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<a href="crc_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"> * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at></span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * This file is part of FFmpeg.</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span>
<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00008"></a>00008 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00009"></a>00009 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span>
<a name="l00012"></a>00012 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00014"></a>00014 <span class="comment"> * Lesser General Public License for more details.</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<a name="l00017"></a>00017 <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span>
<a name="l00018"></a>00018 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#ifndef AVUTIL_CRC_H</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_CRC_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <stdint.h></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <stddef.h></span>
<a name="l00026"></a>00026 <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="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">/**</span>
<a name="l00029"></a>00029 <span class="comment"> * @defgroup lavu_crc32 CRC32</span>
<a name="l00030"></a>00030 <span class="comment"> * @ingroup lavu_crypto</span>
<a name="l00031"></a>00031 <span class="comment"> * @{</span>
<a name="l00032"></a>00032 <span class="comment"> */</span>
<a name="l00033"></a>00033
<a name="l00034"></a><a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">00034</a> <span class="keyword">typedef</span> uint32_t <a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a>;
<a name="l00035"></a>00035
<a name="l00036"></a><a class="code" href="group__lavu__crc32.html#gab7717a9f1179a5ac8516982f9f2997d2">00036</a> <span class="keyword">typedef</span> <span class="keyword">enum</span> {
<a name="l00037"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a892e48b7e846baeefd1b55a955f5cc66">00037</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a892e48b7e846baeefd1b55a955f5cc66">AV_CRC_8_ATM</a>,
<a name="l00038"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ae71c422e08cb83214c438ec352799e75">00038</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ae71c422e08cb83214c438ec352799e75">AV_CRC_16_ANSI</a>,
<a name="l00039"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a0e915db19602a96b5a83a953fd169a95">00039</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a0e915db19602a96b5a83a953fd169a95">AV_CRC_16_CCITT</a>,
<a name="l00040"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a2c95e44f51d497669d7c49d58018dea1">00040</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a2c95e44f51d497669d7c49d58018dea1">AV_CRC_32_IEEE</a>,
<a name="l00041"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aa43f268d15303373c90287522a4d4752">00041</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aa43f268d15303373c90287522a4d4752">AV_CRC_32_IEEE_LE</a>, <span class="comment">/*< reversed bitorder version of AV_CRC_32_IEEE */</span>
<a name="l00042"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aee02f172ec3ff10972855bdab591927a">00042</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aee02f172ec3ff10972855bdab591927a">AV_CRC_16_ANSI_LE</a>, <span class="comment">/*< reversed bitorder version of AV_CRC_16_ANSI */</span>
<a name="l00043"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a317de029f3dce59427fe4681c5a8af2a">00043</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a317de029f3dce59427fe4681c5a8af2a">AV_CRC_24_IEEE</a> = 12,
<a name="l00044"></a><a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ac72372c57b632a072de910c789ad08ee">00044</a> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ac72372c57b632a072de910c789ad08ee">AV_CRC_MAX</a>, <span class="comment">/*< Not part of public API! Do not use outside libavutil. */</span>
<a name="l00045"></a>00045 }<a class="code" href="group__lavu__crc32.html#gab7717a9f1179a5ac8516982f9f2997d2">AVCRCId</a>;
<a name="l00046"></a>00046 <span class="comment"></span>
<a name="l00047"></a>00047 <span class="comment">/**</span>
<a name="l00048"></a>00048 <span class="comment"> * Initialize a CRC table.</span>
<a name="l00049"></a>00049 <span class="comment"> * @param ctx must be an array of size sizeof(AVCRC)*257 or sizeof(AVCRC)*1024</span>
<a name="l00050"></a>00050 <span class="comment"> * @param le If 1, the lowest bit represents the coefficient for the highest</span>
<a name="l00051"></a>00051 <span class="comment"> * exponent of the corresponding polynomial (both for poly and</span>
<a name="l00052"></a>00052 <span class="comment"> * actual CRC).</span>
<a name="l00053"></a>00053 <span class="comment"> * If 0, you must swap the CRC parameter and the result of av_crc</span>
<a name="l00054"></a>00054 <span class="comment"> * if you need the standard representation (can be simplified in</span>
<a name="l00055"></a>00055 <span class="comment"> * most cases to e.g. bswap16):</span>
<a name="l00056"></a>00056 <span class="comment"> * av_bswap32(crc << (32-bits))</span>
<a name="l00057"></a>00057 <span class="comment"> * @param bits number of bits for the CRC</span>
<a name="l00058"></a>00058 <span class="comment"> * @param poly generator polynomial without the x**bits coefficient, in the</span>
<a name="l00059"></a>00059 <span class="comment"> * representation as specified by le</span>
<a name="l00060"></a>00060 <span class="comment"> * @param ctx_size size of ctx in bytes</span>
<a name="l00061"></a>00061 <span class="comment"> * @return <0 on failure</span>
<a name="l00062"></a>00062 <span class="comment"> */</span>
<a name="l00063"></a>00063 <span class="keywordtype">int</span> <a class="code" href="group__lavu__crc32.html#ga27f906ac7e618afdac0be18de678ac3d" title="Initialize a CRC table.">av_crc_init</a>(<a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a> *ctx, <span class="keywordtype">int</span> le, <span class="keywordtype">int</span> bits, uint32_t poly, <span class="keywordtype">int</span> ctx_size);
<a name="l00064"></a>00064 <span class="comment"></span>
<a name="l00065"></a>00065 <span class="comment">/**</span>
<a name="l00066"></a>00066 <span class="comment"> * Get an initialized standard CRC table.</span>
<a name="l00067"></a>00067 <span class="comment"> * @param crc_id ID of a standard CRC</span>
<a name="l00068"></a>00068 <span class="comment"> * @return a pointer to the CRC table or NULL on failure</span>
<a name="l00069"></a>00069 <span class="comment"> */</span>
<a name="l00070"></a>00070 <span class="keyword">const</span> <a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a> *<a class="code" href="group__lavu__crc32.html#gabb35ea72fdeee2645e4e57cae225ac2b" title="Get an initialized standard CRC table.">av_crc_get_table</a>(<a class="code" href="group__lavu__crc32.html#gab7717a9f1179a5ac8516982f9f2997d2">AVCRCId</a> crc_id);
<a name="l00071"></a>00071 <span class="comment"></span>
<a name="l00072"></a>00072 <span class="comment">/**</span>
<a name="l00073"></a>00073 <span class="comment"> * Calculate the CRC of a block.</span>
<a name="l00074"></a>00074 <span class="comment"> * @param crc CRC of previous blocks if any or initial value for CRC</span>
<a name="l00075"></a>00075 <span class="comment"> * @return CRC updated with the data from the given block</span>
<a name="l00076"></a>00076 <span class="comment"> *</span>
<a name="l00077"></a>00077 <span class="comment"> * @see av_crc_init() "le" parameter</span>
<a name="l00078"></a>00078 <span class="comment"> */</span>
<a name="l00079"></a>00079 uint32_t <a class="code" href="group__lavu__crc32.html#gae0feb73f66306494315f07de7ab57f80" title="Calculate the CRC of a block.">av_crc</a>(<span class="keyword">const</span> <a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a> *ctx, uint32_t crc,
<a name="l00080"></a>00080 <span class="keyword">const</span> uint8_t *buffer, <span class="keywordtype">size_t</span> length) <a class="code" href="attributes_8h.html#adc7fd5bb40d84900a3a30ef3318020c2">av_pure</a>;
<a name="l00081"></a>00081 <span class="comment"></span>
<a name="l00082"></a>00082 <span class="comment">/**</span>
<a name="l00083"></a>00083 <span class="comment"> * @}</span>
<a name="l00084"></a>00084 <span class="comment"> */</span>
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_CRC_H */</span>
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