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<section id="preprocessor-options">
<h1>Preprocessor options<a class="headerlink" href="#preprocessor-options" title="Link to this heading"></a></h1>
<p id="preproc">Sound input is preprocessed by the Client Lib before the data is encoded
and sent to the TeamSpeak 3 server. The preprocessor is
responsible for noise suppression, automatic gain control (AGC) and voice
activity detection (VAD).</p>
<p>The preprocessor can be controlled by setting various preprocessor
flags. These flags are stored per server connection and can differ between
server connections.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Preprocessor flags are tied to a capture device, so changing the
values only makes sense after a device has been opened.</p>
</div>
<section id="available-config-values">
<h2>Available config values<a class="headerlink" href="#available-config-values" title="Link to this heading"></a></h2>
<p>The following configuration values are available for querying and setting:</p>
<ul>
<li><p>name</p>
<p>The type of the preprocessor in use. Currently always returns
“Speex preprocessor”</p>
</li>
<li><p>denoise</p>
<p>Boolean value. Whether or not noise suppression is enabled.
Enabled by default.</p>
</li>
<li><p>vad</p>
<p>Boolean value. Whether or not voice activity detection is enabled.
Enabled by default.</p>
</li>
<li><p>voiceactivation_level</p>
<p>Integer holding the decibel level above which voice activity detection
is sending voice data to the server.</p>
<p>A high voice activation level means you have to speak louder into the
microphone in order to start transmitting.</p>
<p>Reasonable values range from -50 to 50. Default is 0.</p>
</li>
<li><p>vad_extrabuffersize</p>
<p>Integer holding the buffer size for voice activity detection.</p>
<p>Valid values are 0 to 8. Defaults to 2. Lower value means faster
transmission, higher value means better VAD quality but higher latency.</p>
</li>
<li><p>agc</p>
<p>Boolean value. Whether or not automatic gain control is enabled.
Enabled by default.</p>
</li>
<li><p>agc_level</p>
<p>Integer. Automatic gain control level.
Defaults to 16000.</p>
</li>
<li><p>agc_main_gain</p>
<p>Integer holding the maximum gain for automatic gain control.
Defaults to 30.</p>
</li>
<li><p>echo_canceling</p>
<p>Boolean value. Whether echo cancelling feature is enabled.
Defaults to false.</p>
</li>
<li><p>decibel_last_period</p>
<p>Read only Float. Current input levels on the capture device.
Queried using <a class="reference internal" href="#c.ts3client_getPreProcessorInfoValueFloat" title="ts3client_getPreProcessorInfoValueFloat"><code class="xref c c-func docutils literal notranslate"><span class="pre">ts3client_getPreProcessorInfoValueFloat()</span></code></a></p>
</li>
</ul>
</section>
<section id="querying-values">
<h2>Querying values<a class="headerlink" href="#querying-values" title="Link to this heading"></a></h2>
<p>Preprocessor flags can be queried using:</p>
<dl class="c function">
<dt class="sig sig-object c">
<span class="kt"><span class="pre">unsigned</span></span><span class="w"> </span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ts3client_getPreProcessorConfigValue</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">uint64</span></span><span class="w"> </span><span class="n"><span class="pre">serverConnectionHandlerID</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">ident</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">result</span></span><span class="sig-paren">)</span><br /></dt>
<dd><p>Retrieve preprocessor configuration values. </p>
<p>Preprocessor settings are bound to a capture device. You must open a capture device on the specified connection handler before calling this function.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>serverConnectionHandlerID</strong> the connection handler for which to retrieve the configuration value </p></li>
<li><p><strong>ident</strong> the name of the preprocessor configuration to retrieve </p></li>
<li><p><strong>result</strong> address of a variable to receive a c string with the value of the specified preprocessor configuration. Memory is allocated by the client lib and must be freed by caller using <a class="reference internal" href="../client_api.html#clientlib_8h_1a783cbda7046acfc0173c669821702619"><span class="std std-ref">ts3client_freeMemory</span></a></p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>An Error code from the <a class="reference internal" href="../errors.html#public__errors_8h_1a0bcf1e0a5e32989890f6e85064327f7b"><span class="std std-ref">Ts3ErrorType</span></a> enum indicating either success or the failure reason </p>
</dd>
</dl>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c">
<span class="kt"><span class="pre">unsigned</span></span><span class="w"> </span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ts3client_getPreProcessorInfoValueFloat</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">uint64</span></span><span class="w"> </span><span class="n"><span class="pre">serverConnectionHandlerID</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">ident</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">result</span></span><span class="sig-paren">)</span><br /></dt>
<dd><p>Retrieve floating point preprocessor configuration values. </p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>serverConnectionHandlerID</strong> the connection handler for which to retrieve the value </p></li>
<li><p><strong>ident</strong> the name of the preprocessor value to retrieve </p></li>
<li><p><strong>result</strong> address of a variable to receive the specified configuration value </p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>An Error code from the <a class="reference internal" href="../errors.html#public__errors_8h_1a0bcf1e0a5e32989890f6e85064327f7b"><span class="std std-ref">Ts3ErrorType</span></a> enum indicating either success or the failure reason </p>
</dd>
</dl>
</dd></dl>
</section>
<section id="setting-values">
<h2>Setting values<a class="headerlink" href="#setting-values" title="Link to this heading"></a></h2>
<p>To configure the proprocessor use</p>
<dl class="c function">
<dt class="sig sig-object c">
<span class="kt"><span class="pre">unsigned</span></span><span class="w"> </span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">ts3client_setPreProcessorConfigValue</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">uint64</span></span><span class="w"> </span><span class="n"><span class="pre">serverConnectionHandlerID</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">ident</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">value</span></span><span class="sig-paren">)</span><br /></dt>
<dd><p>Set preprocessor configuration values. </p>
<p>Preprocessor settings are bound to a capture device. You must open a capture device on the specified connection handler before calling this function.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>serverConnectionHandlerID</strong> the connection handler for which to retrieve the configuration value </p></li>
<li><p><strong>ident</strong> the name of the preprocessor configuration to retrieve </p></li>
<li><p><strong>value</strong> the new value to set </p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>An Error code from the <a class="reference internal" href="../errors.html#public__errors_8h_1a0bcf1e0a5e32989890f6e85064327f7b"><span class="std std-ref">Ts3ErrorType</span></a> enum indicating either success or the failure reason </p>
</dd>
</dl>
</dd></dl>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>For boolean values use their string representation “true” or “false”</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>It is not necessary to change all those values. The default values
are reasonable. “voiceactivation_level” is often the only value that
needs to be adjusted.</p>
</div>
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