sudo apt update
sudo apt install build-essential

sudo apt install libasound2-dev

sudo apt install libfftw3-dev

aplay -l

**** List of PLAYBACK Hardware Devices ****
card 1: USB [USB PnP Sound Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

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

#define PCM_DEVICE "default"

int main() {
    long loops;
    int rc;
    int size;
    snd_pcm_t *pcm_handle;
    snd_pcm_hw_params_t *params;
    snd_pcm_uframes_t frames;
    char *buffer;

    // 打開音頻設(shè)備
    rc = snd_pcm_open(&pcm_handle, PCM_DEVICE, SND_PCM_STREAM_CAPTURE, 0);
    if (rc < 0) {
        fprintf(stderr, "無法打開音頻設(shè)備 '%s': %s\n", PCM_DEVICE, snd_strerror(rc));
        return EXIT_FAILURE;
    }

    // 分配硬件參數(shù)對象
    snd_pcm_hw_params_alloca(&params);

    // 填充默認硬件參數(shù)
    snd_pcm_hw_params_any(pcm_handle, params);
    snd_pcm_hw_params_set_access(pcm_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
    snd_pcm_hw_params_set_format(pcm_handle, params, SND_PCM_FORMAT_S16_LE);
    snd_pcm_hw_params_set_channels(pcm_handle, params, 1);
    snd_pcm_hw_params_set_rate(pcm_handle, params, 44100, 0);
    frames = 32;
    snd_pcm_hw_params_set_period_size(pcm_handle, params, frames, 0);

    // 寫入硬件參數(shù)
    rc = snd_pcm_hw_params(pcm_handle, params);
    if (rc < 0) {
        fprintf(stderr, "無法設(shè)置硬件參數(shù): %s\n", snd_strerror(rc));
        return EXIT_FAILURE;
    }

    // 獲取周期大小
    snd_pcm_hw_params_get_period_size(params, &frames, 0);
    size = frames * 2; // 2 bytes/sample, 1 channels
    buffer = (char *) malloc(size);

    // 開始音頻采集
    snd_pcm_prepare(pcm_handle);
    for (loops = 0; loops < 10000; loops++) {
        rc = snd_pcm_readi(pcm_handle, buffer, frames);
        if (rc == -EPIPE) {
            // EPIPE means overrun
            fprintf(stderr, "緩沖區(qū)溢出。\n");
            snd_pcm_prepare(pcm_handle);
        } else if (rc < 0) {
            fprintf(stderr, "音頻采集錯誤: %s\n", snd_strerror(rc));
        }
    }

    snd_pcm_drain(pcm_handle);
    snd_pcm_close(pcm_handle);
    free(buffer);

    return 0;
}

gcc -o audio_capture audio_capture.c -lasound

./audio_capture

#include <stdio.h>
#include <stdlib.h>
#include <fftw3.h>

#define SAMPLE_RATE 44100
#define BUFFER_SIZE 1024

int main() {
    fftw_complex *in, *out;
    fftw_plan p;
    int i;

    // 分配輸入和輸出數(shù)組
    in = (fftw_complex *) fftw_malloc(sizeof(fftw_complex) * BUFFER_SIZE);
    out = (fftw_complex *) fftw_malloc(sizeof(fftw_complex) * BUFFER_SIZE);

    // 創(chuàng)建FFT計劃
    p = fftw_plan_dft_1d(BUFFER_SIZE, in, out, FFTW_FORWARD, FFTW_ESTIMATE);

    // 填充輸入數(shù)組（這里使用隨機數(shù)據(jù)模擬音頻信號）
    for (i = 0; i < BUFFER_SIZE; i++) {
        in[i][0] = (double) rand() / RAND_MAX; // 實部
        in[i][1] = (double) rand() / RAND_MAX; // 虛部
    }

    // 執(zhí)行FFT
    fftw_execute(p);

    // 輸出FFT結(jié)果
    for (i = 0; i < BUFFER_SIZE; i++) {
        printf("頻率：%d, 幅度：%f\n", i * SAMPLE_RATE / BUFFER_SIZE, out[i][0]);
    }

    // 清理資源
    fftw_destroy_plan(p);
    fftw_free(in);
    fftw_free(out);

    return 0;
}

gcc -o audio_analysis audio_analysis.c -lfftw3

./audio_analysis

 void trigger_alarm() {
     printf("警報！檢測到異常音頻信號！\n");
     // 可以在這里添加更多的警報邏輯，例如發(fā)送郵件、短信等
 }

 int main() {
     // 模擬警報觸發(fā)
     trigger_alarm();

     return 0;
 }
 ```

gcc -o alarm alarm.c

./alarm

frames = 64;