objectiveC/CMTime - convert AVPlayer.duration to milliseconds

Question

I'm creating an app for playing a ringtone and I'd want to know the current time in milliseconds of the played ringtone every time.

CMTime cTime = player_.currentTime; float currentTime = cTime.value / cTime.timescale;

That currentTime here gets the value in seconds. How can I get the exact currentTime value but in milliseconds?

score 59 · Accepted Answer · edited Dec 31 '15 at 10:44

59

There is a way to get current times in seconds, you can take 1000 times that and ther you have your miliseconds:

Float64 dur = CMTimeGetSeconds([player currentTime]);
Float64 durInMiliSec = 1000*dur;

Sadly you will have to use it as a float or Float64 you can't use that result as a CMTime

edited Dec 31 '15 at 10:44

Praveenkumar

24,084
23
95
173

answered Jul 11 '11 at 19:06

Samssonart

3,443
3
31
41

But how can we pass this Float value in the following function? - (BOOL)insertTimeRange:(CMTimeRange)timeRange ofTrack:(AVAssetTrack *)track atTime:(CMTime)startTime error:(NSError **)error; Because it takes CMTime as a parameter. – Developer Dec 27 '12 at 12:15
You can use the original time (in seconds) and create a CMTime with that value using the CMTimeMake function. – Samssonart Jan 15 '13 at 17:26
This decade-old answer still holds test of time. Much appreciated. Helped us solve an issue losing fraction of second in this [PR](https://github.com/luanpotter/audioplayers/pull/421). – om-ha Feb 17 '20 at 22:36

score 6 · Answer 2 · edited Dec 03 '15 at 19:30

6

I think that the accepted answer loses detail. A more accurate way to get milliseconds would be the following:

let seconds : Double = Float64(time.value * 1000) / Float64(time.timescale)

If you convert to seconds first you'd lose precision.

edited Dec 03 '15 at 19:30

Siyual

16,415
8
44
58

answered Dec 02 '15 at 04:52

Trevis Thomas

353
3
6

1

This is incorrect. From Apple's documentation on CMTimeGetSeconds "The division is done in Float64, so the fraction is not lost in the returned result." – amergin Aug 28 '17 at 17:04

score 2 · Answer 3 · answered May 12 '11 at 17:28

2

CMTime.value and CMTime.timescale are both integers, so judging by your code, the result gets rounded and you don't get a precise timestamp. Try CMTimeGetSeconds instead.

answered May 12 '11 at 17:28

Alex Chugunov

728
5
10

objectiveC/CMTime - convert AVPlayer.duration to milliseconds

3 Answers3