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Design an Audio Plugin

Open Live Script

An audio plugin encapsulates an audio processing algorithm and enables you to tune the parameters of the algorithm while streaming audio.

Define an Audio Plugin

To define a plugin that enables users to adjust stereo width:

  1. Create a class definition that inherits fromaudioPlugin.

  2. 参数化的立体声宽度加工基地gorithm by defining the public propertyWidth.

  3. Enable users to tune the stereo width by defining anaudioPluginInterfacethat containsWidthas anaudioPluginParameter.

  4. Define the audio processing by creating aprocessmethod. Theprocessmethod takes the audio input,in, and adjusts the stereo width by: (a) applying mid-side encoding, (b) adjusting the stereo width based on the user-controlledWidthparameter, and then (c) applying mid-side decoding.

classdefStereoWidth < audioPlugin% <== (1) Inherit from audioPlugin.propertiesWidth = 1;% <== (2) Define tunable property.endproperties(Constant) PluginInterface = audioPluginInterface(...% <== (3) Map tunable property to plugin parameter.audioPluginParameter('Width',...'Mapping',{'pow',2,0,4}));endmethodsfunctionout = process(plugin,in)%< == (4) Define audio processing.x = [in(:,1) + in(:,2), in(:,1) - in(:,2)];% (a) Mid-side encoding.y = [x(:,1), x(:,2)*plugin.Width];% (b) Adjust stereo width.out = [(y(:,1) + y(:,2))/2, (y(:,1) - y(:,2))/2];% (c) Mid-side decoding.endendend

Prototype the Audio Plugin

Once you have defined an audio plugin, you can prototype it using theAudio Test Benchapp. TheAudio Test Benchapp enables you to stream audio through the plugin while you tune parameters, perform listening tests, and visualize the original and processed audio. To open yourStereoWidthplugin in theAudio Test Benchapp, at the MATLAB® command prompt, enter:

audioTestBench(StereoWidth)

Validate and Generate a VST Plugin

You can validate a MATLAB® audio plugin and generate a VST plugin from theAudio Test Bench. You can also validate and generate the plugin from the command line by using thevalidateAudioPluginandgenerateAudioPluginfunctions. Once generated, you can deploy your plugin to a digital audio workstation (DAW).

validateAudioPluginStereoWidthgenerateAudioPluginStereoWidth

The VST plugin is saved to your working directory.

See Also

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