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1 <html>
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2
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3 <head>
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4 <title>Vorbisfile - function - ov_pcm_seek_lap</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_pcm_seek_lap</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>Seeks to the offset specified (in pcm samples) within the physical bitstream. This variant of <a
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21 href="ov_pcm_seek.html">ov_pcm_seek</a> also automatically
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22 crosslaps the transition from the previous playback position into the
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23 new playback position in order to eliminate clicking and boundary
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24 discontinuities. Otherwise, usage and behavior is identical to <a
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25 href="ov_pcm_seek.html">ov_pcm_seek</a>.
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26
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27 <p>ov_pcm_seek_lap also updates everything needed within the decoder,
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28 so you can immediately call <a href="ov_read.html">ov_read()</a> and
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29 get data from the newly seeked to position.
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30
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31 <p>ov_pcm_seek_lap will lap between logical stream links of differing
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32 numbers of channels. Any extra channels from the origin of the seek
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33 are ignored; playback of these channels simply ends. Extra channels at
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34 the destination are lapped from silence. ov_pcm_seek_lap will also
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35 lap between logical stream links of differing sample rates. In this
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36 case, the sample rates are ignored (no implicit resampling is done to
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37 match playback). It is up to the application developer to decide if
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38 this behavior makes any sense in a given context; in practical use,
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39 these default behaviors perform sensibly.
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40
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41 <p>This function only works for seekable streams.
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42
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43 <br><br>
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44 <table border=0 color=black cellspacing=0 cellpadding=7>
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45 <tr bgcolor=#cccccc>
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46 <td>
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47 <pre><b>
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48 int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
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49 </b></pre>
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50 </td>
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51 </tr>
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52 </table>
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53
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54 <h3>Parameters</h3>
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55 <dl>
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56 <dt><i>vf</i></dt>
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57 <dd>A pointer to the OggVorbis_File structure--this is used for ALL the externally visible libvorbisfile
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58 functions.</dd>
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59 <dt><i>pos</i></dt>
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60 <dd>Position in pcm samples to seek to in the bitstream.</dd>
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61 </dl>
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62
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63
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64 <h3>Return Values</h3>
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65 <blockquote>
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66 <ul>
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67 <li>0 for success</li>
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68
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69 <li>
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70 nonzero indicates failure, described by several error codes:
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71 <ul>
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72 <li>OV_ENOSEEK - Bitstream is not seekable.
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73 </li>
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74 <li>OV_EINVAL - Invalid argument value; possibly called with an OggVorbis_File structure that isn't open.
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75 </li>
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76 <li>OV_EREAD - A read from media returned an error.
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77 </li>
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78 <li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack
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79 corruption.
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80 </li>
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81 <li>OV_EOF - Indicates stream is at end of file immediately after a seek
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82 (making crosslap impossible as there's no preceeding decode state to crosslap).
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83 </li>
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84 <li>OV_EBADLINK - Invalid stream section supplied to libvorbisfile, or the requested link is corrupt.
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85 </li>
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86 </ul></li>
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87 </ul></blockquote>
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88
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89 <br><br>
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90 <hr noshade>
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91 <table border=0 width=100%>
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92 <tr valign=top>
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93 <td><p class=tiny>copyright © 2000-2010 Xiph.Org</p></td>
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94 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a></p></td>
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95 </tr><tr>
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96 <td><p class=tiny>Vorbisfile documentation</p></td>
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97 <td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td>
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98 </tr>
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99 </table>
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100
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101 </body>
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102
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103 </html>
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