<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>audioconvert</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-alsasrc.html" title="alsasrc"> <link rel="next" href="gst-plugins-base-plugins-audiorate.html" title="audiorate"> <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-alsasrc.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-audiorate.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-audioconvert.synopsis" class="shortcut">Top</a> | <a href="#gst-plugins-base-plugins-audioconvert.description" class="shortcut">Description</a> | <a href="#gst-plugins-base-plugins-audioconvert.object-hierarchy" class="shortcut">Object Hierarchy</a> | <a href="#gst-plugins-base-plugins-audioconvert.properties" class="shortcut">Properties</a> </td></tr> </table> <div class="refentry"> <a name="gst-plugins-base-plugins-audioconvert"></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-audioconvert.top_of_page"></a>audioconvert</span></h2> <p>audioconvert — Convert audio to different formats</p> </td> <td valign="top" align="right"></td> </tr></table></div> <div class="refsynopsisdiv"> <a name="gst-plugins-base-plugins-audioconvert.synopsis"></a><h2>Synopsis</h2> <a name="GstAudioConvert"></a><pre class="synopsis">struct <a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvert-struct" title="struct GstAudioConvert">GstAudioConvert</a>; enum <a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvertDithering" title="enum GstAudioConvertDithering">GstAudioConvertDithering</a>; enum <a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvertNoiseShaping" title="enum GstAudioConvertNoiseShaping">GstAudioConvertNoiseShaping</a>; </pre> </div> <div class="refsect1"> <a name="gst-plugins-base-plugins-audioconvert.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/GstBaseTransform.html">GstBaseTransform</a> +----GstAudioConvert </pre> </div> <div class="refsect1"> <a name="gst-plugins-base-plugins-audioconvert.properties"></a><h2>Properties</h2> <pre class="synopsis"> "<a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvert--dithering" title='The "dithering" property'>dithering</a>" <a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvertDithering" title="enum GstAudioConvertDithering"><span class="type">GstAudioConvertDithering</span></a> : Read / Write "<a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvert--noise-shaping" title='The "noise-shaping" property'>noise-shaping</a>" <a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvertNoiseShaping" title="enum GstAudioConvertNoiseShaping"><span class="type">GstAudioConvertNoiseShaping</span></a> : Read / Write </pre> </div> <div class="refsect1"> <a name="gst-plugins-base-plugins-audioconvert.description"></a><h2>Description</h2> <p> Audioconvert converts raw audio buffers between various possible formats. It supports integer to float conversion, width/depth conversion, signedness and endianness conversion and channel transformations. </p> <p> </p> <div class="refsect2"> <a name="idp9950880"></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 <span class="gtkdoc opt">-</span>v <span class="gtkdoc opt">-</span>m audiotestsrc <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> audio<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">-</span><span class="gtkdoc kwb">int</span><span class="gtkdoc opt">,</span>channels<span class="gtkdoc opt">=</span><span class="number">2</span><span class="gtkdoc opt">,</span>width<span class="gtkdoc opt">=</span><span class="number">8</span><span class="gtkdoc opt">,</span>depth<span class="gtkdoc opt">=</span><span class="number">8</span> <span class="gtkdoc opt">!</span> level <span class="gtkdoc opt">!</span> fakesink silent<span class="gtkdoc opt">=</span>TRUE</pre></td> </tr> </tbody> </table> </div> This pipeline converts audio to 8-bit. The level element shows that the output levels still match the one for a sine wave. <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 <span class="gtkdoc opt">-</span>v <span class="gtkdoc opt">-</span>m audiotestsrc <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> vorbisenc <span class="gtkdoc opt">!</span> fakesink silent<span class="gtkdoc opt">=</span>TRUE</pre></td> </tr> </tbody> </table> </div> The vorbis encoder takes float audio data instead of the integer data generated by audiotestsrc. </div> <p> </p> <p> Last reviewed on 2006-03-02 (0.10.4) </p> <div class="refsynopsisdiv"> <h2>Synopsis</h2> <div class="refsect2"> <a name="idp6613792"></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-audioconvert.html#plugin-audioconvert">audioconvert</a> </td> </tr> <tr> <td><p><span class="term">author</span></p></td> <td>Benjamin Otte <otte@gnome.org></td> </tr> <tr> <td><p><span class="term">class</span></p></td> <td>Filter/Converter/Audio</td> </tr> </tbody> </table></div> </div> <hr> <div class="refsect2"> <a name="idp5527392"></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-float, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)64</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-float, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)32</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)32, depth=(int)[ 1, 32 ], signed=(boolean){ true, false }</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)24, depth=(int)[ 1, 24 ], signed=(boolean){ true, false }</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)16, depth=(int)[ 1, 16 ], signed=(boolean){ true, false }</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)8, depth=(int)[ 1, 8 ], signed=(boolean){ true, false }</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-float, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)64</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-float, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)32</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)32, depth=(int)[ 1, 32 ], signed=(boolean){ true, false }</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)24, depth=(int)[ 1, 24 ], signed=(boolean){ true, false }</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)16, depth=(int)[ 1, 16 ], signed=(boolean){ true, false }</td> </tr> <tr> <td><p><span class="term"></span></p></td> <td> audio/x-raw-int, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], endianness=(int){ 1234, 4321 }, width=(int)8, depth=(int)[ 1, 8 ], signed=(boolean){ true, false }</td> </tr> </tbody> </table></div> </div> </div> <p> </p> </div> <div class="refsect1"> <a name="gst-plugins-base-plugins-audioconvert.details"></a><h2>Details</h2> <div class="refsect2"> <a name="GstAudioConvert-struct"></a><h3>struct GstAudioConvert</h3> <pre class="programlisting">struct GstAudioConvert;</pre> <p> The audioconvert object structure. </p> </div> <hr> <div class="refsect2"> <a name="GstAudioConvertDithering"></a><h3>enum GstAudioConvertDithering</h3> <pre class="programlisting">typedef enum { DITHER_NONE = 0, DITHER_RPDF, DITHER_TPDF, DITHER_TPDF_HF } GstAudioConvertDithering; </pre> <p> Set of available dithering methods when converting audio. </p> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><p><a name="DITHER-NONE:CAPS"></a><span class="term"><code class="literal">DITHER_NONE</code></span></p></td> <td>No dithering </td> </tr> <tr> <td><p><a name="DITHER-RPDF:CAPS"></a><span class="term"><code class="literal">DITHER_RPDF</code></span></p></td> <td>Rectangular dithering </td> </tr> <tr> <td><p><a name="DITHER-TPDF:CAPS"></a><span class="term"><code class="literal">DITHER_TPDF</code></span></p></td> <td>Triangular dithering (default) </td> </tr> <tr> <td><p><a name="DITHER-TPDF-HF:CAPS"></a><span class="term"><code class="literal">DITHER_TPDF_HF</code></span></p></td> <td>High frequency triangular dithering </td> </tr> </tbody> </table></div> </div> <hr> <div class="refsect2"> <a name="GstAudioConvertNoiseShaping"></a><h3>enum GstAudioConvertNoiseShaping</h3> <pre class="programlisting">typedef enum { NOISE_SHAPING_NONE = 0, NOISE_SHAPING_ERROR_FEEDBACK, NOISE_SHAPING_SIMPLE, NOISE_SHAPING_MEDIUM, NOISE_SHAPING_HIGH } GstAudioConvertNoiseShaping; </pre> <p> Set of available noise shaping methods </p> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><p><a name="NOISE-SHAPING-NONE:CAPS"></a><span class="term"><code class="literal">NOISE_SHAPING_NONE</code></span></p></td> <td>No noise shaping (default) </td> </tr> <tr> <td><p><a name="NOISE-SHAPING-ERROR-FEEDBACK:CAPS"></a><span class="term"><code class="literal">NOISE_SHAPING_ERROR_FEEDBACK</code></span></p></td> <td>Error feedback </td> </tr> <tr> <td><p><a name="NOISE-SHAPING-SIMPLE:CAPS"></a><span class="term"><code class="literal">NOISE_SHAPING_SIMPLE</code></span></p></td> <td>Simple 2-pole noise shaping </td> </tr> <tr> <td><p><a name="NOISE-SHAPING-MEDIUM:CAPS"></a><span class="term"><code class="literal">NOISE_SHAPING_MEDIUM</code></span></p></td> <td>Medium 5-pole noise shaping </td> </tr> <tr> <td><p><a name="NOISE-SHAPING-HIGH:CAPS"></a><span class="term"><code class="literal">NOISE_SHAPING_HIGH</code></span></p></td> <td>High 8-pole noise shaping </td> </tr> </tbody> </table></div> </div> </div> <div class="refsect1"> <a name="gst-plugins-base-plugins-audioconvert.property-details"></a><h2>Property Details</h2> <div class="refsect2"> <a name="GstAudioConvert--dithering"></a><h3>The <code class="literal">"dithering"</code> property</h3> <pre class="programlisting"> "dithering" <a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvertDithering" title="enum GstAudioConvertDithering"><span class="type">GstAudioConvertDithering</span></a> : Read / Write</pre> <p>Selects between different dithering methods.</p> <p>Default value: Triangular dithering (default)</p> </div> <hr> <div class="refsect2"> <a name="GstAudioConvert--noise-shaping"></a><h3>The <code class="literal">"noise-shaping"</code> property</h3> <pre class="programlisting"> "noise-shaping" <a class="link" href="gst-plugins-base-plugins-audioconvert.html#GstAudioConvertNoiseShaping" title="enum GstAudioConvertNoiseShaping"><span class="type">GstAudioConvertNoiseShaping</span></a> : Read / Write</pre> <p>Selects between different noise shaping methods.</p> <p>Default value: No noise shaping (default)</p> </div> </div> </div> <div class="footer"> <hr> Generated by GTK-Doc V1.18</div> </body> </html>