Just to add:
(yes I know I didn't free the hwparams structure, but it is done in the
rest of the code I cut)
the "speaker" device is virtual, generated with dmix on asound.conf:
pcm.pcm1774 {
type hw
card 0
}
ctl.pcm1774 {
type hw
card 0
}
pcm.buzzer {
type dshare
ipc_key 6678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
buffer_size 16384
period_time 2
period_size 1024
}
bindings {
0 0
}
}
pcm.speaker {
type dshare
ipc_key 6678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
buffer_size 16384
period_time 2
period_size 1024
}
bindings {
0 1
}
}
Fortini Matteo ha scritto:
> Hi,
> I'm experiencing a very strange behavior.
>
> I'm using alsa 1.0.18 on a powerpc platform.
>
> If I run the following simple code from the main of a .c file, it works
> perfectly, but if I put into a shared .so library (libaudio.so), then I
> link the main with -laudio -lasound, then the hwparams structure is not
> filled with anything, while the alsa functions don't return any error.
>
> Do you have any clue why this could happen?
>
> TIA
>
> ############################################################
> int play_sample(char *pcm_name, char *samplename)
> {
> int res;
> snd_pcm_t *pcm_handle;
> snd_pcm_hw_params_t *hwparams;
> const char *name= (pcm_name != NULL) ? pcm_name : "speaker";
>
> if ( (res = snd_pcm_open(&pcm_handle, name, SND_PCM_STREAM_PLAYBACK,
> 0)) < 0) {
> fprintf(stderr, "Error opening PCM device %s\n", pcm_name);
> return 1;
> } else {
> printf ("snd_pcm_open returned %d\n", res);
> }
>
>
> snd_pcm_hw_params_malloc(&hwparams);
> if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) {
> fprintf(stderr, "Can not configure this PCM device.\n");
> return 1;
>
> snd_pcm_close(pcm_handle);
> }
>
>
> int main (void)
> {
> play_sample (NULL, "test_sound.wav);
>
> return 0;
> }
> ############################################################
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@xxxxxxxxxxxxxxxx
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>
>
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