linux3.10+声卡驱动

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

int main() {
    snd_pcm_t *handle;
    snd_pcm_hw_params_t *params;
    char *buffer;
    int size, dir;
    snd_pcm_uframes_t frames;

    // 打开 PCM 设备
    if (snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0) < 0) {
        perror("snd_pcm_open");
        return 1;
    }

    // 分配硬件参数对象
    snd_pcm_hw_params_alloca(&params);

    // 设置默认参数
    snd_pcm_hw_params_any(handle, params);
    snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
    snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
    snd_pcm_hw_params_set_rate_near(handle, params, &rate, &dir);
    snd_pcm_hw_params_set_channels(handle, params, 2);

    // 应用参数
    snd_pcm_hw_params(handle, params);

    // 计算缓冲区大小
    snd_pcm_hw_params_get_period_size(params, &frames, &dir);
    size = frames * 4; // 2 bytes/sample, 2 channels
    buffer = (char *)malloc(size);

    // 读取并播放音频文件（此处省略文件读取代码）

    free(buffer);
    snd_pcm_close(handle);
    return 0;
}

gcc -o alsa_playback alsa_playback.c -lasound
./alsa_playback