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oliversen
oliversen
Inspiring
January 16, 2018
Answered

1061: Call to a possibly undefined method start through a reference with static type flash.media:SoundChannel

  • January 16, 2018
  • 2 replies
  • 5623 views

I have a problem with function start sound(startstart). I cant compile the program before getting an error.

var channel:SoundChannel = new SoundChannel();

I have 3 similar functions as NRKP1

mcButikker.btnNRKP1.addEventListener(MouseEvent.CLICK, NRKP1); 

function NRKP1(e:MouseEvent){ 

     var SoundNRKP1:Sound = new Sound(); 
     channel.stop();
     var req:URLRequest = new URLRequest("http://lyd.nrk.no/nrk_radio_p1pluss_mp3_m"); 
     SoundNRKP1.load(req);
     channel = SoundNRKP1.play(); 
}

When I added start/stop buttons for starting and stopping I got the error. But when I dont have them, and choose one of the 3 functions, it will stop the sound, and play another sound. "channel.start(); is the issue here. I have tried several ways around this but nothing seems to work.

btnStart.addEventListener(MouseEvent.CLICK, startstart);  

function startstart(e:MouseEvent){ 
     channel.start(); 
}    

btnStopp.addEventListener(MouseEvent.CLICK, stopstop); 
 
function stopstop(e:MouseEvent){ 
     channel.stop();  
}
This topic has been closed for replies.
Correct answer JoãoCésar17023019

Here is the complete code for reference:

import flash.events.MouseEvent;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.media.SoundTransform;
import flash.net.URLRequest;
import flash.display.SimpleButton;
import flash.events.Event;
var bgmList:Vector.<String> = new <String>
[
    "https://website.com/Beat_Your_Competition.mp3", 
    "bgm/Bounce_House.mp3", 
    "bgm/Chess_Pieces.mp3"
];
var sound:Sound;
var sChannel:SoundChannel;
var sTransform:SoundTransform;
var channelPosition:Number = 0;
var playing:Boolean = false;
var paused:Boolean = false;
var currentSound:int = -1;
function onMouse(e:MouseEvent):void
{
    if (e.type == MouseEvent.CLICK)
    {
        if (e.currentTarget.parent == soundButtons)
            changeSound(e.currentTarget as SimpleButton);
        else if (e.currentTarget.parent == controlButtons)
        {
            if (e.currentTarget == controlButtons.pauseButton)
                pauseSound();           
            else if (e.currentTarget == controlButtons.playButton)
                playSound(channelPosition);
            else if (e.currentTarget == controlButtons.stopButton)
                stopSound();
        }
       
        controlStates();
    }
}
function changeSound(button:SimpleButton):void
{
    currentSound = int(button.name.slice(5, button.name.length));
    channelPosition = 0;
   
    nowPlaying.text = "Current song = " + bgmList[currentSound].split("/").pop();
   
    if (playing)
    {
        sChannel.stop();
        playSound(channelPosition);       
    }           
}
function pauseSound():void
{
    if (playing)
    {
        channelPosition = sChannel.position;
        sChannel.stop();
        playing = false;
        paused = true;
    }   
}
function playSound(start:Number = 0, volume:Number = 1, loops:int = 0):void
{   
    if (currentSound == -1)
        return;
   
    if (sChannel)
        sChannel.stop();
   
    sound = new Sound();   
    sTransform = new SoundTransform();   
    sound.load(new URLRequest(bgmList[currentSound]));
    sChannel = sound.play(start, loops);   
    sTransform.volume = volume;
    sChannel.soundTransform = sTransform;
    playing = true;
    paused = false;
}
function stopSound():void
{
    if (sChannel)
    {
        sChannel.stop();
        channelPosition = 0;
        playing = false;
        paused = false;
    }
}
function controlStates():void
{
    if (playing)
    {
        progress.visible = true;
        bar.visible = true;
        controlButtons.pauseButton.alpha = 1;
        controlButtons.stopButton.alpha = 1;
    }
    else
    {
        controlButtons.pauseButton.alpha = 0.35;
       
        if (!paused)
        {
            progress.visible = false;
            bar.visible = false;
            controlButtons.stopButton.alpha = 0.35;
        }
    }
}
function enterFrameHandler(e:Event):void
{
    if (playing)
    {
        if (sound.length > 0)
            progress.scaleX = sChannel.position / sound.length;
    }       
}
function start():void
{
    stop();
   
    for (var i:int = 0, total:int = soundButtons.numChildren; i < total; i++)
        soundButtons.getChildAt(i).addEventListener(MouseEvent.CLICK, onMouse);
   
    for (i = 0, total = controlButtons.numChildren; i < total; i++)
        controlButtons.getChildAt(i).addEventListener(MouseEvent.CLICK, onMouse);
   
    stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
   
    nowPlaying.text = "Current song = none."
   
    controlStates();
}
start();

2 replies

JoãoCésar17023019
Community Expert
JoãoCésar17023019Community ExpertCorrect answer
Community Expert
January 17, 2018

Here is the complete code for reference:

import flash.events.MouseEvent;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.media.SoundTransform;
import flash.net.URLRequest;
import flash.display.SimpleButton;
import flash.events.Event;
var bgmList:Vector.<String> = new <String>
[
    "https://website.com/Beat_Your_Competition.mp3", 
    "bgm/Bounce_House.mp3", 
    "bgm/Chess_Pieces.mp3"
];
var sound:Sound;
var sChannel:SoundChannel;
var sTransform:SoundTransform;
var channelPosition:Number = 0;
var playing:Boolean = false;
var paused:Boolean = false;
var currentSound:int = -1;
function onMouse(e:MouseEvent):void
{
    if (e.type == MouseEvent.CLICK)
    {
        if (e.currentTarget.parent == soundButtons)
            changeSound(e.currentTarget as SimpleButton);
        else if (e.currentTarget.parent == controlButtons)
        {
            if (e.currentTarget == controlButtons.pauseButton)
                pauseSound();           
            else if (e.currentTarget == controlButtons.playButton)
                playSound(channelPosition);
            else if (e.currentTarget == controlButtons.stopButton)
                stopSound();
        }
       
        controlStates();
    }
}
function changeSound(button:SimpleButton):void
{
    currentSound = int(button.name.slice(5, button.name.length));
    channelPosition = 0;
   
    nowPlaying.text = "Current song = " + bgmList[currentSound].split("/").pop();
   
    if (playing)
    {
        sChannel.stop();
        playSound(channelPosition);       
    }           
}
function pauseSound():void
{
    if (playing)
    {
        channelPosition = sChannel.position;
        sChannel.stop();
        playing = false;
        paused = true;
    }   
}
function playSound(start:Number = 0, volume:Number = 1, loops:int = 0):void
{   
    if (currentSound == -1)
        return;
   
    if (sChannel)
        sChannel.stop();
   
    sound = new Sound();   
    sTransform = new SoundTransform();   
    sound.load(new URLRequest(bgmList[currentSound]));
    sChannel = sound.play(start, loops);   
    sTransform.volume = volume;
    sChannel.soundTransform = sTransform;
    playing = true;
    paused = false;
}
function stopSound():void
{
    if (sChannel)
    {
        sChannel.stop();
        channelPosition = 0;
        playing = false;
        paused = false;
    }
}
function controlStates():void
{
    if (playing)
    {
        progress.visible = true;
        bar.visible = true;
        controlButtons.pauseButton.alpha = 1;
        controlButtons.stopButton.alpha = 1;
    }
    else
    {
        controlButtons.pauseButton.alpha = 0.35;
       
        if (!paused)
        {
            progress.visible = false;
            bar.visible = false;
            controlButtons.stopButton.alpha = 0.35;
        }
    }
}
function enterFrameHandler(e:Event):void
{
    if (playing)
    {
        if (sound.length > 0)
            progress.scaleX = sChannel.position / sound.length;
    }       
}
function start():void
{
    stop();
   
    for (var i:int = 0, total:int = soundButtons.numChildren; i < total; i++)
        soundButtons.getChildAt(i).addEventListener(MouseEvent.CLICK, onMouse);
   
    for (i = 0, total = controlButtons.numChildren; i < total; i++)
        controlButtons.getChildAt(i).addEventListener(MouseEvent.CLICK, onMouse);
   
    stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
   
    nowPlaying.text = "Current song = none."
   
    controlStates();
}
start();
    oliversen
    oliversenAuthor
    Inspiring
    January 17, 2018

    This is just wonderful!

    Thank you so much!

    I have now two more questions. Iwould like sound to be played if I choose a Soundbutton, instead of choosing the channel and then pushing play. Would that be possible?

    Again, thank you so much!

      oliversen
      oliversenAuthor
      Inspiring
      April 29, 2018

      Hi again!

      Here is a very simple example for you to adapt to your app. Don't forget to change the songs names.

      AS3 code:

      import flash.events.Event;
      import flash.events.IOErrorEvent;
      import flash.net.URLLoader;
      import flash.net.URLRequest;
      import flash.text.TextFieldAutoSize;
      var jsonPath:String = "playlist.json";
      var json:Object;
      var bgmList:Vector.<String> = new Vector.<String>();
      function start():void
      {
          var loader:URLLoader = new URLLoader();
          var request:URLRequest = new URLRequest();
          request.url = jsonPath;
          loader.addEventListener(Event.COMPLETE, completeHandler);
          loader.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
          loader.load(request);
      }
      function completeHandler(e:Event):void
      {
          var loader:URLLoader = URLLoader(e.target);
          json = JSON.parse(loader.data);
         
          createButtons(json);
      }
      function errorHandler(e:Event):void
      {
          trace(e);
      }
      function createButtons(obj:Object):void
      {
          var button:SongButton;
         
          for (var i:int = 0, total:int = obj['songs'].length; i < total; i++)
          {
              bgmList = obj['songs'];
              button = new SongButton();
              button.x = stage.stageWidth * 0.5;
              button.y = button.height + (button.height + 10) * i;
              button.txt.autoSize = TextFieldAutoSize.LEFT;
              button.txt.text = bgmList.split(".")[0];       
              addChild(button);
          }   
      }
      start();

      JSON code:

      {
          "songs":
          [
              "Acoustic_Circles.mp3",
              "City_Plaza.mp3",
              "Entire.mp3"
          ]
      }

      FLA download:

      animate_cc_as3_playlist_from_json.zip - Google Drive

      I hope it helps.

      Regards,

      JC


      Thanks alot JoãoCésar!

      I have worked a little with your code. It seems like I get an error if I change the document type to Air for Android.

      Scene 1, Layer 'Layer_1', Frame 1, Line 41, Column 13 1046: Type was not found or was not a compile-time constant: SongButton.

      Scene 1, Layer 'Layer_1', Frame 1, Line 46, Column 16 1180: Call to a possibly undefined method SongButton.

      I guess It has something to do with SongButton not being part of the AIR. But I cannot find anything about it on the web.

      Thank you

      Robert Mc Dowell
      Robert Mc Dowell
      Legend
      January 16, 2018

      where do you declare var channel:SoundChannel = new SoundChannel(); ?

        oliversen
        oliversenAuthor
        Inspiring
        January 16, 2018

        Outside everything. It is the first line of code after import.

        JoãoCésar17023019
        Community Expert
        JoãoCésar17023019Community Expert
        Community Expert
        January 16, 2018

        The SoundChannel class doesn't have a start() function.

        SoundChannel - Adobe ActionScript® 3 (AS3 ) API Reference

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