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| 3 | <head> |
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| 4 | <title>libvorbisenc - function - vorbis_encode_setup_vbr</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>libvorbisenc documentation</p></td> |
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| 12 | <td align=right><p class=tiny>libvorbisenc release 1.1 - 20040709</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>vorbis_encode_setup_vbr</h1> |
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| 17 | |
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| 18 | <p><i>declared in "vorbis/libvorbisenc.h";</i></p> |
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| 19 | |
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| 20 | <p>This function performs step-one of a three-step variable bitrate |
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| 21 | (quality-based) encode setup. It functions similarly to the one-step |
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| 22 | setup performed by <a |
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| 23 | href="vorbis_encode_init_vbr.html">vorbis_encode_init_vbr()</a> but |
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| 24 | allows an application to make further encode setup tweaks using <a |
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| 25 | href="vorbis_encode_ctl.html">vorbis_encode_ctl()</a> before finally |
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| 26 | calling <a |
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| 27 | href="vorbis_encode_setup_init.html">vorbis_encode_setup_init()</a> to |
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| 28 | complete the setup process. |
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| 29 | |
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| 30 | <p>Before this function is called, the <a href="vorbis_info.html">vorbis_info</a> struct should be initialized by using vorbis_info_init() from the libvorbis API. After encoding, vorbis_info_clear should be called. |
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| 31 | <p> |
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| 32 | <br><br> |
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| 33 | <table border=0 color=black cellspacing=0 cellpadding=7> |
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| 34 | <tr bgcolor=#cccccc> |
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| 35 | <td> |
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| 36 | <pre><b> |
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| 37 | extern int vorbis_encode_init_vbr(<a href="vorbis_info.html">vorbis_info</a> *vi, |
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| 38 | long channels, |
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| 39 | long rate, |
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| 40 | |
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| 41 | float base_quality); |
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| 42 | |
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| 43 | </b></pre> |
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| 44 | </td> |
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| 45 | </tr> |
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| 46 | </table> |
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| 47 | |
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| 48 | <h3>Parameters</h3> |
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| 49 | <dl> |
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| 50 | <dt><i>vi</i></dt> |
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| 51 | <dd>File pointer to an initialized <a href="vorbis_info.html">vorbis_info</a> struct.</dd> |
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| 52 | <dt><i>channels</i></dt> |
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| 53 | <dd>The number of channels to be encoded.</dd> |
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| 54 | <dt><i>rate</i></dt> |
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| 55 | <dd>The sampling rate of the source audio.</dd> |
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| 56 | <dt><i>base_quality</i></dt> |
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| 57 | <dd>Desired quality level, currently from -0.1 to 1.0 (lo to hi).</dd> |
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| 58 | </dl> |
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| 59 | |
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| 60 | |
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| 61 | <h3>Return Values</h3> |
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| 62 | <blockquote> |
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| 63 | <li> |
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| 64 | 0 for success</li> |
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| 65 | |
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| 66 | <li>less than zero for failure:</li> |
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| 67 | <ul> |
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| 68 | <li>OV_EFAULT - Internal logic fault; indicates a bug or heap/stack corruption.</li> |
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| 69 | <li>OV_EINVAL - Invalid setup request, eg, out of range argument. </li> |
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| 70 | <li>OV_EIMPL - Unimplemented mode; unable to comply with quality level request.</li> |
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| 71 | </ul> |
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| 72 | </blockquote> |
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| 73 | <p> |
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| 74 | |
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| 75 | <br><br> |
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| 76 | <hr noshade> |
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| 77 | <table border=0 width=100%> |
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| 78 | <tr valign=top> |
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| 79 | <td><p class=tiny>copyright © 2004 xiph.org</p></td> |
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| 80 | <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/index.html">Ogg Vorbis</a><br><a href="mailto:team@vorbis.org">team@vorbis.org</a></p></td> |
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| 81 | </tr><tr> |
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| 82 | <td><p class=tiny>libvorbisenc documentation</p></td> |
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| 83 | <td align=right><p class=tiny>libvorbisenc release 1.1 - 20040709</p></td> |
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| 84 | </tr> |
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| 85 | </table> |
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| 86 | |
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| 87 | |
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| 88 | </body> |
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| 89 | |
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| 90 | </html> |
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