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/********************************************************************
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 *                                                                  *
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 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
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 *                                                                  *
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 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
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 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
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 *                                                                  *
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 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
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 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
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 *                                                                  *
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 ********************************************************************
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 function: backend and mapping structures
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 ********************************************************************/
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/* this is exposed up here because we need it for static modes.
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   Lookups for each backend aren't exposed because there's no reason
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   to do so */
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#ifndef _vorbis_backend_h_
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#define _vorbis_backend_h_
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#include "codec_internal.h"
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/* this would all be simpler/shorter with templates, but.... */
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/* Transform backend generic *************************************/
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/* only mdct right now.  Flesh it out more if we ever transcend mdct
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   in the transform domain */
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/* Floor backend generic *****************************************/
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typedef struct{
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  vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
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  vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
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                                   vorbis_info_floor *);
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  void (*free_info) (vorbis_info_floor *);
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  void (*free_look) (vorbis_look_floor *);
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  void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
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  int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
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                     void *buffer,ogg_int32_t *);
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} vorbis_func_floor;
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typedef struct{
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  int   order;
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  long  rate;
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  long  barkmap;
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  int   ampbits;
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  int   ampdB;
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  int   numbooks; /* <= 16 */
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  int   books[16];
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} vorbis_info_floor0;
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#define VIF_POSIT 63
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#define VIF_CLASS 16
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#define VIF_PARTS 31
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typedef struct{
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  int   partitions;                /* 0 to 31 */
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  int   partitionclass[VIF_PARTS]; /* 0 to 15 */
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  int   class_dim[VIF_CLASS];        /* 1 to 8 */
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  int   class_subs[VIF_CLASS];       /* 0,1,2,3 (bits: 1<<n poss) */
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  int   class_book[VIF_CLASS];       /* subs ^ dim entries */
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  int   class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
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  int   mult;                      /* 1 2 3 or 4 */
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  int   postlist[VIF_POSIT+2];    /* first two implicit */
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} vorbis_info_floor1;
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/* Residue backend generic *****************************************/
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typedef struct{
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  vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
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  vorbis_look_residue *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
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                                 vorbis_info_residue *);
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  void (*free_info)    (vorbis_info_residue *);
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  void (*free_look)    (vorbis_look_residue *);
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  int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
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                        ogg_int32_t **,int *,int);
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} vorbis_func_residue;
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typedef struct vorbis_info_residue0{
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/* block-partitioned VQ coded straight residue */
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  long  begin;
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  long  end;
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  /* first stage (lossless partitioning) */
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  int    grouping;         /* group n vectors per partition */
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  int    partitions;       /* possible codebooks for a partition */
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  int    groupbook;        /* huffbook for partitioning */
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  int    secondstages[64]; /* expanded out to pointers in lookup */
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  int    booklist[256];    /* list of second stage books */
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} vorbis_info_residue0;
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/* Mapping backend generic *****************************************/
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typedef struct{
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  vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
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  vorbis_look_mapping *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
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                                 vorbis_info_mapping *);
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  void (*free_info)    (vorbis_info_mapping *);
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  void (*free_look)    (vorbis_look_mapping *);
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  int  (*inverse)      (struct vorbis_block *vb,vorbis_look_mapping *);
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} vorbis_func_mapping;
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typedef struct vorbis_info_mapping0{
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  int   submaps;  /* <= 16 */
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  int   chmuxlist[256];   /* up to 256 channels in a Vorbis stream */
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  int   floorsubmap[16];   /* [mux] submap to floors */
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  int   residuesubmap[16]; /* [mux] submap to residue */
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  int   psy[2]; /* by blocktype; impulse/padding for short,
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                   transition/normal for long */
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  int   coupling_steps;
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  int   coupling_mag[256];
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  int   coupling_ang[256];
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} vorbis_info_mapping0;
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#endif
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