• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Latency and AUTimePitch
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Latency and AUTimePitch


  • Subject: Latency and AUTimePitch
  • From: Ashley Allen <email@hidden>
  • Date: Thu, 12 Jun 2008 16:00:44 -0700

Thanks Jeremy for the suggestions regarding latency and audio unit properties. I have added calls to AudioUnitGetProperty(au, kAudioUnitProperty_Latency,
kAudioUnitScope_Global, nil, &latency, &outDataSize) to my code to compute the latency introduced by audio effect units on a subgraph. I added print statements which show the latency of the effect chain for a particular subgraph(track) and the starttime set on the AUFilePlayer unit at the top of the subgraph(track).


I have a simple AUGraph with two subgraphs (tracks) that have AUFilePlayer units at the end. Track 0 has an AUTimePitch unit that is programmed to beat match with Track 1. The latency introduced by the TimePitch unit is printed out below. I assume I set the start time of the AUFilePlayers as shown below.

Track 0 Latency := 0.075904
Track 1 Latency := 0.000000
Track 0 startTime is being set to := 0.000000
Track 1 startTime is being set to := 0.075904

Nonetheless, my tracks are not in sync. I believe I am computing the rate parameter correctly for the TimePitch unit. I also have the quality set to max. What else might I be doing wrong?

Thanks again,

Ashley
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


  • Prev by Date: Re: NSSound taper
  • Next by Date: Latency and AUTimePitch
  • Previous by thread: Re: Latency and AUTimePitch
  • Next by thread: Latency and AUTimePitch
  • Index(es):
    • Date
    • Thread