iOS PictureInPicture with AVSampleBufferDisplayLayer seek forward disabled

Question

I have an AvPictureInPictureController that should display an image while playing audio. I have created a AVSampleBufferDisplayLayer that has a CMSampleBuffer with an image and the two necessary delegates AVPictureInPictureSampleBufferPlaybackDelegate & AVPictureInPictureControllerDelegate I am setting pictureInPictureController.requiresLinearPlayback = false so the picture in picture window is showing the seek back, play/pause and seek forward buttons. Here is my function for the time range:

func pictureInPictureControllerTimeRangeForPlayback(_ pictureInPictureController: AVPictureInPictureController) -> CMTimeRange { let duration = player.state.duration if duration == 0 { return CMTimeRange(start: .negativeInfinity, duration: .positiveInfinity) } return CMTimeRange( start: CMTime( seconds: .zero, preferredTimescale: 10_000 ), duration: CMTimeMakeWithSeconds( duration, preferredTimescale: 10_000 ) ) }

My problem is, that seek forward is disabled on picture in picture. Seeking back is working just fine, also play/pause. But seek forward is disabled and I haven't figured out why this is happening. Any thoughts?

I tried to calculate the CMTimeRange differently but it is always the same behaviour.

ksysha · Accepted Answer · 2023-01-31 13:27:41Z

I found this project https://github.com/getsidetrack/swiftui-pipify/blob/main/Sources/PipifyController.swift#L250 where the CMTimeRange is calculated from the CACurrentMediaTime() and although I am not sure why there is such a big time range calculated (like taking one week in seconds) CACurrentMediaTime() was the right hint.

So this is how the the pictureInPictureControllerTimeRangeForPlayback looks like now:

func pictureInPictureControllerTimeRangeForPlayback( _ pictureInPictureController: AVPictureInPictureController ) -> CMTimeRange { if player.duration == 0 { return CMTimeRange(start: .negativeInfinity, duration: .positiveInfinity) } let currentTime = CMTime( seconds: CACurrentMediaTime(), preferredTimescale: 60 ) let currentPosition = CMTime( seconds: state.position, preferredTimescale: 60 ) return CMTimeRange( start: currentTime - currentPosition, duration: CMTime( seconds: player.duration, preferredTimescale: 60 ) ) }

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