Re: bluez 3.23 "cannot open libasound_module_pcm_bluetooth.so" issue on A2DP

Problem solved.

from bluez 3.23 on ,  librt.so  is required .


But there's no related error information when i used "aplay -D bluetooth".

So i used strace and found why this "cannot open libasound_module_pcm_bluetooth.so" error happened.






> From: [email protected]
> To: [email protected]
> Date: Tue, 11 Dec 2007 02:57:16 +0000
> Subject: Re: [Bluez-users] bluez 3.23 "cannot open libasound_module_pcm_bluetooth.so" issue on A2DP
>
>
> Hi :
> I have to say i made a mistake in my former statement ;-) . Sorry for the inconvience...
>
> The situation is like this :
>
> 1.the prefix of bluez and alsa are both /bluetooth.
> 2. Im using an embeded system which is running on NFS from my host computer. And "/bluetooth" is on my host computer and is the installation directory after i cross-compiled packeges like bluez/alsa. The NFS on the host computer is actually "/work/rootfs" . So everytime i "make install " the stuff into /bluetooth , i also have to copy things in /bluetooth into /work/rootfs so that my embeded system could use it as NFS.
> 3. From my embeded system's point of view: After it mounted on NFS provided by the host computer, the libasound_module_pcm_bluetooth.so is actually right there in /lib/alsa-lib. And binaries like aplay is in /bin. I also created a directory of /bluetooth and put some links into it . Like this:
>
> /bluetooth $ ls -l
> lrwxrwxrwx 1 root root 4 Nov 12 2007 etc -> /etc
> lrwxrwxrwx 1 root root 4 Nov 12 2007 lib -> /lib
> lrwxrwxrwx 1 root root 6 Nov 12 2007 share -> /share
> lrwxrwxrwx 1 root root 4 Nov 12 2007 usr -> /usr
> lrwxrwxrwx 1 root root 4 Nov 12 2007 var -> /var
>
> The reason im doing this is applications like aplay tends to search its plugin libararies like libasound_module_pcm_bluetooth.so in /bluetooth/lib/alsa-lib..
>
> This method work fine before 3.23...
> In 3.23, aplay turns out to say:
> "Cannot open shared library /bluetooth//lib/alsa-lib/libasound_module_pcm_bluetooth.so"
>
> Actually , maybe there's another clue. If I replaced libasound_module_pcm_bluetooth.so with libraries of an older version like 3.22 in the same directory , the aplay no longer reports a "Cannot open shared library" error when i use aplay -D bluetooth. Although A2DP still can't work cause the version of the plugin lib is not right.
>
>
> Anyway, sorry for any misunderstanding i caused.
> Could someone tell me what should i do now?
>
>
>
> Thanks
>
>
> semiyd
>
>
>
>
>> Date: Mon, 10 Dec 2007 10:22:01 -0300
>> From: [email protected]
>> To: [email protected]
>> Subject: Re: [Bluez-users] bluez 3.23 "cannot open libasound_module_pcm_bluetooth.so" issue on A2DP
>>
>> On Dec 10, 2007 12:03 AM, wrote:
>>>
>>> Hi all:
>>>
>>> I just upgraded my bluez from 3.22 to 3.23.
>>> My ./configure param is like this:
>>> bluez-libs-3.23:
>>> ./configure --host=arm-linux --prefix=/bluetooth
>>> bluez-utils-3.23:
>>> ./configure --host=arm-linux --prefix=/bluetooth/ --enable-test --enable-usb --enable-input --enable-serial --enable-initscripts --enable-bccmd --enable-cups --disable-pcmia --enable-alsa --enable-audio --enable-shared PKG_CONFIG=pkg-config --enable-obex --enable-avctrl --enable-network --enable-debug
>>>
>>> A2DP works fine on 3.22.But I got the following error when i tried to play a2dp using "aplay -D bluetooth" in the 3.23:
>>>
>>> / $ aplay -D bluetooth /tmp/1.wav
>>> ALSA lib pcm.c:2106:(snd_pcm_open_conf) Cannot open shared library /bluetooth//lib/alsa-lib/libasound_module_pcm_bluetooth.so
>>> aplay: main:546: audio open error: No such file or directory
>>>
>>>
>>> BTW, my "libasound_module_pcm_bluetooth.so" is always in /bluetooth/lib/alsa-lib , not /lib/alsa-lib . Because my '--prefix' is /bluetooth.
>>>
>>> Is there anything wrong in my param of ./configure ? Or something else is causing the issue?
>>
>> Installing in /bluetooth/lib/alsa-lib will not going to work, the same
>> applies to gstreamer plugin it must be installed in the prefix that
>> the application will load its plugins. You can either install the alsa
>> and gstreamer binaries in /bluetooth or change your prefix.
>>
>>
>> --
>> Luiz Augusto von Dentz
>> Engenheiro de Computação
>>
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