ConstantBitrateSeekMap

Artifact: androidx.media3:media3-extractor

Kotlin |Java

@UnstableApi
public class ConstantBitrateSeekMap 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.

Summary

Public fields
`final long`	`durationUs`

Public constructors
`ConstantBitrateSeekMap( long inputLength, long firstFrameBytePosition, int bitrate, int frameSize )` Creates an instance with `allowSeeksIfLengthUnknown` set to `false`.
`ConstantBitrateSeekMap( long inputLength, long firstFrameBytePosition, int bitrate, int frameSize, boolean allowSeeksIfLengthUnknown )` Creates an instance.

Public methods
`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.

Public fields

durationUs

public final long durationUs

Public constructors

ConstantBitrateSeekMap

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

Creates an instance with allowSeeksIfLengthUnknown set to false.

Parameters
`long inputLength`	The length of the stream in bytes, or `LENGTH_UNSET` if unknown.
`long firstFrameBytePosition`	The byte-position of the first frame in the stream.
`int bitrate`	The bitrate (which is assumed to be constant in the stream).
`int frameSize`	The size of each frame in the stream in bytes. May be `LENGTH_UNSET` if unknown.

ConstantBitrateSeekMap

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

Creates an instance.

Parameters
`long inputLength`	The length of the stream in bytes, or `LENGTH_UNSET` if unknown.
`long firstFrameBytePosition`	The byte-position of the first frame in the stream.
`int bitrate`	The bitrate (which is assumed to be constant in the stream).
`int frameSize`	The size of each frame in the stream in bytes. May be `LENGTH_UNSET` if unknown.
`boolean allowSeeksIfLengthUnknown`	Whether to allow seeking even if the length of the content is unknown.

Public methods

getDurationUs

public long getDurationUs()

Returns the duration of the stream in microseconds.

Returns
`long`	The duration of the stream in microseconds, or `TIME_UNSET` if the duration is unknown.

getSeekPoints

public SeekMap.SeekPoints getSeekPoints(long timeUs)

Obtains seek points for the specified seek time in microseconds. The returned 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.

Parameters
`long timeUs`	A seek time in microseconds.

Returns
`SeekMap.SeekPoints`	The corresponding seek points.

getTimeUsAtPosition

public long getTimeUsAtPosition(long position)

Returns the stream time in microseconds for a given position.

Parameters
`long position`	The stream byte-position.

Returns
`long`	The stream time in microseconds for the given position.

isSeekable

public boolean isSeekable()

Returns whether seeking is supported.

Returns
`boolean`	Whether seeking is supported.