Steven Frank, the co-founder of Panic, wrote this in 1999, with similar themes:
Stateful transforms are simple objects with member functions that maintain state across calls:
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Notice how by step 3, the time HotAudio’s player calls appendBuffer, the data has already been decrypted by their JavaScript code. It has to be. The browser’s built-in AAC or Opus decoder doesn’t know a damn thing about HotAudio’s proprietary encryption scheme. It only speaks standard codecs. The decryption must happen in JavaScript before the data is handed to the browser.
Graceful Fallback for Extreme Customization: