QuickTime for Java

QuickTime for Java is one of the powerful standards to handle multimedia resources.
Combination of the QuickTime and the Mathematica mades some interesting things easy, such as composing fractal music and movie image capturing.

Junzo SATO

Jul 18th 2003
Jun 10th 2002

•Installation

QuickTime for Java is available from the Apple computer's web site: http://www.apple.com/.
In this notebook, java2 (ver 1.4.1_01) and QuickTime for Java 6.0 is used.

•Loading J/Link

$If[$MachineType === "PC", SetOptions[InstallJava, CommandLine -> "C:\j2sdk1.4.1_01\bin\java.exe"]]$

${ClassPath -> Automatic, CommandLine -> C:\\j2sdk1.4.1_01\\bin\\java.exe, MicrosoftJava -> False, Java1 -> False}$

$LinkObject[C:\\j2sdk1.4.1_01\\bin\\java.exe, 2, 2]$

•Fractal Music with General MIDI

•Preparation

Open QTSession

•Play note with General MIDI

Create a ToneDescription of an instrument in General MIDI. The piano (#1) is chosen here.

NoteRequest and NoteChannel are prepared.

The function PlayNote[ ] is defined.

•Compose Fractal Music

$walk(β_) := Re(InverseFourier[Table[1/f^β^(1/2) gauss [[ f ]], {f, 1, 300}]])$

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•Play

•Dispose

Objects are released.

QTSessionを閉じる

•Control QuickTime Movie

A movie specified by the URL is played using QTPlayer.
MovieController controls movie frames.

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•Open QTSession

•Get the reference to the movie by specifying the URL

[Windows] c:\quicktime-for-java-sdk\media\jumps.mov
[MacOS X] /quicktime-for-java-sdk/media/jumps.mov

•Get Movie, MovieController, and QTPlayer.

•Show movie on QTCanvas

•Control movie frames

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Rewind to the beginning

Get time scale

Get total seconds

Calculate current second of the frame. If the beginning, the time is 0.

Forward the frames.

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Now the current second is increased.

Play movie with the rate 1.0.

If the rate is set to 0.0 in the middle of the play, the movie is stopped.

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Go to the end of the movie.

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Get the current time information of a frame.
This information is set to the captureThis for later use.

•Windows

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•MacOS X

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•Dispose

Objects are released.

Close QTSession

•Get JavaImage from QuickTime Movie (Frame Caputuring)

Using the QTImageProducer, a frame of the movis is derived as a JavaImage.

•Open QTSession

•Get QTFile

•Get movie by OpenMovieFile

Get Movie and MoviePlayer by opening the file.

Get image size of the movie.

Get time information

Specify the frame to be captured as a JavaImage. The captureThis was set by the previous example in this notebook.

•Windows

•MacOS X

•Create QTImageProducer

•Create the JavaImage and show it on the MathCanvas

Get the frame as the JavaImage

Show JavaImage on the MathCanvas.

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•Java Photo Editor and Digital Image Processing (Option)

If the user is using Java Photo Editor which is developed by the author, and Digital Image Processing package,
the captured JavaImage is ready to use for digital image processing operations.

[Graphics:HTMLFiles/index_147.gif]

$TryFilters[data_] := Show[GraphicsArray[Graphics /@ { data, DiscreteConvolve[data, BoxFilter[ ... 15, 7], Centered -> True], DiscreteConvolve[data, LoGFilter[15, 15], Centered -> True] }]]$

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