[BeagleBone] help for snd_pcm_writei

hi,

I would like play a wav file with “snd_pcm_writei()”. i try this but it does not work:

/*

  • This extra small demo sends a random samples to your speakers.
    */
    #include <alsa/asoundlib.h>
    #include <stdio.h>
    #include <stdlib.h>

snd_output_t output = NULL;
unsigned char buffer[16
1024]; /* some random data */
int main(void)
{
int err;
unsigned int i;
snd_pcm_t handle;
snd_pcm_sframes_t frames;
for (i = 0; i < sizeof(buffer); i++)
buffer[i] = random() & 0xff;
if ((err = snd_pcm_open(&handle, “default”, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
printf(“Playback open error: %s\n”, snd_strerror(err));
exit(EXIT_FAILURE);
}
if ((err = snd_pcm_set_params(handle,
SND_PCM_FORMAT_U8,
SND_PCM_ACCESS_RW_INTERLEAVED,
1,
32000,
1,
500000)) < 0) { /
0.5sec /
printf(“Playback open error: %s\n”, snd_strerror(err));
exit(EXIT_FAILURE);
}
int ok;
long lSize;
char * buffer2;
ok = open(“balle_32.wav”, O_RDONLY);
if(ok < 0)
{
perror(“open”);
exit (1);
}
lSize = lseek (ok , 0 , SEEK_END);
lseek (ok , 0 , SEEK_SET);
buffer2 = (char
) malloc (sizeof(char)lSize);
if (buffer == NULL)
{
fputs (“erreur memoire”,stderr);
exit (2);
}
ok = read (ok,buffer2,lSize);
if(ok != lSize)
{
perror(“read”);
exit (3);
}
for (i = 0; i < 16; i++) {
for(int w=0;w<(1024);w++)
{
buffer[w]=buffer2[w+1024
i];
//printf("%x.",buffer[w]);
}
frames = snd_pcm_writei(handle, buffer, sizeof(buffer));
if (frames < 0)
frames = snd_pcm_recover(handle, frames, 0);
if (frames < 0) {
printf(“snd_pcm_writei failed: %s\n”, snd_strerror(err));
break;
}
if (frames > 0 && frames < (long)sizeof(buffer))
printf(“Short write (expected %li, wrote %li)\n”, (long)sizeof(buffer), frames);
}
snd_pcm_close(handle);
return 0;
}

Could you help me or could you send me a example with a wav file?
ps:
file …/…/BeagleBone/balle_32.wav
…/…/BeagleBone/balle_32.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 32000 Hz

thank you