megaco_binary_transformer_v1.erl

OTP是开放电信平台的简称

        all    -> all;
        choose -> choose;
        Char when integer(Char) -> Char
    end.

%% mediaDescriptor      = MediaToken LBRKT mediaParm *(COMMA mediaParm) RBRKT
%% ; at-most-once per item
%% ; and either streamParm or streamDescriptor but not both
%% mediaParm            = (streamParm / streamDescriptor / 
%%                         terminationStateDescriptor)
%% ; at-most-once
%% streamParm           = ( localDescriptor / remoteDescriptor / 
%%                         localControlDescriptor )
%% streamDescriptor     = StreamToken EQUAL StreamID LBRKT streamParm 
%%                        *(COMMA streamParm) RBRKT
tr_MediaDescriptor(#'MediaDescriptor'{termStateDescr = TermState,
                                      streams        = Streams},
                   State) ->
    #'MediaDescriptor'{termStateDescr = tr_opt_TerminationStateDescriptor(TermState, State),
                       streams        = tr_opt_streams(Streams, State)}.

tr_opt_streams(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_streams({Tag, Val}, State) ->
    Val2 = 
        case Tag of
            oneStream   -> tr_StreamParms(Val, State);
            multiStream -> [tr_StreamDescriptor(SD, State) || SD <- Val]
        end,
    {Tag, Val2}.

tr_StreamParms(#'StreamParms'{localControlDescriptor = Control,
                              localDescriptor        = Local,
                              remoteDescriptor       = Remote},
               State) ->
    #'StreamParms'{localControlDescriptor = tr_opt_LocalControlDescriptor(Control, State),
                   localDescriptor        = tr_opt_LocalRemoteDescriptor(Local, State),
                   remoteDescriptor       = tr_opt_LocalRemoteDescriptor(Remote, State)}.

tr_StreamDescriptor(#'StreamDescriptor'{streamID    = Id,
                                        streamParms = Parms},
                    State) ->
    #'StreamDescriptor'{streamID    = tr_StreamID(Id, State),
                        streamParms = tr_StreamParms(Parms, State)}.

%% localControlDescriptor = LocalControlToken LBRKT localParm 
%%                          *(COMMA localParm) RBRKT
%% 
%% ; at-most-once per item
%% localParm            = ( streamMode / propertyParm /
%%                          reservedValueMode  / reservedGroupMode ) 
%% reservedValueMode       = ReservedValueToken EQUAL ( "ON" / "OFF" ) 
%% reservedGroupMode       = ReservedGroupToken EQUAL ( "ON" / "OFF" ) 
%% 
%% reservedMode      = ReservedToken EQUAL ( "ON" / "OFF" )
%% 
%% streamMode           = ModeToken EQUAL streamModes
tr_opt_LocalControlDescriptor(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_LocalControlDescriptor(#'LocalControlDescriptor'{streamMode    = Mode,
                                                        reserveGroup  = Group,
                                                        reserveValue  = Value,
                                                        propertyParms = Props},
                              State) ->
    #'LocalControlDescriptor'{streamMode    = tr_opt_StreamMode(Mode, State),
                              reserveGroup  = tr_opt_bool(Group, State),
                              reserveValue  = tr_opt_bool(Value, State),
                              propertyParms = [tr_PropertyParm(P, State) || P <- Props]}.

tr_opt_StreamMode(Mode, _State) ->
    case Mode of
        asn1_NOVALUE -> asn1_NOVALUE;
        sendOnly     -> sendOnly;
        recvOnly     -> recvOnly;
        sendRecv     -> sendRecv;
        inactive     -> inactive;
        loopBack     -> loopBack
    end.

tr_Name(Name, State) ->
    %% BUGBUG: transform
    %% BUGBUG: NAME = ALPHA *63(ALPHA / DIGIT / "_" )
    tr_STRING(Name, State, 2, 2).

tr_PkgdName(Name, State) ->
    %% BUGBUG: transform
    %% BUGBUG:  pkgdName =  (NAME / "*")  SLASH  (ItemID / "*" )
    tr_OCTET_STRING(Name, State, 4, 4).

%% When text encoding the protocol, the descriptors consist of session
%% descriptions as defined in SDP (RFC2327), except that the "s=", "t="
%% and "o=" lines are optional. When multiple session descriptions are
%% provided in one descriptor, the "v=" lines are required as delimiters;
%% otherwise they are optional.  Implementations shall accept session
%% descriptions that are fully conformant to RFC2327. When binary
%% encoding the protocol the descriptor consists of groups of properties
%% (tag-value pairs) as specified in Annex C.  Each such group may
%% contain the parameters of a session description.
tr_opt_LocalRemoteDescriptor(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_LocalRemoteDescriptor(#'LocalRemoteDescriptor'{propGrps = Groups},
                             State) ->
    #'LocalRemoteDescriptor'{propGrps = [tr_PropertyGroup(G, State) || G <- Groups]}.

tr_PropertyGroup(Props, State) ->
    [tr_PropertyGroupParm(P, State) || P <- Props].

tr_PropertyGroupParm(#'PropertyParm'{name  = Name,
                                     value = Value},
                     State) ->
    Constraint = fun(Item) -> tr_PkgdName(Item, State) end,
    #'PropertyParm'{name  = resolve(property, Name, State, Constraint),
                    value = tr_OCTET_STRING(Value, State, 0, infinity)}.

tr_PropertyParm(#'PropertyParm'{name      = Name,
                                value     = Value,
                                extraInfo = Extra},
                State) ->
    Constraint = fun(Item) -> tr_PkgdName(Item, State) end,
    #'PropertyParm'{name      = resolve(property, Name, State, Constraint),
                    value     = tr_Value(Value, State),
                    extraInfo = tr_opt_extraInfo(Extra, State)}.

tr_opt_extraInfo(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_extraInfo({relation, Rel}, _State) ->
    Rel2 = 
        case Rel of
            greaterThan -> greaterThan;
            smallerThan -> smallerThan;
            unequalTo   -> unequalTo
        end,
    {relation, Rel2};
tr_opt_extraInfo({range, Range}, State) ->
    Range2 = tr_bool(Range, State),
    {range, Range2};
tr_opt_extraInfo({sublist, Sub}, State) ->
    Sub2 = tr_bool(Sub, State),
    {sublist, Sub2}.

tr_opt_TerminationStateDescriptor(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_TerminationStateDescriptor(#'TerminationStateDescriptor'{propertyParms      = Props,
                                                                eventBufferControl = Control,
                                                                serviceState       = Service},
                                  State) ->
    #'TerminationStateDescriptor'{propertyParms      = [tr_PropertyParm(P, State) || P <- Props],
                                  eventBufferControl = tr_opt_EventBufferControl(Control, State),
                                  serviceState       = tr_opt_ServiceState(Service, State)}.

tr_opt_EventBufferControl(Control, _State) ->
    case Control of
        asn1_NOVALUE -> asn1_NOVALUE;
        off          -> off;
        lockStep     -> lockStep
    end.

tr_opt_ServiceState(Service, _State) ->
    case Service of
        asn1_NOVALUE -> asn1_NOVALUE;
        test         -> test;
        outOfSvc     -> outOfSvc;
        inSvc        -> inSvc
    end.

tr_MuxDescriptor(#'MuxDescriptor'{muxType  = Type,
                                  termList = IdList},
                 State) ->
    #'MuxDescriptor'{muxType  = tr_MuxType(Type, State),
                     termList = [tr_TerminationID(Id, State) || Id <- IdList]}.

tr_MuxType(Type, _State) ->
    case Type of
        h221 -> h221;
        h223 -> h223;
        h226 -> h226;
        v76  -> v76
    end.

tr_opt_StreamID(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_StreamID(Id, State) ->
    tr_StreamID(Id, State).

tr_StreamID(Id, State) ->
    tr_UINT16(Id, State).

tr_EventsDescriptor(#'EventsDescriptor'{requestID = Id,
                                        eventList = Events},
                    State) ->
    #'EventsDescriptor'{requestID = tr_opt_RequestID(Id, State),
                        eventList = [tr_RequestedEvent(E, State) || E <- Events]}.

tr_RequestedEvent(#'RequestedEvent'{pkgdName    = Name,
                                    streamID    = Id,
                                    evParList   = Parms,
                                    eventAction = Actions},
                  State)  ->
    Constraint = fun(Item) -> tr_PkgdName(Item, State) end,
    #'RequestedEvent'{pkgdName    = resolve(event, Name, State, Constraint),
                      streamID    = tr_opt_StreamID(Id, State),
                      eventAction = tr_opt_RequestedActions(Actions, State),
                      evParList   = [tr_EventParameter(P, Name, State) || P <- Parms]}.

tr_opt_RequestedActions(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_RequestedActions(#'RequestedActions'{keepActive        = Keep,
                                            eventDM           = DM,
                                            secondEvent       = Event,
                                            signalsDescriptor = SigDesc},
                        State) ->
    #'RequestedActions'{keepActive        = tr_opt_keepActive(Keep, State),
                        eventDM           = tr_opt_EventDM(DM, State),
                        secondEvent       = tr_opt_SecondEventsDescriptor(Event, State),
                        signalsDescriptor = tr_opt_SignalsDescriptor(SigDesc, State)}.

tr_opt_keepActive(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_keepActive(Keep, State) ->
    tr_bool(Keep, State).

tr_opt_EventDM(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_EventDM({Tag, Val}, State) ->
    Val2 = 
        case Tag of
            digitMapName  -> tr_DigitMapName(Val, State);
            digitMapValue -> tr_DigitMapValue(Val, State)
        end,
    {Tag, Val2}.

tr_opt_SecondEventsDescriptor(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_SecondEventsDescriptor(#'SecondEventsDescriptor'{requestID = Id,
                                                        eventList = Events},
                              State) ->
    #'SecondEventsDescriptor'{requestID = tr_RequestID(Id, State), %% IG v6 6.8 withdrawn
                              eventList = [tr_SecondRequestedEvent(E, State) || E <- Events]}.

tr_SecondRequestedEvent(#'SecondRequestedEvent'{pkgdName    = Name,
                                                streamID    = Id,
                                                evParList   = Parms,
                                                eventAction = Actions},
                        State) ->
    Constraint = fun(Item) -> tr_PkgdName(Item, State) end,
    #'SecondRequestedEvent'{pkgdName    = resolve(event, Name, State, Constraint),
                            streamID    = tr_opt_StreamID(Id, State),
                            eventAction = tr_opt_SecondRequestedActions(Actions, State),
                            evParList   = [tr_EventParameter(P, Name, State) || P <- Parms]}.


tr_opt_SecondRequestedActions(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_SecondRequestedActions(#'SecondRequestedActions'{keepActive        = Keep,
                                                        eventDM           = DM,
                                                        signalsDescriptor = SigDesc},
                              State) ->
    #'SecondRequestedActions'{keepActive        = tr_opt_keepActive(Keep, State),
                              eventDM           = tr_opt_EventDM(DM, State),
                              signalsDescriptor = tr_opt_SignalsDescriptor(SigDesc, State)}.

tr_EventBufferDescriptor(EventSpecs, State) ->
    [tr_EventSpec(ES, State) || ES <- EventSpecs].

tr_EventSpec(#'EventSpec'{eventName    = Name,
                          streamID     = Id,
                          eventParList = Parms},
             State) ->
    #'EventSpec'{eventName    = tr_EventName(Name, State),
                 streamID     = tr_opt_StreamID(Id, State),
                 eventParList = [tr_EventParameter(P, Name, State) || P <- Parms]}.

tr_opt_SignalsDescriptor(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_SignalsDescriptor(SigDesc, State) ->
    tr_SignalsDescriptor(SigDesc, State).

tr_SignalsDescriptor(SigDesc, State)  when list(SigDesc) ->
    [tr_SignalRequest(SigReq, State) || SigReq <- SigDesc].

tr_SignalRequest({Tag, Val}, State) ->
    Val2 =
        case Tag of
            signal     -> tr_Signal(Val, State);
            seqSigList -> tr_SeqSigList(Val, State)
        end,
    {Tag, Val2}.


tr_SeqSigList(#'SeqSigList'{id         = Id,
                            signalList = SigList},
              State) when list(SigList) ->
    #'SeqSigList'{id         = tr_UINT16(Id, State),
                  signalList = [tr_Signal(Sig, State) || Sig <- SigList]}.

tr_Signal(#'Signal'{signalName       = Name,
                    streamID         = Id,
                    sigType          = Type,
                    duration         = Dur,
                    notifyCompletion = Compl,
                    keepActive       = Keep,
                    sigParList       = Parms},
          State) ->
    #'Signal'{signalName       = tr_SignalName(Name, State),
              streamID         = tr_opt_StreamID(Id, State),
              sigType          = tr_opt_SignalType(Type, State),
              duration         = tr_opt_duration(Dur, State),
              notifyCompletion = tr_opt_NotifyCompletion(Compl, State),
              keepActive       = tr_opt_keepActive(Keep, State),
              sigParList       = [tr_SigParameter(P, Name, State) || P <- Parms]}.

tr_opt_duration(asn1_NOVALUE, _State) ->
    asn1_NOVALUE;
tr_opt_duration(Dur, State) ->
    tr_UINT16(Dur, State).