Accurate BPM event listener in AS3?

This is very tricky to get right! There's a small lib called BeatTimer that tries to do this. I haven't tried this code myself, but if it does what it claims it should be exactly what you need.

I just gave that BeatTimer a try. It was written to kick an event on quarter beats at a specific BPM. I tested it with eighths and sixteenths and it stays accurate for the duration of my 2 min loop.

I would like to also try Joa's solution but for my purposes this BeatTimer works well. Thanks. – knuckfubuck Dec 8 '09 at 7:17.

You can also use the new Sound API with the SampleDataEvent and basically play your MP3 manually using Sound.extract(). In that case you know the latency up front and can even count up to the sample when your (delayed) event should happen. This is what we do in the AudioTool and it works very well.

Setting the frame rate so that the event interval is a multiple of the frame rate might help (for example, 167ms equals 6 fps; 12, 18, 24 etc. Are then also ok). If I understood correctly, better solution would be to use the enterframe event. Instead of determining the position of the animation by counting the events, calculate it using elapsed time (getTimer or sound position).

This would also make the animation work on slower computers that have lag.

I was looking through the popforge library's AudioBuffer and tried using one of the approach. That's the create a sync sound. The following is what I did.

Var syncSamples:ByteArray = new ByteArray(); syncSamples. Length = (2646000 / _bpm) MONO, Audio. BIT16, Audio.

RATE44100, soundInit); The ms delay is pretty close, eg: at 120 BPM, it's between 509 - 512ms. The question is, am I going in the right direction?

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