+
−/********************************************************************
+
− *                                                                  *
+
− * 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 1994-2002             *
+
− * by the Xiph.Org Foundation http://www.xiph.org/                  *
+
− *                                                                  *
+
− ********************************************************************/
+
−
+
−#ifndef _OGGVORBIS_H
+
−#define _OGGVORBIS_H
+
−
+
−/*data types for ogg and vorbis that are required to be external*/
+
−#ifndef ogg_int64_t	
+
−#define ogg_int64_t int64_t
+
−#endif
+
−
+
−typedef struct {
+
−        unsigned char *data;
+
−        int storage;
+
−        int fill;
+
−        int returned;
+
−        int unsynced;
+
−        int headerbytes;
+
−        int bodybytes;
+
−} ogg_sync_state;
+
−typedef struct vorbis_info{
+
−        int version;
+
−        int channels;
+
−        long rate;
+
−        /* The below bitrate declarations are *hints*.
+
−         Combinations of the three values carry the following implications: all three set to the same value: implies a fixed rate bitstream
+
−         only nominal set: implies a VBR stream that averages the nominal bitrate.  No hard upper/lower limit
+
−         upper and or lower set: implies a VBR bitstream that obeys the bitrate limits. nominal may also be set to give a nominal rate.
+
−         none set: the coder does not care to speculate. */
+
−        long bitrate_upper;
+
−        long bitrate_nominal;
+
−        long bitrate_lower;
+
−        long bitrate_window;
+
−        void *codec_setup;
+
−} vorbis_info;
+
−typedef struct vorbis_comment{
+
−        /* unlimited user comment fields.  libvorbis writes 'libvorbis' whatever vendor is set to in encode */
+
−        char **user_comments;
+
−        int   *comment_lengths;
+
−        int    comments;
+
−        char  *vendor;
+
−} vorbis_comment;
+
−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;
+
−typedef struct vorbis_dsp_state{
+
−        int analysisp;
+
−        vorbis_info *vi;
+
−        float **pcm;
+
−        float **pcmret;
+
−        int  pcm_storage;
+
−        int  pcm_current;
+
−        int  pcm_returned;
+
−        int  preextrapolate;
+
−        int  eofflag;
+
−        long lW;
+
−        long W;
+
−        long nW;
+
−        long centerW;
+
−        ogg_int64_t granulepos;
+
−        ogg_int64_t sequence;
+
−        ogg_int64_t glue_bits;
+
−        ogg_int64_t time_bits;
+
−        ogg_int64_t floor_bits;
+
−        ogg_int64_t res_bits;
+
−        void       *backend_state;
+
−} vorbis_dsp_state;
+
−typedef struct {
+
−        long endbyte;
+
−        int  endbit;
+
−        unsigned char *buffer;
+
−        unsigned char *ptr;
+
−        long storage;
+
−} oggpack_buffer;
+
−typedef struct vorbis_block{
+
−        /* necessary stream state for linking to the framing abstraction */
+
−        float **pcm;       /* this is a pointer into local storage */
+
−        oggpack_buffer opb;
+
−        long  lW;
+
−        long  W;
+
−        long  nW;
+
−        int   pcmend;
+
−        int   mode;
+
−        int   eofflag;
+
−        ogg_int64_t granulepos;
+
−        ogg_int64_t sequence;
+
−        vorbis_dsp_state *vd; /* For read-only access of configuration */
+
−        /* local storage to avoid remallocing; it's up to the mapping to structure it */
+
−        void  *localstore;
+
−        long  localtop;
+
−        long  localalloc;
+
−        long  totaluse;
+
−        struct alloc_chain *reap;
+
−        /* bitmetrics for the frame */
+
−        long glue_bits;
+
−        long time_bits;
+
−        long floor_bits;
+
−        long res_bits;
+
−        void *internal;
+
−} vorbis_block;
+
−typedef struct {
+
−        size_t (*read_func)  (void *ptr, size_t size, size_t nmemb, void *datasource);
+
−        int    (*seek_func)  (void *datasource, ogg_int64_t offset, int whence);
+
−        int    (*close_func) (void *datasource);
+
−        long   (*tell_func)  (void *datasource);
+
−} ov_callbacks;
+
−typedef struct OggVorbis_File {
+
−        void            *datasource; /* Pointer to a FILE *, etc. */
+
−        int              seekable;
+
−        ogg_int64_t      offset;
+
−        ogg_int64_t      end;
+
−        ogg_sync_state   oy;
+
−        /* If the FILE handle isn't seekable (eg, a pipe), only the current stream appears */
+
−        int              links;
+
−        ogg_int64_t     *offsets;
+
−        ogg_int64_t     *dataoffsets;
+
−        long            *serialnos;
+
−        ogg_int64_t     *pcmlengths; 
+
−        /* overloaded to maintain binary
+
−         compatability; x2 size, stores both
+
−         beginning and end values */
+
−        vorbis_info     *vi;
+
−        vorbis_comment  *vc;
+
−        /* Decoding working state local storage */
+
−        ogg_int64_t      pcm_offset;
+
−        int              ready_state;
+
−        long             current_serialno;
+
−        int              current_link;
+
−        double           bittrack;
+
−        double           samptrack;
+
−        ogg_stream_state os; /* take physical pages, weld into a logical stream of packets */
+
−        vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
+
−        vorbis_block     vb; /* local working space for packet->PCM decode */
+
−        ov_callbacks callbacks;
+
−} OggVorbis_File;
+
−
+
−
+
−extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
+
−extern int ov_fopen(char *path,OggVorbis_File *vf);
+
−extern long ov_read(OggVorbis_File *vf,char *buffer,int length,int bigendianp,int word,int sgned,int *bitstream);
+
−extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
+
−extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
+
−extern vorbis_comment *ov_comment(OggVorbis_File *f, int num);
+
−extern int ov_clear(OggVorbis_File *vf);
+
−
+
−#endif /*_OGGVORBIS_H*/