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| <title>Vorbisfile - function - ov_pcm_seek_lap</title> |
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| <td><p class=tiny>Vorbisfile documentation</p></td> |
| <td align=right><p class=tiny>vorbisfile version 1.2.0 - 20070723</p></td> |
| </tr> |
| </table> |
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| <h1>ov_pcm_seek_lap</h1> |
| |
| <p><i>declared in "vorbis/vorbisfile.h";</i></p> |
| |
| <p>Seeks to the offset specified (in pcm samples) within the physical bitstream. This variant of <a |
| href="ov_pcm_seek.html">ov_pcm_seek</a> also automatically |
| crosslaps the transition from the previous playback position into the |
| new playback position in order to eliminate clicking and boundary |
| discontinuities. Otherwise, usage and behavior is identical to <a |
| href="ov_pcm_seek.html">ov_pcm_seek</a>. |
| |
| <p>ov_pcm_seek_lap also updates everything needed within the decoder, |
| so you can immediately call <a href="ov_read.html">ov_read()</a> and |
| get data from the newly seeked to position. |
| |
| <p>ov_pcm_seek_lap will lap between logical stream links of differing |
| numbers of channels. Any extra channels from the origin of the seek |
| are ignored; playback of these channels simply ends. Extra channels at |
| the destination are lapped from silence. ov_pcm_seek_lap will also |
| lap between logical stream 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. |
| |
| <p>This function only works for seekable streams. |
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| <br><br> |
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| <pre><b> |
| int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos); |
| </b></pre> |
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| <h3>Parameters</h3> |
| <dl> |
| <dt><i>vf</i></dt> |
| <dd>A pointer to the OggVorbis_File structure--this is used for ALL the externally visible libvorbisfile |
| functions.</dd> |
| <dt><i>pos</i></dt> |
| <dd>Position in pcm samples to seek to in the bitstream.</dd> |
| </dl> |
| |
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| <h3>Return Values</h3> |
| <blockquote> |
| <ul> |
| <li>0 for success</li> |
| |
| <li> |
| nonzero indicates failure, described by several error codes: |
| <ul> |
| <li>OV_ENOSEEK - Bitstream is not seekable. |
| </li> |
| <li>OV_EINVAL - Invalid argument value; possibly called with an OggVorbis_File structure that isn't open. |
| </li> |
| <li>OV_EREAD - A read from media returned an error. |
| </li> |
| <li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack |
| corruption. |
| </li> |
| <li>OV_EOF - Indicates stream is at end of file immediately after a seek |
| (making crosslap impossible as there's no preceeding decode state to crosslap). |
| </li> |
| <li>OV_EBADLINK - Invalid stream section supplied to libvorbisfile, or the requested link is corrupt. |
| </li> |
| </ul></li> |
| </ul></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> |
| |
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