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-<html>
-
-<head>
-<title>Vorbisfile - 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>Vorbisfile documentation</p></td>
-<td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td>
-</tr>
-</table>
-
-<h1>ov_test_callbacks</h1>
-
-<p><i>declared in "vorbis/vorbisfile.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,
-when its necessary to modify default file access behavior, or to
-test for Vorbis content from a <tt>FILE *</tt> pointer under
-Windows where <a href="ov_open.html">ov_test()</a> cannot be used. It
-allows the application 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 libvorbisfile 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 libvorbisfile
-functions. Once this has been called, the same <tt>OggVorbis_File</tt>
-struct should be passed to all the libvorbisfile 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>A completed <a href="ov_callbacks.html">ov_callbacks</a> struct which indicates desired custom file manipulation routines. vorbisfile.h defines several preprovided callback sets; see <a href="ov_callbacks.html">ov_callbacks</a> for details.</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 contains no 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>
-
-<h3>Notes</h3>
-<dl>
-
-<dt><b>[a] Windows and use as an ov_test() substitute</b><p> Windows
-applications should not use <a href="ov_test.html">ov_test()</a> due
-to the likelihood of <a href="ov_open.html#winfoot">CRT linking
-mismatches and runtime protection faults
-[ov_open:a]</a>. ov_test_callbacks() is a safe substitute; specifically:
-
-<pre><tt>ov_test_callbacks(f, vf, initial, ibytes, OV_CALLBACKS_DEFAULT);</tt>
-</pre>
-
-... provides exactly the same functionality as <a
-href="ov_test.html">ov_test()</a> but will always work correctly under
-Windows, regardless of linking setup details.<p>
-
-</dl>
-
-<br><br>
-<hr noshade>
-<table border=0 width=100%>
-<tr valign=top>
-<td><p class=tiny>copyright &copy; 2000-2010 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>Vorbisfile documentation</p></td>
-<td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td>
-</tr>
-</table>
-
-</body>
-
-</html>