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 <span id="projectnumber">2.7.1</span>
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<a href="common_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 <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"> * common internal and external API header</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_COMMON_H</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_COMMON_H</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span>
<a name="l00029"></a>00029 <span class="preprocessor">#if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span>
<a name="l00033"></a>00033 <span class="preprocessor">#include <errno.h></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include <inttypes.h></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include <limits.h></span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <math.h></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <stdint.h></span>
<a name="l00038"></a>00038 <span class="preprocessor">#include <stdio.h></span>
<a name="l00039"></a>00039 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00040"></a>00040 <span class="preprocessor">#include <string.h></span>
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <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="l00043"></a>00043 <span class="preprocessor">#include "<a class="code" href="libavutil_2version_8h.html" title="Libavutil version macros.">version.h</a>"</span>
<a name="l00044"></a>00044 <span class="preprocessor">#include "libavutil/avconfig.h"</span>
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="preprocessor">#if AV_HAVE_BIGENDIAN</span>
<a name="l00047"></a>00047 <span class="preprocessor"></span><span class="preprocessor"># define AV_NE(be, le) (be)</span>
<a name="l00048"></a>00048 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00049"></a><a class="code" href="common_8h.html#a309bdca20f6a78431379fc69442d98ea">00049</a> <span class="preprocessor"></span><span class="preprocessor"># define AV_NE(be, le) (le)</span>
<a name="l00050"></a>00050 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span>
<a name="l00052"></a>00052 <span class="comment">//rounded division & shift</span>
<a name="l00053"></a><a class="code" href="common_8h.html#aa79ca71ef110a498d8275cbf7aa75a93">00053</a> <span class="preprocessor">#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))</span>
<a name="l00054"></a>00054 <span class="preprocessor"></span><span class="comment">/* assume b>0 */</span>
<a name="l00055"></a><a class="code" href="common_8h.html#a7a2a86492a286d6d20678da1dbb00525">00055</a> <span class="preprocessor">#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))</span>
<a name="l00056"></a>00056 <span class="preprocessor"></span><span class="comment">/* assume a>0 and b>0 */</span>
<a name="l00057"></a><a class="code" href="common_8h.html#a6fa4d4c04620a5112cafd0a86dca9f0a">00057</a> <span class="preprocessor">#define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \</span>
<a name="l00058"></a>00058 <span class="preprocessor"> : ((a) + (1<<(b)) - 1) >> (b))</span>
<a name="l00059"></a><a class="code" href="common_8h.html#a5117194af5289224bceaaa5466586d8f">00059</a> <span class="preprocessor"></span><span class="preprocessor">#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))</span>
<a name="l00060"></a><a class="code" href="common_8h.html#aa0241c1e04e45d7be1b388d83ab57f22">00060</a> <span class="preprocessor"></span><span class="preprocessor">#define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))</span>
<a name="l00061"></a><a class="code" href="common_8h.html#ad6d88940cfc29c13a3e51ded211fc242">00061</a> <span class="preprocessor"></span><span class="preprocessor">#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))</span>
<a name="l00062"></a><a class="code" href="common_8h.html#af5e4ff7761996bc901e59bd59756268d">00062</a> <span class="preprocessor"></span><span class="preprocessor">#define FFSIGN(a) ((a) > 0 ? 1 : -1)</span>
<a name="l00063"></a>00063 <span class="preprocessor"></span>
<a name="l00064"></a><a class="code" href="common_8h.html#a9960bd6780a9b16a216a57be1ee04359">00064</a> <span class="preprocessor">#define FFMAX(a,b) ((a) > (b) ? (a) : (b))</span>
<a name="l00065"></a><a class="code" href="common_8h.html#a013fdaa079045ec5632fe121e211e516">00065</a> <span class="preprocessor"></span><span class="preprocessor">#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)</span>
<a name="l00066"></a><a class="code" href="common_8h.html#a0f84cbd7fd810cd678157c98cbfad4b0">00066</a> <span class="preprocessor"></span><span class="preprocessor">#define FFMIN(a,b) ((a) > (b) ? (b) : (a))</span>
<a name="l00067"></a><a class="code" href="common_8h.html#af6afbffa12562b076c34055bdcb3ad65">00067</a> <span class="preprocessor"></span><span class="preprocessor">#define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)</span>
<a name="l00068"></a>00068 <span class="preprocessor"></span>
<a name="l00069"></a><a class="code" href="common_8h.html#a09a0bb7d8fcfac416de7a5fe7fd8b0f1">00069</a> <span class="preprocessor">#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)</span>
<a name="l00070"></a><a class="code" href="common_8h.html#a3508a98d3ee7e2c9a4841fe264cf70f7">00070</a> <span class="preprocessor"></span><span class="preprocessor">#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))</span>
<a name="l00071"></a><a class="code" href="common_8h.html#acae4ba605b3a7d535b7ac058ffe96892">00071</a> <span class="preprocessor"></span><span class="preprocessor">#define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))</span>
<a name="l00072"></a>00072 <span class="preprocessor"></span>
<a name="l00073"></a>00073 <span class="comment">/* misc math functions */</span>
<a name="l00074"></a>00074 <span class="comment"></span>
<a name="l00075"></a>00075 <span class="comment">/**</span>
<a name="l00076"></a>00076 <span class="comment"> * Reverse the order of the bits of an 8-bits unsigned integer.</span>
<a name="l00077"></a>00077 <span class="comment"> */</span>
<a name="l00078"></a>00078 <span class="preprocessor">#if FF_API_AV_REVERSE</span>
<a name="l00079"></a>00079 <span class="preprocessor"></span><span class="keyword">extern</span> <a class="code" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> <span class="keyword">const</span> uint8_t av_reverse[256];
<a name="l00080"></a>00080 <span class="preprocessor">#endif</span>
<a name="l00081"></a>00081 <span class="preprocessor"></span>
<a name="l00082"></a>00082 <span class="preprocessor">#ifdef HAVE_AV_CONFIG_H</span>
<a name="l00083"></a>00083 <span class="preprocessor"></span><span class="preprocessor"># include "config.h"</span>
<a name="l00084"></a>00084 <span class="preprocessor"># include "intmath.h"</span>
<a name="l00085"></a>00085 <span class="preprocessor">#endif</span>
<a name="l00086"></a>00086 <span class="preprocessor"></span>
<a name="l00087"></a>00087 <span class="comment">/* Pull in unguarded fallback defines at the end of this file. */</span>
<a name="l00088"></a>00088 <span class="preprocessor">#include "<a class="code" href="common_8h.html" title="common internal and external API header">common.h</a>"</span>
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="preprocessor">#ifndef av_log2</span>
<a name="l00091"></a>00091 <span class="preprocessor"></span><a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">int</span> <a class="code" href="common_8h.html#a10e72d08c6a66c91cf7218532631684e" title="Reverse the order of the bits of an 8-bits unsigned integer.">av_log2</a>(<span class="keywordtype">unsigned</span> v);
<a name="l00092"></a>00092 <span class="preprocessor">#endif</span>
<a name="l00093"></a>00093 <span class="preprocessor"></span>
<a name="l00094"></a>00094 <span class="preprocessor">#ifndef av_log2_16bit</span>
<a name="l00095"></a>00095 <span class="preprocessor"></span><a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">int</span> <a class="code" href="common_8h.html#a8a1d3f387b1eab65327453f6a8e7e9ae">av_log2_16bit</a>(<span class="keywordtype">unsigned</span> v);
<a name="l00096"></a>00096 <span class="preprocessor">#endif</span>
<a name="l00097"></a>00097 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00098"></a>00098 <span class="comment">/**</span>
<a name="l00099"></a>00099 <span class="comment"> * Clip a signed integer value into the amin-amax range.</span>
<a name="l00100"></a>00100 <span class="comment"> * @param a value to clip</span>
<a name="l00101"></a>00101 <span class="comment"> * @param amin minimum value of the clip range</span>
<a name="l00102"></a>00102 <span class="comment"> * @param amax maximum value of the clip range</span>
<a name="l00103"></a>00103 <span class="comment"> * @return clipped value</span>
<a name="l00104"></a>00104 <span class="comment"> */</span>
<a name="l00105"></a><a class="code" href="common_8h.html#a465f39d69c5a5fe0e070b6ec4d0fed29">00105</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">int</span> <a class="code" href="common_8h.html#a465f39d69c5a5fe0e070b6ec4d0fed29" title="Clip a signed integer value into the amin-amax range.">av_clip_c</a>(<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> amin, <span class="keywordtype">int</span> amax)
<a name="l00106"></a>00106 {
<a name="l00107"></a>00107 <span class="preprocessor">#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2</span>
<a name="l00108"></a>00108 <span class="preprocessor"></span> <span class="keywordflow">if</span> (amin > amax) abort();
<a name="l00109"></a>00109 <span class="preprocessor">#endif</span>
<a name="l00110"></a>00110 <span class="preprocessor"></span> <span class="keywordflow">if</span> (a < amin) <span class="keywordflow">return</span> amin;
<a name="l00111"></a>00111 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (a > amax) <span class="keywordflow">return</span> amax;
<a name="l00112"></a>00112 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114 <span class="comment"></span>
<a name="l00115"></a>00115 <span class="comment">/**</span>
<a name="l00116"></a>00116 <span class="comment"> * Clip a signed 64bit integer value into the amin-amax range.</span>
<a name="l00117"></a>00117 <span class="comment"> * @param a value to clip</span>
<a name="l00118"></a>00118 <span class="comment"> * @param amin minimum value of the clip range</span>
<a name="l00119"></a>00119 <span class="comment"> * @param amax maximum value of the clip range</span>
<a name="l00120"></a>00120 <span class="comment"> * @return clipped value</span>
<a name="l00121"></a>00121 <span class="comment"> */</span>
<a name="l00122"></a><a class="code" href="common_8h.html#aa4ed7e144d5b8397cff8656e9c786cb2">00122</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> int64_t <a class="code" href="common_8h.html#aa4ed7e144d5b8397cff8656e9c786cb2" title="Clip a signed 64bit integer value into the amin-amax range.">av_clip64_c</a>(int64_t a, int64_t amin, int64_t amax)
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 <span class="preprocessor">#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2</span>
<a name="l00125"></a>00125 <span class="preprocessor"></span> <span class="keywordflow">if</span> (amin > amax) abort();
<a name="l00126"></a>00126 <span class="preprocessor">#endif</span>
<a name="l00127"></a>00127 <span class="preprocessor"></span> <span class="keywordflow">if</span> (a < amin) <span class="keywordflow">return</span> amin;
<a name="l00128"></a>00128 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (a > amax) <span class="keywordflow">return</span> amax;
<a name="l00129"></a>00129 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00130"></a>00130 }
<a name="l00131"></a>00131 <span class="comment"></span>
<a name="l00132"></a>00132 <span class="comment">/**</span>
<a name="l00133"></a>00133 <span class="comment"> * Clip a signed integer value into the 0-255 range.</span>
<a name="l00134"></a>00134 <span class="comment"> * @param a value to clip</span>
<a name="l00135"></a>00135 <span class="comment"> * @return clipped value</span>
<a name="l00136"></a>00136 <span class="comment"> */</span>
<a name="l00137"></a><a class="code" href="common_8h.html#a8deed4a1ec39d0b1ab82d1f0e590a6f5">00137</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> uint8_t <a class="code" href="common_8h.html#a8deed4a1ec39d0b1ab82d1f0e590a6f5" title="Clip a signed integer value into the 0-255 range.">av_clip_uint8_c</a>(<span class="keywordtype">int</span> a)
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 <span class="keywordflow">if</span> (a&(~0xFF)) <span class="keywordflow">return</span> (-a)>>31;
<a name="l00140"></a>00140 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142 <span class="comment"></span>
<a name="l00143"></a>00143 <span class="comment">/**</span>
<a name="l00144"></a>00144 <span class="comment"> * Clip a signed integer value into the -128,127 range.</span>
<a name="l00145"></a>00145 <span class="comment"> * @param a value to clip</span>
<a name="l00146"></a>00146 <span class="comment"> * @return clipped value</span>
<a name="l00147"></a>00147 <span class="comment"> */</span>
<a name="l00148"></a><a class="code" href="common_8h.html#a3091e5b3f2a340c3ddb29f6733fb2a4c">00148</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> int8_t <a class="code" href="common_8h.html#a3091e5b3f2a340c3ddb29f6733fb2a4c" title="Clip a signed integer value into the -128,127 range.">av_clip_int8_c</a>(<span class="keywordtype">int</span> a)
<a name="l00149"></a>00149 {
<a name="l00150"></a>00150 <span class="keywordflow">if</span> ((a+0x80U) & ~0xFF) <span class="keywordflow">return</span> (a>>31) ^ 0x7F;
<a name="l00151"></a>00151 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 <span class="comment"></span>
<a name="l00154"></a>00154 <span class="comment">/**</span>
<a name="l00155"></a>00155 <span class="comment"> * Clip a signed integer value into the 0-65535 range.</span>
<a name="l00156"></a>00156 <span class="comment"> * @param a value to clip</span>
<a name="l00157"></a>00157 <span class="comment"> * @return clipped value</span>
<a name="l00158"></a>00158 <span class="comment"> */</span>
<a name="l00159"></a><a class="code" href="common_8h.html#a70a9a6b77373c47c48ef93511edaf9ce">00159</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> uint16_t <a class="code" href="common_8h.html#a70a9a6b77373c47c48ef93511edaf9ce" title="Clip a signed integer value into the 0-65535 range.">av_clip_uint16_c</a>(<span class="keywordtype">int</span> a)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 <span class="keywordflow">if</span> (a&(~0xFFFF)) <span class="keywordflow">return</span> (-a)>>31;
<a name="l00162"></a>00162 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 <span class="comment"></span>
<a name="l00165"></a>00165 <span class="comment">/**</span>
<a name="l00166"></a>00166 <span class="comment"> * Clip a signed integer value into the -32768,32767 range.</span>
<a name="l00167"></a>00167 <span class="comment"> * @param a value to clip</span>
<a name="l00168"></a>00168 <span class="comment"> * @return clipped value</span>
<a name="l00169"></a>00169 <span class="comment"> */</span>
<a name="l00170"></a><a class="code" href="common_8h.html#aae95fa7073f1caa097951161985240f7">00170</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> int16_t <a class="code" href="common_8h.html#aae95fa7073f1caa097951161985240f7" title="Clip a signed integer value into the -32768,32767 range.">av_clip_int16_c</a>(<span class="keywordtype">int</span> a)
<a name="l00171"></a>00171 {
<a name="l00172"></a>00172 <span class="keywordflow">if</span> ((a+0x8000U) & ~0xFFFF) <span class="keywordflow">return</span> (a>>31) ^ 0x7FFF;
<a name="l00173"></a>00173 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175 <span class="comment"></span>
<a name="l00176"></a>00176 <span class="comment">/**</span>
<a name="l00177"></a>00177 <span class="comment"> * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.</span>
<a name="l00178"></a>00178 <span class="comment"> * @param a value to clip</span>
<a name="l00179"></a>00179 <span class="comment"> * @return clipped value</span>
<a name="l00180"></a>00180 <span class="comment"> */</span>
<a name="l00181"></a><a class="code" href="common_8h.html#ae245fb123a6e2a664c4806c034421e1e">00181</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> int32_t <a class="code" href="common_8h.html#ae245fb123a6e2a664c4806c034421e1e" title="Clip a signed 64-bit integer value into the -2147483648,2147483647 range.">av_clipl_int32_c</a>(int64_t a)
<a name="l00182"></a>00182 {
<a name="l00183"></a>00183 <span class="keywordflow">if</span> ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) <span class="keywordflow">return</span> (int32_t)((a>>63) ^ 0x7FFFFFFF);
<a name="l00184"></a>00184 <span class="keywordflow">else</span> <span class="keywordflow">return</span> (int32_t)a;
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186 <span class="comment"></span>
<a name="l00187"></a>00187 <span class="comment">/**</span>
<a name="l00188"></a>00188 <span class="comment"> * Clip a signed integer into the -(2^p),(2^p-1) range.</span>
<a name="l00189"></a>00189 <span class="comment"> * @param a value to clip</span>
<a name="l00190"></a>00190 <span class="comment"> * @param p bit position to clip at</span>
<a name="l00191"></a>00191 <span class="comment"> * @return clipped value</span>
<a name="l00192"></a>00192 <span class="comment"> */</span>
<a name="l00193"></a><a class="code" href="common_8h.html#ad24148f23ca385e16b14885f52360abe">00193</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">int</span> <a class="code" href="common_8h.html#ad24148f23ca385e16b14885f52360abe" title="Clip a signed integer into the -(2^p),(2^p-1) range.">av_clip_intp2_c</a>(<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> p)
<a name="l00194"></a>00194 {
<a name="l00195"></a>00195 <span class="keywordflow">if</span> ((a + (1 << p)) & ~((2 << p) - 1))
<a name="l00196"></a>00196 <span class="keywordflow">return</span> (a >> 31) ^ ((1 << p) - 1);
<a name="l00197"></a>00197 <span class="keywordflow">else</span>
<a name="l00198"></a>00198 <span class="keywordflow">return</span> a;
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200 <span class="comment"></span>
<a name="l00201"></a>00201 <span class="comment">/**</span>
<a name="l00202"></a>00202 <span class="comment"> * Clip a signed integer to an unsigned power of two range.</span>
<a name="l00203"></a>00203 <span class="comment"> * @param a value to clip</span>
<a name="l00204"></a>00204 <span class="comment"> * @param p bit position to clip at</span>
<a name="l00205"></a>00205 <span class="comment"> * @return clipped value</span>
<a name="l00206"></a>00206 <span class="comment"> */</span>
<a name="l00207"></a><a class="code" href="common_8h.html#a867dba37c785d27d42b272aa968efda8">00207</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">unsigned</span> <a class="code" href="common_8h.html#a867dba37c785d27d42b272aa968efda8" title="Clip a signed integer to an unsigned power of two range.">av_clip_uintp2_c</a>(<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> p)
<a name="l00208"></a>00208 {
<a name="l00209"></a>00209 <span class="keywordflow">if</span> (a & ~((1<<p) - 1)) <span class="keywordflow">return</span> -a >> 31 & ((1<<p) - 1);
<a name="l00210"></a>00210 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00211"></a>00211 }
<a name="l00212"></a>00212 <span class="comment"></span>
<a name="l00213"></a>00213 <span class="comment">/**</span>
<a name="l00214"></a>00214 <span class="comment"> * Clear high bits from an unsigned integer starting with specific bit position</span>
<a name="l00215"></a>00215 <span class="comment"> * @param a value to clip</span>
<a name="l00216"></a>00216 <span class="comment"> * @param p bit position to clip at</span>
<a name="l00217"></a>00217 <span class="comment"> * @return clipped value</span>
<a name="l00218"></a>00218 <span class="comment"> */</span>
<a name="l00219"></a><a class="code" href="common_8h.html#a3cb38786757c8f2a468560d9d7a6c59c">00219</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">unsigned</span> <a class="code" href="common_8h.html#a3cb38786757c8f2a468560d9d7a6c59c" title="Clear high bits from an unsigned integer starting with specific bit position.">av_mod_uintp2_c</a>(<span class="keywordtype">unsigned</span> a, <span class="keywordtype">unsigned</span> p)
<a name="l00220"></a>00220 {
<a name="l00221"></a>00221 <span class="keywordflow">return</span> a & ((1 << p) - 1);
<a name="l00222"></a>00222 }
<a name="l00223"></a>00223 <span class="comment"></span>
<a name="l00224"></a>00224 <span class="comment">/**</span>
<a name="l00225"></a>00225 <span class="comment"> * Add two signed 32-bit values with saturation.</span>
<a name="l00226"></a>00226 <span class="comment"> *</span>
<a name="l00227"></a>00227 <span class="comment"> * @param a one value</span>
<a name="l00228"></a>00228 <span class="comment"> * @param b another value</span>
<a name="l00229"></a>00229 <span class="comment"> * @return sum with signed saturation</span>
<a name="l00230"></a>00230 <span class="comment"> */</span>
<a name="l00231"></a><a class="code" href="common_8h.html#a2ff75b1bf7fd1a261dd2f2919e8d23e1">00231</a> <span class="keyword">static</span> av_always_inline <span class="keywordtype">int</span> <a class="code" href="common_8h.html#a2ff75b1bf7fd1a261dd2f2919e8d23e1" title="Add two signed 32-bit values with saturation.">av_sat_add32_c</a>(<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> b)
<a name="l00232"></a>00232 {
<a name="l00233"></a>00233 <span class="keywordflow">return</span> av_clipl_int32((int64_t)a + b);
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235 <span class="comment"></span>
<a name="l00236"></a>00236 <span class="comment">/**</span>
<a name="l00237"></a>00237 <span class="comment"> * Add a doubled value to another value with saturation at both stages.</span>
<a name="l00238"></a>00238 <span class="comment"> *</span>
<a name="l00239"></a>00239 <span class="comment"> * @param a first value</span>
<a name="l00240"></a>00240 <span class="comment"> * @param b value doubled and added to a</span>
<a name="l00241"></a>00241 <span class="comment"> * @return sum with signed saturation</span>
<a name="l00242"></a>00242 <span class="comment"> */</span>
<a name="l00243"></a><a class="code" href="common_8h.html#af235b48678850832493ac21160ff8458">00243</a> <span class="keyword">static</span> av_always_inline <span class="keywordtype">int</span> <a class="code" href="common_8h.html#af235b48678850832493ac21160ff8458" title="Add a doubled value to another value with saturation at both stages.">av_sat_dadd32_c</a>(<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> b)
<a name="l00244"></a>00244 {
<a name="l00245"></a>00245 <span class="keywordflow">return</span> av_sat_add32(a, av_sat_add32(b, b));
<a name="l00246"></a>00246 }
<a name="l00247"></a>00247 <span class="comment"></span>
<a name="l00248"></a>00248 <span class="comment">/**</span>
<a name="l00249"></a>00249 <span class="comment"> * Clip a float value into the amin-amax range.</span>
<a name="l00250"></a>00250 <span class="comment"> * @param a value to clip</span>
<a name="l00251"></a>00251 <span class="comment"> * @param amin minimum value of the clip range</span>
<a name="l00252"></a>00252 <span class="comment"> * @param amax maximum value of the clip range</span>
<a name="l00253"></a>00253 <span class="comment"> * @return clipped value</span>
<a name="l00254"></a>00254 <span class="comment"> */</span>
<a name="l00255"></a><a class="code" href="common_8h.html#a7d5a6331d8708d4516aeab2413f86392">00255</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">float</span> <a class="code" href="common_8h.html#a7d5a6331d8708d4516aeab2413f86392" title="Clip a float value into the amin-amax range.">av_clipf_c</a>(<span class="keywordtype">float</span> a, <span class="keywordtype">float</span> amin, <span class="keywordtype">float</span> amax)
<a name="l00256"></a>00256 {
<a name="l00257"></a>00257 <span class="preprocessor">#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2</span>
<a name="l00258"></a>00258 <span class="preprocessor"></span> <span class="keywordflow">if</span> (amin > amax) abort();
<a name="l00259"></a>00259 <span class="preprocessor">#endif</span>
<a name="l00260"></a>00260 <span class="preprocessor"></span> <span class="keywordflow">if</span> (a < amin) <span class="keywordflow">return</span> amin;
<a name="l00261"></a>00261 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (a > amax) <span class="keywordflow">return</span> amax;
<a name="l00262"></a>00262 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264 <span class="comment"></span>
<a name="l00265"></a>00265 <span class="comment">/**</span>
<a name="l00266"></a>00266 <span class="comment"> * Clip a double value into the amin-amax range.</span>
<a name="l00267"></a>00267 <span class="comment"> * @param a value to clip</span>
<a name="l00268"></a>00268 <span class="comment"> * @param amin minimum value of the clip range</span>
<a name="l00269"></a>00269 <span class="comment"> * @param amax maximum value of the clip range</span>
<a name="l00270"></a>00270 <span class="comment"> * @return clipped value</span>
<a name="l00271"></a>00271 <span class="comment"> */</span>
<a name="l00272"></a><a class="code" href="common_8h.html#a9a257b0d07c767325ee48b5e16e0b97f">00272</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">double</span> <a class="code" href="common_8h.html#a9a257b0d07c767325ee48b5e16e0b97f" title="Clip a double value into the amin-amax range.">av_clipd_c</a>(<span class="keywordtype">double</span> a, <span class="keywordtype">double</span> amin, <span class="keywordtype">double</span> amax)
<a name="l00273"></a>00273 {
<a name="l00274"></a>00274 <span class="preprocessor">#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2</span>
<a name="l00275"></a>00275 <span class="preprocessor"></span> <span class="keywordflow">if</span> (amin > amax) abort();
<a name="l00276"></a>00276 <span class="preprocessor">#endif</span>
<a name="l00277"></a>00277 <span class="preprocessor"></span> <span class="keywordflow">if</span> (a < amin) <span class="keywordflow">return</span> amin;
<a name="l00278"></a>00278 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (a > amax) <span class="keywordflow">return</span> amax;
<a name="l00279"></a>00279 <span class="keywordflow">else</span> <span class="keywordflow">return</span> a;
<a name="l00280"></a>00280 }
<a name="l00281"></a>00281 <span class="comment"></span>
<a name="l00282"></a>00282 <span class="comment">/** Compute ceil(log2(x)).</span>
<a name="l00283"></a>00283 <span class="comment"> * @param x value used to compute ceil(log2(x))</span>
<a name="l00284"></a>00284 <span class="comment"> * @return computed ceiling of log2(x)</span>
<a name="l00285"></a>00285 <span class="comment"> */</span>
<a name="l00286"></a><a class="code" href="common_8h.html#ad94b463be296690fc9c096d55203b42b">00286</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">int</span> <a class="code" href="common_8h.html#ad94b463be296690fc9c096d55203b42b" title="Compute ceil(log2(x)).">av_ceil_log2_c</a>(<span class="keywordtype">int</span> x)
<a name="l00287"></a>00287 {
<a name="l00288"></a>00288 <span class="keywordflow">return</span> <a class="code" href="common_8h.html#a10e72d08c6a66c91cf7218532631684e" title="Reverse the order of the bits of an 8-bits unsigned integer.">av_log2</a>((x - 1) << 1);
<a name="l00289"></a>00289 }
<a name="l00290"></a>00290 <span class="comment"></span>
<a name="l00291"></a>00291 <span class="comment">/**</span>
<a name="l00292"></a>00292 <span class="comment"> * Count number of bits set to one in x</span>
<a name="l00293"></a>00293 <span class="comment"> * @param x value to count bits of</span>
<a name="l00294"></a>00294 <span class="comment"> * @return the number of bits set to one in x</span>
<a name="l00295"></a>00295 <span class="comment"> */</span>
<a name="l00296"></a><a class="code" href="common_8h.html#a73ced2c040c8e53f58a6073c3f3927b5">00296</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">int</span> <a class="code" href="common_8h.html#a73ced2c040c8e53f58a6073c3f3927b5" title="Count number of bits set to one in x.">av_popcount_c</a>(uint32_t x)
<a name="l00297"></a>00297 {
<a name="l00298"></a>00298 x -= (x >> 1) & 0x55555555;
<a name="l00299"></a>00299 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
<a name="l00300"></a>00300 x = (x + (x >> 4)) & 0x0F0F0F0F;
<a name="l00301"></a>00301 x += x >> 8;
<a name="l00302"></a>00302 <span class="keywordflow">return</span> (x + (x >> 16)) & 0x3F;
<a name="l00303"></a>00303 }
<a name="l00304"></a>00304 <span class="comment"></span>
<a name="l00305"></a>00305 <span class="comment">/**</span>
<a name="l00306"></a>00306 <span class="comment"> * Count number of bits set to one in x</span>
<a name="l00307"></a>00307 <span class="comment"> * @param x value to count bits of</span>
<a name="l00308"></a>00308 <span class="comment"> * @return the number of bits set to one in x</span>
<a name="l00309"></a>00309 <span class="comment"> */</span>
<a name="l00310"></a><a class="code" href="common_8h.html#a1016d46d60ca2d27d8ab2af5f0f7c57a">00310</a> <span class="keyword">static</span> av_always_inline <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a> <span class="keywordtype">int</span> <a class="code" href="common_8h.html#a1016d46d60ca2d27d8ab2af5f0f7c57a" title="Count number of bits set to one in x.">av_popcount64_c</a>(uint64_t x)
<a name="l00311"></a>00311 {
<a name="l00312"></a>00312 <span class="keywordflow">return</span> av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
<a name="l00313"></a>00313 }
<a name="l00314"></a>00314
<a name="l00315"></a><a class="code" href="common_8h.html#a19c68e2b5efcbab914d79db1e4fee734">00315</a> <span class="preprocessor">#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))</span>
<a name="l00316"></a><a class="code" href="common_8h.html#a1e233db224cd0a3079fd4572d1a3d717">00316</a> <span class="preprocessor"></span><span class="preprocessor">#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))</span>
<a name="l00317"></a>00317 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00318"></a>00318 <span class="comment">/**</span>
<a name="l00319"></a>00319 <span class="comment"> * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.</span>
<a name="l00320"></a>00320 <span class="comment"> *</span>
<a name="l00321"></a>00321 <span class="comment"> * @param val Output value, must be an lvalue of type uint32_t.</span>
<a name="l00322"></a>00322 <span class="comment"> * @param GET_BYTE Expression reading one byte from the input.</span>
<a name="l00323"></a>00323 <span class="comment"> * Evaluated up to 7 times (4 for the currently</span>
<a name="l00324"></a>00324 <span class="comment"> * assigned Unicode range). With a memory buffer</span>
<a name="l00325"></a>00325 <span class="comment"> * input, this could be *ptr++.</span>
<a name="l00326"></a>00326 <span class="comment"> * @param ERROR Expression to be evaluated on invalid input,</span>
<a name="l00327"></a>00327 <span class="comment"> * typically a goto statement.</span>
<a name="l00328"></a>00328 <span class="comment"> *</span>
<a name="l00329"></a>00329 <span class="comment"> * @warning ERROR should not contain a loop control statement which</span>
<a name="l00330"></a>00330 <span class="comment"> * could interact with the internal while loop, and should force an</span>
<a name="l00331"></a>00331 <span class="comment"> * exit from the macro code (e.g. through a goto or a return) in order</span>
<a name="l00332"></a>00332 <span class="comment"> * to prevent undefined results.</span>
<a name="l00333"></a>00333 <span class="comment"> */</span>
<a name="l00334"></a><a class="code" href="common_8h.html#a1a2fd8cd42afb00c9f69562f52b1ae4b">00334</a> <span class="preprocessor">#define GET_UTF8(val, GET_BYTE, ERROR)\</span>
<a name="l00335"></a>00335 <span class="preprocessor"> val= GET_BYTE;\</span>
<a name="l00336"></a>00336 <span class="preprocessor"> {\</span>
<a name="l00337"></a>00337 <span class="preprocessor"> uint32_t top = (val & 128) >> 1;\</span>
<a name="l00338"></a>00338 <span class="preprocessor"> if ((val & 0xc0) == 0x80 || val >= 0xFE)\</span>
<a name="l00339"></a>00339 <span class="preprocessor"> ERROR\</span>
<a name="l00340"></a>00340 <span class="preprocessor"> while (val & top) {\</span>
<a name="l00341"></a>00341 <span class="preprocessor"> int tmp= GET_BYTE - 128;\</span>
<a name="l00342"></a>00342 <span class="preprocessor"> if(tmp>>6)\</span>
<a name="l00343"></a>00343 <span class="preprocessor"> ERROR\</span>
<a name="l00344"></a>00344 <span class="preprocessor"> val= (val<<6) + tmp;\</span>
<a name="l00345"></a>00345 <span class="preprocessor"> top <<= 5;\</span>
<a name="l00346"></a>00346 <span class="preprocessor"> }\</span>
<a name="l00347"></a>00347 <span class="preprocessor"> val &= (top << 1) - 1;\</span>
<a name="l00348"></a>00348 <span class="preprocessor"> }</span>
<a name="l00349"></a>00349 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00350"></a>00350 <span class="comment">/**</span>
<a name="l00351"></a>00351 <span class="comment"> * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.</span>
<a name="l00352"></a>00352 <span class="comment"> *</span>
<a name="l00353"></a>00353 <span class="comment"> * @param val Output value, must be an lvalue of type uint32_t.</span>
<a name="l00354"></a>00354 <span class="comment"> * @param GET_16BIT Expression returning two bytes of UTF-16 data converted</span>
<a name="l00355"></a>00355 <span class="comment"> * to native byte order. Evaluated one or two times.</span>
<a name="l00356"></a>00356 <span class="comment"> * @param ERROR Expression to be evaluated on invalid input,</span>
<a name="l00357"></a>00357 <span class="comment"> * typically a goto statement.</span>
<a name="l00358"></a>00358 <span class="comment"> */</span>
<a name="l00359"></a><a class="code" href="common_8h.html#a2665137b6cc64bb5cf491ba9f9dbd215">00359</a> <span class="preprocessor">#define GET_UTF16(val, GET_16BIT, ERROR)\</span>
<a name="l00360"></a>00360 <span class="preprocessor"> val = GET_16BIT;\</span>
<a name="l00361"></a>00361 <span class="preprocessor"> {\</span>
<a name="l00362"></a>00362 <span class="preprocessor"> unsigned int hi = val - 0xD800;\</span>
<a name="l00363"></a>00363 <span class="preprocessor"> if (hi < 0x800) {\</span>
<a name="l00364"></a>00364 <span class="preprocessor"> val = GET_16BIT - 0xDC00;\</span>
<a name="l00365"></a>00365 <span class="preprocessor"> if (val > 0x3FFU || hi > 0x3FFU)\</span>
<a name="l00366"></a>00366 <span class="preprocessor"> ERROR\</span>
<a name="l00367"></a>00367 <span class="preprocessor"> val += (hi<<10) + 0x10000;\</span>
<a name="l00368"></a>00368 <span class="preprocessor"> }\</span>
<a name="l00369"></a>00369 <span class="preprocessor"> }\</span>
<a name="l00370"></a>00370 <span class="preprocessor"></span>
<a name="l00371"></a>00371 <span class="preprocessor"></span><span class="comment">/**</span>
<a name="l00372"></a>00372 <span class="comment"> * @def PUT_UTF8(val, tmp, PUT_BYTE)</span>
<a name="l00373"></a>00373 <span class="comment"> * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).</span>
<a name="l00374"></a>00374 <span class="comment"> * @param val is an input-only argument and should be of type uint32_t. It holds</span>
<a name="l00375"></a>00375 <span class="comment"> * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If</span>
<a name="l00376"></a>00376 <span class="comment"> * val is given as a function it is executed only once.</span>
<a name="l00377"></a>00377 <span class="comment"> * @param tmp is a temporary variable and should be of type uint8_t. It</span>
<a name="l00378"></a>00378 <span class="comment"> * represents an intermediate value during conversion that is to be</span>
<a name="l00379"></a>00379 <span class="comment"> * output by PUT_BYTE.</span>
<a name="l00380"></a>00380 <span class="comment"> * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.</span>
<a name="l00381"></a>00381 <span class="comment"> * It could be a function or a statement, and uses tmp as the input byte.</span>
<a name="l00382"></a>00382 <span class="comment"> * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be</span>
<a name="l00383"></a>00383 <span class="comment"> * executed up to 4 times for values in the valid UTF-8 range and up to</span>
<a name="l00384"></a>00384 <span class="comment"> * 7 times in the general case, depending on the length of the converted</span>
<a name="l00385"></a>00385 <span class="comment"> * Unicode character.</span>
<a name="l00386"></a>00386 <span class="comment"> */</span>
<a name="l00387"></a><a class="code" href="common_8h.html#ac6a994fe28410a8d14f70f0992db4f42">00387</a> <span class="preprocessor">#define PUT_UTF8(val, tmp, PUT_BYTE)\</span>
<a name="l00388"></a>00388 <span class="preprocessor"> {\</span>
<a name="l00389"></a>00389 <span class="preprocessor"> int bytes, shift;\</span>
<a name="l00390"></a>00390 <span class="preprocessor"> uint32_t in = val;\</span>
<a name="l00391"></a>00391 <span class="preprocessor"> if (in < 0x80) {\</span>
<a name="l00392"></a>00392 <span class="preprocessor"> tmp = in;\</span>
<a name="l00393"></a>00393 <span class="preprocessor"> PUT_BYTE\</span>
<a name="l00394"></a>00394 <span class="preprocessor"> } else {\</span>
<a name="l00395"></a>00395 <span class="preprocessor"> bytes = (av_log2(in) + 4) / 5;\</span>
<a name="l00396"></a>00396 <span class="preprocessor"> shift = (bytes - 1) * 6;\</span>
<a name="l00397"></a>00397 <span class="preprocessor"> tmp = (256 - (256 >> bytes)) | (in >> shift);\</span>
<a name="l00398"></a>00398 <span class="preprocessor"> PUT_BYTE\</span>
<a name="l00399"></a>00399 <span class="preprocessor"> while (shift >= 6) {\</span>
<a name="l00400"></a>00400 <span class="preprocessor"> shift -= 6;\</span>
<a name="l00401"></a>00401 <span class="preprocessor"> tmp = 0x80 | ((in >> shift) & 0x3f);\</span>
<a name="l00402"></a>00402 <span class="preprocessor"> PUT_BYTE\</span>
<a name="l00403"></a>00403 <span class="preprocessor"> }\</span>
<a name="l00404"></a>00404 <span class="preprocessor"> }\</span>
<a name="l00405"></a>00405 <span class="preprocessor"> }</span>
<a name="l00406"></a>00406 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00407"></a>00407 <span class="comment">/**</span>
<a name="l00408"></a>00408 <span class="comment"> * @def PUT_UTF16(val, tmp, PUT_16BIT)</span>
<a name="l00409"></a>00409 <span class="comment"> * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).</span>
<a name="l00410"></a>00410 <span class="comment"> * @param val is an input-only argument and should be of type uint32_t. It holds</span>
<a name="l00411"></a>00411 <span class="comment"> * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If</span>
<a name="l00412"></a>00412 <span class="comment"> * val is given as a function it is executed only once.</span>
<a name="l00413"></a>00413 <span class="comment"> * @param tmp is a temporary variable and should be of type uint16_t. It</span>
<a name="l00414"></a>00414 <span class="comment"> * represents an intermediate value during conversion that is to be</span>
<a name="l00415"></a>00415 <span class="comment"> * output by PUT_16BIT.</span>
<a name="l00416"></a>00416 <span class="comment"> * @param PUT_16BIT writes the converted UTF-16 data to any proper destination</span>
<a name="l00417"></a>00417 <span class="comment"> * in desired endianness. It could be a function or a statement, and uses tmp</span>
<a name="l00418"></a>00418 <span class="comment"> * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"</span>
<a name="l00419"></a>00419 <span class="comment"> * PUT_BYTE will be executed 1 or 2 times depending on input character.</span>
<a name="l00420"></a>00420 <span class="comment"> */</span>
<a name="l00421"></a><a class="code" href="common_8h.html#a6486c4a216b16b4d2615c23d8429cd6b">00421</a> <span class="preprocessor">#define PUT_UTF16(val, tmp, PUT_16BIT)\</span>
<a name="l00422"></a>00422 <span class="preprocessor"> {\</span>
<a name="l00423"></a>00423 <span class="preprocessor"> uint32_t in = val;\</span>
<a name="l00424"></a>00424 <span class="preprocessor"> if (in < 0x10000) {\</span>
<a name="l00425"></a>00425 <span class="preprocessor"> tmp = in;\</span>
<a name="l00426"></a>00426 <span class="preprocessor"> PUT_16BIT\</span>
<a name="l00427"></a>00427 <span class="preprocessor"> } else {\</span>
<a name="l00428"></a>00428 <span class="preprocessor"> tmp = 0xD800 | ((in - 0x10000) >> 10);\</span>
<a name="l00429"></a>00429 <span class="preprocessor"> PUT_16BIT\</span>
<a name="l00430"></a>00430 <span class="preprocessor"> tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\</span>
<a name="l00431"></a>00431 <span class="preprocessor"> PUT_16BIT\</span>
<a name="l00432"></a>00432 <span class="preprocessor"> }\</span>
<a name="l00433"></a>00433 <span class="preprocessor"> }\</span>
<a name="l00434"></a>00434 <span class="preprocessor"></span>
<a name="l00435"></a>00435 <span class="preprocessor"></span>
<a name="l00436"></a>00436
<a name="l00437"></a>00437 <span class="preprocessor">#include "<a class="code" href="mem_8h.html" title="memory handling functions">mem.h</a>"</span>
<a name="l00438"></a>00438
<a name="l00439"></a>00439 <span class="preprocessor">#ifdef HAVE_AV_CONFIG_H</span>
<a name="l00440"></a>00440 <span class="preprocessor"></span><span class="preprocessor"># include "internal.h"</span>
<a name="l00441"></a>00441 <span class="preprocessor">#endif </span><span class="comment">/* HAVE_AV_CONFIG_H */</span>
<a name="l00442"></a>00442
<a name="l00443"></a>00443 <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_COMMON_H */</span>
<a name="l00444"></a>00444
<a name="l00445"></a>00445 <span class="comment">/*</span>
<a name="l00446"></a>00446 <span class="comment"> * The following definitions are outside the multiple inclusion guard</span>
<a name="l00447"></a>00447 <span class="comment"> * to ensure they are immediately available in intmath.h.</span>
<a name="l00448"></a>00448 <span class="comment"> */</span>
<a name="l00449"></a>00449
<a name="l00450"></a>00450 <span class="preprocessor">#ifndef av_ceil_log2</span>
<a name="l00451"></a>00451 <span class="preprocessor"></span><span class="preprocessor"># define av_ceil_log2 av_ceil_log2_c</span>
<a name="l00452"></a>00452 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00453"></a>00453 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip</span>
<a name="l00454"></a>00454 <span class="preprocessor"></span><span class="preprocessor"># define av_clip av_clip_c</span>
<a name="l00455"></a>00455 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00456"></a>00456 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip64</span>
<a name="l00457"></a>00457 <span class="preprocessor"></span><span class="preprocessor"># define av_clip64 av_clip64_c</span>
<a name="l00458"></a>00458 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00459"></a>00459 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip_uint8</span>
<a name="l00460"></a>00460 <span class="preprocessor"></span><span class="preprocessor"># define av_clip_uint8 av_clip_uint8_c</span>
<a name="l00461"></a>00461 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00462"></a>00462 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip_int8</span>
<a name="l00463"></a>00463 <span class="preprocessor"></span><span class="preprocessor"># define av_clip_int8 av_clip_int8_c</span>
<a name="l00464"></a>00464 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00465"></a>00465 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip_uint16</span>
<a name="l00466"></a>00466 <span class="preprocessor"></span><span class="preprocessor"># define av_clip_uint16 av_clip_uint16_c</span>
<a name="l00467"></a>00467 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00468"></a>00468 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip_int16</span>
<a name="l00469"></a>00469 <span class="preprocessor"></span><span class="preprocessor"># define av_clip_int16 av_clip_int16_c</span>
<a name="l00470"></a>00470 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00471"></a>00471 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clipl_int32</span>
<a name="l00472"></a>00472 <span class="preprocessor"></span><span class="preprocessor"># define av_clipl_int32 av_clipl_int32_c</span>
<a name="l00473"></a>00473 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00474"></a>00474 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip_intp2</span>
<a name="l00475"></a>00475 <span class="preprocessor"></span><span class="preprocessor"># define av_clip_intp2 av_clip_intp2_c</span>
<a name="l00476"></a>00476 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00477"></a>00477 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clip_uintp2</span>
<a name="l00478"></a>00478 <span class="preprocessor"></span><span class="preprocessor"># define av_clip_uintp2 av_clip_uintp2_c</span>
<a name="l00479"></a>00479 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00480"></a>00480 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_mod_uintp2</span>
<a name="l00481"></a>00481 <span class="preprocessor"></span><span class="preprocessor"># define av_mod_uintp2 av_mod_uintp2_c</span>
<a name="l00482"></a>00482 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00483"></a>00483 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_sat_add32</span>
<a name="l00484"></a>00484 <span class="preprocessor"></span><span class="preprocessor"># define av_sat_add32 av_sat_add32_c</span>
<a name="l00485"></a>00485 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00486"></a>00486 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_sat_dadd32</span>
<a name="l00487"></a>00487 <span class="preprocessor"></span><span class="preprocessor"># define av_sat_dadd32 av_sat_dadd32_c</span>
<a name="l00488"></a>00488 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00489"></a>00489 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clipf</span>
<a name="l00490"></a>00490 <span class="preprocessor"></span><span class="preprocessor"># define av_clipf av_clipf_c</span>
<a name="l00491"></a>00491 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00492"></a>00492 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_clipd</span>
<a name="l00493"></a>00493 <span class="preprocessor"></span><span class="preprocessor"># define av_clipd av_clipd_c</span>
<a name="l00494"></a>00494 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00495"></a>00495 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_popcount</span>
<a name="l00496"></a>00496 <span class="preprocessor"></span><span class="preprocessor"># define av_popcount av_popcount_c</span>
<a name="l00497"></a>00497 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00498"></a>00498 <span class="preprocessor"></span><span class="preprocessor">#ifndef av_popcount64</span>
<a name="l00499"></a>00499 <span class="preprocessor"></span><span class="preprocessor"># define av_popcount64 av_popcount64_c</span>
<a name="l00500"></a>00500 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
</pre></div></div><!-- contents -->
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