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package dmr
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// Data Type information element definitions, DMR Air Interface (AI) protocol, Table 6.1
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const (
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PrivacyIndicator uint8 = iota // Privacy Indicator information in a standalone burst
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VoiceLC // Indicates the beginning of voice transmission, carries addressing information
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TerminatorWithLC // Indicates the end of transmission, carries LC information
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ControlBlock // Carries a control block
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MultiBlockControl // Header for multi-block control
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MultiBlockControlContinuation // Follow-on blocks for multi-block control
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Data // Carries addressing and numbering of packet data blocks
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Rate12Data // Payload for rate 1/2 packet data
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Rate34Data // Payload for rate 3⁄4 packet data
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Idle // Fills channel when no info to transmit
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VoiceBurstA // Burst A marks the start of a superframe and always contains a voice SYNC pattern
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VoiceBurstB // Bursts B to F carry embedded signalling in place of the SYNC pattern
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VoiceBurstC // Bursts B to F carry embedded signalling in place of the SYNC pattern
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VoiceBurstD // Bursts B to F carry embedded signalling in place of the SYNC pattern
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VoiceBurstE // Bursts B to F carry embedded signalling in place of the SYNC pattern
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VoiceBurstF // Bursts B to F carry embedded signalling in place of the SYNC pattern
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IPSCSync
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UnknownSlotType
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)
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// Call Type
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const (
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CallTypePrivate uint8 = iota
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CallTypeGroup
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)
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// Packet represents a frame transported by the Air Interface
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type Packet struct {
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// 0 for slot 1, 1 for slot 2
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Timeslot uint8
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// Starts at zero for each incoming transmission, wraps back to zero when 256 is reached
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Sequence uint8
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// Source and destination DMR ID
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SrcID uint32
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DstID uint32
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// 3 bytes registered DMR-ID for public repeaters, 4 bytes for private repeaters
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RepeaterID uint32
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// Random or incremented number which stays the same from PTT-press to PTT-release which identifies a stream
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StreamID uint32
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// Data Type or Slot type
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DataType uint8
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// 0 for group call, 1 for unit to unit
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CallType uint8
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// The on-air DMR data with possible FEC fixes to the AMBE data and/or Slot Type and/or EMB, etc
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Data []byte // 34 bytes
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Bits []byte // 264 bits
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}
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// EMBBits returns the frame EMB bits from the SYNC bits
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func (p *Packet) EMBBits() []byte {
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var (
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b = make([]byte, EMBBits)
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o = EMBHalfBits + EMBSignallingLCFragmentBits
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sync = p.SyncBits()
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)
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copy(b[:EMBHalfBits], sync[:EMBHalfBits])
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copy(b[EMBHalfBits:], sync[o:o+EMBHalfBits])
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return b
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}
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// InfoBits returns the frame Info bits
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func (p *Packet) InfoBits() []byte {
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var b = make([]byte, InfoBits)
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copy(b[0:InfoHalfBits], p.Bits[0:InfoHalfBits])
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copy(b[InfoHalfBits:], p.Bits[InfoHalfBits+SlotTypeBits+SignalBits:])
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return b
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}
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// SyncBits returns the frame SYNC bits
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func (p *Packet) SyncBits() []byte {
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return p.Bits[SyncOffsetBits : SyncOffsetBits+SyncBits]
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}
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// SlotType returns the frame Slot Type parsed from the Slot Type bits
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func (p *Packet) SlotType() []byte {
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return BitsToBytes(p.SlotTypeBits())
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}
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// SlotTypeBits returns the SloT Type bits
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func (p *Packet) SlotTypeBits() []byte {
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var o = InfoHalfBits + SlotTypeHalfBits + SyncBits
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return append(p.Bits[InfoHalfBits:InfoHalfBits+SlotTypeHalfBits], p.Bits[o:o+SlotTypeHalfBits]...)
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}
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// VoiceBits returns the bits containing voice data
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func (p *Packet) VoiceBits() []byte {
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var b = make([]byte, VoiceBits)
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copy(b[:VoiceHalfBits], p.Bits[:VoiceHalfBits])
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copy(b[VoiceHalfBits:], p.Bits[VoiceHalfBits+SignalBits:])
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return b
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}
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func (p *Packet) SetData(data []byte) {
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p.Data = data
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p.Bits = BytesToBits(data)
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}
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// PacketFunc is a callback function that handles DMR packets
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type PacketFunc func(Repeater, *Packet) error
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