net.sf.fmj.media.protocol.javasound
Class SimpleAudioRecorder

java.lang.Object
  java.lang.Thread
      net.sf.fmj.media.protocol.javasound.SimpleAudioRecorder

All Implemented Interfaces:

java.lang.Runnable

public class SimpleAudioRecorder
extends java.lang.Thread

SimpleAudioRecorder Records audio data and stores it in a file. The data is recorded in CD quality (44.1 kHz, 16 bit linear, stereo) and stored in a .wav file. java SimpleAudioRecorder -h java SimpleAudioRecorder audiofile -h print usage information, then exit audiofile the file name of the audio file that should be produced from the recorded data You cannot select audio formats and the audio file type on the command line. See AudioRecorder for a version that has more advanced options. Due to a bug in the Sun jdk1.3/1.4, this program does not work with it. SimpleAudioRecorder.java

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

SimpleAudioRecorder(javax.sound.sampled.TargetDataLine line, javax.sound.sampled.AudioFileFormat.Type targetType, java.io.File file)

Method Summary

static void	main(java.lang.String[] args)
void	run() Main working method.
void	start() Starts the recording.
void	stopRecording() Stops the recording.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SimpleAudioRecorder

public SimpleAudioRecorder(javax.sound.sampled.TargetDataLine line,
                           javax.sound.sampled.AudioFileFormat.Type targetType,
                           java.io.File file)

Method Detail

start

public void start()

Starts the recording. To accomplish this, (i) the line is started and (ii) the thread is started.

Overrides:

start in class java.lang.Thread

stopRecording

public void stopRecording()

Stops the recording. Note that stopping the thread explicitely is not necessary. Once no more data can be read from the TargetDataLine, no more data be read from our AudioInputStream. And if there is no more data from the AudioInputStream, the method 'AudioSystem.write()' (called in 'run()' returns. Returning from 'AudioSystem.write()' is followed by returning from 'run()', and thus, the thread is terminated automatically. It's not a good idea to call this method just 'stop()' because stop() is a (deprecated) method of the class 'Thread'. And we don't want to override this method.

run

public void run()

Main working method. You may be surprised that here, just 'AudioSystem.write()' is called. But internally, it works like this: AudioSystem.write() contains a loop that is trying to read from the passed AudioInputStream. Since we have a special AudioInputStream that gets its data from a TargetDataLine, reading from the AudioInputStream leads to reading from the TargetDataLine. The data read this way is then written to the passed File. Before writing of audio data starts, a header is written according to the desired audio file type. Reading continues untill no more data can be read from the AudioInputStream. In our case, this happens if no more data can be read from the TargetDataLine. This, in turn, happens if the TargetDataLine is stopped or closed (which implies stopping). (Also see the comment above.) Then, the file is closed and 'AudioSystem.write()' returns.

Specified by:

run in interface java.lang.Runnable

Overrides:

run in class java.lang.Thread

main

public static void main(java.lang.String[] args)