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<html>
<head>
<title>Tremor - Setup/Teardown</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>Setup/Teardown</h1> <p>In order to decode audio using
libvorbisidec, a bitstream containing Vorbis audio must be properly
initialized before decoding and cleared when decoding is finished.
The simplest possible case is to use <tt>fopen()</tt> to open a Vorbis
file and then pass the <tt>FILE *</tt> to an <a
href="ov_open.html">ov_open()</a> call. A successful <a
href="return.html">return code</a> from <a
href="ov_open.html">ov_open()</a> indicates the file is ready for use.
Once the file is no longer needed, <a
href="ov_clear.html">ov_clear()</a> is used to close the file and
deallocate decoding resources. </b>Do not</b> call <tt>fclose()</tt> on the
file; libvorbisidec does this in the <a
href="ov_clear.html">ov_clear()</a> call.
<p>
All libvorbisidec initialization and deallocation routines are declared in "ivorbisfile.h".
<p>
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<td><b>function</b></td>
<td><b>purpose</b></td>
</tr>
<tr valign=top>
<td><a href="ov_open.html">ov_open</a></td>
<td>Initializes the Ogg Vorbis bitstream with a pointer to a bitstream and default values. This must be called before other functions in the library may be
used.</td>
</tr>
<tr valign=top>
<td><a href="ov_open_callbacks.html">ov_open_callbacks</a></td>
<td>Initializes the Ogg Vorbis bitstream with a pointer to a bitstream, default values, and custom file/bitstream manipulation routines. Used instead of <a href="ov_open.html">ov_open()</a> when working with other than stdio based I/O.</td>
</tr>
<tr valign=top>
<td><a href="ov_test.html">ov_test</a></td>
<td>Partially opens a file just far enough to determine if the file
is an Ogg Vorbis file or not. A successful return indicates that the
file appears to be an Ogg Vorbis file, but the <a
href="OggVorbis_File.html">OggVorbis_File</a> struct is not yet fully
initialized for actual decoding. After a <a href="return.html">successful return</a>, the file
may be closed using <a href="ov_clear.html">ov_clear()</a> or fully
opened for decoding using <a
href="ov_test_open.html">ov_test_open()</a>.<p> This call is intended to
be used as a less expensive file open test than a full <a
href="ov_open.html">ov_open()</a>.<p>
Note that libvorbisidec owns the passed in file resource is it returns success; do not <tt>fclose()</tt> files owned by libvorbisidec.</td>
</tr>
<tr valign=top>
<td><a href="ov_test_callbacks.html">ov_test_callbacks</a></td>
<td>As above but allowing application-define I/O callbacks.<p>
Note that libvorbisidec owns the passed in file resource is it returns success; do not <tt>fclose()</tt> files owned by libvorbisidec.</td>
</tr>
<tr valign=top>
<td><a href="ov_test_open.html">ov_test_open</a><td>
Finish opening a file after a successful call to <a href="ov_test.html">ov_test()</a> or <a href="ov_test_callbacks.html">ov_test_callbacks()</a>.</td>
</tr>
<tr valign=top>
<td><a href="ov_clear.html">ov_clear</a></td> <td>Closes the
bitstream and cleans up loose ends. Must be called when
finished with the bitstream. After return, the <a
href="OggVorbis_File.html">OggVorbis_File</a> struct is
invalid and may not be used before being initialized again
before begin reinitialized.
</td>
</tr>
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<br><br>
<hr noshade>
<table border=0 width=100%>
<tr valign=top>
<td><p class=tiny>copyright © 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>
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