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<h2><span class="refentrytitle"><a name="GstBtTempo.top_of_page"></a>GstBtTempo</span></h2>
<p>GstBtTempo — helper interface for tempo synced gstreamer elements</p>
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<div class="refsect1">
<a name="GstBtTempo.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
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<td class="function_type">
<span class="returnvalue">void</span>
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<td class="function_name">
<a class="link" href="GstBtTempo.html#gstbt-tempo-change-tempo" title="gstbt_tempo_change_tempo ()">gstbt_tempo_change_tempo</a> <span class="c_punctuation">()</span>
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<a name="GstBtTempo.properties"></a><h2>Properties</h2>
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<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
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<td class="property_type"><span class="type">gulong</span></td>
<td class="property_name"><a class="link" href="GstBtTempo.html#GstBtTempo--beats-per-minute" title="The “beats-per-minute” property">beats-per-minute</a></td>
<td class="property_flags">Read / Write</td>
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<td class="property_type"><span class="type">gulong</span></td>
<td class="property_name"><a class="link" href="GstBtTempo.html#GstBtTempo--subticks-per-tick" title="The “subticks-per-tick” property">subticks-per-tick</a></td>
<td class="property_flags">Read / Write</td>
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<td class="property_type"><span class="type">gulong</span></td>
<td class="property_name"><a class="link" href="GstBtTempo.html#GstBtTempo--ticks-per-beat" title="The “ticks-per-beat” property">ticks-per-beat</a></td>
<td class="property_flags">Read / Write</td>
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<div class="refsect1">
<a name="GstBtTempo.other"></a><h2>Types and Values</h2>
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<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
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<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GstBtTempo.html#GstBtTempo-struct" title="GstBtTempo">GstBtTempo</a></td>
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<div class="refsect1">
<a name="GstBtTempo.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> GInterface
<span class="lineart">╰──</span> GstBtTempo
</pre>
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<div class="refsect1">
<a name="GstBtTempo.implementations"></a><h2>Known Implementations</h2>
<p>
GstBtTempo is implemented by
<a class="link" href="GstBtAudioDelay.html" title="GstBtAudioDelay">GstBtAudioDelay</a>, <a class="link" href="gst-buzztard-GstFluidSynth.html#GstBtFluidsynth">GstBtFluidsynth</a> and <a class="link" href="GstBtSimSyn.html" title="GstBtSimSyn">GstBtSimSyn</a>.</p>
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<div class="refsect1">
<a name="GstBtTempo.description"></a><h2>Description</h2>
<p>This interface offers three <span class="type">GObject</span> properties to specify a rythmic tempo of
the GStreamer pipeline. The tempo can be changed from the application side by
calling <a class="link" href="GstBtTempo.html#gstbt-tempo-change-tempo" title="gstbt_tempo_change_tempo ()"><code class="function">gstbt_tempo_change_tempo()</code></a>.</p>
<p><span class="type">GstElements</span> that implement this interface should use the given tempo, to
adjust their <code class="function">gst_object_sync_values()</code> cycle.</p>
<p>The difference between the tempo iface and the tempo-tag metadata is that the
metadata describes the overall tempo, but the iface allows to change the
tempo during playback.</p>
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<div class="refsect1">
<a name="GstBtTempo.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gstbt-tempo-change-tempo"></a><h3>gstbt_tempo_change_tempo ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gstbt_tempo_change_tempo (<em class="parameter"><code><a class="link" href="GstBtTempo.html" title="GstBtTempo"><span class="type">GstBtTempo</span></a> *self</code></em>,
<em class="parameter"><code><span class="type">glong</span> beats_per_minute</code></em>,
<em class="parameter"><code><span class="type">glong</span> ticks_per_beat</code></em>,
<em class="parameter"><code><span class="type">glong</span> subticks_per_tick</code></em>);</pre>
<p>Set all tempo properties at once. Pass -1 to leave a value unchanged.</p>
<div class="refsect3">
<a name="id-1.4.5.9.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
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<col class="parameters_description">
<col width="200px" class="parameters_annotations">
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<td class="parameter_name"><p>self</p></td>
<td class="parameter_description"><p>a <span class="type">GObject</span> that implements <a class="link" href="GstBtTempo.html" title="GstBtTempo"><span class="type">GstBtTempo</span></a></p></td>
<td class="parameter_annotations"> </td>
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<td class="parameter_name"><p>beats_per_minute</p></td>
<td class="parameter_description"><p>the number of beats in a minute</p></td>
<td class="parameter_annotations"> </td>
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<tr>
<td class="parameter_name"><p>ticks_per_beat</p></td>
<td class="parameter_description"><p>the number of ticks of one beat (measure)</p></td>
<td class="parameter_annotations"> </td>
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<td class="parameter_name"><p>subticks_per_tick</p></td>
<td class="parameter_description"><p>the number of subticks within one tick</p></td>
<td class="parameter_annotations"> </td>
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</tbody>
</table></div>
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<div class="refsect1">
<a name="GstBtTempo.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstBtTempo-struct"></a><h3>GstBtTempo</h3>
<pre class="programlisting">typedef struct _GstBtTempo GstBtTempo;</pre>
<p>Opaque interface structure.</p>
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</div>
<div class="refsect1">
<a name="GstBtTempo.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstBtTempo--beats-per-minute"></a><h3>The <code class="literal">“beats-per-minute”</code> property</h3>
<pre class="programlisting"> “beats-per-minute” <span class="type">gulong</span></pre>
<p>the number of beats per minute the top level pipeline uses.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 1</p>
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<hr>
<div class="refsect2">
<a name="GstBtTempo--subticks-per-tick"></a><h3>The <code class="literal">“subticks-per-tick”</code> property</h3>
<pre class="programlisting"> “subticks-per-tick” <span class="type">gulong</span></pre>
<p>the number of subticks (for smoothing) per tick the top level pipeline uses.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 1</p>
</div>
<hr>
<div class="refsect2">
<a name="GstBtTempo--ticks-per-beat"></a><h3>The <code class="literal">“ticks-per-beat”</code> property</h3>
<pre class="programlisting"> “ticks-per-beat” <span class="type">gulong</span></pre>
<p>the number of ticks (events) per beat the top level pipeline uses.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 1</p>
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