linux c语言mp3播放器

#include <stdio.h>
#include <mpg123.h>
#include <alsa/asoundlib.h>

int main(int argc, char *argv[]) {
    mpg123_handle *mh;
    unsigned char *buffer;
    size_t buffer_size;
    size_t done;
    int err;

    int driver;
    snd_pcm_t *pcm;
    snd_pcm_hw_params_t *hwparams;
    snd_pcm_sw_params_t *swparams;
    int rate = 44100;
    snd_pcm_uframes_t frames;

    if (argc < 2) {
        fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
        return 1;
    }

    mpg123_init();
    mh = mpg123_new(NULL, &err);
    buffer_size = mpg123_outblock(mh);
    buffer = (unsigned char*) malloc(buffer_size);

    mpg123_open(mh, argv[1]);
    mpg123_getformat(mh, &rate, &done, &err);

    snd_pcm_open(&pcm, "default", SND_PCM_STREAM_PLAYBACK, 0);
    snd_pcm_hw_params_alloca(&hwparams);
    snd_pcm_hw_params_any(pcm, hwparams);
    snd_pcm_hw_params_set_access(pcm, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
    snd_pcm_hw_params_set_format(pcm, hwparams, SND_PCM_FORMAT_S16_LE);
    snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rate, 0);
    snd_pcm_hw_params_set_channels(pcm, hwparams, done);
    snd_pcm_hw_params(pcm, hwparams);

    while (mpg123_read(mh, buffer, buffer_size, &done) == MPG123_OK) {
        frames = done / (2 * done);
        snd_pcm_writei(pcm, buffer, frames);
    }

    free(buffer);
    mpg123_close(mh);
    mpg123_delete(mh);
    mpg123_exit();
    snd_pcm_close(pcm);

    return 0;
}