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  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
  144.