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<h1>AsyncAudioCompressor.h</h1><a href="AsyncAudioCompressor_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00027"></a>00027 <span class="preprocessor">#ifndef ASYNC_AUDIO_COMPRESSOR_INCLUDED</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span><span class="preprocessor">#define ASYNC_AUDIO_COMPRESSOR_INCLUDED</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="comment">/****************************************************************************</span>
<a name="l00032"></a>00032 <span class="comment"> *</span>
<a name="l00033"></a>00033 <span class="comment"> * System Includes</span>
<a name="l00034"></a>00034 <span class="comment"> *</span>
<a name="l00035"></a>00035 <span class="comment"> ****************************************************************************/</span>
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="preprocessor">#include <cmath></span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="comment">/****************************************************************************</span>
<a name="l00041"></a>00041 <span class="comment"> *</span>
<a name="l00042"></a>00042 <span class="comment"> * Project Includes</span>
<a name="l00043"></a>00043 <span class="comment"> *</span>
<a name="l00044"></a>00044 <span class="comment"> ****************************************************************************/</span>
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="preprocessor">#include <<a class="code" href="AsyncAudioProcessor_8h.html" title="The base class for an audio processor class.">AsyncAudioProcessor.h</a>></span>
<a name="l00047"></a>00047
<a name="l00048"></a>00048
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="comment">/****************************************************************************</span>
<a name="l00051"></a>00051 <span class="comment"> *</span>
<a name="l00052"></a>00052 <span class="comment"> * Local Includes</span>
<a name="l00053"></a>00053 <span class="comment"> *</span>
<a name="l00054"></a>00054 <span class="comment"> ****************************************************************************/</span>
<a name="l00055"></a>00055
<a name="l00056"></a>00056
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">/****************************************************************************</span>
<a name="l00059"></a>00059 <span class="comment"> *</span>
<a name="l00060"></a>00060 <span class="comment"> * Forward declarations</span>
<a name="l00061"></a>00061 <span class="comment"> *</span>
<a name="l00062"></a>00062 <span class="comment"> ****************************************************************************/</span>
<a name="l00063"></a>00063
<a name="l00064"></a>00064
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="comment">/****************************************************************************</span>
<a name="l00067"></a>00067 <span class="comment"> *</span>
<a name="l00068"></a>00068 <span class="comment"> * Namespace</span>
<a name="l00069"></a>00069 <span class="comment"> *</span>
<a name="l00070"></a>00070 <span class="comment"> ****************************************************************************/</span>
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keyword">namespace </span>Async
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">/****************************************************************************</span>
<a name="l00077"></a>00077 <span class="comment"> *</span>
<a name="l00078"></a>00078 <span class="comment"> * Forward declarations of classes inside of the declared namespace</span>
<a name="l00079"></a>00079 <span class="comment"> *</span>
<a name="l00080"></a>00080 <span class="comment"> ****************************************************************************/</span>
<a name="l00081"></a>00081
<a name="l00082"></a>00082
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">/****************************************************************************</span>
<a name="l00085"></a>00085 <span class="comment"> *</span>
<a name="l00086"></a>00086 <span class="comment"> * Defines & typedefs</span>
<a name="l00087"></a>00087 <span class="comment"> *</span>
<a name="l00088"></a>00088 <span class="comment"> ****************************************************************************/</span>
<a name="l00089"></a>00089
<a name="l00090"></a>00090
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="comment">/****************************************************************************</span>
<a name="l00093"></a>00093 <span class="comment"> *</span>
<a name="l00094"></a>00094 <span class="comment"> * Exported Global Variables</span>
<a name="l00095"></a>00095 <span class="comment"> *</span>
<a name="l00096"></a>00096 <span class="comment"> ****************************************************************************/</span>
<a name="l00097"></a>00097
<a name="l00098"></a>00098
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="comment">/****************************************************************************</span>
<a name="l00101"></a>00101 <span class="comment"> *</span>
<a name="l00102"></a>00102 <span class="comment"> * Class definitions</span>
<a name="l00103"></a>00103 <span class="comment"> *</span>
<a name="l00104"></a>00104 <span class="comment"> ****************************************************************************/</span>
<a name="l00105"></a>00105
<a name="l00106"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html">00106</a> <span class="keyword">class </span><a class="code" href="classAsync_1_1EnvelopeDetector.html">EnvelopeDetector</a>
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108 <span class="keyword">public</span>:
<a name="l00109"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html#a38b5e06a50c1215649bd222a6881ce95">00109</a> <a class="code" href="classAsync_1_1EnvelopeDetector.html#a38b5e06a50c1215649bd222a6881ce95">EnvelopeDetector</a>( <span class="keywordtype">double</span> ms = 1.0, <span class="keywordtype">double</span> sampleRate = INTERNAL_SAMPLE_RATE )
<a name="l00110"></a>00110 : sampleRate_( sampleRate ), ms_( ms ), coef_( 0.0 )
<a name="l00111"></a>00111 {
<a name="l00112"></a>00112 setCoef();
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114
<a name="l00115"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html#ae43975161254850b50a473f9778d709d">00115</a> <span class="keyword">virtual</span> <a class="code" href="classAsync_1_1EnvelopeDetector.html#ae43975161254850b50a473f9778d709d">~EnvelopeDetector</a>() {}
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="comment">// time constant</span>
<a name="l00118"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html#a072b81e2a07dc08fefbc865c17a152ce">00118</a> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1EnvelopeDetector.html#a072b81e2a07dc08fefbc865c17a152ce">setTc</a>( <span class="keywordtype">double</span> ms )
<a name="l00119"></a>00119 {
<a name="l00120"></a>00120 ms_ = ms;
<a name="l00121"></a>00121 setCoef();
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html#a790b2ee943fcabdce59279a1fe2856b6">00124</a> <span class="keyword">virtual</span> <span class="keywordtype">double</span> <a class="code" href="classAsync_1_1EnvelopeDetector.html#a790b2ee943fcabdce59279a1fe2856b6">getTc</a>( <span class="keywordtype">void</span> ) { <span class="keywordflow">return</span> ms_; }
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="comment">// sample rate</span>
<a name="l00127"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html#ac61e6d5ea26a51fda22ebc1c1733073f">00127</a> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1EnvelopeDetector.html#ac61e6d5ea26a51fda22ebc1c1733073f">setSampleRate</a>( <span class="keywordtype">double</span> sampleRate )
<a name="l00128"></a>00128 {
<a name="l00129"></a>00129 sampleRate_ = sampleRate;
<a name="l00130"></a>00130 setCoef();
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132
<a name="l00133"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html#ad7e7d44637b4f42f8037c639aaaeee14">00133</a> <span class="keyword">virtual</span> <span class="keywordtype">double</span> <a class="code" href="classAsync_1_1EnvelopeDetector.html#ad7e7d44637b4f42f8037c639aaaeee14">getSampleRate</a>( <span class="keywordtype">void</span> ) { <span class="keywordflow">return</span> sampleRate_; }
<a name="l00134"></a>00134
<a name="l00135"></a>00135 <span class="comment">// runtime function</span>
<a name="l00136"></a><a class="code" href="classAsync_1_1EnvelopeDetector.html#a70c2fe393135175261fd101c0ef71e69">00136</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1EnvelopeDetector.html#a70c2fe393135175261fd101c0ef71e69">run</a>( <span class="keywordtype">double</span> in, <span class="keywordtype">double</span> &state )
<a name="l00137"></a>00137 {
<a name="l00138"></a>00138 state = in + coef_ * ( state - in );
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keyword">private</span>:
<a name="l00142"></a>00142 <span class="keywordtype">double</span> sampleRate_; <span class="comment">// sample rate</span>
<a name="l00143"></a>00143 <span class="keywordtype">double</span> ms_; <span class="comment">// time constant in ms</span>
<a name="l00144"></a>00144 <span class="keywordtype">double</span> coef_; <span class="comment">// runtime coefficient</span>
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="keywordtype">void</span> setCoef( <span class="keywordtype">void</span> ) <span class="comment">// coef algorithm</span>
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148 coef_ = exp( -1.0 / ( 0.001 * ms_ * sampleRate_ ) );
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150
<a name="l00151"></a>00151 }; <span class="comment">// end EnvelopeDetector class</span>
<a name="l00152"></a>00152
<a name="l00153"></a>00153
<a name="l00154"></a>00154
<a name="l00155"></a>00155
<a name="l00156"></a>00156
<a name="l00169"></a><a class="code" href="classAsync_1_1AudioCompressor.html">00169</a> <span class="keyword">class </span><a class="code" href="classAsync_1_1AudioCompressor.html" title="A class to do audio compression/limiting.">AudioCompressor</a> : <span class="keyword">public</span> <a class="code" href="classAsync_1_1AudioProcessor.html" title="The base class for an audio processor.">AudioProcessor</a>
<a name="l00170"></a>00170 {
<a name="l00171"></a>00171 <span class="keyword">public</span>:
<a name="l00175"></a>00175 <a class="code" href="classAsync_1_1AudioCompressor.html#ae17aafba5a7382a9ddd755346d2751c1" title="Default constuctor.">AudioCompressor</a>(<span class="keywordtype">void</span>);
<a name="l00176"></a>00176
<a name="l00180"></a>00180 <a class="code" href="classAsync_1_1AudioCompressor.html#a7014ea578f1bf870e8db3b7afeccf534" title="Destructor.">~AudioCompressor</a>(<span class="keywordtype">void</span>);
<a name="l00181"></a>00181
<a name="l00189"></a><a class="code" href="classAsync_1_1AudioCompressor.html#aa2e5ed69261053a7f6a1ee8c9d8d69e9">00189</a> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1AudioCompressor.html#aa2e5ed69261053a7f6a1ee8c9d8d69e9" title="Set the compression threshold.">setThreshold</a>(<span class="keywordtype">double</span> thresh_db) { threshdB_ = thresh_db; }
<a name="l00190"></a>00190
<a name="l00195"></a><a class="code" href="classAsync_1_1AudioCompressor.html#a2a733dc6f08915c6c7daaf63b17133ef">00195</a> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1AudioCompressor.html#a2a733dc6f08915c6c7daaf63b17133ef" title="Set the compression ratio.">setRatio</a>(<span class="keywordtype">double</span> ratio) { ratio_ = ratio; }
<a name="l00196"></a>00196
<a name="l00201"></a><a class="code" href="classAsync_1_1AudioCompressor.html#a98e17836146463254b295bacab75bfb7">00201</a> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1AudioCompressor.html#a98e17836146463254b295bacab75bfb7" title="Set the compressor attack time.">setAttack</a>(<span class="keywordtype">double</span> attack_ms) { att_.<a class="code" href="classAsync_1_1EnvelopeDetector.html#a072b81e2a07dc08fefbc865c17a152ce">setTc</a>(attack_ms);}
<a name="l00202"></a>00202
<a name="l00207"></a><a class="code" href="classAsync_1_1AudioCompressor.html#a03ce211a5ec025391881a5c13b550fc2">00207</a> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1AudioCompressor.html#a03ce211a5ec025391881a5c13b550fc2" title="Set the compressor decay time.">setDecay</a>(<span class="keywordtype">double</span> decay_ms) { rel_.<a class="code" href="classAsync_1_1EnvelopeDetector.html#a072b81e2a07dc08fefbc865c17a152ce">setTc</a>(decay_ms); }
<a name="l00208"></a>00208
<a name="l00217"></a>00217 <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1AudioCompressor.html#ae4c70c72b06a265b1e42174e29db9745" title="Set the output gain.">setOutputGain</a>(<span class="keywordtype">float</span> gain);
<a name="l00218"></a>00218
<a name="l00222"></a>00222 <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1AudioCompressor.html#a9365703d0c65c8de53c0a29785a05878" title="Reset the compressor.">reset</a>(<span class="keywordtype">void</span>);
<a name="l00223"></a>00223
<a name="l00224"></a>00224
<a name="l00225"></a>00225 <span class="keyword">protected</span>:
<a name="l00226"></a>00226 <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classAsync_1_1AudioCompressor.html#aef62f704d4f3c108eec1ffec20006b8f" title="Process incoming samples and put them into the output buffer.">processSamples</a>(<span class="keywordtype">float</span> *dest, <span class="keyword">const</span> <span class="keywordtype">float</span> *src, <span class="keywordtype">int</span> count);
<a name="l00227"></a>00227
<a name="l00228"></a>00228
<a name="l00229"></a>00229 <span class="keyword">private</span>:
<a name="l00230"></a>00230 <span class="comment">// transfer function</span>
<a name="l00231"></a>00231 <span class="keywordtype">double</span> threshdB_; <span class="comment">// threshold (dB)</span>
<a name="l00232"></a>00232 <span class="keywordtype">double</span> ratio_; <span class="comment">// ratio (compression: < 1 ; expansion: > 1)</span>
<a name="l00233"></a>00233 <span class="keywordtype">double</span> output_gain;
<a name="l00234"></a>00234
<a name="l00235"></a>00235 <span class="comment">// attack/release</span>
<a name="l00236"></a>00236 <a class="code" href="classAsync_1_1EnvelopeDetector.html">EnvelopeDetector</a> att_; <span class="comment">// attack</span>
<a name="l00237"></a>00237 <a class="code" href="classAsync_1_1EnvelopeDetector.html">EnvelopeDetector</a> rel_; <span class="comment">// release</span>
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="comment">// runtime variables</span>
<a name="l00240"></a>00240 <span class="keywordtype">double</span> envdB_; <span class="comment">// over-threshold envelope (dB)</span>
<a name="l00241"></a>00241
<a name="l00242"></a>00242 <a class="code" href="classAsync_1_1AudioCompressor.html#ae17aafba5a7382a9ddd755346d2751c1" title="Default constuctor.">AudioCompressor</a>(<span class="keyword">const</span> <a class="code" href="classAsync_1_1AudioCompressor.html" title="A class to do audio compression/limiting.">AudioCompressor</a>&);
<a name="l00243"></a>00243 <a class="code" href="classAsync_1_1AudioCompressor.html" title="A class to do audio compression/limiting.">AudioCompressor</a>& operator=(<span class="keyword">const</span> <a class="code" href="classAsync_1_1AudioCompressor.html" title="A class to do audio compression/limiting.">AudioCompressor</a>&);
<a name="l00244"></a>00244
<a name="l00245"></a>00245 }; <span class="comment">/* class AudioCompressor */</span>
<a name="l00246"></a>00246
<a name="l00247"></a>00247
<a name="l00248"></a>00248 } <span class="comment">/* namespace */</span>
<a name="l00249"></a>00249
<a name="l00250"></a>00250 <span class="preprocessor">#endif </span><span class="comment">/* ASYNC_AUDIO_COMPRESSOR_INCLUDED */</span>
<a name="l00251"></a>00251
<a name="l00252"></a>00252
<a name="l00253"></a>00253
<a name="l00254"></a>00254 <span class="comment">/*</span>
<a name="l00255"></a>00255 <span class="comment"> * This file has not been truncated</span>
<a name="l00256"></a>00256 <span class="comment"> */</span>
<a name="l00257"></a>00257
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