Latency and AUTimePitch
Latency and AUTimePitch
- Subject: Latency and AUTimePitch
- From: Ashley Allen <email@hidden>
- Date: Thu, 12 Jun 2008 16:08:28 -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
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