207 lines
7.9 KiB
C
207 lines
7.9 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* by the Xiph.Org Foundation http://www.xiph.org/ *
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* *
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********************************************************************
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function: toplevel libogg include
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last mod: $Id: ogg.h,v 1.1 2007/06/07 17:48:18 jules_rms Exp $
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********************************************************************/
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#ifndef _OGG_H
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#define _OGG_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "os_types.h"
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typedef struct {
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long endbyte;
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int endbit;
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unsigned char *buffer;
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unsigned char *ptr;
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long storage;
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} oggpack_buffer;
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/* ogg_page is used to encapsulate the data in one Ogg bitstream page *****/
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typedef struct {
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unsigned char *header;
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long header_len;
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unsigned char *body;
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long body_len;
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} ogg_page;
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static inline ogg_uint32_t ogg_bitreverse(ogg_uint32_t x){
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x= ((x>>16)&0x0000ffffUL) | ((x<<16)&0xffff0000UL);
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x= ((x>> 8)&0x00ff00ffUL) | ((x<< 8)&0xff00ff00UL);
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x= ((x>> 4)&0x0f0f0f0fUL) | ((x<< 4)&0xf0f0f0f0UL);
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x= ((x>> 2)&0x33333333UL) | ((x<< 2)&0xccccccccUL);
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return((x>> 1)&0x55555555UL) | ((x<< 1)&0xaaaaaaaaUL);
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}
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/* ogg_stream_state contains the current encode/decode state of a logical
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Ogg bitstream **********************************************************/
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typedef struct {
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unsigned char *body_data; /* bytes from packet bodies */
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long body_storage; /* storage elements allocated */
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long body_fill; /* elements stored; fill mark */
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long body_returned; /* elements of fill returned */
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int *lacing_vals; /* The values that will go to the segment table */
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ogg_int64_t *granule_vals; /* granulepos values for headers. Not compact
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this way, but it is simple coupled to the
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lacing fifo */
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long lacing_storage;
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long lacing_fill;
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long lacing_packet;
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long lacing_returned;
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unsigned char header[282]; /* working space for header encode */
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int header_fill;
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int e_o_s; /* set when we have buffered the last packet in the
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logical bitstream */
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int b_o_s; /* set after we've written the initial page
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of a logical bitstream */
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long serialno;
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long pageno;
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ogg_int64_t packetno; /* sequence number for decode; the framing
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knows where there's a hole in the data,
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but we need coupling so that the codec
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(which is in a seperate abstraction
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layer) also knows about the gap */
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ogg_int64_t granulepos;
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} ogg_stream_state;
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/* ogg_packet is used to encapsulate the data and metadata belonging
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to a single raw Ogg/Vorbis packet *************************************/
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typedef struct {
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unsigned char *packet;
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long bytes;
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long b_o_s;
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long e_o_s;
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ogg_int64_t granulepos;
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ogg_int64_t packetno; /* sequence number for decode; the framing
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knows where there's a hole in the data,
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but we need coupling so that the codec
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(which is in a seperate abstraction
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layer) also knows about the gap */
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} ogg_packet;
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typedef struct {
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unsigned char *data;
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int storage;
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int fill;
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int returned;
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int unsynced;
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int headerbytes;
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int bodybytes;
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} ogg_sync_state;
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/* Ogg BITSTREAM PRIMITIVES: bitstream ************************/
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extern void oggpack_writeinit(oggpack_buffer *b);
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extern void oggpack_writetrunc(oggpack_buffer *b,long bits);
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extern void oggpack_writealign(oggpack_buffer *b);
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extern void oggpack_writecopy(oggpack_buffer *b,void *source,long bits);
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extern void oggpack_reset(oggpack_buffer *b);
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extern void oggpack_writeclear(oggpack_buffer *b);
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extern void oggpack_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
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extern void oggpack_write(oggpack_buffer *b,unsigned long value,int bits);
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extern long oggpack_look(oggpack_buffer *b,int bits);
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extern long oggpack_look1(oggpack_buffer *b);
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extern void oggpack_adv(oggpack_buffer *b,int bits);
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extern void oggpack_adv1(oggpack_buffer *b);
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extern long oggpack_read(oggpack_buffer *b,int bits);
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extern long oggpack_read1(oggpack_buffer *b);
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extern long oggpack_bytes(oggpack_buffer *b);
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extern long oggpack_bits(oggpack_buffer *b);
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extern unsigned char *oggpack_get_buffer(oggpack_buffer *b);
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extern void oggpackB_writeinit(oggpack_buffer *b);
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extern void oggpackB_writetrunc(oggpack_buffer *b,long bits);
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extern void oggpackB_writealign(oggpack_buffer *b);
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extern void oggpackB_writecopy(oggpack_buffer *b,void *source,long bits);
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extern void oggpackB_reset(oggpack_buffer *b);
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extern void oggpackB_writeclear(oggpack_buffer *b);
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extern void oggpackB_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
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extern void oggpackB_write(oggpack_buffer *b,unsigned long value,int bits);
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extern long oggpackB_look(oggpack_buffer *b,int bits);
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extern long oggpackB_look1(oggpack_buffer *b);
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extern void oggpackB_adv(oggpack_buffer *b,int bits);
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extern void oggpackB_adv1(oggpack_buffer *b);
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extern long oggpackB_read(oggpack_buffer *b,int bits);
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extern long oggpackB_read1(oggpack_buffer *b);
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extern long oggpackB_bytes(oggpack_buffer *b);
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extern long oggpackB_bits(oggpack_buffer *b);
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extern unsigned char *oggpackB_get_buffer(oggpack_buffer *b);
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/* Ogg BITSTREAM PRIMITIVES: encoding **************************/
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extern int ogg_stream_packetin(ogg_stream_state *os, ogg_packet *op);
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extern int ogg_stream_pageout(ogg_stream_state *os, ogg_page *og);
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extern int ogg_stream_flush(ogg_stream_state *os, ogg_page *og);
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/* Ogg BITSTREAM PRIMITIVES: decoding **************************/
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extern int ogg_sync_init(ogg_sync_state *oy);
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extern int ogg_sync_clear(ogg_sync_state *oy);
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extern int ogg_sync_reset(ogg_sync_state *oy);
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extern int ogg_sync_destroy(ogg_sync_state *oy);
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extern char *ogg_sync_buffer(ogg_sync_state *oy, long size);
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extern int ogg_sync_wrote(ogg_sync_state *oy, long bytes);
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extern long ogg_sync_pageseek(ogg_sync_state *oy,ogg_page *og);
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extern int ogg_sync_pageout(ogg_sync_state *oy, ogg_page *og);
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extern int ogg_stream_pagein(ogg_stream_state *os, ogg_page *og);
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extern int ogg_stream_packetout(ogg_stream_state *os,ogg_packet *op);
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extern int ogg_stream_packetpeek(ogg_stream_state *os,ogg_packet *op);
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/* Ogg BITSTREAM PRIMITIVES: general ***************************/
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extern int ogg_stream_init(ogg_stream_state *os,int serialno);
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extern int ogg_stream_clear(ogg_stream_state *os);
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extern int ogg_stream_reset(ogg_stream_state *os);
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extern int ogg_stream_reset_serialno(ogg_stream_state *os,int serialno);
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extern int ogg_stream_destroy(ogg_stream_state *os);
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extern int ogg_stream_eos(ogg_stream_state *os);
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extern void ogg_page_checksum_set(ogg_page *og);
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extern int ogg_page_version(ogg_page *og);
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extern int ogg_page_continued(ogg_page *og);
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extern int ogg_page_bos(ogg_page *og);
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extern int ogg_page_eos(ogg_page *og);
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extern ogg_int64_t ogg_page_granulepos(ogg_page *og);
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extern int ogg_page_serialno(ogg_page *og);
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extern long ogg_page_pageno(ogg_page *og);
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extern int ogg_page_packets(ogg_page *og);
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extern void ogg_packet_clear(ogg_packet *op);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _OGG_H */
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