Kamaelia.Audio.PyMedia.Resample

• component Resample

• Resampling Audio using PyMedia
  • Example Usage
  • How does it work?

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"),
        ).run()

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.

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Kamaelia.Audio.PyMedia.Resample.Resample

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

Inboxes

Outboxes

Methods defined here

__init__(self, sample_rate, channels, to_sample_rate, to_channels)

main(self)