71 lines
2.1 KiB
Go
71 lines
2.1 KiB
Go
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package astits
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// Running statuses
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const (
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RunningStatusNotRunning = 1
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RunningStatusPausing = 3
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RunningStatusRunning = 4
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RunningStatusServiceOffAir = 5
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RunningStatusStartsInAFewSeconds = 2
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RunningStatusUndefined = 0
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)
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// SDTData represents an SDT data
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// Page: 33 | Chapter: 5.2.3 | Link: https://www.dvb.org/resources/public/standards/a38_dvb-si_specification.pdf
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type SDTData struct {
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OriginalNetworkID uint16
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Services []*SDTDataService
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TransportStreamID uint16
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}
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// SDTDataService represents an SDT data service
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type SDTDataService struct {
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Descriptors []*Descriptor
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HasEITPresentFollowing bool // When true indicates that EIT present/following information for the service is present in the current TS
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HasEITSchedule bool // When true indicates that EIT schedule information for the service is present in the current TS
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HasFreeCSAMode bool // When true indicates that access to one or more streams may be controlled by a CA system.
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RunningStatus uint8
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ServiceID uint16
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}
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// parseSDTSection parses an SDT section
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func parseSDTSection(i []byte, offset *int, offsetSectionsEnd int, tableIDExtension uint16) (d *SDTData) {
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// Init
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d = &SDTData{TransportStreamID: tableIDExtension}
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// Original network ID
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d.OriginalNetworkID = uint16(i[*offset])<<8 | uint16(i[*offset+1])
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*offset += 2
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// Reserved for future use
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*offset += 1
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// Loop until end of section data is reached
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for *offset < offsetSectionsEnd {
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// Service ID
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var s = &SDTDataService{}
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s.ServiceID = uint16(i[*offset])<<8 | uint16(i[*offset+1])
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*offset += 2
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// EIT schedule flag
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s.HasEITSchedule = uint8(i[*offset]&0x2) > 0
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// EIT present/following flag
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s.HasEITPresentFollowing = uint8(i[*offset]&0x1) > 0
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*offset += 1
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// Running status
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s.RunningStatus = uint8(i[*offset]) >> 5
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// Free CA mode
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s.HasFreeCSAMode = uint8(i[*offset]&0x10) > 0
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// Descriptors
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s.Descriptors = parseDescriptors(i, offset)
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// Append service
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d.Services = append(d.Services, s)
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}
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return
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}
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