[vlc-devel] V4L2 & ALSA

[Rafaël Carré]

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Richard Hosking a écrit :
> Ok, I knew I would answer my own question just after
> posting :-)
> 
> I have added:-
> 
>   VLC_ADD_LDFLAGS([v4l2],[-lasound -lm -ldl])
> 
> near the end of the v4l2 section in the configure.ac
> file and all seems to be well.
> 
> I'm not sure if this should have some additional
> checking around it (ie if ALSA support is present).
> 

you can look at --enable-alsa section of configure.ac, if v4l2 test is
located after alsa test, you can just use:

  if test "${have_alsa}" = "true"

if not, move it ;)

> Richard.
> 
> Richard Hosking wrote:
>> I am currently in the process of finishing the V4L2
>> (Video 4 Linux 2) driver in VLC on Linux.
>>
>> I am doing this as I have a capture card which only
>> supports the newer V4L2 spec... hence me completing
>> the work.  The video capture side of things is complete.
>>
>> For audio, as well as legacy OSS support I need to
>> implement ALSA input capture support.  I see VLC uses
>> ALSA code elsewhere (ie for audio output).
>>
>> My test ALSA code in the v4l2.c file builds correctly, but
>> VLC moans at startup....
>>
>>   cannot load module `modules/access/.libs/libv4l2_plugin.so'
>>   (modules/access/.libs/libv4l2_plugin.so: undefined symbol:
>>   snd_pcm_close)
>>
>> what do I need to do to my build so the library knows
>> about the ALSA stuff?  My knowledge of the make system in
>> VLC is non existent!
>>
>> Cheers,
>> Richard (hovis)
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>>
>>
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- --
Rafaël Carré
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