A track doesn't have duration and doesn't seek unless I play it for the first time

Question

Calling getDurationMs on an AdvancedAudioPlayer instance always returns 0 before hitting play. Also, calling setPosition doesn't work, which makes sense since the song has 0 ms of duration.

After playing for the first time, the duration gets filled with a proper value, and setPosition works as expected.

Some code:

// Initialization
this.player = new Superpowered.AdvancedAudioPlayer(
    samplerate,
    2,
    2,
    0,
    0.501,
    2,
    false
)

// When the track is loaded
this.player.openMemory(Superpowered.arrayBufferToWASM(buffer), false, false)

// When the UI thread asks for the duration
this.sendMessageToMainScope({
    data: { duration: this.player.getDurationMs() },
})

After calling this.player.play(), this.player.getDurationMs() starts to give the correct duration value.

Is there an explanation for that? Is there any workaround?

---

I could get the correct duration by using Superpowered.Decoder, but having this information is useless because setPosition doesn't work.

Answer 1

You can only access these values after loading the track, which means playing it. A workaround would be to play the track and instantly pause it to get those values.