tremor/ogg.h

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002             *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: toplevel libogg include
  14  last mod: $Id$
  15
  16  ********************************************************************/
  17 #ifndef _OGG_H
  18 #define _OGG_H
  19
  20 #ifdef __cplusplus
  21 extern "C" {
  22 #endif
  23
  24 #include "os_types.h"
  25
  26 typedef struct {
  27   long endbyte;
  28   int  endbit;
  29
  30   unsigned char *buffer;
  31   unsigned char *ptr;
  32   long storage;
  33 } oggpack_buffer;
  34
  35 /* ogg_page is used to encapsulate the data in one Ogg bitstream page *****/
  36
  37 typedef struct {
  38   unsigned char *header;
  39   long header_len;
  40   unsigned char *body;
  41   long body_len;
  42 } ogg_page;
  43
  44 /* ogg_stream_state contains the current encode/decode state of a logical
  45    Ogg bitstream **********************************************************/
  46
  47 typedef struct {
  48   unsigned char   *body_data;    /* bytes from packet bodies */
  49   long    body_storage;          /* storage elements allocated */
  50   long    body_fill;             /* elements stored; fill mark */
  51   long    body_returned;         /* elements of fill returned */
  52
  53
  54   int     *lacing_vals;      /* The values that will go to the segment table */
  55   ogg_int64_t *granule_vals; /* granulepos values for headers. Not compact
  56                                 this way, but it is simple coupled to the
  57                                 lacing fifo */
  58   long    lacing_storage;
  59   long    lacing_fill;
  60   long    lacing_packet;
  61   long    lacing_returned;
  62
  63   unsigned char    header[282];      /* working space for header encode */
  64   int              header_fill;
  65
  66   int     e_o_s;          /* set when we have buffered the last packet in the
  67                              logical bitstream */
  68   int     b_o_s;          /* set after we've written the initial page
  69                              of a logical bitstream */
  70   long    serialno;
  71   long    pageno;
  72   ogg_int64_t  packetno;      /* sequence number for decode; the framing
  73                              knows where there's a hole in the data,
  74                              but we need coupling so that the codec
  75                              (which is in a seperate abstraction
  76                              layer) also knows about the gap */
  77   ogg_int64_t   granulepos;
  78
  79 } ogg_stream_state;
  80
  81 /* ogg_packet is used to encapsulate the data and metadata belonging
  82    to a single raw Ogg/Vorbis packet *************************************/
  83
  84 typedef struct {
  85   unsigned char *packet;
  86   long  bytes;
  87   long  b_o_s;
  88   long  e_o_s;
  89
  90   ogg_int64_t  granulepos;
  91
  92   ogg_int64_t  packetno;     /* sequence number for decode; the framing
  93                                 knows where there's a hole in the data,
  94                                 but we need coupling so that the codec
  95                                 (which is in a seperate abstraction
  96                                 layer) also knows about the gap */
  97 } ogg_packet;
  98
  99 typedef struct {
 100   unsigned char *data;
 101   int storage;
 102   int fill;
 103   int returned;
 104
 105   int unsynced;
 106   int headerbytes;
 107   int bodybytes;
 108 } ogg_sync_state;
 109
 110 /* Ogg BITSTREAM PRIMITIVES: bitstream ************************/
 111
 112 extern void  oggpack_writeinit(oggpack_buffer *b);
 113 extern void  oggpack_writetrunc(oggpack_buffer *b,long bits);
 114 extern void  oggpack_writealign(oggpack_buffer *b);
 115 extern void  oggpack_writecopy(oggpack_buffer *b,void *source,long bits);
 116 extern void  oggpack_reset(oggpack_buffer *b);
 117 extern void  oggpack_writeclear(oggpack_buffer *b);
 118 extern void  oggpack_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
 119 extern void  oggpack_write(oggpack_buffer *b,unsigned long value,int bits);
 120 extern long  oggpack_look(oggpack_buffer *b,int bits);
 121 extern long  oggpack_look1(oggpack_buffer *b);
 122 extern void  oggpack_adv(oggpack_buffer *b,int bits);
 123 extern void  oggpack_adv1(oggpack_buffer *b);
 124 extern long  oggpack_read(oggpack_buffer *b,int bits);
 125 extern long  oggpack_read1(oggpack_buffer *b);
 126 extern long  oggpack_bytes(oggpack_buffer *b);
 127 extern long  oggpack_bits(oggpack_buffer *b);
 128 extern unsigned char *oggpack_get_buffer(oggpack_buffer *b);
 129
 130 extern void  oggpackB_writeinit(oggpack_buffer *b);
 131 extern void  oggpackB_writetrunc(oggpack_buffer *b,long bits);
 132 extern void  oggpackB_writealign(oggpack_buffer *b);
 133 extern void  oggpackB_writecopy(oggpack_buffer *b,void *source,long bits);
 134 extern void  oggpackB_reset(oggpack_buffer *b);
 135 extern void  oggpackB_writeclear(oggpack_buffer *b);
 136 extern void  oggpackB_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
 137 extern void  oggpackB_write(oggpack_buffer *b,unsigned long value,int bits);
 138 extern long  oggpackB_look(oggpack_buffer *b,int bits);
 139 extern long  oggpackB_look1(oggpack_buffer *b);
 140 extern void  oggpackB_adv(oggpack_buffer *b,int bits);
 141 extern void  oggpackB_adv1(oggpack_buffer *b);
 142 extern long  oggpackB_read(oggpack_buffer *b,int bits);
 143 extern long  oggpackB_read1(oggpack_buffer *b);
 144 extern long  oggpackB_bytes(oggpack_buffer *b);
 145 extern long  oggpackB_bits(oggpack_buffer *b);
 146 extern unsigned char *oggpackB_get_buffer(oggpack_buffer *b);
 147
 148 /* Ogg BITSTREAM PRIMITIVES: encoding **************************/
 149
 150 extern int      ogg_stream_packetin(ogg_stream_state *os, ogg_packet *op);
 151 extern int      ogg_stream_pageout(ogg_stream_state *os, ogg_page *og);
 152 extern int      ogg_stream_flush(ogg_stream_state *os, ogg_page *og);
 153
 154 /* Ogg BITSTREAM PRIMITIVES: decoding **************************/
 155
 156 extern int      ogg_sync_init(ogg_sync_state *oy);
 157 extern int      ogg_sync_clear(ogg_sync_state *oy);
 158 extern int      ogg_sync_reset(ogg_sync_state *oy);
 159 extern int      ogg_sync_destroy(ogg_sync_state *oy);
 160
 161 extern char    *ogg_sync_buffer(ogg_sync_state *oy, long size);
 162 extern int      ogg_sync_wrote(ogg_sync_state *oy, long bytes);
 163 extern long     ogg_sync_pageseek(ogg_sync_state *oy,ogg_page *og);
 164 extern int      ogg_sync_pageout(ogg_sync_state *oy, ogg_page *og);
 165 extern int      ogg_stream_pagein(ogg_stream_state *os, ogg_page *og);
 166 extern int      ogg_stream_packetout(ogg_stream_state *os,ogg_packet *op);
 167 extern int      ogg_stream_packetpeek(ogg_stream_state *os,ogg_packet *op);
 168
 169 /* Ogg BITSTREAM PRIMITIVES: general ***************************/
 170
 171 extern int      ogg_stream_init(ogg_stream_state *os,int serialno);
 172 extern int      ogg_stream_clear(ogg_stream_state *os);
 173 extern int      ogg_stream_reset(ogg_stream_state *os);
 174 extern int      ogg_stream_reset_serialno(ogg_stream_state *os,int serialno);
 175 extern int      ogg_stream_destroy(ogg_stream_state *os);
 176 extern int      ogg_stream_eos(ogg_stream_state *os);
 177
 178 extern void     ogg_page_checksum_set(ogg_page *og);
 179
 180 extern int      ogg_page_version(ogg_page *og);
 181 extern int      ogg_page_continued(ogg_page *og);
 182 extern int      ogg_page_bos(ogg_page *og);
 183 extern int      ogg_page_eos(ogg_page *og);
 184 extern ogg_int64_t  ogg_page_granulepos(ogg_page *og);
 185 extern int      ogg_page_serialno(ogg_page *og);
 186 extern long     ogg_page_pageno(ogg_page *og);
 187 extern int      ogg_page_packets(ogg_page *og);
 188
 189 extern void     ogg_packet_clear(ogg_packet *op);
 190
 191
 192 #ifdef __cplusplus
 193 }
 194 #endif
 195
 196 #endif  /* _OGG_H */