media/libvorbis/lib/backends.h

   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 1994-2009             *
   9  * by the Xiph.Org Foundation https://xiph.org/                     *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: libvorbis backend and mapping structures; needed for
  14            static mode headers
  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 /* Floor backend generic *****************************************/
  29 typedef struct{
  30   void                   (*pack)  (vorbis_info_floor *,oggpack_buffer *);
  31   vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
  32   vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_floor *);
  33   void (*free_info) (vorbis_info_floor *);
  34   void (*free_look) (vorbis_look_floor *);
  35   void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
  36   int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
  37                      void *buffer,float *);
  38 } vorbis_func_floor;
  39
  40 typedef struct{
  41   int   order;
  42   long  rate;
  43   long  barkmap;
  44
  45   int   ampbits;
  46   int   ampdB;
  47
  48   int   numbooks; /* <= 16 */
  49   int   books[16];
  50
  51   float lessthan;     /* encode-only config setting hacks for libvorbis */
  52   float greaterthan;  /* encode-only config setting hacks for libvorbis */
  53
  54 } vorbis_info_floor0;
  55
  56
  57 #define VIF_POSIT 63
  58 #define VIF_CLASS 16
  59 #define VIF_PARTS 31
  60 typedef struct{
  61   int   partitions;                /* 0 to 31 */
  62   int   partitionclass[VIF_PARTS]; /* 0 to 15 */
  63
  64   int   class_dim[VIF_CLASS];        /* 1 to 8 */
  65   int   class_subs[VIF_CLASS];       /* 0,1,2,3 (bits: 1<<n poss) */
  66   int   class_book[VIF_CLASS];       /* subs ^ dim entries */
  67   int   class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
  68
  69
  70   int   mult;                      /* 1 2 3 or 4 */
  71   int   postlist[VIF_POSIT+2];    /* first two implicit */
  72
  73
  74   /* encode side analysis parameters */
  75   float maxover;
  76   float maxunder;
  77   float maxerr;
  78
  79   float twofitweight;
  80   float twofitatten;
  81
  82   int   n;
  83
  84 } vorbis_info_floor1;
  85
  86 /* Residue backend generic *****************************************/
  87 typedef struct{
  88   void                 (*pack)  (vorbis_info_residue *,oggpack_buffer *);
  89   vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
  90   vorbis_look_residue *(*look)  (vorbis_dsp_state *,
  91                                  vorbis_info_residue *);
  92   void (*free_info)    (vorbis_info_residue *);
  93   void (*free_look)    (vorbis_look_residue *);
  94   long **(*class)      (struct vorbis_block *,vorbis_look_residue *,
  95                         int **,int *,int);
  96   int  (*forward)      (oggpack_buffer *,struct vorbis_block *,
  97                         vorbis_look_residue *,
  98                         int **,int *,int,long **,int);
  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    partvals;         /* partitions ^ groupbook dim */
 112   int    groupbook;        /* huffbook for partitioning */
 113   int    secondstages[64]; /* expanded out to pointers in lookup */
 114   int    booklist[512];    /* list of second stage books */
 115
 116   const int classmetric1[64];
 117   const int classmetric2[64];
 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