Question regarding sound card output latency
Question regarding sound card output latency
- Subject: Question regarding sound card output latency
- From: Danny Gonzalez <email@hidden>
- Date: Thu, 22 Jan 2009 14:16:17 +0000
Although not strictly a question regarding the programming of core
audio, I wonder if any helpful developer could help me answer the
following questions.
When using the AU lab tool that comes with Xcode, it allows you to
see the total output latency for a particular sound device.
For example on my macbook pro with the internal sound device I get
the following figures (when using 64 frame buffers):
Total Output Latency: 114 frames
(Which is made up of the following)
Hardware: 16 Safety Offset: 34 Frames: 64(64 * 1.00)
I was surprised when plugging in an external firewire sound card that
the values for the hardware and safety offset latency were
considerably higher than the built in sound card values.
What determines these values? Is it the hardware manufacturer of the
sound card that sets these values for their particular sound card?
Are firewire cards more prone to higher inbuilt latencies (i.e. the
hardware and safety offset latencies references above) than for
example usb sound cards?
What is the best way to know if a particular sound card will have a
low inbuilt latency short of trying them all and running the AU lab
tool, does any one know of a list of these figures for particular
sound cards?
Thanks for any help
Danny
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