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1. SDL2：PC端编译使用

1.1 安装必要的依赖

首先，确保安装了编译SDL2所需的依赖库：

sudo apt-get update
sudo apt-get install -y autoconf automake libtool pkg-config
sudo apt-get install libx11-dev libxext-dev libxrandr-dev libxinerama-dev libxcursor-dev
sudo apt-get install libgl1-mesa-dev libglu1-mesa-dev

1.2 下载编译SDL2

wget https://www.libsdl.org/release/SDL2-2.28.4.tar.gz
tar -zxvf SDL2-2.28.4.tar.gzcd SDL2-2.28.4
mkdir build_pc
cd build_pccmake .. \-DCMAKE_INSTALL_PREFIX=$(pwd)/_install_pc \-DSDL_STATIC=ON \-DSDL_SHARED=OFFmake
make install

1.3 SDL2使用示例：Audio

（1）main.cpp示例：

• 使用SDL2从音频设备获取输入数据，并使用printf打印相关信息。

#include <SDL2/SDL.h>
#include <stdio.h>// 音频回调函数
void audioCallback(void* userdata, Uint8* stream, int len) {// 这里可以处理音频数据，例如保存到文件或进行实时处理// 本示例中不进行处理，仅打印信息printf("Captured %d bytes of audio data.\n", len);
}int main(int argc, char* argv[]) {// 初始化SDL音频子系统if (SDL_Init(SDL_INIT_AUDIO) < 0) {printf("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());return -1;}// 定义音频规格SDL_AudioSpec want, have;SDL_zero(want);want.freq = 44100;  // 采样率want.format = AUDIO_S16SYS;  // 采样格式want.channels = 2;  // 双声道want.samples = 1024;  // 缓冲区大小want.callback = audioCallback;  // 指定音频回调函数want.userdata = nullptr;// 打开音频设备SDL_AudioDeviceID deviceId = SDL_OpenAudioDevice(nullptr, 1, &want, &have, 0);if (deviceId == 0) {printf("SDL could not open audio device! SDL_Error: %s\n", SDL_GetError());SDL_Quit();return -1;}// 检查音频规格是否符合预期if (have.freq != want.freq || have.format != want.format || have.channels != want.channels) {printf("Audio specification mismatch.\n");SDL_CloseAudioDevice(deviceId);SDL_Quit();return -1;}// 播放音频SDL_PauseAudioDevice(deviceId, 0);// 持续捕获音频数据printf("Capturing audio... Press Enter to stop.\n");getchar();// 停止音频捕获SDL_PauseAudioDevice(deviceId, 1);// 关闭音频设备SDL_CloseAudioDevice(deviceId);// 退出SDLSDL_Quit();return 0;
}

（2）编译

使用Makefile编译：

SDL2_DIR := /home/archermind/Env/Tools/SDL2-2.28.4/build_pc/_install_pc/
SDL2_INCLUDE := \-I${SDL2_DIR}/include \-I${SDL2_DIR}/include/SDL2
SDL2_LIB := ${SDL2_DIR}/lib/CXX := g++
LDFLAGS := -L$(SDL2_LIB) -lSDL2
CXXFLAGS := -g -O3 -fPIC -std=gnu++20TARGET := audio_capture
$(TARGET):$(CXX) $(CXXFLAGS) $(SDL2_INCLUDE) -o main.cpp.o -c main.cpp$(CXX) $(CXXFLAGS) -o $(TARGET) main.cpp.o $(LDFLAGS)clean:rm -f $(TARGET) *.o

生成audio_capture可执行文件，执行编译：make

1.4 运行示例程序

在终端中运行编译好的程序：

./audio_capture

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