f</em>&nbsp;</td><td>int: The maximum post-processing level. </td></tr>
  </table>
  </dd>
</dl>
<dl><dt><b>Return values:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>TH_EFAULT</em>&nbsp;</td><td><em>_dec_ctx</em> or <em>_buf</em> is <code>NULL</code>. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>TH_EINVAL</em>&nbsp;</td><td><em>_buf_sz</em> is not <code>sizeof(int)</code>. </td></tr>
    <tr><td valign="top"></td><td 