ActionScript® 3.0 Reference for the Adobe® Flash® Platform
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flash.media 

SoundMixer  - AS3

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adobe.utils
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com.adobe.acm.solutions.authoring.domain.extensions
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com.adobe.consulting.pst.vo
com.adobe.dct.component
com.adobe.dct.component.datadictionary
com.adobe.dct.component.datadictionaryElement
com.adobe.dct.component.dataElementsPanel
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com.adobe.exm.expression
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com.adobe.exm.expression.impl
com.adobe.fiber.runtime.lib
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com.adobe.gravity.service.bundleloader
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com.adobe.icc.editors.events
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com.adobe.icomm.assetplacement.controller
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com.adobe.icomm.assetplacement.data
com.adobe.icomm.assetplacement.model
com.adobe.livecycle.assetmanager.client
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com.adobe.livecycle.assetmanager.client.handler
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com.adobe.livecycle.assetmanager.client.model
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com.adobe.livecycle.assetmanager.client.service
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com.adobe.livecycle.assetmanager.client.utils
com.adobe.livecycle.content
com.adobe.livecycle.rca.model
com.adobe.livecycle.rca.model.constant
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com.adobe.livecycle.rca.model.stage
com.adobe.livecycle.rca.service
com.adobe.livecycle.rca.service.core
com.adobe.livecycle.rca.service.core.delegate
com.adobe.livecycle.rca.service.process
com.adobe.livecycle.rca.service.process.delegate
com.adobe.livecycle.rca.token
com.adobe.livecycle.ria.security.api
com.adobe.livecycle.ria.security.service
com.adobe.mosaic.layouts
com.adobe.mosaic.layouts.dragAndDrop
com.adobe.mosaic.layouts.interfaces
com.adobe.mosaic.mxml
com.adobe.mosaic.om.constants
com.adobe.mosaic.om.events
com.adobe.mosaic.om.impl
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com.adobe.mosaic.skinning
com.adobe.mosaic.sparklib.editors
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com.adobe.mosaic.sparklib.tabLayout
com.adobe.mosaic.sparklib.tabLayout.events
com.adobe.mosaic.sparklib.tabLayout.layouts
com.adobe.mosaic.sparklib.tabLayout.skins
com.adobe.mosaic.sparklib.text
com.adobe.mosaic.sparklib.util
com.adobe.solutions.acm.authoring.presentation
com.adobe.solutions.acm.authoring.presentation.actionbar
com.adobe.solutions.acm.authoring.presentation.common
com.adobe.solutions.acm.authoring.presentation.events
com.adobe.solutions.acm.authoring.presentation.fragment
com.adobe.solutions.acm.authoring.presentation.letter
com.adobe.solutions.acm.authoring.presentation.letter.data
com.adobe.solutions.acm.authoring.presentation.preview
com.adobe.solutions.acm.authoring.presentation.rte
com.adobe.solutions.acm.ccr.presentation
com.adobe.solutions.acm.ccr.presentation.contentcapture
com.adobe.solutions.acm.ccr.presentation.contentcapture.events
com.adobe.solutions.acm.ccr.presentation.contentcapture.preview
com.adobe.solutions.acm.ccr.presentation.datacapture
com.adobe.solutions.acm.ccr.presentation.datacapture.renderers
com.adobe.solutions.acm.ccr.presentation.pdf
com.adobe.solutions.exm
com.adobe.solutions.exm.authoring
com.adobe.solutions.exm.authoring.components.controls
com.adobe.solutions.exm.authoring.components.toolbars
com.adobe.solutions.exm.authoring.domain
com.adobe.solutions.exm.authoring.domain.expression
com.adobe.solutions.exm.authoring.domain.impl
com.adobe.solutions.exm.authoring.domain.method
com.adobe.solutions.exm.authoring.domain.variable
com.adobe.solutions.exm.authoring.enum
com.adobe.solutions.exm.authoring.events
com.adobe.solutions.exm.authoring.model
com.adobe.solutions.exm.authoring.renderer
com.adobe.solutions.exm.authoring.view
com.adobe.solutions.exm.expression
com.adobe.solutions.exm.impl
com.adobe.solutions.exm.impl.method
com.adobe.solutions.exm.method
com.adobe.solutions.exm.mock
com.adobe.solutions.exm.mock.method
com.adobe.solutions.exm.runtime
com.adobe.solutions.exm.runtime.impl
com.adobe.solutions.exm.variable
com.adobe.solutions.prm.constant
com.adobe.solutions.prm.domain
com.adobe.solutions.prm.domain.factory
com.adobe.solutions.prm.domain.impl
com.adobe.solutions.prm.domain.manager
com.adobe.solutions.prm.presentation.asset
com.adobe.solutions.prm.presentation.constant
com.adobe.solutions.prm.presentation.document
com.adobe.solutions.prm.presentation.event
com.adobe.solutions.prm.presentation.file
com.adobe.solutions.prm.presentation.project
com.adobe.solutions.prm.presentation.team
com.adobe.solutions.prm.presentation.util
com.adobe.solutions.prm.service
com.adobe.solutions.prm.services.impl
com.adobe.solutions.prm.vo
com.adobe.solutions.rca.constant
com.adobe.solutions.rca.domain
com.adobe.solutions.rca.domain.common
com.adobe.solutions.rca.domain.factory
com.adobe.solutions.rca.domain.impl
com.adobe.solutions.rca.domain.impl.manager
com.adobe.solutions.rca.domain.manager
com.adobe.solutions.rca.presentation
com.adobe.solutions.rca.presentation.comment
com.adobe.solutions.rca.presentation.constant
com.adobe.solutions.rca.presentation.event
com.adobe.solutions.rca.presentation.gantt
com.adobe.solutions.rca.presentation.gantt.ruler
com.adobe.solutions.rca.presentation.template
com.adobe.solutions.rca.presentation.template.audit
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com.adobe.solutions.rca.presentation.template.documents
com.adobe.solutions.rca.presentation.template.stages
com.adobe.solutions.rca.presentation.util
com.adobe.solutions.rca.service
com.adobe.solutions.rca.services.impl
com.adobe.solutions.rca.vo
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com.adobe.viewsource
fl.accessibility
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fl.core
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fl.ik
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fl.transitions
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fl.video
flash.accessibility
flash.concurrent
flash.crypto
flash.data
flash.desktop
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flash.errors
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flash.external
flash.filesystem
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flash.globalization
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flash.net
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flash.notifications
flash.permissions
flash.printing
flash.profiler
flash.sampler
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flash.sensors
flash.system
flash.text
flash.text.engine
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flash.ui
flash.utils
flash.xml
flashx.textLayout
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flashx.textLayout.container
flashx.textLayout.conversion
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flashx.textLayout.elements
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lc.preloader
lc.procmgmt
lc.procmgmt.commands
lc.procmgmt.domain
lc.procmgmt.events
lc.procmgmt.formbridge
lc.procmgmt.impl
lc.procmgmt.ui.attachments
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lc.procmgmt.ui.controls.card
lc.procmgmt.ui.controls.renderer
lc.procmgmt.ui.help
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mx.controls
mx.controls.advancedDataGridClasses
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mx.controls.videoClasses
mx.core
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mx.data
mx.data.crypto
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mx.graphics.codec
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mx.logging
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mx.managers
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spark.transitions
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xd.core.axm.enterprise.view.components
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Language Elements

Global Constants
Global Functions
Operators
Statements, Keywords & Directives
Special Types

Appendixes

What's New
Compiler Errors
Compiler Warnings
Run-Time Errors
Migrating to ActionScript 3
Supported Character Sets
MXML Only Tags
Motion XML Elements
Timed Text Tags
List of deprecated elements
Accessibility Implementation Constants
How to Use ActionScript Examples
Legal notices
Packageflash.media
Classpublic final class SoundMixer
InheritanceSoundMixer Inheritance Object

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0, Flash Player 9, Flash Lite 4

The SoundMixer class contains static properties and methods for global sound control in the application. The SoundMixer class controls embedded and streaming sounds in the application, as well as dynamically created sounds (that is, sounds generated in response to a Sound object dispatching a sampleData event).



Public Properties
 PropertyDefined By
      audioPlaybackMode : String
[static] Specifies the audio playback mode of all Sound objects.
SoundMixer
  bufferTime : int
[static] The number of seconds to preload an embedded streaming sound into a buffer before it starts to stream.
SoundMixer
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  soundTransform : flash.media:SoundTransform
[static] The SoundTransform object that controls global sound properties.
SoundMixer
      useSpeakerphoneForVoice : Boolean
[static] Toggles the speakerphone when the device is in voice mode.
SoundMixer
Public Methods
 MethodDefined By
  
[static] Determines whether any sounds are not accessible due to security restrictions.
SoundMixer
  
computeSpectrum(outputArray:ByteArray, FFTMode:Boolean = false, stretchFactor:int = 0):void
[static] Takes a snapshot of the current sound wave and places it into the specified ByteArray object.
SoundMixer
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
  
[static] Stops all sounds currently playing.
SoundMixer
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Property Detail
    

audioPlaybackMode

property
audioPlaybackMode:String

Language Version: ActionScript 3.0
Runtime Versions: AIR 3

Specifies the audio playback mode of all Sound objects. On mobile devices, this property sets sound priorities and defaults according to platform idioms. In desktop and TV environments, no functional difference exists between audio playback modes.

Valid values for this property are defined in the AudioPlaybackMode class.

Note On iOS, if one application sets audioPlaybackMode=AudioPlaybackMode.VOICE, other applications cannot change it to AudioPlaybackMode.MEDIA.

Make the minimum usage of AudioPlaybackMode.VOICE mode, and try to switch to AudioPlaybackMode.MEDIA mode as soon as you can after the voice call ends to allow other applications to play in media mode.

When you change audio play mode on iOS, mative apps playing music pause briefly.

The default value is AudioPlaybackMode.MEDIA.



Implementation
    public static function get audioPlaybackMode():String
    public static function set audioPlaybackMode(value:String):void

Throws
ArgumentError — kInvalidParameterError

Related API Elements

bufferTime

property 
bufferTime:int

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0, Flash Player 9, Flash Lite 4

The number of seconds to preload an embedded streaming sound into a buffer before it starts to stream. The data in a loaded sound, including its buffer time, cannot be accessed by a SWF file that is in a different domain unless you implement a cross-domain policy file. For more information about security and sound, see the Sound class description. The data in a loaded sound, including its buffer time, cannot be accessed by code in a file that is in a different domain unless you implement a cross-domain policy file. However, in the application sandbox in an AIR application, code can access data in sound files from any source. For more information about security and sound, see the Sound class description.

The SoundMixer.bufferTime property only affects the buffer time for embedded streaming sounds in a SWF and is independent of dynamically created Sound objects (that is, Sound objects created in ActionScript). The value of SoundMixer.bufferTime cannot override or set the default of the buffer time specified in the SoundLoaderContext object that is passed to the Sound.load() method.



Implementation
    public static function get bufferTime():int
    public static function set bufferTime(value:int):void

Related API Elements

soundTransform

property 
soundTransform:flash.media:SoundTransform

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0, Flash Player 9, Flash Lite 4

The SoundTransform object that controls global sound properties. A SoundTransform object includes properties for setting volume, panning, left speaker assignment, and right speaker assignment. The SoundTransform object used in this property provides final sound settings that are applied to all sounds after any individual sound settings are applied.



Implementation
    public static function get soundTransform():flash.media:SoundTransform
    public static function set soundTransform(value:flash.media:SoundTransform):void

Related API Elements

    

useSpeakerphoneForVoice

property 
useSpeakerphoneForVoice:Boolean

Language Version: ActionScript 3.0
Runtime Versions: AIR 3

Toggles the speakerphone when the device is in voice mode. By default, smartphones use the phone earpiece for audio output when SoundMixer.audioPlaybackMode is set to AudioPlaybackMode.VOICE. The useSpeakerphoneForVoice property lets you override the default output so that you can implement a speakerphone button in a phone application. This property has no effect in modes other than AudioPlaybackMode.VOICE. In desktop and TV environments, this property has no effect.

Note On iOS, if your application has set audioPlaybackMode=VOICE and another application is also playing in voice mode, you cannot set useSpeakerphoneForVoice=true.

Note On Android, you must set the android.permission.MODIFY_AUDIO_SETTINGS in the AIR application descriptor or changing this value has no effect. In addition, the setting is global device setting. Other applications running on the device can change the underlying device setting at any time.

The default value is false.



Implementation
    public static function get useSpeakerphoneForVoice():Boolean
    public static function set useSpeakerphoneForVoice(value:Boolean):void

Related API Elements

Method Detail

areSoundsInaccessible

()method
public static function areSoundsInaccessible():Boolean

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0, Flash Player 9

Determines whether any sounds are not accessible due to security restrictions. For example, a sound loaded from a domain other than that of the content calling this method is not accessible if the server for the sound has no URL policy file that grants access to the domain of that domain. The sound can still be loaded and played, but low-level operations, such as getting ID3 metadata for the sound, cannot be performed on inaccessible sounds.

For AIR application content in the application security sandbox, calling this method always returns false. All sounds, including those loaded from other domains, are accessible to content in the application security sandbox.

Returns
Boolean — The string representation of the boolean.

Related API Elements

computeSpectrum

()method 
public static function computeSpectrum(outputArray:ByteArray, FFTMode:Boolean = false, stretchFactor:int = 0):void

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0, Flash Player 9

Takes a snapshot of the current sound wave and places it into the specified ByteArray object. The values are formatted as normalized floating-point values, in the range -1.0 to 1.0. The ByteArray object passed to the outputArray parameter is overwritten with the new values. The size of the ByteArray object created is fixed to 512 floating-point values, where the first 256 values represent the left channel, and the second 256 values represent the right channel.

Note: This method is subject to local file security restrictions and restrictions on cross-domain loading. If you are working with local files or sounds loaded from a server in a different domain than the calling content, you might need to address sandbox restrictions through a cross-domain policy file. For more information, see the Sound class description. In addition, this method cannot be used to extract data from RTMP streams, even when it is called by content that reside in the same domain as the RTMP server.

This method is supported over RTMP in Flash Player 9.0.115.0 and later and in Adobe AIR. You can control access to streams on Flash Media Server in a server-side script. For more information, see the Client.audioSampleAccess and Client.videoSampleAccess properties in Server-Side ActionScript Language Reference for Adobe Flash Media Server.

Parameters

outputArray:ByteArray — A ByteArray object that holds the values associated with the sound. If any sounds are not available due to security restrictions (areSoundsInaccessible == true), the outputArray object is left unchanged. If all sounds are stopped, the outputArray object is filled with zeros.
 
FFTMode:Boolean (default = false) — A Boolean value indicating whether a Fourier transformation is performed on the sound data first. Setting this parameter to true causes the method to return a frequency spectrum instead of the raw sound wave. In the frequency spectrum, low frequencies are represented on the left and high frequencies are on the right.
 
stretchFactor:int (default = 0) — The resolution of the sound samples. If you set the stretchFactor value to 0, data is sampled at 44.1 KHz; with a value of 1, data is sampled at 22.05 KHz; with a value of 2, data is sampled 11.025 KHz; and so on.

Related API Elements


Example  ( How to use this example )

In the following example, the computeSpectrum() method is used to produce a graphic representation of the sound wave data.

In the constructor, a sound file is loaded and set to play. (There is no error handling in this example and it is assumed that the sound file is in the same directory as the SWF file.) The example listens for the Event.ENTER_FRAME event while the sound plays, repeatedly triggering the onEnterFrame() method to draw a graph of the sound data values. When the sound finishes playing the onPlaybackComplete() method stops the drawing process by removing the listener for the Event.ENTER_FRAME event.

In the onEnterFrame() method, the computeSpectrum() method stores the raw sound in the bytes byte array object. The data is sampled at 44.1 KHz. The byte array containing 512 bytes of data, each of which contains a floating-point value between -1 and 1. The first 256 values represent the left channel, and the second 256 values represent the right channel. The first for loop, reads the first 256 data values (the left stereo channel) and draws a line from each point to the next using the Graphics.lineTo() method. (The vector graphic display of the sound wave is written directly on to the class's sprite object.) The sound bytes are read as 32-bit floating-point number from the byte stream and multiplied by the plot height to allow for the vertical range of the graph. The width is set to twice the width of the channel length. The second for loop reads the next set of 256 values (the right stereo channel), and plots the lines in reverse order. The g.lineTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT); and g.lineTo(0, PLOT_HEIGHT); methods draw the baseline for the waves. The resulting waveform plot produces a mirror-image effect.

package {
    import flash.display.Sprite;
    import flash.display.Graphics;
    import flash.events.Event;
    import flash.media.Sound;
    import flash.media.SoundChannel;
    import flash.media.SoundMixer;
    import flash.net.URLRequest;
    import flash.utils.ByteArray;
    import flash.text.TextField;

    public class SoundMixer_computeSpectrumExample extends Sprite {

        public function SoundMixer_computeSpectrumExample() {
            var snd:Sound = new Sound();
            var req:URLRequest = new URLRequest("Song1.mp3");
            snd.load(req);
            
            var channel:SoundChannel;
            channel = snd.play();
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
            channel.addEventListener(Event.SOUND_COMPLETE, onPlaybackComplete);
        }

        private function onEnterFrame(event:Event):void {
            var bytes:ByteArray = new ByteArray();
            const PLOT_HEIGHT:int = 200;
            const CHANNEL_LENGTH:int = 256;

            SoundMixer.computeSpectrum(bytes, false, 0);
            
            var g:Graphics = this.graphics;
            
            g.clear();
       
            g.lineStyle(0, 0x6600CC);
            g.beginFill(0x6600CC);
            g.moveTo(0, PLOT_HEIGHT);
            
            var n:Number = 0;
            
            for (var i:int = 0; i < CHANNEL_LENGTH; i++) {
                n = (bytes.readFloat() * PLOT_HEIGHT);
                g.lineTo(i * 2, PLOT_HEIGHT - n);
            }

            g.lineTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT);
            g.endFill();
 
            g.lineStyle(0, 0xCC0066);
            g.beginFill(0xCC0066, 0.5);
            g.moveTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT);
            
            for (i = CHANNEL_LENGTH; i > 0; i--) {
                n = (bytes.readFloat() * PLOT_HEIGHT);
                g.lineTo(i * 2, PLOT_HEIGHT - n);
            }
  
            g.lineTo(0, PLOT_HEIGHT);
            g.endFill();
        }
        
        private function onPlaybackComplete(event:Event):void {
            removeEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
    }
}

stopAll

()method 
public static function stopAll():void

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0, Flash Player 9, Flash Lite 4

Stops all sounds currently playing.

>In Flash Professional, this method does not stop the playhead. Sounds set to stream will resume playing as the playhead moves over the frames in which they are located.

When using this property, consider the following security model:

  • By default, calling the SoundMixer.stopAll() method stops only sounds in the same security sandbox as the object that is calling the method. Any sounds whose playback was not started from the same sandbox as the calling object are not stopped.
  • When you load the sound, using the load() method of the Sound class, you can specify a context parameter, which is a SoundLoaderContext object. If you set the checkPolicyFile property of the SoundLoaderContext object to true, Flash Player or Adobe AIR checks for a cross-domain policy file on the server from which the sound is loaded. If the server has a cross-domain policy file, and the file permits the domain of the calling content, then the file can stop the loaded sound by using the SoundMixer.stopAll() method; otherwise it cannot.

However, in Adobe AIR, content in the application security sandbox (content installed with the AIR application) are not restricted by these security limitations.

For more information related to security, see the Flash Player Developer Center Topic: Security.


Example  ( How to use this example )

In the following example, the stopAll() method is used to mute two sounds that are playing at the same time.

In the constructor, two different sound files are loaded and set to play. The first sound is loaded locally and is assigned to a sound channel. (It is assumed that the file is in the same directory as the SWF file.) The second file is loaded and streamed from the Adobe site. In order to use the SoundMixer.stopAll() method, all sound must be accessible. (A SoundLoaderContext object can be used to check for the cross-domain policy file.) Each sound also has an event listener that is invoked if an IO error occurred while loading the sound file. A muteButton text field is also created. It listens for a click event, which will invoke the muteButtonClickHandler() method.

In the muteButtonClickHandler() method, if the text field content is "MUTE," the areSoundsInaccessible() method checks if the sound mixer has access to the files. If the files are accessible, the stopAll() method stops the sounds. By selecting the text field again, the first sound begins playing and the text field's content changes to "MUTE" again. This time, the stopAll() method mutes the one sound that is running. Note that sound channel stop() method can also be used to stop a specific sound assigned to the channel. (To use the channel functionally, the sound needs to be reassigned to the channel each time the play() method is invoked.)

package {
    import flash.display.Sprite;
    import flash.net.URLRequest;
    import flash.media.Sound;
    import flash.media.SoundLoaderContext;
    import flash.media.SoundChannel;
    import flash.media.SoundMixer;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.events.MouseEvent;
    import flash.events.IOErrorEvent;

    public class SoundMixer_stopAllExample extends Sprite  {
        private var firstSound:Sound = new Sound();
        private var secondSound:Sound = new Sound();
        private var muteButton:TextField = new TextField();
        private var channel1:SoundChannel = new SoundChannel();
        
        public function SoundMixer_stopAllExample() {
            firstSound.load(new URLRequest("mySound.mp3"));
            secondSound.load(new URLRequest("http://av.adobe.com/podcast/csbu_dev_podcast_epi_2.mp3"));

            firstSound.addEventListener(IOErrorEvent.IO_ERROR, firstSoundErrorHandler);
            secondSound.addEventListener(IOErrorEvent.IO_ERROR, secondSoundErrorHandler);
            
            channel1 = firstSound.play();
            secondSound.play();
            
            muteButton.autoSize = TextFieldAutoSize.LEFT;
            muteButton.border = true;
            muteButton.background = true;
            muteButton.text = "MUTE";
        
            muteButton.addEventListener(MouseEvent.CLICK, muteButtonClickHandler);         
        
            this.addChild(muteButton);
        }

        private function muteButtonClickHandler(event:MouseEvent):void {

            if(muteButton.text == "MUTE") {        
  
                if(SoundMixer.areSoundsInaccessible() == false) {
                    SoundMixer.stopAll();
                    muteButton.text = "click to play only one of sound.";
                }
                else {
                    muteButton.text = "The sounds are not accessible.";
                }
            }
           else {
                firstSound.play();        
                muteButton.text = "MUTE";
           }
        } 

        private function firstSoundErrorHandler(errorEvent:IOErrorEvent):void {
            trace(errorEvent.text);
        }

        private function secondSoundErrorHandler(errorEvent:IOErrorEvent):void {
            trace(errorEvent.text);
        }
    }
}