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  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 1994-2007             *
  9.  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10.  *                                                                  *
  11.  ********************************************************************
  12.  
  13.  function: toplevel libogg include
  14.  last mod: $Id: ogg.h 18044 2011-08-01 17:55:20Z gmaxwell $
  15.  
  16.  ********************************************************************/
  17. #ifndef _OGG_H
  18. #define _OGG_H
  19.  
  20. #ifdef __cplusplus
  21. extern "C" {
  22. #endif
  23.  
  24. #include <stddef.h>
  25. #include <ogg/os_types.h>
  26.  
  27. typedef struct {
  28.   void *iov_base;
  29.   size_t iov_len;
  30. } ogg_iovec_t;
  31.  
  32. typedef struct {
  33.   long endbyte;
  34.   int  endbit;
  35.  
  36.   unsigned char *buffer;
  37.   unsigned char *ptr;
  38.   long storage;
  39. } oggpack_buffer;
  40.  
  41. /* ogg_page is used to encapsulate the data in one Ogg bitstream page *****/
  42.  
  43. typedef struct {
  44.   unsigned char *header;
  45.   long header_len;
  46.   unsigned char *body;
  47.   long body_len;
  48. } ogg_page;
  49.  
  50. /* ogg_stream_state contains the current encode/decode state of a logical
  51.    Ogg bitstream **********************************************************/
  52.  
  53. typedef struct {
  54.   unsigned char   *body_data;    /* bytes from packet bodies */
  55.   long    body_storage;          /* storage elements allocated */
  56.   long    body_fill;             /* elements stored; fill mark */
  57.   long    body_returned;         /* elements of fill returned */
  58.  
  59.  
  60.   int     *lacing_vals;      /* The values that will go to the segment table */
  61.   ogg_int64_t *granule_vals; /* granulepos values for headers. Not compact
  62.                                 this way, but it is simple coupled to the
  63.                                 lacing fifo */
  64.   long    lacing_storage;
  65.   long    lacing_fill;
  66.   long    lacing_packet;
  67.   long    lacing_returned;
  68.  
  69.   unsigned char    header[282];      /* working space for header encode */
  70.   int              header_fill;
  71.  
  72.   int     e_o_s;          /* set when we have buffered the last packet in the
  73.                              logical bitstream */
  74.   int     b_o_s;          /* set after we've written the initial page
  75.                              of a logical bitstream */
  76.   long    serialno;
  77.   long    pageno;
  78.   ogg_int64_t  packetno;  /* sequence number for decode; the framing
  79.                              knows where there's a hole in the data,
  80.                              but we need coupling so that the codec
  81.                              (which is in a separate abstraction
  82.                              layer) also knows about the gap */
  83.   ogg_int64_t   granulepos;
  84.  
  85. } ogg_stream_state;
  86.  
  87. /* ogg_packet is used to encapsulate the data and metadata belonging
  88.    to a single raw Ogg/Vorbis packet *************************************/
  89.  
  90. typedef struct {
  91.   unsigned char *packet;
  92.   long  bytes;
  93.   long  b_o_s;
  94.   long  e_o_s;
  95.  
  96.   ogg_int64_t  granulepos;
  97.  
  98.   ogg_int64_t  packetno;     /* sequence number for decode; the framing
  99.                                 knows where there's a hole in the data,
  100.                                 but we need coupling so that the codec
  101.                                 (which is in a separate abstraction
  102.                                 layer) also knows about the gap */
  103. } ogg_packet;
  104.  
  105. typedef struct {
  106.   unsigned char *data;
  107.   int storage;
  108.   int fill;
  109.   int returned;
  110.  
  111.   int unsynced;
  112.   int headerbytes;
  113.   int bodybytes;
  114. } ogg_sync_state;
  115.  
  116. /* Ogg BITSTREAM PRIMITIVES: bitstream ************************/
  117.  
  118. extern void  oggpack_writeinit(oggpack_buffer *b);
  119. extern int   oggpack_writecheck(oggpack_buffer *b);
  120. extern void  oggpack_writetrunc(oggpack_buffer *b,long bits);
  121. extern void  oggpack_writealign(oggpack_buffer *b);
  122. extern void  oggpack_writecopy(oggpack_buffer *b,void *source,long bits);
  123. extern void  oggpack_reset(oggpack_buffer *b);
  124. extern void  oggpack_writeclear(oggpack_buffer *b);
  125. extern void  oggpack_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
  126. extern void  oggpack_write(oggpack_buffer *b,unsigned long value,int bits);
  127. extern long  oggpack_look(oggpack_buffer *b,int bits);
  128. extern long  oggpack_look1(oggpack_buffer *b);
  129. extern void  oggpack_adv(oggpack_buffer *b,int bits);
  130. extern void  oggpack_adv1(oggpack_buffer *b);
  131. extern long  oggpack_read(oggpack_buffer *b,int bits);
  132. extern long  oggpack_read1(oggpack_buffer *b);
  133. extern long  oggpack_bytes(oggpack_buffer *b);
  134. extern long  oggpack_bits(oggpack_buffer *b);
  135. extern unsigned char *oggpack_get_buffer(oggpack_buffer *b);
  136.  
  137. extern void  oggpackB_writeinit(oggpack_buffer *b);
  138. extern int   oggpackB_writecheck(oggpack_buffer *b);
  139. extern void  oggpackB_writetrunc(oggpack_buffer *b,long bits);
  140. extern void  oggpackB_writealign(oggpack_buffer *b);
  141. extern void  oggpackB_writecopy(oggpack_buffer *b,void *source,long bits);
  142. extern void  oggpackB_reset(oggpack_buffer *b);
  143. extern void  oggpackB_writeclear(oggpack_buffer *b);
  144. extern void  oggpackB_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
  145. extern void  oggpackB_write(oggpack_buffer *b,unsigned long value,int bits);
  146. extern long  oggpackB_look(oggpack_buffer *b,int bits);
  147. extern long  oggpackB_look1(oggpack_buffer *b);
  148. extern void  oggpackB_adv(oggpack_buffer *b,int bits);
  149. extern void  oggpackB_adv1(oggpack_buffer *b);
  150. extern long  oggpackB_read(oggpack_buffer *b,int bits);
  151. extern long  oggpackB_read1(oggpack_buffer *b);
  152. extern long  oggpackB_bytes(oggpack_buffer *b);
  153. extern long  oggpackB_bits(oggpack_buffer *b);
  154. extern unsigned char *oggpackB_get_buffer(oggpack_buffer *b);
  155.  
  156. /* Ogg BITSTREAM PRIMITIVES: encoding **************************/
  157.  
  158. extern int      ogg_stream_packetin(ogg_stream_state *os, ogg_packet *op);
  159. extern int      ogg_stream_iovecin(ogg_stream_state *os, ogg_iovec_t *iov,
  160.                                    int count, long e_o_s, ogg_int64_t granulepos);
  161. extern int      ogg_stream_pageout(ogg_stream_state *os, ogg_page *og);
  162. extern int      ogg_stream_pageout_fill(ogg_stream_state *os, ogg_page *og, int nfill);
  163. extern int      ogg_stream_flush(ogg_stream_state *os, ogg_page *og);
  164. extern int      ogg_stream_flush_fill(ogg_stream_state *os, ogg_page *og, int nfill);
  165.  
  166. /* Ogg BITSTREAM PRIMITIVES: decoding **************************/
  167.  
  168. extern int      ogg_sync_init(ogg_sync_state *oy);
  169. extern int      ogg_sync_clear(ogg_sync_state *oy);
  170. extern int      ogg_sync_reset(ogg_sync_state *oy);
  171. extern int      ogg_sync_destroy(ogg_sync_state *oy);
  172. extern int      ogg_sync_check(ogg_sync_state *oy);
  173.  
  174. extern char    *ogg_sync_buffer(ogg_sync_state *oy, long size);
  175. extern int      ogg_sync_wrote(ogg_sync_state *oy, long bytes);
  176. extern long     ogg_sync_pageseek(ogg_sync_state *oy,ogg_page *og);
  177. extern int      ogg_sync_pageout(ogg_sync_state *oy, ogg_page *og);
  178. extern int      ogg_stream_pagein(ogg_stream_state *os, ogg_page *og);
  179. extern int      ogg_stream_packetout(ogg_stream_state *os,ogg_packet *op);
  180. extern int      ogg_stream_packetpeek(ogg_stream_state *os,ogg_packet *op);
  181.  
  182. /* Ogg BITSTREAM PRIMITIVES: general ***************************/
  183.  
  184. extern int      ogg_stream_init(ogg_stream_state *os,int serialno);
  185. extern int      ogg_stream_clear(ogg_stream_state *os);
  186. extern int      ogg_stream_reset(ogg_stream_state *os);
  187. extern int      ogg_stream_reset_serialno(ogg_stream_state *os,int serialno);
  188. extern int      ogg_stream_destroy(ogg_stream_state *os);
  189. extern int      ogg_stream_check(ogg_stream_state *os);
  190. extern int      ogg_stream_eos(ogg_stream_state *os);
  191.  
  192. extern void     ogg_page_checksum_set(ogg_page *og);
  193.  
  194. extern int      ogg_page_version(const ogg_page *og);
  195. extern int      ogg_page_continued(const ogg_page *og);
  196. extern int      ogg_page_bos(const ogg_page *og);
  197. extern int      ogg_page_eos(const ogg_page *og);
  198. extern ogg_int64_t  ogg_page_granulepos(const ogg_page *og);
  199. extern int      ogg_page_serialno(const ogg_page *og);
  200. extern long     ogg_page_pageno(const ogg_page *og);
  201. extern int      ogg_page_packets(const ogg_page *og);
  202.  
  203. extern void     ogg_packet_clear(ogg_packet *op);
  204.  
  205.  
  206. #ifdef __cplusplus
  207. }
  208. #endif
  209.  
  210. #endif  /* _OGG_H */
  211.