You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
5.0 KiB
118 lines
5.0 KiB
<html> |
|
|
|
<head> |
|
<title>Vorbisfile - 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>Vorbisfile documentation</p></td> |
|
<td align=right><p class=tiny>vorbisfile version 1.2.0 - 20070723</p></td> |
|
</tr> |
|
</table> |
|
|
|
<H1>Setup/Teardown</h1> <p>In order to decode audio using |
|
libvorbisfile, a bitstream containing Vorbis audio must be properly |
|
initialized before decoding and cleared when decoding is finished. |
|
The simplest possible case is to use <a |
|
href="ov_fopen.html">ov_fopen()</a> to open the file for access, check |
|
it for Vorbis content, and prepare it for playback. A successful <a |
|
href="return.html">return code</a> from <a |
|
href="ov_fopen.html">ov_fopen()</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.<p> |
|
|
|
On systems other than Windows<a href="ov_open.html#winfoot">[a]</a>, an |
|
application may also open a file itself using <tt>fopen()</tt>, then pass the |
|
<tt>FILE *</tt> to libvorbisfile using <a |
|
href="ov_open.html">ov_open()</a>. </b>Do not</b> call |
|
<tt>fclose()</tt> on a file handle successfully submitted to <a |
|
href="ov_open.html">ov_open()</a>; libvorbisfile does this in the <a |
|
href="ov_clear.html">ov_clear()</a> call.<p> |
|
|
|
An application that requires more setup flexibility may open a data |
|
stream using <a href="ov_open_callbacks.html">ov_open_callbacks()</a> |
|
to change default libvorbis behavior or specify non-stdio data access |
|
mechanisms.<p> |
|
|
|
<p> |
|
All libvorbisfile initialization and deallocation routines are declared in "vorbis/vorbisfile.h". |
|
<p> |
|
|
|
<table border=1 color=black width=50% cellspacing=0 cellpadding=7> |
|
<tr bgcolor=#cccccc> |
|
<td><b>function</b></td> |
|
<td><b>purpose</b></td> |
|
</tr> |
|
<tr valign=top> |
|
<td><a href="ov_fopen.html">ov_fopen</a></td> |
|
<td>Opens a file and initializes the Ogg Vorbis bitstream with 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.html">ov_open</a></td> |
|
<td>Initializes the Ogg Vorbis bitstream with default values from a passed in file handle. This must be called before other functions in the library may be |
|
used. <a href="#winfoot"><em>Do not use this call under Windows [a];</em></a> Use <a href="ov_fopen.html">ov_fopen()</a> or <a href="ov_open_callbacks.html">ov_open_callbacks()</a> instead.</td> |
|
</tr> |
|
<tr valign=top> |
|
<td><a href="ov_open_callbacks.html">ov_open_callbacks</a></td> |
|
<td>Initializes the Ogg Vorbis bitstream from a file handle and custom file/bitstream manipulation routines. Used instead of <a href="ov_open.html">ov_open()</a> or <a href="ov_fopen.html">ov_fopen()</a> when altering or replacing libvorbis's default stdio I/O behavior, or when a bitstream must be initialized from a <tt>FILE *</tt> under Windows.</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 libvorbisfile owns the passed in file resource is it returns success; do not <tt>fclose()</tt> files owned by libvorbisfile.</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 libvorbisfile owns the passed in file resource is it returns success; do not <tt>fclose()</tt> files owned by libvorbisfile.</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> |
|
</table> |
|
|
|
<br><br> |
|
<hr noshade> |
|
|
|
<table border=0 width=100%> |
|
<tr valign=top> |
|
<td><p class=tiny>copyright © 2007 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 1.2.0 - 20070723</p></td> |
|
</tr> |
|
</table> |
|
|
|
</body> |
|
|
|
</html>
|
|
|