Re: CoreAudio: Calculate total latency between input and output with kAudioUnitSubType_VoiceProcessingIO
Re: CoreAudio: Calculate total latency between input and output with kAudioUnitSubType_VoiceProcessingIO
- Subject: Re: CoreAudio: Calculate total latency between input and output with kAudioUnitSubType_VoiceProcessingIO
- From: Arshia Cont via Coreaudio-api <email@hidden>
- Date: Wed, 22 Jan 2020 22:31:36 +0100
We also use a simple measurement mechanism which is fine for a user-facing
situation.
However, what Brian described remains a problem: Doing such measurements when
user is using a Headset doesn’t make sense!
This is especially problematic for Bluetooth devices: I haven’t figured out a
way to detect whether the device is a Headset or not! Has anyone figured out a
way to do this? AVAudioSession properties do not seem to help.
Arshia
> On 21 Jan 2020, at 23:57, Paul Davis via Coreaudio-api
> <email@hidden> wrote:
>
>
>
> On Tue, Jan 21, 2020 at 3:36 PM Brian Schachter via Coreaudio-api
> <email@hidden <mailto:email@hidden>> wrote:
>
>
> > The most reliable way to do this is to actually measure it. Not necessarily
> > the most convenient, however. In Ardour we make this measurement optional -
> > users will get better capture alignment if they do it
>
> Do you play a metronome out of the speaker (output) while simultaneously
> recording it with the mic (input) and afterwards look at the peaks in the
> recorded data? If so, is this method of measuring impossible if the user is
> wearing headphones? When the output is headphones... the mic won't be able to
> pick it up.
>
> Correct. If you want to do the most accurate measurement, you need to be able
> to detect and measure the signal via a "loopback" signal flow. That's why I
> noted "not necessarily the most convenient".
>
>
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