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<p>a very simple circular buffer FIFO implementation
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <stdint.h></code><br/>
<code>#include "<a class="el" href="avutil_8h_source.html">avutil.h</a>"</code><br/>
<code>#include "<a class="el" href="attributes_8h_source.html">attributes.h</a>"</code><br/>
</div>
<p><a href="fifo_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a></td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#adae9b18c5eed14fe851c5bb984ce374b">av_fifo_alloc</a> (unsigned int size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. <a href="#adae9b18c5eed14fe851c5bb984ce374b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#ada874c149988db27a46f8f5447cef478">av_fifo_alloc_array</a> (size_t nmemb, size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. <a href="#ada874c149988db27a46f8f5447cef478"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#ac41532c140aacb9ad12a22c859f944aa">av_fifo_free</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Free an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. <a href="#ac41532c140aacb9ad12a22c859f944aa"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#a612be59edb6ab388a82d1487d1bd0c4d">av_fifo_freep</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> **f)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Free an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> and reset pointer to NULL. <a href="#a612be59edb6ab388a82d1487d1bd0c4d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#a2f257d5cd93686b047c9b29ef6493e51">av_fifo_reset</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reset the <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to the state right after av_fifo_alloc, in particular it is emptied. <a href="#a2f257d5cd93686b047c9b29ef6493e51"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#a81f4cea70d96846df7111daccc5ecce2">av_fifo_size</a> (const <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the amount of data in bytes in the <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>, that is the amount of data you can read from it. <a href="#a81f4cea70d96846df7111daccc5ecce2"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#ac1e0d8ee7f1568cb40fa95a740c60f13">av_fifo_space</a> (const <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the amount of space in bytes in the <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>, that is the amount of data you can write into it. <a href="#ac1e0d8ee7f1568cb40fa95a740c60f13"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#ab708d2f19b7a9592caa278256787adb6">av_fifo_generic_read</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, void *dest, int buf_size, void(*func)(void *, void *, int))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Feed data from an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to a user-supplied callback. <a href="#ab708d2f19b7a9592caa278256787adb6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#ae95c15dcdd266b4005f8919e4f571180">av_fifo_generic_write</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, void *src, int size, int(*func)(void *, void *, int))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Feed data from a user-supplied callback to an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. <a href="#ae95c15dcdd266b4005f8919e4f571180"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#af50c043864cf09925aa4986e00a57067">av_fifo_realloc2</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, unsigned int size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resize an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. <a href="#af50c043864cf09925aa4986e00a57067"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#a44a36b44adf5b278eeea1cb6d5b7033b">av_fifo_grow</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, unsigned int additional_space)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Enlarge an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. <a href="#a44a36b44adf5b278eeea1cb6d5b7033b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#a037f66cc2b92aebbc363617387d39f6f">av_fifo_drain</a> (<a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, int size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Read and discard the specified amount of data from an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. <a href="#a037f66cc2b92aebbc363617387d39f6f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static uint8_t * </td><td class="memItemRight" valign="bottom"><a class="el" href="fifo_8h.html#aa0212ac6ff8feab8846b9cc6df49149c">av_fifo_peek2</a> (const <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, int offs)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a pointer to the data stored in a FIFO buffer at a certain offset. <a href="#aa0212ac6ff8feab8846b9cc6df49149c"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>a very simple circular buffer FIFO implementation </p>
<p>Definition in file <a class="el" href="fifo_8h_source.html">fifo.h</a>.</p>
</div><hr/><h2>Function Documentation</h2>
<a class="anchor" id="adae9b18c5eed14fe851c5bb984ce374b"></a><!-- doxytag: member="fifo.h::av_fifo_alloc" ref="adae9b18c5eed14fe851c5bb984ce374b" args="(unsigned int size)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>* <a class="el" href="fifo_8h.html#adae9b18c5eed14fe851c5bb984ce374b">av_fifo_alloc</a> </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>size</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Initialize an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">size</td><td>of FIFO </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> or NULL in case of memory allocation failure </dd></dl>
</div>
</div>
<a class="anchor" id="ada874c149988db27a46f8f5447cef478"></a><!-- doxytag: member="fifo.h::av_fifo_alloc_array" ref="ada874c149988db27a46f8f5447cef478" args="(size_t nmemb, size_t size)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>* <a class="el" href="fifo_8h.html#ada874c149988db27a46f8f5447cef478">av_fifo_alloc_array</a> </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>nmemb</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Initialize an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nmemb</td><td>number of elements </td></tr>
<tr><td class="paramname">size</td><td>size of the single element </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> or NULL in case of memory allocation failure </dd></dl>
</div>
</div>
<a class="anchor" id="ac41532c140aacb9ad12a22c859f944aa"></a><!-- doxytag: member="fifo.h::av_fifo_free" ref="ac41532c140aacb9ad12a22c859f944aa" args="(AVFifoBuffer *f)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="fifo_8h.html#ac41532c140aacb9ad12a22c859f944aa">av_fifo_free</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Free an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to free </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a612be59edb6ab388a82d1487d1bd0c4d"></a><!-- doxytag: member="fifo.h::av_fifo_freep" ref="a612be59edb6ab388a82d1487d1bd0c4d" args="(AVFifoBuffer **f)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="fifo_8h.html#a612be59edb6ab388a82d1487d1bd0c4d">av_fifo_freep</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> ** </td>
<td class="paramname"><em>f</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Free an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> and reset pointer to NULL. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to free </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a2f257d5cd93686b047c9b29ef6493e51"></a><!-- doxytag: member="fifo.h::av_fifo_reset" ref="a2f257d5cd93686b047c9b29ef6493e51" args="(AVFifoBuffer *f)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="fifo_8h.html#a2f257d5cd93686b047c9b29ef6493e51">av_fifo_reset</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Reset the <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to the state right after av_fifo_alloc, in particular it is emptied. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to reset </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a81f4cea70d96846df7111daccc5ecce2"></a><!-- doxytag: member="fifo.h::av_fifo_size" ref="a81f4cea70d96846df7111daccc5ecce2" args="(const AVFifoBuffer *f)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int <a class="el" href="fifo_8h.html#a81f4cea70d96846df7111daccc5ecce2">av_fifo_size</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Return the amount of data in bytes in the <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>, that is the amount of data you can read from it. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to read from </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>size </dd></dl>
</div>
</div>
<a class="anchor" id="ac1e0d8ee7f1568cb40fa95a740c60f13"></a><!-- doxytag: member="fifo.h::av_fifo_space" ref="ac1e0d8ee7f1568cb40fa95a740c60f13" args="(const AVFifoBuffer *f)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int <a class="el" href="fifo_8h.html#ac1e0d8ee7f1568cb40fa95a740c60f13">av_fifo_space</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Return the amount of space in bytes in the <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>, that is the amount of data you can write into it. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to write into </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>size </dd></dl>
</div>
</div>
<a class="anchor" id="ab708d2f19b7a9592caa278256787adb6"></a><!-- doxytag: member="fifo.h::av_fifo_generic_read" ref="ab708d2f19b7a9592caa278256787adb6" args="(AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int))" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int <a class="el" href="fifo_8h.html#ab708d2f19b7a9592caa278256787adb6">av_fifo_generic_read</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>dest</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>buf_size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void(*)(void *, void *, int) </td>
<td class="paramname"><em>func</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Feed data from an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to a user-supplied callback. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to read from </td></tr>
<tr><td class="paramname">buf_size</td><td>number of bytes to read </td></tr>
<tr><td class="paramname">func</td><td>generic read function </td></tr>
<tr><td class="paramname">dest</td><td>data destination </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ae95c15dcdd266b4005f8919e4f571180"></a><!-- doxytag: member="fifo.h::av_fifo_generic_write" ref="ae95c15dcdd266b4005f8919e4f571180" args="(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))" -->
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<td class="memname">int <a class="el" href="fifo_8h.html#ae95c15dcdd266b4005f8919e4f571180">av_fifo_generic_write</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>src</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int(*)(void *, void *, int) </td>
<td class="paramname"><em>func</em> </td>
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<td>)</td>
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<p>Feed data from a user-supplied callback to an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to write to </td></tr>
<tr><td class="paramname">src</td><td>data source; non-const since it may be used as a modifiable context by the function defined in func </td></tr>
<tr><td class="paramname">size</td><td>number of bytes to write </td></tr>
<tr><td class="paramname">func</td><td>generic write function; the first parameter is src, the second is dest_buf, the third is dest_buf_size. func must return the number of bytes written to dest_buf, or <= 0 to indicate no more data available to write. If func is NULL, src is interpreted as a simple byte array for source data. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>the number of bytes written to the FIFO </dd></dl>
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<a class="anchor" id="af50c043864cf09925aa4986e00a57067"></a><!-- doxytag: member="fifo.h::av_fifo_realloc2" ref="af50c043864cf09925aa4986e00a57067" args="(AVFifoBuffer *f, unsigned int size)" -->
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<td class="memname">int <a class="el" href="fifo_8h.html#af50c043864cf09925aa4986e00a57067">av_fifo_realloc2</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>size</em> </td>
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<td></td>
<td>)</td>
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<p>Resize an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. </p>
<p>In case of reallocation failure, the old FIFO is kept unchanged.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to resize </td></tr>
<tr><td class="paramname">size</td><td>new <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> size in bytes </td></tr>
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</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd><0 for failure, >=0 otherwise </dd></dl>
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<a class="anchor" id="a44a36b44adf5b278eeea1cb6d5b7033b"></a><!-- doxytag: member="fifo.h::av_fifo_grow" ref="a44a36b44adf5b278eeea1cb6d5b7033b" args="(AVFifoBuffer *f, unsigned int additional_space)" -->
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<td class="memname">int <a class="el" href="fifo_8h.html#a44a36b44adf5b278eeea1cb6d5b7033b">av_fifo_grow</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>additional_space</em> </td>
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<td></td>
<td>)</td>
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<p>Enlarge an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. </p>
<p>In case of reallocation failure, the old FIFO is kept unchanged. The new fifo size may be larger than the requested size.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to resize </td></tr>
<tr><td class="paramname">additional_space</td><td>the amount of space in bytes to allocate in addition to <a class="el" href="fifo_8h.html#a81f4cea70d96846df7111daccc5ecce2" title="Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...">av_fifo_size()</a> </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd><0 for failure, >=0 otherwise </dd></dl>
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<a class="anchor" id="a037f66cc2b92aebbc363617387d39f6f"></a><!-- doxytag: member="fifo.h::av_fifo_drain" ref="a037f66cc2b92aebbc363617387d39f6f" args="(AVFifoBuffer *f, int size)" -->
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<td class="memname">void <a class="el" href="fifo_8h.html#a037f66cc2b92aebbc363617387d39f6f">av_fifo_drain</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Read and discard the specified amount of data from an <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a>. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to read from </td></tr>
<tr><td class="paramname">size</td><td>amount of data to read in bytes </td></tr>
</table>
</dd>
</dl>
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<a class="anchor" id="aa0212ac6ff8feab8846b9cc6df49149c"></a><!-- doxytag: member="fifo.h::av_fifo_peek2" ref="aa0212ac6ff8feab8846b9cc6df49149c" args="(const AVFifoBuffer *f, int offs)" -->
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<td class="memname">static uint8_t* <a class="el" href="fifo_8h.html#aa0212ac6ff8feab8846b9cc6df49149c">av_fifo_peek2</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> * </td>
<td class="paramname"><em>f</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>offs</em> </td>
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<td>)</td>
<td></td><td><code> [inline, static]</code></td>
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<p>Return a pointer to the data stored in a FIFO buffer at a certain offset. </p>
<p>The FIFO buffer is not modified.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">f</td><td><a class="el" href="structAVFifoBuffer.html">AVFifoBuffer</a> to peek at, f must be non-NULL </td></tr>
<tr><td class="paramname">offs</td><td>an offset in bytes, its absolute value must be less than the used buffer size or the returned pointer will point outside to the buffer data. The used buffer size can be checked with <a class="el" href="fifo_8h.html#a81f4cea70d96846df7111daccc5ecce2" title="Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...">av_fifo_size()</a>. </td></tr>
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</dd>
</dl>
<p>Definition at line <a class="el" href="fifo_8h_source.html#l00148">148</a> of file <a class="el" href="fifo_8h_source.html">fifo.h</a>.</p>
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