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+<html>
+
+<head>
+<title>Tremor - function - ov_test_callbacks</title>
+<link rel=stylesheet href="style.css" type="text/css">
+</head>
+
+<body bgcolor=white text=black link="#5555ff" alink="#5555ff" vlink="#5555ff">
+<table border=0 width=100%>
+<tr>
+<td><p class=tiny>Tremor documentation</p></td>
+<td align=right><p class=tiny>Tremor version 1.0 - 20020403</p></td>
+</tr>
+</table>
+
+<h1>ov_test_callbacks</h1>
+
+<p><i>declared in "ivorbisfile.h";</i></p>
+
+<p>This is an alternative function used to open and test an OggVorbis_File
+structure when using a data source other than a file. It allows you to specify custom file manipulation routines and sets up all the related decoding structures.
+<p>Once this has been called, the same <tt>OggVorbis_File</tt>
+struct should be passed to all the libvorbisidec functions.
+<p>
+<br><br>
+<table border=0 color=black cellspacing=0 cellpadding=7>
+<tr bgcolor=#cccccc>
+ <td>
+<pre><b>
+int ov_test_callbacks(void *datasource, <a href="OggVorbis_File.html">OggVorbis_File</a> *vf, char *initial, long ibytes, <a href="ov_callbacks.html">ov_callbacks</a> callbacks);
+</b></pre>
+ </td>
+</tr>
+</table>
+
+<h3>Parameters</h3>
+<dl>
+<dt><i>f</i></dt>
+<dd>File pointer to an already opened file
+or pipe (it need not be seekable--though this obviously restricts what
+can be done with the bitstream).</dd>
+<dt><i>vf</i></dt>
+<dd>A pointer to the OggVorbis_File structure--this is used for ALL the externally visible libvorbisidec
+functions. Once this has been called, the same <tt>OggVorbis_File</tt>
+struct should be passed to all the libvorbisidec functions.</dd>
+<dt><i>initial</i></dt>
+<dd>Typically set to NULL. This parameter is useful if some data has already been
+read from the file and the stream is not seekable. It is used in conjunction with <tt>ibytes</tt>. In this case, <tt>initial</tt>
+should be a pointer to a buffer containing the data read.</dd>
+<dt><i>ibytes</i></dt>
+<dd>Typically set to 0. This parameter is useful if some data has already been
+read from the file and the stream is not seekable. In this case, <tt>ibytes</tt>
+should contain the length (in bytes) of the buffer. Used together with <tt>initial</tt>.</dd>
+<dt><i>callbacks</i></dt>
+<dd>Pointer to a completed <a href="ov_callbacks.html">ov_callbacks</a> struct which indicates desired custom file manipulation routines.</dd>
+</dl>
+
+
+<h3>Return Values</h3>
+<blockquote>
+<li>0 for success</li>
+<li>less than zero for failure:</li>
+<ul>
+<li>OV_EREAD - A read from media returned an error.</li>
+<li>OV_ENOTVORBIS - Bitstream is not Vorbis data.</li>
+<li>OV_EVERSION - Vorbis version mismatch.</li>
+<li>OV_EBADHEADER - Invalid Vorbis bitstream header.</li>
+<li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack corruption.</li>
+</ul>
+</blockquote>
+<p>
+
+
+
+
+<br><br>
+<hr noshade>
+<table border=0 width=100%>
+<tr valign=top>
+<td><p class=tiny>copyright &copy; 2002 Xiph.org</p></td>
+<td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a></p></td>
+</tr><tr>
+<td><p class=tiny>Tremor documentation</p></td>
+<td align=right><p class=tiny>Tremor version 1.0 - 20020403</p></td>
+</tr>
+</table>
+
+</body>
+
+</html>