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/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
* *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
* *
********************************************************************
function: subsumed libogg includes
********************************************************************/
#ifndef _OGG_H
#define _OGG_H
#ifdef __cplusplus
extern "C" {
#endif
#include "os_types.h"
typedef struct ogg_buffer_state{
struct ogg_buffer *unused_buffers;
struct ogg_reference *unused_references;
int outstanding;
int shutdown;
} ogg_buffer_state;
typedef struct ogg_buffer {
unsigned char *data;
long size;
int refcount;
union {
ogg_buffer_state *owner;
struct ogg_buffer *next;
} ptr;
} ogg_buffer;
typedef struct ogg_reference {
ogg_buffer *buffer;
long begin;
long length;
struct ogg_reference *next;
} ogg_reference;
typedef struct oggpack_buffer {
int headbit;
unsigned char *headptr;
long headend;
/* memory management */
ogg_reference *head;
ogg_reference *tail;
/* render the byte/bit counter API constant time */
long count; /* doesn't count the tail */
} oggpack_buffer;
typedef struct oggbyte_buffer {
ogg_reference *baseref;
ogg_reference *ref;
unsigned char *ptr;
long pos;
long end;
} oggbyte_buffer;
typedef struct ogg_sync_state {
/* decode memory management pool */
ogg_buffer_state *bufferpool;
/* stream buffers */
ogg_reference *fifo_head;
ogg_reference *fifo_tail;
long fifo_fill;
/* stream sync management */
int unsynced;
int headerbytes;
int bodybytes;
} ogg_sync_state;
typedef struct ogg_stream_state {
ogg_reference *header_head;
ogg_reference *header_tail;
ogg_reference *body_head;
ogg_reference *body_tail;
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;
long 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;
int lacing_fill;
ogg_uint32_t body_fill;
/* decode-side state data */
int holeflag;
int spanflag;
int clearflag;
int laceptr;
ogg_uint32_t body_fill_next;
} ogg_stream_state;
typedef struct {
ogg_reference *packet;
long bytes;
long b_o_s;
long e_o_s;
ogg_int64_t granulepos;
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_packet;
typedef struct {
ogg_reference *header;
int header_len;
ogg_reference *body;
long body_len;
} ogg_page;
/* Ogg BITSTREAM PRIMITIVES: bitstream ************************/
extern void oggpack_readinit(oggpack_buffer *b,ogg_reference *r);
extern long oggpack_look_full(oggpack_buffer *b,int bits);
extern long oggpack_read(oggpack_buffer *b,int bits);
/* Inline a few, often called functions */
/* mark read process as having run off the end */
static inline void _adv_halt(oggpack_buffer *b){
b->headptr=b->head->buffer->data+b->head->begin+b->head->length;
b->headend=-1;
b->headbit=0;
}
/* spans forward, skipping as many bytes as headend is negative; if
headend is zero, simply finds next byte. If we're up to the end
of the buffer, leaves headend at zero. If we've read past the end,
halt the decode process. */
static inline void _span(oggpack_buffer *b){
while(b->headend<1){
if(b->head->next){
b->count+=b->head->length;
b->head=b->head->next;
b->headptr=b->head->buffer->data+b->head->begin-b->headend;
b->headend+=b->head->length;
}else{
/* we've either met the end of decode, or gone past it. halt
only if we're past */
if(b->headend<0 || b->headbit)
/* read has fallen off the end */
_adv_halt(b);
break;
}
}
}
/* limited to 32 at a time */
static inline void oggpack_adv(oggpack_buffer *b,int bits){
bits+=b->headbit;
b->headbit=bits&7;
b->headptr+=bits/8;
if((b->headend-=((unsigned)bits)/8)<1)_span(b);
}
static inline long oggpack_look(oggpack_buffer *b, int bits){
if(bits+b->headbit < b->headend<<3){
extern const unsigned long oggpack_mask[];
unsigned long m=oggpack_mask[bits];
unsigned long ret=-1;
bits+=b->headbit;
ret=b->headptr[0]>>b->headbit;
if(bits>8){
ret|=b->headptr[1]<<(8-b->headbit);
if(bits>16){
ret|=b->headptr[2]<<(16-b->headbit);
if(bits>24){
ret|=b->headptr[3]<<(24-b->headbit);
if(bits>32 && b->headbit)
ret|=b->headptr[4]<<(32-b->headbit);
}
}
}
return ret&m;
}else{
return oggpack_look_full(b, bits);
}
}
/* Ogg BITSTREAM PRIMITIVES: decoding **************************/
extern ogg_sync_state *ogg_sync_create(void);
extern int ogg_sync_destroy(ogg_sync_state *oy);
extern int ogg_sync_reset(ogg_sync_state *oy);
extern unsigned char *ogg_sync_bufferin(ogg_sync_state *oy, long size);
extern int ogg_sync_wrote(ogg_sync_state *oy, long bytes);
extern long ogg_sync_pageseek(ogg_sync_state *oy,ogg_page *og);
extern int ogg_stream_pagein(ogg_stream_state *os, ogg_page *og);
extern int ogg_stream_packetout(ogg_stream_state *os,ogg_packet *op);
extern int ogg_stream_packetpeek(ogg_stream_state *os,ogg_packet *op);
/* Ogg BITSTREAM PRIMITIVES: general ***************************/
extern ogg_stream_state *ogg_stream_create(int serialno);
extern int ogg_stream_destroy(ogg_stream_state *os);
extern int ogg_stream_reset(ogg_stream_state *os);
extern int ogg_stream_reset_serialno(ogg_stream_state *os,int serialno);
extern int ogg_stream_eos(ogg_stream_state *os);
extern int ogg_page_checksum_set(ogg_page *og);
extern int ogg_page_version(ogg_page *og);
extern int ogg_page_continued(ogg_page *og);
extern int ogg_page_bos(ogg_page *og);
extern int ogg_page_eos(ogg_page *og);
extern ogg_int64_t ogg_page_granulepos(ogg_page *og);
extern ogg_uint32_t ogg_page_serialno(ogg_page *og);
extern ogg_uint32_t ogg_page_pageno(ogg_page *og);
extern int ogg_page_getbuffer(ogg_page *og, unsigned char **buffer);
extern int ogg_packet_release(ogg_packet *op);
extern int ogg_page_release(ogg_page *og);
extern void ogg_page_dup(ogg_page *d, ogg_page *s);
/* Ogg BITSTREAM PRIMITIVES: return codes ***************************/
#define OGG_SUCCESS 0
#define OGG_HOLE -10
#define OGG_SPAN -11
#define OGG_EVERSION -12
#define OGG_ESERIAL -13
#define OGG_EINVAL -14
#define OGG_EEOS -15
#ifdef __cplusplus
}
#endif
#endif /* _OGG_H */
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