How to pass float value where datatype is CMTime?

iphone ios audio mixing
Developer picture Developer · Dec 27, 2012 · Viewed 8.4k times · Source

I am creating an application in which I have to mix the songs. I have accomplished this but the problem is when I am using the following function.

- (BOOL)insertTimeRange:(CMTimeRange)timeRange ofTrack:(AVAssetTrack *)track atTime:(CMTime)startTime error:(NSError **)error;

I have to pass CMTime type value in the atTime parameter but it doesn't takes Float value and I have to add the another song at some floating point value. Is it possible any how?

Answer

user529758 picture user529758 · Dec 27, 2012

You can use one of the CMTimeMake...() functions. You have to supply a time point and a timescale value. The former is a 64-bit integer; you can just truncate or round your float to convert it to an integer, or use a necessarily high timescale:

CMTime tm = CMTimeMake(53425, 10000); // @ 5.3425 sec

Related questions

How do I record audio on iPhone with AVAudioRecorder?

Now that iPhone 3.0 SDK is public, I think I can ask this question for those of you that have already been playing with the 3.0 SDK. I want to record audio in my application, but I want to use AVAudioRecorder and …

Read More
How to get audio volume level, and volume changed notifications on iOS?

I'm writing a very simple application that plays a sound when pressing a button. Since that button does not make a lot of sense when the device is set to silence I want to disable it when the device's audio …

Read More
How can I record a conversation / phone call on iOS?

Is it theoretically possible to record a phone call on iPhone? I'm accepting answers which: may or may not require the phone to be jailbroken may or may not pass apple's guidelines due to use of private API's (I don't …

Read More