iOS Callbacks

[Brittgriscom]

How do I do callbacks in iOS? I need the words to change color as the text is read in my storybook app. Do I need to send in time for each word?

[Klaus]

Hi Britt,

as Bernd already explained to you in another thread, "callbacks" are a special PLAYER OBJECT feature
(maybe even QuickTime only?), "player objects" (like in the desktop versions) are NOT supported (yet?)
on iOS, so you, you will need to use "send... in ...".


Best

Klaus

[Brittgriscom]

Can I use mpmovieplayercontroller to play audio files?

[Klaus]

Hi Britt,

I doubt, since the docs only read "video playback" for this.
Why don't you test this?


Best

Klaus

[Brittgriscom]

Apparently you can, and it does play mp3s, but it doesn't have anything like callbacks as far as I can tell.

According to the iOS reference documents, it uses QuickTime so maybe callbacks are possible with it.

[Klaus]

Hi Britt,

Apparently you can, and it does play mp3s, but it doesn't have anything like callbacks as far as I can tell.

erm, what part of "callbacks on iOS are not supported (yet)" did you not understand?

According to the iOS reference documents, it uses QuickTime so maybe callbacks are possible with it.

Well, fine, please tell us when your tests are successful!


Best

Klaus

[Nikovash]

Well I am not entirely sure they could be called callbacks, but there are supposed to be messages that the MPMoviePlayerController is supposed to be sending, but doesn't

IE:
playerPropertyAvailable
playerProgressChanged
playerEnterFullscreen
playerLeaveFullscreen
playerMovieChanged
playerFinished
playerStopped
playerError

[bn]

Hi Nikovash,

I tried the playerFinished and the playerStopped callback.

The playerFinished callback is sent. The playerStopped callback according to the iOS documentation is sent when "The content finished playing through due to a user exit." I could not trigger that callback.

iphoneControlGet sMovieID, playbackstate

gives you the information about the state of the movie.(Button What is up?")

All handling of the movie is in the card script, the buttons just call a handler in the card script to play, pause, stop etc.

I have set up a small stack that illustrates the various possibilities. It includes a small sample movie, the path in the Standalone Application Settings should work since it the movie is in the same folder, but in case it does not work you would have to reasign the path to the movie in the Standalone Application Settings -> Copy Files

Kind regards

Bernd

[Brittgriscom]

I don't see how I would use this to change the color of my words as they were read.

[bn]

Hi Britt,

it is not meant in itself to give you the callbacks you need. You would still have to roll your own. The only advantage of using the movie player would be that when the user pauses the player you can get the currentTime and know where you are when you resume the callbacks. That was the whole idea of pointing you to this method.
You could do a send in time handler that has a counter (script local variable) to tell you how many times it has been run and triggered a message from a list, one callback per line with the time(ms) as item 2, optionally an item 3 the relative time (ms) to next callback . Then you have the relative times in millseconds and you stopped after the fifth callback at 5000 milliseconds and the user stopped at 5500 milliseconds (the currentTime) then you would resume your sound file and send the next send in time in 500 milliseconds, assuming a regular intervall of 1000 milliseconds between callbacks.

This is a very rough outline of how it could be done. There is enough to take into consideration but if you get it going you would have a pause/resume function in your app.

Kind regards

Bernd