Sporadic input on iPod Touch 2G
Sporadic input on iPod Touch 2G
- Subject: Sporadic input on iPod Touch 2G
- From: Evan Olcott <email@hidden>
- Date: Thu, 7 May 2009 11:58:21 -0500
Got an issue that seems hardware-ish, but thought I'd throw it out
there and see if anyone else knows about it:
For a strangely regular period (which seems to repeat every few
seconds), there are a handful of buffers we are receiving from the
input AURemoteIO that have a few "silent" samples at the end.
We'll get a notification that there's 1024 samples ready, prepare our
buffer (we don't necessarily zero it), and then call AudioUnitRender
to get the samples from the AURemoteIO. Everything passes with
success, but in these cases the last 2-12 samples are zero. The
waveform shows that the audio isn't *lost*, it just seems that the
audio has been *silenced*. It's as if the render notification was made
a few samples too early or something... and it happens in a strange
rhythmic pattern that repeats every few seconds.
Has anyone else noticed this? We use the same code on the iPhone and
not seen this, and it smells like a hardware issue, whether it's an
audio driver thing, or a race condition thing. It's not regularly
replicable, and we've only seen it on iPod Touch 2G.
TIA
Ev
Technical Knowledge Officer
Head Programmer/Designer
Audiofile Engineering
http://www.audiofile-engineering.com/
_______________________________________________
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