| [15] | 1 | <html> |
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| 2 | |
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| 3 | <head> |
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| 4 | <title>libogg - datatype - ogg_stream_state</title> |
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| 5 | <link rel=stylesheet href="style.css" type="text/css"> |
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| 6 | </head> |
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| 7 | |
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| 8 | <body bgcolor=white text=black link="#5555ff" alink="#5555ff" vlink="#5555ff"> |
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| 9 | <table border=0 width=100%> |
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| 10 | <tr> |
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| 11 | <td><p class=tiny>libogg documentation</p></td> |
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| 12 | <td align=right><p class=tiny>libogg release 1.0 - 20000615</p></td> |
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| 13 | </tr> |
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| 14 | </table> |
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| 15 | |
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| 16 | <h1>ogg_stream_state</h1> |
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| 17 | |
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| 18 | <p><i>declared in "ogg/ogg.h"</i></p> |
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| 19 | |
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| 20 | <p> |
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| 21 | The ogg_stream_state struct tracks the current encode/decode state of the current logical bitstream. |
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| 22 | <p> |
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| 23 | |
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| 24 | <table border=0 width=100% color=black cellspacing=0 cellpadding=7> |
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| 25 | <tr bgcolor=#cccccc> |
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| 26 | <td> |
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| 27 | <pre><b> |
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| 28 | typedef struct { |
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| 29 | unsigned char *body_data; /* bytes from packet bodies */ |
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| 30 | long body_storage; /* storage elements allocated */ |
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| 31 | long body_fill; /* elements stored; fill mark */ |
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| 32 | long body_returned; /* elements of fill returned */ |
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| 33 | |
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| 34 | |
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| 35 | int *lacing_vals; /* The values that will go to the segment table */ |
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| 36 | ogg_int64_t *granule_vals; /* granulepos values for headers. Not compact |
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| 37 | this way, but it is simple coupled to the |
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| 38 | lacing fifo */ |
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| 39 | long lacing_storage; |
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| 40 | long lacing_fill; |
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| 41 | long lacing_packet; |
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| 42 | long lacing_returned; |
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| 43 | |
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| 44 | unsigned char header[282]; /* working space for header encode */ |
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| 45 | int header_fill; |
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| 46 | |
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| 47 | int e_o_s; /* set when we have buffered the last packet in the |
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| 48 | logical bitstream */ |
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| 49 | int b_o_s; /* set after we've written the initial page |
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| 50 | of a logical bitstream */ |
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| 51 | long serialno; |
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| 52 | int pageno; |
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| 53 | ogg_int64_t packetno; /* sequence number for decode; the framing |
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| 54 | knows where there's a hole in the data, |
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| 55 | but we need coupling so that the codec |
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| 56 | (which is in a seperate abstraction |
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| 57 | layer) also knows about the gap */ |
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| 58 | ogg_int64_t granulepos; |
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| 59 | |
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| 60 | } ogg_stream_state; |
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| 61 | </b></pre> |
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| 62 | </td> |
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| 63 | </tr> |
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| 64 | </table> |
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| 65 | |
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| 66 | <h3>Relevant Struct Members</h3> |
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| 67 | <dl> |
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| 68 | <dt><i>body_data</i></dt> |
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| 69 | <dd>Pointer to data from packet bodies.</dd> |
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| 70 | <dt><i>body_storage</i></dt> |
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| 71 | <dd>Storage allocated for bodies in bytes (filled or unfilled).</dd> |
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| 72 | <dt><i>body_fill</i></dt> |
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| 73 | <dd>Amount of storage filled with stored packet bodies.</dd> |
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| 74 | <dt><i>body_returned</i></dt> |
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| 75 | <dd>Number of elements returned from storage.</dd> |
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| 76 | <dt><i>lacing_vals</i></dt> |
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| 77 | <dd>String of lacing values for the packet segments within the current page. Each value is a byte, indicating packet segment length.</dd> |
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| 78 | <dt><i>granule_vals</i></dt> |
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| 79 | <dd>Pointer to the lacing values for the packet segments within the current page.</dd> |
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| 80 | <dt><i>lacing_storage</i></dt> |
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| 81 | <dd>Total amount of storage (in bytes) allocated for storing lacing values.</dd> |
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| 82 | <dt><i>lacing_fill</i></dt> |
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| 83 | <dd>Fill marker for the current vs. total allocated storage of lacing values for the page.</dd> |
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| 84 | <dt><i>lacing_packet</i></dt> |
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| 85 | <dd>Lacing value for current packet segment.</dd> |
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| 86 | <dt><i>lacing_returned</i></dt> |
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| 87 | <dd>Number of lacing values returned from lacing_storage.</dd> |
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| 88 | <dt><i>header</i></dt> |
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| 89 | <dd>Temporary storage for page header during encode process, while the header is being created.</dd> |
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| 90 | <dt><i>header_fill</i></dt> |
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| 91 | <dd>Fill marker for header storage allocation. Used during the header creation process.</dd> |
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| 92 | <dt><i>e_o_s</i></dt> |
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| 93 | <dd>Marker set when the last packet of the logical bitstream has been buffered.</dd> |
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| 94 | <dt><i>b_o_s</i></dt> |
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| 95 | <dd>Marker set after we have written the first page in the logical bitstream.</dd> |
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| 96 | <dt><i>serialno</i></dt> |
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| 97 | <dd>Serial number of this logical bitstream.</dd> |
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| 98 | <dt><i>pageno</i></dt> |
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| 99 | <dd>Number of the current page within the stream.</dd> |
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| 100 | <dt><i>packetno</i></dt> |
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| 101 | <dd>Number of the current packet.</dd> |
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| 102 | <dt><i>granulepos</i></dt> |
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| 103 | <dd>Exact position of decoding/encoding process.</dd> |
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| 104 | </dl> |
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| 105 | |
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| 106 | |
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| 107 | <br><br> |
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| 108 | <hr noshade> |
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| 109 | <table border=0 width=100%> |
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| 110 | <tr valign=top> |
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| 111 | <td><p class=tiny>copyright © 2000 xiph.org</p></td> |
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| 112 | <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/index.html">Ogg Vorbis</a><br><a href="mailto:team@xiph.org">team@xiph.org</a></p></td> |
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| 113 | </tr><tr> |
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| 114 | <td><p class=tiny>libogg documentation</p></td> |
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| 115 | <td align=right><p class=tiny>libogg release 1.0 - 20000615</p></td> |
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| 116 | </tr> |
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| 117 | </table> |
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| 118 | |
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| 119 | </body> |
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| 120 | |
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| 121 | </html> |
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