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1 <html>
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3 <head>
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4 <title>Vorbisfile - function - ov_raw_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_raw_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 compressed raw bytes) within the
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21 physical bitstream. This variant of <a
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22 href="ov_raw_seek.html">ov_raw_seek</a> also automatically crosslaps
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23 the transition from the previous playback position into the new
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24 playback position in order to eliminate clicking and boundary
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25 discontinuities. Otherwise, usage and behavior is identical to <a
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26 href="ov_raw_seek.html">ov_raw_seek</a>.
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27
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28 <p>When seek speed is a priority, but crosslapping is still desired,
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29 this is the best seek funtion to use.
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30
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31 <p>ov_raw_seek_lap also updates everything needed within the decoder,
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32 so you can immediately call <a href="ov_read.html">ov_read()</a> and
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33 get data from the newly seeked to position.
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34
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35 <p>ov_raw_seek_lap will lap between logical stream links of differing
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36 numbers of channels. Any extra channels from the origin of the seek
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37 are ignored; playback of these channels simply ends. Extra channels at
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38 the destination are lapped from silence. ov_raw_seek_lap will also
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39 lap between logical stream links of differing sample rates. In this
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40 case, the sample rates are ignored (no implicit resampling is done to
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41 match playback). It is up to the application developer to decide if
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42 this behavior makes any sense in a given context; in practical use,
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43 these default behaviors perform sensibly.
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44
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45 <p>This function only works for seekable streams.
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46
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47
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48 <br><br>
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49 <table border=0 color=black cellspacing=0 cellpadding=7>
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50 <tr bgcolor=#cccccc>
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51 <td>
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52 <pre><b>
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53 int ov_raw_seek_lap(OggVorbis_File *vf,long pos);
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54 </b></pre>
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55 </td>
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56 </tr>
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57 </table>
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58
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59 <h3>Parameters</h3>
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60 <dl>
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61 <dt><i>vf</i></dt>
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62 <dd>A pointer to the OggVorbis_File structure--this is used for ALL the externally visible libvorbisfile
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63 functions.</dd>
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64 <dt><i>pos</i></dt>
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65 <dd>Position in compressed bytes to seek to in the bitstream.</dd>
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66 </dl>
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67
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68
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69 <h3>Return Values</h3>
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70 <blockquote>
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71 <ul>
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72 <li>0 for success</li>
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73
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74 <li>
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75 nonzero indicates failure, described by several error codes:
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76 <ul>
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77 <li>OV_ENOSEEK - Bitstream is not seekable.
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78 </li>
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79 <li>OV_EINVAL - Invalid argument value; possibly called with an OggVorbis_File structure that isn't open.
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80 </li>
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81 <li>OV_EREAD - A read from media returned an error.
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82 </li>
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83 <li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack
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84 corruption.
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85 </li>
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86 <li>OV_EOF - Indicates stream is at end of file immediately after a seek
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87 (making crosslap impossible as there's no preceeding decode state to crosslap).
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88 </li>
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89 <li>OV_EBADLINK - Invalid stream section supplied to libvorbisfile, or the requested link is corrupt.
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90 </li>
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91 </ul></li>
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92 </ul></blockquote>
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93
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94 <p>
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95
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96 <br><br>
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97 <hr noshade>
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98 <table border=0 width=100%>
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99 <tr valign=top>
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100 <td><p class=tiny>copyright © 2000-2010 Xiph.Org</p></td>
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101 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a></p></td>
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102 </tr><tr>
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103 <td><p class=tiny>Vorbisfile documentation</p></td>
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104 <td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td>
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105 </tr>
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106 </table>
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107
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108 </body>
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109
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110 </html>
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