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GstFlagSet is a new type designed for negotiating sets of boolean capabilities flags, consisting of a 32-bit flags bitfield and 32-bit mask field. The mask field indicates which of the flags bits an element needs to have as specific values, and which it doesn't care about. This allows efficient negotiation of arrays of boolean capabilities. The standard serialisation format is FLAGS:MASK, with flags and mask fields expressed in hexadecimal, however GstFlagSet has a gst_register_flagset() function, which associates a new GstFlagSet derived type with an existing GFlags gtype. When serializing a GstFlagSet with an associated set of GFlags, it also serializes a human-readable form of the flags for easier debugging. It is possible to parse a GFlags style serialisation of a flagset, without the hex portion on the front. ie, +flag1/flag2/flag3+flag4, to indicate that flag1 & flag4 must be set, and flag2/flag3 must be unset, and any other flags are don't-care. https://bugzilla.gnome.org/show_bug.cgi?id=746373 |
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