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3 <head>
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4 <title>libvorbis - function - vorbis_analysis_buffer</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>libvorbis documentation</p></td>
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12 <td align=right><p class=tiny>libvorbis 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>vorbis_analysis_buffer</h1>
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17
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18 <p><i>declared in "vorbis/codec.h";</i></p>
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19
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20 <p>This fuction requests a buffer array for delivering audio to the
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21 encoder for compression.</p>
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22
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23 <p>The Vorbis encoder expects the caller to write audio data as
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24 non-interleaved floating point samples into its internal buffers.
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25 </p>
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26 <p>
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27 The general procedure is to call this function with the number of samples
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28 you have available. The encoder will arrange for that much internal storage
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29 and return an array of buffer pointers, one for each channel of audio.
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30 The caller must then write the audio samples into those buffers, as
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31 float values, and finally call vorbis_analysis_wrote() to tell the
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32 encoder the data is available for analysis.
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33 </p>
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34
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35 <table border=0 color=black cellspacing=0 cellpadding=7>
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36 <tr bgcolor=#cccccc>
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37 <td>
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38 <pre><b>
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39 extern float **vorbis_analysis_buffer(vorbis_dsp_state *v,int vals);
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40 </b></pre>
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41 </td>
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42 </tr>
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43 </table>
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44
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45 <h3>Parameters</h3>
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46 <dl>
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47 <dt><i>v</i></dt>
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48 <dd>Pointer to the vorbis_dsp_state representing the encoder.</dd>
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49 <dt><i>vals</i></dt>
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50 <dd>Number of samples to provide space for in the returned buffer. 1024 is a reasonable choice.</dd>
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51 </dl>
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52
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53
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54 <h3>Return Values</h3>
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55 <p>Returns an array of floating point buffers which can accept data.
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56 A (**float) where the first index is the channel, and the second is
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57 the sample index.<p>
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58
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59 <br><br>
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60 <hr noshade>
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61 <table border=0 width=100%>
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62 <tr valign=top>
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63 <td><p class=tiny>copyright © 2010 Xiph.Org</p></td>
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64 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/index.html">Ogg Vorbis</a></p></td>
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65 </tr><tr>
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66 <td><p class=tiny>libvorbis documentation</p></td>
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67 <td align=right><p class=tiny>libvorbis version 1.3.2 - 20101101</p></td>
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68 </tr>
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69 </table>
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70
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71
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72 </body>
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73
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74 </html>
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