cket of any logical stream to determine if that stream is a Theora stream. </p>
<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>_info</em>&nbsp;</td><td>A <a class="el" href="structth__info.html" title="Theora bitstream information.">th_info</a> structure to fill in. This must have been previously initialized with <a class="el" href="group__basefuncs.html#ga430d9c605816a6ca0bdce3a0b965b926" title="Initializes a th_in