@spec make_headers([pos_integer()], mode()) :: binary()

Utility function that constructs an AU header section for a payload with the corresponding AU sizes. From the RFC:

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
|AU-headers-length|AU-header|AU-header|      |AU-header|padding|
|                 |   (1)   |   (2)   |      |   (n)   | bits  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+

It is important to note that for AAC each individual header is octet aligned, and so padding is not needed. The AU-headers-length is measured in bits, and for AAC defined to be coded using 16 bits. A single header consists of the size of the corresponding frame measured in bytes, followed by an AU-index for the first frame in the payload, and an AU-index-delta otherwise. The AU-index MUST be 0. The delta values need not be 0 in general unless one assumes no interleaving, as is done here.

@spec parse_packet(binary(), any()) :: {:ok, [binary()]} | {:error, any()}

Parses an RTP payload by first parsing the header section and then the frames themselves. For more information about the header size, see make_headers/2 from this module. From the RFC:

   +---------+-----------+-----------+---------------+
   | RTP     | AU Header | Auxiliary | Access Unit   |
   | Header  | Section   | Section   | Data Section  |
   +---------+-----------+-----------+---------------+

             <----------RTP Packet Payload----------->

For AAC the auxiliary section must always be empty.