How to dynamically change filesrc location and gapless playback and loop using C

[imoni]

I'm trying to make an application that plays gapless and loops with  C.

AAA.mp4--> BBB.mp4--> CCC.mp4--> AAA.mp4--> BBB.mp4--> CCC.mp4--> ...

There are a few things I don't understand.

How to dynamically change the next filesrc after playing the first filesrc?
How to dynamically play the next filesrc with gapless?
How to dynamically loop play?
Is it difficult for a beginner to understand these and make an application?

I tried to change the src element for reference Changing elements in a
pipeline
(https://gstreamer.freedesktop.org/documentation/application-development/advanced/pipeline-manipulation.html?gi-language=c#dynamically-changing-the-pipeline), 
but it failed. In this example, since it is a filter element, I don't know
what to do in case of src element.



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