YTSFlix_Go/vendor/github.com/asticode/go-astits/data_nit.go

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2018-11-04 14:58:15 +00:00
package astits
// NITData represents a NIT data
// Page: 29 | Chapter: 5.2.1 | Link: https://www.dvb.org/resources/public/standards/a38_dvb-si_specification.pdf
type NITData struct {
NetworkDescriptors []*Descriptor
NetworkID uint16
TransportStreams []*NITDataTransportStream
}
// NITDataTransportStream represents a NIT data transport stream
type NITDataTransportStream struct {
OriginalNetworkID uint16
TransportDescriptors []*Descriptor
TransportStreamID uint16
}
// parseNITSection parses a NIT section
func parseNITSection(i []byte, offset *int, tableIDExtension uint16) (d *NITData) {
// Init
d = &NITData{NetworkID: tableIDExtension}
// Network descriptors
d.NetworkDescriptors = parseDescriptors(i, offset)
// Transport stream loop length
var transportStreamLoopLength = int(uint16(i[*offset]&0xf)<<8 | uint16(i[*offset+1]))
*offset += 2
// Transport stream loop
transportStreamLoopLength += *offset
for *offset < transportStreamLoopLength {
// Transport stream ID
var ts = &NITDataTransportStream{}
ts.TransportStreamID = uint16(i[*offset])<<8 | uint16(i[*offset+1])
*offset += 2
// Original network ID
ts.OriginalNetworkID = uint16(i[*offset])<<8 | uint16(i[*offset+1])
*offset += 2
// Transport descriptors
ts.TransportDescriptors = parseDescriptors(i, offset)
// Append transport stream
d.TransportStreams = append(d.TransportStreams, ts)
}
return
}