linux下用c编写mp3播放

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

// 初始化音频设备
snd_pcm_t *init_audio_device() {
    snd_pcm_t *handle;
    snd_pcm_hw_params_t *params;
    int err;

    // 打开 PCM 设备
    if ((err = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
        fprintf(stderr, "无法打开音频设备: %s\n", snd_strerror(err));
        exit(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);

    // 设置采样率
    snd_pcm_hw_params_set_rate_near(handle, params, &sample_rate, 0);

    // 设置声道数
    snd_pcm_hw_params_set_channels(handle, params, channels);

    // 应用参数
    if ((err = snd_pcm_hw_params(handle, params)) < 0) {
        fprintf(stderr, "无法设置音频参数: %s\n", snd_strerror(err));
        exit(1);
    }

    return handle;
}

// 播放音频数据
void play_audio(snd_pcm_t *handle, short *buffer, int size) {
    snd_pcm_sframes_t frames;

    while (size > 0) {
        frames = snd_pcm_writei(handle, buffer, size / sizeof(short));
        if (frames < 0) {
            fprintf(stderr, "播放错误: %s\n", snd_strerror(frames));
            break;
        }
        buffer += frames * channels;
        size -= frames * channels * sizeof(short);
    }
}

int main() {
    // 初始化音频设备
    snd_pcm_t *handle = init_audio_device();

    // 读取 MP3 文件并解码为 PCM 数据（此处省略解码部分）
    short buffer[BUFFER_SIZE];
    int size = read_and_decode_mp3("example.mp3", buffer, BUFFER_SIZE);

    // 播放音频
    play_audio(handle, buffer, size);

    // 关闭音频设备
    snd_pcm_close(handle);

    return 0;
}