You solved my problem. I made some changes to the program, I now know that
the problem was not the small buffer. It's all working perfect. I got
the segmentation
fault. It plays it receives on stdin. I send you the program as an
attachment.
2012/4/11 Torsten Schenk <torsten.sch...@zoho.com>
> Hello Fabio,
>
> > snd_pcm_writei (playback_handle, p, 131072)
> writes 131072 FRAMES
>
> > p += 131072
> increases the pointer by 131072 SAMPLES.
>
> If you write
> p += 131072 * number_of_channels
> instead, your program should do the job.
>
> Greets,
> Torsten
>
>
#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>
#define BUFFER 128
int main (int argc, char *argv[])
{
int err;
short buf[BUFFER*2];
int rate = 44100;
snd_pcm_t *playback_handle;
snd_pcm_hw_params_t *hw_params;
char* out;
if( argc <= 1 )
out = "default";
else
out = argv[1];
if ((err = snd_pcm_open (&playback_handle, out, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
fprintf (stderr, "cannot open audio device %s (%s)\n",
argv[1],
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_any (playback_handle, hw_params)) < 0) {
fprintf (stderr, "cannot initialize hardware parameter structure (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_set_access (playback_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
fprintf (stderr, "cannot set access type (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_set_format (playback_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
fprintf (stderr, "cannot set sample format (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_set_rate_near (playback_handle, hw_params, &rate, 0)) < 0) {
fprintf (stderr, "cannot set sample rate (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_set_channels (playback_handle, hw_params, 2)) < 0) {
fprintf (stderr, "cannot set channel count (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params (playback_handle, hw_params)) < 0) {
fprintf (stderr, "cannot set parameters (%s)\n",
snd_strerror (err));
exit (1);
}
snd_pcm_hw_params_free (hw_params);
if ((err = snd_pcm_prepare (playback_handle)) < 0) {
fprintf (stderr, "cannot prepare audio interface for use (%s)\n",
snd_strerror (err));
exit (1);
}
while( !feof(stdin) ) {
fread( &buf, 1, BUFFER * sizeof(short) * 2, stdin );
if ((err = snd_pcm_writei (playback_handle, &buf, BUFFER)) != BUFFER) {
fprintf (stderr, "write to audio interface failed (%s)\n",
snd_strerror (err));
exit (1);
}
}
snd_pcm_close (playback_handle);
exit (0);
}
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