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RE: [Linphone-developers] Linphone customisation

From: M Walton
Subject: RE: [Linphone-developers] Linphone customisation
Date: Thu, 3 Dec 2009 12:43:52 -0000

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

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 ..
opening directory /usr/lib/liblinphone/plugins
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

-----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 
if you configured linphone with --prefix=/usr it will be in

> 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/ 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


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