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DISTRHO Plugin Framework
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  65. <div class="title">DISTRHO Plugin Framework </div>  </div>

  66. </div><!--header-->

  67. <div class="contents">

  68. <div class="textblock"><p>DISTRHO Plugin Framework (or <b>DPF</b> for short) is a plugin framework designed to make development of new plugins an easy and enjoyable task.<br  />

  69. It allows developers to create plugins with custom UIs using a simple C++ API.<br  />

  70. The framework facilitates exporting various different plugin formats from the same code-base.</p>

  71. <p>DPF can build for LADSPA, DSSI, LV2, VST2, VST3 and CLAP formats.<br  />

  72. A JACK/Standalone mode is also available, allowing you to quickly test plugins.</p>

  73. <h1><a class="anchor" id="Macros"></a>

  74. Macros</h1>

  75. <p>You start by creating a "DistrhoPluginInfo.h" file describing the plugin via macros, see PluginMacros.<br  />

  76.  This file is included during compilation of the main DPF code to select which features to activate for each plugin format.</p>

  77. <p>For example, a plugin (with UI) that use states will require LV2 hosts to support Atom and Worker extensions for message passing from the UI to the (DSP) plugin.<br  />

  78. If your plugin does not make use of states, the Worker extension is not set as a required feature.</p>

  79. <h1><a class="anchor" id="Plugin"></a>

  80. Plugin</h1>

  81. <p>The next step is to create your plugin code by subclassing DPF's <a class="el" href="classPlugin.html">Plugin</a> class.<br  />

  82. You need to pass the number of parameters in the constructor and also the number of programs and states, if any.</p>

  83. <p>Do note all of DPF code is within its own C++ namespace (<b>DISTRHO</b> for DSP/plugin stuff, <b>DGL</b> for <a class="el" href="classUI.html">UI</a> stuff).<br  />

  84. You can use <a class="el" href="group__NamespaceMacros.html#gac4cb97c393d20c28ba19365d844341cd">START_NAMESPACE_DISTRHO</a> / <a class="el" href="group__NamespaceMacros.html#ga3ff541a449593e069a29e92d21e38ef3">END_NAMESPACE_DISTRHO</a> combo around your code, or globally set USE_NAMESPACE_DISTRHO.<br  />

  85.  These are defined as compiler macros so that you can override the namespace name during build. When in doubt, just follow the examples.</p>

  86. <h1><a class="anchor" id="Examples"></a>

  87. Examples</h1>

  88. <p>Let's begin with some examples.<br  />

  89. Here is one of a stereo audio plugin that simply mutes the host output: </p><div class="fragment"><div class="line"><span class="comment">/* DPF plugin include */</span></div>

  90. <div class="line"><span class="preprocessor">#include &quot;DistrhoPlugin.hpp&quot;</span></div>

  91. <div class="line"> </div>

  92. <div class="line"><span class="comment">/* Make DPF related classes available for us to use without any extra namespace references */</span></div>

  93. <div class="line"><a class="code" href="group__NamespaceMacros.html#gadcd7e7d900fbae0fa1a71d6fbab4d59c">USE_NAMESPACE_DISTRHO</a>;</div>

  94. <div class="line"><span class="comment"></span> </div>

  95. <div class="line"><span class="comment">/**</span></div>

  96. <div class="line"><span class="comment">   Our custom plugin class.</span></div>

  97. <div class="line"><span class="comment">   Subclassing `Plugin` from DPF is how this all works.</span></div>

  98. <div class="line"><span class="comment"></span> </div>

  99. <div class="line"><span class="comment">   By default, only information-related functions and `run` are pure virtual (that is, must be reimplemented).</span></div>

  100. <div class="line"><span class="comment">   When enabling certain features (such as programs or states, more on that below), a few extra functions also need to be reimplemented.</span></div>

  101. <div class="line"><span class="comment"> */</span></div>

  102. <div class="line"><span class="keyword">class </span>MutePlugin : <span class="keyword">public</span> <a class="code" href="classPlugin.html">Plugin</a></div>

  103. <div class="line">{</div>

  104. <div class="line"><span class="keyword">public</span>:<span class="comment"></span></div>

  105. <div class="line"><span class="comment">  /**</span></div>

  106. <div class="line"><span class="comment">     Plugin class constructor.</span></div>

  107. <div class="line"><span class="comment">   */</span></div>

  108. <div class="line">   MutePlugin()</div>

  109. <div class="line">       : <a class="code" href="classPlugin.html">Plugin</a>(0, 0, 0) <span class="comment">// 0 parameters, 0 programs and 0 states</span></div>

  110. <div class="line">   {</div>

  111. <div class="line">   }</div>

  112. <div class="line"> </div>

  113. <div class="line"><span class="keyword">protected</span>:</div>

  114. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  115. <div class="line"><span class="comment">   * Information */</span></div>

  116. <div class="line"><span class="comment"></span> </div>

  117. <div class="line"><span class="comment">  /**</span></div>

  118. <div class="line"><span class="comment">     Get the plugin label.</span></div>

  119. <div class="line"><span class="comment">     This label is a short restricted name consisting of only _, a-z, A-Z and 0-9 characters.</span></div>

  120. <div class="line"><span class="comment">   */</span></div>

  121. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a00f7945c16149db6845fbcc2af729f4f">getLabel</a>()<span class="keyword"> const override</span></div>

  122. <div class="line"><span class="keyword">   </span>{</div>

  123. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;Mute&quot;</span>;</div>

  124. <div class="line">   }</div>

  125. <div class="line"><span class="comment"></span> </div>

  126. <div class="line"><span class="comment">  /**</span></div>

  127. <div class="line"><span class="comment">     Get the plugin author/maker.</span></div>

  128. <div class="line"><span class="comment">   */</span></div>

  129. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a955832840de786a7a22798f0ef451c5d">getMaker</a>()<span class="keyword"> const override</span></div>

  130. <div class="line"><span class="keyword">   </span>{</div>

  131. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;DPF&quot;</span>;</div>

  132. <div class="line">   }</div>

  133. <div class="line"><span class="comment"></span> </div>

  134. <div class="line"><span class="comment">  /**</span></div>

  135. <div class="line"><span class="comment">     Get the plugin license name (a single line of text).</span></div>

  136. <div class="line"><span class="comment">     For commercial plugins this should return some short copyright information.</span></div>

  137. <div class="line"><span class="comment">   */</span></div>

  138. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a686a3c92a376a185d6fd97efd59125d1">getLicense</a>()<span class="keyword"> const override</span></div>

  139. <div class="line"><span class="keyword">   </span>{</div>

  140. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;MIT&quot;</span>;</div>

  141. <div class="line">   }</div>

  142. <div class="line"><span class="comment"></span> </div>

  143. <div class="line"><span class="comment">  /**</span></div>

  144. <div class="line"><span class="comment">     Get the plugin version, in hexadecimal.</span></div>

  145. <div class="line"><span class="comment">   */</span></div>

  146. <div class="line">   uint32_t <a class="code" href="classPlugin.html#abae540dd93caf4834270358a8aad334a">getVersion</a>()<span class="keyword"> const override</span></div>

  147. <div class="line"><span class="keyword">   </span>{</div>

  148. <div class="line">       <span class="keywordflow">return</span> <a class="code" href="group__MiscellaneousFunctions.html#ga95d67ff74d46b2c80f15c7790a523154">d_version</a>(1, 0, 0);</div>

  149. <div class="line">   }</div>

  150. <div class="line"><span class="comment"></span> </div>

  151. <div class="line"><span class="comment">  /**</span></div>

  152. <div class="line"><span class="comment">     Get the plugin unique Id.</span></div>

  153. <div class="line"><span class="comment">     This value is used by LADSPA, DSSI, VST2 and VST3 plugin formats.</span></div>

  154. <div class="line"><span class="comment">   */</span></div>

  155. <div class="line">   int64_t <a class="code" href="classPlugin.html#ad6ff8c80227d5ceebd40b96f3be29a66">getUniqueId</a>()<span class="keyword"> const override</span></div>

  156. <div class="line"><span class="keyword">   </span>{</div>

  157. <div class="line">       <span class="keywordflow">return</span> <a class="code" href="group__MiscellaneousFunctions.html#ga6827e90feb9bdcb6f76175a245fbf12c">d_cconst</a>(<span class="charliteral">&#39;M&#39;</span>, <span class="charliteral">&#39;u&#39;</span>, <span class="charliteral">&#39;t&#39;</span>, <span class="charliteral">&#39;e&#39;</span>);</div>

  158. <div class="line">   }</div>

  159. <div class="line"> </div>

  160. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  161. <div class="line"><span class="comment">   * Audio/MIDI Processing */</span></div>

  162. <div class="line"><span class="comment"></span> </div>

  163. <div class="line"><span class="comment">  /**</span></div>

  164. <div class="line"><span class="comment">     Run/process function for plugins without MIDI input.</span></div>

  165. <div class="line"><span class="comment">   */</span></div>

  166. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#a0a969c78f8455ac6ba65fa42e8c498f6">run</a>(<span class="keyword">const</span> <span class="keywordtype">float</span>**, <span class="keywordtype">float</span>** outputs, uint32_t frames)<span class="keyword"> override</span></div>

  167. <div class="line"><span class="keyword">   </span>{</div>

  168. <div class="line">       <span class="comment">// get the left and right audio outputs</span></div>

  169. <div class="line">       <span class="keywordtype">float</span>* <span class="keyword">const</span> outL = outputs[0];</div>

  170. <div class="line">       <span class="keywordtype">float</span>* <span class="keyword">const</span> outR = outputs[1];</div>

  171. <div class="line"> </div>

  172. <div class="line">       <span class="comment">// mute audio</span></div>

  173. <div class="line">       std::memset(outL, 0, <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)*frames);</div>

  174. <div class="line">       std::memset(outR, 0, <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)*frames);</div>

  175. <div class="line">   }</div>

  176. <div class="line">};</div>

  177. <div class="line"><span class="comment"></span> </div>

  178. <div class="line"><span class="comment">/**</span></div>

  179. <div class="line"><span class="comment">   Create an instance of the Plugin class.</span></div>

  180. <div class="line"><span class="comment">   This is the entry point for DPF plugins.</span></div>

  181. <div class="line"><span class="comment">   DPF will call this to either create an instance of your plugin for the host or to fetch some initial information for internal caching.</span></div>

  182. <div class="line"><span class="comment"> */</span></div>

  183. <div class="line"><a class="code" href="classPlugin.html">Plugin</a>* <a class="code" href="group__EntryPoints.html#ga87f1fa9084f2490ca04ea733292c6dee">createPlugin</a>()</div>

  184. <div class="line">{</div>

  185. <div class="line">   <span class="keywordflow">return</span> <span class="keyword">new</span> MutePlugin();</div>

  186. <div class="line">}</div>

  187. <div class="ttc" id="aclassPlugin_html"><div class="ttname"><a href="classPlugin.html">Plugin</a></div><div class="ttdef"><b>Definition:</b> DistrhoPlugin.hpp:61</div></div>

  188. <div class="ttc" id="aclassPlugin_html_a00f7945c16149db6845fbcc2af729f4f"><div class="ttname"><a href="classPlugin.html#a00f7945c16149db6845fbcc2af729f4f">Plugin::getLabel</a></div><div class="ttdeci">virtual const char * getLabel() const =0</div></div>

  189. <div class="ttc" id="aclassPlugin_html_a0a969c78f8455ac6ba65fa42e8c498f6"><div class="ttname"><a href="classPlugin.html#a0a969c78f8455ac6ba65fa42e8c498f6">Plugin::run</a></div><div class="ttdeci">virtual void run(const float **inputs, float **outputs, uint32_t frames, const MidiEvent *midiEvents, uint32_t midiEventCount)=0</div></div>

  190. <div class="ttc" id="aclassPlugin_html_a686a3c92a376a185d6fd97efd59125d1"><div class="ttname"><a href="classPlugin.html#a686a3c92a376a185d6fd97efd59125d1">Plugin::getLicense</a></div><div class="ttdeci">virtual const char * getLicense() const =0</div></div>

  191. <div class="ttc" id="aclassPlugin_html_a955832840de786a7a22798f0ef451c5d"><div class="ttname"><a href="classPlugin.html#a955832840de786a7a22798f0ef451c5d">Plugin::getMaker</a></div><div class="ttdeci">virtual const char * getMaker() const =0</div></div>

  192. <div class="ttc" id="aclassPlugin_html_abae540dd93caf4834270358a8aad334a"><div class="ttname"><a href="classPlugin.html#abae540dd93caf4834270358a8aad334a">Plugin::getVersion</a></div><div class="ttdeci">virtual uint32_t getVersion() const =0</div></div>

  193. <div class="ttc" id="aclassPlugin_html_ad6ff8c80227d5ceebd40b96f3be29a66"><div class="ttname"><a href="classPlugin.html#ad6ff8c80227d5ceebd40b96f3be29a66">Plugin::getUniqueId</a></div><div class="ttdeci">virtual int64_t getUniqueId() const =0</div></div>

  194. <div class="ttc" id="agroup__EntryPoints_html_ga87f1fa9084f2490ca04ea733292c6dee"><div class="ttname"><a href="group__EntryPoints.html#ga87f1fa9084f2490ca04ea733292c6dee">createPlugin</a></div><div class="ttdeci">Plugin * createPlugin()</div></div>

  195. <div class="ttc" id="agroup__MiscellaneousFunctions_html_ga6827e90feb9bdcb6f76175a245fbf12c"><div class="ttname"><a href="group__MiscellaneousFunctions.html#ga6827e90feb9bdcb6f76175a245fbf12c">d_cconst</a></div><div class="ttdeci">static constexpr int64_t d_cconst(const uint8_t a, const uint8_t b, const uint8_t c, const uint8_t d) noexcept</div><div class="ttdef"><b>Definition:</b> DistrhoUtils.hpp:72</div></div>

  196. <div class="ttc" id="agroup__MiscellaneousFunctions_html_ga95d67ff74d46b2c80f15c7790a523154"><div class="ttname"><a href="group__MiscellaneousFunctions.html#ga95d67ff74d46b2c80f15c7790a523154">d_version</a></div><div class="ttdeci">static constexpr uint32_t d_version(const uint8_t major, const uint8_t minor, const uint8_t micro) noexcept</div><div class="ttdef"><b>Definition:</b> DistrhoUtils.hpp:90</div></div>

  197. <div class="ttc" id="agroup__NamespaceMacros_html_gadcd7e7d900fbae0fa1a71d6fbab4d59c"><div class="ttname"><a href="group__NamespaceMacros.html#gadcd7e7d900fbae0fa1a71d6fbab4d59c">USE_NAMESPACE_DISTRHO</a></div><div class="ttdeci">#define USE_NAMESPACE_DISTRHO</div><div class="ttdef"><b>Definition:</b> DistrhoInfo.hpp:955</div></div>

  198. </div><!-- fragment --><p>See the <a class="el" href="classPlugin.html">Plugin</a> class for more information.</p>

  199. <h1><a class="anchor" id="Parameters"></a>

  200. Parameters</h1>

  201. <p>A plugin is nothing without parameters.<br  />

  202. In DPF parameters can be inputs or outputs.<br  />

  203. They have hints to describe how they behave plus a name and a symbol identifying them.<br  />

  204. Parameters also have 'ranges' - a minimum, maximum and default value.</p>

  205. <p>Input parameters are by default "read-only": the plugin can read them but not change them. (there are exceptions and possibly a request to the host to change values, more on that below)<br  />

  206. It's the host responsibility to save, restore and set input parameters.</p>

  207. <p>Output parameters can be changed at anytime by the plugin.<br  />

  208. The host will simply read their values and never change them.</p>

  209. <p>Here's an example of an audio plugin that has 1 input parameter: </p><div class="fragment"><div class="line"><span class="keyword">class </span>GainPlugin : <span class="keyword">public</span> <a class="code" href="classPlugin.html">Plugin</a></div>

  210. <div class="line">{</div>

  211. <div class="line"><span class="keyword">public</span>:<span class="comment"></span></div>

  212. <div class="line"><span class="comment">  /**</span></div>

  213. <div class="line"><span class="comment">     Plugin class constructor.</span></div>

  214. <div class="line"><span class="comment">     You must set all parameter values to their defaults, matching ParameterRanges::def.</span></div>

  215. <div class="line"><span class="comment">   */</span></div>

  216. <div class="line">   GainPlugin()</div>

  217. <div class="line">       : <a class="code" href="classPlugin.html">Plugin</a>(1, 0, 0), <span class="comment">// 1 parameter, 0 programs and 0 states</span></div>

  218. <div class="line">         fGain(1.0f)</div>

  219. <div class="line">   {</div>

  220. <div class="line">   }</div>

  221. <div class="line"> </div>

  222. <div class="line"><span class="keyword">protected</span>:</div>

  223. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  224. <div class="line"><span class="comment">   * Information */</span></div>

  225. <div class="line"> </div>

  226. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a00f7945c16149db6845fbcc2af729f4f">getLabel</a>()<span class="keyword"> const override</span></div>

  227. <div class="line"><span class="keyword">   </span>{</div>

  228. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;Gain&quot;</span>;</div>

  229. <div class="line">   }</div>

  230. <div class="line"> </div>

  231. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a955832840de786a7a22798f0ef451c5d">getMaker</a>()<span class="keyword"> const override</span></div>

  232. <div class="line"><span class="keyword">   </span>{</div>

  233. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;DPF&quot;</span>;</div>

  234. <div class="line">   }</div>

  235. <div class="line"> </div>

  236. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a686a3c92a376a185d6fd97efd59125d1">getLicense</a>()<span class="keyword"> const override</span></div>

  237. <div class="line"><span class="keyword">   </span>{</div>

  238. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;MIT&quot;</span>;</div>

  239. <div class="line">   }</div>

  240. <div class="line"> </div>

  241. <div class="line">   uint32_t <a class="code" href="classPlugin.html#abae540dd93caf4834270358a8aad334a">getVersion</a>()<span class="keyword"> const override</span></div>

  242. <div class="line"><span class="keyword">   </span>{</div>

  243. <div class="line">       <span class="keywordflow">return</span> <a class="code" href="group__MiscellaneousFunctions.html#ga95d67ff74d46b2c80f15c7790a523154">d_version</a>(1, 0, 0);</div>

  244. <div class="line">   }</div>

  245. <div class="line"> </div>

  246. <div class="line">   int64_t <a class="code" href="classPlugin.html#ad6ff8c80227d5ceebd40b96f3be29a66">getUniqueId</a>()<span class="keyword"> const override</span></div>

  247. <div class="line"><span class="keyword">   </span>{</div>

  248. <div class="line">       <span class="keywordflow">return</span> <a class="code" href="group__MiscellaneousFunctions.html#ga6827e90feb9bdcb6f76175a245fbf12c">d_cconst</a>(<span class="charliteral">&#39;G&#39;</span>, <span class="charliteral">&#39;a&#39;</span>, <span class="charliteral">&#39;i&#39;</span>, <span class="charliteral">&#39;n&#39;</span>);</div>

  249. <div class="line">   }</div>

  250. <div class="line"> </div>

  251. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  252. <div class="line"><span class="comment">   * Init */</span></div>

  253. <div class="line"><span class="comment"></span> </div>

  254. <div class="line"><span class="comment">  /**</span></div>

  255. <div class="line"><span class="comment">     Initialize a parameter.</span></div>

  256. <div class="line"><span class="comment">     This function will be called once, shortly after the plugin is created.</span></div>

  257. <div class="line"><span class="comment">   */</span></div>

  258. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#aacf87bd0037efeb3b60d204940f3f4a0">initParameter</a>(uint32_t index, <a class="code" href="structParameter.html">Parameter</a>&amp; parameter)<span class="keyword"> override</span></div>

  259. <div class="line"><span class="keyword">   </span>{</div>

  260. <div class="line">       <span class="comment">// we only have one parameter so we can skip checking the index</span></div>

  261. <div class="line"> </div>

  262. <div class="line">       parameter.<a class="code" href="structParameter.html#a397fb977f0c6cbec31df4f141ca3f5b3">hints</a>      = <a class="code" href="group__ParameterHints.html#gaf82d83a105dc418877ef91e84ac6efd3">kParameterIsAutomatable</a>;</div>

  263. <div class="line">       parameter.<a class="code" href="structParameter.html#ae63c1fcfb20e320bada1f58c04ff18da">name</a>       = <span class="stringliteral">&quot;Gain&quot;</span>;</div>

  264. <div class="line">       parameter.<a class="code" href="structParameter.html#a3e546efd8dbd0d77351208b670719468">symbol</a>     = <span class="stringliteral">&quot;gain&quot;</span>;</div>

  265. <div class="line">       parameter.<a class="code" href="structParameter.html#a2d0c81e4fb8fad18d920ef6ecd4a64db">ranges</a>.<a class="code" href="structParameterRanges.html#a63c40988463a8ace9d0e9e55a00f3c7b">min</a> = 0.0f;</div>

  266. <div class="line">       parameter.<a class="code" href="structParameter.html#a2d0c81e4fb8fad18d920ef6ecd4a64db">ranges</a>.<a class="code" href="structParameterRanges.html#a175c78c905c598df929a4450e4d2a2a0">max</a> = 2.0f;</div>

  267. <div class="line">       parameter.<a class="code" href="structParameter.html#a2d0c81e4fb8fad18d920ef6ecd4a64db">ranges</a>.<a class="code" href="structParameterRanges.html#aa0aba68115bcfff25c35b2da2f7aed4c">def</a> = 1.0f;</div>

  268. <div class="line">   }</div>

  269. <div class="line"> </div>

  270. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  271. <div class="line"><span class="comment">   * Internal data */</span></div>

  272. <div class="line"><span class="comment"></span> </div>

  273. <div class="line"><span class="comment">  /**</span></div>

  274. <div class="line"><span class="comment">     Get the current value of a parameter.</span></div>

  275. <div class="line"><span class="comment">   */</span></div>

  276. <div class="line">   <span class="keywordtype">float</span> <a class="code" href="classPlugin.html#af9e9f5438e2e0c2352052eb5f95832aa">getParameterValue</a>(uint32_t index)<span class="keyword"> const override</span></div>

  277. <div class="line"><span class="keyword">   </span>{</div>

  278. <div class="line">       <span class="comment">// same as before, ignore index check</span></div>

  279. <div class="line"> </div>

  280. <div class="line">       <span class="keywordflow">return</span> fGain;</div>

  281. <div class="line">   }</div>

  282. <div class="line"><span class="comment"></span> </div>

  283. <div class="line"><span class="comment">  /**</span></div>

  284. <div class="line"><span class="comment">     Change a parameter value.</span></div>

  285. <div class="line"><span class="comment">   */</span></div>

  286. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#a7e9e26ceafc7603ef6163483a9dc39be">setParameterValue</a>(uint32_t index, <span class="keywordtype">float</span> value)<span class="keyword"> override</span></div>

  287. <div class="line"><span class="keyword">   </span>{</div>

  288. <div class="line">       <span class="comment">// same as before, ignore index check</span></div>

  289. <div class="line"> </div>

  290. <div class="line">       fGain = value;</div>

  291. <div class="line">   }</div>

  292. <div class="line"> </div>

  293. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  294. <div class="line"><span class="comment">   * Audio/MIDI Processing */</span></div>

  295. <div class="line"> </div>

  296. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#a0a969c78f8455ac6ba65fa42e8c498f6">run</a>(<span class="keyword">const</span> <span class="keywordtype">float</span>**, <span class="keywordtype">float</span>** outputs, uint32_t frames)<span class="keyword"> override</span></div>

  297. <div class="line"><span class="keyword">   </span>{</div>

  298. <div class="line">       <span class="comment">// get the mono input and output</span></div>

  299. <div class="line">       <span class="keyword">const</span> <span class="keywordtype">float</span>* <span class="keyword">const</span> in  = inputs[0];</div>

  300. <div class="line">       <span class="comment">/* */</span> <span class="keywordtype">float</span>* <span class="keyword">const</span> out = outputs[0];</div>

  301. <div class="line"> </div>

  302. <div class="line">       <span class="comment">// apply gain against all samples</span></div>

  303. <div class="line">       <span class="keywordflow">for</span> (uint32_t i=0; i &lt; frames; ++i)</div>

  304. <div class="line">           out[i] = in[i] * fGain;</div>

  305. <div class="line">   }</div>

  306. <div class="line"> </div>

  307. <div class="line"><span class="keyword">private</span>:</div>

  308. <div class="line">   <span class="keywordtype">float</span> fGain;</div>

  309. <div class="line">};</div>

  310. <div class="ttc" id="aclassPlugin_html_a7e9e26ceafc7603ef6163483a9dc39be"><div class="ttname"><a href="classPlugin.html#a7e9e26ceafc7603ef6163483a9dc39be">Plugin::setParameterValue</a></div><div class="ttdeci">virtual void setParameterValue(uint32_t index, float value)</div></div>

  311. <div class="ttc" id="aclassPlugin_html_aacf87bd0037efeb3b60d204940f3f4a0"><div class="ttname"><a href="classPlugin.html#aacf87bd0037efeb3b60d204940f3f4a0">Plugin::initParameter</a></div><div class="ttdeci">virtual void initParameter(uint32_t index, Parameter &amp;parameter)</div></div>

  312. <div class="ttc" id="aclassPlugin_html_af9e9f5438e2e0c2352052eb5f95832aa"><div class="ttname"><a href="classPlugin.html#af9e9f5438e2e0c2352052eb5f95832aa">Plugin::getParameterValue</a></div><div class="ttdeci">virtual float getParameterValue(uint32_t index) const</div></div>

  313. <div class="ttc" id="agroup__ParameterHints_html_gaf82d83a105dc418877ef91e84ac6efd3"><div class="ttname"><a href="group__ParameterHints.html#gaf82d83a105dc418877ef91e84ac6efd3">kParameterIsAutomatable</a></div><div class="ttdeci">static constexpr const uint32_t kParameterIsAutomatable</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:96</div></div>

  314. <div class="ttc" id="astructParameterRanges_html_a175c78c905c598df929a4450e4d2a2a0"><div class="ttname"><a href="structParameterRanges.html#a175c78c905c598df929a4450e4d2a2a0">ParameterRanges::max</a></div><div class="ttdeci">float max</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:338</div></div>

  315. <div class="ttc" id="astructParameterRanges_html_a63c40988463a8ace9d0e9e55a00f3c7b"><div class="ttname"><a href="structParameterRanges.html#a63c40988463a8ace9d0e9e55a00f3c7b">ParameterRanges::min</a></div><div class="ttdeci">float min</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:333</div></div>

  316. <div class="ttc" id="astructParameterRanges_html_aa0aba68115bcfff25c35b2da2f7aed4c"><div class="ttname"><a href="structParameterRanges.html#aa0aba68115bcfff25c35b2da2f7aed4c">ParameterRanges::def</a></div><div class="ttdeci">float def</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:328</div></div>

  317. <div class="ttc" id="astructParameter_html"><div class="ttname"><a href="structParameter.html">Parameter</a></div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:588</div></div>

  318. <div class="ttc" id="astructParameter_html_a2d0c81e4fb8fad18d920ef6ecd4a64db"><div class="ttname"><a href="structParameter.html#a2d0c81e4fb8fad18d920ef6ecd4a64db">Parameter::ranges</a></div><div class="ttdeci">ParameterRanges ranges</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:634</div></div>

  319. <div class="ttc" id="astructParameter_html_a397fb977f0c6cbec31df4f141ca3f5b3"><div class="ttname"><a href="structParameter.html#a397fb977f0c6cbec31df4f141ca3f5b3">Parameter::hints</a></div><div class="ttdeci">uint32_t hints</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:593</div></div>

  320. <div class="ttc" id="astructParameter_html_a3e546efd8dbd0d77351208b670719468"><div class="ttname"><a href="structParameter.html#a3e546efd8dbd0d77351208b670719468">Parameter::symbol</a></div><div class="ttdeci">String symbol</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:615</div></div>

  321. <div class="ttc" id="astructParameter_html_ae63c1fcfb20e320bada1f58c04ff18da"><div class="ttname"><a href="structParameter.html#ae63c1fcfb20e320bada1f58c04ff18da">Parameter::name</a></div><div class="ttdeci">String name</div><div class="ttdef"><b>Definition:</b> DistrhoDetails.hpp:600</div></div>

  322. </div><!-- fragment --><p>See the <a class="el" href="structParameter.html">Parameter</a> struct for more information about parameters.</p>

  323. <h1><a class="anchor" id="Programs"></a>

  324. Programs</h1>

  325. <p>Programs in DPF refer to plugin-side presets (usually called "factory presets").<br  />

  326. This is meant as an initial set of presets provided by plugin authors included in the actual plugin.</p>

  327. <p>To use programs you must first enable them by setting <a class="el" href="group__PluginMacros.html#gad95e24b17f196260cee15255fdb5b677">DISTRHO_PLUGIN_WANT_PROGRAMS</a> to 1 in your DistrhoPluginInfo.h file.<br  />

  328. When enabled you'll need to override 2 new function in your plugin code, <a class="el" href="classPlugin.html#a54d66af3111541b7c118f9749ef0231b">Plugin::initProgramName(uint32_t, String&amp;)</a> and <a class="el" href="classPlugin.html#a44eb1bfcc3a3e5949ad053fc9ce55ce8">Plugin::loadProgram(uint32_t)</a>.</p>

  329. <p>Here's an example of a plugin with a "default" program: </p><div class="fragment"><div class="line"><span class="keyword">class </span>PluginWithPresets : <span class="keyword">public</span> <a class="code" href="classPlugin.html">Plugin</a></div>

  330. <div class="line">{</div>

  331. <div class="line"><span class="keyword">public</span>:</div>

  332. <div class="line">   PluginWithPresets()</div>

  333. <div class="line">       : <a class="code" href="classPlugin.html">Plugin</a>(2, 1, 0), <span class="comment">// 2 parameters, 1 program and 0 states</span></div>

  334. <div class="line">         fGainL(1.0f),</div>

  335. <div class="line">         fGainR(1.0f),</div>

  336. <div class="line">   {</div>

  337. <div class="line">   }</div>

  338. <div class="line"> </div>

  339. <div class="line"><span class="keyword">protected</span>:</div>

  340. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  341. <div class="line"><span class="comment">   * Information */</span></div>

  342. <div class="line"> </div>

  343. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a00f7945c16149db6845fbcc2af729f4f">getLabel</a>()<span class="keyword"> const override</span></div>

  344. <div class="line"><span class="keyword">   </span>{</div>

  345. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;Prog&quot;</span>;</div>

  346. <div class="line">   }</div>

  347. <div class="line"> </div>

  348. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a955832840de786a7a22798f0ef451c5d">getMaker</a>()<span class="keyword"> const override</span></div>

  349. <div class="line"><span class="keyword">   </span>{</div>

  350. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;DPF&quot;</span>;</div>

  351. <div class="line">   }</div>

  352. <div class="line"> </div>

  353. <div class="line">   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classPlugin.html#a686a3c92a376a185d6fd97efd59125d1">getLicense</a>()<span class="keyword"> const override</span></div>

  354. <div class="line"><span class="keyword">   </span>{</div>

  355. <div class="line">       <span class="keywordflow">return</span> <span class="stringliteral">&quot;MIT&quot;</span>;</div>

  356. <div class="line">   }</div>

  357. <div class="line"> </div>

  358. <div class="line">   uint32_t <a class="code" href="classPlugin.html#abae540dd93caf4834270358a8aad334a">getVersion</a>()<span class="keyword"> const override</span></div>

  359. <div class="line"><span class="keyword">   </span>{</div>

  360. <div class="line">       <span class="keywordflow">return</span> <a class="code" href="group__MiscellaneousFunctions.html#ga95d67ff74d46b2c80f15c7790a523154">d_version</a>(1, 0, 0);</div>

  361. <div class="line">   }</div>

  362. <div class="line"> </div>

  363. <div class="line">   int64_t <a class="code" href="classPlugin.html#ad6ff8c80227d5ceebd40b96f3be29a66">getUniqueId</a>()<span class="keyword"> const override</span></div>

  364. <div class="line"><span class="keyword">   </span>{</div>

  365. <div class="line">       <span class="keywordflow">return</span> <a class="code" href="group__MiscellaneousFunctions.html#ga6827e90feb9bdcb6f76175a245fbf12c">d_cconst</a>(<span class="charliteral">&#39;P&#39;</span>, <span class="charliteral">&#39;r&#39;</span>, <span class="charliteral">&#39;o&#39;</span>, <span class="charliteral">&#39;g&#39;</span>);</div>

  366. <div class="line">   }</div>

  367. <div class="line"> </div>

  368. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  369. <div class="line"><span class="comment">   * Init */</span></div>

  370. <div class="line"><span class="comment"></span> </div>

  371. <div class="line"><span class="comment">  /**</span></div>

  372. <div class="line"><span class="comment">     Initialize a parameter.</span></div>

  373. <div class="line"><span class="comment">     This function will be called once, shortly after the plugin is created.</span></div>

  374. <div class="line"><span class="comment">   */</span></div>

  375. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#aacf87bd0037efeb3b60d204940f3f4a0">initParameter</a>(uint32_t index, <a class="code" href="structParameter.html">Parameter</a>&amp; parameter)<span class="keyword"> override</span></div>

  376. <div class="line"><span class="keyword">   </span>{</div>

  377. <div class="line">       parameter.<a class="code" href="structParameter.html#a397fb977f0c6cbec31df4f141ca3f5b3">hints</a>      = <a class="code" href="group__ParameterHints.html#gaf82d83a105dc418877ef91e84ac6efd3">kParameterIsAutomatable</a>;</div>

  378. <div class="line">       parameter.<a class="code" href="structParameter.html#a2d0c81e4fb8fad18d920ef6ecd4a64db">ranges</a>.<a class="code" href="structParameterRanges.html#a63c40988463a8ace9d0e9e55a00f3c7b">min</a> = 0.0f;</div>

  379. <div class="line">       parameter.<a class="code" href="structParameter.html#a2d0c81e4fb8fad18d920ef6ecd4a64db">ranges</a>.<a class="code" href="structParameterRanges.html#a175c78c905c598df929a4450e4d2a2a0">max</a> = 2.0f;</div>

  380. <div class="line">       parameter.<a class="code" href="structParameter.html#a2d0c81e4fb8fad18d920ef6ecd4a64db">ranges</a>.<a class="code" href="structParameterRanges.html#aa0aba68115bcfff25c35b2da2f7aed4c">def</a> = 1.0f;</div>

  381. <div class="line"> </div>

  382. <div class="line">       <span class="keywordflow">switch</span> (index)</div>

  383. <div class="line">       {</div>

  384. <div class="line">       <span class="keywordflow">case</span> 0:</div>

  385. <div class="line">           parameter.<a class="code" href="structParameter.html#ae63c1fcfb20e320bada1f58c04ff18da">name</a>   = <span class="stringliteral">&quot;Gain Right&quot;</span>;</div>

  386. <div class="line">           parameter.<a class="code" href="structParameter.html#a3e546efd8dbd0d77351208b670719468">symbol</a> = <span class="stringliteral">&quot;gainR&quot;</span>;</div>

  387. <div class="line">           <span class="keywordflow">break</span>;</div>

  388. <div class="line">       <span class="keywordflow">case</span> 1:</div>

  389. <div class="line">           parameter.<a class="code" href="structParameter.html#ae63c1fcfb20e320bada1f58c04ff18da">name</a>   = <span class="stringliteral">&quot;Gain Left&quot;</span>;</div>

  390. <div class="line">           parameter.<a class="code" href="structParameter.html#a3e546efd8dbd0d77351208b670719468">symbol</a> = <span class="stringliteral">&quot;gainL&quot;</span>;</div>

  391. <div class="line">           <span class="keywordflow">break</span>;</div>

  392. <div class="line">       }</div>

  393. <div class="line">   }</div>

  394. <div class="line"><span class="comment"></span> </div>

  395. <div class="line"><span class="comment">  /**</span></div>

  396. <div class="line"><span class="comment">     Set the name of the program @a index.</span></div>

  397. <div class="line"><span class="comment">     This function will be called once, shortly after the plugin is created.</span></div>

  398. <div class="line"><span class="comment">   */</span></div>

  399. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#a54d66af3111541b7c118f9749ef0231b">initProgramName</a>(uint32_t index, <a class="code" href="classString.html">String</a>&amp; programName)</div>

  400. <div class="line">   {</div>

  401. <div class="line">       <span class="comment">// we only have one program so we can skip checking the index</span></div>

  402. <div class="line"> </div>

  403. <div class="line">       programName = <span class="stringliteral">&quot;Default&quot;</span>;</div>

  404. <div class="line">   }</div>

  405. <div class="line"> </div>

  406. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  407. <div class="line"><span class="comment">   * Internal data */</span></div>

  408. <div class="line"><span class="comment"></span> </div>

  409. <div class="line"><span class="comment">  /**</span></div>

  410. <div class="line"><span class="comment">     Get the current value of a parameter.</span></div>

  411. <div class="line"><span class="comment">   */</span></div>

  412. <div class="line">   <span class="keywordtype">float</span> <a class="code" href="classPlugin.html#af9e9f5438e2e0c2352052eb5f95832aa">getParameterValue</a>(uint32_t index)<span class="keyword"> const override</span></div>

  413. <div class="line"><span class="keyword">   </span>{</div>

  414. <div class="line">       <span class="keywordflow">switch</span> (index)</div>

  415. <div class="line">       {</div>

  416. <div class="line">       <span class="keywordflow">case</span> 0:</div>

  417. <div class="line">           <span class="keywordflow">return</span> fGainL;</div>

  418. <div class="line">       <span class="keywordflow">case</span> 1:</div>

  419. <div class="line">           <span class="keywordflow">return</span> fGainR;</div>

  420. <div class="line">       <span class="keywordflow">default</span>:</div>

  421. <div class="line">           <span class="keywordflow">return</span> 0.f;</div>

  422. <div class="line">       }</div>

  423. <div class="line">   }</div>

  424. <div class="line"><span class="comment"></span> </div>

  425. <div class="line"><span class="comment">  /**</span></div>

  426. <div class="line"><span class="comment">     Change a parameter value.</span></div>

  427. <div class="line"><span class="comment">   */</span></div>

  428. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#a7e9e26ceafc7603ef6163483a9dc39be">setParameterValue</a>(uint32_t index, <span class="keywordtype">float</span> value)<span class="keyword"> override</span></div>

  429. <div class="line"><span class="keyword">   </span>{</div>

  430. <div class="line">       <span class="keywordflow">switch</span> (index)</div>

  431. <div class="line">       {</div>

  432. <div class="line">       <span class="keywordflow">case</span> 0:</div>

  433. <div class="line">           fGainL = value;</div>

  434. <div class="line">           <span class="keywordflow">break</span>;</div>

  435. <div class="line">       <span class="keywordflow">case</span> 1:</div>

  436. <div class="line">           fGainR = value;</div>

  437. <div class="line">           <span class="keywordflow">break</span>;</div>

  438. <div class="line">       }</div>

  439. <div class="line">   }</div>

  440. <div class="line"><span class="comment"></span> </div>

  441. <div class="line"><span class="comment">  /**</span></div>

  442. <div class="line"><span class="comment">     Load a program.</span></div>

  443. <div class="line"><span class="comment">   */</span></div>

  444. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#a44eb1bfcc3a3e5949ad053fc9ce55ce8">loadProgram</a>(uint32_t index)</div>

  445. <div class="line">   {</div>

  446. <div class="line">       <span class="comment">// same as before, ignore index check</span></div>

  447. <div class="line"> </div>

  448. <div class="line">       fGainL = 1.0f;</div>

  449. <div class="line">       fGainR = 1.0f;</div>

  450. <div class="line">   }</div>

  451. <div class="line"> </div>

  452. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------------------------</span></div>

  453. <div class="line"><span class="comment">   * Audio/MIDI Processing */</span></div>

  454. <div class="line"> </div>

  455. <div class="line">   <span class="keywordtype">void</span> <a class="code" href="classPlugin.html#a0a969c78f8455ac6ba65fa42e8c498f6">run</a>(<span class="keyword">const</span> <span class="keywordtype">float</span>**, <span class="keywordtype">float</span>** outputs, uint32_t frames)<span class="keyword"> override</span></div>

  456. <div class="line"><span class="keyword">   </span>{</div>

  457. <div class="line">       <span class="comment">// get the left and right audio buffers</span></div>

  458. <div class="line">       <span class="keyword">const</span> <span class="keywordtype">float</span>* <span class="keyword">const</span> inL  = inputs[0];</div>

  459. <div class="line">       <span class="keyword">const</span> <span class="keywordtype">float</span>* <span class="keyword">const</span> inR  = inputs[0];</div>

  460. <div class="line">       <span class="comment">/* */</span> <span class="keywordtype">float</span>* <span class="keyword">const</span> outL = outputs[0];</div>

  461. <div class="line">       <span class="comment">/* */</span> <span class="keywordtype">float</span>* <span class="keyword">const</span> outR = outputs[0];</div>

  462. <div class="line"> </div>

  463. <div class="line">       <span class="comment">// apply gain against all samples</span></div>

  464. <div class="line">       <span class="keywordflow">for</span> (uint32_t i=0; i &lt; frames; ++i)</div>

  465. <div class="line">       {</div>

  466. <div class="line">           outL[i] = inL[i] * fGainL;</div>

  467. <div class="line">           outR[i] = inR[i] * fGainR;</div>

  468. <div class="line">       }</div>

  469. <div class="line">   }</div>

  470. <div class="line"> </div>

  471. <div class="line"><span class="keyword">private</span>:</div>

  472. <div class="line">   <span class="keywordtype">float</span> fGainL, fGainR;</div>

  473. <div class="line">};</div>

  474. <div class="ttc" id="aclassPlugin_html_a44eb1bfcc3a3e5949ad053fc9ce55ce8"><div class="ttname"><a href="classPlugin.html#a44eb1bfcc3a3e5949ad053fc9ce55ce8">Plugin::loadProgram</a></div><div class="ttdeci">virtual void loadProgram(uint32_t index)</div></div>

  475. <div class="ttc" id="aclassPlugin_html_a54d66af3111541b7c118f9749ef0231b"><div class="ttname"><a href="classPlugin.html#a54d66af3111541b7c118f9749ef0231b">Plugin::initProgramName</a></div><div class="ttdeci">virtual void initProgramName(uint32_t index, String &amp;programName)=0</div></div>

  476. <div class="ttc" id="aclassString_html"><div class="ttname"><a href="classString.html">String</a></div><div class="ttdef"><b>Definition:</b> String.hpp:35</div></div>

  477. </div><!-- fragment --><p>This is a work-in-progress documentation page. States, MIDI, Latency, Time-Position and <a class="el" href="classUI.html">UI</a> are still TODO. </p>

  478. </div></div><!-- PageDoc -->

  479. </div><!-- contents -->

  480. <!-- start footer part -->

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  482. 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

  483. </small></address>

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