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<h2 title="Class AacUtil" class="title">Class AacUtil</h2>
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<pre>public final class <span class="typeNameLabel">AacUtil</span>
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></pre>
<div class="block">Utility methods for handling AAC audio streams.</div>
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<th class="colSecond" scope="col">Class</th>
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<tr class="altColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="AacUtil.AacAudioObjectType.html" title="annotation in com.google.android.exoplayer2.audio">AacUtil.AacAudioObjectType</a></span></code></th>
<td class="colLast">
<div class="block">Valid AAC Audio object types.</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="AacUtil.Config.html" title="class in com.google.android.exoplayer2.audio">AacUtil.Config</a></span></code></th>
<td class="colLast">
<div class="block">Holds sample format information for AAC audio.</div>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_ELD_MAX_RATE_BYTES_PER_SECOND">AAC_ELD_MAX_RATE_BYTES_PER_SECOND</a></span></code></th>
<td class="colLast">
<div class="block">Maximum rate for an AAC ELD audio stream, in bytes per second.</div>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_HE_AUDIO_SAMPLE_COUNT">AAC_HE_AUDIO_SAMPLE_COUNT</a></span></code></th>
<td class="colLast">
<div class="block">Number of raw audio samples that are produced per channel when decoding an AAC HE access unit.</div>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_HE_V1_MAX_RATE_BYTES_PER_SECOND">AAC_HE_V1_MAX_RATE_BYTES_PER_SECOND</a></span></code></th>
<td class="colLast">
<div class="block">Maximum rate for an AAC HE V1 audio stream, in bytes per second.</div>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_HE_V2_MAX_RATE_BYTES_PER_SECOND">AAC_HE_V2_MAX_RATE_BYTES_PER_SECOND</a></span></code></th>
<td class="colLast">
<div class="block">Maximum rate for an AAC HE V2 audio stream, in bytes per second.</div>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_LC_AUDIO_SAMPLE_COUNT">AAC_LC_AUDIO_SAMPLE_COUNT</a></span></code></th>
<td class="colLast">
<div class="block">Number of raw audio samples that are produced per channel when decoding an AAC LC access unit.</div>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_LC_MAX_RATE_BYTES_PER_SECOND">AAC_LC_MAX_RATE_BYTES_PER_SECOND</a></span></code></th>
<td class="colLast">
<div class="block">Maximum rate for an AAC LC audio stream, in bytes per second.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_LD_AUDIO_SAMPLE_COUNT">AAC_LD_AUDIO_SAMPLE_COUNT</a></span></code></th>
<td class="colLast">
<div class="block">Number of raw audio samples that are produced per channel when decoding an AAC LD access unit.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_XHE_AUDIO_SAMPLE_COUNT">AAC_XHE_AUDIO_SAMPLE_COUNT</a></span></code></th>
<td class="colLast">
<div class="block">Number of raw audio samples that are produced per channel when decoding an AAC XHE access unit.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AAC_XHE_MAX_RATE_BYTES_PER_SECOND">AAC_XHE_MAX_RATE_BYTES_PER_SECOND</a></span></code></th>
<td class="colLast">
<div class="block">Maximum rate for an AAC XHE audio stream, in bytes per second.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AUDIO_OBJECT_TYPE_AAC_ELD">AUDIO_OBJECT_TYPE_AAC_ELD</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AUDIO_OBJECT_TYPE_AAC_ER_BSAC">AUDIO_OBJECT_TYPE_AAC_ER_BSAC</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AUDIO_OBJECT_TYPE_AAC_LC">AUDIO_OBJECT_TYPE_AAC_LC</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AUDIO_OBJECT_TYPE_AAC_PS">AUDIO_OBJECT_TYPE_AAC_PS</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AUDIO_OBJECT_TYPE_AAC_SBR">AUDIO_OBJECT_TYPE_AAC_SBR</a></span></code></th>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
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<td class="colFirst"><code>static byte[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#buildAacLcAudioSpecificConfig(int,int)">buildAacLcAudioSpecificConfig</a></span>&#8203;(int&nbsp;sampleRate,
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<td class="colLast">
<div class="block">Builds a simple AAC LC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
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<td class="colFirst"><code>static byte[]</code></td>
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<div class="block">Builds a simple AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getEncodingForAudioObjectType(int)">getEncodingForAudioObjectType</a></span>&#8203;(int&nbsp;audioObjectType)</code></th>
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<div class="block">Returns the encoding for a given AAC audio object type.</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="AacUtil.Config.html" title="class in com.google.android.exoplayer2.audio">AacUtil.Config</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseAudioSpecificConfig(byte%5B%5D)">parseAudioSpecificConfig</a></span>&#8203;(byte[]&nbsp;audioSpecificConfig)</code></th>
<td class="colLast">
<div class="block">Parses an AAC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
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<td class="colFirst"><code>static <a href="AacUtil.Config.html" title="class in com.google.android.exoplayer2.audio">AacUtil.Config</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseAudioSpecificConfig(com.google.android.exoplayer2.util.ParsableBitArray,boolean)">parseAudioSpecificConfig</a></span>&#8203;(<a href="../util/ParsableBitArray.html" title="class in com.google.android.exoplayer2.util">ParsableBitArray</a>&nbsp;bitArray,
boolean&nbsp;forceReadToEnd)</code></th>
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<div class="block">Parses an AAC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
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<h4>AAC_LC_AUDIO_SAMPLE_COUNT</h4>
<pre>public static final&nbsp;int AAC_LC_AUDIO_SAMPLE_COUNT</pre>
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<pre>public static final&nbsp;int AAC_XHE_AUDIO_SAMPLE_COUNT</pre>
<div class="block">Number of raw audio samples that are produced per channel when decoding an AAC XHE access unit.</div>
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<pre>public static final&nbsp;int AAC_HE_AUDIO_SAMPLE_COUNT</pre>
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<pre>public static final&nbsp;int AAC_LD_AUDIO_SAMPLE_COUNT</pre>
<div class="block">Number of raw audio samples that are produced per channel when decoding an AAC LD access unit.</div>
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<pre>public static final&nbsp;int AAC_LC_MAX_RATE_BYTES_PER_SECOND</pre>
<div class="block">Maximum rate for an AAC LC audio stream, in bytes per second.</div>
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<pre>public static final&nbsp;int AAC_HE_V1_MAX_RATE_BYTES_PER_SECOND</pre>
<div class="block">Maximum rate for an AAC HE V1 audio stream, in bytes per second.</div>
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<pre>public static final&nbsp;int AAC_HE_V2_MAX_RATE_BYTES_PER_SECOND</pre>
<div class="block">Maximum rate for an AAC HE V2 audio stream, in bytes per second.</div>
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<pre>public static final&nbsp;int AAC_XHE_MAX_RATE_BYTES_PER_SECOND</pre>
<div class="block">Maximum rate for an AAC XHE audio stream, in bytes per second.
<p>Fraunhofer documentation says "500 kbit/s and above" for stereo, so we use a rate generously
above the 500 kbit/s level.</div>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.audio.AacUtil.AAC_XHE_MAX_RATE_BYTES_PER_SECOND">Constant Field Values</a></dd>
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<pre>public static final&nbsp;int AAC_ELD_MAX_RATE_BYTES_PER_SECOND</pre>
<div class="block">Maximum rate for an AAC ELD audio stream, in bytes per second.
<p>Fraunhofer documentation shows AAC-ELD as useful for up to ~ 64 kbit/s so we use this value.</div>
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<dt><span class="seeLabel">See Also:</span></dt>
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<pre>public static final&nbsp;int AUDIO_OBJECT_TYPE_AAC_LC</pre>
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<pre>public static final&nbsp;int AUDIO_OBJECT_TYPE_AAC_SBR</pre>
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<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.audio.AacUtil.AUDIO_OBJECT_TYPE_AAC_SBR">Constant Field Values</a></dd>
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<pre>public static final&nbsp;int AUDIO_OBJECT_TYPE_AAC_ER_BSAC</pre>
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<pre>public static final&nbsp;int AUDIO_OBJECT_TYPE_AAC_ELD</pre>
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<pre>public static final&nbsp;int AUDIO_OBJECT_TYPE_AAC_PS</pre>
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<pre>public static final&nbsp;int AUDIO_OBJECT_TYPE_AAC_XHE</pre>
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<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.audio.AacUtil.AUDIO_OBJECT_TYPE_AAC_XHE">Constant Field Values</a></dd>
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<pre class="methodSignature">public static&nbsp;<a href="AacUtil.Config.html" title="class in com.google.android.exoplayer2.audio">AacUtil.Config</a>&nbsp;parseAudioSpecificConfig&#8203;(byte[]&nbsp;audioSpecificConfig)
throws <a href="../ParserException.html" title="class in com.google.android.exoplayer2">ParserException</a></pre>
<div class="block">Parses an AAC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>audioSpecificConfig</code> - A byte array containing the AudioSpecificConfig to parse.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parsed configuration.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../ParserException.html" title="class in com.google.android.exoplayer2">ParserException</a></code> - If the AudioSpecificConfig cannot be parsed because it is invalid or
unsupported.</dd>
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<pre class="methodSignature">public static&nbsp;<a href="AacUtil.Config.html" title="class in com.google.android.exoplayer2.audio">AacUtil.Config</a>&nbsp;parseAudioSpecificConfig&#8203;(<a href="../util/ParsableBitArray.html" title="class in com.google.android.exoplayer2.util">ParsableBitArray</a>&nbsp;bitArray,
boolean&nbsp;forceReadToEnd)
throws <a href="../ParserException.html" title="class in com.google.android.exoplayer2">ParserException</a></pre>
<div class="block">Parses an AAC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>bitArray</code> - A <a href="../util/ParsableBitArray.html" title="class in com.google.android.exoplayer2.util"><code>ParsableBitArray</code></a> containing the AudioSpecificConfig to parse. The
position is advanced to the end of the AudioSpecificConfig.</dd>
<dd><code>forceReadToEnd</code> - Whether the entire AudioSpecificConfig should be read. Required for
knowing the length of the configuration payload.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parsed configuration.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../ParserException.html" title="class in com.google.android.exoplayer2">ParserException</a></code> - If the AudioSpecificConfig cannot be parsed because it is invalid or
unsupported.</dd>
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<pre class="methodSignature">public static&nbsp;byte[]&nbsp;buildAacLcAudioSpecificConfig&#8203;(int&nbsp;sampleRate,
int&nbsp;channelCount)</pre>
<div class="block">Builds a simple AAC LC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sampleRate</code> - The sample rate in Hz.</dd>
<dd><code>channelCount</code> - The channel count.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The AudioSpecificConfig.</dd>
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<pre class="methodSignature">public static&nbsp;byte[]&nbsp;buildAudioSpecificConfig&#8203;(int&nbsp;audioObjectType,
int&nbsp;sampleRateIndex,
int&nbsp;channelConfig)</pre>
<div class="block">Builds a simple AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>audioObjectType</code> - The audio object type.</dd>
<dd><code>sampleRateIndex</code> - The sample rate index.</dd>
<dd><code>channelConfig</code> - The channel configuration.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The AudioSpecificConfig.</dd>
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<pre class="methodSignature"><a href="../C.Encoding.html" title="annotation in com.google.android.exoplayer2">@Encoding</a>
public static&nbsp;int&nbsp;getEncodingForAudioObjectType&#8203;(<a href="AacUtil.AacAudioObjectType.html" title="annotation in com.google.android.exoplayer2.audio">@AacAudioObjectType</a>
int&nbsp;audioObjectType)</pre>
<div class="block">Returns the encoding for a given AAC audio object type.</div>
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