com.google.android.exoplayer2.extractor

Class ConstantBitrateSeekMap

java.lang.Object

com.google.android.exoplayer2.extractor.ConstantBitrateSeekMap

All Implemented Interfaces:

SeekMap

public class ConstantBitrateSeekMap
extends java.lang.Object
implements SeekMap

A SeekMap implementation that assumes the stream has a constant bitrate and consists of multiple independent frames of the same size. Seek points are calculated to be at frame boundaries.

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.android.exoplayer2.extractor.SeekMap

SeekMap.SeekPoints, SeekMap.Unseekable

Constructor Summary

Constructors

Constructor and Description
ConstantBitrateSeekMap(long inputLength, long firstFrameBytePosition, int bitrate, int frameSize) Constructs a new instance from a stream.

Method Summary

Modifier and Type	Method and Description
long	getDurationUs() Returns the duration of the stream in microseconds.
SeekMap.SeekPoints	getSeekPoints(long timeUs) Obtains seek points for the specified seek time in microseconds.
long	getTimeUsAtPosition(long position) Returns the stream time in microseconds for a given position.
boolean	isSeekable() Returns whether seeking is supported.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantBitrateSeekMap

public ConstantBitrateSeekMap(long inputLength,
                              long firstFrameBytePosition,
                              int bitrate,
                              int frameSize)

Constructs a new instance from a stream.

Parameters:

inputLength - The length of the stream in bytes, or C.LENGTH_UNSET if unknown.

firstFrameBytePosition - The byte-position of the first frame in the stream.

bitrate - The bitrate (which is assumed to be constant in the stream).

frameSize - The size of each frame in the stream in bytes. May be C.LENGTH_UNSET if unknown.

Method Detail

isSeekable

public boolean isSeekable()

Description copied from interface: SeekMap

Returns whether seeking is supported.

Specified by:

isSeekable in interface SeekMap

Returns:

Whether seeking is supported.

getSeekPoints

public SeekMap.SeekPoints getSeekPoints(long timeUs)

Description copied from interface: SeekMap

Obtains seek points for the specified seek time in microseconds. The returned SeekMap.SeekPoints will contain one or two distinct seek points.

Two seek points [A, B] are returned in the case that seeking can only be performed to discrete points in time, there does not exist a seek point at exactly the requested time, and there exist seek points on both sides of it. In this case A and B are the closest seek points before and after the requested time. A single seek point is returned in all other cases.

Specified by:

getSeekPoints in interface SeekMap

Parameters:

timeUs - A seek time in microseconds.

Returns:

The corresponding seek points.

getDurationUs

public long getDurationUs()

Description copied from interface: SeekMap

Returns the duration of the stream in microseconds.

Specified by:

getDurationUs in interface SeekMap

Returns:

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

getTimeUsAtPosition

public long getTimeUsAtPosition(long position)

Returns the stream time in microseconds for a given position.

Parameters:

position - The stream byte-position.

Returns:

The stream time in microseconds for the given position.