rtp-packet.ksy

meta:
  id: rtp_packet
  file-extension: rtp
  endian: be
  license: CC0-1.0
doc-ref: https://tools.ietf.org/html/rfc3550
seq:
  - id: version
    type: b2
  - id: has_padding
    type: b1
  - id: has_extension
    type: b1
  - id: crsc_count
    type: b4
  - id: marker
    type: b1
  - id: payload_type
    type: b7
  - id: sequence_number
    type: u2
  - id: timestamp
    type: u4
  - id: ssrc
    type: u4
  - id: csrc
    type: u4
    repeat: expr
    repeat-expr: crsc_count
  - id: header_extension
    type: header_extension
    if: has_extension
  - id: payload
    size: has_padding ? _io.size - _io.pos - padding_len : _io.size - _io.pos
  - id: padding
    size: padding_len
    if: has_padding
instances:
  padding_len:
    pos: _io.size - 1
    type: u1
types:
  header_extension:
    seq:
      - id: identifier
        type: u2
      - id: length
        type: u2
      - id: payload
        size: length