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 <span id="projectnumber">2.7.1</span>
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<div class="title">AVClass Struct Reference</div> </div>
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<!-- doxytag: class="AVClass" -->
<p>Describe the class of an <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> context structure.
<a href="structAVClass.html#details">More...</a></p>
<p><code>#include <<a class="el" href="log_8h_source.html">log.h</a>></code></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#aa8883e113a3f2965abd008f7667db7eb">class_name</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The name of the class; usually it is the same name as the context structure type to which the <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> is associated. <a href="#aa8883e113a3f2965abd008f7667db7eb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const char *(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#abdb9b352e115fc158835afd56ef8b78b">item_name</a> )(void *ctx)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A pointer to a function which returns the name of a context instance ctx associated with the class. <a href="#abdb9b352e115fc158835afd56ef8b78b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structAVOption.html">AVOption</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a8f5d64df6aeeecce08ab33d0afb07f92">option</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">a pointer to the first option specified in the class if any or NULL <a href="#a8f5d64df6aeeecce08ab33d0afb07f92"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a7859d861c0924aa74d848f93253c263a">version</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">LIBAVUTIL_VERSION with which this structure was created. <a href="#a7859d861c0924aa74d848f93253c263a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#afbde6320c22278fac43732f7410b66e7">log_level_offset_offset</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Offset in the structure where log_level_offset is stored. <a href="#afbde6320c22278fac43732f7410b66e7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a88948c8a7c6515181771615a54a808bf">parent_log_context_offset</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Offset in the structure where a pointer to the parent context for logging is stored. <a href="#a88948c8a7c6515181771615a54a808bf"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void *(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#af13472aa40bca9eaad0d5b4ee4c00cab">child_next</a> )(void *obj, void *prev)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return next AVOptions-enabled child or NULL. <a href="#af13472aa40bca9eaad0d5b4ee4c00cab"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structAVClass.html">AVClass</a> *(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a015e0495e24b397b331e984d3b99d582">child_class_next</a> )(const struct <a class="el" href="structAVClass.html">AVClass</a> *prev)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return an <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> corresponding to the next potential AVOptions-enabled child. <a href="#a015e0495e24b397b331e984d3b99d582"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="log_8h.html#aeb1c06cc3e47a029ca6afeac782ac8f9">AVClassCategory</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a5fc161d93a0d65a608819da20b7203ba">category</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Category used for visualization (like color) This is only set if the category is equal for all objects using this class. <a href="#a5fc161d93a0d65a608819da20b7203ba"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="log_8h.html#aeb1c06cc3e47a029ca6afeac782ac8f9">AVClassCategory</a>(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a7a5708eb9185fbc45741612028f40976">get_category</a> )(void *ctx)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Callback to return the category. <a href="#a7a5708eb9185fbc45741612028f40976"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a2e3cca1bb1e7c441087eaad810b4384b">query_ranges</a> )(struct <a class="el" href="structAVOptionRanges.html">AVOptionRanges</a> **, void *obj, const char *key, int flags)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Callback to return the supported/allowed ranges. <a href="#a2e3cca1bb1e7c441087eaad810b4384b"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Describe the class of an <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> context structure. </p>
<p>That is an arbitrary struct of which the first field is a pointer to an <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> struct (e.g. <a class="el" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a>, <a class="el" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> etc.). </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00067">67</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
</div><hr/><h2>Field Documentation</h2>
<a class="anchor" id="aa8883e113a3f2965abd008f7667db7eb"></a><!-- doxytag: member="AVClass::class_name" ref="aa8883e113a3f2965abd008f7667db7eb" args="" -->
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<td class="memname">const char* <a class="el" href="structAVClass.html#aa8883e113a3f2965abd008f7667db7eb">AVClass::class_name</a></td>
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<div class="memdoc">
<p>The name of the class; usually it is the same name as the context structure type to which the <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> is associated. </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00072">72</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="abdb9b352e115fc158835afd56ef8b78b"></a><!-- doxytag: member="AVClass::item_name" ref="abdb9b352e115fc158835afd56ef8b78b" args=")(void *ctx)" -->
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<td class="memname">const char*(* <a class="el" href="structAVClass.html#abdb9b352e115fc158835afd56ef8b78b">AVClass::item_name</a>)(void *ctx)</td>
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<div class="memdoc">
<p>A pointer to a function which returns the name of a context instance ctx associated with the class. </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00078">78</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="a8f5d64df6aeeecce08ab33d0afb07f92"></a><!-- doxytag: member="AVClass::option" ref="a8f5d64df6aeeecce08ab33d0afb07f92" args="" -->
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<td class="memname">struct <a class="el" href="structAVOption.html">AVOption</a>* <a class="el" href="structAVClass.html#a8f5d64df6aeeecce08ab33d0afb07f92">AVClass::option</a></td>
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</div>
<div class="memdoc">
<p>a pointer to the first option specified in the class if any or NULL </p>
<dl class="see"><dt><b>See also:</b></dt><dd>av_set_default_options() </dd></dl>
<p>Definition at line <a class="el" href="log_8h_source.html#l00085">85</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="a7859d861c0924aa74d848f93253c263a"></a><!-- doxytag: member="AVClass::version" ref="a7859d861c0924aa74d848f93253c263a" args="" -->
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<td class="memname">int <a class="el" href="structAVClass.html#a7859d861c0924aa74d848f93253c263a">AVClass::version</a></td>
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<div class="memdoc">
<p>LIBAVUTIL_VERSION with which this structure was created. </p>
<p>This is used to allow fields to be added without requiring major version bumps everywhere. </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00093">93</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="afbde6320c22278fac43732f7410b66e7"></a><!-- doxytag: member="AVClass::log_level_offset_offset" ref="afbde6320c22278fac43732f7410b66e7" args="" -->
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<td class="memname">int <a class="el" href="structAVClass.html#afbde6320c22278fac43732f7410b66e7">AVClass::log_level_offset_offset</a></td>
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<p>Offset in the structure where log_level_offset is stored. </p>
<p>0 means there is no such variable </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00099">99</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="a88948c8a7c6515181771615a54a808bf"></a><!-- doxytag: member="AVClass::parent_log_context_offset" ref="a88948c8a7c6515181771615a54a808bf" args="" -->
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<td class="memname">int <a class="el" href="structAVClass.html#a88948c8a7c6515181771615a54a808bf">AVClass::parent_log_context_offset</a></td>
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<div class="memdoc">
<p>Offset in the structure where a pointer to the parent context for logging is stored. </p>
<p>For example a decoder could pass its <a class="el" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> to eval as such a parent context, which an <a class="el" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log()</a> implementation could then leverage to display the parent context. The offset can be NULL. </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00108">108</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="af13472aa40bca9eaad0d5b4ee4c00cab"></a><!-- doxytag: member="AVClass::child_next" ref="af13472aa40bca9eaad0d5b4ee4c00cab" args=")(void *obj, void *prev)" -->
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<td class="memname">void*(* <a class="el" href="structAVClass.html#af13472aa40bca9eaad0d5b4ee4c00cab">AVClass::child_next</a>)(void *obj, void *prev)</td>
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<p>Return next AVOptions-enabled child or NULL. </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00113">113</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="a015e0495e24b397b331e984d3b99d582"></a><!-- doxytag: member="AVClass::child_class_next" ref="a015e0495e24b397b331e984d3b99d582" args=")(const struct AVClass *prev)" -->
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<td class="memname">struct <a class="el" href="structAVClass.html">AVClass</a>*(* <a class="el" href="structAVClass.html#a015e0495e24b397b331e984d3b99d582">AVClass::child_class_next</a>)(const struct <a class="el" href="structAVClass.html">AVClass</a> *prev)<code> [read]</code></td>
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<p>Return an <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> corresponding to the next potential AVOptions-enabled child. </p>
<p>The difference between child_next and this is that child_next iterates over _already existing_ objects, while child_class_next iterates over _all possible_ children. </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00123">123</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="a5fc161d93a0d65a608819da20b7203ba"></a><!-- doxytag: member="AVClass::category" ref="a5fc161d93a0d65a608819da20b7203ba" args="" -->
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<td class="memname"><a class="el" href="log_8h.html#aeb1c06cc3e47a029ca6afeac782ac8f9">AVClassCategory</a> <a class="el" href="structAVClass.html#a5fc161d93a0d65a608819da20b7203ba">AVClass::category</a></td>
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<p>Category used for visualization (like color) This is only set if the category is equal for all objects using this class. </p>
<p>available since version (51 << 16 | 56 << 8 | 100) </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00130">130</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="a7a5708eb9185fbc45741612028f40976"></a><!-- doxytag: member="AVClass::get_category" ref="a7a5708eb9185fbc45741612028f40976" args=")(void *ctx)" -->
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<td class="memname"><a class="el" href="log_8h.html#aeb1c06cc3e47a029ca6afeac782ac8f9">AVClassCategory</a>(* <a class="el" href="structAVClass.html#a7a5708eb9185fbc45741612028f40976">AVClass::get_category</a>)(void *ctx)</td>
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<p>Callback to return the category. </p>
<p>available since version (51 << 16 | 59 << 8 | 100) </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00136">136</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<a class="anchor" id="a2e3cca1bb1e7c441087eaad810b4384b"></a><!-- doxytag: member="AVClass::query_ranges" ref="a2e3cca1bb1e7c441087eaad810b4384b" args=")(struct AVOptionRanges **, void *obj, const char *key, int flags)" -->
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<td class="memname">int(* <a class="el" href="structAVClass.html#a2e3cca1bb1e7c441087eaad810b4384b">AVClass::query_ranges</a>)(struct <a class="el" href="structAVOptionRanges.html">AVOptionRanges</a> **, void *obj, const char *key, int flags)</td>
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<p>Callback to return the supported/allowed ranges. </p>
<p>available since version (52.12) </p>
<p>Definition at line <a class="el" href="log_8h_source.html#l00142">142</a> of file <a class="el" href="log_8h_source.html">log.h</a>.</p>
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li>libavutil/<a class="el" href="log_8h_source.html">log.h</a></li>
</ul>
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