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backends.h (5006B)


      1 /********************************************************************
      2  *                                                                  *
      3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
      4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
      5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
      6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
      7  *                                                                  *
      8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002             *
      9  * by the XIPHOPHORUS Company http://www.xiph.org/                  *
     10  *                                                                  *
     11  ********************************************************************
     12 
     13  function: libvorbis backend and mapping structures; needed for 
     14            static mode headers
     15  last mod: $Id: backends.h 1919 2005-07-24 14:18:04Z baford $
     16 
     17  ********************************************************************/
     18 
     19 /* this is exposed up here because we need it for static modes.
     20    Lookups for each backend aren't exposed because there's no reason
     21    to do so */
     22 
     23 #ifndef _vorbis_backend_h_
     24 #define _vorbis_backend_h_
     25 
     26 #include "codec_internal.h"
     27 
     28 /* this would all be simpler/shorter with templates, but.... */
     29 /* Floor backend generic *****************************************/
     30 typedef struct{
     31   void                   (*pack)  (vorbis_info_floor *,oggpack_buffer *);
     32   vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
     33   vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_floor *);
     34   void (*free_info) (vorbis_info_floor *);
     35   void (*free_look) (vorbis_look_floor *);
     36   void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
     37   int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
     38 		     void *buffer,float *);
     39 } vorbis_func_floor;
     40 
     41 typedef struct{
     42   int   order;
     43   long  rate;
     44   long  barkmap;
     45 
     46   int   ampbits;
     47   int   ampdB;
     48 
     49   int   numbooks; /* <= 16 */
     50   int   books[16];
     51 
     52   float lessthan;     /* encode-only config setting hacks for libvorbis */
     53   float greaterthan;  /* encode-only config setting hacks for libvorbis */
     54 
     55 } vorbis_info_floor0;
     56 
     57 
     58 #define VIF_POSIT 63
     59 #define VIF_CLASS 16
     60 #define VIF_PARTS 31
     61 typedef struct{
     62   int   partitions;                /* 0 to 31 */
     63   int   partitionclass[VIF_PARTS]; /* 0 to 15 */
     64 
     65   int   class_dim[VIF_CLASS];        /* 1 to 8 */
     66   int   class_subs[VIF_CLASS];       /* 0,1,2,3 (bits: 1<<n poss) */
     67   int   class_book[VIF_CLASS];       /* subs ^ dim entries */
     68   int   class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
     69 
     70 
     71   int   mult;                      /* 1 2 3 or 4 */ 
     72   int   postlist[VIF_POSIT+2];    /* first two implicit */ 
     73 
     74 
     75   /* encode side analysis parameters */
     76   float maxover;     
     77   float maxunder;  
     78   float maxerr;    
     79 
     80   float twofitweight;  
     81   float twofitatten;
     82 
     83   int   n;
     84 
     85 } vorbis_info_floor1;
     86 
     87 /* Residue backend generic *****************************************/
     88 typedef struct{
     89   void                 (*pack)  (vorbis_info_residue *,oggpack_buffer *);
     90   vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
     91   vorbis_look_residue *(*look)  (vorbis_dsp_state *,
     92 				 vorbis_info_residue *);
     93   void (*free_info)    (vorbis_info_residue *);
     94   void (*free_look)    (vorbis_look_residue *);
     95   long **(*class)      (struct vorbis_block *,vorbis_look_residue *,
     96 			float **,int *,int);
     97   int  (*forward)      (struct vorbis_block *,vorbis_look_residue *,
     98 			float **,float **,int *,int,long **);
     99   int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
    100 			float **,int *,int);
    101 } vorbis_func_residue;
    102 
    103 typedef struct vorbis_info_residue0{
    104 /* block-partitioned VQ coded straight residue */
    105   long  begin;
    106   long  end;
    107 
    108   /* first stage (lossless partitioning) */
    109   int    grouping;         /* group n vectors per partition */
    110   int    partitions;       /* possible codebooks for a partition */
    111   int    groupbook;        /* huffbook for partitioning */
    112   int    secondstages[64]; /* expanded out to pointers in lookup */
    113   int    booklist[256];    /* list of second stage books */
    114 
    115   float  classmetric1[64];  
    116   float  classmetric2[64];  
    117 
    118 } vorbis_info_residue0;
    119 
    120 /* Mapping backend generic *****************************************/
    121 typedef struct{
    122   void                 (*pack)  (vorbis_info *,vorbis_info_mapping *,
    123 				 oggpack_buffer *);
    124   vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
    125   void (*free_info)    (vorbis_info_mapping *);
    126   int  (*forward)      (struct vorbis_block *vb);
    127   int  (*inverse)      (struct vorbis_block *vb,vorbis_info_mapping *);
    128 } vorbis_func_mapping;
    129 
    130 typedef struct vorbis_info_mapping0{
    131   int   submaps;  /* <= 16 */
    132   int   chmuxlist[256];   /* up to 256 channels in a Vorbis stream */
    133   
    134   int   floorsubmap[16];   /* [mux] submap to floors */
    135   int   residuesubmap[16]; /* [mux] submap to residue */
    136 
    137   int   coupling_steps;
    138   int   coupling_mag[256];
    139   int   coupling_ang[256];
    140 
    141 } vorbis_info_mapping0;
    142 
    143 #endif
    144 
    145