31 lines
982 B
Go
31 lines
982 B
Go
package astits
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// PATData represents a PAT data
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// https://en.wikipedia.org/wiki/Program-specific_information
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type PATData struct {
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Programs []*PATProgram
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TransportStreamID uint16
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}
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// PATProgram represents a PAT program
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type PATProgram struct {
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ProgramMapID uint16 // The packet identifier that contains the associated PMT
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ProgramNumber uint16 // Relates to the Table ID extension in the associated PMT. A value of 0 is reserved for a NIT packet identifier.
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}
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// parsePATSection parses a PAT section
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func parsePATSection(i []byte, offset *int, offsetSectionsEnd int, tableIDExtension uint16) (d *PATData) {
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// Init
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d = &PATData{TransportStreamID: tableIDExtension}
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// Loop until end of section data is reached
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for *offset < offsetSectionsEnd {
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d.Programs = append(d.Programs, &PATProgram{
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ProgramMapID: uint16(i[*offset+2]&0x1f)<<8 | uint16(i[*offset+3]),
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ProgramNumber: uint16(i[*offset])<<8 | uint16(i[*offset+1]),
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})
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*offset += 4
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}
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return
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}
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