ogg/doc/libogg/ogg_stream_packetpeek.html

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   4 <title>libogg - function - ogg_stream_packetpeek</title>
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  11 <td><p class=tiny>libogg documentation</p></td>
  12 <td align=right><p class=tiny>libogg release 1.3.3 - 20171107</p></td>
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  15
  16 <h1>ogg_stream_packetpeek</h1>
  17
  18 <p><i>declared in "ogg/ogg.h";</i></p>
  19
  20 <p>This function attempts to assemble a raw data packet and returns
  21 it without advancing decoding.</p>
  22
  23 <p>In a typical situation, this would be called
  24 speculatively after <a
  25 href="ogg_stream_pagein.html">ogg_stream_pagein()</a> to check
  26 the packet contents before handing it off to a codec for
  27 decompression. To advance page decoding and remove
  28 the packet from the sync structure, call
  29 <a href="ogg_stream_packetout.html">ogg_stream_packetout()</a>.</p>
  30
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  36 <pre><b>
  37 int ogg_stream_packetpeek(ogg_stream_state *os,ogg_packet *op);
  38 </b></pre>
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  42
  43 <h3>Parameters</h3>
  44 <dl>
  45 <dt><i>os</i></dt>
  46 <dd>Pointer to a previously declared
  47 <a href="ogg_stream_state.html">ogg_stream_state</a> struct.  Before this
  48 function is called, an <a href="ogg_page.html">ogg_page</a> should be
  49 submitted to the stream using
  50 <a href="ogg_stream_pagein.html">ogg_stream_pagein()</a>.</dd>
  51 <dt><i>op</i></dt>
  52 <dd>Pointer to the next packet available in the bitstream, if
  53 any. A NULL value may be passed in the case of a simple "is there a
  54 packet?" check.</dd>
  55 </dl>
  56
  57
  58 <h3>Return Values</h3>
  59 <blockquote>
  60 <ul>
  61 <li>-1 if there's no packet available due to lost sync or a hole in the data.</li>
  62 <li>0 if there is insufficient data available to complete a packet, or on unrecoverable internal error occurred.</li>
  63 <li>1 if a packet is available.</li>
  64 </ul>
  65 </blockquote>
  66
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  74 <td><p class=tiny>copyright &copy; 2000-2017 Xiph.Org Foundation</p></td>
  75 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/">Ogg Container Format</a></p></td>
  76 </tr><tr>
  77 <td><p class=tiny>libogg documentation</p></td>
  78 <td align=right><p class=tiny>libogg release 1.3.3 - 20171107</p></td>
  79 </tr>
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