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<li class="navelem"><a class="el" href="index.html">Index, Preamble and License</a></li> </ul>
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<div class="title">Primitive control plugins </div> </div>
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<div class="contents">
<div class="textblock"><p>Control plugins extends functionality and features of control devices. The plugins take care about various control mapping or so.</p>
<p>The child configuration (in one compound):</p>
<div class="fragment"><div class="line">ctl.test {</div>
<div class="line"> <a class="code" href="ump__msg_8h.html#ad44b615021ed3ccb734fcaf583ef4a03">type</a> remap</div>
<div class="line"> child <span class="stringliteral">"hw:0"</span></div>
<div class="line"> ... map/remap configuration ...</div>
<div class="line">}</div>
<div class="ttc" id="aump__msg_8h_html_ad44b615021ed3ccb734fcaf583ef4a03"><div class="ttname"><a href="ump__msg_8h.html#ad44b615021ed3ccb734fcaf583ef4a03">type</a></div><div class="ttdeci">uint8_t type</div><div class="ttdef"><b>Definition:</b> ump_msg.h:13</div></div>
</div><!-- fragment --><p>The child may be defined as compound containing the full specification:</p>
<div class="fragment"><div class="line">ctl.test {</div>
<div class="line"> <a class="code" href="ump__msg_8h.html#ad44b615021ed3ccb734fcaf583ef4a03">type</a> remap</div>
<div class="line"> child {</div>
<div class="line"> <a class="code" href="ump__msg_8h.html#ad44b615021ed3ccb734fcaf583ef4a03">type</a> hw</div>
<div class="line"> card 0</div>
<div class="line"> }</div>
<div class="line"> ... map/remap configuration ...</div>
<div class="line">}</div>
</div><!-- fragment --><h1><a class="anchor" id="control_plugins_hw"></a>
Plugin: hw</h1>
<p>This plugin communicates directly with the ALSA kernel driver. It is a raw communication without any conversions.</p>
<div class="fragment"><div class="line">control.name {</div>
<div class="line"> <a class="code" href="ump__msg_8h.html#ad44b615021ed3ccb734fcaf583ef4a03">type</a> hw # Kernel PCM</div>
<div class="line"> card INT/STR # Card name (<span class="keywordtype">string</span>) or number (integer)</div>
<div class="line">}</div>
</div><!-- fragment --><h2><a class="anchor" id="control_plugins_hw_funcref"></a>
Function reference</h2>
<ul>
<li>
<a class="el" href="control__hw_8c.html#a3f4ae02866f22f00b1293a1d220aaf71" title="Creates a new hw control.">snd_ctl_hw_open()</a> </li>
<li>
<a class="el" href="control__hw_8c.html#a29d03fdf50ba279345fada433951bd46" title="Creates a new hw control handle.">_snd_ctl_hw_open()</a> </li>
</ul>
<h1><a class="anchor" id="control_plugins_remap"></a>
Plugin: Remap & map</h1>
<p>This plugin can remap (rename) identifiers (except the numid part) for a child control to another. The plugin can also merge the multiple child controls to one or split one control to more.</p>
<div class="fragment"><div class="line">ctl.name {</div>
<div class="line"> <a class="code" href="ump__msg_8h.html#ad44b615021ed3ccb734fcaf583ef4a03">type</a> remap # Remap controls</div>
<div class="line"> child STR # Child name</div>
<div class="line"><span class="preprocessor"> # or</span></div>
<div class="line"> child { # Child definition</div>
<div class="line"> <a class="code" href="ump__msg_8h.html#ad44b615021ed3ccb734fcaf583ef4a03">type</a> STR</div>
<div class="line"> ...</div>
<div class="line"> }</div>
<div class="line"> remap {</div>
<div class="line"><span class="preprocessor"> # the ID strings are parsed in the amixer style like 'name="Headphone Playback Switch"</span>,index=2'</div>
<div class="line"> SRC_ID1_STR DST_ID1_STR</div>
<div class="line"> SRC_ID2_STR DST_ID2_STR</div>
<div class="line"> ...</div>
<div class="line"> }</div>
<div class="line"> map {</div>
<div class="line"><span class="preprocessor"> # join two stereo controls to one</span></div>
<div class="line"> CREATE_ID1_STR {</div>
<div class="line"> SRC_ID1_STR {</div>
<div class="line"> vindex.0 0 # source <a class="code" href="ump__msg_8h.html#a715f5cb061d11eb75981741eda4dafcd">channel</a> 0 to merged <a class="code" href="ump__msg_8h.html#a715f5cb061d11eb75981741eda4dafcd">channel</a> 0</div>
<div class="line"> vindex.1 1</div>
<div class="line"> }</div>
<div class="line"> SRC_ID2_STR {</div>
<div class="line"> vindex.2 0</div>
<div class="line"> vindex.3 1 # source <a class="code" href="ump__msg_8h.html#a715f5cb061d11eb75981741eda4dafcd">channel</a> 1 to merged <a class="code" href="ump__msg_8h.html#a715f5cb061d11eb75981741eda4dafcd">channel</a> 3</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"><span class="preprocessor"> # split stereo to mono</span></div>
<div class="line"> CREATE_ID2_STR {</div>
<div class="line"> SRC_ID3_STR {</div>
<div class="line"> vindex.0 0 # stereo to mono (first <a class="code" href="ump__msg_8h.html#a715f5cb061d11eb75981741eda4dafcd">channel</a>)</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> CREATE_ID3_STR {</div>
<div class="line"> SRC_ID4_STR {</div>
<div class="line"> vindex.0 1 # stereo to mono (second <a class="code" href="ump__msg_8h.html#a715f5cb061d11eb75981741eda4dafcd">channel</a>)</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="ttc" id="aump__msg_8h_html_a715f5cb061d11eb75981741eda4dafcd"><div class="ttname"><a href="ump__msg_8h.html#a715f5cb061d11eb75981741eda4dafcd">channel</a></div><div class="ttdeci">uint8_t channel</div><div class="ttdef"><b>Definition:</b> ump_msg.h:10</div></div>
</div><!-- fragment --><h2><a class="anchor" id="control_plugins_route_funcref"></a>
Function reference</h2>
<ul>
<li>
<a class="el" href="control__remap_8c.html#a14d6e496a606bc529b1df823bb79444d" title="Creates a new remap & map control handle.">snd_ctl_remap_open()</a> </li>
<li>
<a class="el" href="control__remap_8c.html#a966d901e9146469d7325abf3282db206" title="Creates a new remap & map control plugin.">_snd_ctl_remap_open()</a> </li>
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