Review is requested for the parameters defined below. These parameters are optional additions for media type audio/mpeg4-generic. The quoted IANA Considerations section comes from draft-ietf-avt-mps-01.txt. Tom Taylor AVT Co-Chair =========================================== 5. IANA Considerations This memo defines additional optional format parameters to the Media subtype mpeg4-generic. These parameters SHALL only be used in combination with the AAC-lbr or AAC-hbr modes (cf. [RFC3640] section 3.3). 5.1. Media Type registration This memo defines the following additional optional parameters which SHALL be used if MPEG Surround data is present inside the payload of an AAC elementary stream. MPS-profile-level-id: A decimal representation of the MPEG Surround Profile Level indication as defined in [14496-3]. This parameter MUST be used in the capability exchange or session set-up procedure to indicate the MPEG Surround Profile and Level that the decoder must be capable in order to decode the stream. MPS-config: A hexadecimal representation of an octet string that expresses the AudioSpecificConfig (ASC) as defined in [14496-3] for MPEG Surround. The ASC is mapped onto the hexadecimal octet string in an MSB-first basis. The AOT in this ASC SHALL have the value 30. The SSC inside the ASC MUST have the sacPayloadEmbedding flag set to 1. 5.2. Registration of Mode Definitions with IANA This memo defines the modes MPS-hbr and MPS-lbr.