How to stop the pipeline gstreamer?

[nghung270192]

I'm a newbie of using gstreamer.
My code is used to display preview or next photo when i press button.

code: 
//created pipeline, elements and linked them
......
data.loop = g_main_loop_new (NULL, FALSE);  

 g_object_set (data.filesrc, "location", data.mang[i], NULL); 
// load a photo in folder.i will change, each i, it give different  photo

gst_element_set_state (data.pipeline, GST_STATE_PLAYING); 
g_main_loop_run (data.loop);

so I want to stop this pipeline to go back at starting of code  for i
change. how do i stop pipeline?
Thanks so much. 






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