# ConstantBitrateSeekMap

Artifact: [androidx.media3:media3-extractor](https://developer.android.com/jetpack/androidx/releases/media3) [View Source](https://cs.android.com/search?q=file:androidx/media3/extractor/ConstantBitrateSeekMap.java+class:androidx.media3.extractor.ConstantBitrateSeekMap)

*** ** * ** ***


```
@UnstableApi
public class ConstantBitrateSeekMap implements SeekMap
```

<br />

*** ** * ** ***

A `https://developer.android.com/reference/androidx/media3/extractor/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` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#durationUs()` |
| `final boolean` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#isEstimated()` |

| ### Protected fields |
|---|---|
| `final int` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#bitrate()` |
| `final int` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#frameSize()` |

| ### Public constructors |
|---|
| `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#ConstantBitrateSeekMap(long,long,int,int)( long inputLength, long firstFrameBytePosition, int bitrate, int frameSize )` Creates an instance with `allowSeeksIfLengthUnknown` set to `false`. |
| `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#ConstantBitrateSeekMap(long,long,int,int,boolean)( long inputLength, long firstFrameBytePosition, int bitrate, int frameSize, boolean allowSeeksIfLengthUnknown )` Creates an instance. |

| ### Protected constructors |
|---|
| `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#ConstantBitrateSeekMap(long,long,int,int,boolean,boolean)( long inputLength, long firstFrameBytePosition, int bitrate, int frameSize, boolean allowSeeksIfLengthUnknown, boolean isEstimated )` Creates an instance. |

| ### Public methods |
|---|---|
| `long` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#getDurationUs()()` Returns the duration of the stream in microseconds. |
| `https://developer.android.com/reference/androidx/media3/extractor/SeekMap.SeekPoints` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#getSeekPoints(long)(long timeUs)` Obtains seek points for the specified seek time in microseconds. |
| `long` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#getTimeUsAtPosition(long)(long position)` Returns the stream time in microseconds for a given position. |
| `boolean` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#isEstimated()()` Returns whether this `https://developer.android.com/reference/androidx/media3/extractor/SeekMap` is based on estimations. |
| `boolean` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#isSeekable()()` Returns whether seeking is supported. |

| ### Protected methods |
|---|---|
| `final int` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#getBitrate()()` Returns the bitrate of the stream (as passed to the constructor). |
| `final long` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#getFirstFramePosition()()` Returns the byte position of the first frame in the stream (as passed to the constructor). |
| `final int` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#getFrameSize()()` Returns the size of each frame in the stream in bytes, or `1` if `https://developer.android.com/reference/androidx/media3/common/C#LENGTH_UNSET()` was passed to the constructor. |
| `final boolean` | `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap#shouldAllowSeeksIfLengthUnknown()()` Returns whether seeking is permitted if the stream length is unknown (as passed to the constructor). |

## Public fields

### durationUs

```
public final long durationUs
```

### isEstimated

```
public final boolean isEstimated
```

## Protected fields

### bitrate

```
protected final int bitrate
```

### frameSize

```
protected final int frameSize
```

## 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 `https://developer.android.com/reference/androidx/media3/common/C#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 `https://developer.android.com/reference/androidx/media3/common/C#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 `https://developer.android.com/reference/androidx/media3/common/C#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 `https://developer.android.com/reference/androidx/media3/common/C#LENGTH_UNSET()` if unknown. |
| `boolean allowSeeksIfLengthUnknown` | Whether to allow seeking even if the length of the content is unknown. |

## Protected constructors

### ConstantBitrateSeekMap

```
protected ConstantBitrateSeekMap(
    long inputLength,
    long firstFrameBytePosition,
    int bitrate,
    int frameSize,
    boolean allowSeeksIfLengthUnknown,
    boolean isEstimated
)
```

Creates an instance.

| Parameters |
|---|---|
| `long inputLength` | The length of the stream in bytes, or `https://developer.android.com/reference/androidx/media3/common/C#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 `https://developer.android.com/reference/androidx/media3/common/C#LENGTH_UNSET()` if unknown. |
| `boolean allowSeeksIfLengthUnknown` | Whether to allow seeking even if the length of the content is unknown. |
| `boolean isEstimated` | Whether this `https://developer.android.com/reference/androidx/media3/extractor/ConstantBitrateSeekMap` is based on estimations. |

## Public methods

### getDurationUs

```
public long getDurationUs()
```

Returns the duration of the stream in microseconds.

| Returns |
|---|---|
| `long` | The duration of the stream in microseconds, or `https://developer.android.com/reference/androidx/media3/common/C#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 `https://developer.android.com/reference/androidx/media3/extractor/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.

| Parameters |
|---|---|
| `long timeUs` | A seek time in microseconds. |

| Returns |
|---|---|
| `https://developer.android.com/reference/androidx/media3/extractor/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. |

### isEstimated

```
public boolean isEstimated()
```

Returns whether this `https://developer.android.com/reference/androidx/media3/extractor/SeekMap` is based on estimations. The default value is `
false`.

An example of this is depending on the declared byte length of a stream or file, rather than a media byte length derived from metadata from within the stream itself.

### isSeekable

```
public boolean isSeekable()
```

Returns whether seeking is supported.

| Returns |
|---|---|
| `boolean` | Whether seeking is supported. |

## Protected methods

### getBitrate

```
protected final int getBitrate()
```

Returns the bitrate of the stream (as passed to the constructor).

### getFirstFramePosition

```
protected final long getFirstFramePosition()
```

Returns the byte position of the first frame in the stream (as passed to the constructor).

### getFrameSize

```
protected final int getFrameSize()
```

Returns the size of each frame in the stream in bytes, or `1` if `https://developer.android.com/reference/androidx/media3/common/C#LENGTH_UNSET()` was passed to the constructor.

### shouldAllowSeeksIfLengthUnknown

```
protected final boolean shouldAllowSeeksIfLengthUnknown()
```

Returns whether seeking is permitted if the stream length is unknown (as passed to the constructor).