ogg.h
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上传日期:2010-03-30
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VC书籍
开发平台:
Visual C++
- /********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis SOFTWARE 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 SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
- * by the XIPHOPHORUS Company http://www.xiph.org/ *
- ********************************************************************
- function: toplevel libogg include
- last mod: $Id: ogg.h,v 1.1.1.1 2003/02/06 04:06:45 hurly Exp $
- ********************************************************************/
- #ifndef _OGG_H
- #define _OGG_H
- #ifdef __cplusplus
- extern "C" {
- #endif
- #include "os_types.h"
- typedef struct {
- long endbyte;
- int endbit;
- unsigned char *buffer;
- unsigned char *ptr;
- long storage;
- } oggpack_buffer;
- /* ogg_page is used to encapsulate the data in one Ogg bitstream page *****/
- typedef struct {
- unsigned char *header;
- long header_len;
- unsigned char *body;
- long body_len;
- } ogg_page;
- /* ogg_stream_state contains the current encode/decode state of a logical
- Ogg bitstream **********************************************************/
- typedef struct {
- unsigned char *body_data; /* bytes from packet bodies */
- long body_storage; /* storage elements allocated */
- long body_fill; /* elements stored; fill mark */
- long body_returned; /* elements of fill returned */
- int *lacing_vals; /* The values that will go to the segment table */
- ogg_int64_t *granule_vals; /* granulepos values for headers. Not compact
- this way, but it is simple coupled to the
- lacing fifo */
- long lacing_storage;
- long lacing_fill;
- long lacing_packet;
- long lacing_returned;
- unsigned char header[282]; /* working space for header encode */
- int header_fill;
- 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;
- } ogg_stream_state;
- /* ogg_packet is used to encapsulate the data and metadata belonging
- to a single raw Ogg/Vorbis packet *************************************/
- typedef struct {
- unsigned char *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 {
- unsigned char *data;
- int storage;
- int fill;
- int returned;
- int unsynced;
- int headerbytes;
- int bodybytes;
- } ogg_sync_state;
- /* Ogg BITSTREAM PRIMITIVES: bitstream ************************/
- extern void oggpack_writeinit(oggpack_buffer *b);
- extern void oggpack_reset(oggpack_buffer *b);
- extern void oggpack_writeclear(oggpack_buffer *b);
- extern void oggpack_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
- extern void oggpack_write(oggpack_buffer *b,unsigned long value,int bits);
- extern long oggpack_look(oggpack_buffer *b,int bits);
- extern long oggpack_look_huff(oggpack_buffer *b,int bits);
- extern long oggpack_look1(oggpack_buffer *b);
- extern void oggpack_adv(oggpack_buffer *b,int bits);
- extern int oggpack_adv_huff(oggpack_buffer *b,int bits);
- extern void oggpack_adv1(oggpack_buffer *b);
- extern long oggpack_read(oggpack_buffer *b,int bits);
- extern long oggpack_read1(oggpack_buffer *b);
- extern long oggpack_bytes(oggpack_buffer *b);
- extern long oggpack_bits(oggpack_buffer *b);
- extern unsigned char *oggpack_get_buffer(oggpack_buffer *b);
- /* Ogg BITSTREAM PRIMITIVES: encoding **************************/
- extern int ogg_stream_packetin(ogg_stream_state *os, ogg_packet *op);
- extern int ogg_stream_pageout(ogg_stream_state *os, ogg_page *og);
- extern int ogg_stream_flush(ogg_stream_state *os, ogg_page *og);
- /* Ogg BITSTREAM PRIMITIVES: decoding **************************/
- extern int ogg_sync_init(ogg_sync_state *oy);
- extern int ogg_sync_clear(ogg_sync_state *oy);
- extern int ogg_sync_reset(ogg_sync_state *oy);
- extern int ogg_sync_destroy(ogg_sync_state *oy);
- extern char *ogg_sync_buffer(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_sync_pageout(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);
- /* Ogg BITSTREAM PRIMITIVES: general ***************************/
- extern int ogg_stream_init(ogg_stream_state *os,int serialno);
- extern int ogg_stream_clear(ogg_stream_state *os);
- extern int ogg_stream_reset(ogg_stream_state *os);
- extern int ogg_stream_destroy(ogg_stream_state *os);
- extern int ogg_stream_eos(ogg_stream_state *os);
- 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 int ogg_page_serialno(ogg_page *og);
- extern long ogg_page_pageno(ogg_page *og);
- extern int ogg_page_packets(ogg_page *og);
- extern void ogg_packet_clear(ogg_packet *op);
- #ifdef __cplusplus
- }
- #endif
- #endif /* _OGG_H */