vorbis_encode_setup_vbr.html
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<title>libvorbisenc - function - vorbis_encode_setup_vbr</title>
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<td><p class=tiny>libvorbisenc documentation</p></td>
<td align=right><p class=tiny>libvorbisenc version 1.3.2 - 20101101</p></td>
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<h1>vorbis_encode_setup_vbr</h1>
<p><i>declared in "vorbis/vorbisenc.h";</i></p>
<p>This function performs step-one of a three-step variable bitrate
(quality-based) encode setup. It functions similarly to the one-step
setup performed by <a
href="vorbis_encode_init_vbr.html">vorbis_encode_init_vbr()</a> but
allows an application to make further encode setup tweaks using <a
href="vorbis_encode_ctl.html">vorbis_encode_ctl()</a> before finally
calling <a
href="vorbis_encode_setup_init.html">vorbis_encode_setup_init()</a> to
complete the setup process.
<p>Before this function is called, the <a href="../libvorbis/vorbis_info.html">vorbis_info</a> struct should be initialized by using vorbis_info_init() from the libvorbis API. After encoding, vorbis_info_clear should be called.
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<pre><b>
extern int vorbis_encode_init_vbr(<a href="../libvorbis/vorbis_info.html">vorbis_info</a> *vi,
long channels,
long rate,
float base_quality);
</b></pre>
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<h3>Parameters</h3>
<dl>
<dt><i>vi</i></dt>
<dd>Pointer to an initialized <a href="../libvorbis/vorbis_info.html">vorbis_info</a> struct.</dd>
<dt><i>channels</i></dt>
<dd>The number of channels to be encoded.</dd>
<dt><i>rate</i></dt>
<dd>The sampling rate of the source audio.</dd>
<dt><i>base_quality</i></dt>
<dd>Desired quality level, currently from -0.1 to 1.0 (lo to hi).</dd>
</dl>
<h3>Return Values</h3>
<blockquote>
<li>
0 for success</li>
<li>less than zero for failure:</li>
<ul>
<li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack corruption.</li>
<li>OV_EINVAL - Invalid setup request, eg, out of range argument. </li>
<li>OV_EIMPL - Unimplemented mode; unable to comply with quality level request.</li>
</ul>
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<td><p class=tiny>copyright © 2000-2010 Xiph.Org</p></td>
<td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/index.html">Ogg Vorbis</a></p></td>
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<td><p class=tiny>libvorbisenc documentation</p></td>
<td align=right><p class=tiny>libvorbisenc version 1.3.2 - 20101101</p></td>
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