Libdabdemod

Introduction

libdabdemod is a library that demodulates the digital OFDM DAB signal and outputs the digital DAB stream. At the moment this library is in the concept phase.

Usage

Tune to a specific frequency

This flowchart shows how to tune to a specific frequency or channel.

Tune to a specific service channel

This flowchart shows how to tune to a specific service channel.

API Description

DemodError LibDABDemod::SetDevice(LibSDRSource* libSDRSource)

Description	Sets the SDR driver source from the library libsdrsource.
Parameter	libSDRSource: libsdrsource object
return	Error code enum object

DemodError LibDABDemod::OpenDevice(void)

Description	Opens the device
Parameter	none
return	Error code enum object

DemodError LibDABDemod::CloseDevice(void)

Description	Closes the device
Parameter	none
return	Error code enum object

DemodError LibDABDemod::Start(void)

Description	Starts the OFDM demodulation
Parameter	none
return	Error code enum object

DemodError LibDABDemod::Stop(void)

Description	Stops the OFDM demodulation
Parameter	none
return	Error code enum object

DemodError LibDABDemod::SetFrequency(int32_t FrequencyKHz)

Description	Sets the channel frequency in kHz
Parameter	FrequencyKHz: Channel frequency in kHz
return	Error code enum object

 DemodError LibDABDemod::SetChannel(string Channel)

Description	Sets the channel (Band III: 5A to 13F; L band: LA to LP)
Parameter	Channel: Channel string e.g.
return	Error code enum object

DemodError LibDABDemod::GetFrequency(int32_t* FrequencyKHz)

Description	Gets the current frequency
Parameter	FrequencyKHz: Pointer to frequency in KHz
return	Error code enum object

DemodError LibDABDemod::GetChannel(string* Channel)

Description	Gets the current channel
Parameter	Channel: Channel string e.g. “5A”
return	Error code enum object

DemodError LibDABDemod::GetSignalStatus(CSignalStatus* SignalStatus)

Description	Gets the current signal status
Parameter	SignalStatus: Pinter to signal status object.
return	Error code enum object

DemodError LibDABDemod::RemoveServiceComponent(CServiceComponent ServiceComponent)

Description	Removes a selected service component
Parameter	ServiceComponent: Service component object
return	Error code enum object

CServiceComponent LibDABDemod::AddServiceComponent(char mode, char SubChId, short StartCU, char UEP_EEP, char UEPTabldx, char EEPIdx, short CUNum, short PacketAddr, char FECScheme)

Description	Adds a service component
Parameter	Mode: DAB Mode. 0: DAB audio, 1: DAB+ audio, 2: packet, 3: stream SubChId: Sub-channel identifier StartCU: Address the first Capacity Unit (CU) of the sub-channel UEP_EEP: Short or the long form of the size and protection field. 0: short form (UEP), 1: long form (EEP) UEPTabldx: UEP Table index. Only used if UEP_EEP=0 EEPIdx: Protection level. Only used if UEP_EEP=1 CUNum: Sub-channel size (CUs) PacketAddr: Address of the packet in which the service component is carried FECScheme: FEC Scheme
return	Service component object, NULL if an error occurred

For a detailed description please see "ETSI EN 300 401" section 6.2 "Sub-channel organization" and 6.3 "Service organization". [1]

DemodError LibDABDemod::GetServiceData(CServiceComponent ServiceComponent, CServiceData &ServiceData)

Description	Gets the data of a selected service channel. This method is blocking. It blocks until new data is available.
Parameter	ServiceComponent: Service component buffer
return	Error code enum object

DemodError LibDABDemod::GetFICData(CFICData &FICData)

Description	Gets the FIC data. This method is blocking. It blocks until new data is available.
Parameter	FICData: FIC data buffer
return	Error code enum object