I've got an issue with AVPlayer. The case is: I've got one function, that sets the rate of AVPlayer
func applyEffect(effectNumber : Int) {
switch effectNumber {
case 0:
self.AvPlayer.setRate(Float(1.0), time: kCMTimeInvalid, atHostTime: kCMTimeInvalid)
case 1:
self.AvPlayer.setRate(Float(1.5), time: kCMTimeInvalid, atHostTime: kCMTimeInvalid)
case 2:
self.AvPlayer.setRate(Float(0.5), time: kCMTimeInvalid, atHostTime: kCMTimeInvalid)
default:
self.AvPlayer.setRate(Float(1.0), time: kCMTimeInvalid, atHostTime: kCMTimeInvalid)
}
}
For every response I download audio file into AVPlayerItem and save them as array. I've got an observer for item which calls applyEffect function if AVPlayerItem.status is changed, otherwise it applies effect immediately:
if AVCurrentItem.status != AVPlayerItemStatus.readyToPlay {
AVCurrentItem.addObserver(self, forKeyPath: "status", options: NSKeyValueObservingOptions.new, context: nil)
pushMessageLoading()
} else {
self.applyEffect(effectNumber: currentEffect)
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "status" {
popMessageLoading()
self.applyEffect(effectNumber: currentEffect)
AVCurrentItem.removeObserver(self, forKeyPath: "status")
}
}
The AVPlayer property "automaticallyWaitsToMinimizeStalling" is set to false during the initialisation. So, first time audio plays on a requested rate, but all times after - on rate like 1.0. What's the problem?
The root of evil is simple: I've used AVPlayer.play which equals to AVPlayer.rate = 1.0, instead of this you need to use AVPlayer.rate = desired value
Related
Hi I've been working on using Open Tok For a streaming session
I used MPVolumeView to vary system Sound.
Issue: MPVolumeView does work changing system Volume but that doesn't affect my OTSession Volume
Expected: I want to change "outputVolume" of AVAudioSession running with OpenTok
Code:
func startObservingVolumeChanges() {
avAudioSession.addObserver(self, forKeyPath: Observation.VolumeKey, options: [.initial, .new], context: &Observation.Context)
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if context == &Observation.Context {
if keyPath == Observation.VolumeKey, let volume = (change?[NSKeyValueChangeKey.newKey] as? NSNumber)?.floatValue {
print("Volume: \(volume)")
}
} else {
super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
}
}
func stopObservingVolumeChanges() {
avAudioSession.removeObserver(self, forKeyPath: Observation.VolumeKey, context: &Observation.Context)
}
As soon as I change volume using iOS Volume buttons "Volume does get print from 0 to 1 range"
when I change value using Slider "Volume does get print from 0 to 1 range" but doesn't lower the sound of Session
Please help.
Discussed with OpenTok Developers. This is not supported attaching screenshot for same,
I had asked this question regarding some Apple code and making it work.
I have looked here but the answer there does not solve my problem
Although I solved that problem I am not getting the bellow error on the line shown.
Thread 5: Simultaneous accesses to 0x10b883638, but modification requires exclusive access
private var playerItemContext = 0
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
// Only handle observations for the playerItemContext
print("jdslfhjkfdhaldfahjkflhajfldashkjfdshkjlas")
guard context == &playerItemContext else {
super.observeValue(forKeyPath: keyPath, of: object,change: change, context: context)
return
}
...
Why is this and how can I fix this?
Try this code:
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
// Only handle observations for the playerItemContext
guard context == &P2SheetViewController.playerStatusContext else {
super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
return
}
if keyPath == #keyPath(AVPlayer.status) {
let status: AVPlayer.Status
if let statusNumber = change?[.newKey] as? NSNumber {
status = AVPlayer.Status(rawValue: statusNumber.intValue)!
} else {
status = .unknown
}
//Switch over status value
switch status {
case .readyToPlay:
break
// Player item is ready to play
case .failed:
print(".UKNOWN")
break
// Player item failed. See error.
case .unknown:
print(".UKNOWN")
break
// Player item is not yet ready.
#unknown default: //new jul 17
print(".UKNOWN")
break
}
}
}
Hope it helps
I need to observe AVPlayer.status change.
I have an AVPlayer instance and a context variable
private var lastPlayer : AVPlayer?
private var playerStatusContext = 0
After I've set up the AVPlayer instance I add an observer like so:
// KVO status property
self.lastPlayer!.addObserver(self, forKeyPath: "status", options: [.new, .initial], context: &playerStatusContext)
Then I've overridden observeValue function like so:
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?)
{
let status : AVPlayerStatus? = change?[.newKey] as? AVPlayerStatus
if(status != nil && context == &playerStatusContext)
{
// DO MY STUFF
}
}
The problem is that change is either 0 key/value dictionary or some (whatever that means) and my local status constant is always nil, hense I can't do my stuff.
Maybe I am converting change to AVPlayerStatus wrongly? Please help. Thanks.
Well, it seems like cast like this
let status : AVPlayerStatus? = change?[.newKey] as? AVPlayerStatus
does not work. The app crashed when tried checking change for nil and then force unwrap it. Using raw values helped:
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?)
{
// Check status
if keyPath == "status" && context == &playerStatusContext && change != nil
{
let status = change![.newKey] as! Int
// Status is not unknown
if(status != AVPlayerStatus.unknown.rawValue)
{
// DO STUFF!!!
}
}
}
I am not sure this is the best way however.
I'm using the AVPlayer class to read streams.
I have to monitor playback.
Here is my question : Is it possible to detect when the player is stopped by the user ?
I looked at MPMoviePlayerController. If the user stopped the video, this controller sends a notification : MPMovieFinishReasonUserExited. Is there an equivalent ?
You can monitor rate property by adding observer on the player for key rate.
A value of 0.0 means pauses the video, while a value of 1.0 play at the natural rate of the current item.
Apple documentation and this topic.
Hope this helps.
here's the swift 3 code for #Thlbaut's answer
self.avPlayer?.addObserver(self, forKeyPath: "rate", options: NSKeyValueObservingOptions(rawValue: 0), context: nil)
then
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "rate" {
if let playRate = self.avPlayer?.rate {
if playRate == 0.0 {
print("playback paused")
} else {
print("playback started")
}
}
}
}
I'm searching for a way to get notified the exact moment when AVPlayer starts playing. There's the "rate" property, but currently I am checking it periodically with an NSTimer to get updates.
I tried KVO, but apparently it's not KVO compliant.
I know that there are events when the player ENDED. But i'm talking about pause here.
I also KVO subscribed to AVPlayerItem's "status", but it's showing me when the HTTP asset has finished caching, no play/pause. I also started collecting all calls of play/pause, requesting an instant UI update afterwards, but it takes some more runloops before AVPlayer really starts playing. I'd just love to update my button instantly.
Why do you say that "rate" is not KVO complaint?
It works for me.
Here is what I did:
- (void)viewDidLoad
{
...
[self.player addObserver:self forKeyPath:#"rate" options:0 context:nil];
}
And then:
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([keyPath isEqualToString:#"rate"]) {
if ([self.player rate]) {
[self changeToPause]; // This changes the button to Pause
}
else {
[self changeToPlay]; // This changes the button to Play
}
}
}
For iOS 10 onwards You can check new property of AVPlayer timeControlStatus.
if(avPlayerObject.timeControlStatus==AVPlayerTimeControlStatusPaused)
{
//Paused mode
}
else if(avPlayerObject.timeControlStatus==AVPlayerTimeControlStatusPlaying)
{
//Play mode
}
AVPalyer as default observer to track the current duration of the video ,when you pause or resume the video you can get paused time by using one global variable (inside observer update that variable)
CMTime interval = CMTimeMake(1, 1);
//The capture of self here is coming in with your implicit property access of self.currentduration - you can't refer to self or properties on self from within a block that will be strongly retained by self.
//You can get around this by creating a weak reference to self before accessing timerDisp inside your block
__weak typeof(self) weakSelf = self;
self.timeObserverToken = [_player addPeriodicTimeObserverForInterval:interval queue:NULL usingBlock: ^(CMTime time)
{
_currentDuration = (int)CMTimeGetSeconds (_player.currentTime);
if(!_isPlaying)
{
_pausedDuration = _currentDuration;
}
}
If you're targeting iOS 13 and up, you can pull this off elegantly using Combine:
cancellable = myAVPlayerInstance.publisher(for: \.timeControlStatus)
.sink { [unowned self] status in
...
}
where status is any case of AVPlayer.TimeControlStatus
player = AVPlayer(url: URL(fileURLWithPath: path))
player.addObserver(self, forKeyPath: "rate", options: NSKeyValueObservingOptions.new, context: nil)
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "rate" {
if player.rate > 0 {
print("video started")
}
}
}
in swift
Add an observer to your AVPlayer object's rate value:
player.addObserver(self, forKeyPath: "rate", options: [], context: nil)
And override the method that will be called when the rate changes:
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "rate", let player = object as? AVPlayer {
if player.rate == 1 {
print("Playing")
} else {
print("Paused")
}
}
}
Need to add an observer to AVPlayer object's rate value:
player?.addObserver(self, forKeyPath: "rate", options: NSKeyValueObservingOptions.new, context: nil)
Override below method to observe changes in rate property
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "rate" {
if let status = player?.timeControlStatus {
switch status{
case .paused:
//Paused mode
print("paused")
case .waitingToPlayAtSpecifiedRate:
//Resumed
print("resumed")
case .playing:
//Video Ended
print("ended")
#unknown default:
print("For future versions")
}
}
}
}