Missed order of NALUnit.

[awen190418]

At

RTPPlayer-iOS/RTPPlayer/Video/AVCDefragmenter.swift

Line 40 in 37d97d3

self.delegate?.didReceiveNALUnit(nalu)

we are releasing Single NAL Unit before releasing the accumulated FU Fragments. Lets consider following example:

Let us consider the following NAL fragments. A integer in the first box means a id and other other box contains the type of NAL Unit. -> refers to the next NALUnit that was received.

| 22 |FU Unit........ | -> | 23 |FU Unit .......... | -> | 24 |FU Unit .......... | -> | 25 | Single NAL Unit .......... | ->| 26 |FU Unit .......... | -> | 27 |FU Unit .......... | ......

In above NALUnit fragments from 22 to 24 will be in a buffer. Then fragment with id 25 arrives but it gets released before releasing the previous NALUnits. I guess this causes some more scratches in the decoded video.

Therefore, How about releasing the previous buffer before releasing the single unit to decoder ?
How about adding

if fragment.isEndUnit{
           didAssembleFU(&fragmentedNALU!)//Send the portion of data that we have collected so far in the past.
           fragmentedNALU = nil
       }

at

RTPPlayer-iOS/RTPPlayer/Video/VideoDefragmenter.swift

Line 49 in 37d97d3

Thanks