[Bug 739992] h264parse: expose compatible profiles to downstream

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739992
  GStreamer | gst-plugins-bad | git

--- Comment #2 from Gwenole Beauchesne <gb.devel at gmail.com> 2014-11-14 15:25:15 UTC ---
I think we can do simpler, with approach 4:

4.a. Keep gst_codec_utils_h264_caps_set_level_and_profile() as is to maintain
API and ABI compatibility ;

4.b. Add new helper functions, e.g. gst_codec_utils_h264_get_profile_name(),
gst_codec_utils_h264_get_level_name() to return a string representation of the
supplied profile_idc and level_idc values.

4.c. If we can derive compatible profiles for src pad caps, I think we could
simply gst_structure_copy() the "native" caps, and replace "profile" to the
compatible one we determined.

4.d. Then, we could simply append compatible structures and ultimately
gst_caps_simplify() the result to have a clean representation with
profile={multiview-high, stereo-high, high} (as an example).

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