File	Doc	Category	Size	Date	Package
FramePositioningAdapter.java	API Doc	JMF 2.1.1e	4612	Mon May 12 12:20:56 BST 2003	com.sun.media.controls

FramePositioningAdapter

• java.lang.Object

Fields Summary
Object	owner
Player	player
Track	master
long	frameStep

Constructors Summary

public FramePositioningAdapter(Player p, Track track) this.player = p; this.master = track; // Base on the frame rate, compute the inter-frame duration. // This is not very accurate since the frame rate reported is not // very accurate anyway. Format f = track.getFormat(); if (f instanceof VideoFormat) { float rate = ((VideoFormat)f).getFrameRate(); if (rate != Format.NOT_SPECIFIED && rate != 0f) frameStep = (long)(Time.ONE_SECOND / rate); }

Methods Summary
public java.awt.Component	getControlComponent() return null;
public static javax.media.Track	getMasterTrack(javax.media.Track[] tracks) Track master = null; Format f; float rate = Format.NOT_SPECIFIED; for (int i = 0; i < tracks.length; i++) { if (tracks[i] == null || ((f = tracks[i].getFormat()) == null)) continue; if (!(f instanceof VideoFormat)) continue; master = tracks[i]; if ((rate = ((VideoFormat)f).getFrameRate()) != Format.NOT_SPECIFIED && rate != 0f) { return master; } } if (master != null && master.mapTimeToFrame(new Time(0)) != FramePositioningControl.FRAME_UNKNOWN) return master; else return null;
public java.lang.Object	getOwner() if (owner == null) return this; else return owner;
public javax.media.Time	mapFrameToTime(int frameNumber) Converts the given frame number to the corresponding media time. param frameNumber the input frame number for the conversion. return the converted media time for the given frame. If the conversion fails, TIME_UNKNOWN is returned. return master.mapFrameToTime(frameNumber);
public int	mapTimeToFrame(javax.media.Time mediaTime) Converts the given media time to the corresponding frame number. The frame returned is the nearest frame that has a media time less than or equal to the given media time. param mediaTime the input media time for the conversion. return the converted frame number the given media time. If the conversion fails, FRAME_UNKNOWN is returned. return master.mapTimeToFrame(mediaTime);
public int	seek(int frameNumber) Seek to a given video frame. param frameNumber the frame to seek to. return the actual frame that the Player has seeked to. Time seekTo = master.mapFrameToTime(frameNumber); if (seekTo != null && seekTo != FramePositioningControl.TIME_UNKNOWN) { player.setMediaTime(seekTo); return master.mapTimeToFrame(seekTo); } else { // Can't do any thing if mapFrameToTime fails. return FramePositioningControl.FRAME_UNKNOWN; }
public void	setOwner(java.lang.Object newOwner) owner = newOwner;
public int	skip(int framesToSkip) Skip a given number of frames from the current position. param framesToSkip the number of frames to skip from the current position. If framesToSkip is positive, it will seek forward by framesToSkip number of frames. If framesToSkip is negative, it will seek backward by framesToSkip number of frames. e.g. skip(-1) will step backward one frame. return the actual number of frames skipped. if (frameStep != -1) { // Use interframe duration. long t = player.getMediaNanoseconds() + (framesToSkip * frameStep); player.setMediaTime(new Time(t)); return framesToSkip; } else { int currentFrame = master.mapTimeToFrame(player.getMediaTime()); if (currentFrame != 0 && currentFrame != FramePositioningControl.FRAME_UNKNOWN) { int newFrame = seek(currentFrame+framesToSkip); return newFrame - currentFrame; } else { // Ran out of options. return FramePositioningControl.FRAME_UNKNOWN; } }