Okay scratch all of the above. Found the issue - no bug - its me of course! It seemed a little too fundamental to be a bug and not raise obvious google hits/IRC alarm bells. I was not strictly adhering to the callback prototype parameter lists. My callback's signature was (pa_context *c, const pa_sink_input_info *info, void *userdata) The prototype in the APi is (pa_context *c, const pa_sink_input_info *info, int eol, void *userdata I missed out on the eol ... <div class="gmail_quote">On Wed, Oct 14, 2009 at 11:29 AM, Forwind info <<a href="mailto:forward@forwind.net">forward@forwind.net</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi Colin<div class="im"> >>The functions themselves look OK, but it's entirely possible >>context_get_sink_input_info_callback() is used/called elsewhere too. </div>Yeah I checked that. Just that one call I'm afriad<div class="im"> >>The error messages you print out are identical by the way... which may lead to strange >>debug info. </div>Sure I should have tidied this before posting. <div class="im"> >>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 </div> Yeah I was hoping to get this to work with 0.9.14 since it ships with Jaunty. Does the upcoming Karmic ship with 0.9.15 ? Conor<div><div></div><div class="h5"> <div class="gmail_quote">On Wed, Oct 14, 2009 at 8:28 AM, Colin Guthrie <<a href="mailto:gmane@colin.guthr.ie" target="_blank">gmane@colin.guthr.ie</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">'Twas brillig, and Forwind info at 13/10/09 22:36 did gyre and gimble:<div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> 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 0.9.1.4 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 </blockquote> </div> 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 Col -- Colin Guthrie gmane(at)<a href="http://colin.guthr.ie" target="_blank">colin.guthr.ie</a> <a href="http://colin.guthr.ie/" target="_blank">http://colin.guthr.ie/</a> Day Job: Tribalogic Limited [<a href="http://www.tribalogic.net/" target="_blank">http://www.tribalogic.net/</a>] Open Source: Mandriva Linux Contributor [<a href="http://www.mandriva.com/" target="_blank">http://www.mandriva.com/</a>] PulseAudio Hacker [<a href="http://www.pulseaudio.org/" target="_blank">http://www.pulseaudio.org/</a>] Trac Hacker [<a href="http://trac.edgewall.org/" target="_blank">http://trac.edgewall.org/</a>] _______________________________________________ pulseaudio-discuss mailing list <a href="mailto:pulseaudio-discuss@mail.0pointer.de" target="_blank">pulseaudio-discuss@mail.0pointer.de</a> <a href="https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss" target="_blank">https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss</a> </blockquote></div> </div></div></blockquote></div>