[Bug 732203] h264parse: improve handling of byte-stream/au format

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732203
  GStreamer | gst-plugins-bad | git

--- Comment #4 from Gwenole Beauchesne <gb.devel at gmail.com> 2014-06-25 11:56:01 UTC ---
Created an attachment (id=279218)
 View: https://bugzilla.gnome.org/attachment.cgi?id=279218
 Review: https://bugzilla.gnome.org/review?bug=732203&attachment=279218

h264parse: improve conditions for skipping NAL unit

Carefully track cases when skipping broken or invalid NAL units is necessary.
In particular, always allow NAL units to be processed and let that
gst_h264_parse_process_nal() function decide on whether the current NAL needs
to be dropped or not.

This fixes parsing of streams with SEI NAL buffering_period() message inserted
between SPS and PPS, or SPS-Ext NAL following a traditional SPS NAL unit, among
other cases too.

Practical examples include from H.264 AVC conformance suite include
alphaconformanceG, CVSE2_Sony_B, CVSE3_Sony_H, CVSEFDFT3_Sony_E when parsing in
stream-format=byte-stream,alignment=au mode.

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