Adding the config data before each frame's raw data seems to be a
common usage. Usually aac audio codec (SW/HW) can accept it as the
input because there are not only aac audio tracks in file container
like mp4 but also *.aac files alone. And in a *.aac file, there are
always such config data before each frame. A codec is supposed to
support both of this.
So it's natual for a MP4 parser to output aac data with this config
bytes prepending. And so the codec components need not to know whether
its preceding peer is a mp4 parser or just a file souce for an aac
file.
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