Hi Dan Thanks for the clarification.
Best regards Eric Gorouben > Le 24 avr. 2015 à 20:15, Dan Klingler <[email protected]> a écrit : > >> How can I estimate the latency? > > > Do you want to estimate the end-to-end latency from the application to the > speaker, or just figure out what set your AudioServerPlugin’s > kAudioDevicePropertyLatency to? > > For output, kAudioDevicePropertyLatency should be the time between when audio > is “consumed” by the AudioServerPlugin and when it hits the speaker. > > When an application receives an audio callback with a particular > AudioTimeStamp, the HostTime (in the future) in that AudioTimeStamp says when > the beginning of that block of audio will be consumed by the device (which is > based on the ZeroTimeStamps provided by the device). The audio system’s > choice of this HostTime has already accounted for things like IOBufferSize, > device safety offset, etc. The device's kAudioDevicePropertyLatency should > describe the additional delay from the consumption of the samples to hearing > it at the speaker. > > Dan > > >> On Apr 24, 2015, at 3:17 AM, Eric Gorouben <[email protected]> wrote: >> >> Hi, >> >> I'm a bit confused with kAudioDevicePropertyLatency. >> The latency depends (among others) on the buffer frame size. However, an >> audio server plugin constantly adjusts the buffer size in a best effort to >> satisfy all clients. The "inIOBufferFrameSize" is pretty unpredictable. >> How can I estimate the latency? >> >> Thanks >> Eric Gorouben >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Coreaudio-api mailing list ([email protected]) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/coreaudio-api/dklingler%40apple.com >> >> This email sent to [email protected] > _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com This email sent to [email protected]
