74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
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package astits
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import "time"
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// EITData represents an EIT data
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// Page: 36 | Chapter: 5.2.4 | Link: https://www.dvb.org/resources/public/standards/a38_dvb-si_specification.pdf
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type EITData struct {
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Events []*EITDataEvent
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LastTableID uint8
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OriginalNetworkID uint16
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SegmentLastSectionNumber uint8
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ServiceID uint16
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TransportStreamID uint16
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}
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// EITDataEvent represents an EIT data event
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type EITDataEvent struct {
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Descriptors []*Descriptor
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Duration time.Duration
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EventID uint16
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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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StartTime time.Time
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}
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// parseEITSection parses an EIT section
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func parseEITSection(i []byte, offset *int, offsetSectionsEnd int, tableIDExtension uint16) (d *EITData) {
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// Init
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d = &EITData{ServiceID: tableIDExtension}
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// Transport stream ID
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d.TransportStreamID = uint16(i[*offset])<<8 | uint16(i[*offset+1])
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*offset += 2
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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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// Segment last section number
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d.SegmentLastSectionNumber = uint8(i[*offset])
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*offset += 1
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// Last table ID
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d.LastTableID = uint8(i[*offset])
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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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// Event ID
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var e = &EITDataEvent{}
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e.EventID = uint16(i[*offset])<<8 | uint16(i[*offset+1])
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*offset += 2
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// Start time
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e.StartTime = parseDVBTime(i, offset)
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// Duration
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e.Duration = parseDVBDurationSeconds(i, offset)
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// Running status
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e.RunningStatus = uint8(i[*offset]) >> 5
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// Free CA mode
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e.HasFreeCSAMode = uint8(i[*offset]&0x10) > 0
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// Descriptors
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e.Descriptors = parseDescriptors(i, offset)
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// Add event
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d.Events = append(d.Events, e)
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}
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return
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}
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