linux alsa测试

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

int main(int argc, char **argv) {
    int err;
    snd_pcm_t *handle;
    snd_pcm_sframes_t frames;
    char *buffer;
    int buffer_size;

    if ((err = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
        fprintf(stderr, "cannot open pcm device (%s)\n", snd_strerror(err));
        return 1;
    }

    snd_pcm_set_params(handle, SND_PCM_FORMAT_S16_LE, SND_PCM_ACCESS_RW_INTERLEAVED,
                      2, 44100, 1, 500000);

    buffer_size = 44100 * 2 * 2; // 1 second of stereo 16-bit audio at 44.1kHz
    buffer = malloc(buffer_size);

    // Fill buffer with audio data (e.g., from a file or generated)

    frames = snd_pcm_writei(handle, buffer, buffer_size / 4);
    if (frames < 0) frames = snd_pcm_recover(handle, frames, 0);
    if (frames < 0) {
        fprintf(stderr, "error writing to pcm device (%s)\n", snd_strerror(frames));
        return 1;
    }

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