Kamaelia docs : Kamaelia.Audio.PyMedia.Resample

Resampling Audio using PyMedia

This component resamples raw audio data sent to its "inbox" inbox, changing it to a different sample rate and/or number of channels, and outputting it from its "outbox" outbox. It does this using the pymedia library.

Example Usage

Capturing CD quality audio and playing it at telephone quality (8KHz, mono):

Pipeline( Input(sample_rate=44100, channels=2, format="S16_LE"),
          Resample(44100, 2, 8000, 1),
          Output(sample_rate=8000, channels=1, format="S16_LE"),

How does it work?

Resample uses the PyMedia library to change the sample rate and/or number of channels of audio.

Send raw binary audio data strings to its "inbox" inbox. It will be resampled and the resulting raw binary audio data strings are sent out of its "outbox" outbox.

Note that resampling can change the sample rate or number of channels, but not the sample format. The sample format output will be the same as the input.

Resampling is done by duplicating/dropping samples. No interpolation takes place. This is therefore not a good quality resample, but it is reasonably fast.

This component will terminate if a shutdownMicroprocess or producerFinished message is sent to the "control" inbox. The message will be forwarded on out of the "signal" outbox just before termination.


class Resample(Axon.Component.component)

Resample(sample_rate,channels,to_sample_rate,to_channels) -> new Resample component.

Resamples audio to a different sample rate and/or number of channels using the pymedia library.

Keyword arguments:

  • sample_rate -- Input sample rate in Hz
  • channels -- Input number of channels
  • to_sample_rate -- Desired sample rate in Hz
  • to_channels -- Desired number of channels

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.


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

Kamaelia is an open source project originated from and guided by BBC Research. For more information browse the site or get in contact.

This is an ongoing community based development site. As a result the contents of this page is the opinions of the contributors of the pages involved not the organisations involved. Specificially, this page may contain personal views which are not the views of the BBC. (the site is powered by a wiki engine)

(C) Copyright 2008 Kamaelia Contributors, including the British Broadcasting Corporation, All Rights Reserved.

This web site is powered by the same code created for the bicker manor project. For more details, contact Michael Sparks at BBC Research directly (cf contact)