On Di, Sep 01 2009, Takashi Iwai wrote:
> At best, we need a small C code that reproduces the behavior.
Ok here is a small example.
It's a modified version of pcm_min.c.
Simply press ctrl+c to reproduce the problematic behaviour.
on my machine it takes about an half sek to stop with an usb head which
uses dmix.
Using an sblive card (without dmix) stopps immediately.
/*
* This extra small demo sends a random samples to your speakers.
*/
#include <alsa/asoundlib.h>
#include <signal.h>
#include <unistd.h>
static char *device = "default";
snd_output_t *output = NULL;
unsigned char buffer[16 * 1024]; /* some random data */
snd_pcm_t *handle;
void suspend (int signum)
{
int err;
printf ("trying to stop\n");
if ((err = snd_pcm_drop (handle)) < 0)
printf ("cannot pause\n");
sleep (1);
snd_pcm_close (handle);
exit (1);
}
int main (void)
{
int err;
unsigned int i;
snd_pcm_sframes_t frames;
signal (SIGINT, suspend);
for (i = 0; i < sizeof (buffer); i++)
buffer[i] = random () & 0xff;
if ((err = snd_pcm_open (&handle, device, 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, 48000, 1, 500000)) < 0)
{ /* 0.5sec */
printf ("Playback open error: %s\n", snd_strerror (err));
exit (EXIT_FAILURE);
}
for (i = 0; i < 16; i++)
{
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;
}
Hope you can help.
Kind regards
Halim
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