Android microphone audio sampling and usage

Android microphone audio sampling and usage

Some codes of Android phone microphone sampling are found online.

Sample results and functional code of your app:

1. In some apps, You need to obtain and use the audio input of the microphone, for example, a hot skirt;

2. Sampling thread:

Public class MicroLevelRunnable implements Runnable {
Private static final String tag = "MicroLevelThread ";
Private AudioRecord ar;
Private short bs;
// 11 025Hz, 8 bit sound is called telephone sound quality;
// 22 050Hz and 16 bit sound are called Broadcast sound quality;
// 44 100Hz and 16 bit have achieved CD sound quality [4].
Private final int sample_rate_in_hz= 22050;
Private boolean isRun = false;

Public static final int msg_v = 0;
Public static final int msg_vv = 1;
Public static final int msg_vf = 2;
Public static final int msg_vo = 3;

Public static final int page_need_water = 10;

Public static int bubble_speed = 2; // every N calls, a bubble is generated

Public MicroLevelRunnable (){
Super ();
}

Public void stop (){
IsRun = false;
Ar. stop ();
Ar. release ();
Ar = null;
}

Public void run (){
Bs = (short) AudioRecord. getMinBufferSize (SAMPLE_RATE_IN_HZ,
AudioFormat. CHANNEL_CONFIGURATION_MONO,
AudioFormat. ENCODING_PCM_16BIT );
Ar = new AudioRecord (MediaRecorder. AudioSource. MIC, SAMPLE_RATE_IN_HZ,
AudioFormat. CHANNEL_CONFIGURATION_MONO,
AudioFormat. ENCODING_PCM_16BIT, bs );
//
Ar. startRecording ();
Short [] buffer = new short [bs];
IsRun = true;
Int speed = 1;
While (true ){
If (! IsRun ){
Try {
Synchronized (this ){
Log. v (tag, "wait ..");
This. wait ();
}
} Catch (InterruptedException e ){
E. printStackTrace ();
}
}
Speed ++;
Int r = ar. read (buffer, 0, bs );
Int v = 0;
For (int I = 0; I <buffer. length; I ++ ){
V + = buffer [I] * buffer [I];
}
Int value = (int) (Math. abs (int) (v/(float) r)/10000)> 1 );

Double dB = 10 * Math. log10 (Math. abs (v)/(double) r );

Message msg = new Message ();
Msg. what = msg_v;
Msg. arg1 = value;
Msg. arg2 = (int) dB;
//-------------------------------------------
// Use the following method to identify whether it is blow. The disadvantage is that it can be simulated.
// If the DB white noise is less than 50, the noise is greater than 60.
// If the value is less than 38, it is silent. If the value is greater than 60, no error is returned.

If (speed> bubble_speed ){
BubbleMain. MainHandle. sendMessage (msg );
Speed = 1;
}
}
}

}

3. Start the sampling thread:

MRunnable = new MicroLevelRunnable ();
MThread = new Thread (mRunnable );
MThread. start ();

4. My android application [http://openbox.mobilem.360.cn/index/d/sid/341284 http://zhushou.360.cn/detail/index/soft_id/341284] blowing bubbles on the use of the above functional modules

This application is a typical application of web + android components. The presentation of blowing bubbles is a web program optimized and modified. Through the webview interface and the combination of microphone sampling threads, to achieve the effect of blowing bubbles on mobile phones: