vorbis/doc/vorbisenc/vorbis_encode_init_vbr.html

   1 <html>
   2
   3 <head>
   4 <title>libvorbisenc - function - vorbis_encode_init_vbr</title>
   5 <link rel=stylesheet href="style.css" type="text/css">
   6 </head>
   7
   8 <body bgcolor=white text=black link="#5555ff" alink="#5555ff" vlink="#5555ff">
   9 <table border=0 width=100%>
  10 <tr>
  11 <td><p class=tiny>libvorbisenc documentation</p></td>
  12 <td align=right><p class=tiny>libvorbisenc version 1.3.2 - 20101101</p></td>
  13 </tr>
  14 </table>
  15
  16 <h1>vorbis_encode_init_vbr</h1>
  17
  18 <p><i>declared in "vorbis/vorbisenc.h";</i></p>
  19
  20 <p>This is the primary function within libvorbisenc for setting up variable bitrate ("quality" based) modes.
  21 <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.
  22 <p>
  23 <br><br>
  24 <table border=0 color=black cellspacing=0 cellpadding=7>
  25 <tr bgcolor=#cccccc>
  26         <td>
  27 <pre><b>
  28 extern int vorbis_encode_init_vbr(<a href="../libvorbis/vorbis_info.html">vorbis_info</a> *vi,
  29                               long channels,
  30                               long rate,
  31
  32                               float base_quality);
  33
  34 </b></pre>
  35         </td>
  36 </tr>
  37 </table>
  38
  39 <h3>Parameters</h3>
  40 <dl>
  41 <dt><i>vi</i></dt>
  42 <dd>Pointer to an initialized <a href="../libvorbis/vorbis_info.html">vorbis_info</a> struct.</dd>
  43 <dt><i>channels</i></dt>
  44 <dd>The number of channels to be encoded.</dd>
  45 <dt><i>rate</i></dt>
  46 <dd>The sampling rate of the source audio.</dd>
  47 <dt><i>base_quality</i></dt>
  48 <dd>Desired quality level, currently from -0.1 to 1.0 (lo to hi).</dd>
  49 </dl>
  50
  51
  52 <h3>Return Values</h3>
  53 <blockquote>
  54 <li>
  55 0 for success</li>
  56
  57 <li>less than zero for failure:</li>
  58 <ul>
  59 <li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack corruption.</li>
  60 <li>OV_EINVAL - Invalid setup request, eg, out of range argument. </li>
  61 <li>OV_EIMPL  - Unimplemented mode; unable to comply with quality level request.</li>
  62 </ul>
  63 </blockquote>
  64 <p>
  65
  66 <br><br>
  67 <hr noshade>
  68 <table border=0 width=100%>
  69 <tr valign=top>
  70 <td><p class=tiny>copyright &copy; 2000-2010 Xiph.Org</p></td>
  71 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/index.html">Ogg Vorbis</a></p></td>
  72 </tr><tr>
  73 <td><p class=tiny>libvorbisenc documentation</p></td>
  74 <td align=right><p class=tiny>libvorbisenc version 1.3.2 - 20101101</p></td>
  75 </tr>
  76 </table>
  77
  78
  79 </body>
  80
  81 </html>