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<a href="fifo_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * This file is part of FFmpeg.</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00012"></a>00012 <span class="comment"> * Lesser General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<a name="l00015"></a>00015 <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span>
<a name="l00016"></a>00016 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00017"></a>00017 <span class="comment"> */</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment">/**</span>
<a name="l00020"></a>00020 <span class="comment"> * @file</span>
<a name="l00021"></a>00021 <span class="comment"> * a very simple circular buffer FIFO implementation</span>
<a name="l00022"></a>00022 <span class="comment"> */</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="preprocessor">#ifndef AVUTIL_FIFO_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_FIFO_H</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <stdint.h></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include "<a class="code" href="avutil_8h.html" title="external API header">avutil.h</a>"</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="attributes_8h.html" title="Macro definitions for various function/variable attributes.">attributes.h</a>"</span>
<a name="l00030"></a>00030
<a name="l00031"></a><a class="code" href="structAVFifoBuffer.html">00031</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> {
<a name="l00032"></a><a class="code" href="structAVFifoBuffer.html#a7ca29002daed8cd1bf486019f3a64fb1">00032</a> uint8_t *<a class="code" href="structAVFifoBuffer.html#a7ca29002daed8cd1bf486019f3a64fb1">buffer</a>;
<a name="l00033"></a><a class="code" href="structAVFifoBuffer.html#a17c13f1f8557d63a3e031af1fdd80039">00033</a> uint8_t *<a class="code" href="structAVFifoBuffer.html#a3f75cfeac9302cdaf7badcfcba1a2193">rptr</a>, *<a class="code" href="structAVFifoBuffer.html#a17c13f1f8557d63a3e031af1fdd80039">wptr</a>, *<a class="code" href="structAVFifoBuffer.html#ad33d3db46bc5644805e2c8df0adedfb4">end</a>;
<a name="l00034"></a><a class="code" href="structAVFifoBuffer.html#ac2c3c492ec54ed30f1eb3ec8095f557c">00034</a> uint32_t <a class="code" href="structAVFifoBuffer.html#aa45e40b2e1d183fe73df52b91605034d">rndx</a>, <a class="code" href="structAVFifoBuffer.html#ac2c3c492ec54ed30f1eb3ec8095f557c">wndx</a>;
<a name="l00035"></a>00035 } <a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a>;
<a name="l00036"></a>00036 <span class="comment"></span>
<a name="l00037"></a>00037 <span class="comment">/**</span>
<a name="l00038"></a>00038 <span class="comment"> * Initialize an AVFifoBuffer.</span>
<a name="l00039"></a>00039 <span class="comment"> * @param size of FIFO</span>
<a name="l00040"></a>00040 <span class="comment"> * @return AVFifoBuffer or NULL in case of memory allocation failure</span>
<a name="l00041"></a>00041 <span class="comment"> */</span>
<a name="l00042"></a>00042 <a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *<a class="code" href="fifo_8h.html#adae9b18c5eed14fe851c5bb984ce374b" title="Initialize an AVFifoBuffer.">av_fifo_alloc</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size);
<a name="l00043"></a>00043 <span class="comment"></span>
<a name="l00044"></a>00044 <span class="comment">/**</span>
<a name="l00045"></a>00045 <span class="comment"> * Initialize an AVFifoBuffer.</span>
<a name="l00046"></a>00046 <span class="comment"> * @param nmemb number of elements</span>
<a name="l00047"></a>00047 <span class="comment"> * @param size size of the single element</span>
<a name="l00048"></a>00048 <span class="comment"> * @return AVFifoBuffer or NULL in case of memory allocation failure</span>
<a name="l00049"></a>00049 <span class="comment"> */</span>
<a name="l00050"></a>00050 <a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *<a class="code" href="fifo_8h.html#ada874c149988db27a46f8f5447cef478" title="Initialize an AVFifoBuffer.">av_fifo_alloc_array</a>(<span class="keywordtype">size_t</span> nmemb, <span class="keywordtype">size_t</span> size);
<a name="l00051"></a>00051 <span class="comment"></span>
<a name="l00052"></a>00052 <span class="comment">/**</span>
<a name="l00053"></a>00053 <span class="comment"> * Free an AVFifoBuffer.</span>
<a name="l00054"></a>00054 <span class="comment"> * @param f AVFifoBuffer to free</span>
<a name="l00055"></a>00055 <span class="comment"> */</span>
<a name="l00056"></a>00056 <span class="keywordtype">void</span> <a class="code" href="fifo_8h.html#ac41532c140aacb9ad12a22c859f944aa" title="Free an AVFifoBuffer.">av_fifo_free</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f);
<a name="l00057"></a>00057 <span class="comment"></span>
<a name="l00058"></a>00058 <span class="comment">/**</span>
<a name="l00059"></a>00059 <span class="comment"> * Free an AVFifoBuffer and reset pointer to NULL.</span>
<a name="l00060"></a>00060 <span class="comment"> * @param f AVFifoBuffer to free</span>
<a name="l00061"></a>00061 <span class="comment"> */</span>
<a name="l00062"></a>00062 <span class="keywordtype">void</span> <a class="code" href="fifo_8h.html#a612be59edb6ab388a82d1487d1bd0c4d" title="Free an AVFifoBuffer and reset pointer to NULL.">av_fifo_freep</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> **f);
<a name="l00063"></a>00063 <span class="comment"></span>
<a name="l00064"></a>00064 <span class="comment">/**</span>
<a name="l00065"></a>00065 <span class="comment"> * Reset the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied.</span>
<a name="l00066"></a>00066 <span class="comment"> * @param f AVFifoBuffer to reset</span>
<a name="l00067"></a>00067 <span class="comment"> */</span>
<a name="l00068"></a>00068 <span class="keywordtype">void</span> <a class="code" href="fifo_8h.html#a2f257d5cd93686b047c9b29ef6493e51" title="Reset the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied...">av_fifo_reset</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f);
<a name="l00069"></a>00069 <span class="comment"></span>
<a name="l00070"></a>00070 <span class="comment">/**</span>
<a name="l00071"></a>00071 <span class="comment"> * Return the amount of data in bytes in the AVFifoBuffer, that is the</span>
<a name="l00072"></a>00072 <span class="comment"> * amount of data you can read from it.</span>
<a name="l00073"></a>00073 <span class="comment"> * @param f AVFifoBuffer to read from</span>
<a name="l00074"></a>00074 <span class="comment"> * @return size</span>
<a name="l00075"></a>00075 <span class="comment"> */</span>
<a name="l00076"></a>00076 <span class="keywordtype">int</span> <a class="code" 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>(<span class="keyword">const</span> <a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f);
<a name="l00077"></a>00077 <span class="comment"></span>
<a name="l00078"></a>00078 <span class="comment">/**</span>
<a name="l00079"></a>00079 <span class="comment"> * Return the amount of space in bytes in the AVFifoBuffer, that is the</span>
<a name="l00080"></a>00080 <span class="comment"> * amount of data you can write into it.</span>
<a name="l00081"></a>00081 <span class="comment"> * @param f AVFifoBuffer to write into</span>
<a name="l00082"></a>00082 <span class="comment"> * @return size</span>
<a name="l00083"></a>00083 <span class="comment"> */</span>
<a name="l00084"></a>00084 <span class="keywordtype">int</span> <a class="code" href="fifo_8h.html#ac1e0d8ee7f1568cb40fa95a740c60f13" title="Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write int...">av_fifo_space</a>(<span class="keyword">const</span> <a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f);
<a name="l00085"></a>00085 <span class="comment"></span>
<a name="l00086"></a>00086 <span class="comment">/**</span>
<a name="l00087"></a>00087 <span class="comment"> * Feed data from an AVFifoBuffer to a user-supplied callback.</span>
<a name="l00088"></a>00088 <span class="comment"> * @param f AVFifoBuffer to read from</span>
<a name="l00089"></a>00089 <span class="comment"> * @param buf_size number of bytes to read</span>
<a name="l00090"></a>00090 <span class="comment"> * @param func generic read function</span>
<a name="l00091"></a>00091 <span class="comment"> * @param dest data destination</span>
<a name="l00092"></a>00092 <span class="comment"> */</span>
<a name="l00093"></a>00093 <span class="keywordtype">int</span> <a class="code" href="fifo_8h.html#ab708d2f19b7a9592caa278256787adb6" title="Feed data from an AVFifoBuffer to a user-supplied callback.">av_fifo_generic_read</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, <span class="keywordtype">void</span> *dest, <span class="keywordtype">int</span> buf_size, <span class="keywordtype">void</span> (*func)(<span class="keywordtype">void</span>*, <span class="keywordtype">void</span>*, <span class="keywordtype">int</span>));
<a name="l00094"></a>00094 <span class="comment"></span>
<a name="l00095"></a>00095 <span class="comment">/**</span>
<a name="l00096"></a>00096 <span class="comment"> * Feed data from a user-supplied callback to an AVFifoBuffer.</span>
<a name="l00097"></a>00097 <span class="comment"> * @param f AVFifoBuffer to write to</span>
<a name="l00098"></a>00098 <span class="comment"> * @param src data source; non-const since it may be used as a</span>
<a name="l00099"></a>00099 <span class="comment"> * modifiable context by the function defined in func</span>
<a name="l00100"></a>00100 <span class="comment"> * @param size number of bytes to write</span>
<a name="l00101"></a>00101 <span class="comment"> * @param func generic write function; the first parameter is src,</span>
<a name="l00102"></a>00102 <span class="comment"> * the second is dest_buf, the third is dest_buf_size.</span>
<a name="l00103"></a>00103 <span class="comment"> * func must return the number of bytes written to dest_buf, or <= 0 to</span>
<a name="l00104"></a>00104 <span class="comment"> * indicate no more data available to write.</span>
<a name="l00105"></a>00105 <span class="comment"> * If func is NULL, src is interpreted as a simple byte array for source data.</span>
<a name="l00106"></a>00106 <span class="comment"> * @return the number of bytes written to the FIFO</span>
<a name="l00107"></a>00107 <span class="comment"> */</span>
<a name="l00108"></a>00108 <span class="keywordtype">int</span> <a class="code" href="fifo_8h.html#ae95c15dcdd266b4005f8919e4f571180" title="Feed data from a user-supplied callback to an AVFifoBuffer.">av_fifo_generic_write</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, <span class="keywordtype">void</span> *src, <span class="keywordtype">int</span> size, <span class="keywordtype">int</span> (*func)(<span class="keywordtype">void</span>*, <span class="keywordtype">void</span>*, <span class="keywordtype">int</span>));
<a name="l00109"></a>00109 <span class="comment"></span>
<a name="l00110"></a>00110 <span class="comment">/**</span>
<a name="l00111"></a>00111 <span class="comment"> * Resize an AVFifoBuffer.</span>
<a name="l00112"></a>00112 <span class="comment"> * In case of reallocation failure, the old FIFO is kept unchanged.</span>
<a name="l00113"></a>00113 <span class="comment"> *</span>
<a name="l00114"></a>00114 <span class="comment"> * @param f AVFifoBuffer to resize</span>
<a name="l00115"></a>00115 <span class="comment"> * @param size new AVFifoBuffer size in bytes</span>
<a name="l00116"></a>00116 <span class="comment"> * @return <0 for failure, >=0 otherwise</span>
<a name="l00117"></a>00117 <span class="comment"> */</span>
<a name="l00118"></a>00118 <span class="keywordtype">int</span> <a class="code" href="fifo_8h.html#af50c043864cf09925aa4986e00a57067" title="Resize an AVFifoBuffer.">av_fifo_realloc2</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size);
<a name="l00119"></a>00119 <span class="comment"></span>
<a name="l00120"></a>00120 <span class="comment">/**</span>
<a name="l00121"></a>00121 <span class="comment"> * Enlarge an AVFifoBuffer.</span>
<a name="l00122"></a>00122 <span class="comment"> * In case of reallocation failure, the old FIFO is kept unchanged.</span>
<a name="l00123"></a>00123 <span class="comment"> * The new fifo size may be larger than the requested size.</span>
<a name="l00124"></a>00124 <span class="comment"> *</span>
<a name="l00125"></a>00125 <span class="comment"> * @param f AVFifoBuffer to resize</span>
<a name="l00126"></a>00126 <span class="comment"> * @param additional_space the amount of space in bytes to allocate in addition to av_fifo_size()</span>
<a name="l00127"></a>00127 <span class="comment"> * @return <0 for failure, >=0 otherwise</span>
<a name="l00128"></a>00128 <span class="comment"> */</span>
<a name="l00129"></a>00129 <span class="keywordtype">int</span> <a class="code" href="fifo_8h.html#a44a36b44adf5b278eeea1cb6d5b7033b" title="Enlarge an AVFifoBuffer.">av_fifo_grow</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> additional_space);
<a name="l00130"></a>00130 <span class="comment"></span>
<a name="l00131"></a>00131 <span class="comment">/**</span>
<a name="l00132"></a>00132 <span class="comment"> * Read and discard the specified amount of data from an AVFifoBuffer.</span>
<a name="l00133"></a>00133 <span class="comment"> * @param f AVFifoBuffer to read from</span>
<a name="l00134"></a>00134 <span class="comment"> * @param size amount of data to read in bytes</span>
<a name="l00135"></a>00135 <span class="comment"> */</span>
<a name="l00136"></a>00136 <span class="keywordtype">void</span> <a class="code" href="fifo_8h.html#a037f66cc2b92aebbc363617387d39f6f" title="Read and discard the specified amount of data from an AVFifoBuffer.">av_fifo_drain</a>(<a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, <span class="keywordtype">int</span> size);
<a name="l00137"></a>00137 <span class="comment"></span>
<a name="l00138"></a>00138 <span class="comment">/**</span>
<a name="l00139"></a>00139 <span class="comment"> * Return a pointer to the data stored in a FIFO buffer at a certain offset.</span>
<a name="l00140"></a>00140 <span class="comment"> * The FIFO buffer is not modified.</span>
<a name="l00141"></a>00141 <span class="comment"> *</span>
<a name="l00142"></a>00142 <span class="comment"> * @param f AVFifoBuffer to peek at, f must be non-NULL</span>
<a name="l00143"></a>00143 <span class="comment"> * @param offs an offset in bytes, its absolute value must be less</span>
<a name="l00144"></a>00144 <span class="comment"> * than the used buffer size or the returned pointer will</span>
<a name="l00145"></a>00145 <span class="comment"> * point outside to the buffer data.</span>
<a name="l00146"></a>00146 <span class="comment"> * The used buffer size can be checked with av_fifo_size().</span>
<a name="l00147"></a>00147 <span class="comment"> */</span>
<a name="l00148"></a><a class="code" href="fifo_8h.html#aa0212ac6ff8feab8846b9cc6df49149c">00148</a> <span class="keyword">static</span> <span class="keyword">inline</span> uint8_t *<a class="code" href="fifo_8h.html#aa0212ac6ff8feab8846b9cc6df49149c" title="Return a pointer to the data stored in a FIFO buffer at a certain offset.">av_fifo_peek2</a>(<span class="keyword">const</span> <a class="code" href="structAVFifoBuffer.html">AVFifoBuffer</a> *f, <span class="keywordtype">int</span> offs)
<a name="l00149"></a>00149 {
<a name="l00150"></a>00150 uint8_t *ptr = f-><a class="code" href="structAVFifoBuffer.html#a3f75cfeac9302cdaf7badcfcba1a2193">rptr</a> + offs;
<a name="l00151"></a>00151 <span class="keywordflow">if</span> (ptr >= f-><a class="code" href="structAVFifoBuffer.html#ad33d3db46bc5644805e2c8df0adedfb4">end</a>)
<a name="l00152"></a>00152 ptr = f-><a class="code" href="structAVFifoBuffer.html#a7ca29002daed8cd1bf486019f3a64fb1">buffer</a> + (ptr - f-><a class="code" href="structAVFifoBuffer.html#ad33d3db46bc5644805e2c8df0adedfb4">end</a>);
<a name="l00153"></a>00153 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ptr < f->buffer)
<a name="l00154"></a>00154 ptr = f-><a class="code" href="structAVFifoBuffer.html#ad33d3db46bc5644805e2c8df0adedfb4">end</a> - (f-><a class="code" href="structAVFifoBuffer.html#a7ca29002daed8cd1bf486019f3a64fb1">buffer</a> - ptr);
<a name="l00155"></a>00155 <span class="keywordflow">return</span> ptr;
<a name="l00156"></a>00156 }
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_FIFO_H */</span>
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