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<title>libogg - datatype - ogg_stream_state</title>
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<td><p class=tiny>libogg documentation</p></td>
<td align=right><p class=tiny>libogg release 1.3.0 - 20110804</p></td>
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<h1>ogg_stream_state</h1>

<p><i>declared in "ogg/ogg.h"</i></p>

<p>
The ogg_stream_state struct tracks the current encode/decode state of the current logical bitstream.
<p>

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<pre><b>
typedef struct {
  unsigned char   *body_data;    /* bytes from packet bodies */
  long    body_storage;          /* storage elements allocated */
  long    body_fill;             /* elements stored; fill mark */
  long    body_returned;         /* elements of fill returned */


  int     *lacing_vals;    /* The values that will go to the segment table */
  ogg_int64_t *granule_vals;      /* granulepos values for headers. Not compact
                             this way, but it is simple coupled to the
                             lacing fifo */
  long    lacing_storage;
  long    lacing_fill;
  long    lacing_packet;
  long    lacing_returned;

  unsigned char    header[282];      /* working space for header encode */
  int              header_fill;

  int     e_o_s;          /* set when we have buffered the last packet in the
                             logical bitstream */
  int     b_o_s;          /* set after we've written the initial page
                             of a logical bitstream */
  long     serialno;
  int      pageno;
  ogg_int64_t  packetno;      /* sequence number for decode; the framing
                             knows where there's a hole in the data,
                             but we need coupling so that the codec
                             (which is in a seperate abstraction
                             layer) also knows about the gap */
  ogg_int64_t   granulepos;

} ogg_stream_state;
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<h3>Relevant Struct Members</h3>
<dl>
<dt><i>body_data</i></dt>
<dd>Pointer to data from packet bodies.</dd>
<dt><i>body_storage</i></dt>
<dd>Storage allocated for bodies in bytes (filled or unfilled).</dd>
<dt><i>body_fill</i></dt>
<dd>Amount of storage filled with stored packet bodies.</dd>
<dt><i>body_returned</i></dt>
<dd>Number of elements returned from storage.</dd>
<dt><i>lacing_vals</i></dt>
<dd>String of lacing values for the packet segments within the current page.  Each value is a byte, indicating packet segment length.</dd>
<dt><i>granule_vals</i></dt>
<dd>Pointer to the lacing values for the packet segments within the current page.</dd>
<dt><i>lacing_storage</i></dt>
<dd>Total amount of storage (in bytes) allocated for storing lacing values.</dd>
<dt><i>lacing_fill</i></dt>
<dd>Fill marker for the current vs. total allocated storage of lacing values for the page.</dd>
<dt><i>lacing_packet</i></dt>
<dd>Lacing value for current packet segment.</dd>
<dt><i>lacing_returned</i></dt>
<dd>Number of lacing values returned from lacing_storage.</dd>
<dt><i>header</i></dt>
<dd>Temporary storage for page header during encode process, while the header is being created.</dd>
<dt><i>header_fill</i></dt>
<dd>Fill marker for header storage allocation.  Used during the header creation process.</dd>
<dt><i>e_o_s</i></dt>
<dd>Marker set when the last packet of the logical bitstream has been buffered.</dd>
<dt><i>b_o_s</i></dt>
<dd>Marker set after we have written the first page in the logical bitstream.</dd>
<dt><i>serialno</i></dt>
<dd>Serial number of this logical bitstream.</dd>
<dt><i>pageno</i></dt>
<dd>Number of the current page within the stream.</dd>
<dt><i>packetno</i></dt>
<dd>Number of the current packet.</dd>
<dt><i>granulepos</i></dt>
<dd>Exact position of decoding/encoding process.</dd>
</dl>


<br><br>
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<td><p class=tiny>copyright &copy; 2000-2011 Xiph.Org</p></td>
<td align=right><p class=tiny><a href="http://www.xiph.org/ogg/">Ogg Container Format</a></p></td>
</tr><tr>
<td><p class=tiny>libogg documentation</p></td>
<td align=right><p class=tiny>libogg release 1.3.0 - 20110804</p></td>
</tr>
</table>

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author	Chris Cannam
date	Fri, 07 Feb 2020 11:51:13 +0000
parents	05aa0afa9217
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