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<a href="eval_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) 2002 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 <span class="comment"></span>
<a name="l00021"></a>00021 <span class="comment">/**</span>
<a name="l00022"></a>00022 <span class="comment"> * @file</span>
<a name="l00023"></a>00023 <span class="comment"> * simple arithmetic expression evaluator</span>
<a name="l00024"></a>00024 <span class="comment"> */</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#ifndef AVUTIL_EVAL_H</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_EVAL_H</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="avutil_8h.html" title="external API header">avutil.h</a>"</span>
<a name="l00030"></a>00030
<a name="l00031"></a><a class="code" href="eval_8h.html#ac09a495d176de152a38347ca8ba069a8">00031</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="eval_8h.html#ac09a495d176de152a38347ca8ba069a8">AVExpr</a> <a class="code" href="eval_8h.html#ac09a495d176de152a38347ca8ba069a8">AVExpr</a>;
<a name="l00032"></a>00032 <span class="comment"></span>
<a name="l00033"></a>00033 <span class="comment">/**</span>
<a name="l00034"></a>00034 <span class="comment"> * Parse and evaluate an expression.</span>
<a name="l00035"></a>00035 <span class="comment"> * Note, this is significantly slower than av_expr_eval().</span>
<a name="l00036"></a>00036 <span class="comment"> *</span>
<a name="l00037"></a>00037 <span class="comment"> * @param res a pointer to a double where is put the result value of</span>
<a name="l00038"></a>00038 <span class="comment"> * the expression, or NAN in case of error</span>
<a name="l00039"></a>00039 <span class="comment"> * @param s expression as a zero terminated string, for example "1+2^3+5*5+sin(2/3)"</span>
<a name="l00040"></a>00040 <span class="comment"> * @param const_names NULL terminated array of zero terminated strings of constant identifiers, for example {"PI", "E", 0}</span>
<a name="l00041"></a>00041 <span class="comment"> * @param const_values a zero terminated array of values for the identifiers from const_names</span>
<a name="l00042"></a>00042 <span class="comment"> * @param func1_names NULL terminated array of zero terminated strings of funcs1 identifiers</span>
<a name="l00043"></a>00043 <span class="comment"> * @param funcs1 NULL terminated array of function pointers for functions which take 1 argument</span>
<a name="l00044"></a>00044 <span class="comment"> * @param func2_names NULL terminated array of zero terminated strings of funcs2 identifiers</span>
<a name="l00045"></a>00045 <span class="comment"> * @param funcs2 NULL terminated array of function pointers for functions which take 2 arguments</span>
<a name="l00046"></a>00046 <span class="comment"> * @param opaque a pointer which will be passed to all functions from funcs1 and funcs2</span>
<a name="l00047"></a>00047 <span class="comment"> * @param log_ctx parent logging context</span>
<a name="l00048"></a>00048 <span class="comment"> * @return >= 0 in case of success, a negative value corresponding to an</span>
<a name="l00049"></a>00049 <span class="comment"> * AVERROR code otherwise</span>
<a name="l00050"></a>00050 <span class="comment"> */</span>
<a name="l00051"></a>00051 <span class="keywordtype">int</span> <a class="code" href="eval_8h.html#a2d19271d518d49f3cb2df8c347856b18" title="Parse and evaluate an expression.">av_expr_parse_and_eval</a>(<span class="keywordtype">double</span> *res, <span class="keyword">const</span> <span class="keywordtype">char</span> *s,
<a name="l00052"></a>00052 <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> *const_names, <span class="keyword">const</span> <span class="keywordtype">double</span> *const_values,
<a name="l00053"></a>00053 <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> *func1_names, <span class="keywordtype">double</span> (* <span class="keyword">const</span> *funcs1)(<span class="keywordtype">void</span> *, <span class="keywordtype">double</span>),
<a name="l00054"></a>00054 <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> *func2_names, <span class="keywordtype">double</span> (* <span class="keyword">const</span> *funcs2)(<span class="keywordtype">void</span> *, <span class="keywordtype">double</span>, <span class="keywordtype">double</span>),
<a name="l00055"></a>00055 <span class="keywordtype">void</span> *opaque, <span class="keywordtype">int</span> log_offset, <span class="keywordtype">void</span> *log_ctx);
<a name="l00056"></a>00056 <span class="comment"></span>
<a name="l00057"></a>00057 <span class="comment">/**</span>
<a name="l00058"></a>00058 <span class="comment"> * Parse an expression.</span>
<a name="l00059"></a>00059 <span class="comment"> *</span>
<a name="l00060"></a>00060 <span class="comment"> * @param expr a pointer where is put an AVExpr containing the parsed</span>
<a name="l00061"></a>00061 <span class="comment"> * value in case of successful parsing, or NULL otherwise.</span>
<a name="l00062"></a>00062 <span class="comment"> * The pointed to AVExpr must be freed with av_expr_free() by the user</span>
<a name="l00063"></a>00063 <span class="comment"> * when it is not needed anymore.</span>
<a name="l00064"></a>00064 <span class="comment"> * @param s expression as a zero terminated string, for example "1+2^3+5*5+sin(2/3)"</span>
<a name="l00065"></a>00065 <span class="comment"> * @param const_names NULL terminated array of zero terminated strings of constant identifiers, for example {"PI", "E", 0}</span>
<a name="l00066"></a>00066 <span class="comment"> * @param func1_names NULL terminated array of zero terminated strings of funcs1 identifiers</span>
<a name="l00067"></a>00067 <span class="comment"> * @param funcs1 NULL terminated array of function pointers for functions which take 1 argument</span>
<a name="l00068"></a>00068 <span class="comment"> * @param func2_names NULL terminated array of zero terminated strings of funcs2 identifiers</span>
<a name="l00069"></a>00069 <span class="comment"> * @param funcs2 NULL terminated array of function pointers for functions which take 2 arguments</span>
<a name="l00070"></a>00070 <span class="comment"> * @param log_ctx parent logging context</span>
<a name="l00071"></a>00071 <span class="comment"> * @return >= 0 in case of success, a negative value corresponding to an</span>
<a name="l00072"></a>00072 <span class="comment"> * AVERROR code otherwise</span>
<a name="l00073"></a>00073 <span class="comment"> */</span>
<a name="l00074"></a>00074 <span class="keywordtype">int</span> <a class="code" href="eval_8h.html#ad3bf8f3330d1fd139de2ca156c313f34" title="Parse an expression.">av_expr_parse</a>(<a class="code" href="eval_8h.html#ac09a495d176de152a38347ca8ba069a8">AVExpr</a> **expr, <span class="keyword">const</span> <span class="keywordtype">char</span> *s,
<a name="l00075"></a>00075 <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> *const_names,
<a name="l00076"></a>00076 <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> *func1_names, <span class="keywordtype">double</span> (* <span class="keyword">const</span> *funcs1)(<span class="keywordtype">void</span> *, <span class="keywordtype">double</span>),
<a name="l00077"></a>00077 <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keyword">const</span> *func2_names, <span class="keywordtype">double</span> (* <span class="keyword">const</span> *funcs2)(<span class="keywordtype">void</span> *, <span class="keywordtype">double</span>, <span class="keywordtype">double</span>),
<a name="l00078"></a>00078 <span class="keywordtype">int</span> log_offset, <span class="keywordtype">void</span> *log_ctx);
<a name="l00079"></a>00079 <span class="comment"></span>
<a name="l00080"></a>00080 <span class="comment">/**</span>
<a name="l00081"></a>00081 <span class="comment"> * Evaluate a previously parsed expression.</span>
<a name="l00082"></a>00082 <span class="comment"> *</span>
<a name="l00083"></a>00083 <span class="comment"> * @param const_values a zero terminated array of values for the identifiers from av_expr_parse() const_names</span>
<a name="l00084"></a>00084 <span class="comment"> * @param opaque a pointer which will be passed to all functions from funcs1 and funcs2</span>
<a name="l00085"></a>00085 <span class="comment"> * @return the value of the expression</span>
<a name="l00086"></a>00086 <span class="comment"> */</span>
<a name="l00087"></a>00087 <span class="keywordtype">double</span> <a class="code" href="eval_8h.html#a569b6171b99e02f899d9ba8b5545cc27" title="Evaluate a previously parsed expression.">av_expr_eval</a>(<a class="code" href="eval_8h.html#ac09a495d176de152a38347ca8ba069a8">AVExpr</a> *e, <span class="keyword">const</span> <span class="keywordtype">double</span> *const_values, <span class="keywordtype">void</span> *opaque);
<a name="l00088"></a>00088 <span class="comment"></span>
<a name="l00089"></a>00089 <span class="comment">/**</span>
<a name="l00090"></a>00090 <span class="comment"> * Free a parsed expression previously created with av_expr_parse().</span>
<a name="l00091"></a>00091 <span class="comment"> */</span>
<a name="l00092"></a>00092 <span class="keywordtype">void</span> <a class="code" href="eval_8h.html#a01c05d7049a9208c2b22147a3f16c58c" title="Free a parsed expression previously created with av_expr_parse().">av_expr_free</a>(<a class="code" href="eval_8h.html#ac09a495d176de152a38347ca8ba069a8">AVExpr</a> *e);
<a name="l00093"></a>00093 <span class="comment"></span>
<a name="l00094"></a>00094 <span class="comment">/**</span>
<a name="l00095"></a>00095 <span class="comment"> * Parse the string in numstr and return its value as a double. If</span>
<a name="l00096"></a>00096 <span class="comment"> * the string is empty, contains only whitespaces, or does not contain</span>
<a name="l00097"></a>00097 <span class="comment"> * an initial substring that has the expected syntax for a</span>
<a name="l00098"></a>00098 <span class="comment"> * floating-point number, no conversion is performed. In this case,</span>
<a name="l00099"></a>00099 <span class="comment"> * returns a value of zero and the value returned in tail is the value</span>
<a name="l00100"></a>00100 <span class="comment"> * of numstr.</span>
<a name="l00101"></a>00101 <span class="comment"> *</span>
<a name="l00102"></a>00102 <span class="comment"> * @param numstr a string representing a number, may contain one of</span>
<a name="l00103"></a>00103 <span class="comment"> * the International System number postfixes, for example 'K', 'M',</span>
<a name="l00104"></a>00104 <span class="comment"> * 'G'. If 'i' is appended after the postfix, powers of 2 are used</span>
<a name="l00105"></a>00105 <span class="comment"> * instead of powers of 10. The 'B' postfix multiplies the value for</span>
<a name="l00106"></a>00106 <span class="comment"> * 8, and can be appended after another postfix or used alone. This</span>
<a name="l00107"></a>00107 <span class="comment"> * allows using for example 'KB', 'MiB', 'G' and 'B' as postfix.</span>
<a name="l00108"></a>00108 <span class="comment"> * @param tail if non-NULL puts here the pointer to the char next</span>
<a name="l00109"></a>00109 <span class="comment"> * after the last parsed character</span>
<a name="l00110"></a>00110 <span class="comment"> */</span>
<a name="l00111"></a>00111 <span class="keywordtype">double</span> <a class="code" href="eval_8h.html#a7d21905c92ee5af0bb529d2daf8cb7c3" title="Parse the string in numstr and return its value as a double.">av_strtod</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *numstr, <span class="keywordtype">char</span> **tail);
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_EVAL_H */</span>
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