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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>spectrum</title>
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<th width="100%" align="center">GStreamer Good Plugins 0.10 Plugins Reference Manual</th>
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</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#gst-plugins-good-plugins-spectrum.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#gst-plugins-good-plugins-spectrum.description" class="shortcut">Description</a>
                   | 
                  <a href="#gst-plugins-good-plugins-spectrum.object-hierarchy" class="shortcut">Object Hierarchy</a>
                   | 
                  <a href="#gst-plugins-good-plugins-spectrum.properties" class="shortcut">Properties</a>
</td></tr>
</table>
<div class="refentry">
<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 valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-good-plugins-spectrum.synopsis"></a><h2>Synopsis</h2>
<a name="GstSpectrum"></a><pre class="synopsis">struct              <a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum-struct" title="struct GstSpectrum">GstSpectrum</a>;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.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/gstreamer-0.10/GstObject.html">GstObject</a>
         +----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html">GstElement</a>
               +----<a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstBaseTransform.html">GstBaseTransform</a>
                     +----<a href="/usr/share/gtk-doc/html/gst-plugins-base-libs-0.10/gst-plugins-base-libs-gstaudiofilter.html#GstAudioFilter">GstAudioFilter</a>
                           +----GstSpectrum
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.properties"></a><h2>Properties</h2>
<pre class="synopsis">
  "<a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--bands" title='The "bands" property'>bands</a>"                    <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  "<a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--interval" title='The "interval" property'>interval</a>"                 <span class="type">guint64</span>               : Read / Write
  "<a class="link" href="gst-plugins-good-plugins-spectrum.html#GstSpectrum--message" title='The "message" property'>message</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-good-plugins-spectrum.html#GstSpectrum--threshold" title='The "threshold" property'>threshold</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-good-plugins-spectrum.html#GstSpectrum--message-magnitude" title='The "message-magnitude" property'>message-magnitude</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-good-plugins-spectrum.html#GstSpectrum--message-phase" title='The "message-phase" property'>message-phase</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-good-plugins-spectrum.html#GstSpectrum--post-messages" title='The "post-messages" property'>post-messages</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-good-plugins-spectrum.html#GstSpectrum--multi-channel" title='The "multi-channel" property'>multi-channel</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-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 application messages named
<code class="classname">"spectrum"</code> after each interval of time given
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" type="disc">
<li class="listitem"><p>
  <a href="/usr/share/gtk-doc/html/gstreamer-0.10/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-0.10/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-0.10/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-0.10/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-0.10/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>
</p>
<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-libs-0.10/GstControlSource.html#GstValueArray"><span class="type">GstValueArray</span></a>. The first dimension are the
channels and the second dimension are the values.
</p>
<p>
</p>
<div class="refsect2">
<a name="idp7775464"></a><h3>Example application</h3>
<div class="informalexample"><pre class="programlisting">
/* GStreamer
 * Copyright (C) 2006 Stefan Kost &lt;ensonic@users.sf.net&gt;
 * Copyright (C) 2008 Jan Schmidt &lt;jan.schmidt@sun.com&gt;
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include &lt;stdio.h&gt;
#include &lt;string.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;gst/gst.h&gt;

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-&gt;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", &amp;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 &lt; 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 &amp;&amp; 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 (&amp;argc, &amp;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,
      "message", 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-int",
      "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>
</p>
<p>
Last reviewed on 2011-03-10 (0.10.29)
</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="idp12451440"></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-good-plugins-plugin-spectrum.html#plugin-spectrum">spectrum</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Erik Walthinsen &lt;omega@cse.ogi.edu&gt;, Stefan Kost &lt;ensonic@users.sf.net&gt;, Sebastian Dröge &lt;sebastian.droege@collabora.co.uk&gt;</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="idp12468120"></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>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-int, width=(int)16, depth=(int)[ 1, 16 ], signed=(boolean)true, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-int, width=(int)24, depth=(int)[ 1, 24 ], signed=(boolean)true, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-int, width=(int)32, depth=(int)[ 1, 32 ], signed=(boolean)true, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
</tbody>
</table></div>
<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, width=(int)16, depth=(int)[ 1, 16 ], signed=(boolean)true, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-int, width=(int)24, depth=(int)[ 1, 24 ], signed=(boolean)true, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-int, width=(int)32, depth=(int)[ 1, 32 ], signed=(boolean)true, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-spectrum.details"></a><h2>Details</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>                 : Read / Write</pre>
<p>Number of frequency bands.</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>               : Read / Write</pre>
<p>Interval of time between message posts (in nanoseconds).</p>
<p>Allowed values: &gt;= 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>              : Read / Write</pre>
<p>Whether to post a 'spectrum' element message on the bus for each passed interval (deprecated, use post-messages).</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>                  : Read / Write</pre>
<p>dB threshold for result. All lower values will be set to this.</p>
<p>Allowed values: &lt;= 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>              : Read / Write</pre>
<p>Whether to add a 'magnitude' field to the structure of any 'spectrum' element messages posted on the bus.</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>              : Read / Write</pre>
<p>Whether to add a 'phase' field to the structure of any 'spectrum' element messages posted on the bus.</p>
<p>Default value: FALSE</p>
</div>
<hr>
<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>              : Read / Write</pre>
<p>
Post messages on the bus with spectrum information.
</p>
<p>Default value: TRUE</p>
<p class="since">Since 0.10.17</p>
</div>
<hr>
<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>              : Read / Write</pre>
<p>
Send separate results for each channel
</p>
<p>Default value: FALSE</p>
<p class="since">Since 0.10.29</p>
</div>
</div>
</div>
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