CODEWITHSUNDEEP
iosaudiocore-audioaudioqueueaudioqueueservices
Krishnamurthy Hegde
Krishnamurthy Hegde

Reputation: 43

Synchronization of Multiple Audio Queues

The Audio Queue Documentation from Apple claims to have "Additional advanced features support scheduled playback and synchronization of multiple audio queues". However, no documentation for the same is found anywhere on the net.

I have three Audio Queues, that need synchronous playback/stop/pause/resume. Any pointers is appreciated.

Upvotes: 1

Views: 313

Answers (1)

Gordon Childs
Gordon Childs

Reputation: 36169

There are many intriguing looking functions that use AudioTimeStamp in the AudioQueue header file.

In particular AudioQueueStart has an AudioTimeStamp parameter called inStartTime. Maybe you could use the mHostTime field to specify the host machine's time base, mach_absolute_time which you ought to be able to use to synchronise multiple audio queues.

Then I guess you'd use the inStartTime argument in AudioQueueEnqueueBufferWithParameters to queue your buffers at the right time. Not sure how you'd synchronise stop...

Personally, I've found AudioQueues to generate more heartache than LPCM, so I'd mix and output the three audio streams myself using a remote io audio unit (or the modern equivalent) because you get synchronised play,resume/stop,pause for free.

Upvotes: 1

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