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membrane_rtp_plugin
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Membrane Multimedia Framework plugin for RTP
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lib/membrane/rtcp/packet_header.ex
defmodule Membrane.RTCP.Header do
@moduledoc """
Struct describing 32-bit header common to all RTCP packets
"""
@enforce_keys [:packet_type, :length, :packet_specific]
defstruct @enforce_keys ++ [padding?: false]
@type packet_type_t :: 200 | 201 | 202 | 203 | 204
@type packet_specific_t :: non_neg_integer()
@type t :: %__MODULE__{
padding?: boolean(),
packet_specific: packet_specific_t(),
packet_type: packet_type_t(),
length: pos_integer()
}
@spec parse(binary()) :: {:ok, t()} | {:error, :invalid_header}
def parse(<<2::2, padding?::1, packet_specific::5, pt::8, length::16>>) do
{:ok,
%__MODULE__{
padding?: padding? == 1,
packet_specific: packet_specific,
packet_type: pt,
length: (length + 1) * 4
}}
end
def parse(_) do
{:error, :invalid_header}
end
@spec to_binary(t()) :: binary()
def to_binary(%__MODULE__{} = header) do
padding? = if header.padding?, do: 1, else: 0
length = div(header.length, 4) - 1
<<2::2, padding?::1, header.packet_specific::5, header.packet_type::8, length::16>>
end
end