EngineCodeGuidelines

From MixxxWiki

The mixing engine code inside Mixxx needs to run in realtime and must execute as quickly as possible in order to minimize the chance of buffer underruns in the soundcard.

Here's some coding tips to help keep performance decent:

• Don't use signals/slots in code that gets called in the callback thread - that is, use signals/slots to interact with any EngineObject's process() function.
• Don't access ConfigKeys in code that gets called in the callback thread (same as above). ConfigKey access is slow - Use a ControlObject instead. In some situations, you may have to have both a ConfigKey (to save a setting) and a ControlObject to access it (to read the setting, in high performance code).