I have used MPMoviePlayerController for playing a movie file in one of my application. It is working fine. I have a requirement where I have to track "for how long the movie is being played by the user?". I am using Omniture for that.
I am stuck at knowing the duration of playing time from start
Thanks
You just need to record when the movie starts :
self.movieStartDate = [NSDate date];
and when the movie has finished (or gets stopped), get how long it's been since then
NSTimeInterval duration = [[NSDate date] timeIntervalSinceDate:self.movieStartDate];
duration will then contain the amount of time since the movie started, in seconds.
But remember that a movie can stop because the app enters the background / becomes inactive so you'll have to listen out for those notifications as well as the ones from the movie player :)
Related
To provide some context, the application I'm working on allows the user to record a series of events along a timeline. One important piece of feedback we received from beta testers was that when the user exits the app while recording they'd like the timer to keep up to date for a set amount of time.
For example if the user has recorded 5 minutes and then leaves the app to check an email for 20 seconds, the timer should be 5:20, but it was actually still 5 minutes.
So we've fixed that - the app now would now show 5:20, and this works in the background.
However we can't figure out a way to stop it after a certain amount of time. A user might want the timer to resume if the app is in the background for a short amount of time, but if you leave it in the background for 30 minutes, the timer will update, and I'd like to be able to give the users an optional cut-off time so that the app pauses after a set amount of time.
I've tried listening out for UIApplicationDelegate notifications, but the problem is I'm looking for a point between applicationDidEnterBackground: and applicationWillTerminate, but there's sadly nothing to cater for my needs there.
To summarise, I'd like to have a grace period of 30-60 seconds from applicationWillResignActive: to determine whether or not to pause the timer, or let it keep going.
Would this be possible?
Thanks in advance
It's generally a bad idea to assume your app will be running in the background.
A better way to think about it IMO would be to set a variable to the current time in applicationDidEnterBackground: and check the time interval to now in applicationWillBecomeActive: :
If the interval is bigger that your grace period, have the time backup to when the app was paused.
If it is smaller, update it as if the app was never in the background.
Use dispatch_after to execute a block of code after a certain number of second:
int64_t delay = 30.0; // In seconds
dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, delay * NSEC_PER_SEC);
dispatch_after(time, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0ull), ^(void){
//DO SOMETHING
});
Swift 3.0 Xcode 8.0 Code sample:
Using delegate methods : applicationWillBecomeActive & applicationWillResignActive to capture the time in between.
OR
let deadlineTime = DispatchTime.now() + .seconds(30)
DispatchQueue.main.asyncAfter(deadline: deadlineTime) {
alert.dismiss(animated: true, completion: nil)
}
Hope this helps.
I want to use NSDate and NSTimer to retrieve the elapsed time between I press a start button and a stop button and present the time in seconds. Then I want to use the time for a calculation. I know how to get the time but it is always in format like this 2013-01-15 14:01:55.369.
How do I subtract one time from the other to get the seconds.
I am not sure how to use NDDate and NSTimer.
This should be really easy but I am sort of stuck here.
//Make two properties `NSDate *startDate, *endDate`
//in the action method of start Button
startDate=[NSDate date];
//in the action method of stop Button
stopDate=[NSDate date];
long elapsedSeconds=[stopDate timeIntervalSinceDate:startDate];
NSLog(#"Elaped seconds:%ld seconds",elapsedSeconds);
Please check my project for stopwatch kind of thing, this may come handy for you
Check this code, most of requirement are solved here.
You can use
- (NSTimeInterval)timeIntervalSinceDate:(NSDate *)date
to get the time interval between the receiver and a given date in seconds.
To get current time from NSData use:
[[NSData data] timeIntervalSince1970];
and just substract it from your NSTime value.
Use timeIntervalSinceDate between the start date and en stop date.
I did not found solution for one issue: how to play mp3 file from offset immideately?
I can only play file then send -(void)seekToTime: but in this case sound begins and interrupts then begins from defined offset.
I tried to apply seekToTime method on ASStatusChangedNotification (in different cases of AudioStreamerState) but there were without result.
upd: I think that may set time offset after the file began streaming (before playing). But how?
Thanks.
What I did was create a method to seek to the desired time that I run after [streamer start]:
while(streamer.bitRate == 0) {
sleep(1);
}
If you're concerned about waiting too long, you can add a time out: either a count of times through the loop, or set a start time and compare it to the current time to break out of the loop.
This blog post has another take:
http://www.saygoodnight.com/2009/08/streaming-audio-to-the-iphone-starting-at-an-offset/
I was able to create the exact functionality I wanted to avaudioplayer and avaudiorecorder but of course experienced latency problems. So after reading pretty much every article on the web and reviewing stacks of sample code, I'm still not sure how to achieve the following:
User chooses to record a sample 2 bars long (4 beats per bar) with a pre-roll/count-in
User clicks record
A metronome starts which counts in 4 beats (accent on the first beat)
The app automatically starts recording on the start of the next bar
The app automatically turns off recording at the end of the 3rd bar (the 2 bars + the pre-roll)
The user can then playback their recording or delete it and start again.
So, with avaudioplayer and avaudiorecorder I simply created a 'caf' using audacity with a metronome set at the correct bpm (bpm is set for the app). I then setup and play the avaudioplayer and using the audiodidfinishsuccessfully delegate method, performed some logic to start the recorder, restart the player, maintain a loop count etc. to turn off recording and audio.
As I mentioned, I was pretty much able to achieve the user experience I am after but the latency problems are not acceptable.
I have been working with audio units and the remote IO and have setup a project with a playback callback and recorder callback etc. but now face the problem of working how to make this work based on the description above. I am trying to work out the following things for starters:
If I create a 1 beat caf file, how could I make use of audio units and remote IO to play x amount of beats and then stop?
How could I do the pre-roll and start the recording callback after 4 beats
Can anyone give me some ideas or point me in the right direction. As I have mentioned, I have already done a stack of research including buying the core audio book, reading every article on atastypixel.com, timbolstad.com etc and trawled through the apple docs.
Thanks in advance for your help.
I start an NSTimer. Use values based on BPM (Beats per Minute) / 60. So if user wants to record a 2 bar file with a count in might do something like this:
//timer interval=100BPM/60secs per minute
timerInterval=100/60;
metroTimer = [NSTimer scheduledTimerWithTimeInterval:timerinterval target:self selector:#selector(blinkMetroLight) userInfo:nil repeats:YES];
- (void)blinkMetroLight
{
if(beatNumber == 0)
{
beatNumber = 1;
}
else if (beatNumber == 5)
{
[self audioProcessorStart];
}
if (beatNumber == 8)
{
[self audioProcessorStop];
[metroTimer invalidate]; metroTimer = nil;
}
beatNumber++
}
I have this situation:
Play (streamed) video, stop by code the video, and then play again.
The problem is that the video is begin from the start and not when i stopped it.
What solution do you now of?
EDIT: As #willcodejavaforfood has pointed out, stop only pauses the movie - calling play should restart where you left off so you shouldn't ever need my answer! Can you post the code you are using so we can see what's going on? Thanks.
If you want it to restart where you left off, you will need to remember how far through the movie you were and set the initialPlaybackTime property before you call play again.
i.e. Store the time when you start the movie
...
[myMoviePlayer start];
startDate = [[NSDate date] retain];
...
Store the time you stop the movie
...
[myMoviePlayer stop];
endDate= [[NSDate date] retain];
...
And when you start playback again, use the difference between these times
...
[myMoviePlayer setInitialPlaybackTime:[endDate timeIntervalSinceDate:startDate]];
[myMoviePlayer play];
...
Sam
PS To force it to start at the start, just set the initial playback time to 0.0
PPS I don't know how accurate NSDate is in milliseconds so you might have to use a better way of working out the current position in the movie :)