release/src/router/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 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 16227 2009-07-08 06:58:46Z xiphmont $
  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)      (oggpack_buffer *,struct vorbis_block *,
  98                         vorbis_look_residue *,
  99                         float **,float **,int *,int,long **);
 100   int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
 101                         float **,int *,int);
 102 } vorbis_func_residue;
 103
 104 typedef struct vorbis_info_residue0{
 105 /* block-partitioned VQ coded straight residue */
 106   long  begin;
 107   long  end;
 108
 109   /* first stage (lossless partitioning) */
 110   int    grouping;         /* group n vectors per partition */
 111   int    partitions;       /* possible codebooks for a partition */
 112   int    groupbook;        /* huffbook for partitioning */
 113   int    secondstages[64]; /* expanded out to pointers in lookup */
 114   int    booklist[256];    /* list of second stage books */
 115
 116   const float classmetric1[64];
 117   const float 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