michael@0: /********************************************************************
michael@0:  *                                                                  *
michael@0:  * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
michael@0:  *                                                                  *
michael@0:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
michael@0:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
michael@0:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
michael@0:  *                                                                  *
michael@0:  * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
michael@0:  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
michael@0:  *                                                                  *
michael@0:  ********************************************************************
michael@0: 
michael@0:  function: backend and mapping structures
michael@0: 
michael@0:  ********************************************************************/
michael@0: 
michael@0: /* this is exposed up here because we need it for static modes.
michael@0:    Lookups for each backend aren't exposed because there's no reason
michael@0:    to do so */
michael@0: 
michael@0: #ifndef _vorbis_backend_h_
michael@0: #define _vorbis_backend_h_
michael@0: 
michael@0: #include "codec_internal.h"
michael@0: 
michael@0: /* this would all be simpler/shorter with templates, but.... */
michael@0: /* Transform backend generic *************************************/
michael@0: 
michael@0: /* only mdct right now.  Flesh it out more if we ever transcend mdct
michael@0:    in the transform domain */
michael@0: 
michael@0: /* Floor backend generic *****************************************/
michael@0: typedef struct{
michael@0:   vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
michael@0:   vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
michael@0: 				   vorbis_info_floor *);
michael@0:   void (*free_info) (vorbis_info_floor *);
michael@0:   void (*free_look) (vorbis_look_floor *);
michael@0:   void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
michael@0:   int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
michael@0: 		     void *buffer,ogg_int32_t *);
michael@0: } vorbis_func_floor;
michael@0: 
michael@0: typedef struct{
michael@0:   int   order;
michael@0:   long  rate;
michael@0:   long  barkmap;
michael@0: 
michael@0:   int   ampbits;
michael@0:   int   ampdB;
michael@0: 
michael@0:   int   numbooks; /* <= 16 */
michael@0:   int   books[16];
michael@0: 
michael@0: } vorbis_info_floor0;
michael@0: 
michael@0: #define VIF_POSIT 63
michael@0: #define VIF_CLASS 16
michael@0: #define VIF_PARTS 31
michael@0: typedef struct{
michael@0:   int   partitions;                /* 0 to 31 */
michael@0:   int   partitionclass[VIF_PARTS]; /* 0 to 15 */
michael@0: 
michael@0:   int   class_dim[VIF_CLASS];        /* 1 to 8 */
michael@0:   int   class_subs[VIF_CLASS];       /* 0,1,2,3 (bits: 1<<n poss) */
michael@0:   int   class_book[VIF_CLASS];       /* subs ^ dim entries */
michael@0:   int   class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
michael@0: 
michael@0: 
michael@0:   int   mult;                      /* 1 2 3 or 4 */ 
michael@0:   int   postlist[VIF_POSIT+2];    /* first two implicit */ 
michael@0: 
michael@0: } vorbis_info_floor1;
michael@0: 
michael@0: /* Residue backend generic *****************************************/
michael@0: typedef struct{
michael@0:   vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
michael@0:   vorbis_look_residue *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
michael@0: 				 vorbis_info_residue *);
michael@0:   void (*free_info)    (vorbis_info_residue *);
michael@0:   void (*free_look)    (vorbis_look_residue *);
michael@0:   int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
michael@0: 			ogg_int32_t **,int *,int);
michael@0: } vorbis_func_residue;
michael@0: 
michael@0: typedef struct vorbis_info_residue0{
michael@0: /* block-partitioned VQ coded straight residue */
michael@0:   long  begin;
michael@0:   long  end;
michael@0: 
michael@0:   /* first stage (lossless partitioning) */
michael@0:   int    grouping;         /* group n vectors per partition */
michael@0:   int    partitions;       /* possible codebooks for a partition */
michael@0:   int    partvals;         /* partitions ^ groupbook dim */
michael@0:   int    groupbook;        /* huffbook for partitioning */
michael@0:   int    secondstages[64]; /* expanded out to pointers in lookup */
michael@0:   int    booklist[512];    /* list of second stage books */
michael@0: } vorbis_info_residue0;
michael@0: 
michael@0: /* Mapping backend generic *****************************************/
michael@0: typedef struct{
michael@0:   vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
michael@0:   vorbis_look_mapping *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
michael@0: 				 vorbis_info_mapping *);
michael@0:   void (*free_info)    (vorbis_info_mapping *);
michael@0:   void (*free_look)    (vorbis_look_mapping *);
michael@0:   int  (*inverse)      (struct vorbis_block *vb,vorbis_look_mapping *);
michael@0: } vorbis_func_mapping;
michael@0: 
michael@0: typedef struct vorbis_info_mapping0{
michael@0:   int   submaps;  /* <= 16 */
michael@0:   int   chmuxlist[256];   /* up to 256 channels in a Vorbis stream */
michael@0:   
michael@0:   int   floorsubmap[16];   /* [mux] submap to floors */
michael@0:   int   residuesubmap[16]; /* [mux] submap to residue */
michael@0: 
michael@0:   int   psy[2]; /* by blocktype; impulse/padding for short,
michael@0:                    transition/normal for long */
michael@0: 
michael@0:   int   coupling_steps;
michael@0:   int   coupling_mag[256];
michael@0:   int   coupling_ang[256];
michael@0: } vorbis_info_mapping0;
michael@0: 
michael@0: #endif
michael@0: 
michael@0: 
michael@0: 
michael@0: 
michael@0: