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media/docs/doc/reference-v1/com/google/android/exoplayer/audio/AudioTrack.html
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<div class="subTitle">com.google.android.exoplayer.audio</div>
<h2 title="Class AudioTrack" class="title">Class AudioTrack</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li>com.google.android.exoplayer.audio.AudioTrack</li>
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<pre>public final class <span class="typeNameLabel">AudioTrack</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Plays audio data. The implementation delegates to an <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true" title="class or interface in android.media"><code>AudioTrack</code></a> and handles
playback position smoothing, non-blocking writes and reconfiguration.
<p>
Before starting playback, specify the input audio format by calling one of the <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-"><code>configure(java.lang.String, int, int, int)</code></a>
methods and <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--"><code>initialize()</code></a> the instance, optionally specifying an audio session.
<p>
Call <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(ByteBuffer, int, int, long)</code></a> to write data to play back, and
<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleDiscontinuity--"><code>handleDiscontinuity()</code></a> when a buffer is skipped. Call <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#play--"><code>play()</code></a> to start playing
back written data.
<p>
Call <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-"><code>configure(java.lang.String, int, int, int)</code></a> again whenever the input format changes. If <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#isInitialized--"><code>isInitialized()</code></a>
returns false after calling <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-"><code>configure(java.lang.String, int, int, int)</code></a>, it is necessary to re-<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--"><code>initialize()</code></a> the
instance before writing more data.
<p>
The underlying framework audio track is created by <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--"><code>initialize()</code></a> and released
asynchronously by <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#reset--"><code>reset()</code></a> (and <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-"><code>configure(java.lang.String, int, int, int)</code></a>, unless the format is unchanged).
Reinitialization blocks until releasing the old audio track completes. It is safe to
re-<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--"><code>initialize()</code></a> the instance after calling <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#reset--"><code>reset()</code></a>, without reconfiguration.
<p>
Call <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#release--"><code>release()</code></a> when the instance will no longer be used.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InitializationException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.InitializationException</a></span></code>
<div class="block">Thrown when a failure occurs instantiating an <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true" title="class or interface in android.media"><code>AudioTrack</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InvalidAudioTrackTimestampException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.InvalidAudioTrackTimestampException</a></span></code>
<div class="block">Thrown when <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true#getTimestamp-android.media.AudioTimestamp-" title="class or interface in android.media"><code>AudioTrack.getTimestamp(android.media.AudioTimestamp)</code></a> returns a spurious timestamp, if
<code>AudioTrack#failOnSpuriousAudioTimestamp</code> is set.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.WriteException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.WriteException</a></span></code>
<div class="block">Thrown when a failure occurs writing to an <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true" title="class or interface in android.media"><code>AudioTrack</code></a>.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#CURRENT_POSITION_NOT_SET">CURRENT_POSITION_NOT_SET</a></span></code>
<div class="block">Returned by <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#getCurrentPositionUs-boolean-"><code>getCurrentPositionUs(boolean)</code></a> when the position is not set.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#enablePreV21AudioSessionWorkaround">enablePreV21AudioSessionWorkaround</a></span></code>
<div class="block">Whether to enable a workaround for an issue where an audio effect does not keep its session
active across releasing/initializing a new audio track, on platform API version &lt; 21.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#failOnSpuriousAudioTimestamp">failOnSpuriousAudioTimestamp</a></span></code>
<div class="block">Whether to throw an <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InvalidAudioTrackTimestampException.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack.InvalidAudioTrackTimestampException</code></a> when a spurious timestamp is
reported from <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true#getTimestamp-android.media.AudioTimestamp-" title="class or interface in android.media"><code>AudioTrack.getTimestamp(android.media.AudioTimestamp)</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#RESULT_BUFFER_CONSUMED">RESULT_BUFFER_CONSUMED</a></span></code>
<div class="block">Returned in the result of <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a> if the buffer can be released.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#RESULT_POSITION_DISCONTINUITY">RESULT_POSITION_DISCONTINUITY</a></span></code>
<div class="block">Returned in the result of <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a> if the buffer was discontinuous.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#SESSION_ID_NOT_SET">SESSION_ID_NOT_SET</a></span></code>
<div class="block">Represents an unset <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true" title="class or interface in android.media"><code>AudioTrack</code></a> session identifier.</div>
</td>
</tr>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#AudioTrack--">AudioTrack</a></span>()</code>
<div class="block">Creates an audio track with default audio capabilities (no encoded audio passthrough support).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#AudioTrack-com.google.android.exoplayer.audio.AudioCapabilities-int-">AudioTrack</a></span>(<a href="../../../../../com/google/android/exoplayer/audio/AudioCapabilities.html" title="class in com.google.android.exoplayer.audio">AudioCapabilities</a>&nbsp;audioCapabilities,
int&nbsp;streamType)</code>
<div class="block">Creates an audio track using the specified audio capabilities and stream type.</div>
</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-">configure</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;mimeType,
int&nbsp;channelCount,
int&nbsp;sampleRate,
int&nbsp;pcmEncoding)</code>
<div class="block">Configures (or reconfigures) the audio track, inferring a suitable buffer size automatically.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-int-">configure</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;mimeType,
int&nbsp;channelCount,
int&nbsp;sampleRate,
int&nbsp;pcmEncoding,
int&nbsp;specifiedBufferSize)</code>
<div class="block">Configures (or reconfigures) the audio track.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#getBufferSize--">getBufferSize</a></span>()</code>
<div class="block">Returns the size of this <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>'s buffer in bytes.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#getBufferSizeUs--">getBufferSizeUs</a></span>()</code>
<div class="block">Returns the size of the buffer in microseconds for PCM <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>s, or
<a href="../../../../../com/google/android/exoplayer/C.html#UNKNOWN_TIME_US"><code>C.UNKNOWN_TIME_US</code></a> for passthrough <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>s.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#getCurrentPositionUs-boolean-">getCurrentPositionUs</a></span>(boolean&nbsp;sourceEnded)</code>
<div class="block">Returns the playback position in the stream starting at zero, in microseconds, or
<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#CURRENT_POSITION_NOT_SET"><code>CURRENT_POSITION_NOT_SET</code></a> if it is not yet available.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-">handleBuffer</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;buffer,
int&nbsp;offset,
int&nbsp;size,
long&nbsp;presentationTimeUs)</code>
<div class="block">Attempts to write <code>size</code> bytes from <code>buffer</code> at <code>offset</code> to the audio track.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleDiscontinuity--">handleDiscontinuity</a></span>()</code>
<div class="block">Signals to the audio track that the next buffer is discontinuous with the previous buffer.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleEndOfStream--">handleEndOfStream</a></span>()</code>
<div class="block">Ensures that the last data passed to <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(ByteBuffer, int, int, long)</code></a> is
played out in full.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#hasPendingData--">hasPendingData</a></span>()</code>
<div class="block">Returns whether the audio track has more data pending that will be played back.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--">initialize</a></span>()</code>
<div class="block">Initializes the audio track for writing new buffers using <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a>.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize-int-">initialize</a></span>(int&nbsp;sessionId)</code>
<div class="block">Initializes the audio track for writing new buffers using <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a>.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#isInitialized--">isInitialized</a></span>()</code>
<div class="block">Returns whether the audio track has been successfully initialized via <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--"><code>initialize()</code></a> and
not yet <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#reset--"><code>reset()</code></a>.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#isPassthroughSupported-java.lang.String-">isPassthroughSupported</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;mimeType)</code>
<div class="block">Returns whether it is possible to play back input audio in the specified format using encoded
audio passthrough.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#pause--">pause</a></span>()</code>
<div class="block">Pauses playback.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#play--">play</a></span>()</code>
<div class="block">Starts or resumes playing audio if the audio track has been initialized.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#release--">release</a></span>()</code>
<div class="block">Releases all resources associated with this instance.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#reset--">reset</a></span>()</code>
<div class="block">Releases the underlying audio track asynchronously.</div>
</td>
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<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#setPlaybackParams-android.media.PlaybackParams-">setPlaybackParams</a></span>(<a href="https://developer.android.com/reference/android/media/PlaybackParams.html?is-external=true" title="class or interface in android.media">PlaybackParams</a>&nbsp;playbackParams)</code>
<div class="block">Sets the playback parameters.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#setStreamType-int-">setStreamType</a></span>(int&nbsp;streamType)</code>
<div class="block">Sets the stream type for audio track.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#setVolume-float-">setVolume</a></span>(float&nbsp;volume)</code>
<div class="block">Sets the playback volume.</div>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>public static final&nbsp;int RESULT_POSITION_DISCONTINUITY</pre>
<div class="block">Returned in the result of <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a> if the buffer was discontinuous.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer.audio.AudioTrack.RESULT_POSITION_DISCONTINUITY">Constant Field Values</a></dd>
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<pre>public static final&nbsp;int RESULT_BUFFER_CONSUMED</pre>
<div class="block">Returned in the result of <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a> if the buffer can be released.</div>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer.audio.AudioTrack.RESULT_BUFFER_CONSUMED">Constant Field Values</a></dd>
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<pre>public static final&nbsp;int SESSION_ID_NOT_SET</pre>
<div class="block">Represents an unset <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true" title="class or interface in android.media"><code>AudioTrack</code></a> session identifier.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer.audio.AudioTrack.SESSION_ID_NOT_SET">Constant Field Values</a></dd>
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<pre>public static final&nbsp;long CURRENT_POSITION_NOT_SET</pre>
<div class="block">Returned by <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#getCurrentPositionUs-boolean-"><code>getCurrentPositionUs(boolean)</code></a> when the position is not set.</div>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer.audio.AudioTrack.CURRENT_POSITION_NOT_SET">Constant Field Values</a></dd>
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<pre>public static&nbsp;boolean enablePreV21AudioSessionWorkaround</pre>
<div class="block">Whether to enable a workaround for an issue where an audio effect does not keep its session
active across releasing/initializing a new audio track, on platform API version &lt; 21.
<p>
The flag must be set before creating a player.</div>
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<pre>public static&nbsp;boolean failOnSpuriousAudioTimestamp</pre>
<div class="block">Whether to throw an <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InvalidAudioTrackTimestampException.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack.InvalidAudioTrackTimestampException</code></a> when a spurious timestamp is
reported from <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true#getTimestamp-android.media.AudioTimestamp-" title="class or interface in android.media"><code>AudioTrack.getTimestamp(android.media.AudioTimestamp)</code></a>.
<p>
The flag must be set before creating a player. Should be set to <code>true</code> for testing and
debugging purposes only.</div>
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<pre>public&nbsp;AudioTrack()</pre>
<div class="block">Creates an audio track with default audio capabilities (no encoded audio passthrough support).</div>
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<pre>public&nbsp;AudioTrack(<a href="../../../../../com/google/android/exoplayer/audio/AudioCapabilities.html" title="class in com.google.android.exoplayer.audio">AudioCapabilities</a>&nbsp;audioCapabilities,
int&nbsp;streamType)</pre>
<div class="block">Creates an audio track using the specified audio capabilities and stream type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>audioCapabilities</code> - The current audio playback capabilities.</dd>
<dd><code>streamType</code> - The type of audio stream for the underlying <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true" title="class or interface in android.media"><code>AudioTrack</code></a>.</dd>
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<pre>public&nbsp;boolean&nbsp;isPassthroughSupported(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;mimeType)</pre>
<div class="block">Returns whether it is possible to play back input audio in the specified format using encoded
audio passthrough.</div>
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<pre>public&nbsp;boolean&nbsp;isInitialized()</pre>
<div class="block">Returns whether the audio track has been successfully initialized via <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--"><code>initialize()</code></a> and
not yet <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#reset--"><code>reset()</code></a>.</div>
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<pre>public&nbsp;long&nbsp;getCurrentPositionUs(boolean&nbsp;sourceEnded)</pre>
<div class="block">Returns the playback position in the stream starting at zero, in microseconds, or
<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#CURRENT_POSITION_NOT_SET"><code>CURRENT_POSITION_NOT_SET</code></a> if it is not yet available.
<p>If the device supports it, the method uses the playback timestamp from
<a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true#getTimestamp-android.media.AudioTimestamp-" title="class or interface in android.media"><code>AudioTrack.getTimestamp(android.media.AudioTimestamp)</code></a>. Otherwise, it derives a smoothed position by
sampling the <a href="https://developer.android.com/reference/android/media/AudioTrack.html?is-external=true" title="class or interface in android.media"><code>AudioTrack</code></a>'s frame position.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sourceEnded</code> - Specify <code>true</code> if no more input buffers will be provided.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The playback position relative to the start of playback, in microseconds.</dd>
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<pre>public&nbsp;void&nbsp;configure(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;mimeType,
int&nbsp;channelCount,
int&nbsp;sampleRate,
int&nbsp;pcmEncoding)</pre>
<div class="block">Configures (or reconfigures) the audio track, inferring a suitable buffer size automatically.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mimeType</code> - The mime type.</dd>
<dd><code>channelCount</code> - The number of channels.</dd>
<dd><code>sampleRate</code> - The sample rate in Hz.</dd>
<dd><code>pcmEncoding</code> - For PCM formats, the encoding used. One of <a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_16BIT"><code>C.ENCODING_PCM_16BIT</code></a>,
<a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_16BIT"><code>C.ENCODING_PCM_16BIT</code></a>, <a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_24BIT"><code>C.ENCODING_PCM_24BIT</code></a> and
<a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_32BIT"><code>C.ENCODING_PCM_32BIT</code></a>.</dd>
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<pre>public&nbsp;void&nbsp;configure(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;mimeType,
int&nbsp;channelCount,
int&nbsp;sampleRate,
int&nbsp;pcmEncoding,
int&nbsp;specifiedBufferSize)</pre>
<div class="block">Configures (or reconfigures) the audio track.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mimeType</code> - The mime type.</dd>
<dd><code>channelCount</code> - The number of channels.</dd>
<dd><code>sampleRate</code> - The sample rate in Hz.</dd>
<dd><code>pcmEncoding</code> - For PCM formats, the encoding used. One of <a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_16BIT"><code>C.ENCODING_PCM_16BIT</code></a>,
<a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_16BIT"><code>C.ENCODING_PCM_16BIT</code></a>, <a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_24BIT"><code>C.ENCODING_PCM_24BIT</code></a> and
<a href="../../../../../com/google/android/exoplayer/C.html#ENCODING_PCM_32BIT"><code>C.ENCODING_PCM_32BIT</code></a>.</dd>
<dd><code>specifiedBufferSize</code> - A specific size for the playback buffer in bytes, or 0 to infer a
suitable buffer size automatically.</dd>
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<pre>public&nbsp;int&nbsp;initialize()
throws <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InitializationException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.InitializationException</a></pre>
<div class="block">Initializes the audio track for writing new buffers using <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The audio track session identifier.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InitializationException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.InitializationException</a></code></dd>
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<pre>public&nbsp;int&nbsp;initialize(int&nbsp;sessionId)
throws <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InitializationException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.InitializationException</a></pre>
<div class="block">Initializes the audio track for writing new buffers using <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(java.nio.ByteBuffer, int, int, long)</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sessionId</code> - Audio track session identifier to re-use, or <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#SESSION_ID_NOT_SET"><code>SESSION_ID_NOT_SET</code></a> to
create a new one.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The new (or re-used) session identifier.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.InitializationException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.InitializationException</a></code></dd>
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<pre>public&nbsp;int&nbsp;getBufferSize()</pre>
<div class="block">Returns the size of this <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>'s buffer in bytes.
<p>
The value returned from this method may change as a result of calling one of the
<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-"><code>configure(java.lang.String, int, int, int)</code></a> methods.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The size of the buffer in bytes.</dd>
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<pre>public&nbsp;long&nbsp;getBufferSizeUs()</pre>
<div class="block">Returns the size of the buffer in microseconds for PCM <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>s, or
<a href="../../../../../com/google/android/exoplayer/C.html#UNKNOWN_TIME_US"><code>C.UNKNOWN_TIME_US</code></a> for passthrough <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>s.
<p>
The value returned from this method may change as a result of calling one of the
<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#configure-java.lang.String-int-int-int-"><code>configure(java.lang.String, int, int, int)</code></a> methods.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The size of the buffer in microseconds for PCM <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>s, or
<a href="../../../../../com/google/android/exoplayer/C.html#UNKNOWN_TIME_US"><code>C.UNKNOWN_TIME_US</code></a> for passthrough <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html" title="class in com.google.android.exoplayer.audio"><code>AudioTrack</code></a>s.</dd>
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<pre>public&nbsp;void&nbsp;play()</pre>
<div class="block">Starts or resumes playing audio if the audio track has been initialized.</div>
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<pre>public&nbsp;void&nbsp;handleDiscontinuity()</pre>
<div class="block">Signals to the audio track that the next buffer is discontinuous with the previous buffer.</div>
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<pre>public&nbsp;int&nbsp;handleBuffer(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;buffer,
int&nbsp;offset,
int&nbsp;size,
long&nbsp;presentationTimeUs)
throws <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.WriteException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.WriteException</a></pre>
<div class="block">Attempts to write <code>size</code> bytes from <code>buffer</code> at <code>offset</code> to the audio track.
Returns a bit field containing <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#RESULT_BUFFER_CONSUMED"><code>RESULT_BUFFER_CONSUMED</code></a> if the buffer can be released
(due to having been written), and <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#RESULT_POSITION_DISCONTINUITY"><code>RESULT_POSITION_DISCONTINUITY</code></a> if the buffer was
discontinuous with previously written data.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>buffer</code> - The buffer containing audio data to play back.</dd>
<dd><code>offset</code> - The offset in the buffer from which to consume data.</dd>
<dd><code>size</code> - The number of bytes to consume from <code>buffer</code>.</dd>
<dd><code>presentationTimeUs</code> - Presentation timestamp of the next buffer in microseconds.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A bit field with <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#RESULT_BUFFER_CONSUMED"><code>RESULT_BUFFER_CONSUMED</code></a> if the buffer can be released, and
<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#RESULT_POSITION_DISCONTINUITY"><code>RESULT_POSITION_DISCONTINUITY</code></a> if the buffer was not contiguous with previously
written data.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.WriteException.html" title="class in com.google.android.exoplayer.audio">AudioTrack.WriteException</a></code> - If an error occurs writing the audio data.</dd>
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<pre>public&nbsp;void&nbsp;handleEndOfStream()</pre>
<div class="block">Ensures that the last data passed to <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#handleBuffer-java.nio.ByteBuffer-int-int-long-"><code>handleBuffer(ByteBuffer, int, int, long)</code></a> is
played out in full.</div>
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<pre>public&nbsp;boolean&nbsp;hasPendingData()</pre>
<div class="block">Returns whether the audio track has more data pending that will be played back.</div>
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<pre>public&nbsp;void&nbsp;setPlaybackParams(<a href="https://developer.android.com/reference/android/media/PlaybackParams.html?is-external=true" title="class or interface in android.media">PlaybackParams</a>&nbsp;playbackParams)</pre>
<div class="block">Sets the playback parameters. Only available for SDK_INT &gt;= 23</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></code> - if the Playback Parameters are not supported. That is,
SDK_INT &lt; 23.</dd>
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<h4>setStreamType</h4>
<pre>public&nbsp;boolean&nbsp;setStreamType(int&nbsp;streamType)</pre>
<div class="block">Sets the stream type for audio track. If the stream type has changed, <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#isInitialized--"><code>isInitialized()</code></a>
will return <code>false</code> and the caller must re-<a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize-int-"><code>initialize(int)</code></a> the audio track
before writing more data. The caller must not reuse the audio session identifier when
re-initializing with a new stream type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>streamType</code> - The stream type to use for audio output.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether the stream type changed.</dd>
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<h4>setVolume</h4>
<pre>public&nbsp;void&nbsp;setVolume(float&nbsp;volume)</pre>
<div class="block">Sets the playback volume.</div>
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<h4>pause</h4>
<pre>public&nbsp;void&nbsp;pause()</pre>
<div class="block">Pauses playback.</div>
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<h4>reset</h4>
<pre>public&nbsp;void&nbsp;reset()</pre>
<div class="block">Releases the underlying audio track asynchronously. Calling <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#initialize--"><code>initialize()</code></a> will block
until the audio track has been released, so it is safe to initialize immediately after
resetting. The audio session may remain active until the instance is <a href="../../../../../com/google/android/exoplayer/audio/AudioTrack.html#release--"><code>release()</code></a>d.</div>
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<h4>release</h4>
<pre>public&nbsp;void&nbsp;release()</pre>
<div class="block">Releases all resources associated with this instance.</div>
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