[Bug 736213] h264parse: process NAL AU DELIMITER

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=736213

Hyunjun Ko <zzoon at igalia.com> changed:

           What    |Removed                     |Added
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 Attachment #346292|needs-work                  |none
             status|                            |
 Attachment #346292|0                           |1
        is obsolete|                            |

--- Comment #33 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 347370
  --> https://bugzilla.gnome.org/attachment.cgi?id=347370&action=edit
h264parse: insert AU delimiter only in case of byte-stream

Inserts AU delimeter by default if missing au delimeter from upstream.
This should be done only in case of byte-stream format.

Note that:
We have to compensate for the new bytes added for the AU, otherwise
insertion of PPS/SPS will use wrong offsets and overwrite wrong data.

Also mark the AU delimiter blob const, and use frame->out_buffer for 
storing the output to keep baseparse assumptions valid.

-----
I reprepared a patch for handling both alignment of nal and au.
I've unified slomo's patch since I changed the first proposed patch a bit.

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