How to dynamically link a sound to audiomixer plugin ?

[toub]

Hi all,
I'm developing an app which mixes wav streams together, using the audiomixer
plugin.
I got an issue regarding dynamic linking of new filesrc elements to a
playing audiomixer element.

So far, what I do is :
-  start a pipeline with only audiomixer->volume->audioconvert->alsasink
elements and put it in playing mode
- as soon as an event requesting sound streaming raises, I :
  - instantiate new sound elements : filesrc->wavparse->audioconvert->pitch,
gathered in a bin
  - link this bin to audiomixer, with a request pad retrieved by 
gst_element_request_pad(audiomixer,
gst_element_class_get_pad_template(GST_ELEMENT_GET_CLASS(audiomixer),
"sink_%u"), NULL, NULL);
  - retrieve running time : 
gst_clock_get_time(gst_element_get_clock(pipeline)) -
gst_element_get_base_time(pipeline);
  - apply running time as an offset on mixer sinkpad, so that new sound will
start from its beginning : 
g_object_set(mixerSinkPad, "offset", RunningTime, NULL);
  - put sound bin in playing mode

It works fine for first sound (when running time is at 0, no offset is
applied). However, if I trigger a new sound (before previous sound is ended,
hence before EOS is raised on bus), its beginning is truncated. I've tried
to apply a greater offset, with same result. I've also tried to pause
audiomixer or previous sound's bin before adding new sound, it does'nt
change anything.

Any Idea ?




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