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<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="id-1.2"></a>gst-plugins-good Elements</h1></div></div></div>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-3gppmux.html">3gppmux</a></span><span class="refpurpose"> — Muxer for 3GPP (.3gp) files</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-aacparse.html">aacparse</a></span><span class="refpurpose"> — AAC parser</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-aasink.html">aasink</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-ac3parse.html">ac3parse</a></span><span class="refpurpose"> — AC3 parser</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-agingtv.html">agingtv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-alawdec.html">alawdec</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-alawenc.html">alawenc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-alphacolor.html">alphacolor</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-alpha.html">alpha</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-amrparse.html">amrparse</a></span><span class="refpurpose"> — AMR parser</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-apedemux.html">apedemux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-apev2mux.html">apev2mux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-aspectratiocrop.html">aspectratiocrop</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-asteriskh263.html">asteriskh263</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audioamplify.html">audioamplify</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiochebband.html">audiochebband</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiocheblimit.html">audiocheblimit</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiodynamic.html">audiodynamic</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audioecho.html">audioecho</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiofirfilter.html">audiofirfilter</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audioiirfilter.html">audioiirfilter</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audioinvert.html">audioinvert</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiokaraoke.html">audiokaraoke</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiopanorama.html">audiopanorama</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiowsincband.html">audiowsincband</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-audiowsinclimit.html">audiowsinclimit</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-auparse.html">auparse</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-autoaudiosink.html">autoaudiosink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-autoaudiosrc.html">autoaudiosrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-autovideosink.html">autovideosink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-autovideosrc.html">autovideosrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-avidemux.html">avidemux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-avimux.html">avimux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-avisubtitle.html">avisubtitle</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-breakmydata.html">breakmydata</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-cacasink.html">cacasink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-cairooverlay.html">cairooverlay</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-capssetter.html">capssetter</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-cpureport.html">cpureport</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-cutter.html">cutter</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-dcaparse.html">dcaparse</a></span><span class="refpurpose"> — DCA (DTS Coherent Acoustics) parser</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-deinterlace.html">deinterlace</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-deinterleave.html">deinterleave</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-dicetv.html">dicetv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-directsoundsink.html">directsoundsink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-dtmfsrc.html">dtmfsrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-dv1394src.html">dv1394src</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-dvdec.html">dvdec</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-dvdemux.html">dvdemux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-dynudpsink.html">dynudpsink</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-edgetv.html">edgetv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-equalizer-10bands.html">equalizer-10bands</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-equalizer-3bands.html">equalizer-3bands</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-equalizer-nbands.html">equalizer-nbands</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-flacdec.html">flacdec</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-flacenc.html">flacenc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-flacparse.html">flacparse</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-flactag.html">flactag</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-flvdemux.html">flvdemux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-flvmux.html">flvmux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-flxdec.html">flxdec</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-gamma.html">gamma</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-gdkpixbufdec.html">gdkpixbufdec</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-gdkpixbufoverlay.html">gdkpixbufoverlay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-gdkpixbufsink.html">gdkpixbufsink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-goom2k1.html">goom2k1</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-goom.html">goom</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-hdv1394src.html">hdv1394src</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-icydemux.html">icydemux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-id3demux.html">id3demux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-id3v2mux.html">id3v2mux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-iirequalizer.html">iirequalizer</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-imagefreeze.html">imagefreeze</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-interleave.html">interleave</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-ismlmux.html">ismlmux</a></span><span class="refpurpose"> — Muxer for ISML smooth streaming (.isml) files</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-jackaudiosink.html">jackaudiosink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-jackaudiosrc.html">jackaudiosrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-jpegdec.html">jpegdec</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-jpegenc.html">jpegenc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-level.html">level</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-matroskademux.html">matroskademux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-matroskamux.html">matroskamux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-matroskaparse.html">matroskaparse</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-mj2mux.html">mj2mux</a></span><span class="refpurpose"> — Muxer for Motion JPEG-2000 (.mj2) files</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-monoscope.html">monoscope</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-mp4mux.html">mp4mux</a></span><span class="refpurpose"> — Muxer for ISO MPEG-4 (.mp4) files</span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-mpegaudioparse.html">mpegaudioparse</a></span><span class="refpurpose"> — MPEG audio parser</span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-mulawdec.html">mulawdec</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-mulawenc.html">mulawenc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-multifilesink.html">multifilesink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-multifilesrc.html">multifilesrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-multipartdemux.html">multipartdemux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-multipartmux.html">multipartmux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-multiudpsink.html">multiudpsink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-navigationtest.html">navigationtest</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-navseek.html">navseek</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-optv.html">optv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-oss4sink.html">oss4sink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-oss4src.html">oss4src</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-osssink.html">osssink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-osssrc.html">osssrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-osxaudiosink.html">osxaudiosink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-osxaudiosrc.html">osxaudiosrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-osxvideosink.html">osxvideosink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-pngdec.html">pngdec</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-pngenc.html">pngenc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-progressreport.html">progressreport</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-pulsesink.html">pulsesink</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-pulsesrc.html">pulsesrc</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-pushfilesrc.html">pushfilesrc</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-qtdemux.html">qtdemux</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-qtmoovrecover.html">qtmoovrecover</a></span><span class="refpurpose"> — Utility element for recovering unfinished quicktime files</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-qtmux.html">qtmux</a></span><span class="refpurpose"> — Muxer for quicktime(.mov) files</span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-quarktv.html">quarktv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-radioactv.html">radioactv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-revtv.html">revtv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rganalysis.html">rganalysis</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rglimiter.html">rglimiter</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rgvolume.html">rgvolume</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rippletv.html">rippletv</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rndbuffersize.html">rndbuffersize</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpac3depay.html">rtpac3depay</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpac3pay.html">rtpac3pay</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpamrdepay.html">rtpamrdepay</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpamrpay.html">rtpamrpay</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpbin.html">rtpbin</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpbvdepay.html">rtpbvdepay</a></span><span class="refpurpose"></span>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpbvpay.html">rtpbvpay</a></span><span class="refpurpose"></span>
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<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpceltdepay.html">rtpceltdepay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpceltpay.html">rtpceltpay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpdec.html">rtpdec</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpdtmfdepay.html">rtpdtmfdepay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpdtmfmux.html">rtpdtmfmux</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpdtmfsrc.html">rtpdtmfsrc</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpdvdepay.html">rtpdvdepay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpdvpay.html">rtpdvpay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg722depay.html">rtpg722depay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg722pay.html">rtpg722pay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg723depay.html">rtpg723depay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg723pay.html">rtpg723pay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg726depay.html">rtpg726depay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg726pay.html">rtpg726pay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg729depay.html">rtpg729depay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpg729pay.html">rtpg729pay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpgsmdepay.html">rtpgsmdepay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpgsmpay.html">rtpgsmpay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpgstdepay.html">rtpgstdepay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtpgstpay.html">rtpgstpay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtph261depay.html">rtph261depay</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="gst-plugins-good-plugins-rtph261pay.html">rtph261pay</a></span><span class="refpurpose"></span>
</dt>
<dt>
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<pre class="programlisting">
/* GStreamer
* Copyright (C) 2009 Sebastian Droege <sebastian.droege@collabora.co.uk>
*
* 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.
*/
/* This small sample application creates a bandpass FIR filter
* by transforming the frequency response to the filter kernel.
*/
/* FIXME 0.11: suppress warnings for deprecated API such as GValueArray
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gst/fft/gstfftf64.h>
static gboolean
on_message (GstBus * bus, GstMessage * message, gpointer user_data)
{
GMainLoop *loop = (GMainLoop *) user_data;
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:
g_error ("Got ERROR");
g_main_loop_quit (loop);
break;
case GST_MESSAGE_WARNING:
g_warning ("Got WARNING");
g_main_loop_quit (loop);
break;
case GST_MESSAGE_EOS:
g_main_loop_quit (loop);
break;
default:
break;
}
return TRUE;
}
static void
on_rate_changed (GstElement * element, gint rate, gpointer user_data)
{
GValueArray *va;
GValue v = { 0, };
GstFFTF64 *fft;
GstFFTF64Complex frequency_response[17];
gdouble tmp[32];
gdouble filter_kernel[32];
guint i;
/* Create the frequency response: zero outside
* a small frequency band */
for (i = 0; i < 17; i++) {
if (i < 5 || i > 11)
frequency_response[i].r = 0.0;
else
frequency_response[i].r = 1.0;
frequency_response[i].i = 0.0;
}
/* Calculate the inverse FT of the frequency response */
fft = gst_fft_f64_new (32, TRUE);
gst_fft_f64_inverse_fft (fft, frequency_response, tmp);
gst_fft_f64_free (fft);
/* Shift the inverse FT of the frequency response by 16,
* i.e. the half of the kernel length to get the
* impulse response. See http://www.dspguide.com/ch17/1.htm
* for more information.
*/
for (i = 0; i < 32; i++)
filter_kernel[i] = tmp[(i + 16) % 32];
/* Apply the hamming window to the impulse response to get
* a better result than given from the rectangular window
*/
for (i = 0; i < 32; i++)
filter_kernel[i] *= (0.54 - 0.46 * cos (2 * G_PI * i / 32));
va = g_value_array_new (1);
g_value_init (&v, G_TYPE_DOUBLE);
for (i = 0; i < 32; i++) {
g_value_set_double (&v, filter_kernel[i]);
g_value_array_append (va, &v);
g_value_reset (&v);
}
g_object_set (G_OBJECT (element), "kernel", va, NULL);
/* Latency is 1/2 of the kernel length for this method of
* calculating a filter kernel from the frequency response
*/
g_object_set (G_OBJECT (element), "latency", (gint64) (32 / 2), NULL);
g_value_array_free (va);
}
gint
main (gint argc, gchar * argv[])
{
GstElement *pipeline, *src, *filter, *conv, *sink;
GstBus *bus;
GMainLoop *loop;
gst_init (NULL, NULL);
pipeline = gst_element_factory_make ("pipeline", NULL);
src = gst_element_factory_make ("audiotestsrc", NULL);
g_object_set (G_OBJECT (src), "wave", 5, NULL);
filter = gst_element_factory_make ("audiofirfilter", NULL);
g_signal_connect (G_OBJECT (filter), "rate-changed",
G_CALLBACK (on_rate_changed), NULL);
conv = gst_element_factory_make ("audioconvert", NULL);
sink = gst_element_factory_make ("autoaudiosink", NULL);
g_return_val_if_fail (sink != NULL, -1);
gst_bin_add_many (GST_BIN (pipeline), src, filter, conv, sink, NULL);
if (!gst_element_link_many (src, filter, conv, sink, NULL)) {
g_error ("Failed to link elements");
return -2;
}
loop = g_main_loop_new (NULL, FALSE);
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_add_signal_watch (bus);
g_signal_connect (G_OBJECT (bus), "message", G_CALLBACK (on_message), loop);
gst_object_unref (GST_OBJECT (bus));
if (gst_element_set_state (pipeline,
GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
g_error ("Failed to go into PLAYING state");
return -3;
}
g_main_loop_run (loop);
gst_element_set_state (pipeline, GST_STATE_NULL);
g_main_loop_unref (loop);
gst_object_unref (pipeline);
return 0;
}
</pre>
<pre class="programlisting">
/* GStreamer
* Copyright (C) 2009 Sebastian Droege <sebastian.droege@collabora.co.uk>
*
* 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,