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<title>libvorbis - datatype - vorbis_comment</title>
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<td><p class=tiny>libvorbis documentation</p></td>
<td align=right><p class=tiny>libvorbis version 1.3.2 - 20101101</p></td>
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<h1>vorbis_comment</h1>

<p><i>declared in "vorbis/codec.h"</i></p>

<p>
The vorbis_comment structure defines an Ogg Vorbis comment.
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Only the fields the program needs must be defined.  If a field isn't
defined by the application, it will either be blank (if it's a string value)
or set to some reasonable default (usually 0).
<p>
<i>Note:</i> When encoding, while it <i>is</i> supported to modify a
vorbis_comment structure directly, be sure to read the notes on the
<a href="vorbis_comment_init.html">vorbis_comment_init</a> and
<a href="vorbis_comment_clear.html">vorbis_comment_clear</a> pages for
considerations on memory allocation and freeing before you do so. Rule of
thumb: call vorbis_comment_init, then <i>either</i> do all allocation,
freeing, and modification yourself and <i>do not</i> call
vorbis_comment_clear, <i>or</i> do all modification using libvorbis
functions and <i>do</i> call vorbis_comment_clear.
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<pre><b>typedef struct vorbis_comment{
  /* unlimited user comment fields. */
  char **user_comments;
  int  *comment_lengths;
  int  comments;
  char *vendor;

} vorbis_comment;</b></pre>
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<h3>Parameters</h3>
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<dt><i>user_comments</i></dt>
<dd>Unlimited user comment array. The individual strings in the array are 8 bit clean, by the Vorbis specification, and as such the <tt>comment_lengths</tt> array should be consulted to determine string length.  For convenience, each string is also NULL-terminated by the decode library (although Vorbis comments are not NULL terminated within the bitstream itself).</dd>
<dt><i>comment_lengths</i></dt>
<dd>An int array that stores the length of each comment string</dd>
<dt><i>comments</i></dt>
<dd>Int signifying number of user comments in user_comments field.</dd>
<dt><i>vendor</i></dt>
<dd>Information about the Vorbis implementation that encoded the file.  Stored in a standard C 0-terminated string. Libvorbis will fill this in itself when encoding a comment packet from this structure; when decoding, this contains the vendor string that was in the comment packet.</dd>
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<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>
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<td><p class=tiny>libvorbis documentation</p></td>
<td align=right><p class=tiny>libvorbis version 1.3.2 - 20101101</p></td>
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author	Chris Cannam
date	Tue, 19 Mar 2013 17:37:49 +0000
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