java.lang.Object
- com.google.android.exoplayer2.trackselection.TrackSelector
- - com.google.android.exoplayer2.trackselection.MappingTrackSelector
  - - com.google.android.exoplayer2.trackselection.DefaultTrackSelector

Direct Known Subclasses:

FakeTrackSelector
```
public class DefaultTrackSelector
extends MappingTrackSelector
```
A default TrackSelector suitable for most use cases.
Modifying parameters
Track selection parameters should be modified by obtaining a TrackSelectionParameters.Builder initialized with the current TrackSelectionParameters from the player. The desired modifications can be made on the builder, and the resulting TrackSelectionParameters can then be built and set on the player:
```
 player.setTrackSelectionParameters(
     player.getTrackSelectionParameters()
         .buildUpon()
         .setMaxVideoSizeSd()
         .setPreferredAudioLanguage("de")
         .build());

 
```
Some specialized parameters are only available in the extended DefaultTrackSelector.Parameters class, which can be retrieved and modified in a similar way in this track selector:
```
 defaultTrackSelector.setParameters(
     defaultTrackSelector.getParameters()
         .buildUpon()
         .setTunnelingEnabled(true)
         .build());

 
```

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`DefaultTrackSelector.Parameters`	Extends `DefaultTrackSelector.Parameters` by adding fields that are specific to `DefaultTrackSelector`.
`static class`	`DefaultTrackSelector.ParametersBuilder`	A builder for `DefaultTrackSelector.Parameters`.
`protected static interface`	`DefaultTrackSelector.SelectionEligibility`	The extent to which tracks are eligible for selection.
`static class`	`DefaultTrackSelector.SelectionOverride`	A track selection override.

Nested classes/interfaces inherited from class com.google.android.exoplayer2.trackselection.MappingTrackSelector
MappingTrackSelector.MappedTrackInfo

Nested classes/interfaces inherited from class com.google.android.exoplayer2.trackselection.TrackSelector
TrackSelector.InvalidationListener

Field Summary

Fields
Modifier and Type	Field	Description
`protected static int`	`SELECTION_ELIGIBILITY_ADAPTIVE`	Track is eligible for both a fixed selection and as part of an adaptive selection with multiple tracks.
`protected static int`	`SELECTION_ELIGIBILITY_FIXED`	Track is eligible for a fixed selection with one track.
`protected static int`	`SELECTION_ELIGIBILITY_NO`	Track is not eligible for selection.

Constructor Summary

Constructors
Constructor	Description
`DefaultTrackSelector()`	Deprecated. Use `DefaultTrackSelector(Context)` instead.
`DefaultTrackSelector(Context context)`
`DefaultTrackSelector(Context context, ExoTrackSelection.Factory trackSelectionFactory)`
`DefaultTrackSelector(DefaultTrackSelector.Parameters parameters, ExoTrackSelection.Factory trackSelectionFactory)`
`DefaultTrackSelector(ExoTrackSelection.Factory trackSelectionFactory)`	Deprecated. Use `DefaultTrackSelector(Context, ExoTrackSelection.Factory)`.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`DefaultTrackSelector.ParametersBuilder`	`buildUponParameters()`	Returns a new `DefaultTrackSelector.ParametersBuilder` initialized with the current selection parameters.
`protected static int`	`getFormatLanguageScore(Format format, String language, boolean allowUndeterminedFormatLanguage)`	Returns a score for how well a language specified in a `Format` matches a given language.
`DefaultTrackSelector.Parameters`	`getParameters()`	Returns the current parameters for track selection.
`boolean`	`isSetParametersSupported()`	Returns if this `TrackSelector` supports `TrackSelector.setParameters(TrackSelectionParameters)`.
`protected static boolean`	`isSupported(@com.google.android.exoplayer2.RendererCapabilities.Capabilities int formatSupport, boolean allowExceedsCapabilities)`	Returns true if the `C.FormatSupport` in the given `RendererCapabilities.Capabilities` is `C.FORMAT_HANDLED` or if `allowExceedsCapabilities` is set and the format support is `C.FORMAT_EXCEEDS_CAPABILITIES`.
`protected static String`	`normalizeUndeterminedLanguageToNull(String language)`	Normalizes the input string to null if it does not define a language, or returns it otherwise.
`protected @NullableType ExoTrackSelection.Definition[]`	`selectAllTracks(MappingTrackSelector.MappedTrackInfo mappedTrackInfo, @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports, @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] rendererMixedMimeTypeAdaptationSupports, DefaultTrackSelector.Parameters params)`	Called from `selectTracks(MappedTrackInfo, int[][][], int[], MediaPeriodId, Timeline)` to make a track selection for each renderer, prior to overrides and disabled flags being applied.
`protected Pair<ExoTrackSelection.Definition,Integer>`	`selectAudioTrack(MappingTrackSelector.MappedTrackInfo mappedTrackInfo, @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports, @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] rendererMixedMimeTypeAdaptationSupports, DefaultTrackSelector.Parameters params)`	Called by `selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters)` to create a `ExoTrackSelection.Definition` for an audio track selection.
`protected ExoTrackSelection.Definition`	`selectOtherTrack(int trackType, TrackGroupArray groups, @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][] formatSupport, DefaultTrackSelector.Parameters params)`	Called by `selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters)` to create a `ExoTrackSelection` for a renderer whose type is neither video, audio or text.
`protected Pair<ExoTrackSelection.Definition,Integer>`	`selectTextTrack(MappingTrackSelector.MappedTrackInfo mappedTrackInfo, @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports, DefaultTrackSelector.Parameters params, String selectedAudioLanguage)`	Called by `selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters)` to create a `ExoTrackSelection.Definition` for a text track selection.
`protected Pair<@NullableType RendererConfiguration[],@NullableType ExoTrackSelection[]>`	`selectTracks(MappingTrackSelector.MappedTrackInfo mappedTrackInfo, @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports, @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] rendererMixedMimeTypeAdaptationSupports, MediaSource.MediaPeriodId mediaPeriodId, Timeline timeline)`	Given mapped track information, returns a track selection and configuration for each renderer.
`protected Pair<ExoTrackSelection.Definition,Integer>`	`selectVideoTrack(MappingTrackSelector.MappedTrackInfo mappedTrackInfo, @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports, @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] mixedMimeTypeSupports, DefaultTrackSelector.Parameters params)`	Called by `selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters)` to create a `ExoTrackSelection.Definition` for a video track selection.
`void`	`setParameters(DefaultTrackSelector.ParametersBuilder parametersBuilder)`	Atomically sets the provided parameters for track selection.
`void`	`setParameters(TrackSelectionParameters parameters)`	Called by the player to provide parameters for track selection.

Methods inherited from class com.google.android.exoplayer2.trackselection.MappingTrackSelector
getCurrentMappedTrackInfo, onSelectionActivated, selectTracks

Methods inherited from class com.google.android.exoplayer2.trackselection.TrackSelector
getBandwidthMeter, init, invalidate

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - SELECTION_ELIGIBILITY_NO
```
protected static final int SELECTION_ELIGIBILITY_NO
```
    Track is not eligible for selection.
    
    See Also:
    
    Constant Field Values
  - SELECTION_ELIGIBILITY_FIXED
```
protected static final int SELECTION_ELIGIBILITY_FIXED
```
    Track is eligible for a fixed selection with one track.
    
    See Also:
    
    Constant Field Values
  - SELECTION_ELIGIBILITY_ADAPTIVE
```
protected static final int SELECTION_ELIGIBILITY_ADAPTIVE
```
    Track is eligible for both a fixed selection and as part of an adaptive selection with multiple tracks.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - DefaultTrackSelector
```
@Deprecated
public DefaultTrackSelector()
```
    Deprecated.
    Use DefaultTrackSelector(Context) instead.
  - DefaultTrackSelector
```
@Deprecated
public DefaultTrackSelector(ExoTrackSelection.Factory trackSelectionFactory)
```
    Deprecated.
    Use DefaultTrackSelector(Context, ExoTrackSelection.Factory).
  - DefaultTrackSelector
```
public DefaultTrackSelector(Context context)
```
    Parameters:
    
    context - Any Context.
  - DefaultTrackSelector
```
public DefaultTrackSelector(Context context,
                            ExoTrackSelection.Factory trackSelectionFactory)
```
    Parameters:
    
    context - Any Context.
    
    trackSelectionFactory - A factory for ExoTrackSelections.
  - DefaultTrackSelector
```
public DefaultTrackSelector(DefaultTrackSelector.Parameters parameters,
                            ExoTrackSelection.Factory trackSelectionFactory)
```
    Parameters:
    
    parameters - Initial DefaultTrackSelector.Parameters.
    
    trackSelectionFactory - A factory for ExoTrackSelections.
- Method Detail
  - getParameters
```
public DefaultTrackSelector.Parameters getParameters()
```
    Description copied from class: TrackSelector
    
    Returns the current parameters for track selection.
    
    Overrides:
    
    getParameters in class TrackSelector
  - isSetParametersSupported
```
public boolean isSetParametersSupported()
```
    Description copied from class: TrackSelector
    
    Returns if this TrackSelector supports TrackSelector.setParameters(TrackSelectionParameters).
    The same value is always returned for a given TrackSelector instance.
    
    Overrides:
    
    isSetParametersSupported in class TrackSelector
  - setParameters
```
public void setParameters(TrackSelectionParameters parameters)
```
    Description copied from class: TrackSelector
    
    Called by the player to provide parameters for track selection.
    Only supported if TrackSelector.isSetParametersSupported() returns true.
    
    Overrides:
    
    setParameters in class TrackSelector
    
    Parameters:
    
    parameters - The parameters for track selection.
  - setParameters
```
public void setParameters(DefaultTrackSelector.ParametersBuilder parametersBuilder)
```
    Atomically sets the provided parameters for track selection.
    
    Parameters:
    
    parametersBuilder - A builder from which to obtain the parameters for track selection.
  - buildUponParameters
```
public DefaultTrackSelector.ParametersBuilder buildUponParameters()
```
    Returns a new DefaultTrackSelector.ParametersBuilder initialized with the current selection parameters.
  - selectTracks
```
protected final Pair<@NullableType RendererConfiguration[],@NullableType ExoTrackSelection[]> selectTracks(MappingTrackSelector.MappedTrackInfo mappedTrackInfo,
                                                                                                                 @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports,
                                                                                                                 @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] rendererMixedMimeTypeAdaptationSupports,
                                                                                                                 MediaSource.MediaPeriodId mediaPeriodId,
                                                                                                                 Timeline timeline)
                                                                                                          throws ExoPlaybackException
```
    Description copied from class: MappingTrackSelector
    
    Given mapped track information, returns a track selection and configuration for each renderer.
    
    Specified by:
    
    selectTracks in class MappingTrackSelector
    
    Parameters:
    
    mappedTrackInfo - Mapped track information.
    
    rendererFormatSupports - The RendererCapabilities.Capabilities for ach mapped track, indexed by renderer, track group and track (in that order).
    
    rendererMixedMimeTypeAdaptationSupports - The RendererCapabilities.AdaptiveSupport for mixed MIME type adaptation for the renderer.
    
    mediaPeriodId - The MediaSource.MediaPeriodId of the period for which tracks are to be selected.
    
    timeline - The Timeline holding the period for which tracks are to be selected.
    
    Returns:
    
    A pair consisting of the track selections and configurations for each renderer. A null configuration indicates the renderer should be disabled, in which case the track selection will also be null. A track selection may also be null for a non-disabled renderer if RendererCapabilities.getTrackType() is C.TRACK_TYPE_NONE.
    
    Throws:
    
    ExoPlaybackException - If an error occurs while selecting the tracks.
  - selectAllTracks
```
protected @NullableType ExoTrackSelection.Definition[] selectAllTracks(MappingTrackSelector.MappedTrackInfo mappedTrackInfo,
                                                                       @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports,
                                                                       @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] rendererMixedMimeTypeAdaptationSupports,
                                                                       DefaultTrackSelector.Parameters params)
                                                                throws ExoPlaybackException
```
    Called from selectTracks(MappedTrackInfo, int[][][], int[], MediaPeriodId, Timeline) to make a track selection for each renderer, prior to overrides and disabled flags being applied.
    The implementation should not account for overrides and disabled flags. Track selections generated by this method will be overridden to account for these properties.
    
    Parameters:
    
    mappedTrackInfo - Mapped track information.
    
    rendererFormatSupports - The RendererCapabilities.Capabilities for each mapped track, indexed by renderer, track group and track (in that order).
    
    rendererMixedMimeTypeAdaptationSupports - The RendererCapabilities.AdaptiveSupport for mixed MIME type adaptation for the renderer.
    
    Returns:
    
    The ExoTrackSelection.Definitions for the renderers. A null entry indicates no selection was made.
    
    Throws:
    
    ExoPlaybackException - If an error occurs while selecting the tracks.
  - selectVideoTrack
```
@Nullable
protected Pair<ExoTrackSelection.Definition,Integer> selectVideoTrack(MappingTrackSelector.MappedTrackInfo mappedTrackInfo,
                                                                            @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports,
                                                                            @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] mixedMimeTypeSupports,
                                                                            DefaultTrackSelector.Parameters params)
                                                                     throws ExoPlaybackException
```
    Called by selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters) to create a ExoTrackSelection.Definition for a video track selection.
    
    Parameters:
    
    mappedTrackInfo - Mapped track information.
    
    rendererFormatSupports - The RendererCapabilities.Capabilities for each mapped track, indexed by renderer, track group and track (in that order).
    
    mixedMimeTypeSupports - The RendererCapabilities.AdaptiveSupport for mixed MIME type adaptation for the renderer.
    
    params - The selector's current constraint parameters.
    
    Returns:
    
    A pair of the selected ExoTrackSelection.Definition and the corresponding renderer index, or null if no selection was made.
    
    Throws:
    
    ExoPlaybackException - If an error occurs while selecting the tracks.
  - selectAudioTrack
```
@Nullable
protected Pair<ExoTrackSelection.Definition,Integer> selectAudioTrack(MappingTrackSelector.MappedTrackInfo mappedTrackInfo,
                                                                            @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports,
                                                                            @com.google.android.exoplayer2.RendererCapabilities.AdaptiveSupport int[] rendererMixedMimeTypeAdaptationSupports,
                                                                            DefaultTrackSelector.Parameters params)
                                                                     throws ExoPlaybackException
```
    Called by selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters) to create a ExoTrackSelection.Definition for an audio track selection.
    
    Parameters:
    
    mappedTrackInfo - Mapped track information.
    
    rendererFormatSupports - The RendererCapabilities.Capabilities for each mapped track, indexed by renderer, track group and track (in that order).
    
    rendererMixedMimeTypeAdaptationSupports - The RendererCapabilities.AdaptiveSupport for mixed MIME type adaptation for the renderer.
    
    params - The selector's current constraint parameters.
    
    Returns:
    
    A pair of the selected ExoTrackSelection.Definition and the corresponding renderer index, or null if no selection was made.
    
    Throws:
    
    ExoPlaybackException - If an error occurs while selecting the tracks.
  - selectTextTrack
```
@Nullable
protected Pair<ExoTrackSelection.Definition,Integer> selectTextTrack(MappingTrackSelector.MappedTrackInfo mappedTrackInfo,
                                                                           @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][][] rendererFormatSupports,
                                                                           DefaultTrackSelector.Parameters params,
                                                                           @Nullable
                                                                           String selectedAudioLanguage)
                                                                    throws ExoPlaybackException
```
    Called by selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters) to create a ExoTrackSelection.Definition for a text track selection.
    
    Parameters:
    
    mappedTrackInfo - Mapped track information.
    
    rendererFormatSupports - The RendererCapabilities.Capabilities for each mapped track, indexed by renderer, track group and track (in that order).
    
    params - The selector's current constraint parameters.
    
    selectedAudioLanguage - The language of the selected audio track. May be null if the selected audio track declares no language or no audio track was selected.
    
    Returns:
    
    A pair of the selected ExoTrackSelection.Definition and the corresponding renderer index, or null if no selection was made.
    
    Throws:
    
    ExoPlaybackException - If an error occurs while selecting the tracks.
  - selectOtherTrack
```
@Nullable
protected ExoTrackSelection.Definition selectOtherTrack(int trackType,
                                                        TrackGroupArray groups,
                                                        @com.google.android.exoplayer2.RendererCapabilities.Capabilities int[][] formatSupport,
                                                        DefaultTrackSelector.Parameters params)
                                                 throws ExoPlaybackException
```
    Called by selectAllTracks(MappedTrackInfo, int[][][], int[], Parameters) to create a ExoTrackSelection for a renderer whose type is neither video, audio or text.
    
    Parameters:
    
    trackType - The type of the renderer.
    
    groups - The TrackGroupArray mapped to the renderer.
    
    formatSupport - The RendererCapabilities.Capabilities for each mapped track, indexed by track group and track (in that order).
    
    params - The selector's current constraint parameters.
    
    Returns:
    
    The ExoTrackSelection for the renderer, or null if no selection was made.
    
    Throws:
    
    ExoPlaybackException - If an error occurs while selecting the tracks.
  - isSupported
```
protected static boolean isSupported(@com.google.android.exoplayer2.RendererCapabilities.Capabilities int formatSupport,
                                     boolean allowExceedsCapabilities)
```
    Returns true if the C.FormatSupport in the given RendererCapabilities.Capabilities is C.FORMAT_HANDLED or if allowExceedsCapabilities is set and the format support is C.FORMAT_EXCEEDS_CAPABILITIES.
    
    Parameters:
    
    formatSupport - RendererCapabilities.Capabilities.
    
    allowExceedsCapabilities - Whether to return true if C.FormatSupport is C.FORMAT_EXCEEDS_CAPABILITIES.
    
    Returns:
    
    True if C.FormatSupport is C.FORMAT_HANDLED, or if allowExceedsCapabilities is set and the format support is C.FORMAT_EXCEEDS_CAPABILITIES.
  - normalizeUndeterminedLanguageToNull
```
@Nullable
protected static String normalizeUndeterminedLanguageToNull(@Nullable
                                                            String language)
```
    Normalizes the input string to null if it does not define a language, or returns it otherwise.
    
    Parameters:
    
    language - The string.
    
    Returns:
    
    The string, optionally normalized to null if it does not define a language.
  - getFormatLanguageScore
```
protected static int getFormatLanguageScore(Format format,
                                            @Nullable
                                            String language,
                                            boolean allowUndeterminedFormatLanguage)
```
    Returns a score for how well a language specified in a Format matches a given language.
    
    Parameters:
    
    format - The Format.
    
    language - The language, or null.
    
    allowUndeterminedFormatLanguage - Whether matches with an empty or undetermined format language tag are allowed.
    
    Returns:
    
    A score of 4 if the languages match fully, a score of 3 if the languages match partly, a score of 2 if the languages don't match but belong to the same main language, a score of 1 if the format language is undetermined and such a match is allowed, and a score of 0 if the languages don't match at all.

Class DefaultTrackSelector

Modifying parameters

Nested Class Summary

Nested classes/interfaces inherited from class com.google.android.exoplayer2.trackselection.MappingTrackSelector

Nested classes/interfaces inherited from class com.google.android.exoplayer2.trackselection.TrackSelector

Field Summary

Constructor Summary

Method Summary

Methods inherited from class com.google.android.exoplayer2.trackselection.MappingTrackSelector

Methods inherited from class com.google.android.exoplayer2.trackselection.TrackSelector

Methods inherited from class java.lang.Object

Field Detail

SELECTION_ELIGIBILITY_NO

SELECTION_ELIGIBILITY_FIXED

SELECTION_ELIGIBILITY_ADAPTIVE

Constructor Detail

DefaultTrackSelector

DefaultTrackSelector

DefaultTrackSelector

DefaultTrackSelector

DefaultTrackSelector

Method Detail

getParameters

isSetParametersSupported

setParameters

setParameters

buildUponParameters

selectTracks

selectAllTracks

selectVideoTrack

selectAudioTrack

selectTextTrack

selectOtherTrack

isSupported

normalizeUndeterminedLanguageToNull

getFormatLanguageScore