av/stream/mts/psi/std.go

/*
NAME
  std.go
DESCRIPTION
  See Readme.md

AUTHOR
  Saxon Milton <saxon@ausocean.org>

LICENSE
  std.go is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 for more details.

  You should have received a copy of the GNU General Public License
  along with revid in gpl.txt.  If not, see http://www.gnu.org/licenses.
*/

package psi

const (
	pmtTimeLocationPil = 44
)

// Some common manifestations of PSI
var (
	// PSI struct to represent basic pat
	StdPat = PSI{
		Pf:  0x00,
		Tid: 0x00,
		Ssi: true,
		Pb:  false,
		Sl:  uint16(0x0d),
		Tss: &TSS{
			Tide: uint16(0x01),
			V:    0,
			Cni:  true,
			Sn:   0,
			Lsn:  0,
			Sd: &PAT{
				Pn:    uint16(0x01),
				Pmpid: uint16(0x1000),
			},
		},
	}

	// PSI struct to represent basic pmt without descriptors for time and location
	StdPmt = PSI{
		Pf:  0x00,
		Tid: 0x02,
		Ssi: true,
		Sl:  uint16(0x12),
		Tss: &TSS{
			Tide: uint16(0x01),
			V:    0,
			Cni:  true,
			Sn:   0,
			Lsn:  0,
			Sd: &PMT{
				Pcrpid: 0x0100, // wrong
				Pil:    0,
				Essd: &ESSD{
					St:   0x1b,
					Epid: 0x0100,
					Esil: 0x00,
				},
			},
		},
	}

	// Std pmt with time and location descriptors, time and location fields are zerod out
	StdPmtTimeLocation = PSI{
		Pf:  0x00,
		Tid: 0x02,
		Ssi: true,
		Sl:  uint16(0x3e),
		Tss: &TSS{
			Tide: uint16(0x01),
			V:    0,
			Cni:  true,
			Sn:   0,
			Lsn:  0,
			Sd: &PMT{
				Pcrpid: 0x0100,
				Pil:    pmtTimeLocationPil,
				Pd: []Desc{
					Desc{
						Dt: byte(timeDescTag),
						Dl: byte(timeDataSize),
						Dd: make([]byte, timeDataSize),
					},
					Desc{
						Dt: byte(locationDescTag),
						Dl: byte(locationDataSize),
						Dd: make([]byte, locationDataSize),
					},
				},
				Essd: &ESSD{
					St:   0x1b,
					Epid: 0x0100,
					Esil: 0x00,
				},
			},
		},
	}
)

// Std PSI in bytes form
var (
	StdPatBytes = []byte{
		0x00, // pointer

		// ---- section included in data sent to CRC32 during check
		// table header
		0x00, // table id
		0xb0, // section syntax indicator:1|private bit:1|reserved:2|section length:2|more bytes...:2
		0x0d, // more bytes...

		// syntax section
		0x00, 0x01, // table id extension
		0xc1, // reserved bits:2|version:5|use now:1 1100 0001
		0x00, // section number
		0x00, // last section number
		// table data
		0x00, 0x01, // Program number
		0xf0, 0x00, // reserved:3|program map PID:13

		// 0x2a, 0xb1, 0x04, 0xb2, // CRC
		// ----
	}
	StdPmtBytes = []byte{
		0x00, // pointer

		// ---- section included in data sent to CRC32 during check
		// table header
		0x02, // table id
		0xb0, // section syntax indicator:1|private bit:1|reserved:2|section length:2|more bytes...:2
		0x12, // more bytes...

		// syntax section
		0x00, 0x01, // table id extension
		0xc1, // reserved bits:3|version:5|use now:1
		0x00, // section number
		0x00, // last section number
		// table data
		0xe1, 0x00, // reserved:3|PCR PID:13
		0xf0, 0x00, // reserved:4|unused:2|program info length:10
		// No program descriptors since program info length is 0.
		// elementary stream info data
		0x1b,       // stream type
		0xe1, 0x00, // reserved:3|elementary PID:13
		0xf0, 0x00, // reserved:4|unused:2|ES info length:10
		// No elementary stream descriptors since ES info length is 0.

		// 0x15, 0xbd, 0x4d, 0x56, // CRC
		// ----
	}
)