audiocapture.java

JAVA-Applet的录音机程序,提供录制,播放,用户接口等功能.

package sunstudio.record.au.audio.capture;

import com.ms.dll.*;
import com.ms.win32.*;
import java.util.*;
import sunstudio.util.*;

public class AudioCapture{
	Vector listeners=new Vector();
	DllLib dlllib;
	int bufferlen=10;
	byte[][] data=new byte[bufferlen][1600];
	int dataPtr=0;
	WAVEINCAPS waveincaps;
	WAVEHDR[] wavehdr;
	int[] deviceid=new int[2];
	boolean useful=false;
	c wcb;
	boolean pause=true;//默认为暂停状态
	boolean isclose=false;
	boolean stop=false;
	String audioOutInfo="GSM.723(165b/0.1s)";
	private static final int WAVE_MAPPER=-1;
	private static final int MMSYSERR_NOERROR=0;
	private static final int CALLBACK_FUNCTION=0x00030000;
	private static final int MM_WIM_OPEN=0x3BE;
	private static final int MM_WIM_DATA=0x3C0;
	private static final int MM_WIM_CLOSE=0x3BF;
	WAVEFORMATEX waveformatex=null;
	int muteValue=2500;
				  
	public AudioCapture(){
        waveformatex=new WAVEFORMATEX();//音频采集格式
		waveformatex.wFormatTag=1;
		waveformatex.nChannels=1;
		waveformatex.wBitsPerSample=16;
		waveformatex.nSamplesPerSec=8000;
		waveformatex.nBlockAlign=(short)((waveformatex.nChannels*waveformatex.wBitsPerSample)/8);
		waveformatex.nAvgBytesPerSec=waveformatex.nSamplesPerSec*waveformatex.nBlockAlign;
		waveformatex.cbSize=0;
		dlllib=new DllLib();
		waveincaps=new WAVEINCAPS();
		wavehdr=new WAVEHDR[bufferlen];
	}
	public void addAudioDataListener(AudioDataListener lter){
		listeners.addElement(lter);
	}
	void applyBuffer(){
		for(int i=0;i<bufferlen;i++){
			wavehdr[i]=new WAVEHDR();
			int adr=dlllib.addrOfPinnedObject(dlllib.getPinnedHandle(data[i]));
			wavehdr[i].lpData=adr;
			wavehdr[i].dwBufferLength=1600;
			wavehdr[i].dwUser=i;
			wavehdr[i].dwFlags=0;
			wavehdr[i].dwLoops=0;
		}
	}
	int chkData(byte[] a){//将整型低16位高低位交叉并转为字节
		int max=0;
		for(int i=0;i<800;i++){
			short m=(short)(SystemTool.byteToShort(a[2*i],a[2*i+1]));
			a[2*i]=(byte)(m&0xff);
			a[2*i+1]=(byte)(m>>>8&0xff);
			if(Math.abs(m)>Math.abs(max))max=m;
		}
		return max;
	}
	public void close(){
		if(!useful)return;
		isclose=true;
		waveInStop(deviceid[0]);
		waveInReset(deviceid[0]);
		waveInClose(deviceid[0]);
	}
	public String getAudioOutInfo(){
		return audioOutInfo;
	}
	public boolean isUseful(){
		return useful;
	}
	synchronized void notifyListener(int minValue,byte[] audioData){
		AudioDataEvent evt=new AudioDataEvent(minValue,audioData);
		for(Enumeration enu=listeners.elements();enu.hasMoreElements();)
			((AudioDataListener)enu.nextElement()).onAudioDataArrived(evt);
	}
	public boolean open(){
		useful=openDevice();
		return useful;
	}
	boolean openDevice(){
		if(waveInGetNumDevs()<1)return false;
		if(waveInGetDevCaps(WAVE_MAPPER,waveincaps,dlllib.sizeOf(waveincaps))!=MMSYSERR_NOERROR)return false;
		wcb=new c(this);
		int hndpro=Root.alloc(wcb);
		int adrpro=dlllib.addrOf(hndpro);
		if(waveInOpen(deviceid,WAVE_MAPPER,waveformatex,adrpro,0,CALLBACK_FUNCTION)!=MMSYSERR_NOERROR)return false;
		applyBuffer();
		for(int i=0;i<bufferlen;i++)
			if(waveInPrepareHeader(deviceid[0],wavehdr[i],dlllib.sizeOf(wavehdr[i]))!=MMSYSERR_NOERROR)
				return false;
		if(waveInStart(deviceid[0])!=MMSYSERR_NOERROR)return false;
		return true;
	}
	void processData(int addrHdr){
		if(isclose&&stop)return;
		waveInAddBuffer(deviceid[0],wavehdr[dataPtr],dlllib.sizeOf(wavehdr[dataPtr]));
		dataPtr++;
		dataPtr%=bufferlen;
		try{
			WAVEHDR tmp=(WAVEHDR)dlllib.ptrToStruct(WAVEHDR.class,addrHdr);
			if(!pause){
				int max=chkData(data[tmp.dwUser]);
				if(Math.abs(max)<muteValue)notifyListener(0,null);
				else notifyListener(max,data[tmp.dwUser]);//Codec.encode(data[tmp.dwUser]));
			}
		}catch(Exception ee){}
	}
	/////////////////////////////////////////////////////
	public void suspend_record(){
		pause=true;
	}
	public void resume_record(){
		pause=false;
	}	
	public void start_record(){
		pause=false;
		stop=false;
		waveInAddBuffer(deviceid[0],wavehdr[dataPtr],dlllib.sizeOf(wavehdr[dataPtr]));
	}
	public void stop_record(){
		stop=true;
		pause=true;
	}
	/////////////////////////////////////////////////////
/*	public void setFilter(double volvalue){
		if(volvalue<0||volvalue>1)return;
		filter=(float)volvalue;
	}
*/
	public void setMuteValue(int muteValue){
		this.muteValue=muteValue;
	}
	/**@dll.import("WINMM",auto)*/
	private static native int waveInGetDevCaps(int uDeviceID,WAVEINCAPS pwic,int cbwic);
	/**@dll.import("WINMM",auto)*/
	private static native int waveInGetNumDevs();
	/**@dll.import("WINMM",auto)*/
	private static native int waveInOpen(int[] phwi,int uDeviceID,WAVEFORMATEX pwfx,int dwCallback,int dwInstance,int fdwOpen);
	/**@dll.import("WINMM",auto)*/
	private static native int waveInAddBuffer(int hwi,WAVEHDR pwh,int cbwh);
	/**@dll.import("WINMM",auto)*/
	private static native int waveInStart(int hwi);
	/**@dll.import("WINMM",auto)*/
	private static native int waveInPrepareHeader(int hwi,WAVEHDR pwh, int cbwh);
	/**@dll.import("WINMM",auto)*/
	private static native int waveInStop(int hwi);
	/**@dll.import("WINMM",auto)*/
	private static native int waveInClose(int hwi);
	/**@dll.import("WINMM",auto)*/
	public static native int waveInReset(int hwi);
	private class c extends Callback{
		AudioCapture record;
		c(AudioCapture tt){
			record=tt;
		}
	    private boolean callback(int hwi,int msg,int dwInstance,int dwParam1,int dwParam2){
			switch(msg){
			case AudioCapture.MM_WIM_DATA:
				record.processData(dwParam1);
				break;
			case AudioCapture.MM_WIM_OPEN:
				break;
			case AudioCapture.MM_WIM_CLOSE:
			}
			return true;
	    }
	}
}