frames rendered
0
demo · v131
worklet under increasing load: induce underruns
An AudioWorkletNode running a CPU-busy DSP path. The slider sets how many synthetic milliseconds each process() call burns. Push it past your CPU's tolerance and the playback stats start counting fallbackFramesDuration. This is the DAW heart-attack monitor.
expected frames
0
deviation
0
fallback duration
0
total duration
0s
When the load slider pushes the worklet's process() over the render quantum budget (≈2.7ms for 128 frames at 48kHz), the audio thread can't deliver frames fast enough and the stats count it.
the api
const stats = ctx.playbackStats; // AudioPlaybackStats
console.log(stats.framesRendered);
console.log(stats.fallbackFramesDuration); // total underrun time in seconds
console.log(stats.fallbackFramesEvents); // number of distinct underrun events
console.log(stats.totalFramesDuration);