ogg/doc/libogg/ogg_stream_state.html

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   4 <title>libogg - datatype - ogg_stream_state</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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  14 </table>
  15
  16 <h1>ogg_stream_state</h1>
  17
  18 <p><i>declared in "ogg/ogg.h"</i></p>
  19
  20 <p>
  21 The ogg_stream_state struct tracks the current encode/decode state of the current logical bitstream.
  22 <p>
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  27 <pre><b>
  28 typedef struct {
  29   unsigned char   *body_data;    /* bytes from packet bodies */
  30   long    body_storage;          /* storage elements allocated */
  31   long    body_fill;             /* elements stored; fill mark */
  32   long    body_returned;         /* elements of fill returned */
  33
  34
  35   int     *lacing_vals;    /* The values that will go to the segment table */
  36   ogg_int64_t *granule_vals;      /* granulepos values for headers. Not compact
  37                              this way, but it is simple coupled to the
  38                              lacing fifo */
  39   long    lacing_storage;
  40   long    lacing_fill;
  41   long    lacing_packet;
  42   long    lacing_returned;
  43
  44   unsigned char    header[282];      /* working space for header encode */
  45   int              header_fill;
  46
  47   int     e_o_s;          /* set when we have buffered the last packet in the
  48                              logical bitstream */
  49   int     b_o_s;          /* set after we've written the initial page
  50                              of a logical bitstream */
  51   long     serialno;
  52   int      pageno;
  53   ogg_int64_t  packetno;      /* sequence number for decode; the framing
  54                              knows where there's a hole in the data,
  55                              but we need coupling so that the codec
  56                              (which is in a seperate abstraction
  57                              layer) also knows about the gap */
  58   ogg_int64_t   granulepos;
  59
  60 } ogg_stream_state;
  61 </b></pre>
  62         </td>
  63 </tr>
  64 </table>
  65
  66 <h3>Relevant Struct Members</h3>
  67 <dl>
  68 <dt><i>body_data</i></dt>
  69 <dd>Pointer to data from packet bodies.</dd>
  70 <dt><i>body_storage</i></dt>
  71 <dd>Storage allocated for bodies in bytes (filled or unfilled).</dd>
  72 <dt><i>body_fill</i></dt>
  73 <dd>Amount of storage filled with stored packet bodies.</dd>
  74 <dt><i>body_returned</i></dt>
  75 <dd>Number of elements returned from storage.</dd>
  76 <dt><i>lacing_vals</i></dt>
  77 <dd>String of lacing values for the packet segments within the current page.  Each value is a byte, indicating packet segment length.</dd>
  78 <dt><i>granule_vals</i></dt>
  79 <dd>Pointer to the lacing values for the packet segments within the current page.</dd>
  80 <dt><i>lacing_storage</i></dt>
  81 <dd>Total amount of storage (in bytes) allocated for storing lacing values.</dd>
  82 <dt><i>lacing_fill</i></dt>
  83 <dd>Fill marker for the current vs. total allocated storage of lacing values for the page.</dd>
  84 <dt><i>lacing_packet</i></dt>
  85 <dd>Lacing value for current packet segment.</dd>
  86 <dt><i>lacing_returned</i></dt>
  87 <dd>Number of lacing values returned from lacing_storage.</dd>
  88 <dt><i>header</i></dt>
  89 <dd>Temporary storage for page header during encode process, while the header is being created.</dd>
  90 <dt><i>header_fill</i></dt>
  91 <dd>Fill marker for header storage allocation.  Used during the header creation process.</dd>
  92 <dt><i>e_o_s</i></dt>
  93 <dd>Marker set when the last packet of the logical bitstream has been buffered.</dd>
  94 <dt><i>b_o_s</i></dt>
  95 <dd>Marker set after we have written the first page in the logical bitstream.</dd>
  96 <dt><i>serialno</i></dt>
  97 <dd>Serial number of this logical bitstream.</dd>
  98 <dt><i>pageno</i></dt>
  99 <dd>Number of the current page within the stream.</dd>
 100 <dt><i>packetno</i></dt>
 101 <dd>Number of the current packet.</dd>
 102 <dt><i>granulepos</i></dt>
 103 <dd>Exact position of decoding/encoding process.</dd>
 104 </dl>
 105
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 111 <td><p class=tiny>copyright &copy; 2000-2017 Xiph.Org Foundation</p></td>
 112 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/">Ogg Container Format</a></p></td>
 113 </tr><tr>
 114 <td><p class=tiny>libogg documentation</p></td>
 115 <td align=right><p class=tiny>libogg release 1.3.3 - 20171107</p></td>
 116 </tr>
 117 </table>
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