module Media.Streaming.GStreamer.Core.MiniHierarchy (
module Media.Streaming.GStreamer.Core.MiniHierarchyBase,
Buffer(Buffer), BufferClass,
toBuffer,
mkBuffer, unBuffer,
castToBuffer, gTypeBuffer,
Event(Event), EventClass,
toEvent,
mkEvent, unEvent,
castToEvent, gTypeEvent,
Message(Message), MessageClass,
toMessage,
mkMessage, unMessage,
castToMessage, gTypeMessage,
Query(Query), QueryClass,
toQuery,
mkQuery, unQuery,
castToQuery, gTypeQuery
) where
import Foreign.ForeignPtr (ForeignPtr, castForeignPtr)
import Foreign.ForeignPtr.Unsafe (unsafeForeignPtrToPtr)
import Foreign.C.Types (CULong(..), CUInt(..), CULLong(..))
import System.Glib.GType (GType, typeInstanceIsA)
import Media.Streaming.GStreamer.Core.MiniHierarchyBase
castTo :: (MiniObjectClass obj, MiniObjectClass obj') => GType -> String
-> (obj -> obj')
castTo gtype objTypeName obj =
case toMiniObject obj of
gobj@(MiniObject objFPtr)
| typeInstanceIsA ((unsafeForeignPtrToPtr.castForeignPtr) objFPtr) gtype
-> unsafeCastMiniObject gobj
| otherwise -> error $ "Cannot cast object to " ++ objTypeName
newtype Buffer = Buffer (ForeignPtr (Buffer)) deriving (Eq,Ord)
mkBuffer = (Buffer, miniObjectUnref)
unBuffer (Buffer o) = o
class MiniObjectClass o => BufferClass o
toBuffer :: BufferClass o => o -> Buffer
toBuffer = unsafeCastMiniObject . toMiniObject
instance BufferClass Buffer
instance MiniObjectClass Buffer where
toMiniObject = MiniObject . castForeignPtr . unBuffer
unsafeCastMiniObject = Buffer . castForeignPtr . unMiniObject
castToBuffer :: MiniObjectClass obj => obj -> Buffer
castToBuffer = castTo gTypeBuffer "Buffer"
gTypeBuffer :: GType
gTypeBuffer =
gst_buffer_get_type
newtype Event = Event (ForeignPtr (Event)) deriving (Eq,Ord)
mkEvent = (Event, miniObjectUnref)
unEvent (Event o) = o
class MiniObjectClass o => EventClass o
toEvent :: EventClass o => o -> Event
toEvent = unsafeCastMiniObject . toMiniObject
instance EventClass Event
instance MiniObjectClass Event where
toMiniObject = MiniObject . castForeignPtr . unEvent
unsafeCastMiniObject = Event . castForeignPtr . unMiniObject
castToEvent :: MiniObjectClass obj => obj -> Event
castToEvent = castTo gTypeEvent "Event"
gTypeEvent :: GType
gTypeEvent =
gst_event_get_type
newtype Message = Message (ForeignPtr (Message)) deriving (Eq,Ord)
mkMessage = (Message, miniObjectUnref)
unMessage (Message o) = o
class MiniObjectClass o => MessageClass o
toMessage :: MessageClass o => o -> Message
toMessage = unsafeCastMiniObject . toMiniObject
instance MessageClass Message
instance MiniObjectClass Message where
toMiniObject = MiniObject . castForeignPtr . unMessage
unsafeCastMiniObject = Message . castForeignPtr . unMiniObject
castToMessage :: MiniObjectClass obj => obj -> Message
castToMessage = castTo gTypeMessage "Message"
gTypeMessage :: GType
gTypeMessage =
gst_message_get_type
newtype Query = Query (ForeignPtr (Query)) deriving (Eq,Ord)
mkQuery = (Query, miniObjectUnref)
unQuery (Query o) = o
class MiniObjectClass o => QueryClass o
toQuery :: QueryClass o => o -> Query
toQuery = unsafeCastMiniObject . toMiniObject
instance QueryClass Query
instance MiniObjectClass Query where
toMiniObject = MiniObject . castForeignPtr . unQuery
unsafeCastMiniObject = Query . castForeignPtr . unMiniObject
castToQuery :: MiniObjectClass obj => obj -> Query
castToQuery = castTo gTypeQuery "Query"
gTypeQuery :: GType
gTypeQuery =
gst_query_get_type
foreign import ccall unsafe "gst_buffer_get_type"
gst_buffer_get_type :: CULong
foreign import ccall unsafe "gst_event_get_type"
gst_event_get_type :: CULong
foreign import ccall unsafe "gst_message_get_type"
gst_message_get_type :: CULong
foreign import ccall unsafe "gst_query_get_type"
gst_query_get_type :: CULong