com.google.android.exoplayer2.video.spherical

Class FrameRotationQueue

java.lang.Object

com.google.android.exoplayer2.video.spherical.FrameRotationQueue

public final class FrameRotationQueue
extends java.lang.Object

This class serves multiple purposes:

• Queues the rotation metadata extracted from camera motion track.
• Converts the metadata to rotation matrices in OpenGl coordinate system.
• Recenters the rotations to componsate the yaw of the initial rotation.

Constructor Summary

Constructors

Constructor and Description
FrameRotationQueue()

Method Summary

Modifier and Type	Method and Description
boolean	pollRotationMatrix(float[] matrix, long timestampUs) Copies the rotation matrix with the greatest timestamp which is less than or equal to the given timestamp to matrix.
void	reset() Removes all of the rotations and forces rotations to be recentered.
void	setRotation(long timestampUs, float[] angleAxis) Sets a rotation for a given timestamp.

Methods inherited from class java.lang.Object

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

Constructor Detail

FrameRotationQueue

public FrameRotationQueue()

Method Detail

setRotation

public void setRotation(long timestampUs,
                        float[] angleAxis)

Sets a rotation for a given timestamp.

Parameters:

timestampUs - Timestamp of the rotation.

angleAxis - Angle axis orientation in radians representing the rotation from camera coordinate system to world coordinate system.

reset

public void reset()

Removes all of the rotations and forces rotations to be recentered.

pollRotationMatrix

public boolean pollRotationMatrix(float[] matrix,
                                  long timestampUs)

Copies the rotation matrix with the greatest timestamp which is less than or equal to the given timestamp to matrix. Removes all older rotations and the returned one from the queue. Does nothing if there is no such rotation.

Parameters:

matrix - A float array to hold the rotation matrix.

timestampUs - The time in microseconds to query the rotation.

Returns:

Whether a rotation matrix is copied to matrix.