cliencde.md

Command Line Encoding

Encoding from JSON

Converting SCTE-35 formats

Encoding

The threefive cli tool can now encode JSON to SCTE-35. The JSON needs to be in threefive format.

• a@fu:~$ threefive '/DAWAAAAAAAAAP/wBQb+ABt4xwAAwhCGHw==' 2> json.txt

• cat json.txt

 {
    "info_section": {
        "table_id": "0xfc",
        "section_syntax_indicator": false,
        "private": false,
        "sap_type": "0x03",
        "sap_details": "No Sap Type",
        "section_length": 22,
        "protocol_version": 0,
        "encrypted_packet": false,
        "encryption_algorithm": 0,
        "pts_adjustment": 0.0,
        "cw_index": "0x00",
        "tier": "0x0fff",
        "splice_command_length": 5,
        "splice_command_type": 6,
        "descriptor_loop_length": 0,
        "crc": "0xc210861f"
    },
    "command": {
        "command_length": 5,
        "command_type": 6,
        "name": "Time Signal",
        "time_specified_flag": true,
        "pts_time": 20.004344
    },
    "descriptors": []
}

• Change the pts_time
  • Here I do it with sed, you can use any editor

sed -i 's/20.004344/60.0/' json.txt

• Re-encode as Base64

a@fu:~$ cat json.txt | threefive encode

/DAWAAAAAAAAAP/wBQb+AFJlwAAAZ1PBRA==

• Re-encode as Hex

a@fu:~$ cat json.txt | threefive encode hex
0xfc301600000000000000fff00506fe005265c000006753c144

• Re-encode as an integer

a@fu:~$ cat json.txt | threefive encode int
1583008701074197245727019716796221242034694813189400685691204

• Re-encode as bytes

a@fu:~$ cat json.txt | threefive encode bytes
b'\xfc0\x16\x00\x00\x00\x00\x00\x00\x00\xff\xf0\x05\x06\xfe\x00Re\xc0\x00\x00gS\xc1D'

---

Converting

• Converting involves piping one threefive command into another.

• From:

  • Base64
  • Hex

• To

  • Base64
  • Bytes
  • Hex
  • Int

• Base64 to hex

a@fu:~$ threefive '/DAWAAAAAAAAAP/wBQb+ABt4xwAAwhCGHw==' 2>&1 | threefive encode hex

0xfc301600000000000000fff00506fe001b78c70000c210861f

• Hex to Integer

a@fu:~$ threefive '0xfc301600000000000000fff00506fe001b78c70000c210861f' 2>&1| threefive encode int

1583008701074197245727019716796221242033681613329959740278303

• Hex to Bytes

a@fu:~$ threefive '0xfc301600000000000000fff00506fe001b78c70000c210861f' 2>&1| threefive encode bytes

b'\xfc0\x16\x00\x00\x00\x00\x00\x00\x00\xff\xf0\x05\x06\xfe\x00\x1bx\xc7\x00\x00\xc2\x10\x86\x1f'