mediaframe.mpeg1
Class Element

java.lang.Object
  |
  +--mediaframe.mpeg1.Element

class Element

extends java.lang.Object

The class "Element" stores the information of a single frame. Exactly "MAXELEMENT" objects of this class exist in an array "EL_ARR[]" which is used in wrap around manner. The pixels are given as YUV values and they are then translated into the Java-AWT RGB model.

Field Summary

private static int	CB_DIFF_FAC The coefficient for Cb value for G color calculation (0.34414 * 2^12).
private static int	CB_FAC The coefficient for Cb value for B color calculation (1.772*2^12).
private static int	CR_DIFF_FAC The coefficient for Cr value for G color calculation (0.71414 * 2^12).
private static int	CR_FAC The coefficient for Cr value for R color calculation (1.402*2^12).
private static int	CY_FAC The coefficient for Y' value for colors calculation (1.023*2^12).
int	Frame_idx Notice the frame number (display order).
int	Frame_type The type of the frame (I, B or P).
private int	h The height dimension of the frame pixels array.
private int	picRate The amount of frames per second.
int[]	Pix_Map The pixels in Java RGB model.
private long	pts Presentation timestamp (in milliseconds).
private int	sc_x The width screen dimension.
private int	sc_y The height screen dimension.
private boolean	scaled_x Flag, indicates that the frame should be scaled by width.
private boolean	scaled_y Flag, indicates that the frame should be scaled by height.
private long	step_x The x step (equals to w / sc_x) between pixel columns.
private long	step_y The y step (equals to h / sc_y) between pixel rows.
private int	w The width dimension of the frame pixels array.

Constructor Summary

(package private)

Element(MPEG1 app, java.awt.image.ColorModel cm, int w, int h, int o_w, int o_h, int sc_x, int sc_y) Constructs an Element object.

Method Summary

protected int	getPicRate() Gets the amount of frames per second value.
protected long	getPts() Gets the time in milliseconds that this element is to be displayed.
void	Make_Picture(int[][] Pixels) The method "Make_Picture" is called every time the scanner has decoded a frame.
protected void	setPicRate(int _picRate) Sets the amount of frames per second.
protected void	setPts(long presentation_time_stamp) Sets the time in milliseconds that this element is to be displayed.

Methods inherited from class java.lang.Object

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

Field Detail

Frame_idx

public int Frame_idx

Notice the frame number (display order).

Frame_type

public int Frame_type

The type of the frame (I, B or P).

Pix_Map

public int[] Pix_Map

The pixels in Java RGB model.

CY_FAC

private static final int CY_FAC

The coefficient for Y' value for colors calculation (1.023*2^12).

See Also:

Constant Field Values

CR_FAC

private static final int CR_FAC

The coefficient for Cr value for R color calculation (1.402*2^12).

See Also:

Constant Field Values

CB_FAC

private static final int CB_FAC

The coefficient for Cb value for B color calculation (1.772*2^12).

See Also:

Constant Field Values

CR_DIFF_FAC

private static final int CR_DIFF_FAC

The coefficient for Cr value for G color calculation (0.71414 * 2^12).

See Also:

Constant Field Values

CB_DIFF_FAC

private static final int CB_DIFF_FAC

The coefficient for Cb value for G color calculation (0.34414 * 2^12).

See Also:

Constant Field Values

w

private int w

The width dimension of the frame pixels array.

h

private int h

The height dimension of the frame pixels array.

scaled_x

private boolean scaled_x

Flag, indicates that the frame should be scaled by width.

scaled_y

private boolean scaled_y

Flag, indicates that the frame should be scaled by height.

sc_x

private int sc_x

The width screen dimension.

sc_y

private int sc_y

The height screen dimension.

step_x

private long step_x

The x step (equals to w / sc_x) between pixel columns.

step_y

private long step_y

The y step (equals to h / sc_y) between pixel rows.

pts

private long pts

Presentation timestamp (in milliseconds).

picRate

private int picRate

The amount of frames per second.

Constructor Detail

Element

Element(MPEG1 app,
        java.awt.image.ColorModel cm,
        int w,
        int h,
        int o_w,
        int o_h,
        int sc_x,
        int sc_y)

Constructs an Element object. Notices the frame sizes and produces an image and an array to store the RGB pixel values. The Applet (app) object is necessary to call the "createImage" routine.

Parameters:

app - the applet (app) object.

cm - the color model of the screen (RGB).

w - the width dimension of the frame pixels array.

h - the height dimension of the frame pixels array.

o_w - the width dimension of the movie frame.

o_h - the height dimension of the movie frame.

sc_x - the width screen dimension.

sc_y - the height screen dimension.

Method Detail

getPts

protected long getPts()

Gets the time in milliseconds that this element is to be displayed.

Returns:

the time in milliseconds that this element is to be displayed.

setPts

protected void setPts(long presentation_time_stamp)

Sets the time in milliseconds that this element is to be displayed.

Parameters:

presentation_time_stamp - the time in milliseconds to set.

setPicRate

protected void setPicRate(int _picRate)

Sets the amount of frames per second.

Parameters:

_picRate - the amount of frames per second to set.

getPicRate

protected int getPicRate()

Gets the amount of frames per second value.

Returns:

the amount of frames per second value.

Make_Picture

public void Make_Picture(int[][] Pixels)

The method "Make_Picture" is called every time the scanner has decoded a frame. It expects the frame information as YUV values and translates them into the Java RGB color system.

Parameters:

Pixels - the array of pixels as YUV values.