[gst-devel] dynamically remove custom branch from tee and videomixer

[kaija]

anyone help?


kaija wrote:
> 
> I try to create a picture in picture channel to the main pipeline.
> I read this post and succeeded to create PIP channel dynamically.
> (http://gstreamer-devel.966125.n4.nabble.com/Dynamically-adding-and-removing-branches-of-a-tee-td973635.html#a973637)
> However, while I attempt to release the PIP channel while the main
> pipeline is still running, the main pipeline stops to refresh video
> frames.
> I cannot figure out the reason why main pipeline stops.
> Could anyone help me to solve the problem?
> 
> Here is my pipeline looks like:
> 
> 
>    / (main pipeline)queue - videomixer - videoscale - videocrop - caps -
> videosink
> tee                                                                                                                                      
> /
>    \ (pip branch )  queue - videoscale - videocrop - caps ------ mix
> -----/
> 
> 
> the following code shows how I unlink pip branch from tee and videomixer
> 
> void CPiPChannel::Unlink(void) {
> 	gst_pad_set_blocked_async(m_pVideoTeeSrcPad, TRUE, (GstPadBlockCallback)
> PadBlockHandler, m_pVideoTee);
> 	gst_element_remove_pad(m_pVideoMixer, m_pVideoMixerSinkPad);
> }
> 
> void CPiPChannel::PadBlockHandler(GstPad* pPad, gboolean bBlocked,
> gpointer pData)
> {
> 	GstPad* pPeer = NULL;
> 	GstEvent* pEvent = NULL;
> 	GstElement* pTee = NULL;
> 
> 	if(bBlocked) {
> 		pPeer = gst_pad_get_peer(pPad);
> 		pEvent = gst_event_new_eos();
> 		pTee = (CPiPChannel*) pData;
> 
> 		if(gst_pad_unlink(pPad, pPeer);
> 			dprintf("unlink pad success");
> 		else
> 			dprintf("unlink pad failed");
> 
> 		gst_element_set_state(pBin, GST_STATE_READY);
> 		gst_element_set_state(pBin, GST_STATE_NULL);
> 
> 		gst_pad_push_event(pPeer, pEvent);
> 		gst_pad_set_blocked_async(pPad, FALSE, (GstPadBlockCallback)
> PadBlockHandler, pData);
> 		gst_element_remove_pad(pTee, pPad);
> 		gst_object_unref(pPad);
> 	} else {
> 		dprintf("unblocked");
> 	}
> }
> 

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