611 lines
31 KiB
HTML
611 lines
31 KiB
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.google.android.exoplayer2</a></div>
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<h2 title="Class DefaultLivePlaybackSpeedControl" class="title">Class DefaultLivePlaybackSpeedControl</h2>
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<div class="contentContainer">
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<ul class="inheritance">
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<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>
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<ul class="inheritance">
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<li>com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl</li>
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<dt>All Implemented Interfaces:</dt>
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<dd><code><a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2">LivePlaybackSpeedControl</a></code></dd>
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</dl>
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<hr>
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<pre>public final class <span class="typeNameLabel">DefaultLivePlaybackSpeedControl</span>
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extends <a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>
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implements <a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2">LivePlaybackSpeedControl</a></pre>
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<div class="block">A <a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2"><code>LivePlaybackSpeedControl</code></a> that adjusts the playback speed using a proportional
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controller.
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<p>The control mechanism calculates the adjusted speed as <code>1.0 + proportionalControlFactor
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x (currentLiveOffsetSec - targetLiveOffsetSec)</code>. Unit speed (1.0f) is used, if the <code>
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currentLiveOffsetSec</code> is closer to <code>targetLiveOffsetSec</code> than the value set with <a href="DefaultLivePlaybackSpeedControl.Builder.html#setMaxLiveOffsetErrorMsForUnitSpeed(long)"><code>DefaultLivePlaybackSpeedControl.Builder.setMaxLiveOffsetErrorMsForUnitSpeed(long)</code></a>.
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<p>The resulting speed is clamped to a minimum and maximum speed defined by the media, the
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fallback values set with <a href="DefaultLivePlaybackSpeedControl.Builder.html#setFallbackMinPlaybackSpeed(float)"><code>DefaultLivePlaybackSpeedControl.Builder.setFallbackMinPlaybackSpeed(float)</code></a> and <a href="DefaultLivePlaybackSpeedControl.Builder.html#setFallbackMaxPlaybackSpeed(float)"><code>DefaultLivePlaybackSpeedControl.Builder.setFallbackMaxPlaybackSpeed(float)</code></a> or the <a href="#DEFAULT_FALLBACK_MIN_PLAYBACK_SPEED"><code>minimum</code></a> and <a href="#DEFAULT_FALLBACK_MAX_PLAYBACK_SPEED"><code>maximum</code></a> fallback default values.
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<p>When the player rebuffers, the target live offset <a href="DefaultLivePlaybackSpeedControl.Builder.html#setTargetLiveOffsetIncrementOnRebufferMs(long)"><code>is increased</code></a> to adjust to the reduced
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network capabilities. The live playback speed control also <a href="DefaultLivePlaybackSpeedControl.Builder.html#setMinPossibleLiveOffsetSmoothingFactor(float)"><code>keeps track</code></a> of the minimum possible live
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offset to decrease the target live offset again if conditions improve. The minimum possible live
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offset is derived from the current offset and the duration of buffered media.</div>
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<h3>Nested Class Summary</h3>
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<table class="memberSummary">
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<caption><span>Nested Classes</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Class</th>
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<th class="colLast" scope="col">Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static class </code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="DefaultLivePlaybackSpeedControl.Builder.html" title="class in com.google.android.exoplayer2">DefaultLivePlaybackSpeedControl.Builder</a></span></code></th>
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<td class="colLast">
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<div class="block">Builder for a <a href="DefaultLivePlaybackSpeedControl.html" title="class in com.google.android.exoplayer2"><code>DefaultLivePlaybackSpeedControl</code></a>.</div>
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</td>
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</tr>
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</table>
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</li>
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</ul>
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</section>
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<!-- =========== FIELD SUMMARY =========== -->
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</a>
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<h3>Field Summary</h3>
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<table class="memberSummary">
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Field</th>
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<th class="colLast" scope="col">Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static float</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_FALLBACK_MAX_PLAYBACK_SPEED">DEFAULT_FALLBACK_MAX_PLAYBACK_SPEED</a></span></code></th>
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<td class="colLast">
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<div class="block">The default maximum factor by which playback can be sped up that should be used if no maximum
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playback speed is defined by the media.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static float</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_FALLBACK_MIN_PLAYBACK_SPEED">DEFAULT_FALLBACK_MIN_PLAYBACK_SPEED</a></span></code></th>
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<td class="colLast">
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<div class="block">The default minimum factor by which playback can be sped up that should be used if no minimum
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playback speed is defined by the media.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_MAX_LIVE_OFFSET_ERROR_MS_FOR_UNIT_SPEED">DEFAULT_MAX_LIVE_OFFSET_ERROR_MS_FOR_UNIT_SPEED</a></span></code></th>
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<td class="colLast">
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<div class="block">The default maximum difference between the current live offset and the target live offset, in
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milliseconds, for which unit speed (1.0f) is used.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static float</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_MIN_POSSIBLE_LIVE_OFFSET_SMOOTHING_FACTOR">DEFAULT_MIN_POSSIBLE_LIVE_OFFSET_SMOOTHING_FACTOR</a></span></code></th>
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<td class="colLast">
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<div class="block">The default smoothing factor when smoothing the minimum possible live offset that can be
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achieved during playback.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_MIN_UPDATE_INTERVAL_MS">DEFAULT_MIN_UPDATE_INTERVAL_MS</a></span></code></th>
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<td class="colLast">
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<div class="block">The default <a href="DefaultLivePlaybackSpeedControl.Builder.html#setMinUpdateIntervalMs(long)"><code>minimum interval</code></a> between playback
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speed changes, in milliseconds.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static float</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_PROPORTIONAL_CONTROL_FACTOR">DEFAULT_PROPORTIONAL_CONTROL_FACTOR</a></span></code></th>
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<td class="colLast">
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<div class="block">The default <a href="DefaultLivePlaybackSpeedControl.Builder.html#setProportionalControlFactor(float)"><code>proportional control factor</code></a>
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used to adjust the playback speed.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_TARGET_LIVE_OFFSET_INCREMENT_ON_REBUFFER_MS">DEFAULT_TARGET_LIVE_OFFSET_INCREMENT_ON_REBUFFER_MS</a></span></code></th>
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<td class="colLast">
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<div class="block">The default increment applied to the target live offset each time the player is rebuffering, in
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milliseconds</div>
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</td>
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</tr>
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</table>
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</li>
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</ul>
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</section>
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<!-- ========== METHOD SUMMARY =========== -->
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<h3>Method Summary</h3>
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<table class="memberSummary">
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Method</th>
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<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>float</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getAdjustedPlaybackSpeed(long,long)">getAdjustedPlaybackSpeed</a></span>​(long liveOffsetUs,
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long bufferedDurationUs)</code></th>
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<td class="colLast">
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<div class="block">Returns the adjusted playback speed in order get closer towards the <a href="LivePlaybackSpeedControl.html#getTargetLiveOffsetUs()"><code>target live offset</code></a>.</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTargetLiveOffsetUs()">getTargetLiveOffsetUs</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Returns the current target live offset, in microseconds, or <a href="C.html#TIME_UNSET"><code>C.TIME_UNSET</code></a> if no target
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live offset is defined for the current media.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#notifyRebuffer()">notifyRebuffer</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Notifies the live playback speed control that a rebuffer occurred.</div>
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</td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)">setLiveConfiguration</a></span>​(<a href="MediaItem.LiveConfiguration.html" title="class in com.google.android.exoplayer2">MediaItem.LiveConfiguration</a> liveConfiguration)</code></th>
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<td class="colLast">
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<div class="block">Sets the live configuration defined by the media.</div>
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</td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setTargetLiveOffsetOverrideUs(long)">setTargetLiveOffsetOverrideUs</a></span>​(long liveOffsetUs)</code></th>
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<td class="colLast">
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<div class="block">Sets the target live offset in microseconds that overrides the live offset <a href="LivePlaybackSpeedControl.html#setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)"><code>configured</code></a> by the media.</div>
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<h3>Methods inherited from class 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>
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<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#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</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#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</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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</ul>
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</li>
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</ul>
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</section>
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</li>
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<!-- ============ FIELD DETAIL =========== -->
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<h3>Field Detail</h3>
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<a id="DEFAULT_FALLBACK_MIN_PLAYBACK_SPEED">
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<h4>DEFAULT_FALLBACK_MIN_PLAYBACK_SPEED</h4>
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<pre>public static final float DEFAULT_FALLBACK_MIN_PLAYBACK_SPEED</pre>
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<div class="block">The default minimum factor by which playback can be sped up that should be used if no minimum
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playback speed is defined by the media.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl.DEFAULT_FALLBACK_MIN_PLAYBACK_SPEED">Constant Field Values</a></dd>
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<pre>public static final float DEFAULT_FALLBACK_MAX_PLAYBACK_SPEED</pre>
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<div class="block">The default maximum factor by which playback can be sped up that should be used if no maximum
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playback speed is defined by the media.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl.DEFAULT_FALLBACK_MAX_PLAYBACK_SPEED">Constant Field Values</a></dd>
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<h4>DEFAULT_MIN_UPDATE_INTERVAL_MS</h4>
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<pre>public static final long DEFAULT_MIN_UPDATE_INTERVAL_MS</pre>
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<div class="block">The default <a href="DefaultLivePlaybackSpeedControl.Builder.html#setMinUpdateIntervalMs(long)"><code>minimum interval</code></a> between playback
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speed changes, in milliseconds.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl.DEFAULT_MIN_UPDATE_INTERVAL_MS">Constant Field Values</a></dd>
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<pre>public static final float DEFAULT_PROPORTIONAL_CONTROL_FACTOR</pre>
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<div class="block">The default <a href="DefaultLivePlaybackSpeedControl.Builder.html#setProportionalControlFactor(float)"><code>proportional control factor</code></a>
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used to adjust the playback speed.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl.DEFAULT_PROPORTIONAL_CONTROL_FACTOR">Constant Field Values</a></dd>
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<pre>public static final long DEFAULT_TARGET_LIVE_OFFSET_INCREMENT_ON_REBUFFER_MS</pre>
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<div class="block">The default increment applied to the target live offset each time the player is rebuffering, in
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milliseconds</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl.DEFAULT_TARGET_LIVE_OFFSET_INCREMENT_ON_REBUFFER_MS">Constant Field Values</a></dd>
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<pre>public static final float DEFAULT_MIN_POSSIBLE_LIVE_OFFSET_SMOOTHING_FACTOR</pre>
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<div class="block">The default smoothing factor when smoothing the minimum possible live offset that can be
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achieved during playback.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl.DEFAULT_MIN_POSSIBLE_LIVE_OFFSET_SMOOTHING_FACTOR">Constant Field Values</a></dd>
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<h4>DEFAULT_MAX_LIVE_OFFSET_ERROR_MS_FOR_UNIT_SPEED</h4>
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<pre>public static final long DEFAULT_MAX_LIVE_OFFSET_ERROR_MS_FOR_UNIT_SPEED</pre>
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<div class="block">The default maximum difference between the current live offset and the target live offset, in
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milliseconds, for which unit speed (1.0f) is used.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#com.google.android.exoplayer2.DefaultLivePlaybackSpeedControl.DEFAULT_MAX_LIVE_OFFSET_ERROR_MS_FOR_UNIT_SPEED">Constant Field Values</a></dd>
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</section>
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<!-- ============ METHOD DETAIL ========== -->
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<h3>Method Detail</h3>
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<a id="setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)">
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<h4>setLiveConfiguration</h4>
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<pre class="methodSignature">public void setLiveConfiguration​(<a href="MediaItem.LiveConfiguration.html" title="class in com.google.android.exoplayer2">MediaItem.LiveConfiguration</a> liveConfiguration)</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="LivePlaybackSpeedControl.html#setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)">LivePlaybackSpeedControl</a></code></span></div>
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<div class="block">Sets the live configuration defined by the media.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="LivePlaybackSpeedControl.html#setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)">setLiveConfiguration</a></code> in interface <code><a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2">LivePlaybackSpeedControl</a></code></dd>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>liveConfiguration</code> - The <a href="MediaItem.LiveConfiguration.html" title="class in com.google.android.exoplayer2"><code>MediaItem.LiveConfiguration</code></a> as defined by the media.</dd>
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<h4>setTargetLiveOffsetOverrideUs</h4>
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<pre class="methodSignature">public void setTargetLiveOffsetOverrideUs​(long liveOffsetUs)</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="LivePlaybackSpeedControl.html#setTargetLiveOffsetOverrideUs(long)">LivePlaybackSpeedControl</a></code></span></div>
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<div class="block">Sets the target live offset in microseconds that overrides the live offset <a href="LivePlaybackSpeedControl.html#setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)"><code>configured</code></a> by the media. Passing <code>C.TIME_UNSET</code> deletes a previous
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override.
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<p>If no target live offset is configured by <a href="LivePlaybackSpeedControl.html#setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)"><code>LivePlaybackSpeedControl.setLiveConfiguration(com.google.android.exoplayer2.MediaItem.LiveConfiguration)</code></a>, this override has
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no effect.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="LivePlaybackSpeedControl.html#setTargetLiveOffsetOverrideUs(long)">setTargetLiveOffsetOverrideUs</a></code> in interface <code><a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2">LivePlaybackSpeedControl</a></code></dd>
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<h4>notifyRebuffer</h4>
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<pre class="methodSignature">public void notifyRebuffer()</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="LivePlaybackSpeedControl.html#notifyRebuffer()">LivePlaybackSpeedControl</a></code></span></div>
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<div class="block">Notifies the live playback speed control that a rebuffer occurred.
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<p>A rebuffer is defined to be caused by buffer depletion rather than a user action. Hence this
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method is not called during initial buffering or when buffering as a result of a seek
|
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operation.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="LivePlaybackSpeedControl.html#notifyRebuffer()">notifyRebuffer</a></code> in interface <code><a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2">LivePlaybackSpeedControl</a></code></dd>
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</dl>
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</li>
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</ul>
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<a id="getAdjustedPlaybackSpeed(long,long)">
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<h4>getAdjustedPlaybackSpeed</h4>
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<pre class="methodSignature">public float getAdjustedPlaybackSpeed​(long liveOffsetUs,
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long bufferedDurationUs)</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="LivePlaybackSpeedControl.html#getAdjustedPlaybackSpeed(long,long)">LivePlaybackSpeedControl</a></code></span></div>
|
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<div class="block">Returns the adjusted playback speed in order get closer towards the <a href="LivePlaybackSpeedControl.html#getTargetLiveOffsetUs()"><code>target live offset</code></a>.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="LivePlaybackSpeedControl.html#getAdjustedPlaybackSpeed(long,long)">getAdjustedPlaybackSpeed</a></code> in interface <code><a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2">LivePlaybackSpeedControl</a></code></dd>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>liveOffsetUs</code> - The current live offset, in microseconds.</dd>
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<dd><code>bufferedDurationUs</code> - The duration of media that's currently buffered, in microseconds.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The adjusted factor by which playback should be sped up.</dd>
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</dl>
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</li>
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</ul>
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<a id="getTargetLiveOffsetUs()">
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<h4>getTargetLiveOffsetUs</h4>
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<pre class="methodSignature">public long getTargetLiveOffsetUs()</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="LivePlaybackSpeedControl.html#getTargetLiveOffsetUs()">LivePlaybackSpeedControl</a></code></span></div>
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<div class="block">Returns the current target live offset, in microseconds, or <a href="C.html#TIME_UNSET"><code>C.TIME_UNSET</code></a> if no target
|
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live offset is defined for the current media.</div>
|
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="LivePlaybackSpeedControl.html#getTargetLiveOffsetUs()">getTargetLiveOffsetUs</a></code> in interface <code><a href="LivePlaybackSpeedControl.html" title="interface in com.google.android.exoplayer2">LivePlaybackSpeedControl</a></code></dd>
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</dl>
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</li>
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