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<a name="gst-plugins-good-plugins-spectrum"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-spectrum.top_of_page"></a>spectrum</span></h2>
<p>spectrum — Run an FFT on the audio signal, output spectrum data</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.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#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--bands" title="The “bands” property">bands</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">guint64</span></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--interval" title="The “interval” property">interval</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-good-plugins-spectrum.html#GstSpectrum--message" title="The “message” property">message</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-good-plugins-spectrum.html#GstSpectrum--threshold" title="The “threshold” property">threshold</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-good-plugins-spectrum.html#GstSpectrum--message-magnitude" title="The “message-magnitude” property">message-magnitude</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-good-plugins-spectrum.html#GstSpectrum--message-phase" title="The “message-phase” property">message-phase</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-good-plugins-spectrum.html#GstSpectrum--post-messages" title="The “post-messages” property">post-messages</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-good-plugins-spectrum.html#GstSpectrum--multi-channel" title="The “multi-channel” property">multi-channel</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstSpectrum"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.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-good-plugins-spectrum.html#GstSpectrum-struct" title="struct GstSpectrum">GstSpectrum</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.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/GstBaseTransform.html">GstBaseTransform</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gst-plugins-base-libs-1.0/gst-plugins-base-libs-gstaudiofilter.html#GstAudioFilter">GstAudioFilter</a>
<span class="lineart">╰──</span> GstSpectrum
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.description"></a><h2>Description</h2>
<p>The Spectrum element analyzes the frequency spectrum of an audio signal.
If the <a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--post-messages" title="The “post-messages” property"><span class="type">“post-messages”</span></a> property is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a>, it sends analysis results
as element messages named</p>
<code class="classname">"spectrum"</code> after each interval of time given
<p>by the <a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--interval" title="The “interval” property"><span class="type">“interval”</span></a> property.</p>
<p>The message's structure contains some combination of these fields:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>
<code class="classname">"timestamp"</code>:
the timestamp of the buffer that triggered the message.
</p></li>
<li class="listitem"><p>
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>
<code class="classname">"stream-time"</code>:
the stream time of the buffer.
</p></li>
<li class="listitem"><p>
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>
<code class="classname">"running-time"</code>:
the running_time of the buffer.
</p></li>
<li class="listitem"><p>
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>
<code class="classname">"duration"</code>:
the duration of the buffer.
</p></li>
<li class="listitem"><p>
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>
<code class="classname">"endtime"</code>:
the end time of the buffer that triggered the message as stream time (this
is deprecated, as it can be calculated from stream-time + duration)
</p></li>
<li class="listitem"><p>
<span class="type">GstValueList</span> of <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>
<code class="classname">"magnitude"</code>:
the level for each frequency band in dB. All values below the value of the
<a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--threshold" title="The “threshold” property"><span class="type">“threshold”</span></a> property will be set to the threshold. Only present
if the <a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--message-magnitude" title="The “message-magnitude” property"><span class="type">“message-magnitude”</span></a> property is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>.
</p></li>
<li class="listitem"><p>
<span class="type">GstValueList</span> of <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a>
<code class="classname">"phase"</code>:
The phase for each frequency band. The value is between -pi and pi. Only
present if the <a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--message-phase" title="The “message-phase” property"><span class="type">“message-phase”</span></a> property is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>.
</p></li>
</ul></div>
<p>If <a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--multi-channel" title="The “multi-channel” property"><span class="type">“multi-channel”</span></a> property is set to true. magnitude and phase
fields will be each a nested <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstControlSource.html#GstValueArray"><span class="type">GstValueArray</span></a>. The first dimension are the
channels and the second dimension are the values.</p>
<div class="refsect2">
<a name="id-1.2.139.7.8"></a><h3>Example application</h3>
<div class="informalexample"><pre class="programlisting">
/* GStreamer
* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
* Copyright (C) 2008 Jan Schmidt <jan.schmidt@sun.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <gst/gst.h>
static guint spect_bands = 20;
#define AUDIOFREQ 32000
/* receive spectral data from element message */
static gboolean
message_handler (GstBus * bus, GstMessage * message, gpointer data)
{
if (message->type == GST_MESSAGE_ELEMENT) {
const GstStructure *s = gst_message_get_structure (message);
const gchar *name = gst_structure_get_name (s);
GstClockTime endtime;
if (strcmp (name, "spectrum") == 0) {
const GValue *magnitudes;
const GValue *phases;
const GValue *mag, *phase;
gdouble freq;
guint i;
if (!gst_structure_get_clock_time (s, "endtime", &endtime))
endtime = GST_CLOCK_TIME_NONE;
g_print ("New spectrum message, endtime %" GST_TIME_FORMAT "\n",
GST_TIME_ARGS (endtime));
magnitudes = gst_structure_get_value (s, "magnitude");
phases = gst_structure_get_value (s, "phase");
for (i = 0; i < spect_bands; ++i) {
freq = (gdouble) ((AUDIOFREQ / 2) * i + AUDIOFREQ / 4) / spect_bands;
mag = gst_value_list_get_value (magnitudes, i);
phase = gst_value_list_get_value (phases, i);
if (mag != NULL && phase != NULL) {
g_print ("band %d (freq %g): magnitude %f dB phase %f\n", i, freq,
g_value_get_float (mag), g_value_get_float (phase));
}
}
g_print ("\n");
}
}
return TRUE;
}
int
main (int argc, char *argv[])
{
GstElement *bin;
GstElement *src, *audioconvert, *spectrum, *sink;
GstBus *bus;
GstCaps *caps;
GMainLoop *loop;
gst_init (&argc, &argv);
bin = gst_pipeline_new ("bin");
src = gst_element_factory_make ("audiotestsrc", "src");
g_object_set (G_OBJECT (src), "wave", 0, "freq", 6000.0, NULL);
audioconvert = gst_element_factory_make ("audioconvert", NULL);
g_assert (audioconvert);
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
"post-messages", TRUE, "message-phase", TRUE, NULL);
sink = gst_element_factory_make ("fakesink", "sink");
g_object_set (G_OBJECT (sink), "sync", TRUE, NULL);
gst_bin_add_many (GST_BIN (bin), src, audioconvert, spectrum, sink, NULL);
caps = gst_caps_new_simple ("audio/x-raw",
"rate", G_TYPE_INT, AUDIOFREQ, NULL);
if (!gst_element_link (src, audioconvert) ||
!gst_element_link_filtered (audioconvert, spectrum, caps) ||
!gst_element_link (spectrum, sink)) {
fprintf (stderr, "can't link elements\n");
exit (1);
}
gst_caps_unref (caps);
bus = gst_element_get_bus (bin);
gst_bus_add_watch (bus, message_handler, NULL);
gst_object_unref (bus);
gst_element_set_state (bin, GST_STATE_PLAYING);
/* we need to run a GLib main loop to get the messages */
loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (loop);
gst_element_set_state (bin, GST_STATE_NULL);
gst_object_unref (bin);
return 0;
}
</pre></div>
</div>
<p>Last reviewed on 2011-03-10 (0.10.29)</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.139.7.9.1.1"></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-good-plugins-plugin-spectrum.html#plugin-spectrum">spectrum</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Erik Walthinsen <omega@cse.ogi.edu>, Stefan Kost <ensonic@users.sf.net>, Sebastian Dröge <sebastian.droege@collabora.co.uk></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Analyzer/Audio</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.139.7.9.1.2"></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>sink</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</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, S24LE, S32LE, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved</td>
</tr>
</tbody>
</table></div>
<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, S24LE, S32LE, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.functions_details"></a><h2>Functions</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstSpectrum-struct"></a><h3>struct GstSpectrum</h3>
<pre class="programlisting">struct GstSpectrum;</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstSpectrum--bands"></a><h3>The <code class="literal">“bands”</code> property</h3>
<pre class="programlisting"> “bands” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Number of frequency bands.</p>
<p>Flags: Read / Write</p>
<p>Default value: 128</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSpectrum--interval"></a><h3>The <code class="literal">“interval”</code> property</h3>
<pre class="programlisting"> “interval” <span class="type">guint64</span></pre>
<p>Interval of time between message posts (in nanoseconds).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 1</p>
<p>Default value: 100000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSpectrum--message"></a><h3>The <code class="literal">“message”</code> property</h3>
<pre class="programlisting"> “message” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether to post a 'spectrum' element message on the bus for each passed interval (deprecated, use post-messages).</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSpectrum--threshold"></a><h3>The <code class="literal">“threshold”</code> property</h3>
<pre class="programlisting"> “threshold” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>dB threshold for result. All lower values will be set to this.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 0</p>
<p>Default value: -60</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSpectrum--message-magnitude"></a><h3>The <code class="literal">“message-magnitude”</code> property</h3>
<pre class="programlisting"> “message-magnitude” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether to add a 'magnitude' field to the structure of any 'spectrum' element messages posted on the bus.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSpectrum--message-phase"></a><h3>The <code class="literal">“message-phase”</code> property</h3>
<pre class="programlisting"> “message-phase” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether to add a 'phase' field to the structure of any 'spectrum' element messages posted on the bus.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
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<div class="refsect2">
<a name="GstSpectrum--post-messages"></a><h3>The <code class="literal">“post-messages”</code> property</h3>
<pre class="programlisting"> “post-messages” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether to post a 'spectrum' element message on the bus for each passed interval.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
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<div class="refsect2">
<a name="GstSpectrum--multi-channel"></a><h3>The <code class="literal">“multi-channel”</code> property</h3>
<pre class="programlisting"> “multi-channel” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Send separate results for each channel.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
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