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<a href="swresample_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"> * Copyright (C) 2011-2013 Michael Niedermayer (michaelni@gmx.at)</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * This file is part of libswresample</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * libswresample is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * libswresample is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * License along with libswresample; if not, write to the Free Software</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#ifndef SWRESAMPLE_SWRESAMPLE_H</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"></span><span class="preprocessor">#define SWRESAMPLE_SWRESAMPLE_H</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * @file</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * @ingroup lswr</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * libswresample public header</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * @defgroup lswr Libswresample</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * Libswresample (lswr) is a library that handles audio resampling, sample</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * format conversion and mixing.</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * Interaction with lswr is done through SwrContext, which is</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * allocated with swr_alloc() or swr_alloc_set_opts(). It is opaque, so all parameters</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * must be set with the @ref avoptions API.</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"> * The first thing you will need to do in order to use lswr is to allocate</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * SwrContext. This can be done with swr_alloc() or swr_alloc_set_opts(). If you</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * are using the former, you must set options through the @ref avoptions API.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * The latter function provides the same feature, but it allows you to set some</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * common options in the same statement.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * For example the following code will setup conversion from planar float sample</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * format to interleaved signed 16-bit integer, downsampling from 48kHz to</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * 44.1kHz and downmixing from 5.1 channels to stereo (using the default mixing</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * matrix). This is using the swr_alloc() function.</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * SwrContext *swr = swr_alloc();</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * av_opt_set_channel_layout(swr, "in_channel_layout", AV_CH_LAYOUT_5POINT1, 0);</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> * av_opt_set_channel_layout(swr, "out_channel_layout", AV_CH_LAYOUT_STEREO, 0);</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * av_opt_set_int(swr, "in_sample_rate", 48000, 0);</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * av_opt_set_int(swr, "out_sample_rate", 44100, 0);</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * av_opt_set_sample_fmt(swr, "in_sample_fmt", AV_SAMPLE_FMT_FLTP, 0);</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * av_opt_set_sample_fmt(swr, "out_sample_fmt", AV_SAMPLE_FMT_S16, 0);</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * @endcode</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * The same job can be done using swr_alloc_set_opts() as well:</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * SwrContext *swr = swr_alloc_set_opts(NULL, // we're allocating a new context</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> * AV_CH_LAYOUT_STEREO, // out_ch_layout</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * AV_SAMPLE_FMT_S16, // out_sample_fmt</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * 44100, // out_sample_rate</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> * AV_CH_LAYOUT_5POINT1, // in_ch_layout</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> * AV_SAMPLE_FMT_FLTP, // in_sample_fmt</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * 48000, // in_sample_rate</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * 0, // log_offset</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * NULL); // log_ctx</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * @endcode</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * Once all values have been set, it must be initialized with swr_init(). If</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> * you need to change the conversion parameters, you can change the parameters</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> * using @ref AVOptions, as described above in the first example; or by using</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * swr_alloc_set_opts(), but with the first argument the allocated context.</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * You must then call swr_init() again.</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"> 80</span> <span class="comment"> * The conversion itself is done by repeatedly calling swr_convert().</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * Note that the samples may get buffered in swr if you provide insufficient</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * output space or if sample rate conversion is done, which requires "future"</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * samples. Samples that do not require future input can be retrieved at any</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * time by using swr_convert() (in_count can be set to 0).</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * At the end of conversion the resampling buffer can be flushed by calling</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * swr_convert() with NULL in and 0 in_count.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * The samples used in the conversion process can be managed with the libavutil</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * @ref lavu_sampmanip "samples manipulation" API, including av_samples_alloc()</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * function used in the following example.</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * The delay between input and output, can at any time be found by using</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> * swr_get_delay().</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> * The following code demonstrates the conversion loop assuming the parameters</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> * from above and caller-defined functions get_input() and handle_output():</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * uint8_t **input;</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * int in_samples;</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * while (get_input(&input, &in_samples)) {</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * uint8_t *output;</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * int out_samples = av_rescale_rnd(swr_get_delay(swr, 48000) +</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * in_samples, 44100, 48000, AV_ROUND_UP);</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * av_samples_alloc(&output, NULL, 2, out_samples,</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> * AV_SAMPLE_FMT_S16, 0);</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * out_samples = swr_convert(swr, &output, out_samples,</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * input, in_samples);</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> * handle_output(output, out_samples);</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> * av_freep(&output);</span></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"> * @endcode</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> * When the conversion is finished, the conversion</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * context and everything associated with it must be freed with swr_free().</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * A swr_close() function is also available, but it exists mainly for</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * compatibility with libavresample, and is not required to be called.</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * There will be no memory leak if the data is not completely flushed before</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * swr_free().</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="preprocessor">#include <stdint.h></span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="preprocessor">#include "<a class="code" href="frame_8h.html">libavutil/frame.h</a>"</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="preprocessor">#include "<a class="code" href="samplefmt_8h.html">libavutil/samplefmt.h</a>"</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="preprocessor">#include "<a class="code" href="libswresample_2version_8h.html">libswresample/version.h</a>"</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="preprocessor">#if LIBSWRESAMPLE_VERSION_MAJOR < 1</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="preprocessor"></span><span class="preprocessor">#define SWR_CH_MAX 32 </span><span class="comment">///< Maximum number of channels</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"></span>#endif</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"> 133</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * @name Option constants</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> * These constants are used for the @ref avoptions interface for lswr.</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> *</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> </div>
<div class="line"><a name="l00140"></a><span class="lineno"><a class="line" href="group__lswr.html#ga2226aca7f49137f3f29b6f731a985916"> 140</a></span> <span class="preprocessor">#define SWR_FLAG_RESAMPLE 1 </span><span class="comment">///< Force resampling even if equal sample rate</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"></span>//TODO use int resample ?</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment">//long term TODO can we enable this dynamically?</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"></span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment">/** Dithering algorithms */</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"><a class="line" href="group__lswr.html#ga387e613b19e5269a46d9ff1a5ee3fcd4"> 145</a></span> <span class="keyword">enum</span> <a class="code" href="group__lswr.html#ga387e613b19e5269a46d9ff1a5ee3fcd4">SwrDitherType</a> {</div>
<div class="line"><a name="l00146"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4afacc17a82581598f762a8036ba559836"> 146</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4afacc17a82581598f762a8036ba559836">SWR_DITHER_NONE</a> = 0,</div>
<div class="line"><a name="l00147"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a0fec2dd28b1357b50e9807ca6ecee83a"> 147</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a0fec2dd28b1357b50e9807ca6ecee83a">SWR_DITHER_RECTANGULAR</a>,</div>
<div class="line"><a name="l00148"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae4635dc355dc680eeb211e7af17ddfd2"> 148</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae4635dc355dc680eeb211e7af17ddfd2">SWR_DITHER_TRIANGULAR</a>,</div>
<div class="line"><a name="l00149"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a91276f2e437aa9d0d8bdffabe24f5532"> 149</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a91276f2e437aa9d0d8bdffabe24f5532">SWR_DITHER_TRIANGULAR_HIGHPASS</a>,</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div>
<div class="line"><a name="l00151"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae6858a54f5b2e1bffa9aaef20b2593c0"> 151</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae6858a54f5b2e1bffa9aaef20b2593c0">SWR_DITHER_NS</a> = 64, <span class="comment">///< not part of API/ABI</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a6f6072071262f7f05a52057cfe48df87"> 152</a></span> <span class="comment"></span> <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a6f6072071262f7f05a52057cfe48df87">SWR_DITHER_NS_LIPSHITZ</a>,</div>
<div class="line"><a name="l00153"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae197d7fc5592652aaa8edf1067c56af9"> 153</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae197d7fc5592652aaa8edf1067c56af9">SWR_DITHER_NS_F_WEIGHTED</a>,</div>
<div class="line"><a name="l00154"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a60eeb8ca5de47916a81f2c3a6534eed4"> 154</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a60eeb8ca5de47916a81f2c3a6534eed4">SWR_DITHER_NS_MODIFIED_E_WEIGHTED</a>,</div>
<div class="line"><a name="l00155"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ad13d2ff2831d463eb46ca4c46dfec7b0"> 155</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ad13d2ff2831d463eb46ca4c46dfec7b0">SWR_DITHER_NS_IMPROVED_E_WEIGHTED</a>,</div>
<div class="line"><a name="l00156"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae3aba4bf43c2210a148b11c0215b5d24"> 156</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae3aba4bf43c2210a148b11c0215b5d24">SWR_DITHER_NS_SHIBATA</a>,</div>
<div class="line"><a name="l00157"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4af275c21089abbf78a6623544f34d76f9"> 157</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4af275c21089abbf78a6623544f34d76f9">SWR_DITHER_NS_LOW_SHIBATA</a>,</div>
<div class="line"><a name="l00158"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ac569828a706ccf22a8d5810c973c8f17"> 158</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ac569828a706ccf22a8d5810c973c8f17">SWR_DITHER_NS_HIGH_SHIBATA</a>,</div>
<div class="line"><a name="l00159"></a><span class="lineno"><a class="line" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4aacbdf2f91bb14cf390116492115fb8ea"> 159</a></span>  <a class="code" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4aacbdf2f91bb14cf390116492115fb8ea">SWR_DITHER_NB</a>, <span class="comment">///< not part of API/ABI</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"></span>};</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">/** Resampling Engines */</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"><a class="line" href="group__lswr.html#ga87f9e023bbe780d3ccf17dfc7abed580"> 163</a></span> <span class="keyword">enum</span> <a class="code" href="group__lswr.html#ga87f9e023bbe780d3ccf17dfc7abed580">SwrEngine</a> {</div>
<div class="line"><a name="l00164"></a><span class="lineno"><a class="line" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a11652db5af0c279d79deba1c577c9729"> 164</a></span>  <a class="code" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a11652db5af0c279d79deba1c577c9729">SWR_ENGINE_SWR</a>, <span class="comment">/**< SW Resampler */</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"><a class="line" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a2933f5b0b96829095a04a8acd19b27e7"> 165</a></span>  <a class="code" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a2933f5b0b96829095a04a8acd19b27e7">SWR_ENGINE_SOXR</a>, <span class="comment">/**< SoX Resampler */</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a865af2e70ebb85b3cafb93f1854dbef9"> 166</a></span>  <a class="code" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a865af2e70ebb85b3cafb93f1854dbef9">SWR_ENGINE_NB</a>, <span class="comment">///< not part of API/ABI</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"></span>};</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">/** Resampling Filter Types */</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"><a class="line" href="group__lswr.html#ga2176b2a3a8b809788f6e7ccdc238b6be"> 170</a></span> <span class="keyword">enum</span> <a class="code" href="group__lswr.html#ga2176b2a3a8b809788f6e7ccdc238b6be">SwrFilterType</a> {</div>
<div class="line"><a name="l00171"></a><span class="lineno"><a class="line" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea1a6413b9888bac851e2ee4f991f01d0c"> 171</a></span>  <a class="code" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea1a6413b9888bac851e2ee4f991f01d0c">SWR_FILTER_TYPE_CUBIC</a>, <span class="comment">/**< Cubic */</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"><a class="line" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea17f5dd4512b4abc2285905293a81cf55"> 172</a></span>  <a class="code" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea17f5dd4512b4abc2285905293a81cf55">SWR_FILTER_TYPE_BLACKMAN_NUTTALL</a>, <span class="comment">/**< Blackman Nuttall windowed sinc */</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"><a class="line" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea8f492a5dc94b6e41a37f190c5492bf3f"> 173</a></span>  <a class="code" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea8f492a5dc94b6e41a37f190c5492bf3f">SWR_FILTER_TYPE_KAISER</a>, <span class="comment">/**< Kaiser windowed sinc */</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> };</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"></span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"></span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> * The libswresample context. Unlike libavcodec and libavformat, this structure</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> * is opaque. This means that if you would like to set options, you must use</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"> * the @ref avoptions API and cannot directly set values to members of the</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"> * structure.</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"><a class="line" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863"> 186</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a>;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"></span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> * Get the AVClass for SwrContext. It can be used in combination with</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> * AV_OPT_SEARCH_FAKE_OBJ for examining options.</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"> * @see av_opt_find().</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> * @return the AVClass of SwrContext</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="keyword">const</span> <a class="code" href="structAVClass.html">AVClass</a> *<a class="code" href="group__lswr.html#ga6ca0298348b382cf0fe67d7f339a17f3">swr_get_class</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"></span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"> * @name SwrContext constructor functions</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment"></span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> * Allocate SwrContext.</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="comment"> * If you use this function you will need to set the parameters (manually or</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="comment"> * with swr_alloc_set_opts()) before calling swr_init().</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment"> * @see swr_alloc_set_opts(), swr_init(), swr_free()</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"> * @return NULL on error, allocated context otherwise</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="keyword">struct </span><a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *<a class="code" href="group__lswr.html#gaf58c4ff10f73d74bdab8e5aa7193147c">swr_alloc</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="comment"></span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment"> * Initialize context after user parameters have been set.</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment"> * @note The context must be configured using the AVOption API.</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> * @see av_opt_set_int()</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"> * @see av_opt_set_dict()</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * @param[in,out] s Swr context to initialize</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> * @return AVERROR error code in case of failure.</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67">swr_init</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s);</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"></span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> * Check whether an swr context has been initialized or not.</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> * @param[in] s Swr context to check</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * @see swr_init()</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> * @return positive if it has been initialized, 0 if not initialized</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#gab11b02705e97404b6d74b18b2fcfdfcf">swr_is_initialized</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s);</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"></span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"> * Allocate SwrContext if needed and set/reset common parameters.</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment"> * This function does not require s to be allocated with swr_alloc(). On the</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"> * other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> * on the allocated context.</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> * @param s existing Swr context if available, or NULL if not</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> * @param out_ch_layout output channel layout (AV_CH_LAYOUT_*)</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> * @param out_sample_fmt output sample format (AV_SAMPLE_FMT_*).</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="comment"> * @param out_sample_rate output sample rate (frequency in Hz)</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> <span class="comment"> * @param in_ch_layout input channel layout (AV_CH_LAYOUT_*)</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="comment"> * @param in_sample_fmt input sample format (AV_SAMPLE_FMT_*).</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> <span class="comment"> * @param in_sample_rate input sample rate (frequency in Hz)</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="comment"> * @param log_offset logging level offset</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"> * @param log_ctx parent logging context, can be NULL</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="comment"> * @see swr_init(), swr_free()</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"> * @return NULL on error, allocated context otherwise</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="keyword">struct </span><a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *<a class="code" href="group__lswr.html#gad7f29022726c871aadf935281a9813bc">swr_alloc_set_opts</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s,</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  int64_t out_ch_layout, <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> out_sample_fmt, <span class="keywordtype">int</span> out_sample_rate,</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  int64_t in_ch_layout, <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> in_sample_fmt, <span class="keywordtype">int</span> in_sample_rate,</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordtype">int</span> log_offset, <span class="keywordtype">void</span> *log_ctx);</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment"></span></div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="comment"> * @name SwrContext destructor functions</span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="comment"></span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> <span class="comment"> * Free the given SwrContext and set the pointer to NULL.</span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="comment"> * @param[in] s a pointer to a pointer to Swr context</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="keywordtype">void</span> <a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34">swr_free</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> **s);</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> <span class="comment"></span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span> <span class="comment"> * Closes the context so that swr_is_initialized() returns 0.</span></div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> <span class="comment"> * The context can be brought back to life by running swr_init(),</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> <span class="comment"> * swr_init() can also be used without swr_close().</span></div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> <span class="comment"> * This function is mainly provided for simplifying the usecase</span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> <span class="comment"> * where one tries to support libavresample and libswresample.</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> <span class="comment"> * @param[in,out] s Swr context to be closed</span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="keywordtype">void</span> <a class="code" href="group__lswr.html#gaa4bf1048740dfc08d68aba9f1b4db22e">swr_close</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s);</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="comment"></span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="comment"> * @name Core conversion functions</span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="comment"></span></div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="comment">/** Convert audio.</span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="comment"> * in and in_count can be set to 0 to flush the last few samples out at the</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="comment"> * end.</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="comment"> * If more input is provided than output space, then the input will be buffered.</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment"> * You can avoid this buffering by using swr_get_out_samples() to retrieve an</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment"> * upper bound on the required number of output samples for the given number of</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="comment"> * input samples. Conversion will run directly without copying whenever possible.</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="comment"> * @param s allocated Swr context, with parameters set</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> <span class="comment"> * @param out output buffers, only the first one need be set in case of packed audio</span></div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="comment"> * @param out_count amount of space available for output in samples per channel</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="comment"> * @param in input buffers, only the first one need to be set in case of packed audio</span></div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="comment"> * @param in_count number of input samples available in one channel</span></div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> <span class="comment"> * @return number of samples output per channel, negative value on error</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a">swr_convert</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, uint8_t **out, <span class="keywordtype">int</span> out_count,</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keyword">const</span> uint8_t **in , <span class="keywordtype">int</span> in_count);</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="comment"></span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> <span class="comment"> * Convert the next timestamp from input to output</span></div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> <span class="comment"> * timestamps are in 1/(in_sample_rate * out_sample_rate) units.</span></div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> <span class="comment"> * @note There are 2 slightly differently behaving modes.</span></div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="comment"> * @li When automatic timestamp compensation is not used, (min_compensation >= FLT_MAX)</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="comment"> * in this case timestamps will be passed through with delays compensated</span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="comment"> * @li When automatic timestamp compensation is used, (min_compensation < FLT_MAX)</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="comment"> * in this case the output timestamps will match output sample numbers.</span></div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="comment"> * See ffmpeg-resampler(1) for the two modes of compensation.</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="comment"> * @param s[in] initialized Swr context</span></div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="comment"> * @param pts[in] timestamp for the next input sample, INT64_MIN if unknown</span></div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="comment"> * @see swr_set_compensation(), swr_drop_output(), and swr_inject_silence() are</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="comment"> * function used internally for timestamp compensation.</span></div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="comment"> * @return the output timestamp for the next output sample</span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> int64_t <a class="code" href="group__lswr.html#gaad9811626c6c01a241f6bf46aff27333">swr_next_pts</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int64_t <a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7">pts</a>);</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="comment"></span></div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="comment"> * @name Low-level option setting functions</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="comment"> * These functons provide a means to set low-level options that is not possible</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="comment"> * with the AVOption API.</span></div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span> <span class="comment"></span></div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="comment"> * Activate resampling compensation ("soft" compensation). This function is</span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="comment"> * internally called when needed in swr_next_pts().</span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment"> * @param[in,out] s allocated Swr context. If it is not initialized,</span></div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment"> * or SWR_FLAG_RESAMPLE is not set, swr_init() is</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"> * called with the flag set.</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="comment"> * @param[in] sample_delta delta in PTS per sample</span></div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="comment"> * @param[in] compensation_distance number of samples to compensate for</span></div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="comment"> * @return >= 0 on success, AVERROR error codes if:</span></div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> <span class="comment"> * @li @c s is NULL,</span></div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> <span class="comment"> * @li @c compensation_distance is less than 0,</span></div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> <span class="comment"> * @li @c compensation_distance is 0 but sample_delta is not,</span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> <span class="comment"> * @li compensation unsupported by resampler, or</span></div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="comment"> * @li swr_init() fails when called.</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#gab7f21690522b85d7757e13fa9853d4d8">swr_set_compensation</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, <span class="keywordtype">int</span> sample_delta, <span class="keywordtype">int</span> compensation_distance);</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> <span class="comment"></span></div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> <span class="comment"> * Set a customized input channel mapping.</span></div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="comment"> * @param[in,out] s allocated Swr context, not yet initialized</span></div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> <span class="comment"> * @param[in] channel_map customized input channel mapping (array of channel</span></div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> <span class="comment"> * indexes, -1 for a muted channel)</span></div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span> <span class="comment"> * @return >= 0 on success, or AVERROR error code in case of failure.</span></div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#ga1b528050b5f5b704aecbfbc257a17ef0">swr_set_channel_mapping</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, <span class="keyword">const</span> <span class="keywordtype">int</span> *channel_map);</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span> <span class="comment"></span></div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> <span class="comment"> * Set a customized remix matrix.</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span> <span class="comment"> * @param s allocated Swr context, not yet initialized</span></div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span> <span class="comment"> * @param matrix remix coefficients; matrix[i + stride * o] is</span></div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> <span class="comment"> * the weight of input channel i in output channel o</span></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span> <span class="comment"> * @param stride offset between lines of the matrix</span></div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> <span class="comment"> * @return >= 0 on success, or AVERROR error code in case of failure.</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#gaf9064d65b1e654dc78f7d6bcd2e8c747">swr_set_matrix</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, <span class="keyword">const</span> <span class="keywordtype">double</span> *matrix, <span class="keywordtype">int</span> stride);</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> <span class="comment"></span></div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> <span class="comment"> * @name Sample handling functions</span></div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> <span class="comment"></span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="comment"> * Drops the specified number of output samples.</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> <span class="comment"> * This function, along with swr_inject_silence(), is called by swr_next_pts()</span></div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> <span class="comment"> * if needed for "hard" compensation.</span></div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> <span class="comment"> * @param s allocated Swr context</span></div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> <span class="comment"> * @param count number of samples to be dropped</span></div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span> <span class="comment"> * @return >= 0 on success, or a negative AVERROR code on failure</span></div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#ga43d7ba4507891fc25aacbbea5cdfb065">swr_drop_output</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, <span class="keywordtype">int</span> count);</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span> <span class="comment"></span></div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span> <span class="comment"> * Injects the specified number of silence samples.</span></div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span> <span class="comment"> * This function, along with swr_drop_output(), is called by swr_next_pts()</span></div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span> <span class="comment"> * if needed for "hard" compensation.</span></div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span> <span class="comment"> * @param s allocated Swr context</span></div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span> <span class="comment"> * @param count number of samples to be dropped</span></div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span> <span class="comment"> * @return >= 0 on success, or a negative AVERROR code on failure</span></div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#ga4733ed4779ed3e30379de2a6ef8de837">swr_inject_silence</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, <span class="keywordtype">int</span> count);</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span> <span class="comment"></span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span> <span class="comment"> * Gets the delay the next input sample will experience relative to the next output sample.</span></div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> <span class="comment"> * Swresample can buffer data if more input has been provided than available</span></div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span> <span class="comment"> * output space, also converting between sample rates needs a delay.</span></div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span> <span class="comment"> * This function returns the sum of all such delays.</span></div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <span class="comment"> * The exact delay is not necessarily an integer value in either input or</span></div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span> <span class="comment"> * output sample rate. Especially when downsampling by a large value, the</span></div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span> <span class="comment"> * output sample rate may be a poor choice to represent the delay, similarly</span></div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span> <span class="comment"> * for upsampling and the input sample rate.</span></div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="comment"> * @param s swr context</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="comment"> * @param base timebase in which the returned delay will be:</span></div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span> <span class="comment"> * @li if it's set to 1 the returned delay is in seconds</span></div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span> <span class="comment"> * @li if it's set to 1000 the returned delay is in milliseconds</span></div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span> <span class="comment"> * @li if it's set to the input sample rate then the returned</span></div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> <span class="comment"> * delay is in input samples</span></div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span> <span class="comment"> * @li if it's set to the output sample rate then the returned</span></div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span> <span class="comment"> * delay is in output samples</span></div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span> <span class="comment"> * @li if it's the least common multiple of in_sample_rate and</span></div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span> <span class="comment"> * out_sample_rate then an exact rounding-free delay will be</span></div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span> <span class="comment"> * returned</span></div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> <span class="comment"> * @returns the delay in 1 / @c base units.</span></div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> int64_t <a class="code" href="group__lswr.html#ga5121a5a7890a2d23b72dc871dd0ebb06">swr_get_delay</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int64_t base);</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> <span class="comment"></span></div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span> <span class="comment"> * Find an upper bound on the number of samples that the next swr_convert</span></div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span> <span class="comment"> * call will output, if called with in_samples of input samples. This</span></div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span> <span class="comment"> * depends on the internal state, and anything changing the internal state</span></div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span> <span class="comment"> * (like further swr_convert() calls) will may change the number of samples</span></div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span> <span class="comment"> * swr_get_out_samples() returns for the same number of input samples.</span></div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> <span class="comment"> * @param in_samples number of input samples.</span></div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> <span class="comment"> * @note any call to swr_inject_silence(), swr_convert(), swr_next_pts()</span></div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span> <span class="comment"> * or swr_set_compensation() invalidates this limit</span></div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span> <span class="comment"> * @note it is recommended to pass the correct available buffer size</span></div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span> <span class="comment"> * to all functions like swr_convert() even if swr_get_out_samples()</span></div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> <span class="comment"> * indicates that less would be used.</span></div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> <span class="comment"> * @returns an upper bound on the number of samples that the next swr_convert</span></div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span> <span class="comment"> * will output or a negative value to indicate an error</span></div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#ga97a8d5f6abe3bcdfb6072412f17285a4">swr_get_out_samples</a>(<span class="keyword">struct</span> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, <span class="keywordtype">int</span> in_samples);</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span> <span class="comment"></span></div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span> <span class="comment"> * @name Configuration accessors</span></div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> <span class="comment"></span></div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span> <span class="comment"> * Return the @ref LIBSWRESAMPLE_VERSION_INT constant.</span></div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span> <span class="comment"> * This is useful to check if the build-time libswresample has the same version</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span> <span class="comment"> * as the run-time one.</span></div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span> <span class="comment"> * @returns the unsigned int-typed version</span></div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span> <span class="keywordtype">unsigned</span> <a class="code" href="group__lswr.html#gaed39c2153a1e26b4ef656ec8c765a2e3">swresample_version</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span> <span class="comment"></span></div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span> <span class="comment"> * Return the swr build-time configuration.</span></div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> <span class="comment"> * @returns the build-time @c ./configure flags</span></div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="group__lswr.html#gad602fde7a824753d5adc57e7f1372e27">swresample_configuration</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span> <span class="comment"></span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span> <span class="comment"> * Return the swr license.</span></div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span> <span class="comment"> * @returns the license of libswresample, determined at build-time</span></div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="group__lswr.html#ga29c5657b18632e206a99d1ae27225499">swresample_license</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span> <span class="comment"></span></div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> <span class="comment"> * @name AVFrame based API</span></div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span> <span class="comment"></span></div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span> <span class="comment"> * Convert the samples in the input AVFrame and write them to the output AVFrame.</span></div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span> <span class="comment"> * Input and output AVFrames must have channel_layout, sample_rate and format set.</span></div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span> <span class="comment"> * If the output AVFrame does not have the data pointers allocated the nb_samples</span></div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span> <span class="comment"> * field will be set using av_frame_get_buffer()</span></div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span> <span class="comment"> * is called to allocate the frame.</span></div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span> <span class="comment"> * The output AVFrame can be NULL or have fewer allocated samples than required.</span></div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span> <span class="comment"> * In this case, any remaining samples not written to the output will be added</span></div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span> <span class="comment"> * to an internal FIFO buffer, to be returned at the next call to this function</span></div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span> <span class="comment"> * or to swr_convert().</span></div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span> <span class="comment"> * If converting sample rate, there may be data remaining in the internal</span></div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span> <span class="comment"> * resampling delay buffer. swr_get_delay() tells the number of</span></div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span> <span class="comment"> * remaining samples. To get this data as output, call this function or</span></div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span> <span class="comment"> * swr_convert() with NULL input.</span></div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span> <span class="comment"> * If the SwrContext configuration does not match the output and</span></div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span> <span class="comment"> * input AVFrame settings the conversion does not take place and depending on</span></div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span> <span class="comment"> * which AVFrame is not matching AVERROR_OUTPUT_CHANGED, AVERROR_INPUT_CHANGED</span></div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span> <span class="comment"> * or the result of a bitwise-OR of them is returned.</span></div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span> <span class="comment"> * @see swr_delay()</span></div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span> <span class="comment"> * @see swr_convert()</span></div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span> <span class="comment"> * @see swr_get_delay()</span></div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span> <span class="comment"> * @param swr audio resample context</span></div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span> <span class="comment"> * @param output output AVFrame</span></div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span> <span class="comment"> * @param input input AVFrame</span></div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span> <span class="comment"> * @return 0 on success, AVERROR on failure or nonmatching</span></div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span> <span class="comment"> * configuration.</span></div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#gac482028c01d95580106183aa84b0930c">swr_convert_frame</a>(<a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *swr,</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  <a class="code" href="structAVFrame.html">AVFrame</a> *output, <span class="keyword">const</span> <a class="code" href="structAVFrame.html">AVFrame</a> *input);</div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span> <span class="comment"></span></div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span> <span class="comment"> * Configure or reconfigure the SwrContext using the information</span></div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span> <span class="comment"> * provided by the AVFrames.</span></div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span> <span class="comment"> * The original resampling context is reset even on failure.</span></div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span> <span class="comment"> * The function calls swr_close() internally if the context is open.</span></div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span> <span class="comment"> * @see swr_close();</span></div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span> <span class="comment"> * @param swr audio resample context</span></div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span> <span class="comment"> * @param output output AVFrame</span></div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span> <span class="comment"> * @param input input AVFrame</span></div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span> <span class="comment"> * @return 0 on success, AVERROR on failure.</span></div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span> <span class="keywordtype">int</span> <a class="code" href="group__lswr.html#ga73ade2cf6934765cf518c6c917b77c76">swr_config_frame</a>(<a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *swr, <span class="keyword">const</span> <a class="code" href="structAVFrame.html">AVFrame</a> *out, <span class="keyword">const</span> <a class="code" href="structAVFrame.html">AVFrame</a> *in);</div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span> <span class="comment"></span></div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> </div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span> <span class="preprocessor">#endif </span><span class="comment">/* SWRESAMPLE_SWRESAMPLE_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4ac569828a706ccf22a8d5810c973c8f17"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ac569828a706ccf22a8d5810c973c8f17">SWR_DITHER_NS_HIGH_SHIBATA</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00158">swresample.h:158</a></div></div>
<div class="ttc" id="group__lswr_html_gaa4bf1048740dfc08d68aba9f1b4db22e"><div class="ttname"><a href="group__lswr.html#gaa4bf1048740dfc08d68aba9f1b4db22e">swr_close</a></div><div class="ttdeci">void swr_close(struct SwrContext *s)</div><div class="ttdoc">Closes the context so that swr_is_initialized() returns 0. </div></div>
<div class="ttc" id="structAVFrame_html"><div class="ttname"><a href="structAVFrame.html">AVFrame</a></div><div class="ttdoc">This structure describes decoded (raw) audio or video data. </div><div class="ttdef"><b>Definition:</b> <a href="frame_8h_source.html#l00181">frame.h:181</a></div></div>
<div class="ttc" id="group__lswr_html_gga87f9e023bbe780d3ccf17dfc7abed580a2933f5b0b96829095a04a8acd19b27e7"><div class="ttname"><a href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a2933f5b0b96829095a04a8acd19b27e7">SWR_ENGINE_SOXR</a></div><div class="ttdoc">SoX Resampler. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00165">swresample.h:165</a></div></div>
<div class="ttc" id="group__lswr_html_ga2176b2a3a8b809788f6e7ccdc238b6be"><div class="ttname"><a href="group__lswr.html#ga2176b2a3a8b809788f6e7ccdc238b6be">SwrFilterType</a></div><div class="ttdeci">SwrFilterType</div><div class="ttdoc">Resampling Filter Types. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00170">swresample.h:170</a></div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4ad13d2ff2831d463eb46ca4c46dfec7b0"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ad13d2ff2831d463eb46ca4c46dfec7b0">SWR_DITHER_NS_IMPROVED_E_WEIGHTED</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00155">swresample.h:155</a></div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4a60eeb8ca5de47916a81f2c3a6534eed4"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a60eeb8ca5de47916a81f2c3a6534eed4">SWR_DITHER_NS_MODIFIED_E_WEIGHTED</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00154">swresample.h:154</a></div></div>
<div class="ttc" id="group__lswr_html_gaad9811626c6c01a241f6bf46aff27333"><div class="ttname"><a href="group__lswr.html#gaad9811626c6c01a241f6bf46aff27333">swr_next_pts</a></div><div class="ttdeci">int64_t swr_next_pts(struct SwrContext *s, int64_t pts)</div><div class="ttdoc">Convert the next timestamp from input to output timestamps are in 1/(in_sample_rate * out_sample_rate...</div></div>
<div class="ttc" id="samplefmt_8h_html"><div class="ttname"><a href="samplefmt_8h.html">samplefmt.h</a></div></div>
<div class="ttc" id="group__lswr_html_ga97a8d5f6abe3bcdfb6072412f17285a4"><div class="ttname"><a href="group__lswr.html#ga97a8d5f6abe3bcdfb6072412f17285a4">swr_get_out_samples</a></div><div class="ttdeci">int swr_get_out_samples(struct SwrContext *s, int in_samples)</div><div class="ttdoc">Find an upper bound on the number of samples that the next swr_convert call will output, if called with in_samples of input samples. </div></div>
<div class="ttc" id="group__lswr_html_gab7f21690522b85d7757e13fa9853d4d8"><div class="ttname"><a href="group__lswr.html#gab7f21690522b85d7757e13fa9853d4d8">swr_set_compensation</a></div><div class="ttdeci">int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance)</div><div class="ttdoc">Activate resampling compensation ("soft" compensation). </div></div>
<div class="ttc" id="group__lswr_html_gaf58c4ff10f73d74bdab8e5aa7193147c"><div class="ttname"><a href="group__lswr.html#gaf58c4ff10f73d74bdab8e5aa7193147c">swr_alloc</a></div><div class="ttdeci">struct SwrContext * swr_alloc(void)</div><div class="ttdoc">Allocate SwrContext. </div></div>
<div class="ttc" id="group__lswr_html_ga387e613b19e5269a46d9ff1a5ee3fcd4"><div class="ttname"><a href="group__lswr.html#ga387e613b19e5269a46d9ff1a5ee3fcd4">SwrDitherType</a></div><div class="ttdeci">SwrDitherType</div><div class="ttdoc">Dithering algorithms. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00145">swresample.h:145</a></div></div>
<div class="ttc" id="group__lswr_html_gaa5bb6cab830146efa8c760fa66ee582a"><div class="ttname"><a href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a">swr_convert</a></div><div class="ttdeci">int swr_convert(struct SwrContext *s, uint8_t **out, int out_count, const uint8_t **in, int in_count)</div><div class="ttdoc">Convert audio. </div></div>
<div class="ttc" id="group__lswr_html_gga2176b2a3a8b809788f6e7ccdc238b6bea8f492a5dc94b6e41a37f190c5492bf3f"><div class="ttname"><a href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea8f492a5dc94b6e41a37f190c5492bf3f">SWR_FILTER_TYPE_KAISER</a></div><div class="ttdoc">Kaiser windowed sinc. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00173">swresample.h:173</a></div></div>
<div class="ttc" id="group__lswr_html_ga87f9e023bbe780d3ccf17dfc7abed580"><div class="ttname"><a href="group__lswr.html#ga87f9e023bbe780d3ccf17dfc7abed580">SwrEngine</a></div><div class="ttdeci">SwrEngine</div><div class="ttdoc">Resampling Engines. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00163">swresample.h:163</a></div></div>
<div class="ttc" id="group__lswr_html_gga2176b2a3a8b809788f6e7ccdc238b6bea17f5dd4512b4abc2285905293a81cf55"><div class="ttname"><a href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea17f5dd4512b4abc2285905293a81cf55">SWR_FILTER_TYPE_BLACKMAN_NUTTALL</a></div><div class="ttdoc">Blackman Nuttall windowed sinc. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00172">swresample.h:172</a></div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4ae4635dc355dc680eeb211e7af17ddfd2"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae4635dc355dc680eeb211e7af17ddfd2">SWR_DITHER_TRIANGULAR</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00148">swresample.h:148</a></div></div>
<div class="ttc" id="group__lswr_html_ga5121a5a7890a2d23b72dc871dd0ebb06"><div class="ttname"><a href="group__lswr.html#ga5121a5a7890a2d23b72dc871dd0ebb06">swr_get_delay</a></div><div class="ttdeci">int64_t swr_get_delay(struct SwrContext *s, int64_t base)</div><div class="ttdoc">Gets the delay the next input sample will experience relative to the next output sample. </div></div>
<div class="ttc" id="group__lswr_html_gga87f9e023bbe780d3ccf17dfc7abed580a865af2e70ebb85b3cafb93f1854dbef9"><div class="ttname"><a href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a865af2e70ebb85b3cafb93f1854dbef9">SWR_ENGINE_NB</a></div><div class="ttdoc">not part of API/ABI </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00166">swresample.h:166</a></div></div>
<div class="ttc" id="group__lswr_html_ga4aa775b7fba31d2c8dc14c7b7e282863"><div class="ttname"><a href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a></div><div class="ttdeci">struct SwrContext SwrContext</div><div class="ttdoc">The libswresample context. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00186">swresample.h:186</a></div></div>
<div class="ttc" id="frame_8h_html"><div class="ttname"><a href="frame_8h.html">frame.h</a></div><div class="ttdoc">reference-counted frame API </div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4aacbdf2f91bb14cf390116492115fb8ea"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4aacbdf2f91bb14cf390116492115fb8ea">SWR_DITHER_NB</a></div><div class="ttdoc">not part of API/ABI </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00159">swresample.h:159</a></div></div>
<div class="ttc" id="group__lswr_html_ga43d7ba4507891fc25aacbbea5cdfb065"><div class="ttname"><a href="group__lswr.html#ga43d7ba4507891fc25aacbbea5cdfb065">swr_drop_output</a></div><div class="ttdeci">int swr_drop_output(struct SwrContext *s, int count)</div><div class="ttdoc">Drops the specified number of output samples. </div></div>
<div class="ttc" id="group__lswr_html_gaf9064d65b1e654dc78f7d6bcd2e8c747"><div class="ttname"><a href="group__lswr.html#gaf9064d65b1e654dc78f7d6bcd2e8c747">swr_set_matrix</a></div><div class="ttdeci">int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride)</div><div class="ttdoc">Set a customized remix matrix. </div></div>
<div class="ttc" id="group__lswr_html_gad7f29022726c871aadf935281a9813bc"><div class="ttname"><a href="group__lswr.html#gad7f29022726c871aadf935281a9813bc">swr_alloc_set_opts</a></div><div class="ttdeci">struct SwrContext * swr_alloc_set_opts(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx)</div><div class="ttdoc">Allocate SwrContext if needed and set/reset common parameters. </div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4ae6858a54f5b2e1bffa9aaef20b2593c0"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae6858a54f5b2e1bffa9aaef20b2593c0">SWR_DITHER_NS</a></div><div class="ttdoc">not part of API/ABI </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00151">swresample.h:151</a></div></div>
<div class="ttc" id="group__lswr_html_ga6ca0298348b382cf0fe67d7f339a17f3"><div class="ttname"><a href="group__lswr.html#ga6ca0298348b382cf0fe67d7f339a17f3">swr_get_class</a></div><div class="ttdeci">const AVClass * swr_get_class(void)</div><div class="ttdoc">Get the AVClass for SwrContext. </div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4afacc17a82581598f762a8036ba559836"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4afacc17a82581598f762a8036ba559836">SWR_DITHER_NONE</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00146">swresample.h:146</a></div></div>
<div class="ttc" id="group__lavu__sampfmts_html_gaf9a51ca15301871723577c730b5865c5"><div class="ttname"><a href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a></div><div class="ttdeci">AVSampleFormat</div><div class="ttdoc">Audio sample formats. </div><div class="ttdef"><b>Definition:</b> <a href="samplefmt_8h_source.html#l00059">samplefmt.h:59</a></div></div>
<div class="ttc" id="group__lswr_html_ga818f7d78b1ad7d8d5b70de374b668c34"><div class="ttname"><a href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34">swr_free</a></div><div class="ttdeci">void swr_free(struct SwrContext **s)</div><div class="ttdoc">Free the given SwrContext and set the pointer to NULL. </div></div>
<div class="ttc" id="group__lswr_html_ga1b528050b5f5b704aecbfbc257a17ef0"><div class="ttname"><a href="group__lswr.html#ga1b528050b5f5b704aecbfbc257a17ef0">swr_set_channel_mapping</a></div><div class="ttdeci">int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map)</div><div class="ttdoc">Set a customized input channel mapping. </div></div>
<div class="ttc" id="structAVClass_html"><div class="ttname"><a href="structAVClass.html">AVClass</a></div><div class="ttdoc">Describe the class of an AVClass context structure. </div><div class="ttdef"><b>Definition:</b> <a href="log_8h_source.html#l00067">log.h:67</a></div></div>
<div class="ttc" id="group__lswr_html_ga29c5657b18632e206a99d1ae27225499"><div class="ttname"><a href="group__lswr.html#ga29c5657b18632e206a99d1ae27225499">swresample_license</a></div><div class="ttdeci">const char * swresample_license(void)</div><div class="ttdoc">Return the swr license. </div></div>
<div class="ttc" id="libswresample_2version_8h_html"><div class="ttname"><a href="libswresample_2version_8h.html">version.h</a></div><div class="ttdoc">Libswresample version macros. </div></div>
<div class="ttc" id="group__lswr_html_gga2176b2a3a8b809788f6e7ccdc238b6bea1a6413b9888bac851e2ee4f991f01d0c"><div class="ttname"><a href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea1a6413b9888bac851e2ee4f991f01d0c">SWR_FILTER_TYPE_CUBIC</a></div><div class="ttdoc">Cubic. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00171">swresample.h:171</a></div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4a6f6072071262f7f05a52057cfe48df87"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a6f6072071262f7f05a52057cfe48df87">SWR_DITHER_NS_LIPSHITZ</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00152">swresample.h:152</a></div></div>
<div class="ttc" id="transcode__aac_8c_html_a4fbb704fb96c36a78a36eee010306ce7"><div class="ttname"><a href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7">pts</a></div><div class="ttdeci">static int64_t pts</div><div class="ttdoc">Global timestamp for the audio frames. </div><div class="ttdef"><b>Definition:</b> <a href="transcode__aac_8c_source.html#l00547">transcode_aac.c:547</a></div></div>
<div class="ttc" id="group__lswr_html_gga87f9e023bbe780d3ccf17dfc7abed580a11652db5af0c279d79deba1c577c9729"><div class="ttname"><a href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a11652db5af0c279d79deba1c577c9729">SWR_ENGINE_SWR</a></div><div class="ttdoc">SW Resampler. </div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00164">swresample.h:164</a></div></div>
<div class="ttc" id="group__lswr_html_gac482028c01d95580106183aa84b0930c"><div class="ttname"><a href="group__lswr.html#gac482028c01d95580106183aa84b0930c">swr_convert_frame</a></div><div class="ttdeci">int swr_convert_frame(SwrContext *swr, AVFrame *output, const AVFrame *input)</div><div class="ttdoc">Convert the samples in the input AVFrame and write them to the output AVFrame. </div></div>
<div class="ttc" id="group__lswr_html_ga73ade2cf6934765cf518c6c917b77c76"><div class="ttname"><a href="group__lswr.html#ga73ade2cf6934765cf518c6c917b77c76">swr_config_frame</a></div><div class="ttdeci">int swr_config_frame(SwrContext *swr, const AVFrame *out, const AVFrame *in)</div><div class="ttdoc">Configure or reconfigure the SwrContext using the information provided by the AVFrames. </div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4a91276f2e437aa9d0d8bdffabe24f5532"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a91276f2e437aa9d0d8bdffabe24f5532">SWR_DITHER_TRIANGULAR_HIGHPASS</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00149">swresample.h:149</a></div></div>
<div class="ttc" id="group__lswr_html_gaed39c2153a1e26b4ef656ec8c765a2e3"><div class="ttname"><a href="group__lswr.html#gaed39c2153a1e26b4ef656ec8c765a2e3">swresample_version</a></div><div class="ttdeci">unsigned swresample_version(void)</div><div class="ttdoc">Return the LIBSWRESAMPLE_VERSION_INT constant. </div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4af275c21089abbf78a6623544f34d76f9"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4af275c21089abbf78a6623544f34d76f9">SWR_DITHER_NS_LOW_SHIBATA</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00157">swresample.h:157</a></div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4ae197d7fc5592652aaa8edf1067c56af9"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae197d7fc5592652aaa8edf1067c56af9">SWR_DITHER_NS_F_WEIGHTED</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00153">swresample.h:153</a></div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4a0fec2dd28b1357b50e9807ca6ecee83a"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a0fec2dd28b1357b50e9807ca6ecee83a">SWR_DITHER_RECTANGULAR</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00147">swresample.h:147</a></div></div>
<div class="ttc" id="group__lswr_html_gab11b02705e97404b6d74b18b2fcfdfcf"><div class="ttname"><a href="group__lswr.html#gab11b02705e97404b6d74b18b2fcfdfcf">swr_is_initialized</a></div><div class="ttdeci">int swr_is_initialized(struct SwrContext *s)</div><div class="ttdoc">Check whether an swr context has been initialized or not. </div></div>
<div class="ttc" id="group__lswr_html_gga387e613b19e5269a46d9ff1a5ee3fcd4ae3aba4bf43c2210a148b11c0215b5d24"><div class="ttname"><a href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae3aba4bf43c2210a148b11c0215b5d24">SWR_DITHER_NS_SHIBATA</a></div><div class="ttdef"><b>Definition:</b> <a href="swresample_8h_source.html#l00156">swresample.h:156</a></div></div>
<div class="ttc" id="group__lswr_html_gad602fde7a824753d5adc57e7f1372e27"><div class="ttname"><a href="group__lswr.html#gad602fde7a824753d5adc57e7f1372e27">swresample_configuration</a></div><div class="ttdeci">const char * swresample_configuration(void)</div><div class="ttdoc">Return the swr build-time configuration. </div></div>
<div class="ttc" id="group__lswr_html_ga4733ed4779ed3e30379de2a6ef8de837"><div class="ttname"><a href="group__lswr.html#ga4733ed4779ed3e30379de2a6ef8de837">swr_inject_silence</a></div><div class="ttdeci">int swr_inject_silence(struct SwrContext *s, int count)</div><div class="ttdoc">Injects the specified number of silence samples. </div></div>
<div class="ttc" id="group__lswr_html_gae173e8ed91717700471a1dcd06f00f67"><div class="ttname"><a href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67">swr_init</a></div><div class="ttdeci">int swr_init(struct SwrContext *s)</div><div class="ttdoc">Initialize context after user parameters have been set. </div></div>
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