arduino/arduino-audio-tools
1
0
Fork 0
mirror of https://github.com/pschatzmann/arduino-audio-tools.git synced 2024-09-21 10:27:27 +00:00
Code Issues Packages Projects Releases Wiki Activity
doxygen
arduino-audio-tools/_codec_m_p3_mini_8h_source.html

254 lines
32 KiB
HTML
Raw Permalink Blame History

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.9.1"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>arduino-audio-tools: src/AudioCodecs/CodecMP3Mini.h Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/searchdata.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectalign" style="padding-left: 0.5em;">
<div id="projectname">arduino-audio-tools
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.9.1 -->
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&amp;dn=gpl-2.0.txt GPL-v2 */
var searchBox = new SearchBox("searchBox", "search",false,'Search','.html');
/* @license-end */
</script>
<script type="text/javascript" src="menudata.js"></script>
<script type="text/javascript" src="menu.js"></script>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&amp;dn=gpl-2.0.txt GPL-v2 */
$(function() {
initMenu('',true,false,'search.php','Search');
$(document).ready(function() { init_search(); });
});
/* @license-end */</script>
<div id="main-nav"></div>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<div id="nav-path" class="navpath">
<ul>
<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><a class="el" href="dir_4ec9d77512f7dc251cf792921c77b104.html">AudioCodecs</a></li> </ul>
</div>
</div><!-- top -->
<div class="header">
<div class="headertitle">
<div class="title">CodecMP3Mini.h</div> </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160; </div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="preprocessor">#define MINIMP3_NO_STDIO</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">//#define MINIMP3_NO_SIMD</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">//#define MINIMP3_IMPLEMENTATION</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">//#define MINIMP3_ONLY_MP3 </span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">//#define MINIMP3_FLOAT_OUTPUT</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160; </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#ifndef MINIMP3_MAX_SAMPLE_RATE</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#define MINIMP3_MAX_SAMPLE_RATE 44100</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160; </div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &quot;AudioCodecs/AudioCodecsBase.h&quot;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &quot;minimp3.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160; </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceaudio__tools.html">audio_tools</a> {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; </div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html"> 28</a></span>&#160;<span class="keyword">class </span><a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html">MP3DecoderMini</a> : <span class="keyword">public</span> <a class="code" href="classaudio__tools_1_1_audio_decoder.html">AudioDecoder</a> {</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html">MP3DecoderMini</a>() = <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; </div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a8e661f75a67450958a20f7436a871109"> 33</a></span>&#160; <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a8e661f75a67450958a20f7436a871109">~MP3DecoderMini</a>() {</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="keywordflow">if</span> (active) {</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#aaf81d3fdaf258088d7692fa70cece087">end</a>();</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; }</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; }</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keywordtype">void</span> setBufferLength(<span class="keywordtype">int</span> len) { buffer_size = len; }</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; </div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a601fb7cf1fc15db50c71a826f084f934"> 42</a></span>&#160; <span class="keywordtype">bool</span> <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a601fb7cf1fc15db50c71a826f084f934">begin</a>() {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; TRACED();</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="comment">//esp_task_wdt_delete(nullptr);</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; ::mp3dec_init(&amp;mp3d);</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; buffer.resize(buffer_size);</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; pcm.resize(MINIMP3_MAX_SAMPLES_PER_FRAME);</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; buffer_pos = 0;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; active = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; }</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; </div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#aaf81d3fdaf258088d7692fa70cece087"> 54</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#aaf81d3fdaf258088d7692fa70cece087">end</a>() {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; TRACED();</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#adac116554b543b7c4228c018a85882f5">flush</a>();</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; active = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; </div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a46f2c85361f5459bb6a58dc28dc3ee9a"> 61</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a46f2c85361f5459bb6a58dc28dc3ee9a">setOutput</a>(<a class="code" href="classaudio__tools_1_1_print.html">Print</a> &amp;outStream) { this-&gt;out = &amp;outStream; }</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#afd7270e10d851383ff7b53c1241f6ba1"> 64</a></span>&#160; <span class="keywordtype">size_t</span> <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#afd7270e10d851383ff7b53c1241f6ba1">write</a>(<span class="keyword">const</span> uint8_t *data, <span class="keywordtype">size_t</span> len) {</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; LOGD(<span class="stringliteral">&quot;write: %zu&quot;</span>, len);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordflow">if</span> (active) {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">if</span> (buffer_pos+len&gt;=buffer.size()){</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#ae5f4be3ed9889ce9be7fcd69f0668e34">decode</a>(len);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; }</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; assert(buffer_pos+len&lt;buffer.size()); </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; memcpy(buffer.data()+buffer_pos, data, len);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; buffer_pos += len; </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; }</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordflow">return</span> len;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; }</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; </div>
<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#adac116554b543b7c4228c018a85882f5"> 78</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#adac116554b543b7c4228c018a85882f5">flush</a>() {</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="comment">// decode the full buffer</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#ae5f4be3ed9889ce9be7fcd69f0668e34">decode</a>(0);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; buffer_pos = 0;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; </div>
<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a0d52c0ed98e047d782054fa126b281e5"> 85</a></span>&#160; <span class="keyword">virtual</span> <span class="keyword">operator</span> bool() { <span class="keywordflow">return</span> active; }</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="keywordtype">void</span> setSampleRateLimit(<span class="keywordtype">int</span> limit){</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; sample_rate_limit = limit;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; }</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; Print *out = <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; mp3dec_t mp3d;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; mp3dec_frame_info_t mp3dec_info;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordtype">size_t</span> buffer_size = 5 * 1024;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; <span class="keywordtype">size_t</span> buffer_pos = 0;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; Vector&lt;uint8_t&gt; buffer;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; Vector&lt;mp3d_sample_t&gt; pcm;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;<span class="preprocessor"> #ifdef MINIMP3_FLOAT_OUTPUT</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; Vector&lt;int16_t&gt; pcm16;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;<span class="preprocessor"> #endif</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordtype">bool</span> active;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordtype">int</span> sample_rate_limit = MINIMP3_MAX_SAMPLE_RATE; <span class="comment">//32000;</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; </div>
<div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#ae5f4be3ed9889ce9be7fcd69f0668e34"> 106</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#ae5f4be3ed9889ce9be7fcd69f0668e34">decode</a>(<span class="keywordtype">int</span> write_len) {</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; LOGD(<span class="stringliteral">&quot;decode: %zd &quot;</span>, buffer_pos);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keywordtype">int</span> open = buffer_pos;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keywordtype">int</span> processed = 0;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="keywordtype">int</span> samples;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keywordflow">do</span> {</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="comment">// decode data</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; samples = ::mp3dec_decode_frame(&amp;mp3d, buffer.data()+processed, open,</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; pcm.data(), &amp;mp3dec_info);</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; LOGD(<span class="stringliteral">&quot;frame_offset: %d - frame_bytes: %d -&gt; samples %d&quot;</span>, mp3dec_info.frame_offset, mp3dec_info.frame_bytes, samples);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; open -= mp3dec_info.frame_bytes;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; processed += mp3dec_info.frame_bytes;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <span class="comment">// output decoding result</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="keywordflow">if</span> (samples &gt; 0) {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a9be6d1c58efaa750c8ad9f151d75bbd8">provideResult</a>(samples);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; } </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <span class="comment">// process until we have space for the next write</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; } <span class="keywordflow">while</span>(processed &lt; write_len);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; <span class="comment">// save unprocessed data</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; buffer_pos = open;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; memmove(buffer.data(),buffer.data()+processed, open);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; </div>
<div class="line"><a name="l00131"></a><span class="lineno"><a class="line" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a9be6d1c58efaa750c8ad9f151d75bbd8"> 131</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classaudio__tools_1_1_m_p3_decoder_mini.html#a9be6d1c58efaa750c8ad9f151d75bbd8">provideResult</a>(<span class="keywordtype">int</span> samples) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; LOGD(<span class="stringliteral">&quot;provideResult: %d samples&quot;</span>, samples);</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; <a class="code" href="structaudio__tools_1_1_audio_info.html">AudioInfo</a> tmp;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; tmp.<a class="code" href="structaudio__tools_1_1_audio_info.html#a0e86c53dfa0ad5dc0d2ecd0304fabc95">sample_rate</a> = mp3dec_info.hz&gt;sample_rate_limit ? sample_rate_limit : mp3dec_info.hz;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; tmp.<a class="code" href="structaudio__tools_1_1_audio_info.html#a1ac7822956f57069d76da865d6b33c55">channels</a> = mp3dec_info.channels;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; tmp.<a class="code" href="structaudio__tools_1_1_audio_info.html#aa65c89fa8336bfdc4f8d916d9d415a9f">bits_per_sample</a> = 16;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; <span class="comment">// notify about audio changes</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; <span class="keywordflow">if</span> (tmp != info) {</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; tmp.logInfo();</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; notifyAudioChange(tmp);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; }</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; <span class="comment">// store last info so that we can detect any changes</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; info = info;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; </div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; <span class="comment">// provide result pwm data</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; <span class="keywordflow">if</span> (out != <span class="keyword">nullptr</span>) {</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160;<span class="preprocessor"> #ifdef MINIMP3_FLOAT_OUTPUT</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; pcm16.resize(samples);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; f32_to_s16(pcm.data(), pcm16.data(), samples);</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; out-&gt;write((uint8_t *)pcm16.data(), samples * <span class="keyword">sizeof</span>(int16_t));</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160;<span class="preprocessor"> #else</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; out-&gt;write((uint8_t *)pcm.data(), samples * <span class="keyword">sizeof</span>(mp3d_sample_t));</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160;<span class="preprocessor"> #endif</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; }</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; }</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; <span class="keywordtype">void</span> f32_to_s16(<span class="keywordtype">float</span> *in, int16_t *out, <span class="keywordtype">int</span> num_samples) {</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; <span class="keywordtype">int</span> i = 0;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keywordflow">for</span>(; i &lt; num_samples; i++){</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <span class="keywordtype">float</span> sample = in[i] * 32768.0f;</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; <span class="keywordflow">if</span> (sample &gt;= 32766.5f)</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; out[i] = (int16_t) 32767;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; <span class="keywordflow">else</span> <span class="keywordflow">if</span> (sample &lt;= -32767.5f)</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; out[i] = (int16_t)-32768;</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; int16_t s = (int16_t)(sample + .5f);</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; s -= (s &lt; 0); <span class="comment">/* away from zero, to be compliant */</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; out[i] = s;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; }</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; }</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; }</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; </div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; </div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160;};</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; </div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;} <span class="comment">// namespace audio_tools</span></div>
<div class="ttc" id="aclassaudio__tools_1_1_audio_decoder_html"><div class="ttname"><a href="classaudio__tools_1_1_audio_decoder.html">audio_tools::AudioDecoder</a></div><div class="ttdoc">Docoding of encoded audio into PCM data.</div><div class="ttdef"><b>Definition:</b> AudioCodecsBase.h:16</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html">audio_tools::MP3DecoderMini</a></div><div class="ttdoc">MP3 Decoder using https://github.com/pschatzmann/minimp3. This decoder does not provide any good resu...</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:28</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_a46f2c85361f5459bb6a58dc28dc3ee9a"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#a46f2c85361f5459bb6a58dc28dc3ee9a">audio_tools::MP3DecoderMini::setOutput</a></div><div class="ttdeci">void setOutput(Print &amp;outStream)</div><div class="ttdoc">Defines the output Stream.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:61</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_a601fb7cf1fc15db50c71a826f084f934"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#a601fb7cf1fc15db50c71a826f084f934">audio_tools::MP3DecoderMini::begin</a></div><div class="ttdeci">bool begin()</div><div class="ttdoc">Starts the processing.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:42</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_a8e661f75a67450958a20f7436a871109"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#a8e661f75a67450958a20f7436a871109">audio_tools::MP3DecoderMini::~MP3DecoderMini</a></div><div class="ttdeci">~MP3DecoderMini()</div><div class="ttdoc">Destroy the MP3DecoderMini object.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:33</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_a9be6d1c58efaa750c8ad9f151d75bbd8"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#a9be6d1c58efaa750c8ad9f151d75bbd8">audio_tools::MP3DecoderMini::provideResult</a></div><div class="ttdeci">void provideResult(int samples)</div><div class="ttdoc">Provides Metadata and PCM data.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:131</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_aaf81d3fdaf258088d7692fa70cece087"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#aaf81d3fdaf258088d7692fa70cece087">audio_tools::MP3DecoderMini::end</a></div><div class="ttdeci">void end()</div><div class="ttdoc">Releases the reserved memory.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:54</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_adac116554b543b7c4228c018a85882f5"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#adac116554b543b7c4228c018a85882f5">audio_tools::MP3DecoderMini::flush</a></div><div class="ttdeci">void flush()</div><div class="ttdoc">Decodes the last outstanding data.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:78</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_ae5f4be3ed9889ce9be7fcd69f0668e34"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#ae5f4be3ed9889ce9be7fcd69f0668e34">audio_tools::MP3DecoderMini::decode</a></div><div class="ttdeci">void decode(int write_len)</div><div class="ttdoc">Process single bytes so that we can decode a full frame when it is available.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:106</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_m_p3_decoder_mini_html_afd7270e10d851383ff7b53c1241f6ba1"><div class="ttname"><a href="classaudio__tools_1_1_m_p3_decoder_mini.html#afd7270e10d851383ff7b53c1241f6ba1">audio_tools::MP3DecoderMini::write</a></div><div class="ttdeci">size_t write(const uint8_t *data, size_t len)</div><div class="ttdoc">Write mp3 data to decoder.</div><div class="ttdef"><b>Definition:</b> CodecMP3Mini.h:64</div></div>
<div class="ttc" id="aclassaudio__tools_1_1_print_html"><div class="ttname"><a href="classaudio__tools_1_1_print.html">audio_tools::Print</a></div><div class="ttdef"><b>Definition:</b> NoArduino.h:58</div></div>
<div class="ttc" id="anamespaceaudio__tools_html"><div class="ttname"><a href="namespaceaudio__tools.html">audio_tools</a></div><div class="ttdoc">Generic Implementation of sound input and output for desktop environments using portaudio.</div><div class="ttdef"><b>Definition:</b> AnalogAudioArduino.h:12</div></div>
<div class="ttc" id="astructaudio__tools_1_1_audio_info_html"><div class="ttname"><a href="structaudio__tools_1_1_audio_info.html">audio_tools::AudioInfo</a></div><div class="ttdoc">Basic Audio information which drives e.g. I2S.</div><div class="ttdef"><b>Definition:</b> AudioTypes.h:50</div></div>
<div class="ttc" id="astructaudio__tools_1_1_audio_info_html_a0e86c53dfa0ad5dc0d2ecd0304fabc95"><div class="ttname"><a href="structaudio__tools_1_1_audio_info.html#a0e86c53dfa0ad5dc0d2ecd0304fabc95">audio_tools::AudioInfo::sample_rate</a></div><div class="ttdeci">sample_rate_t sample_rate</div><div class="ttdoc">Sample Rate: e.g 44100.</div><div class="ttdef"><b>Definition:</b> AudioTypes.h:53</div></div>
<div class="ttc" id="astructaudio__tools_1_1_audio_info_html_a1ac7822956f57069d76da865d6b33c55"><div class="ttname"><a href="structaudio__tools_1_1_audio_info.html#a1ac7822956f57069d76da865d6b33c55">audio_tools::AudioInfo::channels</a></div><div class="ttdeci">uint16_t channels</div><div class="ttdoc">Number of channels: 2=stereo, 1=mono.</div><div class="ttdef"><b>Definition:</b> AudioTypes.h:55</div></div>
<div class="ttc" id="astructaudio__tools_1_1_audio_info_html_aa65c89fa8336bfdc4f8d916d9d415a9f"><div class="ttname"><a href="structaudio__tools_1_1_audio_info.html#aa65c89fa8336bfdc4f8d916d9d415a9f">audio_tools::AudioInfo::bits_per_sample</a></div><div class="ttdeci">uint8_t bits_per_sample</div><div class="ttdoc">Number of bits per sample (int16_t = 16 bits)</div><div class="ttdef"><b>Definition:</b> AudioTypes.h:57</div></div>
</div><!-- fragment --></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by&#160;<a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.1
</small></address>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink