# ChunkIndex

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/ChunkIndex.java+class:androidx.media3.extractor.ChunkIndex)

*** ** * ** ***


```
@UnstableApi
public final class ChunkIndex implements SeekMap
```

<br />

*** ** * ** ***

Defines chunks of samples within a media stream.

## Summary

| ### Public fields |
|---|---|
| `final long` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#durationUs()` |
| `final long[]` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#durationsUs()` The chunk durations, in microseconds. |
| `final int` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#length()` The number of chunks. |
| `final long[]` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#offsets()` The chunk byte offsets. |
| `final int[]` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#sizes()` The chunk sizes, in bytes. |
| `final long[]` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#timesUs()` The start time of each chunk, in microseconds. |

| ### Public constructors |
|---|
| `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#ChunkIndex(int[],long[],long[],long[])( int[] sizes, long[] offsets, long[] durationsUs, long[] timesUs )` |

| ### Public methods |
|---|---|
| `int` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#getChunkIndex(long)(long timeUs)` Obtains the index of the chunk corresponding to a given time. |
| `long` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#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/ChunkIndex#getSeekPoints(long)(long timeUs)` Obtains seek points for the specified seek time in microseconds. |
| `boolean` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#isSeekable()()` Returns whether seeking is supported. |
| `https://developer.android.com/reference/java/lang/String.html` | `https://developer.android.com/reference/androidx/media3/extractor/ChunkIndex#toString()()` |

| ### Inherited methods |
|---|
| From [androidx.media3.extractor.SeekMap](https://developer.android.com/reference/androidx/media3/extractor/SeekMap) |---|---| | `boolean` | `https://developer.android.com/reference/androidx/media3/extractor/SeekMap#isEstimated()()` Returns whether this `https://developer.android.com/reference/androidx/media3/extractor/SeekMap` is based on estimations. | |

## Public fields

### durationUs

```
public final long durationUs
```

### durationsUs

```
public final long[] durationsUs
```

The chunk durations, in microseconds.

### length

```
public final int length
```

The number of chunks.

### offsets

```
public final long[] offsets
```

The chunk byte offsets.

### sizes

```
public final int[] sizes
```

The chunk sizes, in bytes.

### timesUs

```
public final long[] timesUs
```

The start time of each chunk, in microseconds.

## Public constructors

### ChunkIndex

```
public ChunkIndex(
    int[] sizes,
    long[] offsets,
    long[] durationsUs,
    long[] timesUs
)
```

| Parameters |
|---|---|
| `int[] sizes` | The chunk sizes, in bytes. |
| `long[] offsets` | The chunk byte offsets. |
| `long[] durationsUs` | The chunk durations, in microseconds. |
| `long[] timesUs` | The start time of each chunk, in microseconds. |

## Public methods

### getChunkIndex

```
public int getChunkIndex(long timeUs)
```

Obtains the index of the chunk corresponding to a given time.

| Parameters |
|---|---|
| `long timeUs` | The time, in microseconds. |

| Returns |
|---|---|
| `int` | The index of the corresponding chunk. |

### 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. |

### isSeekable

```
public boolean isSeekable()
```

Returns whether seeking is supported.

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

### toString

```
public String toString()
```