The amount of sound the microphone is detecting. Values range from 0 (no sound is detected) to 100 (very loud sound is detected). The value of this property can help you determine a good value to pass to the Microphone.setSilenceLevel() method.

If the microphone is available but is not yet being used because Microphone.getMicrophone() has not been called, this property is set to -1.

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The codec to use for compessing audio. Available codecs are Nellymoser (the default) and Speex. The enumeration class SoundCodec contains the various values that are valid for the codec property.

If you use the Nellymoser codec, you can set the sample rate using Microphone.rate(). If you use the Speex codec, the sample rate is set to 16 kHz.

Speex includes voice activity detection (VAD) and automatically reduces bandwidth when no voice is detected. When using the Speex codec, Adobe recommends that you set the silence level to 0. To set the silence level, use the Microphone.setSilenceLevel() method.

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The encoded speech quality when using the Speex codec. Possible values are from 0 to 10. The default value is 6. Higher numbers represent higher quality but require more bandwidth, as shown in the following table. The bit rate values that are listed represent net bit rates and do not include packetization overhead.

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Number of Speex speech frames transmitted in a packet (message). Each frame is 20 ms long. The default value is two frames per packet.

The more Speex frames in a message, the lower the bandwidth required but the longer the delay in sending the message. Fewer Speex frames increases bandwidth required but reduces delay.

The amount by which the microphone boosts the signal. Valid values are 0 to 100. The default value is 50.

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The index of the microphone, as reflected in the array returned by Microphone.names.

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Specifies whether the user has denied access to the microphone (true) or allowed access (false). When this value changes, a status event is dispatched. For more information, see Microphone.getMicrophone().

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The name of the current sound capture device, as returned by the sound capture hardware.

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An array of strings containing the names of all available sound capture devices. The names are returned without having to display the Flash Player Privacy Settings panel to the user. This array provides the zero-based index of each sound capture device and the number of sound capture devices on the system, through the Microphone.names.length property. For more information, see the Array class entry.

Calling Microphone.names requires an extensive examination of the hardware, and it may take several seconds to build the array. In most cases, you can just use the default microphone.

Note: To determine the name of the current microphone, use the name property.

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The rate at which the microphone is capturing sound, in kHz. Acceptable values are 5, 8, 11, 22, and 44. The default value is 8 kHz if your sound capture device supports this value. Otherwise, the default value is the next available capture level above 8 kHz that your sound capture device supports, usually 11 kHz. Flash Player 10 and AIR 1.5 or later support a 16kHz rate value.

Note: If you are using the Speex codec (Microphone.codec = SoundCodec.SPEEX) for Flash Player 10 and AIR 1.5 or later, the default rate value is 16kHz. If you use the Speex codec and then change the codec value to Nellymoser (Microphone.codec = SoundCodec.NELLYMOSER), the rate continues to be set to 16kHz until you explicitly set the rate to a new value. To receive audio using Flash Player releases before Flash Player 10 and AIR releases before AIR 1.5, change both the codec and the rate values when you publish the audio.

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The amount of sound required to activate the microphone and dispatch the activity event. The default value is 10.

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The number of milliseconds between the time the microphone stops detecting sound and the time the activity event is dispatched. The default value is 2000 (2 seconds).

To set this value, use the Microphone.setSilenceLevel() method.

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Controls the sound of this microphone object when it is in loopback mode.

Set to true if echo suppression is enabled; false otherwise. The default value is false unless the user has selected Reduce Echo in the Flash Player Microphone Settings panel.

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Returns a reference to a Microphone object for capturing audio. To begin capturing the audio, you must attach the Microphone object to a NetStream object (see NetStream.attachAudio()).

Multiple calls to Microphone.get() reference the same microphone. Thus, if your code contains the lines mic1 = Microphone.get() and mic2 = Microphone.get(), both mic1 and mic2 reference the same (default) microphone.

If you want to get the default microphone, you need to call getMicrophone() with -1. If you call it without parameters, it will return the first microphone in the list.

Use the index property to get the index value of the current Microphone object. You can then pass this value to other methods of the Microphone class.

In general, you should not pass a value for index. Simply use the Microphone.getMicrophone() method to return a reference to the default microphone. By using the Microphone Settings panel, the user can specify the default microphone the application should use. If you pass a value for index, you might reference a microphone other than the one the user chooses. You can use index in rare cases—for example, if your application is capturing audio from two microphones at the same time.

When a SWF file tries to access the object returned by Microphone.getMicrophone() —for example, when you call NetStream.attachAudio()— Flash Player displays a Privacy dialog box that lets the user choose whether to allow or deny access to the microphone. (Make sure your Stage size is at least 215 x 138 pixels; this is the minimum size Flash Player requires to display the dialog box.)

When the user responds to this dialog box, a status event is dispatched that indicates the user's response. You can also check the Microphone.muted property to determine if the user has allowed or denied access to the microphone.

If Microphone.getMicrophone() returns null, either the microphone is in use by another application, or there are no microphones installed on the system. To determine whether any microphones are installed, use Microphones.names.length. To display the Flash Player Microphone Settings panel, which lets the user choose the microphone to be referenced by Microphone.getMicrophone, use Security.showSettings().

Parameters

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Routes audio captured by a microphone to the local speakers.

Parameters

Sets the minimum input level that should be considered sound and (optionally) the amount of silent time signifying that silence has actually begun.

• To prevent the microphone from detecting sound at all, pass a value of 100 for silenceLevel; the activity event is never dispatched.
• To determine the amount of sound the microphone is currently detecting, use Microphone.activityLevel.

Activity detection is the ability to detect when audio levels suggest that a person is talking. When someone is not talking, bandwidth can be saved because there is no need to send the associated audio stream. This information can also be used for visual feedback so that users know they (or others) are silent.

Silence values correspond directly to activity values. Complete silence is an activity value of 0. Constant loud noise (as loud as can be registered based on the current gain setting) is an activity value of 100. After gain is appropriately adjusted, your activity value is less than your silence value when you're not talking; when you are talking, the activity value exceeds your silence value.

This method is similar to Camera.setMotionLevel(); both methods are used to specify when the activity event is dispatched. However, these methods have a significantly different impact on publishing streams:

• Camera.setMotionLevel() is designed to detect motion and does not affect bandwidth usage. Even if a video stream does not detect motion, video is still sent.
• Microphone.setSilenceLevel() is designed to optimize bandwidth. When an audio stream is considered silent, no audio data is sent. Instead, a single message is sent, indicating that silence has started.

Parameters

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Specifies whether to use the echo suppression feature of the audio codec. The default value is false unless the user has selected Reduce Echo in the Flash Player Microphone Settings panel.

Echo suppression is an effort to reduce the effects of audio feedback, which is caused when sound going out the speaker is picked up by the microphone on the same computer. (This is different from echo cancellation, which completely removes the feedback.)

Generally, echo suppression is advisable when the sound being captured is played through speakers — instead of a headset — on the same computer. If your SWF file allows users to specify the sound output device, you may want to call Microphone.setUseEchoSuppression(true) if they indicate they are using speakers and will be using the microphone as well.

Users can also adjust these settings in the Flash Player Microphone Settings panel.

Parameters

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Dispatched when a microphone begins or ends a session.

To specify the amount of sound required to trigger this event with an activating property of true, or the amount of time that must elapse without sound to trigger this event with an activating property of false, use Microphone.setSilenceLevel().

This event has the following properties:

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Dispatched when a microphone reports its status. If the value of the code property is "Microphone.Muted", the user has refused to allow the SWF file access to the microphone. If the value of the code property is "Microphone.Unmuted", the user has allowed the SWF file access to the microphone.

This event has the following properties:

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Two listeners listen for activity and status events. The activity event is dispatched at the start and end (if any) of the session and is captured by the activityHandler() method, which traces information on the event. The status event is dispatched if the attached microphone object reports any status information; it is captured and traced using the statusHandler() method.

Note: A microphone must be attached to your computer for this example to work correctly.

package {
    import flash.display.Sprite;
    import flash.events.*;
    import flash.media.Microphone;
    import flash.system.Security;

    public class MicrophoneExample extends Sprite {
        public function MicrophoneExample() {
            var mic:Microphone = Microphone.getMicrophone();
            Security.showSettings("2");
            mic.setLoopBack(true);
                    
            if (mic != null) {
                mic.setUseEchoSuppression(true);
                mic.addEventListener(ActivityEvent.ACTIVITY, activityHandler);
                mic.addEventListener(StatusEvent.STATUS, statusHandler);
            }
        }

        private function activityHandler(event:ActivityEvent):void {
            trace("activityHandler: " + event);
        }

        private function statusHandler(event:StatusEvent):void {
            trace("statusHandler: " + event);
        }
    }
}