RTP Payload Format for CCSDS Compressed Image Data
draft-herrero-avt-ccsds-00

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Internet Engineering Task Force                               R. Herrero
Internet-Draft                                   Northeastern University
Intended status: Informational                              C. St.Pierre
Expires: December 23, 2019                                          L7TR
                                                           June 21, 2019

           RTP Payload Format for CCSDS Compressed Image Data
                       draft-herrero-avt-ccsds-00

Abstract

   This memo describes an RTP payload format for the Consultative
   Committee for Space Data Systems (CCSDS) Compressed Image Data
   standard [CCSDS122.0].  The compression is typically applied to two-
   dimensional and three-dimensional data cubes resulting from
   multispectral and hyperspectral imagining instruments.

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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Header Format . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  RTP Fixed Header Usage  . . . . . . . . . . . . . . . . .   3
     3.2.  RTP Payload Header Format . . . . . . . . . . . . . . . .   4
   4.  RTP Packetization . . . . . . . . . . . . . . . . . . . . . .   5
   5.  SDP Parameters  . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The CCSDS compressed image data standard can be used to produce both
   lossy and lossless compression in a scenario that targets high-rate
   instruments used on board of spacecraft.  Moreover it provides a
   trade-off between compression performance and complexity with
   particular emphasis on spacecraft applications.  As a low complexity
   mechanism it supports fast and low power hardware implementations.

   The compressor consists of two functional parts, shown in Figure 1, a
   Discrete Wavelet Transform module that performs decorrelation and a
   Bit-Plane Encoder which encodes the decorrelated data.  It is outside
   the scope of this document to further describe in detail this
   procedure.  Please refer to [CCSDS122.0] for more information.

                 +----------+    +----------+
                 | Discrete |    |   Bit    |
   Raw Image ==> |   Wave   |--->|  Plane   | ==> Compressed Image
                 | Transform|    |  Encoder |
                 +----------+    +----------+

              Block diagram of the CCSDS encoder[CCSDS122.0].

                                 Figure 1

   The coded data that results from each CCSDS compressed image is
   composed of a sequence of self-contained and self-defined segments.
   Depending on the size of the segments several RTP packetization
   scenarios are possible; (1) Each RTP packet transports a single
   segment, (2) Each RTP packet transports several fragments or (3) Each
   fragment is transported across several RTP packets.  In particular,
   for cases (2) and (3), if segments are packetized directly over RTP

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   there is potential for corruption that extends beyond segments
   affected by packet loss.
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