misc/libtremor/tremor/backends.h
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     1 /********************************************************************
       
     2  *                                                                  *
       
     3  * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
       
     4  *                                                                  *
       
     5  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
       
     6  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
       
     7  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
       
     8  *                                                                  *
       
     9  * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
       
    10  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
       
    11  *                                                                  *
       
    12  ********************************************************************
       
    13 
       
    14  function: backend and mapping structures
       
    15 
       
    16  ********************************************************************/
       
    17 
       
    18 /* this is exposed up here because we need it for static modes.
       
    19    Lookups for each backend aren't exposed because there's no reason
       
    20    to do so */
       
    21 
       
    22 #ifndef _vorbis_backend_h_
       
    23 #define _vorbis_backend_h_
       
    24 
       
    25 #include "codec_internal.h"
       
    26 
       
    27 /* this would all be simpler/shorter with templates, but.... */
       
    28 /* Transform backend generic *************************************/
       
    29 
       
    30 /* only mdct right now.  Flesh it out more if we ever transcend mdct
       
    31    in the transform domain */
       
    32 
       
    33 /* Floor backend generic *****************************************/
       
    34 typedef struct{
       
    35   vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
       
    36   vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
       
    37 				   vorbis_info_floor *);
       
    38   void (*free_info) (vorbis_info_floor *);
       
    39   void (*free_look) (vorbis_look_floor *);
       
    40   void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
       
    41   int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
       
    42 		     void *buffer,ogg_int32_t *);
       
    43 } vorbis_func_floor;
       
    44 
       
    45 typedef struct{
       
    46   int   order;
       
    47   long  rate;
       
    48   long  barkmap;
       
    49 
       
    50   int   ampbits;
       
    51   int   ampdB;
       
    52 
       
    53   int   numbooks; /* <= 16 */
       
    54   int   books[16];
       
    55 
       
    56 } vorbis_info_floor0;
       
    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 } vorbis_info_floor1;
       
    75 
       
    76 /* Residue backend generic *****************************************/
       
    77 typedef struct{
       
    78   vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
       
    79   vorbis_look_residue *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
       
    80 				 vorbis_info_residue *);
       
    81   void (*free_info)    (vorbis_info_residue *);
       
    82   void (*free_look)    (vorbis_look_residue *);
       
    83   int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
       
    84 			ogg_int32_t **,int *,int);
       
    85 } vorbis_func_residue;
       
    86 
       
    87 typedef struct vorbis_info_residue0{
       
    88 /* block-partitioned VQ coded straight residue */
       
    89   long  begin;
       
    90   long  end;
       
    91 
       
    92   /* first stage (lossless partitioning) */
       
    93   int    grouping;         /* group n vectors per partition */
       
    94   int    partitions;       /* possible codebooks for a partition */
       
    95   int    groupbook;        /* huffbook for partitioning */
       
    96   int    secondstages[64]; /* expanded out to pointers in lookup */
       
    97   int    booklist[256];    /* list of second stage books */
       
    98 } vorbis_info_residue0;
       
    99 
       
   100 /* Mapping backend generic *****************************************/
       
   101 typedef struct{
       
   102   vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
       
   103   vorbis_look_mapping *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
       
   104 				 vorbis_info_mapping *);
       
   105   void (*free_info)    (vorbis_info_mapping *);
       
   106   void (*free_look)    (vorbis_look_mapping *);
       
   107   int  (*inverse)      (struct vorbis_block *vb,vorbis_look_mapping *);
       
   108 } vorbis_func_mapping;
       
   109 
       
   110 typedef struct vorbis_info_mapping0{
       
   111   int   submaps;  /* <= 16 */
       
   112   int   chmuxlist[256];   /* up to 256 channels in a Vorbis stream */
       
   113 
       
   114   int   floorsubmap[16];   /* [mux] submap to floors */
       
   115   int   residuesubmap[16]; /* [mux] submap to residue */
       
   116 
       
   117   int   psy[2]; /* by blocktype; impulse/padding for short,
       
   118                    transition/normal for long */
       
   119 
       
   120   int   coupling_steps;
       
   121   int   coupling_mag[256];
       
   122   int   coupling_ang[256];
       
   123 } vorbis_info_mapping0;
       
   124 
       
   125 #endif
       
   126 
       
   127 
       
   128 
       
   129 
       
   130