com.google.android.exoplayer2.extractor.mp4

Class Track

java.lang.Object

com.google.android.exoplayer2.extractor.mp4.Track

public final class Track
extends Object

Encapsulates information describing an MP4 track.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Track.Transformation The transformation to apply to samples in the track, if any.

Field Summary

Fields

Modifier and Type	Field and Description
long	durationUs The duration of the track in microseconds, or C.TIME_UNSET if unknown.
long[]	editListDurations Durations of edit list segments in the movie timescale.
long[]	editListMediaTimes Media times for edit list segments in the track timescale.
Format	format The format.
int	id The track identifier.
long	movieTimescale The movie timescale.
int	nalUnitLengthFieldLength For H264 video tracks, the length in bytes of the NALUnitLength field in each sample.
int	sampleTransformation One of TRANSFORMATION_*.
long	timescale The track timescale, defined as the number of time units that pass in one second.
static int	TRANSFORMATION_CEA608_CDAT A transformation for caption samples in cdat atoms.
static int	TRANSFORMATION_NONE A no-op sample transformation.
int	type One of C.TRACK_TYPE_AUDIO, C.TRACK_TYPE_VIDEO and C.TRACK_TYPE_TEXT.

Constructor Summary

Constructors

Constructor and Description
Track(int id, int type, long timescale, long movieTimescale, long durationUs, Format format, int sampleTransformation, TrackEncryptionBox[] sampleDescriptionEncryptionBoxes, int nalUnitLengthFieldLength, long[] editListDurations, long[] editListMediaTimes)

Method Summary

Modifier and Type	Method and Description
TrackEncryptionBox	getSampleDescriptionEncryptionBox(int sampleDescriptionIndex) Returns the TrackEncryptionBox for the given sample description index.

Methods inherited from class java.lang.Object

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

Field Detail

TRANSFORMATION_NONE

public static final int TRANSFORMATION_NONE

A no-op sample transformation.

See Also:

Constant Field Values

TRANSFORMATION_CEA608_CDAT

public static final int TRANSFORMATION_CEA608_CDAT

A transformation for caption samples in cdat atoms.

See Also:

Constant Field Values

id

public final int id

The track identifier.

type

public final int type

One of C.TRACK_TYPE_AUDIO, C.TRACK_TYPE_VIDEO and C.TRACK_TYPE_TEXT.

timescale

public final long timescale

The track timescale, defined as the number of time units that pass in one second.

movieTimescale

public final long movieTimescale

The movie timescale.

durationUs

public final long durationUs

The duration of the track in microseconds, or C.TIME_UNSET if unknown.

format

public final Format format

The format.

sampleTransformation

public final int sampleTransformation

One of TRANSFORMATION_*. Defines the transformation to apply before outputting each sample.

editListDurations

public final long[] editListDurations

Durations of edit list segments in the movie timescale. Null if there is no edit list.

editListMediaTimes

public final long[] editListMediaTimes

Media times for edit list segments in the track timescale. Null if there is no edit list.

nalUnitLengthFieldLength

public final int nalUnitLengthFieldLength

For H264 video tracks, the length in bytes of the NALUnitLength field in each sample. 0 for other track types.

Constructor Detail

Track

public Track(int id,
             int type,
             long timescale,
             long movieTimescale,
             long durationUs,
             Format format,
             int sampleTransformation,
             @Nullable
             TrackEncryptionBox[] sampleDescriptionEncryptionBoxes,
             int nalUnitLengthFieldLength,
             long[] editListDurations,
             long[] editListMediaTimes)

Method Detail

getSampleDescriptionEncryptionBox

public TrackEncryptionBox getSampleDescriptionEncryptionBox(int sampleDescriptionIndex)

Returns the TrackEncryptionBox for the given sample description index.

Parameters:

sampleDescriptionIndex - The given sample description index

Returns:

The TrackEncryptionBox for the given sample description index. Maybe null if no such entry exists.