I have an application that sends a video stream to a client over a custom protocol. When the client first connects, we need to wait until the next keyframe so the client can decode it sensibly. Alternatively, the client could read a flag in the protocol and wait for a keyframe on its end. Either way, we need to check the GstBuffer flags for a keyframe.
The C code to do this would be:
if(!GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT)) {
// it's a keyframe
}
GstBufferFlags is itself an enum. The issue is that GST_BUFFER_FLAG_IS_SET() is itself a C macro rather than a straight function. So is GST_BUFFER_FLAGS(). There doesn't seem to be any other mechanisim in GstBuffer for checking the flags. I'm not sure how the introspection bindings would have picked up the macros.
