I made this object to take care of this autofade. You init it with the sound
mc and update interval i ms.
You can then call it with (target volume, length of fade time and delay)
Hope you find it usefull:
class SoundAuto extends Sound{
private var intervalId:Number
private var targetFadeVal:Number
private var startFadeVal:Number
private var fadeStep:Number
private var updateFreq:Number
public var onFadeChange:Function
function SoundAuto(pMc:MovieClip, pUpdateFreq:Number){
super(pMc)
updateFreq = pUpdateFreq
trace("Soundauto constructor")
}
public function fadeTo(pTargetVol:Number, pTime:Number, pDelay:Number):Void{
//clear interval
if (intervalId) {
clearInterval(intervalId)
}
//if delay comeback later
if(pDelay){
intervalId = setInterval(this, "fadeTo", pDelay, pTargetVol, pTime)
return
}
var curVol = this.getVolume()
startFadeVal = curVol
targetFadeVal = pTargetVol
//vol step per ms
fadeStep = (targetFadeVal - curVol)/pTime
intervalId = setInterval(this, "autoFade", updateFreq)
var newVol = Math.round(curVol + (fadeStep * (pTime/updateFreq)))
this.setVolume(newVol)
}
private function autoFade(Void):Void{
var curVol = this.getVolume()
var newVol = Math.round(curVol + (fadeStep * updateFreq))
this.setVolume(newVol)
if (startFadeVal < targetFadeVal){
if (newVol >= targetFadeVal){
fadeComplete()
return
}
} else {
if (newVol <= targetFadeVal){
fadeComplete()
return
}
}
//call onFade function
onFade()
}
private function fadeComplete(Void):Void{
this.setVolume(targetFadeVal)
onFadeChange(this.getVolume()); // execute callback for each change in fade
value, pass newVal to assigned function
clearInterval(intervalId)
intervalId = null
}
private function onFade(Void):Void{
onFadeChange(this.getVolume()); // execute callback for each change in fade
value, pass newVal to assigned function
}
}
Brian
On 11/7/05, eric dolecki <[EMAIL PROTECTED]> wrote:
>
> Basically yes :)
>
> Flash has no notion of decibels - there are probably formulas out there to
> try and approximate that logarithmic curve and apply it to your audio to
> get
> a more natural response. Its a interesting topic at least ;)
>
> e.dolecki
>
> On 11/7/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> >
> > ok. are you talking about decibels being logarithmic and not linear? ie.
> > decibel * 2 doesn't mean "heard volume" * 2.
> >
> > anyway this is getting off topic but i'm sure you're right about this
> > whole thing anyway :)..
> >
> >
> > eric dolecki wrote:
> > > I guess I'm saying that any audio fading up or down should probably
> not
> > be
> > > done linearly ever - while mathematically accurate, to the human ear
> it
> > > doesn't sound right. You'll notice no change and then zoooom... a
> really
> > > quick fade down... when what you wanted was something "even" if you
> know
> > > what I mean.
> > >
> > > e.dolecki
> > >
> > > On 11/7/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > >> so then the code here would work since it's not "linear".
> > >>
> > >> but i'm not sure what you mean by "linear adjustments prove to sound
> > >> highly inaccurate"? in this case i don't think it matters anyway
> since
> > >> it's just a small change of volume and he's probably not coding some
> > >> online dj mixing software. or maybe he is.. :)
> > >>
> > >> andreas
> > >>
> > >>
> > >> Eric E. Dolecki wrote:
> > >>> I've found that linear adjustments prove to sound highly inaccurate
> -
> > or
> > >>> strange. You'll notice no difference, and then the change will be
> > quite
> > >>> abrupt. So be careful with these kinds of things - linear is
> probably
> > >>> not the best way to go.
> > >>>
> > >>> e.dolecki
> > >>>
> > >>>
> > >>> On Nov 7, 2005, at 5:21 AM, [EMAIL PROTECTED] wrote:
> > >>>
> > >>>> If you want to keep things simple, and the volume fade doesn't need
> > to
> > >>>> be linear, couldn't you just run a soundUpdate function and keep
> > track
> > >>>> of the volume in a variable. something like this:
> > >>>>
> > >>>>
> > >>>> var volume = 0;
> > >>>> var destVolume = 100;
> > >>>>
> > >>>> setInterval(soundUpdate, 100);
> > >>>>
> > >>>> function soundUpdate() {
> > >>>> volume += (destVolume - volume) / 20;
> > >>>> track.setVolume(volume);
> > >>>> }
> > >>>>
> > >>>> then when you need the volume to change you could just do:
> > >>>>
> > >>>> on (rollOver) {
> > >>>> destVolume = 0;
> > >>>> }
> > >>>>
> > >>>> then maybe add another interval that sets destVolume back to 100.
> you
> > >>>> could probably replace the "volume += (destVolume .." with
> something
> > >>>> better but at least it should work. :)
> > >>>>
> > >>>> Andreas
> > >>>>
> > >>>> MetaArt wrote:
> > >>>>> In my movie, I have a jingle, that is loaded by this code:
> > >>>>>
> > >>
> >
> code:-----------------------------------------------------------------------
> > >>>>> -------track = new Sound();
> > >>>>> track.loadSound("everybody.mp3", true);
> > >>>>> track.setVolume(0);
> > >>>>> vol = 0;
> > >>>>> fade = setInterval(fadeIn, 100);
> > >>>>> function fadeIn() {
> > >>>>> vol += 1;
> > >>>>> track.setVolume(vol);
> > >>>>> if (vol>=90) {
> > >>>>> clearInterval(fade);
> > >>>>> }
> > >>>>>
> > >>
> >
> };--------------------------------------------------------------------------
> > >>>>> ----
> > >>>>> during playback of this jingle, is possible that happens an event
> (a
> > >>>>> rollOver action) by the user that start the playback of an other
> > >>>>> audio file,
> > >>>>> this time a talkin' human voice.
> > >>>>> The problem is that the jingle cover the voice, or whatever the
> two
> > >>>>> audios
> > >>>>> overlaps.
> > >>>>> Therefore, I want do something that, on rollOver, do the jingle
> has
> > a
> > >>>>> fast
> > >>>>> fadeOut, starting by the volume level where it is.
> > >>>>> How can I obtain this?
> > >>>>> Enrico Tomaselli
> > >>>>> +> web designer <+
> > >>>>> [EMAIL PROTECTED]
> > >>>>> http://www.metatad.it
> > >>>>> _______________________________________________
> > >>>>> Flashcoders mailing list
> > >>>>> Flashcoders@chattyfig.figleaf.com
> > >>>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
> > >>>> _______________________________________________
> > >>>> Flashcoders mailing list
> > >>>> Flashcoders@chattyfig.figleaf.com
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> > >>>
> > >>>
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