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RE: [Linphone-developers] Linphone customisation


From: Simon Morlat
Subject: RE: [Linphone-developers] Linphone customisation
Date: Thu, 03 Dec 2009 13:52:42 +0100

Sounds like it could not find a libmslisgw_init() function in your
plugin.
If you used C++, don't forget to prepend this function with extern "C".

Simon

Le jeudi 03 décembre 2009 à 12:43 +0000, M Walton a écrit :
> Hi Simon,
> 
> Thanks for the quick response! im getting closer...
> 
> So now i understand, its /usr/lib/mediastreamer/plugins
> 
> so i have added a few printf's in and around the ms_load_plugins function, 
> one to print the search path and the other to print the files it finds
> 
> my file is called libmslisgw.so
> 
> so if i run linphonec i get my debug strings...
> 
> It finds my file - but doesnt seem to do anything with it, i thinks it 
> failing on the strstr calls, possibly the PLUGINS_EXT bit?
> 
> root:/usr/lib/mediastreamer/plugins> linphonec
> NLS disabled.
> .
> .
> .
> ALSA lib ../../../alsa-lib-1.0.18/src/pcm/pcm_hw.c:1429:(_snd_pcm_hw_open) 
> Inval
> id value for card
> ALSA lib ../../../alsa-lib-1.0.18/src/pcm/pcm_hw.c:1429:(_snd_pcm_hw_open) 
> Inval
> id value for card
> opening directory /usr/lib/mediastreamer/plugins
> Found .
> Found ..
> Found libmslisgw.so
> opening directory /usr/lib/liblinphone/plugins
> Ready
> Warning: video is disabled in linphonec, use -V or -C or -D to enable.
> linphonec> soundcard list
> 0: ALSA: default device
> 1: OSS: /dev/dsp
> 2: OSS: /dev/dsp1
> linphonec>
> 
> -----Original Message-----
> From: Simon Morlat [mailto:address@hidden 
> Sent: 03 December 2009 11:44 AM
> To: M Walton
> Cc: address@hidden
> Subject: RE: [Linphone-developers] Linphone customisation
> 
> Le jeudi 03 décembre 2009 à 10:59 +0000, M Walton a écrit :
> > Hi Simon,
> > 
> > I have managed to create and build the plugin, however, i have a few 
> > questions that i think are preventing it from working:
> > 
> > 1) When you say "The plugin must be installed in 
> > $prefix/lib/mediastreamer/plugins/" - what do you mean by $prefix? i have 
> > installed it into /lib/mediastreamer/plugins - but it doesnt seem to get 
> > detected.
> > 
> > Do you mean $linphonec-dir$/libs/mediastreamer/plugins?
> > 
> > Also, is the directory /libs/mediastreamer not /libs/mediastreamer2?
> 
> by $prefix I meant the installation prefix (usually /usr or /usr/local),
> when you do 'make install' in linphone.
> thus the plugin should be in 
> /usr/local/lib/mediastreamer/plugins/
> if you configured linphone with --prefix=/usr it will be in
> /usr/lib/mediastreamer/plugins/
> 
> > 
> > 2) Do i need to register the soundcard AND the two filters? or just the 
> > soundcard which will in turn register the associated filters?
> > 
> > void liblisgw_init(void){
> >     ms_snd_card_manager_register_desc(ms_snd_card_manager_get(), 
> > &lismore_card_desc);
> >     ms_filter_register(&lismore_write_desc);
> >     ms_filter_register(&lismore_read_desc);
> > }
> 
> No need to register the filter if they are instanciated with
> ms_filter_new_from_desc (it is only necessary when using ms_filter_new
> or ms_filter_new_from_name ).
> 
> > 
> > 3) do i still need the following two export entries now its not being 
> > statically linked?
> > 
> > MS_FILTER_DESC_EXPORT(lismore_write_desc);
> > and
> > MS_FILTER_DESC_EXPORT(lismore_read_desc);
> 
> The MS_FILTER_DESC_EXPORT is empty, it's just a marker for an awk script
> in mediastreamer2/src/Makefile.am to collect all descs and automatically
> generate a header file with them.
> 
> > 
> > 4) The ID change is now MS_FILTER_PLUGIN_ID for both the read and write 
> > structs with a category of MS_FILTER_OTHER, is this ok?
> That's ok. Category is just indicating whether the filter is an encoder,
> a decoder, or something else.
> 
> > 
> > Many thanks as always
> you're welcome
> 
> Simon
> 
> 






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