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<a href="#pub-attribs">Data Fields</a> </div>
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<div class="title">AVClass Struct Reference</div> </div>
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<div class="contents">
<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 class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:aa8883e113a3f2965abd008f7667db7eb"><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 class="memdesc:aa8883e113a3f2965abd008f7667db7eb"><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">More...</a><br/></td></tr>
<tr class="separator:aa8883e113a3f2965abd008f7667db7eb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abdb9b352e115fc158835afd56ef8b78b"><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 class="memdesc:abdb9b352e115fc158835afd56ef8b78b"><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">More...</a><br/></td></tr>
<tr class="separator:abdb9b352e115fc158835afd56ef8b78b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a75207076350fd2342191bc2091699f00"><td class="memItemLeft" align="right" valign="top">const struct <a class="el" href="structAVOption.html">AVOption</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a75207076350fd2342191bc2091699f00">option</a></td></tr>
<tr class="memdesc:a75207076350fd2342191bc2091699f00"><td class="mdescLeft"> </td><td class="mdescRight">a pointer to the first option specified in the class if any or NULL <a href="#a75207076350fd2342191bc2091699f00">More...</a><br/></td></tr>
<tr class="separator:a75207076350fd2342191bc2091699f00"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7859d861c0924aa74d848f93253c263a"><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 class="memdesc:a7859d861c0924aa74d848f93253c263a"><td class="mdescLeft"> </td><td class="mdescRight">LIBAVUTIL_VERSION with which this structure was created. <a href="#a7859d861c0924aa74d848f93253c263a">More...</a><br/></td></tr>
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<tr class="memitem:afbde6320c22278fac43732f7410b66e7"><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 class="memdesc:afbde6320c22278fac43732f7410b66e7"><td class="mdescLeft"> </td><td class="mdescRight">Offset in the structure where log_level_offset is stored. <a href="#afbde6320c22278fac43732f7410b66e7">More...</a><br/></td></tr>
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<tr class="memitem:a88948c8a7c6515181771615a54a808bf"><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 class="memdesc:a88948c8a7c6515181771615a54a808bf"><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">More...</a><br/></td></tr>
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<tr class="memitem:af13472aa40bca9eaad0d5b4ee4c00cab"><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 class="memdesc:af13472aa40bca9eaad0d5b4ee4c00cab"><td class="mdescLeft"> </td><td class="mdescRight">Return next AVOptions-enabled child or NULL. <a href="#af13472aa40bca9eaad0d5b4ee4c00cab">More...</a><br/></td></tr>
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<tr class="memitem:a0f4a274042064e70970f1be345c43343"><td class="memItemLeft" align="right" valign="top">const struct <a class="el" href="structAVClass.html">AVClass</a> *(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVClass.html#a0f4a274042064e70970f1be345c43343">child_class_next</a> )(const struct <a class="el" href="structAVClass.html">AVClass</a> *prev)</td></tr>
<tr class="memdesc:a0f4a274042064e70970f1be345c43343"><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="#a0f4a274042064e70970f1be345c43343">More...</a><br/></td></tr>
<tr class="separator:a0f4a274042064e70970f1be345c43343"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5fc161d93a0d65a608819da20b7203ba"><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 class="memdesc:a5fc161d93a0d65a608819da20b7203ba"><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">More...</a><br/></td></tr>
<tr class="separator:a5fc161d93a0d65a608819da20b7203ba"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7a5708eb9185fbc45741612028f40976"><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 class="memdesc:a7a5708eb9185fbc45741612028f40976"><td class="mdescLeft"> </td><td class="mdescRight">Callback to return the category. <a href="#a7a5708eb9185fbc45741612028f40976">More...</a><br/></td></tr>
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<tr class="memitem:a2e3cca1bb1e7c441087eaad810b4384b"><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 class="memdesc:a2e3cca1bb1e7c441087eaad810b4384b"><td class="mdescLeft"> </td><td class="mdescRight">Callback to return the supported/allowed ranges. <a href="#a2e3cca1bb1e7c441087eaad810b4384b">More...</a><br/></td></tr>
<tr class="separator:a2e3cca1bb1e7c441087eaad810b4384b"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">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><h2 class="groupheader">Field Documentation</h2>
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<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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<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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<td class="memname">const struct <a class="el" href="structAVOption.html">AVOption</a>* AVClass::option</td>
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<p>a pointer to the first option specified in the class if any or NULL </p>
<dl class="section see"><dt>See Also</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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<td class="memname">int AVClass::version</td>
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<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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<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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<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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<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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<td class="memname">const struct <a class="el" href="structAVClass.html">AVClass</a>*(* AVClass::child_class_next)(const struct <a class="el" href="structAVClass.html">AVClass</a> *prev)</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 <em>already existing</em> objects, while child_class_next iterates over <em>all possible</em> 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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<td class="memname"><a class="el" href="log_8h.html#aeb1c06cc3e47a029ca6afeac782ac8f9">AVClassCategory</a> AVClass::category</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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<td class="memname"><a class="el" href="log_8h.html#aeb1c06cc3e47a029ca6afeac782ac8f9">AVClassCategory</a>(* AVClass::get_category)(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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<td class="memname">int(* AVClass::query_ranges)(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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