AVPlayer - Add Seconds to CMTime

Question

How can I add 5 seconds to my current playing Time?
Actually this is my code:

CMTime currentTime = music.currentTime;

I can´t use CMTimeGetSeconds() , because I need the CMTime format.

Thank you for your answers...

EDIT: How can I set a variable for CMTime?

Polyhydroxy

Answer 1

Here is one way:

CMTimeMakeWithSeconds(CMTimeGetSeconds(music.currentTime) + 5, music.currentTime.timescale);

Botvinnik

When I replace the '+ 5' with '- 5' it is not working...Do you know whats wrong? – Nostoc

What is the current time in seconds? Perhaps the number goes negative? – Botvinnik

This is my code: CMTime currentTime = music.currentTime; float currentTimeInt = CMTimeGetSeconds(currentTime); if (currentTimeInt > 5) { CMTime newTime = CMTimeMakeWithSeconds(CMTimeGetSeconds(music.currentTime) - 5, music.currentTime.timescale); [music seekToTime:newTime]; } else { NSLog(@"error"); } – Nostoc

...EDIT: Missed your if statement. Let me check again. Was it working with + 5 but not working with - 5? – Botvinnik

The value doesn´t change whit the minus. I left the if statement out – Nostoc

I see nothing wrong with your code. You'll get an error in your log if currentTimeInt is less or equal to zero. You sure this is not the issue? – Botvinnik

No, so what I mean is that if your currentTime is 5 seconds or less you will trigger your else block which spits out an error message in the log even though you don't actually have an error. The correct way would be to do the if statement without the else block. – Botvinnik

Now the value changes :) but I can´t use it with seekToTime: (nothing happens when pressed). Do you know why? – Nostoc

Not from the top of my head. I suggest posting a new question for that. Good luck. – Botvinnik

Answer 2

elegant way is using CMTimeAdd

CMTime currentTime = music.currentTime;
CMTime timeToAdd   = CMTimeMakeWithSeconds(5,1);

CMTime resultTime  = CMTimeAdd(currentTime,timeToAdd);

//then hopefully 
[music seekToTime:resultTime];

to your edit: you can create CMTime struct by these ways

CMTimeMake
CMTimeMakeFromDictionary
CMTimeMakeWithEpoch
CMTimeMakeWithSeconds

more @: https://developer.apple.com/library/mac/#documentation/CoreMedia/Reference/CMTime/Reference/reference.html

Lomasi

'AVPlayer' may not respond to 'setCurrentTime' – Nostoc

Sending 'CMTime' to parameter of incompatible type 'NSTimeInterval' (aka 'double') – Nostoc

maybe you should use [music seekToTime: resultTime] – Lomasi

Answer 3

In Swift:

private extension CMTime {

    func timeWithOffset(offset: TimeInterval) -> CMTime {

        let seconds = CMTimeGetSeconds(self)
        let secondsWithOffset = seconds + offset

        return CMTimeMakeWithSeconds(secondsWithOffset, preferredTimescale: timescale)

    }

}

Orville

Answer 4

Swift 4, using custom operator:

extension CMTime {
    static func + (lhs: CMTime, rhs: TimeInterval) -> CMTime {
        return CMTime(seconds: lhs.seconds + rhs,
                      preferredTimescale: lhs.timescale)
    }

    static func += (lhs: inout CMTime, rhs: TimeInterval) {
        lhs = CMTime(seconds: lhs.seconds + rhs,
                      preferredTimescale: lhs.timescale)
    }

}

Hazzard