[media-types] Registration of audio/aptx

["Ali C. Begen (abegen)" <[e-mail]>]

Hello, 

The following draft is requesting to register a new media subtype (Section 6.1). Your review is appreciated. 
https://datatracker.ietf.org/doc/draft-ietf-payload-rtp-aptx/?include_text=1

Below is the text.

Thanks,
-acbegen
Payload WG Co-Chair


Registration of media subtype audio/aptx.

     MIME media type name: audio

     MIME subtype name: aptx

     Required parameters:

        rate:
        RTP timestamp clock rate, which is equal to the sampling rate
        in Hz.  -- RECOMMENDED values for rate are 8000, 11025, 16000, 
        22050, 24000, 32000, 44100 and 48000 samples per second. Other 
        values are permissible.

        channels:
        The number of logical audio channels that are present in the  
        audio stream.

        variant:
        The variant of apt-X (i.e.  Standard or Enhanced) that is being
        used.  The following variants can be signalled:

           variant=standard
           variant=enhanced

        bitresolution:
        The number of bits used by the algorithm to encode 4 PCM
        samples.  This value MAY only be set to 16 for Standard apt-X
        and 16 or 24 for Enhanced apt-X.

     Optional parameters:

        ptime:
        The recommended length of time (in milliseconds) represented by
        the media in a packet.  Defaults to 4 ms. See Section 6 of 
        [RFC4566].

        maxptime:
        The maximum length of time (in milliseconds) that can be
        encapsulated in a packet.  See Section 6 of [RFC4566].

        stereo-channel-pairs:
        Defines audio channels that are stereo paired in the stream. 
        See Section 3.  Each pair of audio channels is defined as two 
        comma-separated values that correspond to channel numbers in 
        the range 1..channels.  Each stereo channel pair is preceded 
        by a '{', and followed by a '}'.  Pairs of audio channels are 
        separated by a comma.  A channel MUST NOT be paired with more
        than one other channel.  Absence of this parameter signals that
        each channel has been independently encoded.

        embedded-autosync-channels:
        Defines channels that carry embedded autosync.  embedded-
        autosync-channels is defined as a list of comma-separated 
        values that correspond to channel numbers in the range 1..
        channels.  When a channel is stereo paired, embedded autosync
        is shared across channels in the pair. Only the first channel 
        as defined in stereo-channel-pairs MUST be specified in the 
        embedded-autosync-channels list.

        embedded-aux-channels: 
        Defines channels that carry embedded auxiliary data.  embedded-
        aux-channel is defined as a list of comma-separated values 
        that correspond to channel numbers in the range 1..channels.
        When a channel is stereo paired, embedded auxiliary data is 
        shared across channels in the pair. Only the second channel as 
        defined in stereo-channel-pairs MUST be specified in the
        embedded-autosync-channels list.

     Encoding considerations: This type is only defined for transfer
     via RTP [RFC3550].

     Security considerations: See Section 5 of [RFC4855] and Section 4
     of [RFC4856].

     Interoperability considerations: none

     Published specification: RFC XXXX

     Applications which use this media type: Audio streaming

     Additional information: none

     Person & email address to contact for further information: John 
     Lindsay email:[e-mail]

     Intended usage: COMMON

     Author/Change controller: John Lindsay