FakeAdaptiveMediaPeriod

Artifact: androidx.media3:media3-test-utils

Kotlin |Java

@UnstableApi
public class FakeAdaptiveMediaPeriod implements MediaPeriod, SequenceableLoader.Callback

Fake MediaPeriod that provides tracks from the given TrackGroupArray. Selecting a track will give the player a ChunkSampleStream.

Summary

Public constructors
`FakeAdaptiveMediaPeriod( TrackGroupArray trackGroupArray, MediaSourceEventListener.EventDispatcher mediaSourceEventDispatcher, Allocator allocator, FakeChunkSource.Factory chunkSourceFactory, long durationUs, @Nullable TransferListener transferListener )`

Public methods
`boolean`	`continueLoading(LoadingInfo loadingInfo)` Attempts to continue loading.
`void`	`discardBuffer(long positionUs, boolean toKeyframe)` Discards buffered media up to the specified position.
`long`	`getAdjustedSeekPositionUs( long positionUs, SeekParameters seekParameters )` Returns the position to which a seek will be performed, given the specified seek position and `SeekParameters`.
`long`	`getBufferedPositionUs()` Returns an estimate of the position up to which data is buffered for the enabled tracks.
`long`	`getNextLoadPositionUs()` Returns the next load time, or `TIME_END_OF_SOURCE` if loading has finished.
`TrackGroupArray`	`getTrackGroups()` Returns the `TrackGroup`s exposed by the period.
`boolean`	`isLoading()` Returns whether the media period is currently loading.
`void`	`maybeThrowPrepareError()` Throws an error that's preventing the period from becoming prepared.
`void`	`onContinueLoadingRequested(ChunkSampleStream<FakeChunkSource> source)` Called by the loader to indicate that it wishes for its `continueLoading` method to be called when it can continue to load data.
`void`	`prepare(MediaPeriod.Callback callback, long positionUs)` Prepares this media period asynchronously.
`long`	`readDiscontinuity()` Attempts to read a discontinuity.
`void`	`reevaluateBuffer(long positionUs)` Re-evaluates the buffer given the playback position.
`void`	`release()` Releases the media period.
`long`	`seekToUs(long positionUs)` Attempts to seek to the specified position in microseconds.
`long`	`selectTracks( @NullableType ExoTrackSelection[] selections, boolean[] mayRetainStreamFlags, @NullableType SampleStream[] streams, boolean[] streamResetFlags, long positionUs )` Performs a track selection.

Inherited methods

From androidx.media3.exoplayer.source.MediaPeriod

List<StreamKey>

getStreamKeys(List<ExoTrackSelection> trackSelections)

Returns a list of StreamKeys which allow to filter the media in this period to load only the parts needed to play the provided TrackSelections.

Public constructors

FakeAdaptiveMediaPeriod

public FakeAdaptiveMediaPeriod(
    TrackGroupArray trackGroupArray,
    MediaSourceEventListener.EventDispatcher mediaSourceEventDispatcher,
    Allocator allocator,
    FakeChunkSource.Factory chunkSourceFactory,
    long durationUs,
    @Nullable TransferListener transferListener
)

Public methods

continueLoading

public boolean continueLoading(LoadingInfo loadingInfo)

Attempts to continue loading.

This method may be called both during and after the period has been prepared.

A period may call onContinueLoadingRequested on the Callback passed to prepare to request that this method be called when the period is permitted to continue loading data. A period may do this both during and after preparation.

Parameters
`LoadingInfo loadingInfo`	The `LoadingInfo` when attempting to continue loading.

Returns
`boolean`	True if progress was made, meaning that `getNextLoadPositionUs` will return a different value than prior to the call. False otherwise.

discardBuffer

public void discardBuffer(long positionUs, boolean toKeyframe)

Discards buffered media up to the specified position.

This method is only called after the period has been prepared.

Parameters
`long positionUs`	The position in microseconds.
`boolean toKeyframe`	If true then for each track discards samples up to the keyframe before or at the specified position, rather than any sample before or at that position.

getAdjustedSeekPositionUs

public long getAdjustedSeekPositionUs(
    long positionUs,
    SeekParameters seekParameters
)

Returns the position to which a seek will be performed, given the specified seek position and SeekParameters.

This method is only called after the period has been prepared.

Parameters
`long positionUs`	The seek position in microseconds.
`SeekParameters seekParameters`	Parameters that control how the seek is performed. Implementations may apply seek parameters on a best effort basis.

Returns
`long`	The actual position to which a seek will be performed, in microseconds.

getBufferedPositionUs

public long getBufferedPositionUs()

Returns an estimate of the position up to which data is buffered for the enabled tracks.

This method is only called when at least one track is selected.

Returns
`long`	An estimate of the absolute position in microseconds up to which data is buffered, or `TIME_END_OF_SOURCE` if the track is fully buffered.

getNextLoadPositionUs

public long getNextLoadPositionUs()

Returns the next load time, or TIME_END_OF_SOURCE if loading has finished.

This method is only called after the period has been prepared. It may be called when no tracks are selected.

getTrackGroups

public TrackGroupArray getTrackGroups()

Returns the TrackGroups exposed by the period.

This method is only called after the period has been prepared.

Returns
`TrackGroupArray`	The `TrackGroup`s.

isLoading

public boolean isLoading()

Returns whether the media period is currently loading.

maybeThrowPrepareError

public void maybeThrowPrepareError()

Throws an error that's preventing the period from becoming prepared. Does nothing if no such error exists.

This method is only called before the period has completed preparation.

Throws
`java.io.IOException`	The underlying error.

onContinueLoadingRequested

public void onContinueLoadingRequested(ChunkSampleStream<FakeChunkSource> source)

Called by the loader to indicate that it wishes for its continueLoading method to be called when it can continue to load data. Called on the playback thread.

prepare

public void prepare(MediaPeriod.Callback callback, long positionUs)

Prepares this media period asynchronously.

callback.onPrepared is called when preparation completes. If preparation fails, maybeThrowPrepareError will throw an IOException.

If preparation succeeds and results in a source timeline change (e.g. the period duration becoming known), onSourceInfoRefreshed will be called before callback.onPrepared.

Parameters
`MediaPeriod.Callback callback`	Callback to receive updates from this period, including being notified when preparation completes.
`long positionUs`	The expected starting position, in microseconds.

readDiscontinuity

public long readDiscontinuity()

Attempts to read a discontinuity.

A discontinuity implies that the provided SampleStreams will start from a new playback position and any output pipelines need to be reset. This happens for example if the streams provide decode-only samples before the intended playback start position that need to be dropped.

After this method has returned a value other than TIME_UNSET, all SampleStreams provided by the period are guaranteed to start from a key frame.

This method is only called after the period has been prepared.

Returns
`long`	The playback position after the discontinuity, in microseconds, or `TIME_UNSET` if there is no discontinuity.

reevaluateBuffer

public void reevaluateBuffer(long positionUs)

Re-evaluates the buffer given the playback position.

This method is only called after the period has been prepared.

A period may choose to discard buffered media or cancel ongoing loads so that media can be re-buffered in a different quality.

Parameters
`long positionUs`	The current playback position in microseconds. If playback of this period has not yet started, the value will be the starting position in this period minus the duration of any media in previous periods still to be played.

release

public void release()

Releases the media period.

seekToUs

public long seekToUs(long positionUs)

Attempts to seek to the specified position in microseconds.

After this method has been called, all SampleStreams provided by the period are guaranteed to start from a key frame.

This method is only called when at least one track is selected.

Parameters
`long positionUs`	The seek position in microseconds.

Returns
`long`	The actual position to which the period was seeked, in microseconds.

selectTracks

public long selectTracks(
    @NullableType ExoTrackSelection[] selections,
    boolean[] mayRetainStreamFlags,
    @NullableType SampleStream[] streams,
    boolean[] streamResetFlags,
    long positionUs
)

Performs a track selection.

The call receives track selections for each renderer, mayRetainStreamFlags indicating whether the existing SampleStream can be retained for each selection, and the existing streams themselves. The call will update streams to reflect the provided selections, clearing, setting and replacing entries as required. If an existing sample stream is retained but with the requirement that the consuming renderer be reset, then the corresponding flag in streamResetFlags will be set to true. This flag will also be set if a new sample stream is created.

Note that previously passed TrackSelections are no longer valid, and any references to them must be updated to point to the new selections.

This method is only called after the period has been prepared.

Parameters
`@NullableType ExoTrackSelection[] selections`	The renderer track selections.
`boolean[] mayRetainStreamFlags`	Flags indicating whether the existing sample stream can be retained for each track selection. A `true` value indicates that the selection is equivalent to the one that was previously passed, and that the caller does not require that the sample stream be recreated. If a retained sample stream holds any references to the track selection then they must be updated to point to the new selection.
`@NullableType SampleStream[] streams`	The existing sample streams, which will be updated to reflect the provided selections.
`boolean[] streamResetFlags`	Will be updated to indicate new sample streams, and sample streams that have been retained but with the requirement that the consuming renderer be reset.
`long positionUs`	The current playback position in microseconds. If playback of this period has not yet started, the value will be the starting position.

Returns
`long`	The actual position at which the tracks were enabled, in microseconds.