4 <title>Vorbisfile - function - ov_test</title>
5 <link rel=stylesheet href="style.css" type="text/css">
8 <body bgcolor=white text=black link="#5555ff" alink="#5555ff" vlink="#5555ff">
9 <table border=0 width=100%>
11 <td><p class=tiny>Vorbisfile documentation</p></td>
12 <td align=right><p class=tiny>libVorbisfile version 1.65 - 20020702</p></td>
18 <p><i>declared in "vorbis/vorbisfile.h";</i></p>
21 This partially opens a vorbis file to test for Vorbis-ness. It loads
22 the headers for the first chain, and tests for seekability (but does not seek).
23 Use <a href="ov_test_open.html">ov_test_open()</a> to finish opening the file
24 or <a href="ov_clear.html">ov_clear</a> to close/free it.
27 <table border=0 color=black cellspacing=0 cellpadding=7>
31 int ov_test(FILE *f,<a href="OggVorbis_File.html">OggVorbis_File</a> *vf,char *initial,long ibytes);
40 <dd>File pointer to an already opened file
41 or pipe (it need not be seekable--though this obviously restricts what
42 can be done with the bitstream).</dd>
44 <dd>A pointer to the OggVorbis_File structure--this is used for ALL the externally visible libvorbisfile
45 functions. Once this has been called, the same <tt>OggVorbis_File</tt>
46 struct should be passed to all the libvorbisfile functions.</dd>
47 <dt><i>initial</i></dt>
48 <dd>Typically set to NULL. This parameter is useful if some data has already been
49 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>
50 should be a pointer to a buffer containing the data read.</dd>
51 <dt><i>ibytes</i></dt>
52 <dd>Typically set to 0. This parameter is useful if some data has already been
53 read from the file and the stream is not seekable. In this case, <tt>ibytes</tt>
54 should contain the length (in bytes) of the buffer. Used together with <tt>initial</tt></dd>
58 <h3>Return Values</h3>
60 <li>0 for success</li>
62 <li>less than zero for failure:</li>
64 <li>OV_EREAD - A read from media returned an error.</li>
65 <li>OV_ENOTVORBIS - Bitstream is not Vorbis data.</li>
66 <li>OV_EVERSION - Vorbis version mismatch.</li>
67 <li>OV_EBADHEADER - Invalid Vorbis bitstream header.</li>
68 <li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack corruption.</li>
77 <table border=0 width=100%>
79 <td><p class=tiny>copyright © 2002 Xiph.org</p></td>
80 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a></p></td>
82 <td><p class=tiny>Vorbisfile documentation</p></td>
83 <td align=right><p class=tiny>libVorbisfile version 1.65 - 20020702</p></td>