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<div class="title">resampling_audio.c</div> </div>
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<a href="resampling__audio_8c.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) 2012 Stefano Sabatini</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"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * in the Software without restriction, including without limitation the rights</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * furnished to do so, subject to the following conditions:</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"> * The above copyright notice and this permission notice shall be included in</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * THE SOFTWARE.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * @example resampling_audio.c</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * libswresample API use example.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <<a class="code" href="opt_8h.html">libavutil/opt.h</a>></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <<a class="code" href="channel__layout_8h.html">libavutil/channel_layout.h</a>></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <<a class="code" href="samplefmt_8h.html">libavutil/samplefmt.h</a>></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <<a class="code" href="swresample_8h.html">libswresample/swresample.h</a>></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="resampling__audio_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89"> 33</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="resampling__audio_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">get_format_from_sample_fmt</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> **fmt,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> sample_fmt)</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">struct </span>sample_fmt_entry {</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> sample_fmt; <span class="keyword">const</span> <span class="keywordtype">char</span> *fmt_be, *fmt_le;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  } sample_fmt_entries[] = {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5adf0f66f21492f8fd5db6debb8b3f932a">AV_SAMPLE_FMT_U8</a>, <span class="stringliteral">"u8"</span>, <span class="stringliteral">"u8"</span> },</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af">AV_SAMPLE_FMT_S16</a>, <span class="stringliteral">"s16be"</span>, <span class="stringliteral">"s16le"</span> },</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ab7ae6bb6718c07cd316778783a57a63b">AV_SAMPLE_FMT_S32</a>, <span class="stringliteral">"s32be"</span>, <span class="stringliteral">"s32le"</span> },</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5a5251d62cc3c7f18e56bc8e0c48a27903">AV_SAMPLE_FMT_FLT</a>, <span class="stringliteral">"f32be"</span>, <span class="stringliteral">"f32le"</span> },</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ae35a2a6a7593723d9fe4bcefb2876606">AV_SAMPLE_FMT_DBL</a>, <span class="stringliteral">"f64be"</span>, <span class="stringliteral">"f64le"</span> },</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  };</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  *fmt = NULL;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">for</span> (i = 0; i < <a class="code" href="common_8h.html#a3508a98d3ee7e2c9a4841fe264cf70f7">FF_ARRAY_ELEMS</a>(sample_fmt_entries); i++) {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">struct </span>sample_fmt_entry *entry = &sample_fmt_entries[i];</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (sample_fmt == entry->sample_fmt) {</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  *fmt = <a class="code" href="common_8h.html#a309bdca20f6a78431379fc69442d98ea">AV_NE</a>(entry->fmt_be, entry->fmt_le);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  }</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  fprintf(stderr,</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="stringliteral">"Sample format %s not supported as output format\n"</span>,</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <a class="code" href="group__lavu__sampfmts.html#ga31b9d149b2de9821a65f4f5612970838">av_get_sample_fmt_name</a>(sample_fmt));</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(EINVAL);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> }</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * Fill dst buffer with nb_samples, generated starting from t.</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"><a class="line" href="resampling__audio_8c.html#af40a34d598e4ae80bc0539e9f5761c5f"> 65</a></span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="resampling__audio_8c.html#af40a34d598e4ae80bc0539e9f5761c5f">fill_samples</a>(<span class="keywordtype">double</span> *dst, <span class="keywordtype">int</span> nb_samples, <span class="keywordtype">int</span> nb_channels, <span class="keywordtype">int</span> sample_rate, <span class="keywordtype">double</span> *t)</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordtype">int</span> i, j;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">double</span> tincr = 1.0 / sample_rate, *dstp = dst;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> c = 2 * <a class="code" href="mathematics_8h.html#ae71449b1cc6e6250b91f539153a7a0d3">M_PI</a> * 440.0;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">/* generate sin tone with 440Hz frequency and duplicated channels */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">for</span> (i = 0; i < nb_samples; i++) {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  *dstp = sin(c * *t);</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">for</span> (j = 1; j < nb_channels; j++)</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  dstp[j] = dstp[0];</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  dstp += nb_channels;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  *t += tincr;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="resampling__audio_8c.html#a3c04138a5bfe5d72780bb7e82a18e627"> 81</a></span> <span class="keywordtype">int</span> <a class="code" href="resampling__audio_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  int64_t src_ch_layout = <a class="code" href="group__channel__mask__c.html#gabc6d6651bba254cd0fa2c42a57228e65">AV_CH_LAYOUT_STEREO</a>, dst_ch_layout = <a class="code" href="group__channel__mask__c.html#ga625aec7f2285dc35e3ed801e91889564">AV_CH_LAYOUT_SURROUND</a>;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">int</span> src_rate = 48000, dst_rate = 44100;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  uint8_t **src_data = NULL, **dst_data = NULL;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">int</span> src_nb_channels = 0, dst_nb_channels = 0;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordtype">int</span> src_linesize, dst_linesize;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">int</span> src_nb_samples = 1024, dst_nb_samples, max_dst_nb_samples;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> src_sample_fmt = <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ae35a2a6a7593723d9fe4bcefb2876606">AV_SAMPLE_FMT_DBL</a>, dst_sample_fmt = <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af">AV_SAMPLE_FMT_S16</a>;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *dst_filename = NULL;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  FILE *dst_file;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordtype">int</span> dst_bufsize;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *fmt;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">struct </span><a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *swr_ctx;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">double</span> t;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">int</span> ret;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">if</span> (argc != 2) {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  fprintf(stderr, <span class="stringliteral">"Usage: %s output_file\n"</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="stringliteral">"API example program to show how to resample an audio stream with libswresample.\n"</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="stringliteral">"This program generates a series of audio frames, resamples them to a specified "</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="stringliteral">"output format and rate and saves them to an output file named output_file.\n"</span>,</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  argv[0]);</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  exit(1);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  }</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  dst_filename = argv[1];</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  dst_file = fopen(dst_filename, <span class="stringliteral">"wb"</span>);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">if</span> (!dst_file) {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  fprintf(stderr, <span class="stringliteral">"Could not open destination file %s\n"</span>, dst_filename);</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  exit(1);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  }</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">/* create resampler context */</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  swr_ctx = <a class="code" href="group__lswr.html#gaf58c4ff10f73d74bdab8e5aa7193147c">swr_alloc</a>();</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (!swr_ctx) {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  fprintf(stderr, <span class="stringliteral">"Could not allocate resampler context\n"</span>);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  }</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">/* set options */</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"in_channel_layout"</span>, src_ch_layout, 0);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"in_sample_rate"</span>, src_rate, 0);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <a class="code" href="group__opt__set__funcs.html#gad446f7a7b92442e464d43e400e661040">av_opt_set_sample_fmt</a>(swr_ctx, <span class="stringliteral">"in_sample_fmt"</span>, src_sample_fmt, 0);</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>  <a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"out_channel_layout"</span>, dst_ch_layout, 0);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"out_sample_rate"</span>, dst_rate, 0);</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <a class="code" href="group__opt__set__funcs.html#gad446f7a7b92442e464d43e400e661040">av_opt_set_sample_fmt</a>(swr_ctx, <span class="stringliteral">"out_sample_fmt"</span>, dst_sample_fmt, 0);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">/* initialize the resampling context */</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">if</span> ((ret = <a class="code" href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67">swr_init</a>(swr_ctx)) < 0) {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  fprintf(stderr, <span class="stringliteral">"Failed to initialize the resampling context\n"</span>);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="comment">/* allocate source and destination samples buffers */</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  src_nb_channels = <a class="code" href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380">av_get_channel_layout_nb_channels</a>(src_ch_layout);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  ret = <a class="code" href="group__lavu__sampmanip.html#gae8b9f22f2f659d023f111390d9545273">av_samples_alloc_array_and_samples</a>(&src_data, &src_linesize, src_nb_channels,</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  src_nb_samples, src_sample_fmt, 0);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  fprintf(stderr, <span class="stringliteral">"Could not allocate source samples\n"</span>);</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="comment">/* compute the number of converted samples: buffering is avoided</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> * ensuring that the output buffer will contain at least all the</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"> * converted input samples */</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  max_dst_nb_samples = dst_nb_samples =</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <a class="code" href="group__lavu__math.html#gad686ab94939ed4c65218309e94bdca72">av_rescale_rnd</a>(src_nb_samples, dst_rate, src_rate, <a class="code" href="group__lavu__math.html#gga921d656eaf2c4d6800a734a13af021d0aa1d28e08e2f8b49b256e056f93038c1a">AV_ROUND_UP</a>);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">/* buffer is going to be directly written to a rawaudio file, no alignment */</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  dst_nb_channels = <a class="code" href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380">av_get_channel_layout_nb_channels</a>(dst_ch_layout);</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  ret = <a class="code" href="group__lavu__sampmanip.html#gae8b9f22f2f659d023f111390d9545273">av_samples_alloc_array_and_samples</a>(&dst_data, &dst_linesize, dst_nb_channels,</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  dst_nb_samples, dst_sample_fmt, 0);</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  fprintf(stderr, <span class="stringliteral">"Could not allocate destination samples\n"</span>);</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  }</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  t = 0;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">do</span> {</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">/* generate synthetic audio */</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <a class="code" href="resampling__audio_8c.html#af40a34d598e4ae80bc0539e9f5761c5f">fill_samples</a>((<span class="keywordtype">double</span> *)src_data[0], src_nb_samples, src_nb_channels, src_rate, &t);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">/* compute destination number of samples */</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  dst_nb_samples = <a class="code" href="group__lavu__math.html#gad686ab94939ed4c65218309e94bdca72">av_rescale_rnd</a>(<a class="code" href="group__lswr.html#ga5121a5a7890a2d23b72dc871dd0ebb06">swr_get_delay</a>(swr_ctx, src_rate) +</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  src_nb_samples, dst_rate, src_rate, <a class="code" href="group__lavu__math.html#gga921d656eaf2c4d6800a734a13af021d0aa1d28e08e2f8b49b256e056f93038c1a">AV_ROUND_UP</a>);</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">if</span> (dst_nb_samples > max_dst_nb_samples) {</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&dst_data[0]);</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  ret = <a class="code" href="group__lavu__sampmanip.html#ga4db4c77f928d32c7d8854732f50b8c04">av_samples_alloc</a>(dst_data, &dst_linesize, dst_nb_channels,</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  dst_nb_samples, dst_sample_fmt, 1);</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">if</span> (ret < 0)</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  max_dst_nb_samples = dst_nb_samples;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  }</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="comment">/* convert to destination format */</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  ret = <a class="code" href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a">swr_convert</a>(swr_ctx, dst_data, dst_nb_samples, (<span class="keyword">const</span> uint8_t **)src_data, src_nb_samples);</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  fprintf(stderr, <span class="stringliteral">"Error while converting\n"</span>);</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  }</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  dst_bufsize = <a class="code" href="group__lavu__sampfmts.html#gaa7368bc4e3a366b688e81938ed55eb06">av_samples_get_buffer_size</a>(&dst_linesize, dst_nb_channels,</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  ret, dst_sample_fmt, 1);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">if</span> (dst_bufsize < 0) {</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  fprintf(stderr, <span class="stringliteral">"Could not get sample buffer size\n"</span>);</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  }</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  printf(<span class="stringliteral">"t:%f in:%d out:%d\n"</span>, t, src_nb_samples, ret);</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  fwrite(dst_data[0], 1, dst_bufsize, dst_file);</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  } <span class="keywordflow">while</span> (t < 10);</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">if</span> ((ret = <a class="code" href="resampling__audio_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">get_format_from_sample_fmt</a>(&fmt, dst_sample_fmt)) < 0)</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  fprintf(stderr, <span class="stringliteral">"Resampling succeeded. Play the output file with the command:\n"</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="stringliteral">"ffplay -f %s -channel_layout %"</span>PRId64<span class="stringliteral">" -channels %d -ar %d %s\n"</span>,</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  fmt, dst_ch_layout, dst_nb_channels, dst_rate, dst_filename);</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> end:</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  fclose(dst_file);</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> </div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">if</span> (src_data)</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&src_data[0]);</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&src_data);</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">if</span> (dst_data)</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&dst_data[0]);</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&dst_data);</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> </div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34">swr_free</a>(&swr_ctx);</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">return</span> ret < 0;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> }</div>
<div class="ttc" id="resampling__audio_8c_html_a5e068fc5e6dc5c59638ec235f7f6db89"><div class="ttname"><a href="resampling__audio_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">get_format_from_sample_fmt</a></div><div class="ttdeci">static int get_format_from_sample_fmt(const char **fmt, enum AVSampleFormat sample_fmt)</div><div class="ttdef"><b>Definition:</b> <a href="resampling__audio_8c_source.html#l00033">resampling_audio.c:33</a></div></div>
<div class="ttc" id="group__lavu__math_html_gad686ab94939ed4c65218309e94bdca72"><div class="ttname"><a href="group__lavu__math.html#gad686ab94939ed4c65218309e94bdca72">av_rescale_rnd</a></div><div class="ttdeci">int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const</div><div class="ttdoc">Rescale a 64-bit integer with specified rounding. </div></div>
<div class="ttc" id="group__channel__mask__c_html_ga625aec7f2285dc35e3ed801e91889564"><div class="ttname"><a href="group__channel__mask__c.html#ga625aec7f2285dc35e3ed801e91889564">AV_CH_LAYOUT_SURROUND</a></div><div class="ttdeci">#define AV_CH_LAYOUT_SURROUND</div><div class="ttdef"><b>Definition:</b> <a href="channel__layout_8h_source.html#l00089">channel_layout.h:89</a></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__channel__mask__c_html_gabc6d6651bba254cd0fa2c42a57228e65"><div class="ttname"><a href="group__channel__mask__c.html#gabc6d6651bba254cd0fa2c42a57228e65">AV_CH_LAYOUT_STEREO</a></div><div class="ttdeci">#define AV_CH_LAYOUT_STEREO</div><div class="ttdef"><b>Definition:</b> <a href="channel__layout_8h_source.html#l00086">channel_layout.h:86</a></div></div>
<div class="ttc" id="group__lavu__sampfmts_html_ggaf9a51ca15301871723577c730b5865c5a5251d62cc3c7f18e56bc8e0c48a27903"><div class="ttname"><a href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5a5251d62cc3c7f18e56bc8e0c48a27903">AV_SAMPLE_FMT_FLT</a></div><div class="ttdoc">float </div><div class="ttdef"><b>Definition:</b> <a href="samplefmt_8h_source.html#l00064">samplefmt.h:64</a></div></div>
<div class="ttc" id="group__lavu__sampmanip_html_gae8b9f22f2f659d023f111390d9545273"><div class="ttname"><a href="group__lavu__sampmanip.html#gae8b9f22f2f659d023f111390d9545273">av_samples_alloc_array_and_samples</a></div><div class="ttdeci">int av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)</div><div class="ttdoc">Allocate a data pointers array, samples buffer for nb_samples samples, and fill data pointers and lin...</div></div>
<div class="ttc" id="group__lavu__mem_html_ga0cc84043ea2167ad005c86e11d0bcdba"><div class="ttname"><a href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a></div><div class="ttdeci">void av_freep(void *ptr)</div><div class="ttdoc">Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...</div></div>
<div class="ttc" id="group__channel__mask__c_html_gac95619abeb32e4a3daa18e3ff3419380"><div class="ttname"><a href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380">av_get_channel_layout_nb_channels</a></div><div class="ttdeci">int av_get_channel_layout_nb_channels(uint64_t channel_layout)</div><div class="ttdoc">Return the number of channels in the channel layout. </div></div>
<div class="ttc" id="group__lavu__math_html_gga921d656eaf2c4d6800a734a13af021d0aa1d28e08e2f8b49b256e056f93038c1a"><div class="ttname"><a href="group__lavu__math.html#gga921d656eaf2c4d6800a734a13af021d0aa1d28e08e2f8b49b256e056f93038c1a">AV_ROUND_UP</a></div><div class="ttdoc">Round toward +infinity. </div><div class="ttdef"><b>Definition:</b> <a href="mathematics_8h_source.html#l00074">mathematics.h:74</a></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="opt_8h_html"><div class="ttname"><a href="opt_8h.html">opt.h</a></div><div class="ttdoc">AVOptions. </div></div>
<div class="ttc" id="common_8h_html_a309bdca20f6a78431379fc69442d98ea"><div class="ttname"><a href="common_8h.html#a309bdca20f6a78431379fc69442d98ea">AV_NE</a></div><div class="ttdeci">#define AV_NE(be, le)</div><div class="ttdef"><b>Definition:</b> <a href="common_8h_source.html#l00050">common.h:50</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__lavu__sampfmts_html_ggaf9a51ca15301871723577c730b5865c5ab7ae6bb6718c07cd316778783a57a63b"><div class="ttname"><a href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ab7ae6bb6718c07cd316778783a57a63b">AV_SAMPLE_FMT_S32</a></div><div class="ttdoc">signed 32 bits </div><div class="ttdef"><b>Definition:</b> <a href="samplefmt_8h_source.html#l00063">samplefmt.h:63</a></div></div>
<div class="ttc" id="resampling__audio_8c_html_a3c04138a5bfe5d72780bb7e82a18e627"><div class="ttname"><a href="resampling__audio_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a></div><div class="ttdeci">int main(int argc, char **argv)</div><div class="ttdef"><b>Definition:</b> <a href="resampling__audio_8c_source.html#l00081">resampling_audio.c:81</a></div></div>
<div class="ttc" id="swresample_8h_html"><div class="ttname"><a href="swresample_8h.html">swresample.h</a></div><div class="ttdoc">libswresample public header </div></div>
<div class="ttc" id="group__lavu__error_html_gae4bb6f165973d09584e0ec0f335f69ca"><div class="ttname"><a href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a></div><div class="ttdeci">#define AVERROR(e)</div><div class="ttdef"><b>Definition:</b> <a href="error_8h_source.html#l00043">error.h:43</a></div></div>
<div class="ttc" id="group__opt__set__funcs_html_ga3adf7185c21cc080890a5ec02c2e56b2"><div class="ttname"><a href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a></div><div class="ttdeci">int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)</div></div>
<div class="ttc" id="resampling__audio_8c_html_af40a34d598e4ae80bc0539e9f5761c5f"><div class="ttname"><a href="resampling__audio_8c.html#af40a34d598e4ae80bc0539e9f5761c5f">fill_samples</a></div><div class="ttdeci">static void fill_samples(double *dst, int nb_samples, int nb_channels, int sample_rate, double *t)</div><div class="ttdoc">Fill dst buffer with nb_samples, generated starting from t. </div><div class="ttdef"><b>Definition:</b> <a href="resampling__audio_8c_source.html#l00065">resampling_audio.c:65</a></div></div>
<div class="ttc" id="group__lavu__sampfmts_html_ga31b9d149b2de9821a65f4f5612970838"><div class="ttname"><a href="group__lavu__sampfmts.html#ga31b9d149b2de9821a65f4f5612970838">av_get_sample_fmt_name</a></div><div class="ttdeci">const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)</div><div class="ttdoc">Return the name of sample_fmt, or NULL if sample_fmt is not recognized. </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_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="channel__layout_8h_html"><div class="ttname"><a href="channel__layout_8h.html">channel_layout.h</a></div><div class="ttdoc">audio channel layout utility functions </div></div>
<div class="ttc" id="group__lavu__sampfmts_html_ggaf9a51ca15301871723577c730b5865c5adf0f66f21492f8fd5db6debb8b3f932a"><div class="ttname"><a href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5adf0f66f21492f8fd5db6debb8b3f932a">AV_SAMPLE_FMT_U8</a></div><div class="ttdoc">unsigned 8 bits </div><div class="ttdef"><b>Definition:</b> <a href="samplefmt_8h_source.html#l00061">samplefmt.h:61</a></div></div>
<div class="ttc" id="group__lavu__sampfmts_html_ggaf9a51ca15301871723577c730b5865c5ae35a2a6a7593723d9fe4bcefb2876606"><div class="ttname"><a href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ae35a2a6a7593723d9fe4bcefb2876606">AV_SAMPLE_FMT_DBL</a></div><div class="ttdoc">double </div><div class="ttdef"><b>Definition:</b> <a href="samplefmt_8h_source.html#l00065">samplefmt.h:65</a></div></div>
<div class="ttc" id="common_8h_html_a3508a98d3ee7e2c9a4841fe264cf70f7"><div class="ttname"><a href="common_8h.html#a3508a98d3ee7e2c9a4841fe264cf70f7">FF_ARRAY_ELEMS</a></div><div class="ttdeci">#define FF_ARRAY_ELEMS(a)</div><div class="ttdef"><b>Definition:</b> <a href="common_8h_source.html#l00100">common.h:100</a></div></div>
<div class="ttc" id="group__lavu__sampmanip_html_ga4db4c77f928d32c7d8854732f50b8c04"><div class="ttname"><a href="group__lavu__sampmanip.html#ga4db4c77f928d32c7d8854732f50b8c04">av_samples_alloc</a></div><div class="ttdeci">int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)</div><div class="ttdoc">Allocate a samples buffer for nb_samples samples, and fill data pointers and linesize accordingly...</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__lavu__sampfmts_html_gaa7368bc4e3a366b688e81938ed55eb06"><div class="ttname"><a href="group__lavu__sampfmts.html#gaa7368bc4e3a366b688e81938ed55eb06">av_samples_get_buffer_size</a></div><div class="ttdeci">int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)</div><div class="ttdoc">Get the required buffer size for the given audio parameters. </div></div>
<div class="ttc" id="group__lavu__sampfmts_html_ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af"><div class="ttname"><a href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af">AV_SAMPLE_FMT_S16</a></div><div class="ttdoc">signed 16 bits </div><div class="ttdef"><b>Definition:</b> <a href="samplefmt_8h_source.html#l00062">samplefmt.h:62</a></div></div>
<div class="ttc" id="mathematics_8h_html_ae71449b1cc6e6250b91f539153a7a0d3"><div class="ttname"><a href="mathematics_8h.html#ae71449b1cc6e6250b91f539153a7a0d3">M_PI</a></div><div class="ttdeci">#define M_PI</div><div class="ttdef"><b>Definition:</b> <a href="mathematics_8h_source.html#l00046">mathematics.h:46</a></div></div>
<div class="ttc" id="group__opt__set__funcs_html_gad446f7a7b92442e464d43e400e661040"><div class="ttname"><a href="group__opt__set__funcs.html#gad446f7a7b92442e464d43e400e661040">av_opt_set_sample_fmt</a></div><div class="ttdeci">int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat fmt, int search_flags)</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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