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00002
00003 <head>
00004 <title>Vorbisfile - function - ov_time_seek_page_lap</title>
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00006 </head>
00007
00008 <body bgcolor=white text=black link="#5555ff" alink="#5555ff" vlink="#5555ff">
00009 <table border=0 width=100%>
00010 <tr>
00011 <td><p class=tiny>Vorbisfile documentation</p></td>
00012 <td align=right><p class=tiny>vorbisfile version 1.68 - 20030307</p></td>
00013 </tr>
00014 </table>
00015
00016 <h1>ov_time_seek_page_lap</h1>
00017
00018 <p><i>declared in "vorbis/vorbisfile.h";</i></p>
00019
00020 <p>For seekable streams, ov_time_seek_page_lap seeks to the closest
00021 full page preceeding the given time. This variant of <a
00022 href="ov_time_seek_page.html">ov_time_seek_page</a> also automatically
00023 crosslaps the transition from the previous playback position into the
00024 new playback position in order to eliminate clicking and boundary
00025 discontinuities. Otherwise, usage and behavior is identical to <a
00026 href="ov_time_seek_page.html">ov_time_seek_page</a>.
00027
00028 <p>ov_time_seek_page_lap is faster than <a
00029 href="ov_time_seek_lap.html">ov_time_seek_lap</a> because it doesn't
00030 seek through the last few samples to reach an exact time, but it is
00031 also less accurate. This should be used when speed is important, but
00032 crosslapping is still desired.
00033
00034 <p>ov_time_seek_page_lap also updates everything needed within the
00035 decoder, so you can immediately call <a
00036 href="ov_read.html">ov_read()</a> and get data from the newly seeked
00037 to position.
00038
00039 <p>ov_time_seek_page_lap will lap between logical stream links of
00040 differing numbers of channels. Any extra channels from the origin of
00041 the seek are ignored; playback of these channels simply ends. Extra
00042 channels at the destination are lapped from silence.
00043 ov_time_seek_page_lap will also lap between logical stream links of
00044 differing sample rates. In this case, the sample rates are ignored
00045 (no implicit resampling is done to match playback). It is up to the
00046 application developer to decide if this behavior makes any sense in a
00047 given context; in practical use, these default behaviors perform
00048 sensibly.
00049
00050 <p>This function does not work for unseekable streams.
00051
00052 <br><br>
00053 <table border=0 color=black cellspacing=0 cellpadding=7>
00054 <tr bgcolor=#cccccc>
00055 <td>
00056 <pre><b>
00057 int ov_time_seek_page_lap(<a href="OggVorbis_File.html">OggVorbis_File</a> *vf, double s);
00058 </b></pre>
00059 </td>
00060 </tr>
00061 </table>
00062
00063 <h3>Parameters</h3>
00064 <dl>
00065 <dt><i>vf</i></dt>
00066 <dd>Pointer to our already opened and initialized OggVorbis_File structure.</dd>
00067 <dt><i>ms</i></dt>
00068 <dd>Location to seek to within the file, specified in seconds.</dd>
00069 </dl>
00070
00071
00072 <h3>Return Values</h3>
00073 <blockquote>
00074 <ul>
00075 <li>0 for success</li>
00076
00077 <li>
00078 nonzero indicates failure, described by several error codes:
00079 <ul>
00080 <li>OV_ENOSEEK - Bitstream is not seekable.
00081 </li>
00082 <li>OV_EINVAL - Invalid argument value; possibly called with an OggVorbis_File structure that isn't open.
00083 </li>
00084 <li>OV_EREAD - A read from media returned an error.
00085 </li>
00086 <li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack
00087 corruption.
00088 </li>
00089 <li>OV_EOF - Indicates stream is at end of file immediately after a seek
00090 (making crosslap impossible as there's no preceeding decode state to crosslap).
00091 </li>
00092 <li>OV_EBADLINK - Invalid stream section supplied to libvorbisfile, or the requested link is corrupt.
00093 </li>
00094 </ul></li>
00095 </ul></blockquote>
00096
00097
00098 <br><br>
00099 <hr noshade>
00100 <table border=0 width=100%>
00101 <tr valign=top>
00102 <td><p class=tiny>copyright © 2003 Xiph.org</p></td>
00103 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a></p></td>
00104 </tr><tr>
00105 <td><p class=tiny>Vorbisfile documentation</p></td>
00106 <td align=right><p class=tiny>vorbisfile version 1.68 - 20030307</p></td>
00107 </tr>
00108 </table>
00109
00110 </body>
00111
00112 </html>
