AudioOutputUnitStart takes time

Posted by tokentoken on Stack Overflow See other posts from Stack Overflow or by tokentoken
Published on 2010-03-24T21:19:55Z Indexed on 2010/03/24 21:23 UTC
Read the original article Hit count: 155

Filed under:

core-audio

|

iphone

Hello,

I'm making an iPhone game application using Core Audio, Extended Audio File Services.

It works OK, but when I first call AudioOutputUnitStart, it takes about 1-2 seconds. After the second call, no problem. For a game application, 1-2 seconds is very noticeable. (I tested this on iPhone simulator, and iPhone 3GS)

Also, if I leave the game for about 10 seconds, first call of AudioOutputUnitStart also takes time.

Maybe I have to call AudioOutputUnitStart beginning of the application to prevent the start-up time?

© Stack Overflow or respective owner

Related posts about core-audio

iPhone SDK: Change playback speed using core audio AVAudioPlayer

as seen on Stack Overflow - Search for 'Stack Overflow'
I'd like to be able to play back audio I've recorded using AVAudioRecorder @ 1.5x or 2.0x speed. I don't see anything in AVAudioPlayer that will support that. I'd appreciate some suggestions, with code if possible, on how to accomplish this with the iPhone 3.x SDK. I'm not overly concerned with lowering… >>> More
Finding out estimated duration of a stream using Core Audio

as seen on Stack Overflow - Search for 'Stack Overflow'
I am streaming a MP3 over network using custom feeding code, not AVAudioPlayer (which only works with URLs) using APIs like AudioFileStreamOpen and etc. Is there any way to estimate a length of the stream? I know that I can get a 'elapsed' property using: if(AudioQueueGetCurrentTime(queue.audioQueue… >>> More
Core-audio - constructing an AudioBufferList

as seen on Stack Overflow - Search for 'Stack Overflow'
The definition of AudioBufferList looks weird to me… i guess my C is not so good struct AudioBufferList { UInt32 mNumberBuffers; AudioBuffer mBuffers[kVariableLengthArray]; }; typedef struct AudioBufferList AudioBufferList; Why AudioBuffer mBuffers[kVariableLengthArray]; and not AudioBuffer… >>> More
Core Audio - CARIngBuffer

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, Im looking at using the CARingBuffer in iPhone SDK 3.1 Developer\Extras\CoreAudio\PublicUtility, however was a little puzzled about some of its methods. Firstly this will only make sense really to anyone who's used this class For example the GetTimebounds,SetTimeBounds, ClipTimeBounds functions… >>> More
Using Core Audio to extract floats from AIFF

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a way using Core Audio on OS X to extract a set of frames in an AIFF file into an array of 32-bit floats suitable for performing an FFT on? >>> More

Related posts about iphone

iphone - direct link to iPhone review form from inside iphone

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to link directly to the review link of one of my Apps. I know that it is possible because Appirater did it in the past, but some change in iTunes turned the API down. Appirater uses this URL NSString *templateReviewURL = @"itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews… >>> More
Buy iPhone 4 Without Contract: $599 (AT&T) and $699 (Verizon)

as seen on Tech Dreams - Search for 'Tech Dreams'
Purchasing iPhone without a contract is a good option when you are planning to gift it to someone or going to use it outside US. Both AT&T and Verizon lets you iPhone 4 without a contract but this information is buried deep under blurred text in FAQs and agreements. Here is the pricing… >>> More
Is it possible to download and run IPhone apps on an IPhone emulator

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am tasked to provide an IPhone client app for our SaaS website. I have never written an IPhone application, nor do I have an IPhone at the moment. Before I can decide whether or not I want to do this myself or outsource this, I'd like to try a few apps myself to get a feeling for the UI. Is… >>> More
iPhone web app from dashcode rss feed template works deployed on simulator but not on iphone

as seen on Stack Overflow - Search for 'Stack Overflow'
iPhone web app from dashcode rss feed template works deployed on simulator but not on iphone. The web app is deployed at; http://www.alila.se/wordpress/index.html If i run the simulator and enter that adress, it fetches the rss feed and displays it. Everything fine. When i enter the adress into… >>> More
Problem running iPhone application on iPhone from Xcode (and in Instruments)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I have a problem running one application on the iPhone from Xcode (or Instruments). When I try to run the app I get the error message Failed to upload XXX.app in the bottom left corner of Xcode. The strange thing is it actually uploaded the app to the iPhone but it doesn't start it (after this… >>> More