[Bug 711211] avfvideosrc: use input device formats to set/get caps instead of session presets

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=711211
  GStreamer | gst-plugins-bad | git

--- Comment #4 from Andoni Morales <ylatuya at gmail.com> 2013-11-05 16:00:35 UTC ---
Review of attachment 258929:
 --> (https://bugzilla.gnome.org/review?bug=711211&attachment=258929)

::: sys/applemedia/avfvideosrc.m
@@ +351,3 @@
+              found_framerate = TRUE;
+              device.activeVideoMinFrameDuration = rate.minFrameDuration;
+              device.activeVideoMaxFrameDuration = rate.maxFrameDuration;

This API is only available in OS X 10.9 and IOS 7.0, so you should these
property using key-value coding [1] either with try catch or with runtime
detection of the current version [2]

[1]
https://developer.apple.com/library/mac/documentation/cocoa/reference/foundation/Protocols/NSKeyValueCoding_Protocol/Reference/Reference.html#//apple_ref/occ/instm/NSObject/setValue:forKey:

[2]
https://developer.apple.com/library/mac/documentation/developertools/conceptual/cross_development/Using/using.html

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