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juce_and_parameter_automation

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juce_and_parameter_automation [2017/10/22 20:17]
shane [The older approach: AudioParameter] 		juce_and_parameter_automation [2017/10/22 20:31]
shane [JUCE and parameter automation]
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 **Automation vs. saving/restoring plugin state:** DAWs and plugins also use an unrelated //non-real-time// method of bi-directional communication scheme, to allow the DAW to save the entire //state// of each plugin as part of a recording project file, in order to later restore that state when the file is reopened for a later editing session. Although this is separate from automation, I consider this an important aspect of plugin parameter management which ought to be integrated into the parameter-handling code. In JUCE, state management is supported through the //getStateInformation()// and //setStateInformation()// methods of the //AudioProcessor// class. **Automation vs. saving/restoring plugin state:** DAWs and plugins also use an unrelated //non-real-time// method of bi-directional communication scheme, to allow the DAW to save the entire //state// of each plugin as part of a recording project file, in order to later restore that state when the file is reopened for a later editing session. Although this is separate from automation, I consider this an important aspect of plugin parameter management which ought to be integrated into the parameter-handling code. In JUCE, state management is supported through the //getStateInformation()// and //setStateInformation()// methods of the //AudioProcessor// class.
  
-JUCE 5 provides two distinct sets of classes to support parameter automation via an older and a newer approach. The older approach, which pre-dates JUCE version 5, involves instantiating parameter objects based on classes derived from //AudioParameter//. The newer approach, based around an extensive new class called //AudioProcessorValueTreeState//, promises more streamlined code and integrated support for //undo/redo// operations. Unfortunately, neither approach is particularly well-documented, so I decided to investigate both myself.+JUCE 5 provides two distinct sets of classes to support parameter automation via an older and a newer approach. The older approach, which pre-dates JUCE version 5, involves instantiating parameter objects based on classes derived from //AudioParameter//. The newer approach, based around an extensive new class called //AudioProcessorValueTreeState//, promises more streamlined code and integrated support for //undo/redo// operations. Neither approach is particularly well-documented, so I decided to investigate both myself.
  
 ===== The older approach: AudioParameter ===== ===== The older approach: AudioParameter =====
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   * **endChangeGesture()** informs the host that this sequence of changes is done   * **endChangeGesture()** informs the host that this sequence of changes is done
  
-This three-stage approach is obviously designed for use with continuous controls such as knobs or sliders, but is actually required for all kinds of parameters.+This three-stage approach is obviously designed for use with continuous controls such as knobs or sliders, but is actually required for all kinds of parameters. (If you omit the //...ChangeGesture()// calls, the host DAW will not receive the changes.)
  
 Updates //from the host to the plugin// are received as asynchronous calls (callbacks) to the //AudioProcessor::setParameter()// method, for which the plugin author must provide an override. In JUCE 5, this  Updates //from the host to the plugin// are received as asynchronous calls (callbacks) to the //AudioProcessor::setParameter()// method, for which the plugin author must provide an override. In JUCE 5, this 
juce_and_parameter_automation.txt ยท Last modified: 2017/10/22 20:32 by shane

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