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<div class="title">rational.h</div> </div>
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<a href="rational_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * rational numbers</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at></span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This file is part of FFmpeg.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * @file</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * rational numbers</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * @author Michael Niedermayer <michaelni@gmx.at></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#ifndef AVUTIL_RATIONAL_H</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_RATIONAL_H</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <stdint.h></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <limits.h></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include "<a class="code" href="attributes_8h.html">attributes.h</a>"</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * @addtogroup lavu_math</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"></span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * rational number numerator/denominator</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="structAVRational.html"> 43</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structAVRational.html">AVRational</a>{</div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9"> 44</a></span>  <span class="keywordtype">int</span> <a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a>; <span class="comment">///< numerator</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3"> 45</a></span> <span class="comment"></span> <span class="keywordtype">int</span> <a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a>; <span class="comment">///< denominator</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"></span>} <a class="code" href="structAVRational.html">AVRational</a>;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"></span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * Create a rational.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * Useful for compilers that do not support compound literals.</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * @note The return value is not reduced.</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="group__lavu__math.html#ga7778b1d209ceb3e4bf34e40150d3b882"> 53</a></span> <span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="structAVRational.html">AVRational</a> <a class="code" href="group__lavu__math.html#ga7778b1d209ceb3e4bf34e40150d3b882">av_make_q</a>(<span class="keywordtype">int</span> num, <span class="keywordtype">int</span> den)</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <a class="code" href="structAVRational.html">AVRational</a> r = { num, den };</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">return</span> r;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> }</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"></span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * Compare two rationals.</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * @param a first rational</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * @param b second rational</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * @return 0 if a==b, 1 if a>b, -1 if a<b, and INT_MIN if one of the</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> * values is of the form 0/0</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="group__lavu__math.html#gaa440bf42ede128219a571ae4ce0f90b8"> 66</a></span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="group__lavu__math.html#gaa440bf42ede128219a571ae4ce0f90b8">av_cmp_q</a>(<a class="code" href="structAVRational.html">AVRational</a> a, <a class="code" href="structAVRational.html">AVRational</a> b){</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">const</span> int64_t tmp= a.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a> * (int64_t)b.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a> - b.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a> * (int64_t)a.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a>;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span>(tmp) <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)((tmp ^ a.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a> ^ b.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a>)>>63)|1;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>(b.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a> && a.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a>) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>(a.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a> && b.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a>) <span class="keywordflow">return</span> (a.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a>>>31) - (b.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a>>>31);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">else</span> <span class="keywordflow">return</span> INT_MIN;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> }</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> * Convert rational to double.</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * @param a rational to convert</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * @return (double) a</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"><a class="line" href="group__lavu__math.html#ga935dbbf6bde8dfe5fa7ddb1da582eb07"> 80</a></span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="group__lavu__math.html#ga935dbbf6bde8dfe5fa7ddb1da582eb07">av_q2d</a>(<a class="code" href="structAVRational.html">AVRational</a> a){</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> a.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a> / (double) a.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a>;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"></span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * Reduce a fraction.</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * This is useful for framerate calculations.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * @param dst_num destination numerator</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * @param dst_den destination denominator</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * @param num source numerator</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * @param den source denominator</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> * @param max the maximum allowed for dst_num & dst_den</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * @return 1 if exact, 0 otherwise</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="keywordtype">int</span> <a class="code" href="group__lavu__math.html#ga4fd9c0b8e663cf3d55e89fbc6ce71602">av_reduce</a>(<span class="keywordtype">int</span> *dst_num, <span class="keywordtype">int</span> *dst_den, int64_t num, int64_t den, int64_t max);</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"></span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> * Multiply two rationals.</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * @param b first rational</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * @param c second rational</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> * @return b*c</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <a class="code" href="structAVRational.html">AVRational</a> <a class="code" href="group__lavu__math.html#ga3f9c69432582e2857147bcba3c75dc32">av_mul_q</a>(<a class="code" href="structAVRational.html">AVRational</a> b, <a class="code" href="structAVRational.html">AVRational</a> c) <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"></span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * Divide one rational by another.</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> * @param b first rational</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * @param c second rational</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * @return b/c</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <a class="code" href="structAVRational.html">AVRational</a> <a class="code" href="group__lavu__math.html#gaffa24e7bd38e12dbac540d8b66461f97">av_div_q</a>(<a class="code" href="structAVRational.html">AVRational</a> b, <a class="code" href="structAVRational.html">AVRational</a> c) <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a>;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"></span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"> * Add two rationals.</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> * @param b first rational</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * @param c second rational</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * @return b+c</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <a class="code" href="structAVRational.html">AVRational</a> <a class="code" href="group__lavu__math.html#ga2eb3a275aabacd8421f140a12bab4a91">av_add_q</a>(<a class="code" href="structAVRational.html">AVRational</a> b, <a class="code" href="structAVRational.html">AVRational</a> c) <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a>;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"></span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> * Subtract one rational from another.</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * @param b first rational</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * @param c second rational</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> * @return b-c</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <a class="code" href="structAVRational.html">AVRational</a> <a class="code" href="group__lavu__math.html#gac66c6198ce5e8a8caf88dfc20782fa59">av_sub_q</a>(<a class="code" href="structAVRational.html">AVRational</a> b, <a class="code" href="structAVRational.html">AVRational</a> c) <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a>;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"></span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * Invert a rational.</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> * @param q value</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> * @return 1 / q</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="group__lavu__math.html#gab646f0a7cc30af543ba4a91b37f9de6e"> 133</a></span> <span class="keyword">static</span> <a class="code" href="attributes_8h.html#a28f50f4c125959216885f01d56dbe866">av_always_inline</a> <a class="code" href="structAVRational.html">AVRational</a> <a class="code" href="group__lavu__math.html#gab646f0a7cc30af543ba4a91b37f9de6e">av_inv_q</a>(<a class="code" href="structAVRational.html">AVRational</a> q)</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> {</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <a class="code" href="structAVRational.html">AVRational</a> r = { q.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a>, q.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a> };</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">return</span> r;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"></span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> * Convert a double precision floating point number to a rational.</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> * inf is expressed as {1,0} or {-1,0} depending on the sign.</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> * @param d double to convert</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> * @param max the maximum allowed numerator and denominator</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> * @return (AVRational) d</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <a class="code" href="structAVRational.html">AVRational</a> <a class="code" href="group__lavu__math.html#ga7dfd5ba1eb1edf5845ac32b338de9e76">av_d2q</a>(<span class="keywordtype">double</span> d, <span class="keywordtype">int</span> max) <a class="code" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a>;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"></span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> * @return 1 if q1 is nearer to q than q2, -1 if q2 is nearer</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> * than q1, 0 if they have the same distance.</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="keywordtype">int</span> <a class="code" href="group__lavu__math.html#ga111810c563749cd3081aaa19004f44df">av_nearer_q</a>(<a class="code" href="structAVRational.html">AVRational</a> q, <a class="code" href="structAVRational.html">AVRational</a> q1, <a class="code" href="structAVRational.html">AVRational</a> q2);</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"></span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> * Find the nearest value in q_list to q.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"> * @param q_list an array of rationals terminated by {0, 0}</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> * @return the index of the nearest value found in the array</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="keywordtype">int</span> <a class="code" href="group__lavu__math.html#ga63d5ef1c2f77a5fdccb2b3a1c8cc77f5">av_find_nearest_q_idx</a>(<a class="code" href="structAVRational.html">AVRational</a> q, <span class="keyword">const</span> <a class="code" href="structAVRational.html">AVRational</a>* q_list);</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"></span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> * Converts a AVRational to a IEEE 32bit float.</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> * The float is returned in a uint32_t and its value is platform indepenant.</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> uint32_t <a class="code" href="group__lavu__math.html#gafbcd96878344ade957d5bccc6bc705b2">av_q2intfloat</a>(<a class="code" href="structAVRational.html">AVRational</a> q);</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"></span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_RATIONAL_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="attributes_8h_html_a9eaead3cde73464fd66bab4cef9307ad"><div class="ttname"><a href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a></div><div class="ttdeci">#define av_const</div><div class="ttdef"><b>Definition:</b> <a href="attributes_8h_source.html#l00076">attributes.h:76</a></div></div>
<div class="ttc" id="group__lavu__math_html_gafbcd96878344ade957d5bccc6bc705b2"><div class="ttname"><a href="group__lavu__math.html#gafbcd96878344ade957d5bccc6bc705b2">av_q2intfloat</a></div><div class="ttdeci">uint32_t av_q2intfloat(AVRational q)</div><div class="ttdoc">Converts a AVRational to a IEEE 32bit float. </div></div>
<div class="ttc" id="structAVRational_html_ae9a98c10a301c5e937095105b6f0fdb9"><div class="ttname"><a href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">AVRational::num</a></div><div class="ttdeci">int num</div><div class="ttdoc">numerator </div><div class="ttdef"><b>Definition:</b> <a href="rational_8h_source.html#l00044">rational.h:44</a></div></div>
<div class="ttc" id="group__lavu__math_html_gaa440bf42ede128219a571ae4ce0f90b8"><div class="ttname"><a href="group__lavu__math.html#gaa440bf42ede128219a571ae4ce0f90b8">av_cmp_q</a></div><div class="ttdeci">static int av_cmp_q(AVRational a, AVRational b)</div><div class="ttdoc">Compare two rationals. </div><div class="ttdef"><b>Definition:</b> <a href="rational_8h_source.html#l00066">rational.h:66</a></div></div>
<div class="ttc" id="group__lavu__math_html_ga7778b1d209ceb3e4bf34e40150d3b882"><div class="ttname"><a href="group__lavu__math.html#ga7778b1d209ceb3e4bf34e40150d3b882">av_make_q</a></div><div class="ttdeci">static AVRational av_make_q(int num, int den)</div><div class="ttdoc">Create a rational. </div><div class="ttdef"><b>Definition:</b> <a href="rational_8h_source.html#l00053">rational.h:53</a></div></div>
<div class="ttc" id="attributes_8h_html"><div class="ttname"><a href="attributes_8h.html">attributes.h</a></div><div class="ttdoc">Macro definitions for various function/variable attributes. </div></div>
<div class="ttc" id="group__lavu__math_html_ga935dbbf6bde8dfe5fa7ddb1da582eb07"><div class="ttname"><a href="group__lavu__math.html#ga935dbbf6bde8dfe5fa7ddb1da582eb07">av_q2d</a></div><div class="ttdeci">static double av_q2d(AVRational a)</div><div class="ttdoc">Convert rational to double. </div><div class="ttdef"><b>Definition:</b> <a href="rational_8h_source.html#l00080">rational.h:80</a></div></div>
<div class="ttc" id="group__lavu__math_html_ga3f9c69432582e2857147bcba3c75dc32"><div class="ttname"><a href="group__lavu__math.html#ga3f9c69432582e2857147bcba3c75dc32">av_mul_q</a></div><div class="ttdeci">AVRational av_mul_q(AVRational b, AVRational c) av_const</div><div class="ttdoc">Multiply two rationals. </div></div>
<div class="ttc" id="group__lavu__math_html_ga2eb3a275aabacd8421f140a12bab4a91"><div class="ttname"><a href="group__lavu__math.html#ga2eb3a275aabacd8421f140a12bab4a91">av_add_q</a></div><div class="ttdeci">AVRational av_add_q(AVRational b, AVRational c) av_const</div><div class="ttdoc">Add two rationals. </div></div>
<div class="ttc" id="group__lavu__math_html_ga111810c563749cd3081aaa19004f44df"><div class="ttname"><a href="group__lavu__math.html#ga111810c563749cd3081aaa19004f44df">av_nearer_q</a></div><div class="ttdeci">int av_nearer_q(AVRational q, AVRational q1, AVRational q2)</div></div>
<div class="ttc" id="group__lavu__math_html_gaffa24e7bd38e12dbac540d8b66461f97"><div class="ttname"><a href="group__lavu__math.html#gaffa24e7bd38e12dbac540d8b66461f97">av_div_q</a></div><div class="ttdeci">AVRational av_div_q(AVRational b, AVRational c) av_const</div><div class="ttdoc">Divide one rational by another. </div></div>
<div class="ttc" id="group__lavu__math_html_ga4fd9c0b8e663cf3d55e89fbc6ce71602"><div class="ttname"><a href="group__lavu__math.html#ga4fd9c0b8e663cf3d55e89fbc6ce71602">av_reduce</a></div><div class="ttdeci">int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)</div><div class="ttdoc">Reduce a fraction. </div></div>
<div class="ttc" id="group__lavu__math_html_gac66c6198ce5e8a8caf88dfc20782fa59"><div class="ttname"><a href="group__lavu__math.html#gac66c6198ce5e8a8caf88dfc20782fa59">av_sub_q</a></div><div class="ttdeci">AVRational av_sub_q(AVRational b, AVRational c) av_const</div><div class="ttdoc">Subtract one rational from another. </div></div>
<div class="ttc" id="group__lavu__math_html_ga7dfd5ba1eb1edf5845ac32b338de9e76"><div class="ttname"><a href="group__lavu__math.html#ga7dfd5ba1eb1edf5845ac32b338de9e76">av_d2q</a></div><div class="ttdeci">AVRational av_d2q(double d, int max) av_const</div><div class="ttdoc">Convert a double precision floating point number to a rational. </div></div>
<div class="ttc" id="group__lavu__math_html_ga63d5ef1c2f77a5fdccb2b3a1c8cc77f5"><div class="ttname"><a href="group__lavu__math.html#ga63d5ef1c2f77a5fdccb2b3a1c8cc77f5">av_find_nearest_q_idx</a></div><div class="ttdeci">int av_find_nearest_q_idx(AVRational q, const AVRational *q_list)</div><div class="ttdoc">Find the nearest value in q_list to q. </div></div>
<div class="ttc" id="structAVRational_html"><div class="ttname"><a href="structAVRational.html">AVRational</a></div><div class="ttdoc">rational number numerator/denominator </div><div class="ttdef"><b>Definition:</b> <a href="rational_8h_source.html#l00043">rational.h:43</a></div></div>
<div class="ttc" id="group__lavu__math_html_gab646f0a7cc30af543ba4a91b37f9de6e"><div class="ttname"><a href="group__lavu__math.html#gab646f0a7cc30af543ba4a91b37f9de6e">av_inv_q</a></div><div class="ttdeci">static av_always_inline AVRational av_inv_q(AVRational q)</div><div class="ttdoc">Invert a rational. </div><div class="ttdef"><b>Definition:</b> <a href="rational_8h_source.html#l00133">rational.h:133</a></div></div>
<div class="ttc" id="structAVRational_html_aee46bdac67d965ac0a4204e753f910c3"><div class="ttname"><a href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">AVRational::den</a></div><div class="ttdeci">int den</div><div class="ttdoc">denominator </div><div class="ttdef"><b>Definition:</b> <a href="rational_8h_source.html#l00045">rational.h:45</a></div></div>
<div class="ttc" id="attributes_8h_html_a28f50f4c125959216885f01d56dbe866"><div class="ttname"><a href="attributes_8h.html#a28f50f4c125959216885f01d56dbe866">av_always_inline</a></div><div class="ttdeci">#define av_always_inline</div><div class="ttdef"><b>Definition:</b> <a href="attributes_8h_source.html#l00039">attributes.h:39</a></div></div>
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