QTCaptureSession latency
QTCaptureSession latency
- Subject: QTCaptureSession latency
- From: Peter Sichel <email@hidden>
- Date: Fri, 29 Mar 2013 19:31:25 -0400
Howdy All,
I'm the developer of Phone Amego which provides Mac-to-Phone integration including the ability to act as Bluetooth Speakerphone.
In iOS6 Apple has enabled "echo cancellation" by default when using Bluetooth HFP devices.
See page 10, https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf
The play-through latency on the Mac appears to be outside the range recognized by the iPhone's EC software, so I'm still hearing echo. Currently I'm using a QTCaptureSession to provide the play through function because Apple's CAPlayThrough sample code is unreliable.
So my questions are:
(1) Is there any way to reduce the latency of a QTCaptureSession?
(2) Is there a more reliable CAPlayThrough sample I might use?
(3) Is there something else I'm overlooking that would prevent the iPhone's EC software from working effectively in this scenario?
Thanks for any pointers or insight.
- Peter Sichel
Sustainable Softworks
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