All That Entertainment Technology

Do you know that Macromedia Flash only suppport maximum 8 channel sounds? For instance, if your current sound channel reachs maximum limit, Flash cannot play new sound unless one of the play sound ends. So, I made SoundController class, which manages sound channel. When current channel get to maximum sound limit, SoundController class stop the oldest sound, thus you can play the new sound. The mechanism of this class is similar to “Queue” structure. When you add a new sound, the oldest sound pops.

Here is a structure of the class:

1. soundcontroller.maxSound : Limit of flash. Fixed value. Default is 8.
2. soundcontroller.BindInst : Interface with instrument.
3. soundcontroller.soundQueue : Queue structured Array. Playing sounds are stored in this array.
4. soundcontroller.Play(soundID) : Play a sound. And manage sound queue automatically.

Here is the full source:

import hirihiri2.meloboard.instrument; class hirihiri2.meloboard.soundcontroller { var maxSound:Number = 8; public var BindInst:instrument; public var soundQueue:Array = new Array(); function SetInst(InstName:instrument) { BindInst = InstName; } function Play(sndPitch:Number) { var i; this.RefreshQueue(); // Delete ended sound from sound queue for (i=0;i&ltthis.soundQueue.length;i++) { if (Number(this.soundQueue[i])==sndPitch) { this.BindInst.InstArray[Number(this.soundQueue.splice(i))].stop(); // If the same sound is found in sound queue, sound controller stop it first. } } this.soundQueue.push(sndPitch); // Push soundID to sound queue while (this.soundQueue.length&gtthis.maxSound) { this.BindInst.InstArray[Number(this.soundQueue.shift())].stop(); // Stop the oldest sound if total channel reaches maximum limit } this.BindInst.InstArray[sndPitch].start(0); // Play sound } function RefreshQueue() { for (var i=0;i&ltthis.soundQueue.length;i++) { if (this.BindInst.InstArray[Number(this.soundQueue[i])].position==this.BindInst.InstArray[Number(this.soundQueue[i])].duration) this.soundQueue.splice(i); } }

This entry was posted on Wednesday, May 18th, 2005 at 1:48 pm and is filed under Flash Tips. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.