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<a href="#gst-plugins-base-plugins-audiotestsrc.description" class="shortcut">Description</a>
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<a href="#gst-plugins-base-plugins-audiotestsrc.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#gst-plugins-base-plugins-audiotestsrc.properties" class="shortcut">Properties</a>
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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 valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-plugins-audiotestsrc.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioTestSrc"></a><pre class="synopsis">struct <a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc-struct" title="struct GstAudioTestSrc">GstAudioTestSrc</a>;
enum <a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave">GstAudioTestSrcWave</a>;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html">GstObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html">GstElement</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSrc.html">GstBaseSrc</a>
+----GstAudioTestSrc
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-audiotestsrc.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--freq" title='The "freq" property'>freq</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--is-live" title='The "is-live" property'>is-live</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--samplesperbuffer" title='The "samplesperbuffer" property'>samplesperbuffer</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--timestamp-offset" title='The "timestamp-offset" property'>timestamp-offset</a>" <span class="type">gint64</span> : Read / Write
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--volume" title='The "volume" property'>volume</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--wave" title='The "wave" property'>wave</a>" <a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave"><span class="type">GstAudioTestSrcWave</span></a> : Read / Write
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--can-activate-pull" title='The "can-activate-pull" property'>can-activate-pull</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write
"<a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--can-activate-push" title='The "can-activate-push" property'>can-activate-push</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write
</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>
<p>
</p>
<div class="refsect2">
<a name="id-1.2.10.6.3.1"></a><h3>Example launch line</h3>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch audiotestsrc <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> alsasink</pre></td>
</tr>
</tbody>
</table>
</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">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch audiotestsrc wave<span class="gtkdoc opt">=</span><span class="number">2</span> freq<span class="gtkdoc opt">=</span><span class="number">200</span> <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> tee name<span class="gtkdoc opt">=</span>t <span class="gtkdoc opt">!</span> queue <span class="gtkdoc opt">!</span> alsasink t<span class="gtkdoc opt">. !</span> queue <span class="gtkdoc opt">!</span> libvisual_lv_scope <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> xvimagesink</pre></td>
</tr>
</tbody>
</table>
</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>
<p>
</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.10.6.4.1"></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 <ensonic@users.sf.net></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-1.2.10.6.4.2"></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.details"></a><h2>Details</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>
<pre class="programlisting">typedef enum {
GST_AUDIO_TEST_SRC_WAVE_SINE,
GST_AUDIO_TEST_SRC_WAVE_SQUARE,
GST_AUDIO_TEST_SRC_WAVE_SAW,
GST_AUDIO_TEST_SRC_WAVE_TRIANGLE,
GST_AUDIO_TEST_SRC_WAVE_SILENCE,
GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE,
GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE,
GST_AUDIO_TEST_SRC_WAVE_SINE_TAB,
GST_AUDIO_TEST_SRC_WAVE_TICKS,
GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE,
GST_AUDIO_TEST_SRC_WAVE_RED_NOISE,
GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE,
GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE
} GstAudioTestSrcWave;
</pre>
<p>
Different types of supported sound waves.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-SINE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_SINE</code></span></p></td>
<td>a sine wave
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-SQUARE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_SQUARE</code></span></p></td>
<td>a square wave
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-SAW:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_SAW</code></span></p></td>
<td>a saw wave
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-TRIANGLE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_TRIANGLE</code></span></p></td>
<td>a tringle wave
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-SILENCE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_SILENCE</code></span></p></td>
<td>silence
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-WHITE-NOISE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE</code></span></p></td>
<td>white uniform noise
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-PINK-NOISE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE</code></span></p></td>
<td>pink noise
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-SINE-TAB:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_SINE_TAB</code></span></p></td>
<td>sine wave using a table
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-TICKS:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_TICKS</code></span></p></td>
<td>periodic ticks
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-GAUSSIAN-WHITE-NOISE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE</code></span></p></td>
<td>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.
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-RED-NOISE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_RED_NOISE</code></span></p></td>
<td>red (brownian) noise
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-BLUE-NOISE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE</code></span></p></td>
<td>spectraly inverted pink noise
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-TEST-SRC-WAVE-VIOLET-NOISE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE</code></span></p></td>
<td>spectraly inverted red (brownian) noise
</td>
</tr>
</tbody>
</table></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> : Read / Write</pre>
<p>Frequency of test signal.</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> : Read / Write</pre>
<p>Whether to act as a live source.</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> : Read / Write</pre>
<p>Number of samples in each outgoing buffer.</p>
<p>Allowed values: >= 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> : Read / Write</pre>
<p>An offset added to timestamps set on buffers (in ns).</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> : Read / Write</pre>
<p>Volume of test signal.</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> : Read / Write</pre>
<p>Oscillator waveform.</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> : Read / Write</pre>
<p>Can activate in pull mode.</p>
<p>Default value: FALSE</p>
</div>
<hr>
<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> : Read / Write</pre>
<p>Can activate in push mode.</p>
<p>Default value: TRUE</p>
</div>
</div>
</div>
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