<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>audiotestsrc</title> <meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> <link rel="home" href="index.html" title="GStreamer Base Plugins 0.10 Plugins Reference Manual"> <link rel="up" href="ch01.html" title="gst-plugins-base Elements"> <link rel="prev" href="gst-plugins-base-plugins-audioresample.html" title="audioresample"> <link rel="next" href="gst-plugins-base-plugins-cdparanoiasrc.html" title="cdparanoiasrc"> <meta name="generator" content="GTK-Doc V1.18 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"> <tr valign="middle"> <td><a accesskey="p" href="gst-plugins-base-plugins-audioresample.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td> <td><a accesskey="u" href="ch01.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td> <th width="100%" align="center">GStreamer Base Plugins 0.10 Plugins Reference Manual</th> <td><a accesskey="n" href="gst-plugins-base-plugins-cdparanoiasrc.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td> </tr> <tr><td colspan="5" class="shortcuts"> <a href="#gst-plugins-base-plugins-audiotestsrc.synopsis" class="shortcut">Top</a> | <a href="#gst-plugins-base-plugins-audiotestsrc.description" class="shortcut">Description</a> | <a href="#gst-plugins-base-plugins-audiotestsrc.object-hierarchy" class="shortcut">Object Hierarchy</a> | <a href="#gst-plugins-base-plugins-audiotestsrc.properties" class="shortcut">Properties</a> </td></tr> </table> <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="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a> +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a> +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a> +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="idp10528400"></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> ffmpegcolorspace <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="idp10222736"></a><h3>Element Information</h3> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <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="idp10230192"></a><h3>Element Pads</h3> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <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-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ]</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ]</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-float, endianness=(int)1234, width=(int){ 32, 64 }, 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"> <col align="left" valign="top"> <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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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="http://library.gnome.org/devel/glib/unstable/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> <div class="footer"> <hr> Generated by GTK-Doc V1.18</div> </body> </html>