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| 3 | <head>
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| 4 | <title>Vorbisfile - function - ov_crosslap</title>
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| 5 | <link rel=stylesheet href="style.css" type="text/css">
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| 6 | </head>
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| 7 |
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| 8 | <body bgcolor=white text=black link="#5555ff" alink="#5555ff" vlink="#5555ff">
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| 9 | <table border=0 width=100%>
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| 10 | <tr>
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| 11 | <td><p class=tiny>Vorbisfile documentation</p></td>
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| 12 | <td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td>
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| 13 | </tr>
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| 14 | </table>
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| 15 |
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| 16 | <h1>ov_crosslap()</h1>
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| 17 |
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| 18 | <p><i>declared in "vorbis/vorbisfile.h";</i></p>
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| 19 |
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| 20 | <p>ov_crosslap overlaps and blends the boundary at a transition
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| 21 | between two separate streams represented by separate <a
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| 22 | href="OggVorbis_File.html">OggVorbis_File</a> structures. For lapping
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| 23 | transitions due to seeking within a single stream represented by a
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| 24 | single <a href="OggVorbis_File.html">OggVorbis_File</a> structure,
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| 25 | consider using the lapping versions of the <a
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| 26 | href="seeking.html">vorbisfile seeking functions</a> instead.
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| 27 |
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| 28 | <p>ov_crosslap is used between the last (usually ov_read) call on
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| 29 | the old stream and the first ov_read from the new stream. Any
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| 30 | desired positioning of the new stream must occur before the call to
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| 31 | ov_crosslap() as a seek dumps all prior lapping information from a
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| 32 | stream's decode state. Crosslapping does not introduce or remove any
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| 33 | extraneous samples; positioning works exactly as if ov_crosslap was not
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| 34 | called.
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| 35 |
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| 36 | <p>ov_crosslap will lap between streams of differing numbers of
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| 37 | channels. Any extra channels from the old stream are ignored; playback
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| 38 | of these channels simply ends. Extra channels in the new stream are
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| 39 | lapped from silence. ov_crosslap will also lap between streams links
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| 40 | of differing sample rates. In this case, the sample rates are ignored
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| 41 | (no implicit resampling is done to match playback). It is up to the
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| 42 | application developer to decide if this behavior makes any sense in a
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| 43 | given context; in practical use, these default behaviors perform
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| 44 | sensibly.
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| 45 |
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| 46 | <br><br>
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| 47 | <table border=0 color=black cellspacing=0 cellpadding=7>
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| 48 | <tr bgcolor=#cccccc>
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| 49 | <td>
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| 50 | <pre><b>
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| 51 | long ov_crosslap(<a href="OggVorbis_File.html">OggVorbis_File</a> *old, <a href="OggVorbis_File.html">OggVorbis_File</a> *new);
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| 52 |
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| 53 | </b></pre>
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| 54 | </td>
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| 55 | </tr>
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| 56 | </table>
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| 57 |
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| 58 | <h3>Parameters</h3>
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| 59 | <dl>
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| 60 | <dt><i>old</i></dt>
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| 61 | <dd>A pointer to the OggVorbis_File structure representing the origin stream from which to transition playback.</dd>
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| 62 |
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| 63 | <dt><i>new</i></dt>
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| 64 | <dd>A pointer to the OggVorbis_File structure representing the stream with which playback continues.</dd>
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| 65 | </dl>
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| 66 |
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| 67 |
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| 68 | <h3>Return Values</h3>
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| 69 | <blockquote>
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| 70 | <dl>
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| 71 | <dt>OV_EINVAL</dt>
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| 72 | <dd>crosslap called with an OggVorbis_File structure that isn't open.</dd>
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| 73 | <dt>OV_EFAULT</dt>
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| 74 | <dd>internal error; implies a library bug or external heap corruption.</dd>
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| 75 | <dt>OV_EREAD</dt>
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| 76 | <dd> A read from media returned an error.</dd>
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| 77 | <dt>OV_EOF</dt>
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| 78 | <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>
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| 79 | <dt><i>0</i></dt>
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| 80 | <dd>success.</dd>
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| 81 | </dl>
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| 82 | </blockquote>
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| 83 |
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| 84 |
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| 85 |
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| 86 | <br><br>
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| 87 | <hr noshade>
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| 88 | <table border=0 width=100%>
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| 89 | <tr valign=top>
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| 90 | <td><p class=tiny>copyright © 2000-2010 Xiph.Org</p></td>
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| 91 | <td align=right><p class=tiny><a href="https://xiph.org/vorbis/">Ogg Vorbis</a></p></td>
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| 92 | </tr><tr>
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| 93 | <td><p class=tiny>Vorbisfile documentation</p></td>
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| 94 | <td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td>
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| 95 | </tr>
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| 96 | </table>
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| 97 |
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| 98 | </body>
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| 99 |
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| 100 | </html>
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