casinilogic

The Microphone class lets your application connect to a microphone or other sound input device on the user’s system and broadcast the input audio to that system’s speakers or send the audio data to a remote server, such as Flash Media Server. You can access the raw audio data from the microphone and record or process it; you can also send the audio directly to the system’s speakers or send compressed audio data to a remote server.

You can use either Speex or Nellymoser codec for data sent to a remote server. (The Speex codec is supported starting with Flash Player 10 and Adobe AIR 1.5.). Audio input from a microphone can be routed to the local system speakers by calling the Microphone.setLoopback() method with a parameter value of true.

When sound from a local microphone is routed to local speakers, there is a risk of creating an audio feedback loop, which can cause loud squealing sounds and can potentially damage sound hardware. Calling the Microphone.setUseEchoSuppression() method with a parameter value of true reduces, but does not completely eliminate, the risk that audio feedback will occur. Adobe recommends you always call Microphone.setUseEchoSuppression(true) before calling Microphone.setLoopback(true), unless you are certain that the user is playing back the sound using headphones or something other than speakers.

The following code shows how to route the audio from a local microphone to the local system speakers: var mic:Microphone = Microphone.getMicrophone(); mic.setUseEchoSuppression(true); mic.setLoopBack(true). Your application can alter the audio data that comes from a microphone in two ways.

First, it can change the gain of the input sound, which effectively multiplies the input values by a specified amount to create a louder or quieter sound. The Microphone.gain property accepts numeric values between 0 and 100 inclusive. A value of 50 acts like a multiplier of one and specifies normal volume. A value of zero acts like a multiplier of zero and effectively silences the input audio. Values above 50 specify higher than normal volume. Your application can also change the sample rate of the input audio.

Higher sample rates increase sound quality, but they also create denser data streams that use more resources for transmission and storage. The Microphone.rate property represents the audio sample rate measured in kilohertz (kHz). The default sample rate is 8 kHz. You can set the Microphone.rate property to a value higher than 8 kHz if your microphone supports the higher rate.

For example, setting the Microphone.rate property to a value of 11 sets the sample rate to 11 kHz; setting it to 22 sets the sample rate to 22 kHz, and so on. C Program For Binary Tree Traversal. The sample rates available depend on the selected codec. When you use the Nellymoser codec, you can specify 5, 8, 11, 16, 22 and 44 kHz as the sample rate. When you use Speex codec (available starting in Flash Player 10 and Adobe AIR 1.5), you can only use 16 kHz.

2152 related questions.

To conserve bandwidth and processing resources, Flash Player tries to detect when no sound is being transmitted by a microphone. When the microphone’s activity level stays below the silence level threshold for a period of time, Flash Player stops transmitting the audio input and dispatches a simple ActivityEvent instead. If you use the Speex codec (available in Flash Player 10 or later and Adobe AIR 1.5 or later), set the silence level to 0, to ensure that the application continuously transmits audio data. Speex voice activity detection automatically reduces bandwidth.

Additional audio capabilities are available when using ActionScript with a streaming media server such as Flash Media Server. In particular, your application can attach a Microphone object to a NetStream object and transmit data directly from the user’s microphone to the server. Audio data can also be streamed from the server to an application and played back as part of a MovieClip or by using a Video object.

The Speex codec is available starting with Flash Player 10 and Adobe AIR 1.5. To set the codec used for compressed audio sent to the media server, set the codec property of the Microphone object. This property can have two values, which are enumerated in the SoundCodec class. Setting the codec property to SoundCodec.SPEEX selects the Speex codec for compressing audio. Setting the property to SoundCodec.NELLYMOSER (the default) selects the Nellymoser codec for compressing audio. For more information, see the Flash Media Server documentation online. In Flash Player 10.1 and AIR 2, or later, you can capture data from a microphone data as a byte array of floating point values.