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<a href="mem_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"> * memory handling functions</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_MEM_H</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_MEM_H</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <limits.h></span>
<a name="l00030"></a>00030 <span class="preprocessor">#include <stdint.h></span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <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="l00033"></a>00033 <span class="preprocessor">#include "<a class="code" href="error_8h.html" title="error code definitions">error.h</a>"</span>
<a name="l00034"></a>00034 <span class="preprocessor">#include "<a class="code" href="avutil_8h.html" title="external API header">avutil.h</a>"</span>
<a name="l00035"></a>00035 <span class="comment"></span>
<a name="l00036"></a>00036 <span class="comment">/**</span>
<a name="l00037"></a>00037 <span class="comment"> * @addtogroup lavu_mem</span>
<a name="l00038"></a>00038 <span class="comment"> * @{</span>
<a name="l00039"></a>00039 <span class="comment"> */</span>
<a name="l00040"></a>00040
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="preprocessor">#if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span><span class="preprocessor">#elif defined(__TI_COMPILER_VERSION__)</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ALIGNED(n,t,v) \</span>
<a name="l00047"></a>00047 <span class="preprocessor"> AV_PRAGMA(DATA_ALIGN(v,n)) \</span>
<a name="l00048"></a>00048 <span class="preprocessor"> t __attribute__((aligned(n))) v</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ASM_CONST(n,t,v) \</span>
<a name="l00050"></a>00050 <span class="preprocessor"> AV_PRAGMA(DATA_ALIGN(v,n)) \</span>
<a name="l00051"></a>00051 <span class="preprocessor"> static const t __attribute__((aligned(n))) v</span>
<a name="l00052"></a>00052 <span class="preprocessor"></span><span class="preprocessor">#elif defined(__GNUC__)</span>
<a name="l00053"></a><a class="code" href="group__lavu__mem.html#ga7a422611f83afb33d6e0da44184b548e">00053</a> <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v</span>
<a name="l00054"></a><a class="code" href="group__lavu__mem.html#ga6e5cdd0ac639d7dea5033df3b64cfe3c">00054</a> <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v</span>
<a name="l00055"></a>00055 <span class="preprocessor"></span><span class="preprocessor">#elif defined(_MSC_VER)</span>
<a name="l00056"></a>00056 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v</span>
<a name="l00057"></a>00057 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v</span>
<a name="l00058"></a>00058 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00059"></a>00059 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ALIGNED(n,t,v) t v</span>
<a name="l00060"></a>00060 <span class="preprocessor"></span><span class="preprocessor"> #define DECLARE_ASM_CONST(n,t,v) static const t v</span>
<a name="l00061"></a>00061 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00062"></a>00062 <span class="preprocessor"></span>
<a name="l00063"></a>00063 <span class="preprocessor">#if AV_GCC_VERSION_AT_LEAST(3,1)</span>
<a name="l00064"></a><a class="code" href="group__lavu__mem.html#gad48ff724186ef4e602ae7a2547e4287c">00064</a> <span class="preprocessor"></span><span class="preprocessor"> #define av_malloc_attrib __attribute__((__malloc__))</span>
<a name="l00065"></a>00065 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00066"></a>00066 <span class="preprocessor"></span><span class="preprocessor"> #define av_malloc_attrib</span>
<a name="l00067"></a>00067 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00068"></a>00068 <span class="preprocessor"></span>
<a name="l00069"></a>00069 <span class="preprocessor">#if AV_GCC_VERSION_AT_LEAST(4,3)</span>
<a name="l00070"></a><a class="code" href="group__lavu__mem.html#gad7ff928d462d1a61b37baa70bf13e0e3">00070</a> <span class="preprocessor"></span><span class="preprocessor"> #define av_alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))</span>
<a name="l00071"></a>00071 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00072"></a>00072 <span class="preprocessor"></span><span class="preprocessor"> #define av_alloc_size(...)</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00075"></a>00075 <span class="comment">/**</span>
<a name="l00076"></a>00076 <span class="comment"> * Allocate a block of size bytes with alignment suitable for all</span>
<a name="l00077"></a>00077 <span class="comment"> * memory accesses (including vectors if available on the CPU).</span>
<a name="l00078"></a>00078 <span class="comment"> * @param size Size in bytes for the memory block to be allocated.</span>
<a name="l00079"></a>00079 <span class="comment"> * @return Pointer to the allocated block, NULL if the block cannot</span>
<a name="l00080"></a>00080 <span class="comment"> * be allocated.</span>
<a name="l00081"></a>00081 <span class="comment"> * @see av_mallocz()</span>
<a name="l00082"></a>00082 <span class="comment"> */</span>
<a name="l00083"></a>00083 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#ga9722446c5e310ffedfaac9489864796d" title="Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...">av_malloc</a>(<span class="keywordtype">size_t</span> size) <a class="code" href="group__lavu__mem.html#gad48ff724186ef4e602ae7a2547e4287c">av_malloc_attrib</a> <a class="code" href="group__lavu__mem.html#gad7ff928d462d1a61b37baa70bf13e0e3">av_alloc_size</a>(1);
<a name="l00084"></a>00084 <span class="comment"></span>
<a name="l00085"></a>00085 <span class="comment">/**</span>
<a name="l00086"></a>00086 <span class="comment"> * Allocate a block of size * nmemb bytes with av_malloc().</span>
<a name="l00087"></a>00087 <span class="comment"> * @param nmemb Number of elements</span>
<a name="l00088"></a>00088 <span class="comment"> * @param size Size of the single element</span>
<a name="l00089"></a>00089 <span class="comment"> * @return Pointer to the allocated block, NULL if the block cannot</span>
<a name="l00090"></a>00090 <span class="comment"> * be allocated.</span>
<a name="l00091"></a>00091 <span class="comment"> * @see av_malloc()</span>
<a name="l00092"></a>00092 <span class="comment"> */</span>
<a name="l00093"></a><a class="code" href="group__lavu__mem.html#gab62b093b46dce5fe4e3e1d58bdb255da">00093</a> <a class="code" href="group__lavu__mem.html#gad7ff928d462d1a61b37baa70bf13e0e3">av_alloc_size</a>(1, 2) static inline <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#gab62b093b46dce5fe4e3e1d58bdb255da">av_malloc_array</a>(<span class="keywordtype">size_t</span> nmemb, <span class="keywordtype">size_t</span> size)
<a name="l00094"></a>00094 {
<a name="l00095"></a>00095 <span class="keywordflow">if</span> (!size || nmemb >= INT_MAX / size)
<a name="l00096"></a>00096 <span class="keywordflow">return</span> NULL;
<a name="l00097"></a>00097 <span class="keywordflow">return</span> <a class="code" href="group__lavu__mem.html#ga9722446c5e310ffedfaac9489864796d" title="Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...">av_malloc</a>(nmemb * size);
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099 <span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment">/**</span>
<a name="l00101"></a>00101 <span class="comment"> * Allocate or reallocate a block of memory.</span>
<a name="l00102"></a>00102 <span class="comment"> * If ptr is NULL and size > 0, allocate a new block. If</span>
<a name="l00103"></a>00103 <span class="comment"> * size is zero, free the memory block pointed to by ptr.</span>
<a name="l00104"></a>00104 <span class="comment"> * @param ptr Pointer to a memory block already allocated with</span>
<a name="l00105"></a>00105 <span class="comment"> * av_realloc() or NULL.</span>
<a name="l00106"></a>00106 <span class="comment"> * @param size Size in bytes of the memory block to be allocated or</span>
<a name="l00107"></a>00107 <span class="comment"> * reallocated.</span>
<a name="l00108"></a>00108 <span class="comment"> * @return Pointer to a newly-reallocated block or NULL if the block</span>
<a name="l00109"></a>00109 <span class="comment"> * cannot be reallocated or the function is used to free the memory block.</span>
<a name="l00110"></a>00110 <span class="comment"> * @warning Pointers originating from the av_malloc() family of functions must</span>
<a name="l00111"></a>00111 <span class="comment"> * not be passed to av_realloc(). The former can be implemented using</span>
<a name="l00112"></a>00112 <span class="comment"> * memalign() (or other functions), and there is no guarantee that</span>
<a name="l00113"></a>00113 <span class="comment"> * pointers from such functions can be passed to realloc() at all.</span>
<a name="l00114"></a>00114 <span class="comment"> * The situation is undefined according to POSIX and may crash with</span>
<a name="l00115"></a>00115 <span class="comment"> * some libc implementations.</span>
<a name="l00116"></a>00116 <span class="comment"> * @see av_fast_realloc()</span>
<a name="l00117"></a>00117 <span class="comment"> */</span>
<a name="l00118"></a>00118 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#ga675a8e3b2f7353329b79a3c55010d612" title="Allocate or reallocate a block of memory.">av_realloc</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> size) <a class="code" href="group__lavu__mem.html#gad7ff928d462d1a61b37baa70bf13e0e3">av_alloc_size</a>(2);
<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"> * Allocate or reallocate a block of memory.</span>
<a name="l00122"></a>00122 <span class="comment"> * This function does the same thing as av_realloc, except:</span>
<a name="l00123"></a>00123 <span class="comment"> * - It takes two arguments and checks the result of the multiplication for</span>
<a name="l00124"></a>00124 <span class="comment"> * integer overflow.</span>
<a name="l00125"></a>00125 <span class="comment"> * - It frees the input block in case of failure, thus avoiding the memory</span>
<a name="l00126"></a>00126 <span class="comment"> * leak with the classic "buf = realloc(buf); if (!buf) return -1;".</span>
<a name="l00127"></a>00127 <span class="comment"> */</span>
<a name="l00128"></a>00128 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#gae5ca394e7536fcd2689008b011a211ad" title="Allocate or reallocate a block of memory.">av_realloc_f</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> nelem, <span class="keywordtype">size_t</span> elsize);
<a name="l00129"></a>00129 <span class="comment"></span>
<a name="l00130"></a>00130 <span class="comment">/**</span>
<a name="l00131"></a>00131 <span class="comment"> * Allocate or reallocate a block of memory.</span>
<a name="l00132"></a>00132 <span class="comment"> * If *ptr is NULL and size > 0, allocate a new block. If</span>
<a name="l00133"></a>00133 <span class="comment"> * size is zero, free the memory block pointed to by ptr.</span>
<a name="l00134"></a>00134 <span class="comment"> * @param ptr Pointer to a pointer to a memory block already allocated</span>
<a name="l00135"></a>00135 <span class="comment"> * with av_realloc(), or pointer to a pointer to NULL.</span>
<a name="l00136"></a>00136 <span class="comment"> * The pointer is updated on success, or freed on failure.</span>
<a name="l00137"></a>00137 <span class="comment"> * @param size Size in bytes for the memory block to be allocated or</span>
<a name="l00138"></a>00138 <span class="comment"> * reallocated</span>
<a name="l00139"></a>00139 <span class="comment"> * @return Zero on success, an AVERROR error code on failure.</span>
<a name="l00140"></a>00140 <span class="comment"> * @warning Pointers originating from the av_malloc() family of functions must</span>
<a name="l00141"></a>00141 <span class="comment"> * not be passed to av_reallocp(). The former can be implemented using</span>
<a name="l00142"></a>00142 <span class="comment"> * memalign() (or other functions), and there is no guarantee that</span>
<a name="l00143"></a>00143 <span class="comment"> * pointers from such functions can be passed to realloc() at all.</span>
<a name="l00144"></a>00144 <span class="comment"> * The situation is undefined according to POSIX and may crash with</span>
<a name="l00145"></a>00145 <span class="comment"> * some libc implementations.</span>
<a name="l00146"></a>00146 <span class="comment"> */</span>
<a name="l00147"></a>00147 <span class="keywordtype">int</span> <a class="code" href="group__lavu__mem.html#ga162ac7cb3ff79ae050ccc25e57adfc46" title="Allocate or reallocate a block of memory.">av_reallocp</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> size);
<a name="l00148"></a>00148 <span class="comment"></span>
<a name="l00149"></a>00149 <span class="comment">/**</span>
<a name="l00150"></a>00150 <span class="comment"> * Allocate or reallocate an array.</span>
<a name="l00151"></a>00151 <span class="comment"> * If ptr is NULL and nmemb > 0, allocate a new block. If</span>
<a name="l00152"></a>00152 <span class="comment"> * nmemb is zero, free the memory block pointed to by ptr.</span>
<a name="l00153"></a>00153 <span class="comment"> * @param ptr Pointer to a memory block already allocated with</span>
<a name="l00154"></a>00154 <span class="comment"> * av_realloc() or NULL.</span>
<a name="l00155"></a>00155 <span class="comment"> * @param nmemb Number of elements</span>
<a name="l00156"></a>00156 <span class="comment"> * @param size Size of the single element</span>
<a name="l00157"></a>00157 <span class="comment"> * @return Pointer to a newly-reallocated block or NULL if the block</span>
<a name="l00158"></a>00158 <span class="comment"> * cannot be reallocated or the function is used to free the memory block.</span>
<a name="l00159"></a>00159 <span class="comment"> * @warning Pointers originating from the av_malloc() family of functions must</span>
<a name="l00160"></a>00160 <span class="comment"> * not be passed to av_realloc(). The former can be implemented using</span>
<a name="l00161"></a>00161 <span class="comment"> * memalign() (or other functions), and there is no guarantee that</span>
<a name="l00162"></a>00162 <span class="comment"> * pointers from such functions can be passed to realloc() at all.</span>
<a name="l00163"></a>00163 <span class="comment"> * The situation is undefined according to POSIX and may crash with</span>
<a name="l00164"></a>00164 <span class="comment"> * some libc implementations.</span>
<a name="l00165"></a>00165 <span class="comment"> */</span>
<a name="l00166"></a>00166 <a class="code" href="group__lavu__mem.html#gad7ff928d462d1a61b37baa70bf13e0e3">av_alloc_size</a>(2, 3) void *<a class="code" href="group__lavu__mem.html#gaadc230ece36ef112710b262a6601a16b">av_realloc_array</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> nmemb, <span class="keywordtype">size_t</span> size);
<a name="l00167"></a>00167 <span class="comment"></span>
<a name="l00168"></a>00168 <span class="comment">/**</span>
<a name="l00169"></a>00169 <span class="comment"> * Allocate or reallocate an array through a pointer to a pointer.</span>
<a name="l00170"></a>00170 <span class="comment"> * If *ptr is NULL and nmemb > 0, allocate a new block. If</span>
<a name="l00171"></a>00171 <span class="comment"> * nmemb is zero, free the memory block pointed to by ptr.</span>
<a name="l00172"></a>00172 <span class="comment"> * @param ptr Pointer to a pointer to a memory block already allocated</span>
<a name="l00173"></a>00173 <span class="comment"> * with av_realloc(), or pointer to a pointer to NULL.</span>
<a name="l00174"></a>00174 <span class="comment"> * The pointer is updated on success, or freed on failure.</span>
<a name="l00175"></a>00175 <span class="comment"> * @param nmemb Number of elements</span>
<a name="l00176"></a>00176 <span class="comment"> * @param size Size of the single element</span>
<a name="l00177"></a>00177 <span class="comment"> * @return Zero on success, an AVERROR error code on failure.</span>
<a name="l00178"></a>00178 <span class="comment"> * @warning Pointers originating from the av_malloc() family of functions must</span>
<a name="l00179"></a>00179 <span class="comment"> * not be passed to av_realloc(). The former can be implemented using</span>
<a name="l00180"></a>00180 <span class="comment"> * memalign() (or other functions), and there is no guarantee that</span>
<a name="l00181"></a>00181 <span class="comment"> * pointers from such functions can be passed to realloc() at all.</span>
<a name="l00182"></a>00182 <span class="comment"> * The situation is undefined according to POSIX and may crash with</span>
<a name="l00183"></a>00183 <span class="comment"> * some libc implementations.</span>
<a name="l00184"></a>00184 <span class="comment"> */</span>
<a name="l00185"></a>00185 <a class="code" href="group__lavu__mem.html#gad7ff928d462d1a61b37baa70bf13e0e3">av_alloc_size</a>(2, 3) <span class="keywordtype">int</span> <a class="code" href="group__lavu__mem.html#gad8fde0c159ac905909339e082a049cde">av_reallocp_array</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> nmemb, <span class="keywordtype">size_t</span> size);
<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"> * Free a memory block which has been allocated with av_malloc(z)() or</span>
<a name="l00189"></a>00189 <span class="comment"> * av_realloc().</span>
<a name="l00190"></a>00190 <span class="comment"> * @param ptr Pointer to the memory block which should be freed.</span>
<a name="l00191"></a>00191 <span class="comment"> * @note ptr = NULL is explicitly allowed.</span>
<a name="l00192"></a>00192 <span class="comment"> * @note It is recommended that you use av_freep() instead.</span>
<a name="l00193"></a>00193 <span class="comment"> * @see av_freep()</span>
<a name="l00194"></a>00194 <span class="comment"> */</span>
<a name="l00195"></a>00195 <span class="keywordtype">void</span> <a class="code" href="group__lavu__mem.html#ga0c9096f498624c525aa2315b8a20c411" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc().">av_free</a>(<span class="keywordtype">void</span> *ptr);
<a name="l00196"></a>00196 <span class="comment"></span>
<a name="l00197"></a>00197 <span class="comment">/**</span>
<a name="l00198"></a>00198 <span class="comment"> * Allocate a block of size bytes with alignment suitable for all</span>
<a name="l00199"></a>00199 <span class="comment"> * memory accesses (including vectors if available on the CPU) and</span>
<a name="l00200"></a>00200 <span class="comment"> * zero all the bytes of the block.</span>
<a name="l00201"></a>00201 <span class="comment"> * @param size Size in bytes for the memory block to be allocated.</span>
<a name="l00202"></a>00202 <span class="comment"> * @return Pointer to the allocated block, NULL if it cannot be allocated.</span>
<a name="l00203"></a>00203 <span class="comment"> * @see av_malloc()</span>
<a name="l00204"></a>00204 <span class="comment"> */</span>
<a name="l00205"></a>00205 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#ga0a8cc057ae9723ce3b9203cb5365971a" title="Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...">av_mallocz</a>(<span class="keywordtype">size_t</span> size) <a class="code" href="group__lavu__mem.html#gad48ff724186ef4e602ae7a2547e4287c">av_malloc_attrib</a> <a class="code" href="group__lavu__mem.html#gad7ff928d462d1a61b37baa70bf13e0e3">av_alloc_size</a>(1);
<a name="l00206"></a>00206 <span class="comment"></span>
<a name="l00207"></a>00207 <span class="comment">/**</span>
<a name="l00208"></a>00208 <span class="comment"> * Allocate a block of nmemb * size bytes with alignment suitable for all</span>
<a name="l00209"></a>00209 <span class="comment"> * memory accesses (including vectors if available on the CPU) and</span>
<a name="l00210"></a>00210 <span class="comment"> * zero all the bytes of the block.</span>
<a name="l00211"></a>00211 <span class="comment"> * The allocation will fail if nmemb * size is greater than or equal</span>
<a name="l00212"></a>00212 <span class="comment"> * to INT_MAX.</span>
<a name="l00213"></a>00213 <span class="comment"> * @param nmemb</span>
<a name="l00214"></a>00214 <span class="comment"> * @param size</span>
<a name="l00215"></a>00215 <span class="comment"> * @return Pointer to the allocated block, NULL if it cannot be allocated.</span>
<a name="l00216"></a>00216 <span class="comment"> */</span>
<a name="l00217"></a>00217 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#gaaf38f6d994f5a85854ef47fd98fa6e9a" title="Allocate a block of nmemb * size bytes with alignment suitable for all memory accesses (including vec...">av_calloc</a>(<span class="keywordtype">size_t</span> nmemb, <span class="keywordtype">size_t</span> size) <a class="code" href="group__lavu__mem.html#gad48ff724186ef4e602ae7a2547e4287c">av_malloc_attrib</a>;
<a name="l00218"></a>00218 <span class="comment"></span>
<a name="l00219"></a>00219 <span class="comment">/**</span>
<a name="l00220"></a>00220 <span class="comment"> * Allocate a block of size * nmemb bytes with av_mallocz().</span>
<a name="l00221"></a>00221 <span class="comment"> * @param nmemb Number of elements</span>
<a name="l00222"></a>00222 <span class="comment"> * @param size Size of the single element</span>
<a name="l00223"></a>00223 <span class="comment"> * @return Pointer to the allocated block, NULL if the block cannot</span>
<a name="l00224"></a>00224 <span class="comment"> * be allocated.</span>
<a name="l00225"></a>00225 <span class="comment"> * @see av_mallocz()</span>
<a name="l00226"></a>00226 <span class="comment"> * @see av_malloc_array()</span>
<a name="l00227"></a>00227 <span class="comment"> */</span>
<a name="l00228"></a><a class="code" href="group__lavu__mem.html#gae0443f550815c80af42c5ae967351433">00228</a> av_alloc_size(1, 2) static inline <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#gae0443f550815c80af42c5ae967351433">av_mallocz_array</a>(<span class="keywordtype">size_t</span> nmemb, <span class="keywordtype">size_t</span> size)
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230 <span class="keywordflow">if</span> (!size || nmemb >= INT_MAX / size)
<a name="l00231"></a>00231 <span class="keywordflow">return</span> NULL;
<a name="l00232"></a>00232 <span class="keywordflow">return</span> <a class="code" href="group__lavu__mem.html#ga0a8cc057ae9723ce3b9203cb5365971a" title="Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...">av_mallocz</a>(nmemb * size);
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234 <span class="comment"></span>
<a name="l00235"></a>00235 <span class="comment">/**</span>
<a name="l00236"></a>00236 <span class="comment"> * Duplicate the string s.</span>
<a name="l00237"></a>00237 <span class="comment"> * @param s string to be duplicated</span>
<a name="l00238"></a>00238 <span class="comment"> * @return Pointer to a newly-allocated string containing a</span>
<a name="l00239"></a>00239 <span class="comment"> * copy of s or NULL if the string cannot be allocated.</span>
<a name="l00240"></a>00240 <span class="comment"> */</span>
<a name="l00241"></a>00241 <span class="keywordtype">char</span> *<a class="code" href="group__lavu__mem.html#ga7c352f4cff02184f005323691375fea9" title="Duplicate the string s.">av_strdup</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *s) <a class="code" href="group__lavu__mem.html#gad48ff724186ef4e602ae7a2547e4287c">av_malloc_attrib</a>;
<a name="l00242"></a>00242 <span class="comment"></span>
<a name="l00243"></a>00243 <span class="comment">/**</span>
<a name="l00244"></a>00244 <span class="comment"> * Duplicate a substring of the string s.</span>
<a name="l00245"></a>00245 <span class="comment"> * @param s string to be duplicated</span>
<a name="l00246"></a>00246 <span class="comment"> * @param len the maximum length of the resulting string (not counting the</span>
<a name="l00247"></a>00247 <span class="comment"> * terminating byte).</span>
<a name="l00248"></a>00248 <span class="comment"> * @return Pointer to a newly-allocated string containing a</span>
<a name="l00249"></a>00249 <span class="comment"> * copy of s or NULL if the string cannot be allocated.</span>
<a name="l00250"></a>00250 <span class="comment"> */</span>
<a name="l00251"></a>00251 <span class="keywordtype">char</span> *<a class="code" href="group__lavu__mem.html#gaffde7a717e3a603ed11a998c18d68cad" title="Duplicate a substring of the string s.">av_strndup</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *s, <span class="keywordtype">size_t</span> len) <a class="code" href="group__lavu__mem.html#gad48ff724186ef4e602ae7a2547e4287c">av_malloc_attrib</a>;
<a name="l00252"></a>00252 <span class="comment"></span>
<a name="l00253"></a>00253 <span class="comment">/**</span>
<a name="l00254"></a>00254 <span class="comment"> * Duplicate the buffer p.</span>
<a name="l00255"></a>00255 <span class="comment"> * @param p buffer to be duplicated</span>
<a name="l00256"></a>00256 <span class="comment"> * @return Pointer to a newly allocated buffer containing a</span>
<a name="l00257"></a>00257 <span class="comment"> * copy of p or NULL if the buffer cannot be allocated.</span>
<a name="l00258"></a>00258 <span class="comment"> */</span>
<a name="l00259"></a>00259 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#ga4ad5e6363f4a6b6eddfdb427e21166f2" title="Duplicate the buffer p.">av_memdup</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *p, <span class="keywordtype">size_t</span> size);
<a name="l00260"></a>00260 <span class="comment"></span>
<a name="l00261"></a>00261 <span class="comment">/**</span>
<a name="l00262"></a>00262 <span class="comment"> * Free a memory block which has been allocated with av_malloc(z)() or</span>
<a name="l00263"></a>00263 <span class="comment"> * av_realloc() and set the pointer pointing to it to NULL.</span>
<a name="l00264"></a>00264 <span class="comment"> * @param ptr Pointer to the pointer to the memory block which should</span>
<a name="l00265"></a>00265 <span class="comment"> * be freed.</span>
<a name="l00266"></a>00266 <span class="comment"> * @note passing a pointer to a NULL pointer is safe and leads to no action.</span>
<a name="l00267"></a>00267 <span class="comment"> * @see av_free()</span>
<a name="l00268"></a>00268 <span class="comment"> */</span>
<a name="l00269"></a>00269 <span class="keywordtype">void</span> <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(<span class="keywordtype">void</span> *ptr);
<a name="l00270"></a>00270 <span class="comment"></span>
<a name="l00271"></a>00271 <span class="comment">/**</span>
<a name="l00272"></a>00272 <span class="comment"> * Add an element to a dynamic array.</span>
<a name="l00273"></a>00273 <span class="comment"> *</span>
<a name="l00274"></a>00274 <span class="comment"> * The array to grow is supposed to be an array of pointers to</span>
<a name="l00275"></a>00275 <span class="comment"> * structures, and the element to add must be a pointer to an already</span>
<a name="l00276"></a>00276 <span class="comment"> * allocated structure.</span>
<a name="l00277"></a>00277 <span class="comment"> *</span>
<a name="l00278"></a>00278 <span class="comment"> * The array is reallocated when its size reaches powers of 2.</span>
<a name="l00279"></a>00279 <span class="comment"> * Therefore, the amortized cost of adding an element is constant.</span>
<a name="l00280"></a>00280 <span class="comment"> *</span>
<a name="l00281"></a>00281 <span class="comment"> * In case of success, the pointer to the array is updated in order to</span>
<a name="l00282"></a>00282 <span class="comment"> * point to the new grown array, and the number pointed to by nb_ptr</span>
<a name="l00283"></a>00283 <span class="comment"> * is incremented.</span>
<a name="l00284"></a>00284 <span class="comment"> * In case of failure, the array is freed, *tab_ptr is set to NULL and</span>
<a name="l00285"></a>00285 <span class="comment"> * *nb_ptr is set to 0.</span>
<a name="l00286"></a>00286 <span class="comment"> *</span>
<a name="l00287"></a>00287 <span class="comment"> * @param tab_ptr pointer to the array to grow</span>
<a name="l00288"></a>00288 <span class="comment"> * @param nb_ptr pointer to the number of elements in the array</span>
<a name="l00289"></a>00289 <span class="comment"> * @param elem element to add</span>
<a name="l00290"></a>00290 <span class="comment"> * @see av_dynarray_add_nofree(), av_dynarray2_add()</span>
<a name="l00291"></a>00291 <span class="comment"> */</span>
<a name="l00292"></a>00292 <span class="keywordtype">void</span> <a class="code" href="group__lavu__mem.html#ga385b582522cedf5a88ce2cf158c396c9" title="Add an element to a dynamic array.">av_dynarray_add</a>(<span class="keywordtype">void</span> *tab_ptr, <span class="keywordtype">int</span> *nb_ptr, <span class="keywordtype">void</span> *elem);
<a name="l00293"></a>00293 <span class="comment"></span>
<a name="l00294"></a>00294 <span class="comment">/**</span>
<a name="l00295"></a>00295 <span class="comment"> * Add an element to a dynamic array.</span>
<a name="l00296"></a>00296 <span class="comment"> *</span>
<a name="l00297"></a>00297 <span class="comment"> * Function has the same functionality as av_dynarray_add(),</span>
<a name="l00298"></a>00298 <span class="comment"> * but it doesn't free memory on fails. It returns error code</span>
<a name="l00299"></a>00299 <span class="comment"> * instead and leave current buffer untouched.</span>
<a name="l00300"></a>00300 <span class="comment"> *</span>
<a name="l00301"></a>00301 <span class="comment"> * @param tab_ptr pointer to the array to grow</span>
<a name="l00302"></a>00302 <span class="comment"> * @param nb_ptr pointer to the number of elements in the array</span>
<a name="l00303"></a>00303 <span class="comment"> * @param elem element to add</span>
<a name="l00304"></a>00304 <span class="comment"> * @return >=0 on success, negative otherwise.</span>
<a name="l00305"></a>00305 <span class="comment"> * @see av_dynarray_add(), av_dynarray2_add()</span>
<a name="l00306"></a>00306 <span class="comment"> */</span>
<a name="l00307"></a>00307 <span class="keywordtype">int</span> <a class="code" href="group__lavu__mem.html#ga8f67d2e3fe423b4ed333219e7f591ace" title="Add an element to a dynamic array.">av_dynarray_add_nofree</a>(<span class="keywordtype">void</span> *tab_ptr, <span class="keywordtype">int</span> *nb_ptr, <span class="keywordtype">void</span> *elem);
<a name="l00308"></a>00308 <span class="comment"></span>
<a name="l00309"></a>00309 <span class="comment">/**</span>
<a name="l00310"></a>00310 <span class="comment"> * Add an element of size elem_size to a dynamic array.</span>
<a name="l00311"></a>00311 <span class="comment"> *</span>
<a name="l00312"></a>00312 <span class="comment"> * The array is reallocated when its number of elements reaches powers of 2.</span>
<a name="l00313"></a>00313 <span class="comment"> * Therefore, the amortized cost of adding an element is constant.</span>
<a name="l00314"></a>00314 <span class="comment"> *</span>
<a name="l00315"></a>00315 <span class="comment"> * In case of success, the pointer to the array is updated in order to</span>
<a name="l00316"></a>00316 <span class="comment"> * point to the new grown array, and the number pointed to by nb_ptr</span>
<a name="l00317"></a>00317 <span class="comment"> * is incremented.</span>
<a name="l00318"></a>00318 <span class="comment"> * In case of failure, the array is freed, *tab_ptr is set to NULL and</span>
<a name="l00319"></a>00319 <span class="comment"> * *nb_ptr is set to 0.</span>
<a name="l00320"></a>00320 <span class="comment"> *</span>
<a name="l00321"></a>00321 <span class="comment"> * @param tab_ptr pointer to the array to grow</span>
<a name="l00322"></a>00322 <span class="comment"> * @param nb_ptr pointer to the number of elements in the array</span>
<a name="l00323"></a>00323 <span class="comment"> * @param elem_size size in bytes of the elements in the array</span>
<a name="l00324"></a>00324 <span class="comment"> * @param elem_data pointer to the data of the element to add. If NULL, the space of</span>
<a name="l00325"></a>00325 <span class="comment"> * the new added element is not filled.</span>
<a name="l00326"></a>00326 <span class="comment"> * @return pointer to the data of the element to copy in the new allocated space.</span>
<a name="l00327"></a>00327 <span class="comment"> * If NULL, the new allocated space is left uninitialized."</span>
<a name="l00328"></a>00328 <span class="comment"> * @see av_dynarray_add(), av_dynarray_add_nofree()</span>
<a name="l00329"></a>00329 <span class="comment"> */</span>
<a name="l00330"></a>00330 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#ga9f60ff848186092d6705276a52ea0bb9" title="Add an element of size elem_size to a dynamic array.">av_dynarray2_add</a>(<span class="keywordtype">void</span> **tab_ptr, <span class="keywordtype">int</span> *nb_ptr, <span class="keywordtype">size_t</span> elem_size,
<a name="l00331"></a>00331 <span class="keyword">const</span> uint8_t *elem_data);
<a name="l00332"></a>00332 <span class="comment"></span>
<a name="l00333"></a>00333 <span class="comment">/**</span>
<a name="l00334"></a>00334 <span class="comment"> * Multiply two size_t values checking for overflow.</span>
<a name="l00335"></a>00335 <span class="comment"> * @return 0 if success, AVERROR(EINVAL) if overflow.</span>
<a name="l00336"></a>00336 <span class="comment"> */</span>
<a name="l00337"></a><a class="code" href="group__lavu__mem.html#ga368c719d3bdce4de169910a4158df66b">00337</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="group__lavu__mem.html#ga368c719d3bdce4de169910a4158df66b" title="Multiply two size_t values checking for overflow.">av_size_mult</a>(<span class="keywordtype">size_t</span> a, <span class="keywordtype">size_t</span> b, <span class="keywordtype">size_t</span> *r)
<a name="l00338"></a>00338 {
<a name="l00339"></a>00339 <span class="keywordtype">size_t</span> t = a * b;
<a name="l00340"></a>00340 <span class="comment">/* Hack inspired from glibc: only try the division if nelem and elsize</span>
<a name="l00341"></a>00341 <span class="comment"> * are both greater than sqrt(SIZE_MAX). */</span>
<a name="l00342"></a>00342 <span class="keywordflow">if</span> ((a | b) >= ((<span class="keywordtype">size_t</span>)1 << (<span class="keyword">sizeof</span>(<span class="keywordtype">size_t</span>) * 4)) && a && t / a != b)
<a name="l00343"></a>00343 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(EINVAL);
<a name="l00344"></a>00344 *r = t;
<a name="l00345"></a>00345 <span class="keywordflow">return</span> 0;
<a name="l00346"></a>00346 }
<a name="l00347"></a>00347 <span class="comment"></span>
<a name="l00348"></a>00348 <span class="comment">/**</span>
<a name="l00349"></a>00349 <span class="comment"> * Set the maximum size that may me allocated in one block.</span>
<a name="l00350"></a>00350 <span class="comment"> */</span>
<a name="l00351"></a>00351 <span class="keywordtype">void</span> <a class="code" href="group__lavu__mem.html#ga2204fc859b4a3ca2d5bfd1bf4e8c4dfb" title="Set the maximum size that may me allocated in one block.">av_max_alloc</a>(<span class="keywordtype">size_t</span> max);
<a name="l00352"></a>00352 <span class="comment"></span>
<a name="l00353"></a>00353 <span class="comment">/**</span>
<a name="l00354"></a>00354 <span class="comment"> * deliberately overlapping memcpy implementation</span>
<a name="l00355"></a>00355 <span class="comment"> * @param dst destination buffer</span>
<a name="l00356"></a>00356 <span class="comment"> * @param back how many bytes back we start (the initial size of the overlapping window), must be > 0</span>
<a name="l00357"></a>00357 <span class="comment"> * @param cnt number of bytes to copy, must be >= 0</span>
<a name="l00358"></a>00358 <span class="comment"> *</span>
<a name="l00359"></a>00359 <span class="comment"> * cnt > back is valid, this will copy the bytes we just copied,</span>
<a name="l00360"></a>00360 <span class="comment"> * thus creating a repeating pattern with a period length of back.</span>
<a name="l00361"></a>00361 <span class="comment"> */</span>
<a name="l00362"></a>00362 <span class="keywordtype">void</span> <a class="code" href="group__lavu__mem.html#ga3ea4736dcceab4ba033b8abd2c2a180e" title="deliberately overlapping memcpy implementation">av_memcpy_backptr</a>(uint8_t *dst, <span class="keywordtype">int</span> back, <span class="keywordtype">int</span> cnt);
<a name="l00363"></a>00363 <span class="comment"></span>
<a name="l00364"></a>00364 <span class="comment">/**</span>
<a name="l00365"></a>00365 <span class="comment"> * Reallocate the given block if it is not large enough, otherwise do nothing.</span>
<a name="l00366"></a>00366 <span class="comment"> *</span>
<a name="l00367"></a>00367 <span class="comment"> * @see av_realloc</span>
<a name="l00368"></a>00368 <span class="comment"> */</span>
<a name="l00369"></a>00369 <span class="keywordtype">void</span> *<a class="code" href="group__lavu__mem.html#ga869fd8884d8d29a7a4910d879926d94a" title="Reallocate the given block if it is not large enough, otherwise do nothing.">av_fast_realloc</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> *size, <span class="keywordtype">size_t</span> min_size);
<a name="l00370"></a>00370 <span class="comment"></span>
<a name="l00371"></a>00371 <span class="comment">/**</span>
<a name="l00372"></a>00372 <span class="comment"> * Allocate a buffer, reusing the given one if large enough.</span>
<a name="l00373"></a>00373 <span class="comment"> *</span>
<a name="l00374"></a>00374 <span class="comment"> * Contrary to av_fast_realloc the current buffer contents might not be</span>
<a name="l00375"></a>00375 <span class="comment"> * preserved and on error the old buffer is freed, thus no special</span>
<a name="l00376"></a>00376 <span class="comment"> * handling to avoid memleaks is necessary.</span>
<a name="l00377"></a>00377 <span class="comment"> *</span>
<a name="l00378"></a>00378 <span class="comment"> * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer</span>
<a name="l00379"></a>00379 <span class="comment"> * @param size size of the buffer *ptr points to</span>
<a name="l00380"></a>00380 <span class="comment"> * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and</span>
<a name="l00381"></a>00381 <span class="comment"> * *size 0 if an error occurred.</span>
<a name="l00382"></a>00382 <span class="comment"> */</span>
<a name="l00383"></a>00383 <span class="keywordtype">void</span> <a class="code" href="group__lavu__mem.html#ga29d0252b981f157e713a68ffca52f003" title="Allocate a buffer, reusing the given one if large enough.">av_fast_malloc</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> *size, <span class="keywordtype">size_t</span> min_size);
<a name="l00384"></a>00384 <span class="comment"></span>
<a name="l00385"></a>00385 <span class="comment">/**</span>
<a name="l00386"></a>00386 <span class="comment"> * @}</span>
<a name="l00387"></a>00387 <span class="comment"> */</span>
<a name="l00388"></a>00388
<a name="l00389"></a>00389 <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_MEM_H */</span>
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