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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
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<title>GStreamer Base Plugins 1.0 Plugins Reference Manual: audiotestsrc</title>
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<div class="refentry">
<a name="gst-plugins-base-plugins-audiotestsrc"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-audiotestsrc.top_of_page"></a>audiotestsrc</span></h2>
<p>audiotestsrc — Creates audio test signals of given frequency and volume</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--freq" title="The “freq” property">freq</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--is-live" title="The “is-live” property">is-live</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--samplesperbuffer" title="The “samplesperbuffer” property">samplesperbuffer</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">gint64</span></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--timestamp-offset" title="The “timestamp-offset” property">timestamp-offset</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--volume" title="The “volume” property">volume</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave"><span class="type">GstAudioTestSrcWave</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--wave" title="The “wave” property">wave</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--can-activate-pull" title="The “can-activate-pull” property">can-activate-pull</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--can-activate-push" title="The “can-activate-push” property">can-activate-push</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstAudioTestSrc"></a><div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc-struct" title="struct GstAudioTestSrc">GstAudioTestSrc</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave">GstAudioTestSrcWave</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html">GstElement</a>
                <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSrc.html">GstBaseSrc</a>
                    <span class="lineart">╰──</span> GstAudioTestSrc
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.description"></a><h2>Description</h2>
<p>AudioTestSrc can be used to generate basic audio signals. It support several
different waveforms and allows to set the base frequency and volume.</p>
<div class="refsect2">
<a name="id-1.2.10.7.3"></a><h3>Example launch line</h3>
<div class="informalexample"><pre class="programlisting">
gst-launch audiotestsrc ! audioconvert ! alsasink
</pre></div> This pipeline produces a sine with default frequency, 440 Hz, and the
default volume, 0.8 (relative to a maximum 1.0).
<div class="informalexample"><pre class="programlisting">
gst-launch audiotestsrc wave=2 freq=200 ! audioconvert ! tee name=t ! queue ! alsasink t. ! queue ! libvisual_lv_scope ! videoconvert ! xvimagesink
</pre></div> In this example a saw wave is generated. The wave is shown using a
scope visualizer from libvisual, allowing you to visually verify that
the saw wave is correct.
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.10.7.4.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
            <a class="link" href="gst-plugins-base-plugins-plugin-audiotestsrc.html#plugin-audiotestsrc">audiotestsrc</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Stefan Kost &lt;ensonic@users.sf.net&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Source/Audio</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.10.7.4.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/x-raw, format=(string){ S16LE, S32LE, F32LE, F64LE }, layout=(string)interleaved, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.functions_details"></a><h2>Functions</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAudioTestSrc-struct"></a><h3>struct GstAudioTestSrc</h3>
<pre class="programlisting">struct GstAudioTestSrc;</pre>
<p>audiotestsrc object structure.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioTestSrcWave"></a><h3>enum GstAudioTestSrcWave</h3>
<p>Different types of supported sound waves.</p>
<div class="refsect3">
<a name="id-1.2.10.9.3.4"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SINE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SINE</p></td>
<td class="enum_member_description">
<p>a sine wave</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SQUARE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SQUARE</p></td>
<td class="enum_member_description">
<p>a square wave</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SAW:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SAW</p></td>
<td class="enum_member_description">
<p>a saw wave</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-TRIANGLE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_TRIANGLE</p></td>
<td class="enum_member_description">
<p>a tringle wave</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SILENCE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SILENCE</p></td>
<td class="enum_member_description">
<p>silence</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-WHITE-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE</p></td>
<td class="enum_member_description">
<p>white uniform noise</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-PINK-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE</p></td>
<td class="enum_member_description">
<p>pink noise</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SINE-TAB:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SINE_TAB</p></td>
<td class="enum_member_description">
<p>sine wave using a table</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-TICKS:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_TICKS</p></td>
<td class="enum_member_description">
<p>periodic ticks</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-GAUSSIAN-WHITE-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE</p></td>
<td class="enum_member_description">
<p>white (zero mean) Gaussian noise;  volume sets the standard deviation of the noise in units of the range of values of the sample type, e.g. volume=0.1 produces noise with a standard deviation of 0.1*32767=3277 with 16-bit integer samples, or 0.1*1.0=0.1 with floating-point samples.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-RED-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_RED_NOISE</p></td>
<td class="enum_member_description">
<p>red (brownian) noise</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-BLUE-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE</p></td>
<td class="enum_member_description">
<p>spectraly inverted pink noise</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-VIOLET-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE</p></td>
<td class="enum_member_description">
<p>spectraly inverted red (brownian) noise</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioTestSrc--freq"></a><h3>The <code class="literal">“freq”</code> property</h3>
<pre class="programlisting">  “freq”                     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></pre>
<p>Frequency of test signal.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,20000]</p>
<p>Default value: 440</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioTestSrc--is-live"></a><h3>The <code class="literal">“is-live”</code> property</h3>
<pre class="programlisting">  “is-live”                  <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether to act as a live source.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioTestSrc--samplesperbuffer"></a><h3>The <code class="literal">“samplesperbuffer”</code> property</h3>
<pre class="programlisting">  “samplesperbuffer”         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Number of samples in each outgoing buffer.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &gt;= 1</p>
<p>Default value: 1024</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioTestSrc--timestamp-offset"></a><h3>The <code class="literal">“timestamp-offset”</code> property</h3>
<pre class="programlisting">  “timestamp-offset”         <span class="type">gint64</span></pre>
<p>An offset added to timestamps set on buffers (in ns).</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioTestSrc--volume"></a><h3>The <code class="literal">“volume”</code> property</h3>
<pre class="programlisting">  “volume”                   <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></pre>
<p>Volume of test signal.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,1]</p>
<p>Default value: 0.8</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioTestSrc--wave"></a><h3>The <code class="literal">“wave”</code> property</h3>
<pre class="programlisting">  “wave”                     <a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave"><span class="type">GstAudioTestSrcWave</span></a></pre>
<p>Oscillator waveform.</p>
<p>Flags: Read / Write</p>
<p>Default value: Sine</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioTestSrc--can-activate-pull"></a><h3>The <code class="literal">“can-activate-pull”</code> property</h3>
<pre class="programlisting">  “can-activate-pull”        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Can activate in pull mode.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
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<div class="refsect2">
<a name="GstAudioTestSrc--can-activate-push"></a><h3>The <code class="literal">“can-activate-push”</code> property</h3>
<pre class="programlisting">  “can-activate-push”        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Can activate in push mode.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
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