[pulseaudio-discuss] userdata not being relayed in callback method

Colin Guthrie gmane at colin.guthr.ie
Wed Oct 14 00:28:33 PDT 2009

'Twas brillig, and Forwind info at 13/10/09 22:36 did gyre and gimble:
> Hi folks,
> I have made considerable progress from earlier on. I have almost 
> completed my task but it looks as if there may be a bug or more than 
> likely I'm being a bit stupid ?
> I'm on on Jaunty.
> Scenario:
> On a PA_SUBSCRIPTION_EVENT_SINK_INPUT my subscription callback method is 
> called with the relevant userdata obj which was passed in at the main 
> method stage. All fine so far.
> After receiving this event, I then call
> pa_context_get_sink_input_info(c, index, 
> context_get_sink_input_info_callback, userdata));  //please note  at 
> this point the userdata obj is as it should be.
> But when the callback is called the userdata obj is NULL !
> Any ideas ?
> Code is pasted below

The functions themselves look OK, but it's entirely possible 
context_get_sink_input_info_callback() is used/called elsewhere too.

The error messages you print out are identical by the way... which may 
lead to strange debug info.

I'd also try your app on a newer PA as .14 is quite old and was a bit of 
a short lived release anyway, .15 was more of a long term release. That 
said, I don't remember any specific commits claiming to fix callback 
userdata, but that said, I've not read *every* commit and my memory is 
not *always* reliable anyway :p



Colin Guthrie

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