dynamically audio elements remove issue

[Leslie Li]

Hi all,

I have a pipeline like this:

v4l2src->caps->h264enc->v_tee->
                                                           qtmux->filesink
alsasrc->queue->caps->faac->a_tee->

I have set an event_probe on qtmux src pad, if I press stop button on ui, I
will do the following stuff:

1. send eos on qtmux video_00 and audio_00 sink pads
2. then received a event in event_probe callback, in the callback, I unlink
v_tee src0 pad from video_00,
    remove v_tee src0; unlink a_tee src0 from audio_00, remove a_tee src0;
remove event_probe of qtmux src pad
    then generate an application message, to wake up application thread
3. in application thread, after done step 1, I use a gst_bus_poll on
pipeline bus to wait for a application message 
     coming, after get the message, I set qtmux and filesink to NULL state,
then remove them from pipeline;
     set pipeline state to PAUSED,
     set v_tee, h264enc... video elements to NULL state, then remove them
out of pipeline;
     set a_tee, alsasrc...audio elements to NULL state, before this step, I
have checked that v_tee and a_tee  
     have none src pad on it, but, sometimes, the application thread will
block forever if I do 
     gst_element_set_state(alsasrc, GST_STATE_NULL), the same thing happens
on a_tee or any element in audio 
     path, but video path are always ok and never get any blocking. This
happens only sometimes, I guess that the
     time I press stop button, the alsa path maybe in some special state, so
it will block.

my requirement is to make up a multitask pipeline, and it can split
video/audio encoded stream into rtp and/or qtmux on demand, after talking
with nice guys in IRC for days, I got the above solution, but the audio path
seems still having problem with it, any suggestion will be very appreciated,
and if there is another more effective and reasonable solution, that will be
great.

Leslie


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