hello everone.
i am now debuging the multi-channel device on my embeded board with
alsa-lib.The version alsa-driver and alsa-lib is 1.0.24.
----------------------------->
zz@board:$ ls /dev/snd/
by-path controlC0 midiC0D0 pcmC0D0c pcmC0D0p pcmC0D1p seq timer
<---------------------------
i edit the asoundrc configure file.like this:
--------------------------------------------------->
pcm.!default{
type hw
card 0
}
ctl.!default{
type hw
card 0
}
#################################
## create a virtul device which has 4 channels for playback.
#################################
pcm.multi_playback{
type multi;
slaves.a.pcm "hw:0,0";
slaves.a.channels 2;
slaves.b.pcm "hw:0,1";
slaves.b.channels 2;
bindings.0.slave a;
bindings.0.channel 0;
bindings.1.slave a;
bindings.1.channel 1;
bindings.2.slave b;
bindings.2.channel 0;
bindings.3.slave b;
bindings.3.channel 1;
}
ctl.multi_playback{
type hw;
card 0;
}
pcm.ttable{
type route;
slave.pcm "multi_playback";
slave.channels 4;
ttable.0.0 1;
ttable.1.1 1;
ttable.2.2 1;
ttable.3.3 1;
}
ctl.ttable {
type hw;
card 0;
}
<--------------------------------------------------
and then get the Segmentation fault:
-------------------------------------------------------------->
[root@board /tmp]#./pb_pcm_min
open...ver:[0.71]
playback...capture...device=[multi_playback]
#####################snd_pcm_open...
zz[snd_dlsym_verify:122],vname=[_snd_config_hook_load_dlsym_config_hook_
001]
zz[snd_dlsym_verify:127]
zz[snd_dlsym:167]
zz[snd_dlsym:171],name=[snd_config_hook_load]
zz[snd_pcm_open_conf:2163]
zz[snd_dlsym_verify:122],vname=[__snd_pcm_multi_open_dlsym_pcm_001]
Segmentation fault
[root@board /tmp]#
<---------------------------------------------------------------
To my surpris, it will be fine when run on the PC under the Ubuntu
system.I used the same alsa-lib source code and the configure file
asoundrc.
in my codec-driver .i have not call the functions
:snd_soc_add_controls() / snd_soc_dapm_new_controls() /
snd_soc_dapm_add_routes(). is it the reason? But the programm have not
arrived here.
i have traced the source code when the Segmentation fault happened the
alsa-lib was calling the function dlysm() with the param
vname=__snd_pcm_multi_open_dlsym_pcm_001. But this will not happen on my
PC under Ubuntu. could you help me find out what's wrong with me?
thanks a lot.
zw
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