c/c++代码 打开linux系统的麦克风

以下是使用 ALSA 库打开 Linux 系统麦克风的 C/C++ 代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>

int main() {
    int err;
    char *device = "default";  // 使用默认音频设备
    snd_pcm_t *handle;  // PCM 设备句柄
    snd_pcm_hw_params_t *params;  // PCM 设备硬件参数
    unsigned int sample_rate = 44100;  // 采样率
    unsigned int channels = 1;  // 声道数
    snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;  // 采样格式

    // 打开 PCM 设备
    err = snd_pcm_open(&handle, device, SND_PCM_STREAM_CAPTURE, 0);
    if (err < 0) {
        printf("Error opening PCM device: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // 分配 PCM 设备硬件参数结构体
    snd_pcm_hw_params_alloca(&params);

    // 初始化 PCM 设备硬件参数
    err = snd_pcm_hw_params_any(handle, params);
    if (err < 0) {
        printf("Can't initialize PCM device: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // 设置 PCM 设备硬件参数
    err = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
    if (err < 0) {
        printf("Error setting access: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    err = snd_pcm_hw_params_set_format(handle, params, format);
    if (err < 0) {
        printf("Error setting format: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    err = snd_pcm_hw_params_set_channels(handle, params, channels);
    if (err < 0) {
        printf("Error setting channels: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    err = snd_pcm_hw_params_set_rate_near(handle, params, &sample_rate, 0);
    if (err < 0) {
        printf("Error setting sample rate: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // 将 PCM 设备硬件参数设置到 PCM 设备中
    err = snd_pcm_hw_params(handle, params);
    if (err < 0) {
        printf("Can't set hardware parameters: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // 开始录音
    err = snd_pcm_prepare(handle);
    if (err < 0) {
        printf("Can't prepare audio interface for use: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    printf("Start recording...\n");

    while (1) {
        short buf[1024];  // 缓冲区
        int frames_read;  // 读取到的帧数
        frames_read = snd_pcm_readi(handle, buf, 1024);  // 读取 PCM 数据
        if (frames_read == -EPIPE) {  // 发生数据溢出
            printf("Overrun occurred\n");
            snd_pcm_prepare(handle);
        } else if (frames_read < 0) {  // 其他错误
            printf("Error reading from PCM device: %s\n", snd_strerror(frames