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<h2 title="Class NalUnitUtil" class="title">Class NalUnitUtil</h2>
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<pre>public final class <span class="typeNameLabel">NalUnitUtil</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">Utility methods for handling H.264/AVC and H.265/HEVC NAL units.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.PpsData.html" title="class in com.google.android.exoplayer.util">NalUnitUtil.PpsData</a></span></code>
<div class="block">Holds data parsed from a picture parameter set NAL unit.</div>
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<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
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<td class="colFirst"><code>static float[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#ASPECT_RATIO_IDC_VALUES">ASPECT_RATIO_IDC_VALUES</a></span></code>
<div class="block">Aspect ratios indexed by aspect_ratio_idc, in H.264 and H.265 SPSs.</div>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#EXTENDED_SAR">EXTENDED_SAR</a></span></code>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#NAL_START_CODE">NAL_START_CODE</a></span></code>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#clearPrefixFlags-boolean:A-">clearPrefixFlags</a></span>(boolean[]&nbsp;prefixFlags)</code>
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<td class="colFirst"><code>static void</code></td>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#findNalUnit-byte:A-int-int-boolean:A-">findNalUnit</a></span>(byte[]&nbsp;data,
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#getH265NalUnitType-byte:A-int-">getH265NalUnitType</a></span>(byte[]&nbsp;data,
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<div class="block">Gets the type of the H.265 NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#getNalUnitType-byte:A-int-">getNalUnitType</a></span>(byte[]&nbsp;data,
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<div class="block">Gets the type of the NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#parseChildNalUnit-com.google.android.exoplayer.util.ParsableByteArray-">parseChildNalUnit</a></span>(<a href="../../../../../com/google/android/exoplayer/util/ParsableByteArray.html" title="class in com.google.android.exoplayer.util">ParsableByteArray</a>&nbsp;atom)</code>
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<td class="colFirst"><code>static <a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.PpsData.html" title="class in com.google.android.exoplayer.util">NalUnitUtil.PpsData</a></code></td>
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<h4>NAL_START_CODE</h4>
<pre>public static final&nbsp;byte[] NAL_START_CODE</pre>
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<pre>public static final&nbsp;int EXTENDED_SAR</pre>
<div class="block">Value for aspect_ratio_idc indicating an extended aspect ratio, in H.264 and H.265 SPSs.</div>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer.util.NalUnitUtil.EXTENDED_SAR">Constant Field Values</a></dd>
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<pre>public static final&nbsp;float[] ASPECT_RATIO_IDC_VALUES</pre>
<div class="block">Aspect ratios indexed by aspect_ratio_idc, in H.264 and H.265 SPSs.</div>
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<pre>public static&nbsp;int&nbsp;unescapeStream(byte[]&nbsp;data,
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buffers.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to unescape.</dd>
<dd><code>limit</code> - The limit (exclusive) of the data to unescape.</dd>
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<dd>The length of the unescaped data.</dd>
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<pre>public static&nbsp;void&nbsp;discardToSps(<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;data)</pre>
<div class="block">Discards data from the buffer up to the first SPS, where <code>data.position()</code> is interpreted
as the length of the buffer.
<p>
When the method returns, <code>data.position()</code> will contain the new length of the buffer. If
the buffer is not empty it is guaranteed to start with an SPS.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - Buffer containing start code delimited NAL units.</dd>
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<pre>public static&nbsp;byte[]&nbsp;parseChildNalUnit(<a href="../../../../../com/google/android/exoplayer/util/ParsableByteArray.html" title="class in com.google.android.exoplayer.util">ParsableByteArray</a>&nbsp;atom)</pre>
<div class="block">Constructs and returns a NAL unit with a start code followed by the data in <code>atom</code>.</div>
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<h4>getNalUnitType</h4>
<pre>public static&nbsp;int&nbsp;getNalUnitType(byte[]&nbsp;data,
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<div class="block">Gets the type of the NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to search.</dd>
<dd><code>offset</code> - The start offset of a NAL unit. Must lie between <code>-3</code> (inclusive) and
<code>data.length - 3</code> (exclusive).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The type of the unit.</dd>
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<h4>getH265NalUnitType</h4>
<pre>public static&nbsp;int&nbsp;getH265NalUnitType(byte[]&nbsp;data,
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<div class="block">Gets the type of the H.265 NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to search.</dd>
<dd><code>offset</code> - The start offset of a NAL unit. Must lie between <code>-3</code> (inclusive) and
<code>data.length - 3</code> (exclusive).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The type of the unit.</dd>
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<pre>public static&nbsp;<a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.SpsData.html" title="class in com.google.android.exoplayer.util">NalUnitUtil.SpsData</a>&nbsp;parseSpsNalUnit(<a href="../../../../../com/google/android/exoplayer/util/ParsableBitArray.html" title="class in com.google.android.exoplayer.util">ParsableBitArray</a>&nbsp;data)</pre>
<div class="block">Parses an SPS NAL unit using the syntax defined in ITU-T Recommendation H.264 (2013) subsection
7.3.2.1.1.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - A <a href="../../../../../com/google/android/exoplayer/util/ParsableBitArray.html" title="class in com.google.android.exoplayer.util"><code>ParsableBitArray</code></a> containing the SPS data. The position must to set to the
start of the data (i.e. the first bit of the profile_idc field).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A parsed representation of the SPS data.</dd>
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<h4>parsePpsNalUnit</h4>
<pre>public static&nbsp;<a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.PpsData.html" title="class in com.google.android.exoplayer.util">NalUnitUtil.PpsData</a>&nbsp;parsePpsNalUnit(<a href="../../../../../com/google/android/exoplayer/util/ParsableBitArray.html" title="class in com.google.android.exoplayer.util">ParsableBitArray</a>&nbsp;data)</pre>
<div class="block">Parses a PPS NAL unit using the syntax defined in ITU-T Recommendation H.264 (2013) subsection
7.3.2.2.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - A <a href="../../../../../com/google/android/exoplayer/util/ParsableBitArray.html" title="class in com.google.android.exoplayer.util"><code>ParsableBitArray</code></a> containing the PPS data. The position must to set to the
start of the data (i.e. the first bit of the pic_parameter_set_id field).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A parsed representation of the PPS data.</dd>
</dl>
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<h4>findNalUnit</h4>
<pre>public static&nbsp;int&nbsp;findNalUnit(byte[]&nbsp;data,
int&nbsp;startOffset,
int&nbsp;endOffset,
boolean[]&nbsp;prefixFlags)</pre>
<div class="block">Finds the first NAL unit in <code>data</code>.
<p>
If <code>prefixFlags</code> is null then the first three bytes of a NAL unit must be entirely
contained within the part of the array being searched in order for it to be found.
<p>
When <code>prefixFlags</code> is non-null, this method supports finding NAL units whose first four
bytes span <code>data</code> arrays passed to successive calls. To use this feature, pass the same
<code>prefixFlags</code> parameter to successive calls. State maintained in this parameter enables
the detection of such NAL units. Note that when using this feature, the return value may be 3,
2 or 1 less than <code>startOffset</code>, to indicate a NAL unit starting 3, 2 or 1 bytes before
the first byte in the current array.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to search.</dd>
<dd><code>startOffset</code> - The offset (inclusive) in the data to start the search.</dd>
<dd><code>endOffset</code> - The offset (exclusive) in the data to end the search.</dd>
<dd><code>prefixFlags</code> - A boolean array whose first three elements are used to store the state
required to detect NAL units where the NAL unit prefix spans array boundaries. The array
must be at least 3 elements long.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The offset of the NAL unit, or <code>endOffset</code> if a NAL unit was not found.</dd>
</dl>
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<h4>clearPrefixFlags</h4>
<pre>public static&nbsp;void&nbsp;clearPrefixFlags(boolean[]&nbsp;prefixFlags)</pre>
<div class="block">Clears prefix flags, as used by <a href="../../../../../com/google/android/exoplayer/util/NalUnitUtil.html#findNalUnit-byte:A-int-int-boolean:A-"><code>findNalUnit(byte[], int, int, boolean[])</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prefixFlags</code> - The flags to clear.</dd>
</dl>
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