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<title>AdaptiveTrackSelection (ExoPlayer library)</title>
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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">com.google.android.exoplayer2.trackselection</a></div>
<h2 title="Class AdaptiveTrackSelection" class="title">Class AdaptiveTrackSelection</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">com.google.android.exoplayer2.trackselection.BaseTrackSelection</a></li>
<li>
<ul class="inheritance">
<li>com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection</li>
</ul>
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<dt>All Implemented Interfaces:</dt>
<dd><code><a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></code>, <code><a href="TrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">TrackSelection</a></code></dd>
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<pre>public class <span class="typeNameLabel">AdaptiveTrackSelection</span>
extends <a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></pre>
<div class="block">A bandwidth based adaptive <a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection"><code>ExoTrackSelection</code></a>, whose selected track is updated to be the
one of highest quality given the current network conditions and the state of the buffer.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="AdaptiveTrackSelection.AdaptationCheckpoint.html" title="class in com.google.android.exoplayer2.trackselection">AdaptiveTrackSelection.AdaptationCheckpoint</a></span></code></th>
<td class="colLast">
<div class="block">Checkpoint to determine allocated bandwidth.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="AdaptiveTrackSelection.Factory.html" title="class in com.google.android.exoplayer2.trackselection">AdaptiveTrackSelection.Factory</a></span></code></th>
<td class="colLast">
<div class="block">Factory for <a href="AdaptiveTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection"><code>AdaptiveTrackSelection</code></a> instances.</div>
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<h3>Nested classes/interfaces inherited from interface&nbsp;com.google.android.exoplayer2.trackselection.<a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></h3>
<code><a href="ExoTrackSelection.Definition.html" title="class in com.google.android.exoplayer2.trackselection">ExoTrackSelection.Definition</a></code></li>
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<td class="colFirst"><code>static float</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_BANDWIDTH_FRACTION">DEFAULT_BANDWIDTH_FRACTION</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>static float</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE">DEFAULT_BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS">DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS">DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS">DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS</a></span></code></th>
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<h3>Fields inherited from class&nbsp;com.google.android.exoplayer2.trackselection.<a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></h3>
<code><a href="BaseTrackSelection.html#group">group</a>, <a href="BaseTrackSelection.html#length">length</a>, <a href="BaseTrackSelection.html#tracks">tracks</a></code></li>
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<h3>Fields inherited from interface&nbsp;com.google.android.exoplayer2.trackselection.<a href="TrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">TrackSelection</a></h3>
<code><a href="TrackSelection.html#TYPE_CUSTOM_BASE">TYPE_CUSTOM_BASE</a>, <a href="TrackSelection.html#TYPE_UNSET">TYPE_UNSET</a></code></li>
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<th class="colFirst" scope="col">Modifier</th>
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<td class="colFirst"><code>protected </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(com.google.android.exoplayer2.source.TrackGroup,int%5B%5D,int,com.google.android.exoplayer2.upstream.BandwidthMeter,long,long,long,float,float,java.util.List,com.google.android.exoplayer2.util.Clock)">AdaptiveTrackSelection</a></span>&#8203;(<a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source">TrackGroup</a>&nbsp;group,
int[]&nbsp;tracks,
int&nbsp;type,
<a href="../upstream/BandwidthMeter.html" title="interface in com.google.android.exoplayer2.upstream">BandwidthMeter</a>&nbsp;bandwidthMeter,
long&nbsp;minDurationForQualityIncreaseMs,
long&nbsp;maxDurationForQualityDecreaseMs,
long&nbsp;minDurationToRetainAfterDiscardMs,
float&nbsp;bandwidthFraction,
float&nbsp;bufferedFractionToLiveEdgeForQualityIncrease,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="AdaptiveTrackSelection.AdaptationCheckpoint.html" title="class in com.google.android.exoplayer2.trackselection" target="_top">AdaptiveTrackSelection.AdaptationCheckpoint</a>&gt;&nbsp;adaptationCheckpoints,
<a href="../util/Clock.html" title="interface in com.google.android.exoplayer2.util">Clock</a>&nbsp;clock)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>&nbsp;</code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(com.google.android.exoplayer2.source.TrackGroup,int%5B%5D,com.google.android.exoplayer2.upstream.BandwidthMeter)">AdaptiveTrackSelection</a></span>&#8203;(<a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source">TrackGroup</a>&nbsp;group,
int[]&nbsp;tracks,
<a href="../upstream/BandwidthMeter.html" title="interface in com.google.android.exoplayer2.upstream">BandwidthMeter</a>&nbsp;bandwidthMeter)</code></th>
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<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#canSelectFormat(com.google.android.exoplayer2.Format,int,long)">canSelectFormat</a></span>&#8203;(<a href="../Format.html" title="class in com.google.android.exoplayer2">Format</a>&nbsp;format,
int&nbsp;trackBitrate,
long&nbsp;effectiveBitrate)</code></th>
<td class="colLast">
<div class="block">Called when updating the selected track to determine whether a candidate track can be selected.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#disable()">disable</a></span>()</code></th>
<td class="colLast">
<div class="block">Disables this track selection.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#enable()">enable</a></span>()</code></th>
<td class="colLast">
<div class="block">Enables the track selection.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#evaluateQueueSize(long,java.util.List)">evaluateQueueSize</a></span>&#8203;(long&nbsp;playbackPositionUs,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue)</code></th>
<td class="colLast">
<div class="block">Returns the number of chunks that should be retained in the queue.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>protected long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMinDurationToRetainAfterDiscardUs()">getMinDurationToRetainAfterDiscardUs</a></span>()</code></th>
<td class="colLast">
<div class="block">Called from <a href="#evaluateQueueSize(long,java.util.List)"><code>evaluateQueueSize(long, List)</code></a> to determine the minimum duration of buffer
to retain after discarding chunks.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSelectedIndex()">getSelectedIndex</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the index of the selected track.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSelectionData()">getSelectionData</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns optional data associated with the current track selection.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSelectionReason()">getSelectionReason</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the reason for the current track selection.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onPlaybackSpeed(float)">onPlaybackSpeed</a></span>&#8203;(float&nbsp;playbackSpeed)</code></th>
<td class="colLast">
<div class="block">Called to notify the selection of the current playback speed.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#shouldEvaluateQueueSize(long,java.util.List)">shouldEvaluateQueueSize</a></span>&#8203;(long&nbsp;nowMs,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue)</code></th>
<td class="colLast">
<div class="block">Called from <a href="#evaluateQueueSize(long,java.util.List)"><code>evaluateQueueSize(long, List)</code></a> to determine whether an evaluation should be
performed.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#updateSelectedTrack(long,long,long,java.util.List,com.google.android.exoplayer2.source.chunk.MediaChunkIterator%5B%5D)">updateSelectedTrack</a></span>&#8203;(long&nbsp;playbackPositionUs,
long&nbsp;bufferedDurationUs,
long&nbsp;availableDurationUs,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue,
<a href="../source/chunk/MediaChunkIterator.html" title="interface in com.google.android.exoplayer2.source.chunk">MediaChunkIterator</a>[]&nbsp;mediaChunkIterators)</code></th>
<td class="colLast">
<div class="block">Updates the selected track for sources that load media in discrete <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunk</code></a>s.</div>
</td>
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<h3>Methods inherited from class&nbsp;com.google.android.exoplayer2.trackselection.<a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></h3>
<code><a href="BaseTrackSelection.html#blacklist(int,long)">blacklist</a>, <a href="BaseTrackSelection.html#equals(java.lang.Object)">equals</a>, <a href="BaseTrackSelection.html#getFormat(int)">getFormat</a>, <a href="BaseTrackSelection.html#getIndexInTrackGroup(int)">getIndexInTrackGroup</a>, <a href="BaseTrackSelection.html#getSelectedFormat()">getSelectedFormat</a>, <a href="BaseTrackSelection.html#getSelectedIndexInTrackGroup()">getSelectedIndexInTrackGroup</a>, <a href="BaseTrackSelection.html#getTrackGroup()">getTrackGroup</a>, <a href="BaseTrackSelection.html#getType()">getType</a>, <a href="BaseTrackSelection.html#hashCode()">hashCode</a>, <a href="BaseTrackSelection.html#indexOf(int)">indexOf</a>, <a href="BaseTrackSelection.html#indexOf(com.google.android.exoplayer2.Format)">indexOf</a>, <a href="BaseTrackSelection.html#isBlacklisted(int,long)">isBlacklisted</a>, <a href="BaseTrackSelection.html#length()">length</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></h3>
<code><a href="https://developer.android.com/reference/java/lang/Object.html#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink" target="_top">wait</a></code></li>
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<h3>Methods inherited from interface&nbsp;com.google.android.exoplayer2.trackselection.<a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></h3>
<code><a href="ExoTrackSelection.html#onDiscontinuity()">onDiscontinuity</a>, <a href="ExoTrackSelection.html#onPlayWhenReadyChanged(boolean)">onPlayWhenReadyChanged</a>, <a href="ExoTrackSelection.html#onRebuffer()">onRebuffer</a>, <a href="ExoTrackSelection.html#shouldCancelChunkLoad(long,com.google.android.exoplayer2.source.chunk.Chunk,java.util.List)">shouldCancelChunkLoad</a></code></li>
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<pre>public static final&nbsp;int DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS</pre>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection.DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS">Constant Field Values</a></dd>
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<pre>public static final&nbsp;int DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS</pre>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection.DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS">Constant Field Values</a></dd>
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<pre>public static final&nbsp;int DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS</pre>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection.DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS">Constant Field Values</a></dd>
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<pre>public static final&nbsp;float DEFAULT_BANDWIDTH_FRACTION</pre>
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<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection.DEFAULT_BANDWIDTH_FRACTION">Constant Field Values</a></dd>
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<pre>public static final&nbsp;float DEFAULT_BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection.DEFAULT_BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE">Constant Field Values</a></dd>
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<h3>Constructor Detail</h3>
<a id="&lt;init&gt;(com.google.android.exoplayer2.source.TrackGroup,int[],com.google.android.exoplayer2.upstream.BandwidthMeter)">
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<h4>AdaptiveTrackSelection</h4>
<pre>public&nbsp;AdaptiveTrackSelection&#8203;(<a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source">TrackGroup</a>&nbsp;group,
int[]&nbsp;tracks,
<a href="../upstream/BandwidthMeter.html" title="interface in com.google.android.exoplayer2.upstream">BandwidthMeter</a>&nbsp;bandwidthMeter)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>group</code> - The <a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source"><code>TrackGroup</code></a>.</dd>
<dd><code>tracks</code> - The indices of the selected tracks within the <a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source"><code>TrackGroup</code></a>. Must not be
empty. May be in any order.</dd>
<dd><code>bandwidthMeter</code> - Provides an estimate of the currently available bandwidth.</dd>
</dl>
</li>
</ul>
<a id="&lt;init&gt;(com.google.android.exoplayer2.source.TrackGroup,int[],int,com.google.android.exoplayer2.upstream.BandwidthMeter,long,long,long,float,float,java.util.List,com.google.android.exoplayer2.util.Clock)">
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<h4>AdaptiveTrackSelection</h4>
<pre>protected&nbsp;AdaptiveTrackSelection&#8203;(<a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source">TrackGroup</a>&nbsp;group,
int[]&nbsp;tracks,
int&nbsp;type,
<a href="../upstream/BandwidthMeter.html" title="interface in com.google.android.exoplayer2.upstream">BandwidthMeter</a>&nbsp;bandwidthMeter,
long&nbsp;minDurationForQualityIncreaseMs,
long&nbsp;maxDurationForQualityDecreaseMs,
long&nbsp;minDurationToRetainAfterDiscardMs,
float&nbsp;bandwidthFraction,
float&nbsp;bufferedFractionToLiveEdgeForQualityIncrease,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="AdaptiveTrackSelection.AdaptationCheckpoint.html" title="class in com.google.android.exoplayer2.trackselection" target="_top">AdaptiveTrackSelection.AdaptationCheckpoint</a>&gt;&nbsp;adaptationCheckpoints,
<a href="../util/Clock.html" title="interface in com.google.android.exoplayer2.util">Clock</a>&nbsp;clock)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>group</code> - The <a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source"><code>TrackGroup</code></a>.</dd>
<dd><code>tracks</code> - The indices of the selected tracks within the <a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source"><code>TrackGroup</code></a>. Must not be
empty. May be in any order.</dd>
<dd><code>type</code> - The type that will be returned from <a href="TrackSelection.html#getType()"><code>TrackSelection.getType()</code></a>.</dd>
<dd><code>bandwidthMeter</code> - Provides an estimate of the currently available bandwidth.</dd>
<dd><code>minDurationForQualityIncreaseMs</code> - The minimum duration of buffered data required for the
selected track to switch to one of higher quality.</dd>
<dd><code>maxDurationForQualityDecreaseMs</code> - The maximum duration of buffered data required for the
selected track to switch to one of lower quality.</dd>
<dd><code>minDurationToRetainAfterDiscardMs</code> - When switching to a track of significantly higher
quality, the selection may indicate that media already buffered at the lower quality can be
discarded to speed up the switch. This is the minimum duration of media that must be
retained at the lower quality. It must be at least <code>minDurationForQualityIncreaseMs</code>.</dd>
<dd><code>bandwidthFraction</code> - The fraction of the available bandwidth that the selection should
consider available for use. Setting to a value less than 1 is recommended to account for
inaccuracies in the bandwidth estimator.</dd>
<dd><code>bufferedFractionToLiveEdgeForQualityIncrease</code> - For live streaming, the fraction of the
duration from current playback position to the live edge that has to be buffered before the
selected track can be switched to one of higher quality. This parameter is only applied
when the playback position is closer to the live edge than <code>
minDurationForQualityIncreaseMs</code>, which would otherwise prevent switching to a higher
quality from happening.</dd>
<dd><code>adaptationCheckpoints</code> - The <a href="AdaptiveTrackSelection.AdaptationCheckpoint.html" title="class in com.google.android.exoplayer2.trackselection"><code>checkpoints</code></a> that can be used to
calculate available bandwidth for this selection.</dd>
<dd><code>clock</code> - The <a href="../util/Clock.html" title="interface in com.google.android.exoplayer2.util"><code>Clock</code></a>.</dd>
</dl>
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<h4>enable</h4>
<pre class="methodSignature">@CallSuper
public&nbsp;void&nbsp;enable()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#enable()">ExoTrackSelection</a></code></span></div>
<div class="block">Enables the track selection. Dynamic changes via <a href="ExoTrackSelection.html#updateSelectedTrack(long,long,long,java.util.List,com.google.android.exoplayer2.source.chunk.MediaChunkIterator%5B%5D)"><code>ExoTrackSelection.updateSelectedTrack(long, long, long,
List, MediaChunkIterator[])</code></a>, <a href="ExoTrackSelection.html#evaluateQueueSize(long,java.util.List)"><code>ExoTrackSelection.evaluateQueueSize(long, List)</code></a> or <a href="ExoTrackSelection.html#shouldCancelChunkLoad(long,com.google.android.exoplayer2.source.chunk.Chunk,java.util.List)"><code>ExoTrackSelection.shouldCancelChunkLoad(long, Chunk, List)</code></a> will only happen after this call.
<p>This method may not be called when the track selection is already enabled.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="ExoTrackSelection.html#enable()">enable</a></code>&nbsp;in interface&nbsp;<code><a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="BaseTrackSelection.html#enable()">enable</a></code>&nbsp;in class&nbsp;<code><a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></code></dd>
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<pre class="methodSignature">@CallSuper
public&nbsp;void&nbsp;disable()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#disable()">ExoTrackSelection</a></code></span></div>
<div class="block">Disables this track selection. No further dynamic changes via <a href="ExoTrackSelection.html#updateSelectedTrack(long,long,long,java.util.List,com.google.android.exoplayer2.source.chunk.MediaChunkIterator%5B%5D)"><code>ExoTrackSelection.updateSelectedTrack(long,
long, long, List, MediaChunkIterator[])</code></a>, <a href="ExoTrackSelection.html#evaluateQueueSize(long,java.util.List)"><code>ExoTrackSelection.evaluateQueueSize(long, List)</code></a> or <a href="ExoTrackSelection.html#shouldCancelChunkLoad(long,com.google.android.exoplayer2.source.chunk.Chunk,java.util.List)"><code>ExoTrackSelection.shouldCancelChunkLoad(long, Chunk, List)</code></a> will happen after this call.
<p>This method may only be called when the track selection is already enabled.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="ExoTrackSelection.html#disable()">disable</a></code>&nbsp;in interface&nbsp;<code><a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="BaseTrackSelection.html#disable()">disable</a></code>&nbsp;in class&nbsp;<code><a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></code></dd>
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<pre class="methodSignature">public&nbsp;void&nbsp;onPlaybackSpeed&#8203;(float&nbsp;playbackSpeed)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#onPlaybackSpeed(float)">ExoTrackSelection</a></code></span></div>
<div class="block">Called to notify the selection of the current playback speed. The playback speed may affect
adaptive track selection.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="ExoTrackSelection.html#onPlaybackSpeed(float)">onPlaybackSpeed</a></code>&nbsp;in interface&nbsp;<code><a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="BaseTrackSelection.html#onPlaybackSpeed(float)">onPlaybackSpeed</a></code>&nbsp;in class&nbsp;<code><a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>playbackSpeed</code> - The factor by which playback is sped up.</dd>
</dl>
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<h4>updateSelectedTrack</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;updateSelectedTrack&#8203;(long&nbsp;playbackPositionUs,
long&nbsp;bufferedDurationUs,
long&nbsp;availableDurationUs,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue,
<a href="../source/chunk/MediaChunkIterator.html" title="interface in com.google.android.exoplayer2.source.chunk">MediaChunkIterator</a>[]&nbsp;mediaChunkIterators)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#updateSelectedTrack(long,long,long,java.util.List,com.google.android.exoplayer2.source.chunk.MediaChunkIterator%5B%5D)">ExoTrackSelection</a></code></span></div>
<div class="block">Updates the selected track for sources that load media in discrete <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunk</code></a>s.
<p>This method will only be called when the selection is enabled.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>playbackPositionUs</code> - The current playback position in microseconds. If playback of the
period to which this track selection belongs has not yet started, the value will be the
starting position in the period minus the duration of any media in previous periods still
to be played.</dd>
<dd><code>bufferedDurationUs</code> - The duration of media currently buffered from the current playback
position, in microseconds. Note that the next load position can be calculated as <code>
(playbackPositionUs + bufferedDurationUs)</code>.</dd>
<dd><code>availableDurationUs</code> - The duration of media available for buffering from the current
playback position, in microseconds, or <a href="../C.html#TIME_UNSET"><code>C.TIME_UNSET</code></a> if media can be buffered to the
end of the current period. Note that if not set to <a href="../C.html#TIME_UNSET"><code>C.TIME_UNSET</code></a>, the position up to
which media is available for buffering can be calculated as <code>(playbackPositionUs +
availableDurationUs)</code>.</dd>
<dd><code>queue</code> - The queue of already buffered <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunk</code></a>s. Must not be modified.</dd>
<dd><code>mediaChunkIterators</code> - An array of <a href="../source/chunk/MediaChunkIterator.html" title="interface in com.google.android.exoplayer2.source.chunk"><code>MediaChunkIterator</code></a>s providing information about
the sequence of upcoming media chunks for each track in the selection. All iterators start
from the media chunk which will be loaded next if the respective track is selected. Note
that this information may not be available for all tracks, and so some iterators may be
empty.</dd>
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<pre class="methodSignature">public&nbsp;int&nbsp;getSelectedIndex()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#getSelectedIndex()">ExoTrackSelection</a></code></span></div>
<div class="block">Returns the index of the selected track.</div>
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<pre class="methodSignature">public&nbsp;int&nbsp;getSelectionReason()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#getSelectionReason()">ExoTrackSelection</a></code></span></div>
<div class="block">Returns the reason for the current track selection.</div>
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<pre class="methodSignature">@Nullable
public&nbsp;<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;getSelectionData()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#getSelectionData()">ExoTrackSelection</a></code></span></div>
<div class="block">Returns optional data associated with the current track selection.</div>
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<pre class="methodSignature">public&nbsp;int&nbsp;evaluateQueueSize&#8203;(long&nbsp;playbackPositionUs,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#evaluateQueueSize(long,java.util.List)">ExoTrackSelection</a></code></span></div>
<div class="block">Returns the number of chunks that should be retained in the queue.
<p>May be called by sources that load media in discrete <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunks</code></a> and
support discarding of buffered chunks.
<p>To avoid excessive re-buffering, implementations should normally return the size of the
queue. An example of a case where a smaller value may be returned is if network conditions have
improved dramatically, allowing chunks to be discarded and re-buffered in a track of
significantly higher quality. Discarding chunks may allow faster switching to a higher quality
track in this case.
<p>Note that even if the source supports discarding of buffered chunks, the actual number of
discarded chunks is not guaranteed. The source will call <a href="ExoTrackSelection.html#updateSelectedTrack(long,long,long,java.util.List,com.google.android.exoplayer2.source.chunk.MediaChunkIterator%5B%5D)"><code>ExoTrackSelection.updateSelectedTrack(long,
long, long, List, MediaChunkIterator[])</code></a> with the updated queue of chunks before loading a new
chunk to allow switching to another quality.
<p>This method will only be called when the selection is enabled and none of the <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunks</code></a> in the queue are currently loading.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="ExoTrackSelection.html#evaluateQueueSize(long,java.util.List)">evaluateQueueSize</a></code>&nbsp;in interface&nbsp;<code><a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="BaseTrackSelection.html#evaluateQueueSize(long,java.util.List)">evaluateQueueSize</a></code>&nbsp;in class&nbsp;<code><a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>playbackPositionUs</code> - The current playback position in microseconds. If playback of the
period to which this track selection belongs has not yet started, the value will be the
starting position in the period minus the duration of any media in previous periods still
to be played.</dd>
<dd><code>queue</code> - The queue of buffered <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunks</code></a>. Must not be modified.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The number of chunks to retain in the queue.</dd>
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<pre class="methodSignature">protected&nbsp;boolean&nbsp;canSelectFormat&#8203;(<a href="../Format.html" title="class in com.google.android.exoplayer2">Format</a>&nbsp;format,
int&nbsp;trackBitrate,
long&nbsp;effectiveBitrate)</pre>
<div class="block">Called when updating the selected track to determine whether a candidate track can be selected.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>format</code> - The <a href="../Format.html" title="class in com.google.android.exoplayer2"><code>Format</code></a> of the candidate track.</dd>
<dd><code>trackBitrate</code> - The estimated bitrate of the track. May differ from <a href="../Format.html#bitrate"><code>Format.bitrate</code></a>
if a more accurate estimate of the current track bitrate is available.</dd>
<dd><code>effectiveBitrate</code> - The bitrate available to this selection.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether this <a href="../Format.html" title="class in com.google.android.exoplayer2"><code>Format</code></a> can be selected.</dd>
</dl>
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<h4>shouldEvaluateQueueSize</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;shouldEvaluateQueueSize&#8203;(long&nbsp;nowMs,
<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue)</pre>
<div class="block">Called from <a href="#evaluateQueueSize(long,java.util.List)"><code>evaluateQueueSize(long, List)</code></a> to determine whether an evaluation should be
performed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nowMs</code> - The current value of <a href="../util/Clock.html#elapsedRealtime()"><code>Clock.elapsedRealtime()</code></a>.</dd>
<dd><code>queue</code> - The queue of buffered <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunks</code></a>. Must not be modified.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether an evaluation should be performed.</dd>
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<h4>getMinDurationToRetainAfterDiscardUs</h4>
<pre class="methodSignature">protected&nbsp;long&nbsp;getMinDurationToRetainAfterDiscardUs()</pre>
<div class="block">Called from <a href="#evaluateQueueSize(long,java.util.List)"><code>evaluateQueueSize(long, List)</code></a> to determine the minimum duration of buffer
to retain after discarding chunks.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>The minimum duration of buffer to retain after discarding chunks, in microseconds.</dd>
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