如何在Linux中以编程方式查找ALSA音频设备功能而无需打开设备

#include <alsa/asoundlib.h>

int main() {
    int err;
    snd_ctl_t *handle;
    snd_ctl_card_info_t *info;
    snd_ctl_card_info_alloca(&info);

    // 打开控制设备
    if ((err = snd_ctl_open(&handle, "default", 0)) < 0) {
        printf("Control device open error: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // 获取卡信息
    if ((err = snd_ctl_card_info(handle, info)) < 0) {
        printf("Card info error: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    // 打印卡信息
    printf("Card: %s\n", snd_ctl_card_info_get_name(info));
    printf("ID: %d\n", snd_ctl_card_info_get_card(info));

    // 关闭控制设备
    snd_ctl_close(handle);

    return 0;
}