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membrane_rtp_plugin

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Membrane Multimedia Framework plugin for RTP

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membrane_rtp_plugin lib membrane rtp header.ex
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lib/membrane/rtp/header.ex 

defmodule Membrane.RTP.Header do

  @moduledoc """

  Describes RTP Header defined in [RFC3550](https://tools.ietf.org/html/rfc3550#page-13)



  ```

   0                   1                   2                   3

   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  |V=2|P|X|  CC   |M|     PT      |       sequence number         |

  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  |                           timestamp                           |

  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  |           synchronization source (SSRC) identifier            |

  +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

  |            contributing source (CSRC) identifiers             |

  |                             ....                              |

  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  ```

  """



  alias Membrane.RTP



  @typedoc """

  This field identifies the version of RTP. The version defined by this specification is 2.

  """

  @type version :: 2



  @typedoc """

  The interpretation of the marker is defined by a profile

  """

  @type marker :: boolean()



  @typedoc """

  Timestamp of a packet in ticks of clock according to `t:RTP.clock_rate_t/0`.



  Its initial value is random, so it should not be interpreted as an absolute time, but rather used to calculate

  time difference from other timestamps.

  """

  @type timestamp_t() :: non_neg_integer()



  @typedoc """

  A 16-bit integer sequential number of a packet.



  Its initial value should be random.

  """

  @type sequence_number_t() :: non_neg_integer()



  @type t :: %__MODULE__{

          version: version(),

          ssrc: RTP.ssrc_t(),

          marker: marker(),

          payload_type: RTP.payload_type_t(),

          timestamp: timestamp_t(),

          sequence_number: sequence_number_t(),

          csrcs: [RTP.ssrc_t()],

          extension: __MODULE__.Extension.t() | nil

        }



  @enforce_keys [

    :ssrc,

    :payload_type,

    :timestamp,

    :sequence_number

  ]

  defstruct @enforce_keys ++

              [

                version: 2,

                marker: false,

                csrcs: [],

                extension: nil

              ]

end