April 2024 - This site, and Kamaelia are being updated. There is significant work needed, and PRs are welcome.


Null Payload RTP Classes. Null Payload Pre-Framer. Null Payload RTP Packet Stuffer - Same thing.

This Null payload also assumes constant bit rate load.

Subcomponents functionality:

  • FileControl: - Only if RFA internal - isn't
    • FileReader - only if internal - isn't
    • FileSelector - only if internal - isn't
  • Format Decoding

  • DataFramaing

  • Command Interpreter (Likely to be component core code)


class NullPayloadPreFramer(Axon.Component.component)

control -> File select, file read control, framing control recvsrc -> Block/Chunks of raw disk data
activatesrc -> Control messages to the file reading subsystem output -> The framed data, payload ready


  • ('control', '') : Code uses old style inbox/outbox description - no metadata available
  • ('recvsrc', '') : Code uses old style inbox/outbox description - no metadata available


  • ('output', '') : Code uses old style inbox/outbox description - no metadata available

Methods defined here


You should be using the inbox/outbox interface, not these methods (except construction). This documentation is designed as a roadmap as to their functionalilty for maintainers and new component developers.

__init__(self, sourcename[, sourcebitrate][, chunksize])

  • Name of source - at __init__
  • Data Rate - at __init__
  • Chunksize - at __init__


No closedown/shutdown code


returns quit flag - True means quit



No initialisation



makeChunk(self, datatosend)

C.makeChunk(datatosend) -> chunk : network ready data

sendCurrentChunk(self[, sendpartial])

  • grab first (current chunk size) bytes
  • frame chunk
  • send chunk

updateTimestamp(self, datatosend)


self.timestamp stores the timestamp of the end of the most recently transmitted data, whenever we send some data this timestamp needs to be updated. This method represents the calculation involved. (calculate the time period the data covers, and increment the timestamp)


Got a problem with the documentation? Something unclear that could be clearer? Want to help improve it? Constructive criticism is very welcome - especially if you can suggest a better rewording!

Please leave you feedback here in reply to the documentation thread in the Kamaelia blog.

-- Automatic documentation generator, 05 Jun 2009 at 03:01:38 UTC/GMT