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authorAki <please@ignore.pl>2021-09-29 22:52:49 +0200
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+<html>
+
+<head>
+<title>Vorbisfile - function - ov_test</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</h1>
+
+<p><i>declared in "vorbis/vorbisfile.h";</i></p>
+
+<p>
+This partially opens a vorbis file to test for Vorbis-ness. It loads
+the headers for the first chain and tests for seekability (but does
+not seek). Use <a href="ov_test_open.html">ov_test_open()</a> to
+finish opening the file or <a href="ov_clear.html">ov_clear</a> to
+close/free it. Note that vorbisfile does <b>not</b> take ownership of
+the file if the call fails; the calling applicaiton is responsible for
+closing the file if this call returns an error.
+<p>
+
+<p><em><b> WARNING for Windows developers: </b> Do not use ov_test()
+in Windows applications; Windows linking places restrictions on
+passing <tt>FILE *</tt> handles successfully, and ov_test() runs afoul
+of these restrictions <a href="#winfoot">[a]</a> in exactly the same
+way as <a href="ov_open.html">ov_open()</a>. See the <a
+href="ov_test_callbacks.html">ov_test_callbacks() page </a> for
+details on using <a
+href="ov_test_callbacks.html">ov_test_callbacks()</a> instead. </em>
+<p>
+
+<table border=0 color=black cellspacing=0 cellpadding=7>
+<tr bgcolor=#cccccc>
+ <td>
+<pre><b>
+int ov_test(FILE *f,<a href="OggVorbis_File.html">OggVorbis_File</a> *vf,char *initial,long ibytes);
+</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>
+</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>
+
+All the <a href="ov_open.html#notes">notes from ov_open()</a> apply to ov_test().
+
+<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>