RTP Payload Format for the Mixed Excitation Linear Prediction Enhanced (MELPe) Codec
RFC 8130
Internet Engineering Task Force (IETF) V. Demjanenko
Request for Comments: 8130 D. Satterlee
Category: Standards Track VOCAL Technologies, Ltd.
ISSN: 2070-1721 March 2017
RTP Payload Format
for the Mixed Excitation Linear Prediction Enhanced (MELPe) Codec
Abstract
This document describes the RTP payload format for the Mixed
Excitation Linear Prediction Enhanced (MELPe) speech coder. MELPe's
three different speech encoding rates and sample frame sizes are
supported. Comfort noise procedures and packet loss concealment are
described in detail.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc8130.
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Demjanenko & Satterlee Standards Track [Page 1]
RFC 8130 RTP Payload Format for MELPe Codec March 2017
Table of Contents
1. Introduction ....................................................2
1.1. Conventions ................................................2
2. Background ......................................................3
3. Payload Format ..................................................4
3.1. MELPe Bitstream Definitions ................................5
3.1.1. 2400 bps Bitstream Structure ........................6
3.1.2. 1200 bps Bitstream Structure ........................9
3.1.3. 600 bps Bitstream Structure ........................13
3.2. MELPe Comfort Noise Bitstream Definition ..................18
3.3. Multiple MELPe Frames in an RTP Packet ....................20
3.4. Congestion Control Considerations .........................21
4. Payload Format Parameters ......................................22
4.1. Media Type Definitions ....................................22
4.2. Mapping to SDP ............................................23
4.3. Declarative SDP Considerations ............................25
4.4. Offer/Answer SDP Considerations ...........................25
5. Discontinuous Transmissions ....................................26
6. Packet Loss Concealment ........................................26
7. IANA Considerations ............................................26
8. Security Considerations ........................................27
9. References .....................................................27
9.1. Normative References ......................................27
9.2. Informative References ....................................29
Authors' Addresses ................................................30
1. Introduction
This document describes how compressed Mixed Excitation Linear
Prediction Enhanced (MELPe) speech as produced by the MELPe codec
may be formatted for use as an RTP payload. Details are provided to
packetize the three different codec bitrate data frames (2400, 1200,
and 600) into RTP packets. The sender may send one or more codec
data frames per packet, depending on the application scenario or
based on transport network conditions, bandwidth restrictions, delay
requirements, and packet loss tolerance.
1.1. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Best current practices for writing an RTP payload format
specification were followed [RFC2736].
Demjanenko & Satterlee Standards Track [Page 2]
RFC 8130 RTP Payload Format for MELPe Codec March 2017
2. Background
The MELP speech coder was developed by the US military as an upgrade
Show full document text