org.monte.screenrecorder

Class ScreenRecorder

java.lang.Object

org.monte.media.beans.AbstractStateModel

org.monte.screenrecorder.ScreenRecorder

public class ScreenRecorder
extends AbstractStateModel

A screen recorder written in pure Java.

Captures the screen, the mouse cursor and audio.

This class records mouse clicks occurring on other Java Windows running in the same JVM. Mouse clicks occurring in other JVM's and other processes are not recorded. This ability is useful for performing in-JVM recordings of an application that is being tested.

This recorder uses four threads. Three capture threads for screen, mouse cursor and audio, and one output thread for the movie writer.

FIXME - This class is a horrible mess.

Version:

$Id: ScreenRecorder.java 303 2013-01-03 07:43:37Z werner $

Author:

Werner Randelshofer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	ScreenRecorder.MouseGrabber
static class	ScreenRecorder.State

Field Summary

Fields

Modifier and Type	Field and Description
protected int	audioTrack Id of the audio track.
static String	ENCODING_BLACK_CURSOR "Encoding" for black mouse cursor.
static String	ENCODING_WHITE_CURSOR "Encoding" for white mouse cursor.
static String	ENCODING_YELLOW_CURSOR "Encoding" for yellow mouse cursor.
protected ScheduledThreadPoolExecutor	mouseCaptureTimer Timer for mouse captures.
protected Format	mouseFormat The input video format for cursor capture.
protected ScheduledFuture	mouseFuture
protected ScreenRecorder.MouseGrabber	mouseGrabber
protected File	movieFolder Where to store the movie.
protected long	recordingStartTime The start time of the recording.
protected long	recordingStopTime The stop time of the recording.
protected int	videoTrack Id of the video track.

Fields inherited from class org.monte.media.beans.AbstractStateModel

changeEvent, listenerList

Constructor Summary

Constructors

Constructor and Description
ScreenRecorder(GraphicsConfiguration cfg) Creates a screen recorder.
ScreenRecorder(GraphicsConfiguration cfg, Format fileFormat, Format screenFormat, Format mouseFormat, Format audioFormat) Creates a screen recorder.
ScreenRecorder(GraphicsConfiguration cfg, Rectangle captureArea, Format fileFormat, Format screenFormat, Format mouseFormat, Format audioFormat) Creates a screen recorder.
ScreenRecorder(GraphicsConfiguration cfg, Rectangle captureArea, Format fileFormat, Format screenFormat, Format mouseFormat, Format audioFormat, File movieFolder) Creates a screen recorder.

Method Summary

Methods

Modifier and Type	Method and Description
protected File	createMovieFile(Format fileFormat) Creates a file for recording the movie.
protected MovieWriter	createMovieWriter()
float	getAudioLevelLeft() Returns the audio level of the left channel or of the mono channel.
float	getAudioLevelRight() Returns the audio level of the right channel.
Mixer	getAudioMixer() Gets the audio mixer used for sound input.
List<File>	getCreatedMovieFiles() Returns a list of all files that the screen recorder created.
long	getMaxFileSize() Maximal file size.
long	getMaxRecordingTime() Maximal recording time in milliseconds.
long	getStartTime()
ScreenRecorder.State	getState() Returns the state of the recorder.
String	getStateMessage() Returns the state of the recorder.
void	setAudioMixer(Mixer mixer) Sets the audio mixer for sound input.
void	setMaxFileSize(long maxFileSize)
void	setMaxRecordingTime(long maxRecordingTime) Maximal recording time in milliseconds.
void	start() Starts the screen recorder.
protected void	startMouseCapture() Starts mouse capture.
void	stop() Stops the screen recorder.
protected void	stopMouseCapture() Stops mouse capturing.
protected void	waitUntilMouseCaptureStopped() Waits until mouse capturing stopped.
protected void	write(Buffer buf) Writes a buffer into the movie.

Methods inherited from class org.monte.media.beans.AbstractStateModel

addChangeListener, fireStateChanged, removeChangeListener

Methods inherited from class java.lang.Object

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

Field Detail

ENCODING_BLACK_CURSOR

public static final String ENCODING_BLACK_CURSOR

"Encoding" for black mouse cursor.

See Also:

Constant Field Values

ENCODING_WHITE_CURSOR

public static final String ENCODING_WHITE_CURSOR

"Encoding" for white mouse cursor.

See Also:

Constant Field Values

ENCODING_YELLOW_CURSOR

public static final String ENCODING_YELLOW_CURSOR

"Encoding" for yellow mouse cursor.

See Also:

Constant Field Values

mouseFormat

protected Format mouseFormat

The input video format for cursor capture. "black" or "white".

recordingStartTime

protected long recordingStartTime

The start time of the recording.

recordingStopTime

protected volatile long recordingStopTime

The stop time of the recording.

mouseCaptureTimer

protected ScheduledThreadPoolExecutor mouseCaptureTimer

Timer for mouse captures.

videoTrack

protected int videoTrack

Id of the video track.

audioTrack

protected int audioTrack

Id of the audio track.

mouseGrabber

protected ScreenRecorder.MouseGrabber mouseGrabber

mouseFuture

protected ScheduledFuture mouseFuture

movieFolder

protected File movieFolder

Where to store the movie.

Constructor Detail

ScreenRecorder

public ScreenRecorder(GraphicsConfiguration cfg)
               throws IOException,
                      AWTException

Creates a screen recorder.

Parameters:

cfg - Graphics configuration of the capture screen.

Throws:

IOException

AWTException

ScreenRecorder

public ScreenRecorder(GraphicsConfiguration cfg,
              Format fileFormat,
              Format screenFormat,
              Format mouseFormat,
              Format audioFormat)
               throws IOException,
                      AWTException

Creates a screen recorder.

Parameters:

cfg - Graphics configuration of the capture screen.

fileFormat - The file format "AVI" or "QuickTime".

screenFormat - The video format for screen capture.

mouseFormat - The video format for mouse capture. The EncodingKey must be ENCODING_BLACK_CURSOR or ENCODING_WHITE_CURSOR. The SampleRateKey can be independent from the screenFormat. Specify null if you don't want to capture the mouse cursor.

audioFormat - The audio format for audio capture. Specify null if you don't want audio capture.

Throws:

IOException

AWTException

ScreenRecorder

public ScreenRecorder(GraphicsConfiguration cfg,
              Rectangle captureArea,
              Format fileFormat,
              Format screenFormat,
              Format mouseFormat,
              Format audioFormat)
               throws IOException,
                      AWTException

Creates a screen recorder.

Parameters:

cfg - Graphics configuration of the capture screen.

captureArea - Defines the area of the screen that shall be captured.

fileFormat - The file format "AVI" or "QuickTime".

screenFormat - The video format for screen capture.

mouseFormat - The video format for mouse capture. The EncodingKey must be ENCODING_BLACK_CURSOR or ENCODING_WHITE_CURSOR. The SampleRateKey can be independent from the screenFormat. Specify null if you don't want to capture the mouse cursor.

audioFormat - The audio format for audio capture. Specify null if you don't want audio capture.

Throws:

IOException

AWTException

ScreenRecorder

public ScreenRecorder(GraphicsConfiguration cfg,
              Rectangle captureArea,
              Format fileFormat,
              Format screenFormat,
              Format mouseFormat,
              Format audioFormat,
              File movieFolder)
               throws IOException,
                      AWTException

Creates a screen recorder.

Parameters:

cfg - Graphics configuration of the capture screen.

captureArea - Defines the area of the screen that shall be captured.

fileFormat - The file format "AVI" or "QuickTime".

screenFormat - The video format for screen capture.

mouseFormat - The video format for mouse capture. The EncodingKey must be ENCODING_BLACK_CURSOR or ENCODING_WHITE_CURSOR. The SampleRateKey can be independent from the screenFormat. Specify null if you don't want to capture the mouse cursor.

audioFormat - The audio format for audio capture. Specify null if you don't want audio capture.

movieFolder - Where to store the movie

Throws:

IOException

AWTException

Method Detail

createMovieWriter

protected MovieWriter createMovieWriter()
                                 throws IOException

Throws:

IOException

getCreatedMovieFiles

public List<File> getCreatedMovieFiles()

Returns a list of all files that the screen recorder created.

createMovieFile

protected File createMovieFile(Format fileFormat)
                        throws IOException

Creates a file for recording the movie.

This implementation creates a file in the users "Video" folder on Windows, or in the users "Movies" folders on Mac OS X.

You can override this method, if you would like to create a movie file at a different location.

Parameters:

fileFormat -

Returns:

the file

Throws:

IOException

getState

public ScreenRecorder.State getState()

Returns the state of the recorder.

getStateMessage

public String getStateMessage()

Returns the state of the recorder.

getStartTime

public long getStartTime()

start

public void start()
           throws IOException

Starts the screen recorder.

Throws:

IOException

startMouseCapture

protected void startMouseCapture()
                          throws IOException

Starts mouse capture.

Throws:

IOException

stopMouseCapture

protected void stopMouseCapture()

Stops mouse capturing. Use method waitUntilMouseCaptureStopped() to wait until the capturing stopped.

waitUntilMouseCaptureStopped

protected void waitUntilMouseCaptureStopped()
                                     throws InterruptedException

Waits until mouse capturing stopped. Invoke this method only after you invoked stopMouseCapture().

Throws:

InterruptedException

getAudioLevelLeft

public float getAudioLevelLeft()

Returns the audio level of the left channel or of the mono channel.

Returns:

A value in the range [0.0,1.0] or AudioSystem.NOT_SPECIFIED.

getAudioLevelRight

public float getAudioLevelRight()

Returns the audio level of the right channel.

Returns:

A value in the range [0.0,1.0] or AudioSystem.NOT_SPECIFIED.

stop

public void stop()
          throws IOException

Stops the screen recorder.

Stopping the screen recorder may take several seconds, because audio capture uses a large capture buffer. Also, the MovieWriter has to finish up a movie file which may take some time depending on the amount of meta-data that needs to be written.

Throws:

IOException

write

protected void write(Buffer buf)
              throws IOException,
                     InterruptedException

Writes a buffer into the movie. Since the file system may not be immediately available at all times, we do this asynchronously.

The buffer is copied and passed to the writer queue, which is consumed by the writer thread. See method startWriter().

AVI does not support a variable frame rate for the video track. Since we can not capture frames at a fixed frame rate we have to resend the same captured screen multiple times to the writer.

This method is called asynchronously from different threads.

You can override this method if you wish to process the media data.

Parameters:

buf - A buffer with un-encoded media data. If buf.track==videoTrack, then the buffer contains a BufferedImage in buffer.data and a Point in buffer.header with the recorded mouse location. The header is null if the mouse is outside the capture area, or mouse recording has not been enabled.

Throws:

IOException

InterruptedException

getMaxRecordingTime

public long getMaxRecordingTime()

Maximal recording time in milliseconds. If this time is exceeded, the recorder creates a new file.

setMaxRecordingTime

public void setMaxRecordingTime(long maxRecordingTime)

Maximal recording time in milliseconds.

getMaxFileSize

public long getMaxFileSize()

Maximal file size. If this size is exceeded, the recorder creates a new file.

setMaxFileSize

public void setMaxFileSize(long maxFileSize)

getAudioMixer

public Mixer getAudioMixer()

Gets the audio mixer used for sound input. Returns null, if the default mixer is used.

setAudioMixer

public void setAudioMixer(Mixer mixer)

Sets the audio mixer for sound input. Set to null for the default audio mixer.