openalbridge/oggvorbis.h
author mbait
Sun, 28 Mar 2010 23:10:33 +0000
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/********************************************************************
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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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#ifndef _OGGVORBIS_H
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#define _OGGVORBIS_H
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/*data types for ogg and vorbis that are required to be external*/
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#ifndef ogg_int64_t	
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#define ogg_int64_t int64_t
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#endif
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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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typedef struct vorbis_info{
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        int version;
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        int channels;
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        long rate;
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        /* The below bitrate declarations are *hints*.
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         Combinations of the three values carry the following implications: all three set to the same value: implies a fixed rate bitstream
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         only nominal set: implies a VBR stream that averages the nominal bitrate.  No hard upper/lower limit
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         upper and or lower set: implies a VBR bitstream that obeys the bitrate limits. nominal may also be set to give a nominal rate.
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         none set: the coder does not care to speculate. */
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        long bitrate_upper;
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        long bitrate_nominal;
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        long bitrate_lower;
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        long bitrate_window;
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        void *codec_setup;
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} vorbis_info;
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typedef struct vorbis_comment{
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        /* unlimited user comment fields.  libvorbis writes 'libvorbis' whatever vendor is set to in encode */
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        char **user_comments;
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        int   *comment_lengths;
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        int    comments;
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        char  *vendor;
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} vorbis_comment;
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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; 
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        /* granulepos values for headers. Not compact this way, but it is simple coupled to the 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 logical bitstream */
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        int     b_o_s;          /* set after we've written the initial page of a logical bitstream */
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        long    serialno;
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        long    pageno;
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        ogg_int64_t  packetno;      
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        /* sequence number for decode; the framing knows where there's a hole in the data,
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         but we need coupling so that the codec (which is in a seperate abstraction 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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typedef struct vorbis_dsp_state{
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        int analysisp;
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        vorbis_info *vi;
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        float **pcm;
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        float **pcmret;
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        int  pcm_storage;
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        int  pcm_current;
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        int  pcm_returned;
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        int  preextrapolate;
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        int  eofflag;
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        long lW;
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        long W;
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        long nW;
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        long centerW;
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        ogg_int64_t granulepos;
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        ogg_int64_t sequence;
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        ogg_int64_t glue_bits;
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        ogg_int64_t time_bits;
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        ogg_int64_t floor_bits;
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        ogg_int64_t res_bits;
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        void       *backend_state;
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} vorbis_dsp_state;
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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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typedef struct vorbis_block{
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        /* necessary stream state for linking to the framing abstraction */
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        float **pcm;       /* this is a pointer into local storage */
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        oggpack_buffer opb;
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        long  lW;
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        long  W;
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        long  nW;
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        int   pcmend;
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        int   mode;
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        int   eofflag;
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        ogg_int64_t granulepos;
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        ogg_int64_t sequence;
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        vorbis_dsp_state *vd; /* For read-only access of configuration */
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        /* local storage to avoid remallocing; it's up to the mapping to structure it */
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        void  *localstore;
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        long  localtop;
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        long  localalloc;
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        long  totaluse;
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        struct alloc_chain *reap;
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        /* bitmetrics for the frame */
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        long glue_bits;
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        long time_bits;
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        long floor_bits;
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        long res_bits;
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        void *internal;
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} vorbis_block;
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typedef struct {
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        size_t (*read_func)  (void *ptr, size_t size, size_t nmemb, void *datasource);
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        int    (*seek_func)  (void *datasource, ogg_int64_t offset, int whence);
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        int    (*close_func) (void *datasource);
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        long   (*tell_func)  (void *datasource);
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} ov_callbacks;
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typedef struct OggVorbis_File {
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        void            *datasource; /* Pointer to a FILE *, etc. */
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        int              seekable;
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        ogg_int64_t      offset;
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        ogg_int64_t      end;
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        ogg_sync_state   oy;
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        /* If the FILE handle isn't seekable (eg, a pipe), only the current stream appears */
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        int              links;
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        ogg_int64_t     *offsets;
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        ogg_int64_t     *dataoffsets;
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        long            *serialnos;
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        ogg_int64_t     *pcmlengths; 
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        /* overloaded to maintain binary
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         compatability; x2 size, stores both
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         beginning and end values */
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        vorbis_info     *vi;
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        vorbis_comment  *vc;
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        /* Decoding working state local storage */
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        ogg_int64_t      pcm_offset;
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        int              ready_state;
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        long             current_serialno;
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        int              current_link;
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        double           bittrack;
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        double           samptrack;
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        ogg_stream_state os; /* take physical pages, weld into a logical stream of packets */
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        vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
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        vorbis_block     vb; /* local working space for packet->PCM decode */
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        ov_callbacks callbacks;
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} OggVorbis_File;
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extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
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extern int ov_fopen(char *path,OggVorbis_File *vf);
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extern long ov_read(OggVorbis_File *vf,char *buffer,int length,int bigendianp,int word,int sgned,int *bitstream);
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extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
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extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
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extern vorbis_comment *ov_comment(OggVorbis_File *f, int num);
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extern int ov_clear(OggVorbis_File *vf);
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#endif /*_OGGVORBIS_H*/