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- <html>
- <head>
- <title>Vorbisfile - function - ov_crosslap</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>ov_crosslap()</h1>
- <p><i>declared in "vorbis/vorbisfile.h";</i></p>
- <p>ov_crosslap overlaps and blends the boundary at a transition
- between two separate streams represented by separate <a
- href="OggVorbis_File.html">OggVorbis_File</a> structures. For lapping
- transitions due to seeking within a single stream represented by a
- single <a href="OggVorbis_File.html">OggVorbis_File</a> structure,
- consider using the lapping versions of the <a
- href="seeking.html">vorbisfile seeking functions</a> instead.
- <p>ov_crosslap is used between the last (usually ov_read) call on
- the old stream and the first ov_read from the new stream. Any
- desired positioning of the new stream must occur before the call to
- ov_crosslap() as a seek dumps all prior lapping information from a
- stream's decode state. Crosslapping does not introduce or remove any
- extraneous samples; positioning works exactly as if ov_crosslap was not
- called.
- <p>ov_crosslap will lap between streams of differing numbers of
- channels. Any extra channels from the old stream are ignored; playback
- of these channels simply ends. Extra channels in the new stream are
- lapped from silence. ov_crosslap will also lap between streams links
- of differing sample rates. In this case, the sample rates are ignored
- (no implicit resampling is done to match playback). It is up to the
- application developer to decide if this behavior makes any sense in a
- given context; in practical use, these default behaviors perform
- sensibly.
- <br><br>
- <table border=0 color=black cellspacing=0 cellpadding=7>
- <tr bgcolor=#cccccc>
- <td>
- <pre><b>
- long ov_crosslap(<a href="OggVorbis_File.html">OggVorbis_File</a> *old, <a href="OggVorbis_File.html">OggVorbis_File</a> *new);
- </b></pre>
- </td>
- </tr>
- </table>
- <h3>Parameters</h3>
- <dl>
- <dt><i>old</i></dt>
- <dd>A pointer to the OggVorbis_File structure representing the origin stream from which to transition playback.</dd>
- <dt><i>new</i></dt>
- <dd>A pointer to the OggVorbis_File structure representing the stream with which playback continues.</dd>
- </dl>
- <h3>Return Values</h3>
- <blockquote>
- <dl>
- <dt>OV_EINVAL</dt>
- <dd>crosslap called with an OggVorbis_File structure that isn't open.</dd>
- <dt>OV_EFAULT</dt>
- <dd>internal error; implies a library bug or external heap corruption.</dd>
- <dt>OV_EREAD</dt>
- <dd> A read from media returned an error.</dd>
- <dt>OV_EOF</dt>
- <dd>indicates stream <tt>vf2</tt> is at end of file, or that <tt>vf1</tt> is at end of file immediately after a seek (making crosslap impossible as there's no preceding decode state to crosslap).</dd>
- <dt><i>0</i></dt>
- <dd>success.</dd>
- </dl>
- </blockquote>
- <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>
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