录 将 SDL2-2.0.10\lib\x86 下的 SDL2.dll 拷贝到工程目录
.prcwin32 {INCLUDEPATH $$PWD/SDL2-2.0.10/includeLIBS $$PWD/SDL2-2.0.10/lib/x86/SDL2.lib
}main.c#include stdio.h
#include SDL.h#undef mainint main()
{int run 1;SDL_Window *window NULL;SDL_Renderer *renderer NULL;SDL_Texture *texture NULL;SDL_Rect rect; // 长方形原点在左上角rect.w 50; //方块大小rect.h 50;SDL_Init(SDL_INIT_VIDEO);//初始化函数,可以确定希望激活的子系统window SDL_CreateWindow(2 Window,SDL_WINDOWPOS_UNDEFINED,SDL_WINDOWPOS_UNDEFINED,640,480,SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);// 创建窗口if (!window){return -1;}renderer SDL_CreateRenderer(window, -1, 0);//基于窗口创建渲染器if (!renderer){return -1;}texture SDL_CreateTexture(renderer,SDL_PIXELFORMAT_RGBA8888,SDL_TEXTUREACCESS_TARGET,640,480); //创建纹理if (!texture){return -1;}int show_count 0;while (run){rect.x rand() % 600;rect.y rand() % 400;SDL_SetRenderTarget(renderer, texture); // 设置渲染目标为纹理SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255); // 纹理背景为黑色SDL_RenderClear(renderer); //清屏SDL_RenderDrawRect(renderer, rect); //绘制一个长方形SDL_SetRenderDrawColor(renderer, 0, 255, 255, 255); //长方形为白色SDL_RenderFillRect(renderer, rect);SDL_SetRenderTarget(renderer, NULL); //恢复默认渲染目标为窗口SDL_RenderCopy(renderer, texture, NULL, NULL); //拷贝纹理到CPUSDL_RenderPresent(renderer); //输出到目标窗口上SDL_Delay(300);if(show_count 30){run 0; // 不跑了}}SDL_DestroyTexture(texture);SDL_DestroyRenderer(renderer);SDL_DestroyWindow(window); //销毁窗口SDL_Quit();return 0;
}运行 07-SDL事件
SDL事件
◼ 函数 • SDL_WaitEvent()等待一个事件 • SDL_PushEvent()发送一个事件 • SDL_PumpEvents()将硬件设备产生的事件放入事件队列用于读取事件在调用该函数之前必须调用SDL_PumpEvents搜集键盘等事件 • SDL_PeepEvents()从事件队列提取一个事件
◼ 数据结构 • SDL_Event代表一个事件
案例
新建工程 03-sdl-event 将 SDL2-2.0.10和SDL2-2.0.10\lib\x86 下的 SDL2.dll 拷贝到工程目录
03-sdl-event.proTEMPLATE app
CONFIG console
CONFIG - app_bundle
CONFIG - qtSOURCES main.cwin32 {INCLUDEPATH $$PWD/SDL2-2.0.10/includeLIBS $$PWD/SDL2-2.0.10/lib/x86/SDL2.lib
}main.c#include stdio.h
#include SDL.h#define FF_QUIT_EVENT (SDL_USEREVENT 2) // 用户自定义事件#undef mainint main(int argc, char* argv[])
{SDL_Window *window NULL; // Declare a pointerSDL_Renderer *renderer NULL;SDL_Init(SDL_INIT_VIDEO); // Initialize SDL2// Create an application window with the following settings:window SDL_CreateWindow(An SDL2 window, // window titleSDL_WINDOWPOS_UNDEFINED, // initial x positionSDL_WINDOWPOS_UNDEFINED, // initial y position640, // width, in pixels480, // height, in pixelsSDL_WINDOW_SHOWN | SDL_WINDOW_BORDERLESS// flags - see below);// Check that the window was successfully createdif (window NULL){// In the case that the window could not be made...printf(Could not create window: %s\n, SDL_GetError());return 1;}/* We must call SDL_CreateRenderer in order for draw calls to affect this window. */renderer SDL_CreateRenderer(window, -1, 0);/* Select the color for drawing. It is set to red here. */SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);/* Clear the entire screen to our selected color. */SDL_RenderClear(renderer);/* Up until now everything was drawn behind the scenes.This will show the new, red contents of the window. */SDL_RenderPresent(renderer);SDL_Event event;int b_exit 0;for (;;){SDL_WaitEvent(event);switch (event.type){case SDL_KEYDOWN: /* 键盘事件 */switch (event.key.keysym.sym){case SDLK_a:printf(key down a\n);break;case SDLK_s:printf(key down s\n);break;case SDLK_d:printf(key down d\n);break;case SDLK_q:printf(key down q and push quit event\n);SDL_Event event_q;event_q.type FF_QUIT_EVENT;SDL_PushEvent(event_q);break;default:printf(key down 0x%x\n, event.key.keysym.sym);break;}break;case SDL_MOUSEBUTTONDOWN: /* 鼠标按下事件 */if (event.button.button SDL_BUTTON_LEFT){printf(mouse down left\n);}else if(event.button.button SDL_BUTTON_RIGHT){printf(mouse down right\n);}else{printf(mouse down %d\n, event.button.button);}break;case SDL_MOUSEMOTION: /* 鼠标移动事件 */printf(mouse movie (%d,%d)\n, event.button.x, event.button.y);break;case FF_QUIT_EVENT:printf(receive quit event\n);b_exit 1;break;}if(b_exit)break;}//destory rendererif (renderer)SDL_DestroyRenderer(renderer);// Close and destroy the windowif (window)SDL_DestroyWindow(window);// Clean upSDL_Quit();return 0;
}构建项目 将 SDL2.dll 拷贝到 build-03-sdl-event-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug 目录 运行 08-SDL线程
SDL多线程 ◼ SDL线程创建SDL_CreateThread ◼ SDL线程等待SDL_WaitThead ◼ SDL互斥锁SDL_CreateMutex/SDL_DestroyMutex ◼ SDL锁定互斥SDL_LockMutex/SDL_UnlockMutex ◼ SDL条件变量(信号量)SDL_CreateCond/SDL_DestoryCond ◼ SDL条件变量(信号量)等待/通知SDL_CondWait/SDL_CondSingal
案例
新建工程 04-sdl-thread 将 SDL2-2.0.10和SDL2-2.0.10\lib\x86 下的 SDL2.dll 拷贝到工程目录
04-sdl-thread.proTEMPLATE app
CONFIG console
CONFIG - app_bundle
CONFIG - qtSOURCES main.cwin32 {INCLUDEPATH $$PWD/SDL2-2.0.10/includeLIBS $$PWD/SDL2-2.0.10/lib/x86/SDL2.lib
}main.c#include SDL.h
#include stdio.hSDL_mutex *s_lock NULL;
SDL_cond *s_cond NULL;int thread_work(void *arg)
{SDL_LockMutex(s_lock);printf( thread_work sleep\n);sleep(10); // 用来测试获取锁printf( thread_work wait\n);// 释放s_lock资源并等待signal。之所以释放s_lock是让别的线程能够获取到s_lockSDL_CondWait(s_cond, s_lock); //另一个线程(1)发送signal和(2)释放lock后这个函数退出printf( thread_work receive signal, continue to do ~_~!!!\n);printf( thread_work end\n);SDL_UnlockMutex(s_lock);return 0;
}#undef main
int main()
{s_lock SDL_CreateMutex();s_cond SDL_CreateCond();SDL_Thread * t SDL_CreateThread(thread_work,thread_work,NULL);if(!t){printf( %s,SDL_GetError);return -1;}for(int i 0;i 2;i){sleep(2);printf(main execute \n);}printf(main SDL_LockMutex(s_lock) before \n);SDL_LockMutex(s_lock); // 获取锁但是子线程还拿着锁printf(main ready send signal\n);printf(main SDL_CondSignal(s_cond) before \n);SDL_CondSignal(s_cond); // 发送信号唤醒等待的线程printf(main SDL_CondSignal(s_cond) after \n);sleep(10);SDL_UnlockMutex(s_lock);// 释放锁让其他线程可以拿到锁printf(main SDL_UnlockMutex(s_lock) after \n);SDL_WaitThread(t, NULL);SDL_DestroyMutex(s_lock);SDL_DestroyCond(s_cond);return 0;
}构建项目 将 SDL2.dll 拷贝到 build-04-sdl-thread-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug 目录 运行 09-SDL YUV显示SDL视频显示的流程 案例
新建工程 05-sdl-yuv 将 SDL2-2.0.10和SDL2-2.0.10\lib\x86 下的 SDL2.dll 拷贝到工程目录
05-sdl-yuv.proTEMPLATE app
CONFIG console
CONFIG - app_bundle
CONFIG - qtSOURCES main.cwin32 {INCLUDEPATH $$PWD/SDL2-2.0.10/includeLIBS $$PWD/SDL2-2.0.10/lib/x86/SDL2.lib
}main.c#include stdio.h
#include string.h#include SDL.h//自定义消息类型
#define REFRESH_EVENT (SDL_USEREVENT 1) // 请求画面刷新事件
#define QUIT_EVENT (SDL_USEREVENT 2) // 退出事件//定义分辨率
// YUV像素分辨率
#define YUV_WIDTH 320
#define YUV_HEIGHT 240
//定义YUV格式
#define YUV_FORMAT SDL_PIXELFORMAT_IYUVint s_thread_exit 0; // 退出标志 1则退出int refresh_video_timer(void *data)
{while (!s_thread_exit){SDL_Event event;event.type REFRESH_EVENT;SDL_PushEvent(event);SDL_Delay(40);}s_thread_exit 0;//push quit eventSDL_Event event;event.type QUIT_EVENT;SDL_PushEvent(event);return 0;
}
#undef main
int main(int argc, char* argv[])
{//初始化 SDLif(SDL_Init(SDL_INIT_VIDEO)){fprintf( stderr, Could not initialize SDL - %s\n, SDL_GetError());return -1;}// SDLSDL_Event event; // 事件SDL_Rect rect; // 矩形SDL_Window *window NULL; // 窗口SDL_Renderer *renderer NULL; // 渲染SDL_Texture *texture NULL; // 纹理SDL_Thread *timer_thread NULL; // 请求刷新线程uint32_t pixformat YUV_FORMAT; // YUV420P即是SDL_PIXELFORMAT_IYUV// 分辨率// 1. YUV的分辨率int video_width YUV_WIDTH;int video_height YUV_HEIGHT;// 2.显示窗口的分辨率int win_width YUV_WIDTH;int win_height YUV_WIDTH;// YUV文件句柄FILE *video_fd NULL;const char *yuv_path yuv420p_320x240.yuv;size_t video_buff_len 0;uint8_t *video_buf NULL; //读取数据后先把放到buffer里面// 我们测试的文件是YUV420P格式uint32_t y_frame_len video_width * video_height;uint32_t u_frame_len video_width * video_height / 4;uint32_t v_frame_len video_width * video_height / 4;uint32_t yuv_frame_len y_frame_len u_frame_len v_frame_len;//创建窗口window SDL_CreateWindow(Simplest YUV Player,SDL_WINDOWPOS_UNDEFINED,SDL_WINDOWPOS_UNDEFINED,video_width, video_height,SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);if(!window){fprintf(stderr, SDL: could not create window, err:%s\n,SDL_GetError());goto _FAIL;}// 基于窗口创建渲染器renderer SDL_CreateRenderer(window, -1, 0);// 基于渲染器创建纹理texture SDL_CreateTexture(renderer,pixformat,SDL_TEXTUREACCESS_STREAMING,video_width,video_height);// 分配空间video_buf (uint8_t*)malloc(yuv_frame_len);if(!video_buf){fprintf(stderr, Failed to alloce yuv frame space!\n);goto _FAIL;}// 打开YUV文件video_fd fopen(yuv_path, rb);if( !video_fd ){fprintf(stderr, Failed to open yuv file\n);goto _FAIL;}// 创建请求刷新线程timer_thread SDL_CreateThread(refresh_video_timer,NULL,NULL);while (1){// 收取SDL系统里面的事件SDL_WaitEvent(event);if(event.type REFRESH_EVENT) // 画面刷新事件{video_buff_len fread(video_buf, 1, yuv_frame_len, video_fd);if(video_buff_len 0){fprintf(stderr, Failed to read data from yuv file!\n);goto _FAIL;}// 设置纹理的数据 video_width 320 planeSDL_UpdateTexture(texture, NULL, video_buf, video_width);// 显示区域可以通过修改w和h进行缩放rect.x 0;rect.y 0;float w_ratio win_width * 1.0 /video_width;float h_ratio win_height * 1.0 /video_height;// 320x240 怎么保持原视频的宽高比例rect.w video_width * w_ratio;rect.h video_height * h_ratio;
// rect.w video_width * 0.5;
// rect.h video_height * 0.5;// 清除当前显示SDL_RenderClear(renderer);// 将纹理的数据拷贝给渲染器SDL_RenderCopy(renderer, texture, NULL, rect);// 显示SDL_RenderPresent(renderer);}else if(event.type SDL_WINDOWEVENT){//If ResizeSDL_GetWindowSize(window, win_width, win_height);printf(SDL_WINDOWEVENT win_width:%d, win_height:%d\n,win_width,win_height );}else if(event.type SDL_QUIT) //退出事件{s_thread_exit 1;}else if(event.type QUIT_EVENT){break;}}_FAIL:s_thread_exit 1; // 保证线程能够退出// 释放资源if(timer_thread)SDL_WaitThread(timer_thread, NULL); // 等待线程退出if(video_buf)free(video_buf);if(video_fd)fclose(video_fd);if(texture)SDL_DestroyTexture(texture);if(renderer)SDL_DestroyRenderer(renderer);if(window)SDL_DestroyWindow(window);SDL_Quit();return 0;}构建项目 将 SDL2.dll 拷贝到 build-05-sdl-yuv-Desktop_Qt_5_10_1_MinGW_32bit-Debug 目录 将 yuv420p_320x240.yuv 文件 拷贝到build-05-sdl-yuv-Desktop_Qt_5_10_1_MinGW_32bit-Debug目录
运行 10-SDL播放音频PCM-打开音频设备
打开音频设备
int SDLCALL SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained);
// desired期望的参数。
// obtained实际音频设备的参数一般情况下设置为NULL即可。SDL_AudioSpec
typedef struct SDL_AudioSpec {int freq; // 音频采样率SDL_AudioFormat format; // 音频数据格式Uint8 channels; // 声道数: 1 单声道, 2 立体声Uint8 silence; // 设置静音的值因为声音采样是有符号的所以0当然就是这个值Uint16 samples; // 音频缓冲区中的采样个数要求必须是2的n次Uint16 padding; // 考虑到兼容性的一个参数Uint32 size; // 音频缓冲区的大小以字节为单位SDL_AudioCallback callback; // 填充音频缓冲区的回调函数void *userdata; // 用户自定义的数据
} SDL_AudioSpec;11-SDL播放音频PCM-SDL_AudioCallback
SDL_AudioCallback
// userdataSDL_AudioSpec结构中的用户自定义数据一般情况下可以不用。
// stream该指针指向需要填充的音频缓冲区。
// len音频缓冲区的大小以字节为单位1024*2*2。
void (SDLCALL * SDL_AudioCallback) (void *userdata, Uint8 *stream, int len);播放音频数据
// 当pause_on设置为0的时候即可开始播放音频数据。设置为1的时候将会
播放静音的值。
void SDLCALL SDL_PauseAudio(int pause_on)12-SDL播放音频PCM-代码
案例
新建工程 06-sdl-pcm 将 SDL2-2.0.10和SDL2-2.0.10\lib\x86 下的 SDL2.dll 拷贝到工程目录
06-sdl-pcm.proTEMPLATE app
CONFIG console
CONFIG - app_bundle
CONFIG - qtSOURCES main.cwin32 {INCLUDEPATH $$PWD/SDL2-2.0.10/includeLIBS $$PWD/SDL2-2.0.10/lib/x86/SDL2.lib
}main.c/*** SDL2播放PCM** 本程序使用SDL2播放PCM音频采样数据。SDL实际上是对底层绘图* APIDirect3DOpenGL的封装使用起来明显简单于直接调用底层* API。* 测试的PCM数据采用采样率44.1k, 采用精度S16SYS, 通道数2** 函数调用步骤如下:** [初始化]* SDL_Init(): 初始化SDL。* SDL_OpenAudio(): 根据参数存储于SDL_AudioSpec打开音频设备。* SDL_PauseAudio(): 播放音频数据。** [循环播放数据]* SDL_Delay(): 延时等待播放完成。**/#include stdio.h
#include SDL.h// 每次读取2帧数据, 以1024个采样点一帧 2通道 16bit采样点为例
#define PCM_BUFFER_SIZE (1024*2*2*2)// 音频PCM数据缓存
static Uint8 *s_audio_buf NULL;
// 目前读取的位置
static Uint8 *s_audio_pos NULL;
// 缓存结束位置
static Uint8 *s_audio_end NULL;//音频设备回调函数
void fill_audio_pcm(void *udata, Uint8 *stream, int len)
{SDL_memset(stream, 0, len);if(s_audio_pos s_audio_end) // 数据读取完毕{return;}// 数据够了就读预设长度数据不够就只读部分不够的时候剩多少就读取多少int remain_buffer_len s_audio_end - s_audio_pos;len (len remain_buffer_len) ? len : remain_buffer_len;// 拷贝数据到stream并调整音量SDL_MixAudio(stream, s_audio_pos, len, SDL_MIX_MAXVOLUME/8);printf(len %d\n, len);s_audio_pos len; // 移动缓存指针
}// 提取PCM文件
// ffmpeg -i input.mp4 -t 20 -codec:a pcm_s16le -ar 44100 -ac 2 -f s16le 44100_16bit_2ch.pcm
// 测试PCM文件
// ffplay -ar 44100 -ac 2 -f s16le 44100_16bit_2ch.pcm
#undef main
int main(int argc, char *argv[])
{int ret -1;FILE *audio_fd NULL;SDL_AudioSpec spec;const char *path 44100_16bit_2ch.pcm;// 每次缓存的长度size_t read_buffer_len 0;//SDL initializeif(SDL_Init(SDL_INIT_AUDIO)) // 支持AUDIO{fprintf(stderr, Could not initialize SDL - %s\n, SDL_GetError());return ret;}//打开PCM文件audio_fd fopen(path, rb);if(!audio_fd){fprintf(stderr, Failed to open pcm file!\n);goto _FAIL;}s_audio_buf (uint8_t *)malloc(PCM_BUFFER_SIZE);// 音频参数设置SDL_AudioSpecspec.freq 44100; // 采样频率spec.format AUDIO_S16SYS; // 采样点格式spec.channels 2; // 2通道spec.silence 0;spec.samples 1024; // 23.2ms - 46.4ms 每次读取的采样数量多久产生一次回调和 samplesspec.callback fill_audio_pcm; // 回调函数spec.userdata NULL;//打开音频设备if(SDL_OpenAudio(spec, NULL)){fprintf(stderr, Failed to open audio device, %s\n, SDL_GetError());goto _FAIL;}//play audioSDL_PauseAudio(0);int data_count 0;while(1){// 从文件读取PCM数据read_buffer_len fread(s_audio_buf, 1, PCM_BUFFER_SIZE, audio_fd);if(read_buffer_len 0){break;}data_count read_buffer_len; // 统计读取的数据总字节数printf(now playing %10d bytes data.\n,data_count);s_audio_end s_audio_buf read_buffer_len; // 更新buffer的结束位置s_audio_pos s_audio_buf; // 更新buffer的起始位置//the main thread wait for a momentwhile(s_audio_pos s_audio_end){SDL_Delay(10); // 等待PCM数据消耗}}printf(play PCM finish\n);// 关闭音频设备SDL_CloseAudio();_FAIL://release some resourcesif(s_audio_buf)free(s_audio_buf);if(audio_fd)fclose(audio_fd);//quit SDLSDL_Quit();return 0;
}构建项目 将 SDL2.dll 拷贝到 build-06-sdl-pcm-Desktop_Qt_5_10_1_MinGW_32bit-Debug 目录 将 44100_16bit_2ch.pcm 文件 拷贝到 build-06-sdl-pcm-Desktop_Qt_5_10_1_MinGW_32bit-Debug 目录
运行
