Real-time playback of Android Audiotrack

Objective:

In fact, recording in Android can be recorded with Mediarecord, the operation is relatively simple. However, the audio cannot be processed. Consider that the project is done in real-time voice can only select Audiorecord for recording. Then live playback can only be played with Audiotrack.

The following are specific implementations:

 Public classAudiotrackmanager { Public Static FinalString TAG = "Audiotrackmanager"; PrivateAudiotrack Audiotrack; PrivateDataInputStream Dis; PrivateThread Recordthread; Private BooleanIsstart =false; Private StaticAudiotrackmanager minstance; Private intbuffersize;  PublicAudiotrackmanager () {buffersize= Audiotrack.getminbuffersize (8000, Audioformat.channel_out_mono, audioformat.encoding_pcm_16bit); Audiotrack=NewAudiotrack (Audiomanager.stream_music, 8000, Audioformat.channel_out_mono, Audioformat.encoding_pcm_16bit, BufferSize * 2, Audiotrack.mode_stream); }    /*** Get a singleton reference * *@return     */     Public StaticAudiotrackmanager getinstance () {if(Minstance = =NULL) {            synchronized(Audiotrackmanager.class) {                if(Minstance = =NULL) {minstance=NewAudiotrackmanager (); }            }        }        returnminstance; }    /*** Destroying threading methods*/    Private voidDestroythread () {Try{Isstart=false; if(NULL! = Recordthread && Thread.State.RUNNABLE = =recordthread.getstate ()) {                Try{Thread.Sleep (500);                Recordthread.interrupt (); } Catch(Exception e) {recordthread=NULL; }} recordthread=NULL; } Catch(Exception e) {e.printstacktrace (); } finally{Recordthread=NULL; }    }    /*** Start the playback thread*/    Private voidStartthread () {destroythread (); Isstart=true; if(Recordthread = =NULL) {Recordthread=NewThread (recordrunnable);        Recordthread.start (); }    }    /*** Play Thread*/Runnable recordrunnable=NewRunnable () {@Override Public voidrun () {Try{android.os.Process.setThreadPriority (Android.os.Process.THREAD_PRIORITY_URGENT_AUDIO); byte[] Tempbuffer =New byte[buffersize]; intReadcount = 0;  while(dis.available () > 0) {Readcount=Dis.read (Tempbuffer); if(Readcount = = Audiotrack.error_invalid_operation | | readcount = =audiotrack.error_bad_value) {                        Continue; }                    if(Readcount! = 0 && Readcount! =-1) {audiotrack.play (); Audiotrack.write (Tempbuffer,0, Readcount);            }} stopplay (); } Catch(Exception e) {e.printstacktrace ();    }        }    }; /*** Play File * *@paramPath *@throwsException*/    Private voidSetPath (String Path)throwsException {File file=NewFile (path); Dis=NewDataInputStream (Newfileinputstream (file)); }    /*** Start Play * *@paramPath*/     Public voidstartplay (String path) {Try{setpath (path);        Startthread (); } Catch(Exception e) {e.printstacktrace (); }    }    /*** Stop playing*/     Public voidStopplay () {Try{destroythread (); if(Audiotrack! =NULL) {                if(audiotrack.getstate () = =audiorecord.state_initialized)                {audiotrack.stop (); }                if(Audiotrack! =NULL) {audiotrack.release (); }            }            if(Dis! =NULL) {dis.close (); }        } Catch(Exception e) {e.printstacktrace (); }    }}

Real-time playback of Android Audiotrack